籽晶添加对氮化硅陶瓷显微结构与力学性能的影响

doi:10.3724/SP.J.1077.2012.11555

无机材料学报 ›› 2012, Vol. 27 ›› Issue (8): 807-812.DOI: 10.3724/SP.J.1077.2012.11555 CSTR: 32189.14.SP.J.1077.2012.11555

籽晶添加对氮化硅陶瓷显微结构与力学性能的影响

张英伟^1,2, 余建波¹, 夏咏锋², 左开慧², 姚冬旭², 曾宇平², 任忠鸣¹

(1. 上海大学材料科学与工程学院, 上海市现代冶金和材料制备重点实验室, 上海200072; 2. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海200050)

收稿日期:2011-09-01 修回日期:2011-10-30 出版日期:2012-08-20 网络出版日期:2012-07-09
作者简介:张英伟(1985-), 男, 硕士研究生. E-mail: yingweizhang2011@hotmail.com
基金资助:
国家自然科学基金(50902140、50872142); 上海市重大专项课题(08DZ1130100); 上海市现代冶金与材料制备重点实验室开放课题(SELF-2010-03)

Microstructure and Mechanical Performance of Silicon Nitride Ceramics with Seeds Addition

ZHANG Ying-Wei^1,2, YU Jian-Bo¹, XIA Yong-Feng², ZUO Kai-Hui², YAO Dong-Xu², ZENG Yu-Ping², REN Zhong-Ming¹

(1. Key Lab of Modern Metallurgy and Processing of Materials, Department of Material Science and Engineering, Shanghai University, Shanghai 200072, China; 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2011-09-01 Revised:2011-10-30 Published:2012-08-20 Online:2012-07-09
About author:ZHANG Ying-Wei. E-mail: yingweizhang2011@hotmail.com
Supported by:
National Natural Science Foundation of China (50902140, 50872142); Foundation of Shanghai Science and Technology Committee (08DZ1130100); Open Research Program of Shanghai Key Laboratory of Modern Metallurgy and Materials Processing (SELF-2010-03)

摘要/Abstract

摘要： 以不同配比的Y₂O₃-Al₂O₃为烧结助剂, 通过添加3wt%的单分散β-Si₃N₄籽晶, 采用气压烧结制备了氮化硅陶瓷, 并对所得材料的相组成、密度、室温和高温力学性能及显微结构进行了研究. 结果表明: 不同烧结助剂配比的α-Si₃N₄粉体在1800℃保温2 h即全部转化为β-Si₃N₄, 且各烧结体的相对密度都达到了97%以上. 在6wt%Y₂O₃和4.5wt%Al₂O₃为烧结助剂时, 添加3wt%籽晶的样品其室温强度和1200℃高温强度分别提高了20%和16%, 断裂韧性提高了8%.

关键词: β-Si₃N₄籽晶, 力学性能, 晶粒形貌, 液相粘度

Abstract: With Y₂O₃:Al₂O₃ of different weight ratios as sintering additives and 3wt% β-Si₃N₄ seeds addition, silicon nitride ceramics were prepared by gas pressure sintering. The phase composition, density, microstructure, room temperature as well as elevated temperature mechanical properties were investigated. The experimental results indicated that the α→β phase transformation of silicon nitride would be finished at 1800℃ for 2 h, and the densities of all specimens were over 97% of theoretical density. Compared with the specimen without seeds addition, the room temperature bending strength, the elevated temperature flexural strength at 1200℃ and the fracture toughness of the specimen with 6wt%Y₂O₃-4.5wt%Al₂O₃ and 3wt% β-Si₃N₄ seeds addition can be improved by 20%, 16% and 8%, respectively.

Key words: β-Si₃N₄seeds, mechanical property, grain morphology, viscosity of liquid phase

中图分类号:

TQ174

张英伟, 余建波, 夏咏锋, 左开慧, 姚冬旭, 曾宇平, 任忠鸣. 籽晶添加对氮化硅陶瓷显微结构与力学性能的影响[J]. 无机材料学报, 2012, 27(8): 807-812.

ZHANG Ying-Wei, YU Jian-Bo, XIA Yong-Feng, ZUO Kai-Hui, YAO Dong-Xu, ZENG Yu-Ping, REN Zhong-Ming. Microstructure and Mechanical Performance of Silicon Nitride Ceramics with Seeds Addition[J]. Journal of Inorganic Materials, 2012, 27(8): 807-812.

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籽晶添加对氮化硅陶瓷显微结构与力学性能的影响

Microstructure and Mechanical Performance of Silicon Nitride Ceramics with Seeds Addition

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