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Graphene-reinforced silicon-boron-carbon-nitrogen ceramic composite material and preparation method thereof

A ceramic composite material, silicon boron carbon nitrogen technology, applied in the field of graphene reinforced silicon boron carbon nitrogen ceramic composite material and its preparation, can solve the problems of poor toughness, unknown thermal shock and ablation mechanism, low strength, etc., easy to achieve The effect of obtaining, low price and low preparation cost

Inactive Publication Date: 2015-04-22
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention provides a graphene-enhanced silicon-boron-carbon-nitrogen ceramic composite material and its preparation method to solve the problems of low strength, poor toughness, thermal shock and unknown ablation mechanism of the existing silicon-boron-carbon-nitrogen ceramic composite material

Method used

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  • Graphene-reinforced silicon-boron-carbon-nitrogen ceramic composite material and preparation method thereof
  • Graphene-reinforced silicon-boron-carbon-nitrogen ceramic composite material and preparation method thereof
  • Graphene-reinforced silicon-boron-carbon-nitrogen ceramic composite material and preparation method thereof

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specific Embodiment approach 1

[0030] Specific embodiment 1: The graphene reinforced silicon boron carbon nitride ceramic composite material of this embodiment is made of 90 to 99 parts of SiBCN amorphous powder and 1 to 10 parts of graphene by volume;

[0031] The SiBCN amorphous powder is made of silicon powder, graphite and hexagonal boron nitride; wherein the molar ratio of Si element to C element in the SiBCN amorphous powder is 2: (2.5 to 3.5), wherein The molar ratio of Si element to B element in SiBCN amorphous powder is 2:(0.5~1.5).

[0032] The silicon powder crystal form described in this embodiment is cubic, and is a commercially available product.

[0033] The graphene preparation process described in this embodiment is as follows:

[0034] ① Add concentrated sulfuric acid with a mass concentration of 98% into a dry Erlenmeyer flask, add graphite and solid sodium nitrate under the conditions of a low temperature ice bath at a temperature of 0 to 4°C and a stirring speed of 500r / min to 1000r / min. Conti...

specific Embodiment approach 2

[0051] Specific embodiment two: This embodiment is different from the specific embodiment one in that the purity of the silicon powder is 99%-99.9%. The other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0052] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the purity of the graphite is 99% to 99.9%. The other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention relates to a graphene-reinforced silicon-boron-carbon-nitrogen ceramic composite material and a preparation method thereof. The invention aims to solve the problems of low strength, poor ductility and uncertain thermal shock and ablation mechanisms in the existing silicon-boron-carbon-nitrogen ceramic composite material. The product is prepared from 90-99 parts by volume of SiBCN amorphous powder and 1-10 parts by volume of graphene. The method comprises the following steps: 1. adding silicon powder, graphite and hexagonal boron nitride into a ball mill, and carrying out ball milling in an argon protective atmosphere to obtain SiBCN amorphous powder; 2. uniformly mixing the SiBCN amorphous powder and graphene by ball milling to obtain mixed powder; and 3 carrying out discharge plasma sintering on the mixed power to obtain the graphene-reinforced silicon-boron-carbon-nitrogen ceramic composite material.

Description

Technical field [0001] The invention relates to a graphene reinforced silicon-boron-carbon-nitrogen ceramic composite material and a preparation method thereof. Background technique [0002] In recent years, SiBCN composite ceramics have attracted the attention of researchers due to their superior high temperature stability and good mechanical properties. Such composite materials can even satisfy <2000℃ use requirements, showing good application prospects. The SiBCN composite ceramic prepared by the cracking method of some organic polymer precursors has superior performance. An article reported that the SiBCN ceramic prepared by this method can still maintain the amorphous state of the matrix when heated to 1700 ℃ under argon conditions. The temperature of irreversible damage to the ceramic structure reaches 2000℃. Under certain experimental conditions, the SiBCN3 fiber with room temperature strength up to 4.0 GPa was prepared. When heated from room temperature to 1400 ℃, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 杨治华李达鑫贾德昌周玉梁斌王胜金蔡德龙
Owner HARBIN INST OF TECH
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