ZrB<sub>2</sub>含量和烧结温度对ZrC-ZrB<sub>2</sub>复合材料组织与性能的影响

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Abstract Using ZrC and ZrB₂ powders as raw materials, ZrC-ZrB₂ composite ceramic bulk materials with ZrB₂ content (mass fraction) of 5%, 10%, and 15% were prepared at 1 750 ℃ and 1 850 ℃ respectively by spark plasma sintering. The effects of ZrB₂ content on the microstructure and properties of the composites were studied. The results show that the surface morphology of ZrC-ZrB₂ composite is scaly, with the increase of ZrB₂ content, the grain becomes finer. When the sintering temperature is 1 750 ℃, with the increase of ZrB₂ content, the material density decreases, but the fracture toughness increases. When the content of ZrB₂ is 15%, the fracture toughness reaches 11.972 MPa·m^1/2, while when the content of ZrB₂ is 10%, the hardness is the highest of 16.868 GPa. Compared with the ZrC-ZrB₂ composites sintered at 1 750 ℃, when the sintering temperature is 1 850 ℃, recrystallization and grain growth occur, and the overall mechanical properties decrease. With the increase of ZrB₂ content, the density of the composites decreases, but the size of grain decreases and mechanical properties increases.

Key words： zirconium carbide zirconium boride spark plasma sintering microstructure Vickers hardness fracture toughness

Received: 16 December 2019 Published: 19 June 2020

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	WANG Yuanyuan
	FAN Jinglian
	LU Qiong
	HAO Ya’nan
	GAO Yin

Cite this article:

WANG Yuanyuan,FAN Jinglian,LU Qiong, et al. Effect of ZrB₂ content and sintering temperature on the microstructure and properties of ZrC-ZrB₂ composites[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 157-163.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I2/157

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