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Preparation method of high-density silicon carbide ceramic composite material

A technology of silicon carbide ceramics and composite materials, applied in ceramic molding machines, manufacturing tools, etc., can solve the problems of pressure sintering and high energy consumption, not suitable for preparing special-shaped parts, and high production costs, and achieve improved mechanical properties, high hardness, The effect of fast densification

Inactive Publication Date: 2021-01-29
段深圳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hot pressing sintering and hot isostatic pressing sintering silicon carbide have higher performance, and their density and strength are usually higher than normal pressure sintering, but in the sintering process, it is also necessary to add B, C, etc. High cost, not suitable for preparing special-shaped parts
In summary, the high-cost pressure sintering and high energy consumption of the above method greatly limit the production and application of silicon carbide ceramic products

Method used

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  • Preparation method of high-density silicon carbide ceramic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a high-density silicon carbide ceramic composite material, comprising the following steps: S1, silicon carbide powder (purity ≥ 98.5%, particle size 2 、CrSi 2 (purity ≥ 99.6wt%, average particle size 2-5µm) and Re 2 o 3 (purity ≥ 99.5%, average particle size 0.8 ~ 1μm) composition, and the mixture of LiAlO 2 、CrSi 2 and Re 2 o 3 The mass ratio is 2:1.5:1, LiAlO 2 by adding Li at a molar ratio of 1.01:1 2 CO 3 and active α-Al 2 o 3 It is obtained by calcining at 1000°C after wet ball milling;

[0029] S2: Put the obtained mixed powder into a pressing mold, adopt a cold isostatic pressing molding process at a pressure of 150MPa for 10 minutes, and obtain a density of 1.79g / cm 3 of blanks.

[0030] S3: Place the obtained biscuit in a sintering furnace for pressureless vacuum sintering, firstly raise the temperature to 1100°C at 10°C / min, keep it for 1h, then raise the temperature to 1850°C at 12°C / min, keep it for 2h, cool down after sinte...

Embodiment 2

[0034] A method for preparing a high-density silicon carbide ceramic composite material, comprising the following steps: S1, silicon carbide powder (purity ≥ 98.5%, particle size 2 、CrSi 2 (purity ≥ 99.6wt%, average particle size 2-5µm) and Re 2 o 3 (purity ≥ 99.5%, average particle size 0.8 ~ 1μm) composition, and the mixture of LiAlO 2 、CrSi 2 and Re 2 o 3 The mass ratio is 3:1.5:1, LiAlO 2 by adding Li at a molar ratio of 1.01:1 2 CO 3 and active α-Al 2 o 3 It is obtained by calcining at 1000°C after wet ball milling;

[0035] S2: Put the obtained mixed powder into a pressing mold, adopt a cold isostatic pressing molding process with a pressure of 150MPa for 12 minutes, and obtain a density of 1.82g / cm 3 of blanks.

[0036] S3: Place the obtained biscuit in a sintering furnace for pressureless vacuum sintering, firstly raise the temperature to 1200°C at 12°C / min, keep it for 2h, then raise the temperature to 1950°C at 10°C / min, keep it for 2h, cool down after sin...

Embodiment 3

[0039] A method for preparing a high-density silicon carbide ceramic composite material, comprising the following steps: S1, silicon carbide powder (purity ≥ 98.5%, particle size 2 、CrSi 2 (purity ≥ 99.6wt%, average particle size 2-5µm) and Re 2 o 3 (purity ≥ 99.5%, average particle size 0.8 ~ 1μm) composition, and the mixture of LiAlO 2 、CrSi 2 and Re 2 o 3 The mass ratio of LiAlO is 1.5:1.5:1, 2 by adding Li at a molar ratio of 1.01:1 2 CO 3 and active α-Al 2 o 3 It is obtained by calcining at 1000°C after wet ball milling;

[0040] S2: Put the obtained mixed powder into a pressing mold, adopt a cold isostatic pressing molding process with a pressure of 200MPa for 5 minutes, and obtain a density of 1.76g / cm 3 the blank;

[0041] S3: Place the obtained biscuit in a sintering furnace for pressureless vacuum sintering, firstly raise the temperature at 8°C / min to 1000°C, keep it for 1h, then raise the temperature at 10°C / min to 1850°C, keep it for 3h, cool down after ...

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Abstract

The invention discloses a preparation method of a high-density silicon carbide ceramic composite material. The preparation method comprises the following steps of: S1, putting silicon carbide powder,carbon black, boron nitride nanosheets and a combustion assistant into a grinder, carrying out wet ball-milling mixing, drying, and screening to obtain mixed powder; S2, carrying out compression molding on the mixed powder by adopting a cold isostatic pressing molding process to obtain a biscuit; S3, performing pressureless vacuum sintering on the biscuit so as to obtain a presintered body; and S4, performing spark plasma sintering on the presintered body to obtain the silicon carbide ceramic composite material. According to the preparation method, wet ball-milling mixing is performed on the raw materials in a reasonable ratio to obtain the mixed powder; compression molding is performed on the mixed powder by adopting the cold isostatic pressing process to obtain the biscuit with relatively high density; and the biscuit issintered through a pressureless sintering and spark plasma sintering combined manner; and therefore, the preparation of the high-density, high-hardness and high-strength silicon carbide ceramic composite material is realized. The method is simple in process and convenient for industrial production.

Description

technical field [0001] The invention relates to the technical field of silicon carbide ceramic materials, in particular to a method for preparing a high-density silicon carbide ceramic composite material. Background technique [0002] The outstanding advantages of ceramic composite materials are light weight, high temperature resistance, oxidation resistance and corrosion resistance. They play an irreplaceable role as high temperature structural materials. With the development of design and preparation technology, their applications are also being applied to automobile engines and high-power internal combustion engines. and other areas of development. Among them, silicon carbide ceramics can also be used as bulletproof armor materials, space mirrors, and semiconductor wafers due to their excellent high-temperature mechanical strength, high hardness, high elastic modulus, high wear resistance, high thermal conductivity, and corrosion resistance. Clamp material and nuclear fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/64B28B3/00
CPCB28B3/003C04B35/565C04B35/64C04B2235/3222C04B2235/3224C04B2235/386C04B2235/3891C04B2235/424C04B2235/5436C04B2235/5454C04B2235/608C04B2235/6562
Inventor 段深圳
Owner 段深圳
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