B<sub>4</sub>C含量对ZrB<sub>2</sub>陶瓷微观结构及力学性能的影响

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Abstract Aiming at the problem that ZrB₂ ceramics powder were easily mixed with ZrO₂ during ball milling, which affected the sintering denstification of ZrB₂ ceramics, B₄C was introduced as sintering additive, and ZrB₂ ceramics were prepared by pressureless sintering. The effects of B₄C content on the microstructure and mechanical properties of the materials were investigated. The results show that B₄C can inhibit grain coarsening and reduce grain size by reacting with ZrO₂on the grain surface. With the increase of B₄C content, the grain size and relative density of the ZrB₂ ceramics increase gradually, while the flexural strength and hardness first increase and then decrease. When the mass fraction of B₄C is 7%, the grain size of ZrB₂are fine, and the flexural strength and hardness of the material reach the maximum value, which are 242 MPa and 12.65 GPa respectively. As increasing the content of B₄C to 9%, the grains grow abnormally and the mechanical properties decrease.

Key words： ZrB₂ ceramics B₄C content pressureless sintering microstructure flexural strength

Received: 26 November 2020 Published: 22 March 2021

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	DU Yuhui
	TANG Zhenxiao
	PENG Ke
	ZHOU Yuanming
	YI Maozhong

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DU Yuhui,TANG Zhenxiao,PENG Ke, et al. Effects of B₄C content on the microstructure and mechanical properties of ZrB₂ ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 77-83.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I1/77

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