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Method for preparing silicon carbide/molybdenum disilicide composite ceramic through reaction sintering

A technology of composite ceramics and molybdenum disilicide, which is applied in the field of reaction sintering to prepare silicon carbide/molybdenum disilicide composite ceramics, achieving good mechanical properties, low sintering temperature, and extended application

Inactive Publication Date: 2016-11-16
浙江东新新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies did not start from the perspective of the oxidation resistance of reaction sintered silicon carbide ceramics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering, the following steps are carried out in sequence:

[0020] A. Preparation of main raw materials:

[0021] Mix 65 parts of silicon carbide powder, 15 parts of molybdenum powder, and 20 parts of graphite powder as the main raw materials;

[0022] B, after the main raw materials are uniformly mixed, add 4 parts of polyvinyl alcohol as a binder, 1.5 parts of tetramethylammonium hydroxide as a dispersant, mechanical ball milling to prepare silicon carbide composite powder (can pass through a 100-mesh sieve);

[0023] That is, polyvinyl alcohol accounts for 4.0% of the main raw material gross weight, and tetramethylammonium hydroxide accounts for 1.5% of the main raw material gross weight;

[0024] C. Placing the granulated powder (i.e., the silicon carbide composite powder obtained in step B) in a mold and forming it once by dry pressing (with a pressure of 50...

Embodiment 2

[0027] Embodiment 2, a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering,

[0028] Mix 65 parts of silicon carbide powder, 10 parts of molybdenum powder, and 25 parts of graphite powder as the main raw materials;

[0029] The weight ratio of green body to metal silicon wafer is 1:3.0;

[0030] The rest are equal to Example 1.

[0031] The bulk density of the obtained silicon carbide / molybdenum disilicide composite ceramics is 2.7-3.0g / cm 3 , the flexural strength is greater than 150MPa, the elastic modulus is above 50GPa, and the oxidation resistance is above 1450°C.

Embodiment 3

[0032] Embodiment 3, a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering,

[0033] Mix 60 parts of silicon carbide powder, 15 parts of molybdenum powder, and 25 parts of graphite powder as the main raw materials;

[0034] The weight ratio of green body to metal silicon wafer is 1:3.5;

[0035] The rest are equal to Example 1.

[0036] The bulk density of the obtained silicon carbide / molybdenum disilicide composite ceramics is 2.9-3.15g / cm 3 , the flexural strength is greater than 250MPa, the elastic modulus is above 80GPa, and the oxidation resistance is above 1550°C.

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Abstract

The invention discloses a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering. ~15% molybdenum, 15%~25% graphite; B. After mixing the main raw materials evenly, add polyvinyl alcohol as a binder and tetramethylammonium hydroxide as a dispersant, and prepare silicon carbide composite by mechanical ball milling powder; C, placing the granulated powder in a mold and forming it once by dry pressing to obtain a green body; D, placing the above-mentioned green body on a graphite plate, and then placing a metal silicon chip on the green body, and the green body The weight ratio to the metal silicon sheet is 1:2.5-3.5, and the silicon carbide / molybdenum disilicide composite ceramic is obtained by high-temperature silicon infiltrating sintering at 1500-1600°C for 3-6 hours.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide / molybdenum disilicide composite ceramics by reaction sintering. Background technique [0002] Reaction sintered silicon carbide is made of fine particles of α-SiC and additives pressed into a green body, which is in contact with liquid silicon at high temperature. The carbon in the green body reacts with the infiltrated Si to form β-SiC, which is combined with α-SiC. The free silicon fills the pores, resulting in a highly dense ceramic material. The density of this sintered silicon carbide can reach 3.08g / cm 3 , the size of the product is almost unchanged before and after sintering, so it can be processed into any shape and size after molding, especially suitable for large-scale and complex-shaped products. The production process of reaction sintered silicon carbide is simple, the cost is low, and the application fields are very wide. However, since the product generally contains 8% to ...

Claims

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Application Information

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IPC IPC(8): C04B35/565
CPCC04B35/565C04B2235/3891C04B2235/425C04B2235/77
Inventor 郭兴忠杨辉郑浦高黎华
Owner 浙江东新新材料科技有限公司
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