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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摘要在95氧化铝陶瓷粉末中添加6%(质量分数)镁铝尖晶石(MgAl₂O₄)粉末,于1 550 ℃分别烧结2 h和4 h,制备95氧化铝陶瓷材料。用扫描电镜和X射线衍射仪对陶瓷的形貌和物相组成进行观察和分析,并测试材料的硬度,研究镁铝尖晶石对95氧化铝陶瓷显微结构和力学性能的影响。结果表明,不含MgAl₂O₄颗粒的Al₂O₃陶瓷晶粒较粗大,密度较低,延长保温时间可提高陶瓷的致密度和硬度。烧结2 h和4 h得到的纯95氧化铝陶瓷,维氏硬度分别为12.6±0.4 GPa和14.7±0.4 GPa;加入6%MgAl₂O₄后,陶瓷晶粒细化,且致密度提高,烧结2 h和4 h的陶瓷硬度分别提高到13.5±0.4 GPa和15.5±0.9 GPa。

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	方豪杰
	刘秋宇
	贺亦文
	郭伟明
	张晓云
	朱林林
	曾超
	林华泰

关键词 ：镁铝尖晶石, 95氧化铝陶瓷, 显微结构, 晶粒尺寸, 力学性能

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

收稿日期: 2020-03-23 出版日期: 2020-09-18

ZTFLH:

TQ174.1

基金资助:湖南省科技攻关计划资助项目(2019GK4039)

通讯作者: 张晓云,美程陶瓷科技有限公司副总经理。电话：18873821982;E-mail: zhangxy@mctckj.cn

引用本文:

方豪杰, 刘秋宇, 贺亦文, 郭伟明, 张晓云, 朱林林, 曾超, 林华泰. 镁铝尖晶石对95氧化铝陶瓷显微结构与力学性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(4): 338-343.
FANG Haojie, LIU Qiuyu, HE Yiwen, GUO Weiming, ZHANG Xiaoyun, ZHU Linlin, ZENG Chao, LIN Huatai. Effect of magnesium aluminate spinel on the microstructures and mechanical properties of 95 alumina ceramics. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 338-343.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I4/338

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