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SiC (silicon carbide)-AlN (aluminium nitride) ceramic composite material with high thermal conductivity and preparation method of composite material

A ceramic composite material, sic-aln technology, which is applied in the field of high thermal conductivity SiC-AlN ceramic composite material and its preparation, can solve the problems of low thermal conductivity and no thermal conductivity, and achieves low thermal expansion coefficient, easy operation, The effect of high thermal conductivity

Active Publication Date: 2013-09-04
山东宝纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN200610155655.1 uses a vacuum pressureless sintering method and uses yttrium oxide as a sintering aid to make an aluminum nitride-reinforced silicon carbide material, but this patent does not have research on thermal conductivity
Although there have been many literature reports on SiC-AlN composite phase ceramics, more studies are on mechanical properties, and less on thermal conductivity, and most of the preparation methods are hot pressing and pressureless sintering. There are no patents and literature reports on the preparation of high thermal conductivity SiC-AlN ceramic composites by reaction sintering method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing SiC-AlN ceramic composite material with high thermal conductivity, the steps are as follows, all in parts by weight:

[0047] (1) Weigh 50 parts of D 50 2.5μm silicon carbide powder, 23 parts D 50 10μm silicon carbide powder, 7 parts D 50 30μm silicon carbide powder, 10 parts D 50 1μm aluminum nitride powder, 7 parts D 50 After mixing 0.5 μm carbon powder, 1.5 parts of stearic acid, 1 part of tetramethylammonium hydroxide, and 0.5 part of polyvinyl alcohol, add 80 parts of deionized water, and use silicon carbide ball stone as the grinding medium. Ball milling in a nylon liner ball mill jar for 4.5 hours to prepare SiC-AlN composite matrix slurry;

[0048] (2) Spray granulate the SiC-AlN composite matrix slurry prepared in step (1), control the moisture content of the granulated powder at 0.2~0.4%; Hold the pressure for 3 minutes to obtain a green body with a density of 1.88g / cm 3 , to obtain a high-density green body;

[0049] (3) The high...

Embodiment 2

[0052] A method for preparing SiC-AlN ceramic composite material with high thermal conductivity, the steps are as follows, all in parts by weight:

[0053] (1) Weigh 45 parts of D 50 4μm silicon carbide powder, 15 parts D 50 13μm silicon carbide powder, 7 parts D 50 25μm silicon carbide powder, 20 parts D 50 3.5μm aluminum nitride powder, 10 parts D 50 After mixing 0.5 μm carbon powder, 1.5 parts of fatty acid glyceride, 1 part of polyacrylic acid and 0.5 part of carboxymethyl cellulose, add 100 parts of deionized water, use silicon carbide ball stone as the grinding medium, and grind on nylon Ball milling in the liner ball milling tank for 4 hours to prepare SiC-AlN composite matrix slurry;

[0054] (2) Spray granulate the SiC-AlN composite matrix slurry prepared in step (1), control the moisture content of the granulated powder at 0.2~0.4%; Hold the pressure for 3 minutes to obtain a green body with a density of 1.91g / cm 3 , to obtain a high-density green body;

[005...

Embodiment 3

[0058] A method for preparing SiC-AlN ceramic composite material with high thermal conductivity, the steps are as follows, all in parts by weight:

[0059] (1) Weigh 43 parts of D 50 2.5μm silicon carbide powder, 13 parts D 50 15μm silicon carbide powder, 6 parts D 50 30μm silicon carbide powder, 25 parts D 50 2μm aluminum nitride powder, 10 parts D 50 After mixing 0.5 μm carbon powder, 1.5 parts of stearic acid, 1 part of polyacrylic acid, and 0.5 parts of polyvinyl alcohol, add 100 parts of deionized water, use silicon carbide ball stone as the grinding medium, and grind in the nylon liner Ball milling in a ball mill tank for 3.5 hours to prepare SiC-AlN composite matrix slurry;

[0060] (2) Spray granulate the SiC-AlN composite matrix slurry prepared in step (1), control the moisture content of the granulated powder at 0.2~0.4%; Hold the pressure for 3 minutes to obtain a green body with a density of 1.92g / cm 3 , to obtain a high-density green body;

[0061] (3) The ...

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Abstract

The invention relates to a SiC (silicon carbide)-AlN (aluminium nitride) composite material and a preparation method thereof. The SiC-AlN composite material is prepared from the following raw materials in mass percent: 50% to 80% of SiC, 5% to 30% of AlN, 5% to 15% of powdered carbon, 1% to 3% of surface active agent, 0.5% to 2.5% of dispersing agent, and 0.3% to 1.5% of adhesion agent. The preparation method comprises the steps of mixing, forming and sintering the raw materials. As being prepared by adding the AlN in the SiC material, the SiC-AlN composite material has the advantages of higher hardness than the common silicon carbide materials, low thermal expansion coefficient, high heat conductivity and the like, and has wide application prospect in the field of industrial stoves, petroleum, metallurgy, chemical industry, machinery, aeronautics and astronautics, etc.

Description

technical field [0001] The invention relates to a SiC-AlN ceramic composite material with high thermal conductivity and a preparation method thereof, belonging to the field of inorganic non-metallic materials. Background technique [0002] Silicon carbide ceramics have high hardness, high temperature resistance, oxidation resistance, corrosion resistance, high temperature strength, high decomposition temperature (higher than 2400°C), good chemical stability, good thermal shock resistance, high thermal conductivity, and low thermal expansion coefficient It is widely used in industrial furnaces, petroleum, metallurgy, chemical industry, machinery, aerospace and many other fields, especially the excellent thermodynamic properties of silicon carbide ceramics make it suitable for use in heat exchangers, heat storage combustion, etc. It has broad application prospects in occasions with high thermal performance requirements. [0003] However, the current silicon carbide materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 张玉军李兆敏李其松孙海滨
Owner 山东宝纳新材料有限公司