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High-hardness ceramic composite material of boron carbide-titanium boride-silicon carbide and preparation method thereof

A ceramic composite material and silicon carbide technology are applied in the field of boron carbide-titanium boride-silicon carbide high-hardness ceramic composite materials and their preparation, which can solve the problems that the hardness and toughness are difficult to improve at the same time, and the sintering temperature is high, and achieve fine grain size. , The effect of low sintering temperature and improved toughness

Inactive Publication Date: 2014-05-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a boron carbide-titanium boride-silicon carbide high-hardness ceramic composite material and its preparation method in view of the shortcomings of the existing boron carbide-based composite ceramic materials, such as high sintering temperature and difficulty in simultaneously improving hardness and toughness

Method used

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  • High-hardness ceramic composite material of boron carbide-titanium boride-silicon carbide and preparation method thereof
  • High-hardness ceramic composite material of boron carbide-titanium boride-silicon carbide and preparation method thereof
  • High-hardness ceramic composite material of boron carbide-titanium boride-silicon carbide and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035]A boron carbide-titanium boride-silicon carbide high-hardness ceramic composite material is composed of 85%, 8.1% and 6.9% by mass of boron carbide, titanium boride and silicon carbide. It is sintered by ternary mixed powder of boron carbide, titanium carbide and silicon powder through reaction hot pressing technology. The ternary mixed powder includes 88.2% boron carbide powder (purity is 98% , with an average particle size of 0.8 μm), titanium carbide 6.9% (purity 97%, average particle size 1 μm), silicon powder 4.9% (purity 99%, average particle size 0.6 μm).

[0036] The preparation method of boron carbide-titanium boride-silicon carbide high-hardness ceramic composite material described in this embodiment, the specific steps include:

[0037] ①Weigh 88.2% of boron carbide powder, 6.9% of titanium carbide, and 4.9% of silicon powder by weight percentage;

[0038] ② Put the weighed powder into the ball mill tank of the planetary ball mill, add ethanol as the dispersi...

Embodiment 2

[0044] A boron carbide-titanium boride-silicon carbide high-hardness ceramic composite material is composed of boron carbide, titanium boride and silicon carbide with mass percentages of 90%, 5.4% and 4.6%. It is sintered by ternary mixed powder of boron carbide, titanium boride and silicon powder through reaction hot pressing technology. The ternary mixed powder of raw materials is calculated by weight percentage, including boron carbide powder 92.2% 96%, the average particle size is 3μm), titanium carbide 4.6% (purity is 97%, average particle size is 1μm), silicon powder is 3.2% (purity is 99%, average particle size is 2μm).

[0045] The preparation method of boron carbide-titanium boride-silicon carbide high-hardness ceramic composite material described in this embodiment, the specific steps include:

[0046] ① Weigh 92.2% of boron carbide powder, 4.6% of titanium carbide, and 3.2% of silicon powder by weight percentage;

[0047] ② Put the weighed powder into the ball mill...

Embodiment 3

[0052] The difference between this example and Example 2 is that the mass percentages of boron carbide, titanium boride and silicon carbide in the boron carbide-titanium boride-silicon carbide high-hardness ceramic composite material are 80%, 10.8%, 9.2% %.

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Abstract

The invention relates to a high-hardness ceramic composite material of boron carbide-titanium boride-silicon carbide and a preparation method thereof, and belongs to the technical field of a ceramic material. The composite ceramic is prepared from boron carbide, silicon carbide and silicon powder in a hot-pressing sintering manner via reaction. The composite ceramic contains 50-90wt% of boron carbide, 27-5.4wt% of titanium boride and 23-4.6wt% of silicon carbide. The defects of overhigh sintering temperature, and difficulty of improvement of the toughness and the hardness at the same time of the existing boron carbide ceramic are solved; carbon generated by reaction of the boron carbide and the titanium boride is removed by monatomic silicon; and the carbon for reducing the hardness of the base material is converted into hard material silicon carbide which is evenly dispersed, so as to play roles in enhancing the toughness and improving the material hardness. The high-toughness boron carbide composite ceramic can be prepared at low temperature on the premise of not reducing the hardness of a base body.

Description

technical field [0001] The invention relates to a ceramic composite material and a preparation method thereof, in particular to a boron carbide-titanium boride-silicon carbide high-hardness ceramic composite material and a preparation method thereof. Background technique [0002] Boron carbide is a superhard material whose hardness is second only to diamond and cubic boron nitride. In addition, boron carbide has a high melting point, low density, excellent wear resistance, excellent chemical stability and high neutron absorption capacity, and its applications are found in the nuclear industry, armor protection, aviation and other fields. However, high sintering temperature and low fracture toughness seriously hinder the further development of boron carbide. In order to solve these problems, the conventional method is to add a second phase material to the boron carbide matrix to reduce the sintering temperature and improve the toughness. At present, there are many studies a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 王为民张志晓杜贤武傅正义
Owner WUHAN UNIV OF TECH
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