Silicon nitride gradient porous capillary core for loop heat pipe and preparation method of silicon nitride gradient porous capillary core

A gradient porous, loop heat pipe technology, applied in applications, ceramic products, household appliances, etc., can solve the problems of complex and single processing, and achieve the effect of simple preparation process, corrosion resistance thermal conductivity, and wide range of use

Active Publication Date: 2018-05-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional capillary pumps have a single pore size and porosity, and it is difficult to achieve efficient transfer of steam while improving capillary suction.
Moreover, the traditional pressing process can only prepare some capillary core products with simple shapes, and the processing is complicated.

Method used

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  • Silicon nitride gradient porous capillary core for loop heat pipe and preparation method of silicon nitride gradient porous capillary core
  • Silicon nitride gradient porous capillary core for loop heat pipe and preparation method of silicon nitride gradient porous capillary core
  • Silicon nitride gradient porous capillary core for loop heat pipe and preparation method of silicon nitride gradient porous capillary core

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preparation example Construction

[0036]Preparation of slurry. Specifically, silicon nitride ceramic slurry is prepared, and silicon nitride powder, sintering aid, gelling agent, and pore-forming agent are sequentially added to deionized water, and mixed by ball milling to obtain a uniformly mixed slurry . Wherein, the mass ratio of the silicon nitride powder (generally 0.3-0.8 micron), sintering aid, gelling agent, pore-forming agent and water can be 100: (0.5-10): (0.1-5): (1~50): (20~300). In the present invention, by controlling the amount or type of pore-forming agent added in the slurry, and regulating the porosity of the colloidal porosity after the slurry gel is solidified, finally control the nitriding in the silicon nitride gradient porous capillary core for the obtained loop heat pipe. Pore ​​diameter and porosity of silicon macroporous layer and silicon nitride small porous layer. Control the mass ratio of silicon nitride powder, sintering aid, gelling agent, pore-forming agent and water to 100:...

Embodiment 1

[0043] (1) Add 100g of silicon nitride balls, 40g of deionized water, 2.5g of sintering aid yttrium oxide, 47.5g of silicon nitride powder and 1g of gelling agent gelatin respectively in two ball mill jars, and the ball mill rotating speed is 350rpm, Obtain water-based slurry after ball milling for 2 hours;

[0044] (2) Add 2g and 20g of cyclohexane to the two tanks of slurry respectively, and continue ball milling for 1 hour to obtain two kinds of slurries with different pore-forming agent contents, respectively numbering 1 and 2 slurries;

[0045] (3) Pour No. 1 slurry into the plaster mold, pour out the excess slurry after solidifying at 25°C for 3 minutes, continue pouring No. 2 slurry, and solidify at 25°C for 1 hour, and get A ceramic green body with a double-layer porous structure with large holes in the inner layer and small holes in the outer layer;

[0046] (4) After the wet blank is demoulded, dry it at room temperature for 48 hours to obtain a ceramic green body; ...

Embodiment 2

[0049] (1) Add 100g of silicon nitride balls, 40g of deionized water, 2.5g of sintering aid yttrium oxide, 47.5g of silicon nitride powder and 0.2g of gelling agent isobutylene-maleic anhydride copolymer into two ball milling tanks matter, the ball mill rotating speed is 350rpm, and the water-based slurry is obtained after ball milling for 2 hours;

[0050] (2) Add 0g and 20g of starch to the two cans of slurry respectively, and continue ball milling for 1 hour to obtain two kinds of slurries with different pore-forming agent contents, numbering 1 and 2 slurries respectively;

[0051] (3) Inject the No. 1 slurry into the plaster mold, pour out the excess slurry after solidifying at 25°C for 1 minute, continue pouring the No. 2 slurry, and solidify at 25°C for 2 hours, and obtain A ceramic green body with a double-layer porous structure with large holes in the inner layer and small holes in the outer layer;

[0052] (4) After the wet blank is demoulded, dry it at room temperat...

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Abstract

The invention relates to a silicon nitride gradient porous capillary core for a loop heat pipe and a preparation method of the silicon nitride gradient porous capillary core. The preparation method comprises the following steps: injecting at least two types of silicon nitride slurry having different proportions into a mold for gel solidification, drying, sintering and processing to obtain the silicon nitride gradient porous capillary core for the loop heat pipe, wherein the silicon nitride slurry is prepared from silicon nitride powder, a sintering aid, gel, a pore forming material and water;the content of the pore forming material in the silicon nitride slurry injected into the mold at first is lower than that of the pore forming material in the silicon nitride slurry injected into the mold later.

Description

technical field [0001] The invention relates to a silicon nitride capillary core for a loop heat pipe, in particular to the design and preparation of a capillary core with a gradient porous structure, and belongs to the field of temperature control. Background technique [0002] As an efficient phase change heat transfer device, the loop heat pipe is a key component for the stable and long-life operation of electronic components and aerospace devices at a constant temperature, and the main core of the capillary pump is one of the most critical components in the loop heat pipe. With the increasing power consumption of related instruments and equipment, the requirements for heat dissipation and constant temperature of the system are getting higher and higher. The existing metal capillary main core can no longer meet the requirements of stability and longevity in terms of heat dissipation and corrosion resistance. Choosing porous silicon nitride as the preparation material of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622C04B38/06C04B35/64
CPCC04B35/584C04B35/622C04B35/64C04B38/0645C04B38/067
Inventor 曾宇平姚冬旭王锋左开慧夏咏锋尹金伟梁汉琴
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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