SPS工艺参数对ZrB<sub>2</sub>-MoSi<sub>2</sub>-SiC复合陶瓷组织与高温抗氧化性能的影响

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Abstract ZrB₂-MoSi₂-SiC composite ceramics (ZMS15 ceramics) were prepared by spark plasma sintering (SPS) at the sintering temperature of 1 700-2 000 ℃, heating rate of 75-150 ℃/min and holding time of 3-10 min. The effects of sintering temperature, heating rate and holding time on the relative density and the oxidation resistance at 1 200 ℃ of the composite ceramics were studied. The results show that the relative density of ZrB₂-MoSi₂-SiC composite ceramics increases with the increase of sintering temperature and heating rate, and the relative density reaches the maximum value when the holding time is 7 min. ZMS15 ceramic forms a double-layer structure during oxidation. The outer layer is glassy SiO₂ layer, and the inner layer is granular ZrO₂ layer. With increasing sintering temperature, the high temperture oxidation resistance of the material increases. The optimal SPS process for ZrB₂-MoSi₂-SiC composite ceramics is sintering temperature of 2 000 ℃, heating rate of 125 ℃/min, and holding time of 7 min. The relative density of the ceramics is greater than 98.5%, and the mass change is less than 8 mg/cm²after oxidation at 1 200 ℃ for 72 h.

Key words： spark plasma sintering ZrB₂-MoSi₂-SiC ceramic process parameters relative density oxidation resistance

Received: 04 September 2020 Published: 18 January 2021

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	ZHANG Yudong
	LI Jiwen
	WANG Nannan
	PAN Kunming
	ZHANG Liangliang

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ZHANG Yudong,LI Jiwen,WANG Nannan, et al. Effects of SPS process parameters on microstructure and high-temperature oxidation resistance of ZrB₂-MoSi₂-SiC composite ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 505-512.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I6/505

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