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

A gradient porous, loop heat pipe technology, used in applications, ceramic products, household appliances, etc., can solve the problems of single, complex processing, etc., and achieve the effects of simple preparation process, large capillary suction, and high permeability

Active Publication Date: 2020-11-10
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 thereof
  • Silicon nitride gradient porous capillary core for loop heat pipe and preparation method thereof
  • Silicon nitride gradient porous capillary core for loop heat pipe and preparation method thereof

Examples

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preparation example Construction

[0036] Preparation of slurry. Specifically, the silicon nitride ceramic slurry is prepared, and the silicon nitride powder, sintering aid, gelling agent, and pore former 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 microns), sintering aid, gelling agent, pore former and water may be 100: (0.5-10): (0.1-5): (1~50): (20~300). The present invention controls the amount or type of pore-forming agent added in the slurry, and thereby regulates the colloidal porosity after solidification of the slurry gel, and finally controls the nitridation in the obtained silicon nitride gradient porous capillary core for loop heat pipes. The pore size and porosity of the silicon macroporous layer and the silicon nitride small porous layer. Control the mass ratio of silicon nitride powder, sintering aid, gelling agent, pore former and water to 100: (0.5~10): (0.1~5...

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 gelatin to the two ball mill tanks. The speed of the ball mill is 350rpm. A water-based slurry is obtained after 2 hours of ball milling;

[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 slurries with different pore former contents, numbered 1 and 2 respectively;

[0045] (3) Pour the No. 1 slurry into the plaster mold, pour out the excess slurry after curing at 25°C for 3 minutes, continue pouring the No. 2 slurry, cure it at 25°C for 1 hour, and wait for the gel to get Ceramic wet body with double pore structure with large pores in the inner layer and small pores in the outer layer;

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

[0047] (5) Raise the ceramic body in a nitrogen atmosphere a...

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 into the two ball mills. The speed of the ball mill is 350 rpm, and the water-based slurry is obtained after 2 hours of ball milling;

[0050] (2) Add 0g and 20g starch to the two tanks of slurry respectively, and continue ball milling for 1 hour to obtain two slurries with different pore former contents, numbered 1 and 2 respectively;

[0051] (3) Pour the No. 1 slurry into the plaster mold, pour out the excess slurry after curing for 1 minute at 25°C, continue to pour the No. 2 slurry, cure it at 25°C for 2 hours, and wait for the gel to get Ceramic wet body with double-layer pore structure with large pores in the inner layer and small pores in the outer layer;

[0052] (4) After demolding the wet body, dry it at room temperature for 48 hours to obtain a ceramic body;

[0053] (5) Raise the ...

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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, and the existing metal capillary core core can no longer meet the needs of stable and long life in terms of heat dissipation and corrosion resistance. Choosing porous silicon nitride as the material for the capillary core can ...

Claims

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Application Information

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Patent Type & Authority Patents(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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