Boron carbide silicon carbide composite ceramic and preparation method thereof

A technology of boron carbide silicon carbide and composite ceramics, which is applied in the field of ceramic materials, can solve the problems of reducing the hardness of products and its high-temperature mechanical properties, difficult to use precision structural engineering, and poor high-temperature mechanical properties, etc., and meets the requirements of fine grain and particle size Good effect of low and high temperature mechanical properties

Inactive Publication Date: 2013-04-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the preparation methods involved in the above patents, if Si is used as an infiltration agent for vacuum infiltration, a large amount of Si elemental remains in the product, which reduces the hardness and high-temperature mechanical properties of the product. In addition, the product prepared by this method , the distribution of the two phases is uneven, resulting in unstable per

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  • Boron carbide silicon carbide composite ceramic and preparation method thereof
  • Boron carbide silicon carbide composite ceramic and preparation method thereof
  • Boron carbide silicon carbide composite ceramic and preparation method thereof

Examples

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Example Embodiment

[0036] Example 1

[0037] A boron carbide silicon carbide composite ceramic, the mass ratio of boron carbide to silicon carbide in the boron carbide silicon carbide composite ceramic is 4:1, which consists of a ternary mixed powder of boron carbide, amorphous carbon powder and silicon powder through mechanical After alloying, it is sintered by reactive hot pressing technology. According to the weight percentage, the ternary mixed powder includes 80% boron carbide powder (purity 97%, particle size 75um), amorphous carbon powder 6 % (Purity is 98%, particle size is 1um), silicon powder 14% (purity is 99%, particle size is 75um).

[0038] The method for preparing the boron carbide silicon carbide composite ceramics of this embodiment, the specific steps include:

[0039] 1) Preparation of amorphous high-activity boron carbide, carbon and silicon composite powder

[0040] ①According to weight percentage, weigh boron carbide powder with a purity of 97% and a particle size of 75um; an amo...

Example Embodiment

[0048] Example 2

[0049] A boron carbide silicon carbide composite ceramic, the mass ratio of boron carbide to silicon carbide in the boron carbide silicon carbide composite ceramic is 4:1, which is mechanically alloyed by a ternary mixed powder of boron carbide, carbon black and silicon powder Then, it is sintered by reactive hot pressing technology. The ternary mixed powder according to weight percentage includes 80% of boron carbide powder (purity of 97%, particle size of 75um), carbon black 6% (purity of 98%, particle size is 1um), silicon powder 14% (purity is 99%, particle size is 75um).

[0050] The method for preparing the boron carbide silicon carbide composite ceramics of this embodiment, the specific steps include:

[0051] 1) Preparation of amorphous high-activity boron carbide, carbon and silicon composite powder

[0052] ①Weigh boron carbide powder with a purity of 97% and a particle size of 75um; carbon black with a purity of 98% and a particle size of 1um; silicon p...

Example Embodiment

[0058] Example 3

[0059] The difference between this embodiment and Embodiment 2 is that the weight percentages of boron carbide powder, carbon black and silicon powder are 90%, 3% and 7%.

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Abstract

The invention relates to a method for preparing boron carbide silicon carbide composite ceramic and belongs to the technical field of ceramic materials. The boron carbide silicon carbide composite ceramic is prepared by mechanically alloying three-element mixed powder of boron carbide, carbon powder and silicon powder and sintering by a reaction hot-pressing technology, wherein the three-element mixed powder comprises 50 to 90 weight percent of boron carbide powder, 15 to 3 weight percent of carbon powder and 35 to 7 weight percent of silicon powder; and the molar ratio of the carbon powder to the silicon powder is 0.8 to 1.2. The high-compactness boron carbide silicon carbide composite ceramic can be obtained at low temperature without adding a liquid phase sintering aid. Silicon carbide which is obtained through in-situ synthesis in the sintering process of carbon and silicon has high purity and the crystal grains are small and dispersed uniformly, so the mechanical property of the ceramic is improved. The boron carbide silicon carbide composite ceramic prepared by the method has high compactness, high hardness and high high-temperautre mechanical property and can serve as an anti-impact and wear-resistant part of precise structure engineering.

Description

technical field [0001] The invention relates to a composite ceramic material and a preparation method thereof, in particular to a boron carbide silicon carbide composite ceramic and a preparation method thereof, belonging to the technical field of ceramic materials. Background technique [0002] Boron carbide (B 4 C) It is a superhard material whose hardness is second only to diamond and cubic boron nitride. It has high melting point, low density, excellent wear resistance, excellent chemical stability and high neutron absorption capacity. It is widely used in military protection, nuclear power plant, chemical industry and aerospace fields. but B 4 C is a ceramic material with strong covalent bonds. Covalent bonds account for 93.9%, and its plasticity is poor, the grain boundary movement resistance is large, and the surface tension is very small in solid state, so boron carbide sintering is very difficult. In addition, the fracture toughness and strength of boron carbide ...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/78C04B35/622
Inventor 王为民张志晓杜贤武傅正义
Owner WUHAN UNIV OF TECH
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