镁铝尖晶石对95氧化铝陶瓷显微结构与力学性能的影响

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Abstract The effects of 6% magnesium-aluminum spinel (MgAl₂O₄) on the microstructures and mechanical properties of 95 alumina (Al₂O₃) ceramics sintered at 1 550 ℃ with different holding times (2 h and 4 h) were studied. Scanning electron microscopy and X-ray diffraction were used to observe the ceramic and examine phase assemblage. The results showed that the grain size of Al₂O₃ ceramics without MgAl₂O₄was coarser and have lower density. Prolonging the holding time could increase the density of the ceramics, thereby increasing the hardness of the material. The Vickers hardness with sintered 2 h and 4 h were 12.6±0.4 GPa and 14.7±0.4 GPa, respectively. When 6% MgAl₂O₄ was added, the grain size of Al₂O₃ ceramics was decreased, and the relative density was also increased. The hardness were increased to 13.5±0.4 GPa (1 550 ℃/2 h) and 15.5±0.9 GPa (1 550℃/4 h).

Key words： magnesium aluminum spinel 95 alumina ceramic microstructures grain size mechanical properties

Received: 23 March 2020 Published: 18 September 2020

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	Articles by authors
	FANG Haojie
	LIU Qiuyu
	HE Yiwen
	GUO Weiming
	ZHANG Xiaoyun
	ZHU Linlin
	ZENG Chao
	LIN Huatai

Cite this article:

FANG Haojie,LIU Qiuyu,HE Yiwen, et al. Effect of magnesium aluminate spinel on the microstructures and mechanical properties of 95 alumina ceramics[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 338-343.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I4/338

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