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A boron carbide-silicon carbide composite ceramic with simple powder as starting material and preparation method thereof

A technology of composite ceramics and boron carbide, which is applied in the field of high toughness, high hardness boron carbide-silicon carbide composite ceramics and its preparation, can solve the problem of reduced hardness of boron carbide-silicon carbide composite ceramics, lack of intragranular crystal structure, and lack of performance Find out the advantages of boron carbide-silicon carbide composite ceramics and other issues, and achieve the effect of improving fracture toughness

Inactive Publication Date: 2019-02-05
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method uses the compounds boron carbide and silicon carbide as raw materials, and the boron carbide-silicon carbide composite ceramics prepared do not have an intragranular crystal structure. In addition, although this method adds a sintering aid, it still requires a high temperature of 1700-200 ° C; Moreover, due to the presence of sintering aids, the hardness of boron carbide-silicon carbide composite ceramics is reduced and the performance is unstable. Such products do not give full play to the advantages that boron carbide-silicon carbide composite ceramics should have, and can only meet daily applications and are not easy to use. in precision structural engineering

Method used

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  • A boron carbide-silicon carbide composite ceramic with simple powder as starting material and preparation method thereof
  • A boron carbide-silicon carbide composite ceramic with simple powder as starting material and preparation method thereof
  • A boron carbide-silicon carbide composite ceramic with simple powder as starting material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] A boron carbide-silicon carbide composite ceramic with intergranular-intragranular composite toughening structure, including 90% boron carbide and 10% silicon carbide by weight percentage, the composite ceramic is composed of 70.7wt% boron powder, 22.3 The carbon powder of wt% and the silicon powder of 7wt% are sintered by spark plasma sintering technology after mechanochemical process, and its preparation method comprises the following steps:

[0039] 1. By weight percentage, weigh 70.7% of boron powder (particle size is 40um, purity is 99%), silicon powder 7% (particle size is 200um, purity 99%), carbon powder 22.3% (particle size is 200um, purity 98%) , the weighed boron powder, carbon powder and silicon powder are mechanochemically treated by a planetary ball mill. The ball:material mass ratio is 10:1, the ball mill speed is 200rpm, and the ball mill is 24 hours. ;Then the obtained powder was stirred with 2mol / L hydrochloric acid solution at 40°C for 6h, then suctio...

Embodiment 2

[0043] A boron carbide-silicon carbide composite ceramic with intergranular-intragranular composite toughening structure, including 90% boron carbide and 10% silicon carbide by weight percentage, the composite ceramic is composed of 70.7wt% boron powder, 22.3 The carbon powder of wt% and the silicon powder of 7wt% are sintered by spark plasma sintering technology after mechanochemical process, and its preparation method comprises the following steps:

[0044] 1. By weight percentage, take boron powder 70.7% (particle size is 1um, purity is 98%), silicon powder 7% (particle size is 3um, purity 99%), carbon black 22.3% (particle size is 0.1um, purity 98%) ), the boron powder, carbon powder and silicon powder weighed are carried out mechanochemical treatment by planetary ball mill, ball: material mass ratio is 20:1, ball mill speed is 300rpm, ball mill 12h, whole ball mill process is carried out in argon atmosphere ;Then the powder obtained by ball milling was stirred in 2mol / L h...

Embodiment 3

[0048] The difference between this example and Example 2 is that the mass percentages of boron carbide and silicon carbide in the prepared boron carbide-silicon carbide composite ceramics are 70% and 30%, and the composite ceramics are composed of 55wt% boron powder, 24wt% Carbon powder and 21wt% silicon powder are sintered by spark plasma sintering technology after mechanochemical process.

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Abstract

The invention relates to boron carbide-silicon carbide composite ceramic with simple substance powder as a starting material and of an intergranular-transgranular composite toughening structure and a low-temperature quick preparation method of the ceramic, and belongs to the technical field of ceramic materials. The preparation method includes the steps that after three-element simple substance powder composed of boron powder, carbon powder and silicon powder is subjected to mechanical and chemical process, the powder is quickly sintered at low temperature through the spark plasma sintering technology, and the ceramic is obtained, wherein the mass ratio of boron carbide to silicon carbide in the obtained composite ceramic is 9:1-1:9. The prepared boron carbide-silicon carbide composite ceramic has high compactness and has the intergranular-transgranular composite toughening structure, and the special structure can greatly improve fracture toughness of a ceramic matrix. Thus, the boron carbide-silicon carbide composite ceramic high in hardness and toughness can be quickly prepared at low temperature, and the defects that boron carbide-silicon carbide composite ceramic is too high in sintering temperature and hardness and toughness are difficult to improve at the same time are overcome.

Description

technical field [0001] The invention relates to a ceramic composite material and a preparation method thereof, in particular to a high-toughness, high-hardness boron carbide-silicon carbide composite ceramic with an intergranular-intragranular composite toughening structure and a preparation method thereof. Background technique [0002] In addition to high melting point, high elastic modulus, low expansion coefficient, excellent wear resistance and excellent chemical corrosion resistance, boron carbide-silicon carbide composite ceramics have the most outstanding advantages of high hardness and low density. (Because both boron carbide and silicon carbide are low-density, high-hardness materials), this is unmatched by other composite ceramics, making it have important application value in the fields of wear-resistant ceramic parts, aerospace materials and national defense construction. One of the key new materials that urgently needs to be developed. However, since both boron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/565C04B35/64C04B35/626
CPCC04B35/563C04B35/565C04B35/6261C04B35/64C04B2235/656C04B2235/658C04B2235/666
Inventor 张志晓张晓荣王为民傅正义何强龙王爱阳
Owner HEBEI UNIV OF ENG