JP2018083079A - Compact-structure magnetically conductive coating layer, method of manufacturing compact-structure magnetically conductive coating layer, pot body, and cooking appliance - Google Patents

Abstract

Disclosed are a method for producing a magnetically conductive coating layer having a dense structure in which the coupling force and electromagnetic heating power of the magnetically conductive coating layer are improved, and a pan body and a cooking utensil including the magnetically conductive coating layer. With respect to a magnetically conductive coating layer 2 having a dense structure, the magnetically conductive coating layer is coated on the surface of a substrate as a layered coating layer on a pan body 1 and made by a cold spray process. The porosity is 0.05 to 0.25%. The magnetic conductive coating layer has the characteristics of high density, strong bonding strength, and hardly peels off, and has a porosity of 0.05 to 0.25%. It has a beneficial effect of improving. [Selection] Figure 1

Description

  The present invention relates to the technical field of pans, and more particularly to a magnetically conductive coating layer having a dense structure and a method for producing the same.

  Although materials such as aluminum alloy and 304 stainless steel are very widely used in home appliances, the electromagnetic heating function provided in these non-magnetic or weakly conductive pans is not ideal. For example, an IH heating pressure cooker or a frying pan made of aluminum adopts a method of partial heating brazing or caulking joining in a conventional process, and a bottom layer of a base pan is made of a conductive layer. A 430 stainless steel sheet is provided. However, these two types of processes cannot solve the problem of the stainless steel composite bottom plate at the high part of the pan, and its electromagnetic heating power is relatively small. In particular, in the latter caulking joining manufacturing technique, when performing the process of superimposing an iron plate (or 430 stainless steel) on the bottom of an aluminum pan, it is necessary to make a plurality of holes in the iron plate (or 430 stainless steel). However, this reduces the density of the material, reduces the density at which the magnetic flux lines are cut, reduces the eddy current effect of the electromagnetic heating, and reduces the heating power accordingly. This problem can be effectively solved by producing a dense magnetically conductive coating layer on the bottom of the pan.

  In order to achieve a good electromagnetic heating effect, a cold spray technique is employed to provide a highly dense magnetic conductive coating layer at the bottom of these pans. Fine powders such as Fe, Ni, Co, Fe-Si alloy, 430 stainless steel, etc. are used as raw materials, and the process parameters of cold spray are controlled to form a magnetically conductive coating layer having a dense structure with a low porosity (0.05 to 0). .5%) can significantly improve the electromagnetic heating efficiency of nonmagnetic or weakly magnetic pans (maximum output power reaches 1600 to 2000 W).

  The performance of the magnetically conductive coating layer produced on the bottom of the aluminum pan by the cold spray technology is clearly superior to that of the magnetically conductive coating layer produced by thermal spraying, and the current aluminum alloy / stainless steel composite bottom plate, or aluminum alloy Can replace pots or some cooking utensils made of stainless steel composite plates, reach the goal of rapidly and efficiently electromagnetic heating, significantly reducing the cost of manufacturing small household appliances with IH heating . Here, IH is an abbreviation for Induction Heating, and refers to using Joule heat generated when a secondary current (eddy current) due to electromagnetic induction passes through a material to be heated.

  In view of the problems existing in the prior art, the technical problem to be solved by the present invention is to provide a magnetic conductive coating layer having a dense structure, which is a process parameter of cold spray technology. Is obtained by strict control, and is dense, difficult to peel off, stable in performance, and can be mass-produced stably. Another technical problem to be solved by the present invention is to provide a method for producing a magnetically conductive coating layer having the above-mentioned dense structure. Another technical problem to be solved by the present invention is to provide a pan body and pans having a magnetically conductive coating layer having the above-described dense structure, and the pans have a good electromagnetic heating effect. Have.

  Technical solutions for solving the above technical problems of the present invention are as follows. A magnetically conductive coating layer having a dense structure that is coated on the surface of a substrate as a layered coating layer, wherein the magnetically conductive coating layer is formed by a cold spray process, and the porosity of the magnetically conductive coating layer is 0. Provided is a magnetically conductive coating layer having a dense structure of 0.5 to 0.25%.

  Preferably, the thickness of the magnetically conductive coating layer is 0.1 to 0.6 mm.

  Cold spray (CS: Cold Spray) is also called gas-powered spray technology. After high-speed solid-phase particles having a certain plasticity collide with a substrate, deposition occurs through intense plastic deformation, and a magnetic coating layer is formed. Refers to the method of forming. Under normal conditions, the general concept is that after the solid phase particles collide with some substrate, the solid phase particles ablate against the substrate.

  The beneficial effect of the present invention is that the magnetically conductive coating layer has a high density, a strong bonding force, and is difficult to peel off, and has a porosity of 0.05 to 0.25%. Has the beneficial effect of improving the cohesive strength and electromagnetic heating power of the coating layer, and below this range causes the problem that the process is difficult to perform, and above this range, the coupling of the magnetic coating layer Cause the problem of reduced power and electromagnetic heating power.

  Further, the magnetically conductive coating layer is a coating layer formed by cold spraying the surface of a structure on which a conductive metal powder is spray-coated with a working gas.

  Furthermore, the working gas is one or more of air, helium gas, and nitrogen gas.

  Further, the magnetic conductive metal is a mixture of one or more selected from Fe, Ni, Co, Fe-Si and stainless steel.

  The beneficial effect of adopting the above technical solution is that Fe, Ni, Co, Fe-Si and stainless steel each have the property of good magnetic conductivity, and the magnetic conductive coating manufactured with these powders. The layer has a good electromagnetic heating effect.

  Furthermore, the particle size of the magnetic conductive metal powder is 1 to 50 μm.

  The beneficial effect of adopting the above technical solution is that the use of a conductive metal powder having a relatively small particle size is advantageous in improving the compactness and bonding strength of the magnetic coating layer. If it is too large, the surface of the magnetically conductive coating layer tends to be rough, and problems such as poor density of the magnetically conductive coating layer tend to occur.

  In the present invention, a technical solution for solving the other technical problem is as follows. Provided is a method of manufacturing a dense structure of a magnetically conductive coating layer, which includes a step of cold spraying a surface of a structure to be coated with a powder of a conductive metal with a working gas.

  Furthermore, the working gas is one or more of air, helium gas, and nitrogen gas.

  The beneficial effect of adopting the above technical solution is that air, helium gas, and nitrogen gas each have characteristics as a protective atmosphere, and in the manufacturing process of the magnetic coating layer, the powder of the base material of the magnetic coating layer It has the effect of protecting so as not to be oxidized in large quantities.

  Furthermore, the spray pressure of the cold spray is 1 to 3.5 Mpa.

  The beneficial effect of adopting the above technical solution is that the above pressure is advantageous to ensure that the magnetically conductive coating layer has a good bonding force, and if the pressure is too high, it is sprayed later. The powder is difficult to deposit and the thickness of the magnetically conductive coating layer cannot be increased. If the pressure is too low, the speed of the metal powder will be lower than the critical deposition speed, and will always be difficult to deposit on the surface of the substrate. cause.

  Furthermore, the spray temperature of the cold spray is 573 to 1273K.

  The beneficial effect of adopting the above technical solution is that the use of the above temperature is advantageous in improving the density and bonding force of the magnetically conductive coating layer. If the temperature is too high, the spray gun can be used over a long period of time. If the temperature is too low, problems such as poor bonding strength and denseness of the magnetically conductive coating layer may occur.

Furthermore, the gas velocity of the cold spray is 1 to 2.4 m ³ / min.

  The beneficial effect of adopting the above technical solution is that adopting the gas velocity is advantageous to ensure that the powder particles have a sufficient velocity (slightly higher than the deposition critical velocity), and the powder is effective Can be deposited. If the gas velocity is too high, the flying speed of the particles will be too high, and the existing magnetic conductive coating layer will be ablated, causing a problem that it is difficult to deposit the magnetic conductive coating layer later. If the gas velocity is too low, the flying speed of the powder particles becomes low, causing a problem that the powder is difficult to be deposited on the surface of the pan body.

  Furthermore, the conveyance speed of the magnetic powder of the cold spray is 5 to 15 kg / h.

  The beneficial effect of adopting the above technical solution is that the use of the transport speed is advantageous in improving the effective deposition rate of the powder, and if the transport speed is too high, the average flight speed of the powder is reduced, When the conveyance speed is too low, the effective deposition rate of the powder is lowered.

  Furthermore, the spray distance of the cold spray is 10 to 50 mm.

  The beneficial effect of adopting the above technical solution is that the use of the spray distance is advantageous in improving the deposition efficiency of the magnetically conductive coating layer. If the spray distance is too long, the particles fly to the surface of the substrate. If the spraying distance is too low, the speed when the particles fly to the surface of the substrate is too high, causing the problem that the speed when reaching the surface is too low, and the speed is too high. The layer is ablated, causing the problem that the later magnetically conductive coating layer is thick and difficult to deposit.

  Furthermore, the power consumption of the cold spray is 15 to 55 kW.

  The beneficial effect of adopting the above technical solution is that, if the above power consumption is adopted, it is advantageous to effectively heat the protective gas, and the hot protective gas has good preheating to the powder. , The powder can reach the proper spray temperature. If the power consumption is too high, the gas temperature is too high, causing problems such as damage to the nozzle seal ring. If the power consumption is too low, the protective gas heating temperature is relatively low and the powder preheating temperature is low. Is insufficient, causing problems such as poor bonding strength of the magnetic conductive coating layer.

  Further, the magnetic conductive metal is a mixture of one or more selected from Fe, Ni, Co, Fe-Si and stainless steel.

  The beneficial effect of adopting the above technical solution is that Fe, Ni, Co, Fe-Si and stainless steel each have the property of good magnetic conductivity, and the magnetic conductivity produced with these powders. The coating layer has a good electromagnetic heating effect.

  Furthermore, the particle size of the magnetic conductive metal powder is 1 to 50 μm.

  The beneficial effect of adopting the above technical plan is that the use of a conductive metal powder having a relatively small particle size is advantageous in improving the density and bonding strength of the magnetic conductive coating layer, and the particle size of the powder is too high. This tends to cause problems such as a rough surface of the magnetically conductive coating layer and poor density of the magnetically conductive coating layer.

  Furthermore, the thickness of the magnetically conductive coating layer is 0.1 to 0.6 mm.

  The beneficial effect of adopting the above technical plan is that when the thickness of the magnetically conductive coating layer is 0.1 to 0.6 mm, the magnetically conductive coating layer has a good electromagnetic heating effect and improves production efficiency. If the thickness is too high, it will cause problems such as reduced production efficiency.If the thickness is too low, the electromagnetic heating power of the magnetically conductive coating layer will be reduced. cause.

  The present invention is a pan body including a pan body and a magnetically conductive coating layer having the above-described dense structure, wherein the magnetically conductive coating layer is located on the outer surface of the pan body and is a lower portion of the side wall of the pan body. And / or providing a pan located at the bottom.

  Furthermore, the material of the pan body is one or more of aluminum alloy, stainless steel, high strength ceramics and high strength glass.

  The beneficial effect of adopting the above technical plan is that aluminum alloy, stainless steel, high-strength ceramics, and high-strength glass have non-magnetic properties or weak magnetic properties, respectively. After producing the coating layer, all have a good electromagnetic heating effect.

  The present invention provides a cooking utensil including an electromagnetic induction coil and the pan, and the electromagnetic induction coil is installed corresponding to the magnetic conductive coating layer. The cooking utensils may be pots, but are not limited to pots.

  Further, the projection of the electromagnetic induction coil onto the pan body is used as a projection region, the projection region is located in the magnetic conductive coating layer, and the peripheral edge of the projection region is from the peripheral edge of the magnetic conductive coating layer. 1 mm or more away.

  Further, the distance between the electromagnetic induction coil and the outer surface of the magnetic conductive coating layer is less than 10 mm.

  The beneficial effect of adopting the above technical solution is that the pots themselves have a relatively high strength, and a magnetically conductive coating layer can be effectively sprayed and deposited on the surface thereof. The layer characteristics ensure a good electromagnetic heating effect.

FIG. 1 is a schematic structural diagram of a part of the present invention. FIG. 2 shows the result of detecting the porosity of Example 2.

  Hereinafter, the principle and features of the present invention will be described in accordance with specific embodiments. These examples are used only to interpret the present invention and are not intended to limit the scope of the invention.

  The present invention is a magnetic conductive coating layer having a dense structure already coated on the surface of a substrate as a layered coating layer, and the magnetic conductive coating layer is made by a cold spray process, and the porosity of the magnetic coating layer Is 0.05 to 0.25%. Preferably, the thickness of the magnetically conductive coating layer is 0.1 to 0.6 mm.

  The present invention further discloses a method of manufacturing a dense structure of the magnetically conductive coating layer, which includes cold spraying the surface of the structure to be spray coated with the conductive metal powder with a working gas.

The working gas is one or more of air, helium gas, and nitrogen gas. The spray pressure of the cold spray is 1 to 3.5 Mpa. The spray temperature of the cold spray is 573 to 1273K. The gas velocity of the cold spray is 1 to 2.4 m ³ / min. The conveyance speed of the magnetic powder of the cold spray is 5 to 15 kg / h. The spray distance of the cold spray is 10 to 50 mm. The power consumption of the cold spray is 15 to 55 kW. The magnetic conductive metal is a mixture of one or more selected from Fe, Ni, Co, Fe-Si and stainless steel. The particle size of the magnetic conductive metal powder is 1 to 50 μm. The magnetic conductive coating layer has a thickness of 0.1 to 0.6 mm.

Further, the process conditions may be as follows. The working gas is one or more of air, helium gas, and nitrogen gas. The spray pressure of the cold spray is 1.8 to 2.5 Mpa. The spray temperature of the cold spray is 1173 to 1273K. The gas velocity of the cold spray is 1.6 to 2.4 m ³ / min. The conveyance speed of the magnetic powder of the cold spray is 7 to 10 kg / h. The spray distance of the cold spray is 20 to 40 mm. The power consumption of the cold spray is 20-50 kW. The magnetic conductive metal is a mixture of one or more selected from Fe, Ni, Co, Fe-Si and stainless steel. The particle size of the magnetic conductive metal powder is 10 to 40 μm. The thickness of the magnetic conductive coating layer is 0.15 to 0.4 mm. The porosity of the magnetically conductive coating layer is 0.1 to 0.24%.

  In the pan body including the pan body and the magnetically conductive coating layer, the magnetically conductive coating layer is located on the outer surface of the pan body, and is located on the bottom and bottom of the side wall of the pan body. The material of the pan body is one or more of aluminum alloy, stainless steel, high strength ceramics and high strength glass.

  When manufacturing the pan body, the base body can be pretreated on the outer surface of the pan body, and the base body pretreatment method can be used to remove impurities from the outer surface of the base body of the pan body. An oil degreasing process is performed. Optionally, a sandblasting process is performed on the surface of the base material of the pan body on which the spray coating is performed before the substrate pretreatment.

  In the cooking utensil including the electromagnetic induction coil and the pan body, the electromagnetic induction coil is installed corresponding to the magnetic conductive coating layer.

  Projection of the electromagnetic induction coil onto the pan is a projection region, the projection region is located in the magnetically conductive coating layer, and the peripheral edge of the projected region is 1 mm or more from the peripheral edge of the magnetically conductive coating layer. is seperated. The distance between the electromagnetic induction coil and the outer surface of the magnetic conductive coating layer is less than 10 mm.

  Hereinafter, a specific example will be specifically described.

  A cold spray system is used to accelerate the magnetically conductive metal powder to a critical speed by compressing air. The magnetic conductive metal powder is ejected through a nozzle, and after being hit directly on the outer surface of the pan body, physical deformation occurs. The magnetic conductive metal powder collides with the outer surface of the pot body and is crushed and firmly adhered to form a magnetic conductive layer having a very dense layer and imparts magnetic conductivity to the pans.

  FIG. 1 in the drawings is a selection diagram, and as shown in FIG. 1, FIG. 1 is a schematic structural diagram of a part of a pan including a cold spray magnetic coating layer of the present invention. The magnetic conductive coating layer 2 is spray coated on the bottom of the pan body 1 or on the bottom and the arcuate rising portion. The pot body 1 and the magnetically conductive coating layer 2 are mainly bonded by a mechanical bonding method, and both constitute a pot / cooking utensil capable of electromagnetic heating.

Example 1
The pot body includes a pot body and a magnetically conductive coating layer, and the magnetically conductive coating layer is located on the outer surface of the pot body. The material of the pan body is an aluminum alloy.

Manufacturing a magnetically conductive coating layer on the pan body using a cold spray process includes the following steps. 1. Degreasing and degreasing treatment was performed on the surface of the outer surface of the pan body to be spray coated. 2. The conductive metal powder was cold sprayed on the outer surface of the pan body with the working gas, and the conductive metal powder formed a magnetic coating layer on the surface of the pan body. Specific process parameters are as follows. (1) Fe powder having a purity of 99.0 to 99.8% is adopted as the magnetic conductive powder, the particle size of the powder is 10 to 20 μm, the working gas is high purity nitrogen gas, and nitrogen gas is used. Has a purity of 99.99%, a spray distance of 25 to 30 mm, a spray temperature (ie, gas heating temperature) of 1223 to 1273 K, a power consumption of 20 to 35 kW, and the conveying speed of the magnetic conductive powder is It is 7-8 kg / h, the injection pressure is 1.8-2.0 Mpa, and the gas velocity is 1.6-1.8 m ³ / min. (2) The thickness of the manufactured magnetically conductive coating layer is 0.15 to 0.2 mm, and the porosity is 0.14 to 0.16%. The electromagnetic heating maximum power of the pots to which the pot body is attached reached 1800W.

Example 2
The pot body includes a pot body and a magnetically conductive coating layer, and the magnetically conductive coating layer is located on the outer surface of the pot body. The material of the pan body is 304 stainless steel.

Manufacturing a magnetically conductive coating layer on the pan body using a cold spray process includes the following steps. 1. The position where spray coating on the outer surface of the pan body does not need to be performed was shielded with a shielding jig. 2. The conductive metal powder was cold sprayed on the surface of the pan body with the working gas, and the conductive metal powder formed a magnetic coating layer on the surface of the pan body. Specific process parameters are as follows. (1) Fe powder having a purity of 99.0 to 99.8% is adopted as the magnetic conductive powder, the particle size of the powder is 10 to 20 μm, the working gas is high purity nitrogen gas, and nitrogen gas is used. Is 99.99%, spray distance is 25-30 mm, spray temperature (ie gas heating temperature) is 1173-1223K, power consumption is 25-30 kW, and the conveying speed of the magnetic powder is It is 8-9 kg / h, the injection pressure is 2-2.1 Mpa, and the gas velocity is 1.8-2.0 m ³ / min. (2) The manufactured magnetic conductive coating layer has a thickness of 0.3 to 0.4 mm and a porosity of 0.10 to 0.12%. The maximum electromagnetic heating power of the pans to which the pan body is attached reached 1840W.

Example 3
The pot body includes a pot body and a magnetically conductive coating layer, and the magnetically conductive coating layer is located on the outer surface of the pot body. The material of the pan body is an aluminum alloy.

  Manufacturing a magnetically conductive coating layer on the pan body using a cold spray process includes the following steps.

1. The position where spray coating on the outer surface of the pan body does not need to be performed was shielded with a shielding jig. The pan body is an inner pot of aluminum alloy. 2. The conductive metal powder was cold sprayed on the surface of the pan body with the working gas, and the conductive metal powder formed a magnetic coating layer on the surface of the pan body. Specific process parameters are as follows. (1) Fe-Si alloy powder having a purity of 99.0 to 99.5% is used for the magnetic conductive powder, the particle size of the powder is 20 to 40 μm, and the working gas is high-purity nitrogen gas. The purity of the nitrogen gas is 99.99%, the spray distance is 25 to 40 mm, the spray temperature (that is, the gas heating temperature) is 1173 to 1223 K, the power consumption is 25 to 30 kW, The conveyance speed is 7 to 9 kg / h, the injection pressure is 1.8 to 2.1 Mpa, and the gas speed is 1.8 to 2.0 m ³ / min. (2) The thickness of the manufactured magnetically conductive coating layer is 0.2 to 0.3 mm, and the porosity is 0.15 to 0.18%. The maximum electromagnetic heating power of the pans to which the pan body is attached reached 1780 W.

Example 4
The pot body includes a pot body and a magnetically conductive coating layer, and the magnetically conductive coating layer is located on the outer surface of the pot body. The material of the pan body is an aluminum alloy.

Manufacturing a magnetically conductive coating layer on the pan body using a cold spray process includes the following steps. 1. The position where spray coating on the outer surface of the pan body does not need to be performed was shielded with a shielding jig. The pan body is an inner pot of aluminum alloy. 2. The conductive metal powder was cold sprayed on the surface of the pan body with the working gas, and the conductive metal powder formed a magnetic coating layer on the surface of the pan body. Specific process parameters are as follows. (1) Ni powder having a purity of 99.0 to 99.5% is adopted as the magnetic conductive powder, the particle size of the powder is 20 to 40 μm, the working gas is high purity nitrogen gas, and nitrogen gas is used. The purity is 99.99%, the spray distance is 30 to 40 mm, the spray temperature (that is, the gas heating temperature) is 1223 to 1273 K, the power consumption is 30 to 50 kW, and the conveying speed of the magnetic conductive powder is The pressure is 8 to 10 kg / h, the injection pressure is 2.3 to 2.5 Mpa, and the gas velocity is 2.0 to 2.2 m ³ / min. (2) The thickness of the manufactured magnetically conductive coating layer is 0.3 to 0.4 mm, and the porosity is 0.15 to 0.18%. The maximum electric power for electromagnetic heating of the pans to which the pan body is attached reached 1750 W.

Example 5
The pot body includes a pot body and a magnetically conductive coating layer, and the magnetically conductive coating layer is located on the outer surface of the pot body. The material of the pan body is high boron glass.

Manufacturing a magnetically conductive coating layer on the pan body using a cold spray process includes the following steps. 1. The position where spray coating on the outer surface of the pan body does not need to be performed was shielded with a shielding jig. The pan body is an inner pan of high boron glass. 2. The conductive metal powder was cold sprayed on the surface of the pan body with the working gas, and the conductive metal powder formed a magnetic coating layer on the surface of the pan body. Specific process parameters are as follows. (1) The magnetic conductive powder employs an Fe alloy powder having a purity of 99.0 to 99.5%, the particle size of the powder is 20 to 40 μm, the working gas employs a high purity helium gas, and helium The purity of the gas is 99.9%, the spray distance is 25 to 40 mm, the spray temperature (that is, the gas heating temperature) is 1223 to 1273 K, the power consumption is 30 to 40 kW, and the conveying speed of the magnetic conductive powder. Is 7-9 kg / h, the injection pressure is 2.1-2.4 Mpa, and the gas velocity is 2.0-2.4 m ³ / min. (2) The thickness of the manufactured magnetically conductive coating layer is 0.2 to 0.3 mm, and the porosity is 0.18 to 0.2%. The maximum electromagnetic heating power of the pots to which the pot body is attached reached 1850 W.

Example 6
The pot body includes a pot body and a magnetically conductive coating layer, and the magnetically conductive coating layer is located on the outer surface of the pot body. The material of the pan body is high-strength alumina ceramics.

Manufacturing a magnetically conductive coating layer on the pan body using a cold spray process includes the following steps. 1. The position where spray coating on the outer surface of the pan body does not need to be performed was shielded with a shielding jig. The pan body is an inner pan of high-strength alumina ceramics. 2. The conductive metal powder was cold sprayed on the outer surface of the pan body with the working gas, and the conductive metal powder formed a magnetic coating layer on the surface of the pan body. Specific process parameters are as follows. (1) 430 stainless steel powder having a purity of 99.0 to 99.5% is used as the magnetic conductive powder, the particle size of the powder is 10 to 20 μm, and the working gas is high purity helium gas. The purity of helium gas is 99.9%, the spray distance is 25 to 40 mm, the spray temperature (that is, the gas heating temperature) is 1123 to 1173 K, the power consumption is 20 to 30 kW, The conveyance speed is 7 to 9 kg / h, the injection pressure is 1.8 to 2.0 Mpa, and the gas speed is 1.7 to 2.0 m ³ / min. (2) The manufactured magnetic conductive coating layer has a thickness of 0.2 to 0.3 mm and a porosity of 0.2 to 0.22%. The maximum electromagnetic heating power of the pan to which this pan is attached reached 1760W.

Example 7
The pot body includes a pot body and a magnetically conductive coating layer, and the magnetically conductive coating layer is located on the outer surface of the pot body. The material of the pan body is 304 stainless steel.

Manufacturing a magnetically conductive coating layer on the pan body using a cold spray process includes the following steps. 1. The position where spray coating on the outer surface of the pan body does not need to be performed was shielded with a shielding jig. The pan body is a 304 stainless steel inner pan. 2. The conductive metal powder was cold sprayed on the surface of the pan body with the working gas, and the conductive metal powder formed a magnetic coating layer on the surface of the pan body. Specific process parameters are as follows. (1) Ni powder having a purity of 99.0 to 99.5% is adopted as the magnetic conductive powder, the particle size of the powder is 10 to 40 μm, the working gas is a high purity nitrogen gas, and the nitrogen gas Has a purity of 99.99%, a spray distance of 20 to 40 mm, a spray temperature (ie, gas heating temperature) of 1173 to 1223 K, a power consumption of 20 to 35 kW, and the conveying speed of the magnetically conductive powder is It is 8-9 kg / h, the injection pressure is 2.1-2.4 Mpa, and the gas velocity is 2.0-2.1 m ³ / min. (2) The thickness of the manufactured magnetically conductive coating layer is 0.2 to 0.3 mm, and the porosity is 0.22 to 0.24%. The maximum electromagnetic heating power of the pans to which the pan body is attached reached 1780 W.

Comparative Example 1
Based on Example 1, the spray temperature (ie gas heating temperature) was changed to 423-573K. Other than that, all are the same as in the first embodiment.

Comparative Example 2
Based on Example 1, the spray temperature (ie gas heating temperature) was changed to 573-623K. Other than that, all are the same as in the first embodiment.

Comparative Example 3
Based on Example 1, the spray distance was changed to 40-50 mm. Other than that, all are the same as in the first embodiment.

Comparative Example 4
Based on Example 1, the spray distance was changed to 50-60 mm. Other than that, all are the same as in the first embodiment.

Comparative Example 5
Based on Example 1, the particle size of the powder was changed to 50-80 μm. Other than that, all are the same as in the first embodiment.

Comparative Example 6
Based on Example 1, the particle size of the powder was changed to 80-100 μm. Other than that, all are the same as in the first embodiment.

Comparative Example 7
Based on Example 1, the injection pressure was changed to 0.8 to 1.0 Mpa. Other than that, all are the same as in the first embodiment.

  For each example and each comparative example, the porosity, bonding force and electromagnetic heating power were detected.

  FIG. 2 shows the measurement results of the porosity of Example 2 of the present invention. The calculation method of the porosity is a percentage ratio between the area of the void and the area of the sample to be measured. As a result of the detection, the porosity is 0.12%, indicating that the coating layer has few voids, is very dense, and has good denseness.

  Table 1 shows the detection results of the porosity, coupling force, and electromagnetic heating power.

  As can be seen from the data in Table 1, a highly dense magnetic coating layer can be produced on the surface of non-magnetic material pans or cooking utensils by strictly controlling the process parameters of the cold spray. . The magnetic conductivity of the nonmagnetic material pots can be effectively realized, and the electromagnetic heating function of the weakly magnetic material pots can be improved. Further, this magnetic conductive coating layer has a strong bonding force. The raw material of the magnetic conductive coating layer is a fine powder such as Fe, Ni, Co, Fe-Si, 430 stainless steel having excellent magnetic conductivity. As a feature of the magnetically conductive coating layer, the porosity is preferably 0.1 to 0.25%.

  In the description of the present invention, the azimuth or positional relationship indicated by terms such as “top”, “bottom”, “inside”, and “outside” is based on the azimuth or positional relationship shown in the drawings. It is merely for purposes of explanation and is not intended to indicate or imply that the device or part has a particular orientation or needs to be constructed and operated in a particular orientation. It should not be understood as limiting the invention. Note that the terms “first” and “second” are used only to describe the purpose, and should not be understood to indicate or imply relative importance.

  The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the scope and spirit of the present invention are not limited. Should also be included within the protection scope of the present invention.

In the drawing, a list of members represented by each symbol is as follows.
1: Pan body 2: Magnetically conductive coating layer

The present invention relates to a technical field of pots, and particularly relates to a magnetic conductive coating layer having a dense structure, a method for manufacturing a magnetic conductive coating layer having a dense structure, a pot body, and a cooking utensil .

Technical solutions for solving the above technical problems of the present invention are as follows. A dense magnetic conductive coating layer coated on the surface of a substrate as a layered coating layer, wherein the porosity of the magnetic conductive coating layer is 0.05 to 0.25%. A magnetic coating layer is provided.

Claims (17)

A magnetically conductive coating layer having a dense structure coated on the surface of the substrate as a layered coating layer,
The magnetically conductive coating layer is made by a cold spray process, and the porosity of the magnetically conductive coating layer is 0.05 to 0.25%,
A magnetically conductive coating layer with a dense structure.   The dense magnetic conductive coating layer according to claim 1, wherein the magnetic conductive coating layer has a thickness of 0.1 to 0.6 mm.   The method of manufacturing a dense structure of the magnetically conductive coating layer according to claim 1, further comprising a step of cold spraying the surface of the structure to be spray coated with the powder of the magnetically conductive metal using a working gas.   The method for manufacturing a dense magnetic conductive coating layer according to claim 3, wherein the working gas is one or more of air, helium gas, and nitrogen gas.   The method for manufacturing a dense magnetic conductive coating layer according to claim 3, wherein an injection pressure of the cold spray is 1 to 3.5 Mpa.   4. The method of manufacturing a dense magnetic conductive coating layer according to claim 3, wherein an injection temperature of the cold spray is 573 to 1273 K. 5. The method of manufacturing a dense magnetic conductive coating layer according to claim 3, wherein a gas velocity of the cold spray is 1 to 2.4 m ³ / min.   The method of manufacturing a dense magnetically conductive coating layer according to claim 3, wherein a conveying speed of the magnetic powder of the cold spray is 5 to 15 kg / h.   The method for manufacturing a dense magnetic conductive coating layer according to claim 3, wherein a spray distance of the cold spray is 10 to 50 mm.   The method of claim 3, wherein the power consumption of the cold spray is 15 to 55 kW.   11. The magnetic conductive metal according to claim 3, wherein the magnetically conductive metal is a mixture of one or more selected from Fe, Ni, Co, Fe—Si, and stainless steel. A method for producing a magnetically conductive coating layer having a dense structure.   The method of manufacturing a dense magnetic conductive coating layer according to any one of claims 3 to 10, wherein a particle size of the magnetic conductive metal powder is 1 to 50 µm.   A pan body and the magnetically conductive coating layer according to claim 1, wherein the magnetically conductive coating layer is located on an outer surface of the pan body and located on a lower portion and / or a bottom portion of the side wall of the pan body. A pan body characterized by that.   The pot body according to claim 13, wherein the material of the pot body is one or more of aluminum alloy, stainless steel, high strength ceramics and high strength glass.   15. A cooking utensil comprising an electromagnetic induction coil and the pan according to claim 13 or 14, wherein the electromagnetic induction coil is installed corresponding to the magnetic conductive coating layer.   Projection of the electromagnetic induction coil onto the pan is a projection region, the projection region is located in the magnetically conductive coating layer, and the peripheral edge of the projected region is 1 mm or more from the peripheral edge of the magnetically conductive coating layer. 16. A cooking utensil according to claim 15, characterized in that it is separated.   The cooking utensil according to claim 15, wherein a distance between the electromagnetic induction coil and the outer surface of the magnetic conductive coating layer is less than 10 mm.