CN107009027A - The micro- texture of hair follicle type and its processing method of a kind of high bond strength - Google Patents

Abstract

The invention provides a hair follicle-type micro-texture with high bonding strength and a processing method thereof. A hair-follicle-type composite micro-topography with a narrow top and a wide bottom is processed on the surface of a base material, and the hair-follicle-type composite micro-topography is along the The up-and-down composite microtopography carried out in the direction of the side of the matrix material, including the hair root in the upper part as a columnar body, and the hair ball in the lower part as a spherical body. The inside of the hair ball includes several hair protrusions, and the diameter of the hair root is smaller than the hair The diameter of the ball. The hair follicle type micro-texture of the present invention has the characteristics and advantages that when the reinforcement is embedded in the micro-depression, the hair follicle structure will lock the formed part of the reinforcement, and the effective contact surface area between the matrix and the reinforcement will be formed at the same time. Interlocking in the structure, thereby improving the interface bonding strength of the composite material and the service life of the composite material. The parameters of the follicular microtexture can be adjusted according to the combination of different materials, effectively increasing the applicable occasions of the follicular microtexture.

Description

A hair follicle-type micro-texture with high binding strength and its processing method

technical field

The invention relates to surface treatment technology in the field of composite materials. Through laser micromachining and corrosive liquid microetching technology, a hair follicle-type micro-texture is formed on the surface of a composite material. Specifically, it relates to a hair-follicle-type microtexture with high bonding strength Textures and their processing methods.

Background technique

As a new multifunctional material, composite materials are widely used in aerospace, automobiles, large-scale storage and transportation, building materials, medical equipment and other fields.

At present, the main method to improve the interfacial bonding performance of materials is surface micro-texture treatment. The commonly used micro-texture morphology is divided into single micro-texture and composite micro-texture. Specifically, there are spiral (CN 104825212 A), circular arc Shape (CN105149894 A), crater type and spherical crown type (CN 104551701 A), etc., their common feature is that the micro-texture located on the surface of the material is in the shape of a semi-ellipsoid opening, that is, the diameter of the opening is greater than the diameter of the bottom. These traditional The opening-like micro-texture with a wide top and a narrow bottom mainly realizes the composite morphology through the lateral change of the material.

The disadvantage of this type of micro-texture is that matrix cracking, delamination, fiber fracture and matrix extrusion are prone to occur when the composite material is subjected to impact force, extrusion force, shear force, alternating force or composite force under working conditions. Such damage will reduce the service life of the material.

Contents of the invention

The purpose of the present invention is to provide a hair follicle-type micro-texture with high bonding strength and its processing method in view of the above problems, and form a hair-follicle-type micro-texture on the surface of the composite material through laser micromachining and corrosive liquid microetching composite technology , The reinforcement and the matrix material are interlocked through the embedding of the reinforcement material, which increases the effective bonding strength of the matrix and the reinforcement, and is applicable to most composite material bonding fields and most laminated composite material fields.

The technical solution of the present invention is: a hair follicle-type micro-texture with high bonding strength, and a hair-follicle-type composite micro-topography with a narrow top and a wide bottom is processed on the surface of the base material. The hair-follicle-type composite micro-topography is along the vertical The up-and-down composite microtopography in the direction of the side of the base material includes a columnar hair root at the upper part and a spherical hair bulb at the lower part. The diameter of the hairball.

In the above scheme, when the number of the hair protrusions is one, the hair protrusions and hair bulbs have the same structure, and the hair follicle microstructure is a single hair follicle microtexture;

When the number of the hairy protrusions is ≧2, the follicular microstructure is a multi-hairy follicular microstructure, and there is a distance between the hairy protrusions.

In the above scheme, the depth H≧5 μm of the hair root, the diameter D≧100 μm of the hair root, the depth H1≧5 μm of the hair bulb, and the diameter D1≧(1.1～2)D of the hair bulb.

In the above solution, the diameter d=(1˜1/5)D1 of the hair protrusion.

In the above scheme, the value of the pitch between the bumps is 0≦δ≦D1-2d.

In the above scheme, the hair follicle type composite microtopography exists on all or part of the surface of the matrix material, and the area occupancy of the hair follicle type composite microtopography is That is, the occupancy μ of the hair follicle type composite microtopography area is the surface area of the hair root The ratio of the square of the center-to-center distance L between adjacent hair roots.

A processing method according to the hair follicle type micro-texture with high bonding strength, comprising the following steps:

S1, roughening the surface of the base material;

S2. Design the surface follicle shape of the base material to be single-hair follicle or multi-hair follicle;

S3. Laser processing the hair roots and hair bulbs of the hair follicle microstructure on the surface of the matrix material, the hair roots and hair bulbs are distributed longitudinally, and the diameter of the hair roots is smaller than the diameter of the hair bulbs;

S4, using laser texturing technology to process the preliminary shape of the hairy protrusions in the hair ball, and then using corrosive liquid to laterally corrode the hairy protrusions;

S5, using a syringe to inject a corrosive cleaning solution to clean the hairy protrusions;

S6. Using a composite process to integrate or embed the reinforcement material into the follicle-shaped micro-pits of the matrix material, that is, the follicle-shaped micro-texture, to prepare a composite material.

In the above solution, the arithmetic mean deviation of the surface profile of the base material in the step S1 is Ra≦0.8 μm or Ra≦1.0 μm, and the maximum height of the profile is Rz≦1.6 μm or Rz≦3.2 μm.

In the above scheme, the specific laser processing parameters in the step S2 are: the laser wavelength for laser texturing is 532nm or 2×532nm, the defocus amount is [-1.2, 1.2]mm, the pulse width is 0.5ms, and the pulse frequency is 1KHz～10KHz, the energy density is 10 ⁴ ～10 ⁶ W/cm ² .

In the above solution, according to the use conditions of the composite material, the laser processing angle in the step S2 is 0°-45° to the normal direction of the surface of the base material.

Compared with prior art, the beneficial effect of the present invention is:

1. The hair follicle-type micro-texture described in the present invention can be applied to most fields of combining composite materials and most fields of laminated composite materials.

2. The hair follicle-type micro-texture of the present invention is a hair-follicle-type micro-texture that is narrow at the top and wide at the bottom. The composite shape is realized through longitudinal changes, and the hair bulb at the bottom of the hair-follicle-type micro-texture can be used to a large extent Increase the effective bonding area between the matrix and the reinforcement.

3. The hair follicle-type micro-texture of the present invention is a hair-follicle-type micro-texture whose top is narrow and bottom is wide, and the composite morphology is realized through longitudinal changes. The effective bonding strength of the matrix and the reinforcement is increased, thereby improving the interface bonding strength of the composite material and the service life of the composite material.

4. The parameters of the hair follicle-type micro-texture in the present invention can be adjusted according to the combination of different materials, effectively increasing the applicable occasions of the hair-follicle-type micro-texture.

Description of drawings

Fig. 1 is a schematic diagram of the morphology and structure of the single hair follicle type micro-texture according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the morphology and structure of the multi-hair follicle type micro-texture according to an embodiment of the present invention;

Fig. 3 is a dimensional labeling diagram of a single hair follicle type micro-texture according to an embodiment of the present invention;

Fig. 4 is a dimensioned diagram of a multi-hair follicle-type micro-texture according to an embodiment of the present invention;

Fig. 5 is a distribution diagram of the spacing of hair follicle-type micro-textures according to an embodiment of the present invention;

Fig. 6 is a processing flow chart of a single hair follicle type micro-texture according to an embodiment of the present invention;

Fig. 7 is a processing flow chart of the multi-hair follicle type micro-texture according to an embodiment of the present invention.

In the figure, 1-matrix material; 2-hair root; 3-hair ball; 4-hair convex; 5-hair convex distance.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

In order to illustrate the specific situation of the follicle-type micro-texture morphology and its processing method of the present invention, the following implementation of the metal-based skeleton and rubber composite of the laminated composite buffer strip is taken as an example, and the present invention will be further described in conjunction with the accompanying drawings. The process of the implementation cases provided below is illustrative and does not specifically limit the present invention.

The hair follicle-type micro-texture of the present invention, which is narrow at the top and wide at the bottom, realizes the complex morphology through longitudinal changes. The hair follicle type micro-texture of the present invention has the characteristics and advantages that when the reinforcement is embedded in the micro-depression, the hair follicle structure will lock the formed part of the reinforcement, and the effective contact surface area between the matrix and the reinforcement will be formed at the same time. Structural interlocking, thereby improving the interfacial bonding strength of the composite material and the service life of the composite material. The parameters of the follicular microtexture can be adjusted according to the combination of different materials, effectively increasing the applicable occasions of the follicular microtexture.

A hair follicle-type micro-texture with high bonding strength. The hair follicle type is a composite micro-topography of upper columns and lower spheroids. On the surface of the base material 1, hair roots 2, hair bulbs 3, hair protrusions 4 and distance between hair protrusions are processed. The composite microtopography of 5, the composite microtopography has two kinds of longitudinally arranged micro-concavity shapes, and the optimized geometric parameters according to the specific shape of hair follicles in different materials are: the depth of hair root 2 H≧5 μm, the depth of hair root 2 The diameter D≧100μm, the depth H1≧5μm of the hair bulb 3, the diameter D1≧(1.1～2)D of the hair bulb 3, the diameter d=(1～1/5)D1 of the hair convex 4, the value of the hair convex distance 5 0≦δ≦D1-2d, as shown in Figures 3 and 4.

The hair convex distance 5 is determined by the hair convex 4, when the hair convex 4 is one, the value of the hair convex distance 5 is δ=0, at this time, the hair convex 4 and the hair bulb 3 have the same structure, which is called a single hair convex hair follicle type microtexture; when the number of hairy convexities 4 is greater than or equal to 2, the distance between hairy convexities 5 is determined by the number and diameter of hairy convexities 4, which is called multi-hairy follicular microtexture.

The composite morphology can exist on all or part of the surface of the base material 1, depending on the properties, uses and composite process conditions of different base materials 1, the occupancy of the area of the follicle-type micro-morphology The area occupancy rate is the ratio of the surface area of the hair root 2 to the square of the distance L between the centers of adjacent shapes, and L is shown in FIG. 5 .

The processing method of the hair follicle type micro-texture with high binding strength comprises the following steps:

S1. Roughen the surface of the base material 1. Appropriate surface roughness can not only increase the bonding area of the material but also increase the interface bonding strength. Generally, the arithmetic mean deviation of the surface profile of the base material is Ra≦0.8μm or 1.0μm. The maximum height of Rz≦1.6μm or 3.2μm, the special requirements of the matrix material are determined by the composite performance and composite process;

S2. Design the follicle-shaped morphology on the surface of the matrix. According to the application field and bonding strength of the composite material, the composite micro-morphology exists on all or part of the surface of the matrix material 1, and the morphology is a single-hair follicle type or a multi-hair follicle type;

S3. Use laser to process the hair root 2 and hair bulb 3 parts of the hair follicle micro-texture on the surface of the base material 1. The specific laser processing parameters are: the laser wavelength for laser texturing is 532nm or 2×532nm, and the defocus amount is [- 1.2, 1.2]mm, pulse width 0.5ms, pulse frequency 1KHz ~ 10KHz, energy density 10 ⁴ ~ 10 ⁶ W/cm ² , the laser processing angle is 0° ~ 45° with the normal direction of the substrate surface 1, after processing is completed The thickness of the surface hardened layer produced on the surface 1 of the base material can reach about 450 μm;

S4. Use laser to process the preliminary shape of the hairy protrusion 4 inside the hair ball 3, and then use a certain concentration of corrosive liquid to perform lateral corrosion on the hairy protrusion 4. For ordinary hair balls 3, the corrosive liquid can be injected with a micron-scale quantitative syringe. The small hairball 3 can be quantitatively injected with the "liquid force microscope" syringe;

S5, using a syringe to inject a corrosive cleaning solution to clean the convex 4 for 3 to 6 times;

S6. Using a composite process to integrate or embed the reinforcement material into the follicle-shaped micro-pits of the matrix material 1 to prepare a composite material.

Embodiment one:

A preparation of a buffer strip with a follicular microstructure, as shown in Figure 7. The base material 1 is a metal skeleton, and the aluminum alloy material is selected as shown in Figure 6-(1), and a general-purpose buffer strip of 900×100×70 is prepared. The laser wavelength of the laser texturing machine used in this case is 532nm, the defocus amount is [-1.2, 1.2]mm, the pulse width is 0.5ms, the pulse frequency is 1KHz, and the energy density is 10 ⁴ W/cm ² . The material surface normal is at 0°.

To process the single-hair follicle-type micro-texture in Figure 1, use the above-mentioned laser texturing technology to process the hair root 2 in Figure 6-(2) on the surface of the aluminum alloy of the base material 1. The depth of the hair root 2 is H=100μm, and the hair root 2 has a diameter D=200 μm.

As shown in Figure 6-(3), it is laser shock/texturization. Laser texturing technology is used at the bottom to assist ablation and vaporization with nitrogen gas. 3 is the same structure) with a diameter d=200 μm to 220 μm. Choose acetone to clean the aluminum alloy metal skeleton, hold it on the corrosion device, wash it with pure water, and air dry it. At 25°C, use a medical needle to inject 30% nitric acid etching solution to laterally etch the microtexture. The etching solution stays for about 90s to 430s, then cleans it with pure water and air-dries it. 6-(4).

The rubber is blended into the hair follicle-shaped micro-pits of the aluminum alloy composite matrix by thermal vulcanization composite technology for composite and cooling.

Embodiment two:

Preparation of a buffer strip with hair follicle-type micro-texture, the base material 1 is a metal skeleton, steel is selected as shown in Figure 7-(1), and an underground buffer strip of 1220×100×70 is prepared. The laser texturing machine used in this case has a laser wavelength of 1064nm, a defocus of [-1.2, 1.2]mm, a pulse width of 0.5ms, a pulse frequency of 5KHz, an energy density of 10 ⁵ W/cm ² , and nitrogen as an auxiliary gas. The laser processing angle is 30° to the surface normal of the base material.

Process the hairy follicle-type micro-texture in Figure 2, select the processed steel metal skeleton material, and use the above-mentioned laser texturing technology to process the hair root 2 in Figure 7-(2) on the steel surface, and the depth H of the hair root 2 = 500 μm, and the diameter D of the hair root 2 = 1 mm.

As shown in Figure 7-(3), the bottom of the hair root is ablated and vaporized using laser texturing technology with nitrogen assistance, the depth H1 of the hair bulb 3 = 150 μm, the diameter of the hair bulb 3 is about 1000 μm, and the diameter of the hair convex 4 d = 200 μm, the number of burrs 4 is 2, and the value of the burrs pitch 5 is δ≦100 μm.

As shown in Figure 7-(4), at 25°C, use a medical needle to inject 30% nitric acid etching solution to laterally corrode the microtexture, stay for 210s-2105s, then wash with pure water and air-dry. The diameter is 10 μm to 100 μm.

The thermal vulcanization composite technology is used to blend the rubber into the hair follicle-shaped micro-pit of the steel matrix for compounding and cooling.

As mentioned above, in one or more embodiments, the follicle-type microstructure can be designed in different ways according to the materials and composite processes of its matrix and reinforcement.

It should be understood that although this description is described according to various embodiments, not each embodiment only includes an independent technical solution, and this description of the description is only for clarity, and those skilled in the art should take the description as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiment or All changes should be included within the protection scope of the present invention.

Claims (10)

1. a kind of micro- texture of hair follicle type of high bond strength, it is characterised in that the hair follicle processed on matrix material (1) surface Type is combined micromorphology, and it is along the multiple up and down of the direction progress perpendicular to matrix material (1) side that the hair follicle type, which is combined micromorphology, The micromorphology of conjunction, including top are in the form of a column the hair root (2) of body, and bottom is in be wrapped inside the ball top (3) of orbicule, the ball top (3) Include several mao convex (4), the diameter of the hair root (2) is less than the diameter of the ball top (3).

2. the micro- texture of hair follicle type of high bond strength according to claim 1, it is characterised in that when the hair convex (4) When quantity is one, hair convex (4) is same structure with ball top (3), and the micro- texture of hair follicle type is the single mao of convex micro- texture of hair follicle type；

As the Shuo Liang≤2 of the hair convex (4), the micro- texture of hair follicle type is the convex micro- texture of hair follicle type of crinosity, and the hair is convex (4) Between have the convex spacing of hair (5).

3. the micro- texture of hair follicle type of high bond strength according to claim 1 or 2, it is characterised in that the hair root (2) Depth H≤5 μm, diameter D≤100 μm of the hair root (2), 1≤5 μm of the depth H of the ball top (3), the ball top (3) it is straight Footpath D1≤(1.1~2) D.

4. the micro- texture of hair follicle type of high bond strength according to claim 3, it is characterised in that the hair convex (4) it is straight Footpath d=(1~1/5) D1.

5. the micro- texture of hair follicle type of high bond strength according to claim 4, it is characterised in that between the hair convex (4) The convex spacing of hair (5) value be 0 ≦ δ≤D1-2d.

6. the micro- texture of hair follicle type of high bond strength according to claim 3, it is characterised in that the hair follicle type is combined micro- There is all or part of surface of matrix material (1) in pattern, the occupation rate that the hair follicle type is combined micromorphology area isThe occupation rate μ that i.e. described hair follicle type is combined micromorphology area is the surface area of the hair root (2)With it is adjacent Between hair root (2) centre-to-centre spacing L square ratio.

7. a kind of processing method of the micro- texture of hair follicle type of high bond strength according to claim 1, it is characterised in that including Following steps：

S1, the surface to matrix material (1) carry out coarse processing；

S2, design matrix material (1) surface hair follicle type pattern are the single mao of convex convex hair follicle type of hair follicle type or crinosity；

S3, the hair root (2) using the micro- texture of hair follicle type for laser machining matrix material (1) surface and ball top (3) part, the hair Root (2) and ball top (3) are genesis analysis, and the diameter of the hair root (2) is less than the diameter of the ball top (3)；

S4, the preliminary pattern using laser roughening technology processing ball top (3) internal hair convex (4), and then using corrosive liquid to hair Convex (4) carry out lateral encroaching；

S5, using syringe inject corrosive agent cleaning fluid (4) convex to the hair clean；

S6, using combination process by reinforcement material incorporate or embedded matrix material (1) hair follicle type nick cheat in, i.e. hair follicle type Micro- texture, carries out the preparation of composite.

8. the processing method of the micro- texture of hair follicle type of high bond strength according to claim 7, it is characterised in that the step The arithmetic average deviation of matrix material described in S1 (1) surface profile is Ra≤0.8 μm or Ra≤1.0 μm, the maximum of profile Highly it is Rz≤1.6 μm or Rz≤3.2 μm.

9. the processing method of the micro- texture of hair follicle type of high bond strength according to claim 7, it is characterised in that the step Specific laser processing parameter is in S2：The optical maser wavelength of laser roughening be 532nm or 2 × 532nm, defocusing amount for [- 1.2, 1.2] mm, pulse width is 0.5ms, and pulse frequency is 1KHz~10KHz, and energy density is 10⁴~10⁶W/cm²。

10. the processing method of the micro- texture of hair follicle type of high bond strength according to claim 7 or 9, it is characterised in that described It is in 0 °~45 ° that angle is laser machined in step S2 with matrix material (1) surface normal.