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Method for promoting sintering of titanium boride ceramic by using reaction aids

A reaction aid, titanium boride technology, applied in the field of structural ceramics, can solve the problems of unfavorable and impacted ceramic high-temperature mechanical properties and corrosion resistance, and achieve small particle size, adjustable material components, and uniform microstructure. Effect

Active Publication Date: 2011-11-23
中科西卡思(苏州)科技发展有限公司
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  • Application Information

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Problems solved by technology

Previous studies generally improved its sintering performance by adding sintering aids by generating a liquid phase, such as adding metal sintering aids Ni, Fe, Cr or non-metallic sintering aids AlN, S 3 N 4 、MoSi 2 etc. However, the residual low-melting point phase at the grain boundary or trifurcation grain boundary of ceramics will have an adverse effect on the high-temperature mechanical properties and corrosion resistance of ceramics

Method used

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  • Method for promoting sintering of titanium boride ceramic by using reaction aids
  • Method for promoting sintering of titanium boride ceramic by using reaction aids
  • Method for promoting sintering of titanium boride ceramic by using reaction aids

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Titanium boride (figure 1 shown.

Embodiment 2

[0032] According to the method in Example 1, titanium boride powder containing reactive sintering aids was obtained. Put the uniformly mixed powder in a graphite mold coated with BN on the inner wall surface, and carry out reaction sintering in vacuum. The heating rate during sintering is 10°C / min. Pressure, under an argon atmosphere, the temperature was raised to 2000°C at a rate of 10°C / min, and the pressure was maintained for 1h. The material density reaches 98%. Microstructure such as figure 2 shown.

Embodiment 3

[0034] Using titanium boride (4 The amount of C added was 10 wt%. Add 2.17g of titanium powder and 0.83g of boron carbide powder into a plastic tank, add ethanol and ultrasonically disperse for 15 minutes, mix with silicon nitride balls on a roller mixer for 12 hours, add 27g of titanium boride, and mix for 12 hours , and then dried with a rotary evaporator and passed through a 200-mesh sieve to obtain titanium boride powder containing reactive sintering aids. Ceramics were prepared according to the method of Example 1, the sintering temperature was 1800° C., and the heat preservation and pressure holding were carried out for 1 hour. The material density reaches 74%.

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Abstract

The invention relates to a method for promoting the sintering of titanium boride ceramic by using reaction aids, belonging to the field of structural ceramic. The method comprises the following steps of: adding compound aids Ti and B / B4C / C serving as sintering aids which can react at low temperature; promoting the sintering of TiB2 ceramic by using two-phase particles with high sintering activitygenerated by an in-situ reaction between the sintering adds; and preparing TiB2 ceramic of which the relative density is more than 97 percent by performing hot rolling at the temperature between 1,800 DEG C and 2,000 DEG C. A second phase (titanium boride or titanium carbide) generated by using the method has a melting point as high as that of a substrate, and untoward influence on the high temperature mechanical property of a material caused by the sintering aids is eliminated.

Description

technical field [0001] The invention relates to a method for promoting the sintering of titanium boride ceramics by a reaction aid, belonging to the field of structural ceramics. Background technique [0002] TiB 2 Ceramics have excellent physical and chemical properties such as high melting point, high chemical stability, corrosion resistance, oxidation resistance, high hardness, excellent wear resistance, good electrical conductivity and thermal conductivity, so they are regarded as the most promising materials for wide application. Boride ceramics have attracted much attention. [0003] Although TiB 2 There are a series of excellent properties, but so far, TiB 2 The application of ceramics is still greatly restricted, the reason is that it is difficult to obtain dense TiB 2 Sintered body. TiB 2 Ceramics generally require high temperature (>2000°C) and high pressure (>30MPa) to obtain a dense sintered body, and such a high sintering temperature will promote exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63C04B35/58
Inventor 张国军王丽阚艳梅王佩玲
Owner 中科西卡思(苏州)科技发展有限公司
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