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NL2032389A - Energy-saving thermal insulation device for microwave kiln and method for preparing same - Google Patents

Energy-saving thermal insulation device for microwave kiln and method for preparing same Download PDF

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Publication number
NL2032389A
NL2032389A NL2032389A NL2032389A NL2032389A NL 2032389 A NL2032389 A NL 2032389A NL 2032389 A NL2032389 A NL 2032389A NL 2032389 A NL2032389 A NL 2032389A NL 2032389 A NL2032389 A NL 2032389A
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NL
Netherlands
Prior art keywords
wall
ceramic
layer
thermal insulation
infrared reflective
Prior art date
Application number
NL2032389A
Other languages
Dutch (nl)
Other versions
NL2032389B1 (en
Inventor
Wang Hailong
Zhou Yabo
Fan Bingbing
Song Limeng
Min Zhiyu
Chen Yongqiang
Song Bo
Li Mingliang
Wang Hailiang
Li Hongxia
Zhang Rui
Original Assignee
Univ Zhengzhou
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Publication of NL2032389A publication Critical patent/NL2032389A/en
Application granted granted Critical
Publication of NL2032389B1 publication Critical patent/NL2032389B1/en

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    • C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
    • C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F27B17/00—Furnaces of a kind not covered by any of groups F27B1/00 - F27B15/00
    • F27B17/0016—Chamber type furnaces
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    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/6261—Milling
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    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
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    • C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B35/63488—Polyethers, e.g. alkylphenol polyglycolether, polyethylene glycol [PEG], polyethylene oxide [PEO]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0028—Microwave heating

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Abstract

The present invention relates to the technical field of ceramic material manufacturing, and discloses an energy-saving thermal insulation device for microwave kilns and a method for preparing the same. The device comprises a box provided with an opening and a cover covering the opening of the box, wherein the box comprises an inner wall and an outer wall, and a gap is preset between the inner wall and the outer wall, the cover covers upper ends of the inner wall and the outer wall and forms an accommodating cavity with the gap, and the accommodating cavity is filled with a ceramic aerogel to form an intermediate thermal insulation layer, an inner surface of the inner wall is provided with a first infrared-reflective ceramic layer, and a surface of the cover matched for fitting the box is provided with a second infrared-reflective ceramic layer. According to the present invention, the inner surface of the inner wall is provided with a highly near infrared-reflective ceramic coating, thus increasing the reflectivity of an inner surface of the thermal insulation layer to radiation of a workpiece. Meanwhile, the ceramic aerogel added between the inner wall and the outer wall replaces original thermal insulation cotton, and reduces the weight and energy consumption of the whole thermal insulation device and the thermal radiation absorption of the thermal insulation layer from the workpiece, thereby achieving a better thermal insulation effect.

Description

ENERGY-SAVING THERMAL INSULATION DEVICE FOR MICROWAVE KILN AND METHOD FOR PREPARING SAME
TECHNICAL FIELD The present invention relates to the technical field of ceramic material manufacturing, and specifically to an energy-saving thermal insulation device for microwave kilns and a method for preparing the same.
BACKGROUND Due to the rapidly increasing energy consumption and the low energy utilization rate, the situation of energy conservation and consumption reduction in China is still severe. With thermal engineering kilns as a representative, the industrial energy consumption for high-temperature processes accounts for about 25% of the total energy consumption in China. According to statistical analyses, the average thermal efficiency of existing thermal engineering kiln equipment in China is lower than 40% and is 10-20% lower than that of developed countries. However, such data also suggest that the thermal engineering equipment industry has a great energy conservation potential. As an advanced manufacture technology, microwave sintering features high temperature ramping rate, high energy utilization rate, high heating efficiency, safety and no pollution, and has become a new research hotspot in the field of material sintering. Thermal insulation device, which is a key factor for guaranteeing efficient utilization of microwaves, is essential in a microwave heating process. In the prior art, the Chinese Patent Application Nos. CN201510308753.3 and CN201410309340.2 relate to an auxiliary heating thermal insulation device. However, in the above-mentioned patents, only microwave transparency and thermal conductivity of the thermal insulation layer are considered; also, the structure mainly comprises thermal insulation plates on the inner and outer sides and an intermediate thermal insulation cotton, and the importance of thermal radiation in the microwave sintering is ignored. The microwave sintering and conventional sintering have significant differences. In a conventional sintering process, the thermal radiation is conducted on a workpiece by using a surrounding heating element, and the temperature of a surrounding thermal insulation layer is significantly higher than that of the workpiece. In the prior art, the heating efficiency is mainly improved by increasing the emissivity of the inner surface of the thermal insulation layer. However, according to the principle of microwave sintering, the microwave penetrates through the thermal insulation layer to directly act on a workpiece, and after the workpiece absorbs microwaves, the temperature of the workpiece is increased. Therefore, in a microwave kiln, the temperature of a workpiece is significantly higher than that of a surrounding thermal insulation layer. As is well known, the thermal radiation of a high-temperature object to a low-temperature object is far greater than that of the low-temperature object to the high-temperature object. Therefore, heat generated by the workpiece absorbing the microwave is transmitted to a thermal insulation layer in a radiation mode. As a result, the temperature of the thermal insulation layer and the whole thermal insulation structure is increased, and a large amount of energy is consumed. In a conventional industrial kiln, the inner wall of the thermal insulation layer is coated with a high-emissivity coating. Enhanced radiation heat transfer is an effective way to realize energy conservation in a thermal engineering kiln. However, in a microwave kiln, the workpiece generates heat and radiates energy outwards, and the temperature of the surrounding kiln wall is significantly lower than that of the workpiece. When a conventional coating of high infrared emissivity is used, a very low effect may be achieved.
SUMMARY In order to solve the above-mentioned technical problems, the present invention adopts the following technical schemes: Provided is an energy-saving thermal insulation device for microwave kilns, comprising a box provided with an opening and a cover covering the opening of the box, wherein the box comprises an inner wall and an outer wall, and a gap is preset between the inner wall and the outer wall; the cover covers upper ends of the inner wall and the outer wall and forms an accommodating cavity with the gap, and the accommodating cavity is filled with an intermediate thermal insulation layer, an inner surface of the inner wall is provided with a first infrared-reflective ceramic layer, and a surface of the cover matched for fitting the box is provided with a second infrared-reflective ceramic layer. Furthermore, a temperature measuring hole is provided in the middle of the cover.
Furthermore, the intermediate thermal insulation layer is made of a ceramic aerogel, the inner wall is a first thermal insulation layer made of a porous ceramic; and the outer wall is a second thermal insulation layer made of the porous ceramic.
Furthermore, the cover comprises a cover body and a surrounding edge surrounding a circumferential surface of the cover body; the cover body comprises a first cover layer, a cover thermal insulation layer and a second cover layer which are arranged from top to bottom in sequence; the second cover layer is positioned on a side for fitting the box; and an outer surface of the second cover layer is provided with the second infrared-reflective ceramic layer.
Also provided is a method for preparing an energy-saving thermal insulation device for microwave kilns, comprising: S10, mixing titanium oxide, yttrium oxide, cerium oxide and lanthanum oxide powders in a certain ratio, adding a certain amount of alcohol and polyethylene glycol 800, and conducting a primary ball-milling mixing; adding polyvinyl butyral and butyl benzyl phthalate, and conducting a secondary ball-milling mixing, and conducting vacuum defoaming to obtain an infrared-reflective ceramic slurry; S20, preparing the inner wall with the porous ceramic, applying the infrared-reflective ceramic slurry on an inner surface of a ceramic plate of the inner wall to form the first infrared-reflective ceramic layer, drying for 2-4 h, and sintering at a high temperature for 1-3 h to obtain a composite ceramic thermal insulation layer of the inner wall; S30, preparing the outer wall with the porous ceramic, and filling the ceramic aerogel between the inner wall and the outer wall to form the intermediate thermal insulation layer; and S40, applying the infrared-reflective ceramic slurry on a surface of a ceramic plate of the cover for fitting the box to form the second infrared-reflective ceramic layer, drying for 2—4 h, and sintering at a high temperature for 1-3 h to obtain a composite ceramic thermal insulation layer of the cover. Furthermore, in step S10, the titanium oxide, yttrium oxide, cerium oxide and lanthanum oxide powders are mixed in a molar ratio of 7:1:1:1, and have a particle size of less than 1 um.
Furthermore, in step S10, 15-30 wt% of the alcohol and 0.5-1 wt% of the polyethylene glycol 800 are added, and the primary ball-milling mixing is conducted at 100-200 r/min for 4-6 h; 2 wt% of a mixture of the polyvinyl butyral and the butyl benzyl phthalate in a mass ratio of 1:1 is added, and the secondary ball-milling mixing is conducted at 100-200 r/min for 4-6 h; the vacuum defoaming is conducted for 30 min to obtain the infrared-reflective ceramic slurry.
Furthermore, in step S20, after the infrared-reflective ceramic slurry is applied on the inner surface of the ceramic plate of the inner wall to form the first infrared-reflective ceramic layer, dried at 80 °C for 2—4 h, and then sintered at a high temperature of 1,000-1,300 °C for 1-3 h to obtain the composite ceramic thermal insulation layer of the inner wall; in step S40, after the infrared-reflective ceramic slurry 1s applied on the surface of the ceramic plate of the cover for fitting the box to form the second infrared-reflective ceramic layer, dried at 80 °C for 2—4 h, and then sintered at a high temperature of 1,000-1,300 °C for 1-3 h to obtain the composite ceramic thermal insulation layer of the cover.
Furthermore, the inner wall and the outer wall are made of one of mullite and silicon oxynitride ceramic with a porosity of 15-30%; the inner wall has a thickness of 5-10 mm; the outer wall has a thickness of 10-15 mm; the first infrared-reflective ceramic layer and the second infrared-reflective ceramic layer have a thickness of 1-2 mm.
Furthermore, in step S30, the ceramic aerogel filled between the inner wall and the outer wall is one of mullite and silicon carbide, and the intermediate thermal insulation layer has a thickness of 15-30 mm.
Beneficial Effects: According to the present invention, the inner surface of the inner wall is provided with a highly near infrared-reflective ceramic coating, thus increasing the reflectivity of an inner surface of the thermal insulation layer to radiation of a workpiece. Meanwhile, the ceramic aerogel added between the inner wall and the outer wall replaces original thermal insulation cotton, and reduces the weight and energy consumption of the whole thermal insulation device and the thermal radiation absorption of the thermal insulation layer from the workpiece, thereby achieving a 5 better thermal insulation effect. In addition, after the energy-saving thermal insulation device disclosed in the present invention 1s used, the heating rate of a workpiece is significantly increased at the same microwave input power, and the required input power is significantly reduced in a thermal insulation state.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of the overall structure of the present invention; FIG. 2 is an SEM view of the highly infrared-reflective ceramic coating obtained in Example 2; In the drawings: 1, inner wall; 2, outer wall; 3, intermediate thermal insulation layer; 4, first infrared-reflective ceramic layer; 5, temperature measuring hole; 6, cover; 61, first cover layer; 62, cover thermal insulation layer; 63, second cover layer; 64, surrounding edge; and 65, second infrared-reflective ceramic layer.
DETAILED DESCRIPTION Example 1 Provided is an energy-saving thermal insulation device for microwave kilns, comprising a box provided with an opening and a cover 6 covering the opening of the box, wherein the box comprises an inner wall 1 and an outer wall 2, and a gap is preset between the inner wall 1 and the outer wall 2; the cover 6 covers upper ends of the inner wall 1 and the outer wall 2 and forms an accommodating cavity with the gap, and the accommodating cavity is filled with a ceramic aerogel to form an intermediate thermal insulation layer 3; an inner surface of the inner wall 1 is provided with a first infrared-reflective ceramic layer 4, and a surface of the cover 6 matched for fitting the box is provided with a second infrared-reflective ceramic layer 65. In this example, the inner wall 1 and the outer wall 2 are both U-shaped, and openings on the inner wall 1 and the outer wall 2 are positioned on the same side.
In this example, a temperature measuring hole 5 is provided in the middle of the cover 6. In this example, the inner wall 1 is a first thermal insulation layer made of a porous ceramic; and the outer wall 2 is a second thermal insulation layer made of the porous ceramic.
In this example, the cover 6 comprises a cover body and a surrounding edge 64 surrounding a circumferential surface of the cover body; the cover body comprises a first cover layer 61, a cover thermal insulation layer 62 and a second cover layer 63 which are arranged from top to bottom in sequence; the second cover layer is positioned on a side for fitting the box; and an outer surface of the second cover layer 63 is provided with the second infrared-reflective ceramic layer 65. The first cover layer 61 and the second cover layer 63 are made of the porous ceramic.
Example 2 In this example, a method for preparing the energy-saving thermal insulation device for microwave kilns in Example 1 is provided, comprising: S10, mixing titanium oxide, yttrium oxide, cerium oxide and lanthanum oxide powders in a certain ratio, adding a certain amount of alcohol and polyethylene glycol 800, and conducting a primary ball-milling mixing; adding polyvinyl butyral and butyl benzyl phthalate, and conducting a secondary ball-milling mixing; and conducting vacuum defoaming to obtain an infrared-reflective ceramic slurry; S20, preparing the inner wall 1 with the porous ceramic, applying the infrared-reflective ceramic slurry on an inner surface of a ceramic plate of the inner wall 1 to form the first infrared-reflective ceramic layer 4, drying for 2—4 h, and sintering at a high temperature for 1-3 h to obtain a composite ceramic thermal insulation layer of the inner wall; S30, preparing the outer wall 2 with the porous ceramic, and filling the ceramic aerogel between the inner wall 1 and the outer wall 2 to form the intermediate thermal insulation layer 3; and S40, applying the infrared-reflective ceramic slurry on a surface of a ceramic plate of the cover 6 for fitting the box to form the second infrared-reflective ceramic layer 65, drying for 2-4 h, and sintering at a high temperature for 1-3 h to obtain a composite ceramic thermal insulation layer of the cover.
In step S10, the titanium oxide, yttrium oxide, cerium oxide and lanthanum oxide powders are mixed in a molar ratio of 7:1:1:1, and have a particle size of less than 1 um. 15-30 wt% of the alcohol and 0.5-1 wt% of the polyethylene glycol 800 are added, and the primary ball-milling mixing is conducted at 100-200 r/min for 4-6 h; 2 wt% of a mixture of the polyvinyl butyral and the butyl benzyl phthalate in a mass ratio of 1:1 is added, and the secondary ball-milling mixing is conducted at 100-200 r/min for 4-6 h; the vacuum defoaming is conducted for 30 min to obtain the infrared-reflective ceramic slurry.
In step S20, after the infrared-reflective ceramic slurry is applied on the inner surface of the ceramic plate of the inner wall 1 to form the first infrared-reflective ceramic layer 4, dried at 80 °C for 2—4 h, and then sintered at a high temperature of 1,000-1,300 °C for 1-3 h to obtain the composite ceramic thermal insulation layer of the inner wall.
In step S40, after the infrared-reflective ceramic slurry is applied on the surface of the ceramic plate of the cover 6 for fitting the box to form the second infrared-reflective ceramic layer 65, dried at 80 °C for 2—4 h, and then sintered at a high temperature of 1,000-1,300 °C for 1-3 h to obtain the composite ceramic thermal insulation layer of the cover.
The inner wall 1 and the outer wall 2 are made of one of mullite and silicon oxynitride ceramic with a porosity of 15-30%; the inner wall 1 has a thickness of 5-10 mm; the outer wall 2 has a thickness of 10-15 mm; the first infrared-reflective ceramic layer and the second infrared-reflective ceramic layer have a thickness of 1-2 mm.
In step S30, the ceramic aerogel filled between the inner wall 1 and the outer wall 2 is one of mullite and silicon carbide, and the intermediate thermal insulation layer 3 has a thickness of 15-30 mm.
Results of comparative experiment: After the energy-saving thermal insulation device disclosed in the present invention is used, the heating rate of a workpiece is significantly increased at the same microwave input power, and the required input power is significantly reduced in a thermal insulation state.
With microwave sintering of zirconia ceramic as an example, the comparative experimental results are as follows: Time to 1500 °C Power for maintenance at 1500 °C
Conventional thermal About 90 min About 7 kW insulation device
Energy-saving thermal About 75 min About 6 kW insulation device
The above description is only preferred embodiments of the present invention, and is not intended to limit the technical scope of the present invention.
As such, any minor amendments, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention shall fall within the scope of the technical scheme of the present invention.

Claims (8)

Conclusies 1 Energiebesparende, thermisch isolerende inrichting voor magnetronovens, die een doos omvat die is voorzien van een opening en een deksel voor het afdekken van de opening van de doos, waarbij de doos een binnenste wand en een buitenste wand omvat, en waarbij een opening tevoren is aangebracht tussen de binnenste wand en de buitenste wand; waarbij het deksel de bovenste uiteinden afdekt van de binnenste wand en de buitenste wand en een ruimte om iets in onder te brengen vormt met de opening, en waarbij de ruimte om iets in onder te brengen is gevuld met een tussenliggende, thermisch isolerende laag; waarbij een binnenoppervlak van de binnenste wand is voorzien van een eerste infrarood reflecterende keramische laag, en waarbij een oppervlak van het deksel dat van een passende vorm is voorzien om te passen op de doos is voorzien van een tweede infrarood reflecterende keramische laag.Claims 1 Energy-saving, thermally insulating device for microwave ovens, comprising a box provided with an opening and a lid for covering the opening of the box, the box comprising an inner wall and an outer wall, and an opening pre-sealed is arranged between the inner wall and the outer wall; wherein the lid covers the upper ends of the inner wall and the outer wall and forms a containment space with the opening, and wherein the containment space is filled with an intermediate thermally insulating layer; wherein an inner surface of the inner wall is provided with a first infrared reflective ceramic layer, and wherein a surface of the lid which is suitably shaped to fit the box is provided with a second infrared reflective ceramic layer. 2 Energiebesparende, thermisch isolerende inrichting voor magnetronovens volgens conclusie 1, waarbij een opening voor het meten van de temperatuur wordt verschaft in het midden van het deksel.The energy-saving thermal insulating device for microwave ovens according to claim 1, wherein a temperature measuring hole is provided in the center of the cover. 3 Energiebesparende, thermisch isolerende inrichting voor magnetronovens volgens conclusie 1, waarbij de tussenliggende, thermisch isolerende laag is vervaardigd van een keramische aerogel, waarbij de binnenste wand een eerste thermisch isolerende laag is die is vervaardigd van een poreuze keramiek; en waarbij de buitenste wand een tweede thermisch isolerende laag is die is vervaardigd van de poreuze keramiek.The energy-saving thermal insulating device for microwave ovens according to claim 1, wherein the intermediate thermal insulating layer is made of a ceramic airgel, the inner wall being a first thermal insulating layer made of a porous ceramic; and wherein the outer wall is a second thermally insulating layer made of the porous ceramic. 4 Energiebesparende, thermisch isolerende inrichting voor magnetronovens volgens conclusie 1, waarbij het deksel een dekselromp omvat en een rondom lopende rand die zich bevindt rondom een omlopend oppervlak van de dekselromp; waarbij de dekselromp het volgende omvat: een eerste deksellaag, een thermisch isolerende deksellaag en een tweede deksellaag, die zijn aangebracht van boven naar beneden, in volgorde;The energy-saving thermal insulation device for microwave ovens according to claim 1, wherein the lid comprises a lid body and a circumferential rim located around a circumferential surface of the lid body; the lid body comprising: a first lid layer, a thermally insulating lid layer and a second lid layer arranged from top to bottom in order; waarbij de tweede deksellaag is aangebracht aan een zijde om te passen op de doos; en waarbij een buitenoppervlak van de tweede deksellaag is voorzien van de tweede infrarood reflecterende keramische laag. wherein the second cover layer is applied to one side to fit the carton; and wherein an outer surface of the second cover layer is provided with the second infrared reflective ceramic layer. 5 Werkwijze voor het vervaardigen van de energiebesparende, thermisch isolerende inrichting voor magnetronovens volgens een van de conclusies 1 - 4, die het volgende omvat: S10, het mengen van poeders van titaanoxide, yttriumoxide, ceriumoxide en lanthaanoxide in een bepaalde verhouding, het toevoegen van een zekere hoeveelheid alcohol en polyetheenglycol 800, en het uitvoeren van een primaire menghandeling in een kogelmolen; het toevoegen van polyvinylbutyral en butylbenzylftalaat, en het uitvoeren van een secundaire menghandeling in een kogelmolen; en het uitvoeren van ontschuimen onder vacuüm, voor het verkrijgen van een infrarood reflecterende keramische slurry; S20, het voorbereiden van de binnenste wand met de poreuze keramiek, het aanbrengen van de infrarood reflecterende keramische slurry op een binnenoppervlak van een keramische plaat van de binnenste wand, voor het vormen van een eerste infrarood reflecterende keramische laag, het drogen gedurende 2 - 4 uur, en het sinteren bij een hoge temperatuur gedurende 1 - 3 uur, voor het verkrijgen van een samengestelde, keramische, thermisch isolerende laag van de binnenste wand; S30, het voorbereiden van de buitenste wand met de poreuze keramiek, en het aanbrengen van de keramische aerogel tussen de binnenste wand en de buitenste wand, voor het vormen van de tussenliggende, thermisch isolerende laag; en S40, het aanbrengen van de infrarood reflecterende keramische slurry op een oppervlak van een keramische plaat van het deksel dat moet passen op de doos, voor het vormen van de tweede infrarood reflecterende keramische laag, gevolgd door drogen gedurende 2 - 4 uur, en sinteren bij een hoge temperatuur gedurende 1 - 3 uur, voor het verkrijgen van een samengestelde, keramische, thermisch isolerende laag van het deksel. A method for manufacturing the energy-saving thermal insulation device for microwave ovens according to any one of claims 1 to 4, comprising: S10, mixing powders of titanium oxide, yttria, cerium oxide and lanthanum oxide in a certain ratio, adding a certain amount of alcohol and polyethylene glycol 800, and performing a primary mixing operation in a ball mill; adding polyvinyl butyral and butyl benzyl phthalate, and performing a secondary mixing operation in a ball mill; and performing vacuum defoaming to obtain an infrared reflective ceramic slurry; S20, preparing the inner wall with the porous ceramic, applying the infrared reflective ceramic slurry to an inner surface of an inner wall ceramic plate, to form a first infrared reflective ceramic layer, drying for 2~4 hours, and sintering at a high temperature for 1 to 3 hours, to obtain a composite ceramic thermal insulating layer of the inner wall; S30, preparing the outer wall with the porous ceramic, and interposing the ceramic airgel between the inner wall and the outer wall, to form the intermediate thermal insulating layer; and S40, applying the infrared reflective ceramic slurry to a surface of a ceramic plate of the lid to fit the box, to form the second infrared reflective ceramic layer, followed by drying for 2-4 hours, and sintering at a high temperature for 1 - 3 hours, to obtain a composite ceramic thermal insulating layer of the lid. 6 Werkwijze volgens conclusie 5, waarbij in stap S10 de poeders van titaanoxide, yttriumoxide, ceriumoxide en lanthaanoxide worden gemengd in een molverhouding van 7:1:1:1, en een deeltjesgrootte hebben van kleiner dan 1 um.The method according to claim 5, wherein in step S10 the powders of titanium oxide, yttria, ceria and lanthanum oxide are mixed in a molar ratio of 7:1:1:1, and have a particle size of less than 1 µm. 7 Werkwijze volgens conclusie 6, waarbij in stap S10 15 - 30 gewichtsprocent van de alcohol en 0,5 - 1 gewichtsprocent van de polyetheenglycol 800 worden toegevoegd, en waarbij de primaire menghandeling in een kogelmolen wordt uitgevoerd bij 100 - 200 omwentelingen per minuut gedurende 4 - 6 uur; waarbij 2 gewichtsprocent van een mengsel van de polyvinylbutyral en de butylbenzylftalaat een massaverhouding van 1:1 wordt toegevoegd, en waarbij de secundaire menghandeling in een kogelmolen wordt uitgevoerd bij 100 - 200 omwentelingen per minuut gedurende 4 - 6 uur; waarbij het ontschuimen onder vacuüm wordt uitgevoerd gedurende 30 minuten, voor het verkrijgen van de infrarood reflecterende keramische slurry.The method of claim 6, wherein 15-30% by weight of the alcohol and 0.5-1% by weight of the polyethylene glycol 800 are added in step S10, and wherein the primary mixing operation is performed in a ball mill at 100-200 rpm for 4 - 6 hours; wherein 2 weight percent of a mixture of the polyvinyl butyral and the butyl benzyl phthalate in a mass ratio of 1:1 is added, and wherein the secondary mixing operation is performed in a ball mill at 100-200 rpm for 4-6 hours; wherein the defoaming is performed under vacuum for 30 minutes, to obtain the infrared reflective ceramic slurry. 8 Werkwijze volgens conclusie 7, waarbij in stap S20, nadat de infrarood reflecterende keramische slurry is aangebracht op het binnenoppervlak van de keramische plaat van de binnenste wand, voor het vormen van de eerste infrarood reflecterende keramische laag, wordt gedroogd bij 80 °C gedurende 2 - 4 uur, en vervolgens wordt gesinterd bij een hoge temperatuur van 1.000 — 1.300 °C gedurende 1 - 3 uur, voor het verkrijgen van de samengestelde, keramische, thermisch isolerende laag van de binnenste wand; waarbij in stap S40, nadat de infrarood reflecterende keramische slurry is aangebracht op het oppervlak van de keramische plaat van het deksel dat moet passen op de doos, voor het vormen van de tweede infrarood reflecterende keramische laag, wordt gedroogd bij 80 °C gedurende 2 - 4 uur, en vervolgens wordt gesinterd bij een hoge temperatuur van 1.000 — 1.300 °C gedurende 1 - 3 uur, voor het verkrijgen van de samengestelde, keramische, thermisch isolerende laag van het deksel. 8 Werkwijze volgens conclusie 8, waarbij de binnenste wand en de buitenste wand zijn vervaardigd van één van mulliet en een siliciumoxynitride-keramiek met een porositeit van 15 - 30 %; waarbij de binnenste wand een dikte heeft van 5 - 10 mm, waarbij de buitenste wand een dikte heeft van 10 - 150 mm, en waarbij de eerste infrarood reflecterende keramische laag en de tweede infrarood reflecterende keramische laag een dikte hebben van 1 - 2 mm.The method of claim 7, wherein in step S20, after the infrared reflective ceramic slurry is applied to the inner surface of the inner wall ceramic sheet to form the first infrared reflective ceramic layer, it is dried at 80°C for 2 - 4 hours, and then sintered at a high temperature of 1,000 - 1,300 °C for 1 - 3 hours, to obtain the composite ceramic thermal insulation layer of the inner wall; wherein in step S40, after the infrared reflective ceramic slurry has been applied to the surface of the ceramic sheet of the lid to fit the box, to form the second infrared reflective ceramic layer, is dried at 80°C for 2 - 4 hours, and then sintered at a high temperature of 1,000 - 1,300 °C for 1 - 3 hours, to obtain the composite ceramic thermal insulating layer of the lid. The method of claim 8, wherein the inner wall and the outer wall are made of one of mullite and a silicon oxynitride ceramic having a porosity of 15-30%; wherein the inner wall has a thickness of 5 - 10 mm, the outer wall has a thickness of 10 - 150 mm, and wherein the first infrared reflective ceramic layer and the second infrared reflective ceramic layer have a thickness of 1 - 2 mm. 10 Werkwijze volgens conclusie 9, waarbij in stap S30 de keramische aerogel die wordt aangebracht tussen de binnenste wand en de buitenste wand er een is van mulliet en siliciumcarbide, en waarbij de tussenliggende, thermisch isolerende laag een dikte heeft van 15 - 30 mm.The method of claim 9, wherein in step S30, the ceramic airgel applied between the inner wall and the outer wall is one of mullite and silicon carbide, and the intermediate thermal insulating layer has a thickness of 15-30 mm.
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