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Hot-pressed liquid-phase sintered boron carbide composite ceramic and preparation method thereof

A composite ceramic and liquid phase sintering technology, applied in the field of ceramic materials, can solve the problems of high preparation cost, high sintering temperature, difficult densification, etc., and achieve the effects of inhibiting grain growth, low sintering temperature, and good high temperature performance.

Pending Publication Date: 2022-06-28
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for preparing boron carbide ceramics, which can improve the problems of traditional sintered boron carbide ceramics such as high brittleness, low strength, difficulty in densification, high sintering temperature and high preparation cost

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  • Hot-pressed liquid-phase sintered boron carbide composite ceramic and preparation method thereof

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preparation example Construction

[0027] The embodiment of the present invention discloses a hot-pressed liquid-phase sintered boron carbide composite ceramic and a preparation method thereof. The preparation method includes the following steps:

[0028] S1. Weigh the raw materials, including by mass percentage: boron carbide powder 69-81wt%, titanium carbide powder 6-10wt%, sintering aid 8-10wt%, dispersant 0.3-0.5wt%, binder 3-5wt% %, plasticizer 2-5wt%.

[0029] The sintering aid is any combination of alumina, alumina and yttria, alumina and carbon black. When the combination of alumina and yttrium oxide is selected as the sintering aid, the mass ratio of alumina and yttrium oxide is controlled to be 1.5-1.7; when the combination of alumina and carbon black is selected as the sintering aid, the mass ratio of alumina and carbon black is controlled to be 5-12.

[0030] Control the particle size of boron carbide powder, titanium carbide powder and sintering aid powder, particle size of boron carbide powder D...

Embodiment 1

[0037] The raw materials are weighed, including 80.7 parts of boron carbide powder, 6 parts of titanium carbide powder, 8 parts of alumina, 0.3 parts of tetramethylammonium hydroxide, 5 parts of polyvinyl alcohol, and 5 parts of glycerin. The particle size of boron carbide powder is D50=0.3um, the particle size of titanium carbide is D50=1um, and the particle size of alumina powder is D50=0.4um.

[0038]Mix the above raw materials, use the method of ball milling and slurrying, use boron carbide ceramic balls as the medium balls during ball milling, the ball diameter is 5-10mm, add the raw materials and deionized water, and the quality of the medium balls: boron carbide powder, titanium carbide powder and Sintering aid mass sum: deionized water mass = 2:1:1, drum ball milling for 72h, and then spray granulation.

[0039] The green body is pre-pressed, and the pre-compression molding pressure is 10Mpa, and then the green body is placed in a graphite mold for hot pressing and sin...

Embodiment 2

[0042] Weigh the raw materials, including 78.6 parts of boron carbide powder, 8 parts of titanium carbide powder, 5 parts of alumina, 3 parts of yttrium oxide, 0.4 parts of tetramethylammonium hydroxide, 3 parts of hydroxymethyl cellulose, 2 parts of polyethylene glycol . The particle size of boron carbide powder is D50=0.5um, the particle size of titanium carbide is D50=0.5um, the particle size of alumina is D50=0.4um, and the particle size of yttrium oxide is D50=1um.

[0043] Mix the above raw materials, use the method of ball milling and slurrying, use boron carbide ceramic balls as the medium balls during ball milling, the ball diameter is 5-10mm, add the raw materials and deionized water, and the quality of the medium balls: boron carbide powder, titanium carbide powder and Sintering aid mass sum: deionized water mass = 2:1:1, drum ball milling for 72h, and then spray granulation.

[0044] The green body is pre-pressed, and the pre-press molding pressure is 12Mpa, and t...

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Abstract

The invention provides hot-pressed liquid-phase sintered boron carbide composite ceramic and a preparation method thereof.The preparation method comprises the following steps that raw materials are weighed, and the raw materials comprise, by mass, 69-81 wt% of boron carbide powder, 6-10 wt% of titanium carbide powder, 8-10 wt% of a sintering aid, 0.3-0.5 wt% of a dispersing agent, 3-5 wt% of a binder and 2-5 wt% of a plasticizer; uniformly mixing the raw materials, and performing spray granulation; the preparation method comprises the following steps: pre-pressing into a green body, and carrying out hot pressed sintering at the sintering temperature of 1840-1900 DEG C under the sintering pressure of 25-30 MPa to obtain the boron carbide composite ceramic. According to the preparation method, a process scheme of in-situ reaction and hot-pressed sintering of the liquid-phase sintering aid is adopted, the preparation method has the advantages of simplicity and convenience in operation, low production cost and high efficiency, the in-situ reaction and the liquid-phase hot-pressed sintering are synergistically reinforced, the high-strength and high-performance boron carbide composite ceramic can be prepared, and the preparation method has a very good application prospect.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a hot-pressed liquid-phase sintered boron carbide composite ceramic and a preparation method thereof. Background technique [0002] Boron carbide is an engineering ceramic material with excellent performance. It has the advantages of high strength, high hardness and low density, as well as corrosion resistance, wear resistance and excellent neutron absorption capacity. It is used in high-tech fields such as electronics, aerospace, and military industries. Has a very good application prospect. [0003] However, due to the inherent characteristics of boron carbide, it is mostly composed of covalent bonds, and the covalent bond index is as high as 93.94%, which makes the ceramic lack of slip system, densification is difficult, the material is brittle, low in toughness and low in strength, and the existing technology The production of boron carbide generally adopts the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/645
CPCC04B35/563C04B35/622C04B35/645C04B2235/3843C04B2235/3217C04B2235/3225C04B2235/424C04B2235/6562C04B2235/6567C04B2235/96C04B2235/3813
Inventor 程向前谢方民洪于喆邬国平郭岱东熊礼俊于明亮戚明杰蔡宁宁杨连江方友祥沈赟邹东平
Owner NINGBO VULCAN TECH CO LTD