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晶种加入对α-SiAlON显微结构与性能的影响

黄清伟1; 王凤玲1; 程一兵2; 严东生1   

  1. 1. 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; 2. 澳大利亚Monash大学材料工程系; 维多利亚 3168
  • 收稿日期:2001-02-23 修回日期:2001-06-17 出版日期:2002-03-20 网络出版日期:2002-03-20

Effects of Seeding on Microstructure and Fracture Toughness of α-S1AION

HUANG Qing-Wei1; WANG Pei-Ling1; CHENG Yi-Bing2; YAN Dong-Sheng1   

  1. 1.; State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China; 2. Department of Materials Engineering Monash University, Victoria, 3168 Australia
  • Received:2001-02-23 Revised:2001-06-17 Published:2002-03-20 Online:2002-03-20

摘要: 采用无压烧结和酸洗的方法制备了α-SiAlON单晶颗粒,并将这些单晶颗粒作为晶种加入到YSm-α-SiAlON原始组份中,研究了陶瓷显微结构与性能的变化.结果表明:未加入晶种的YSm-α-SiAlON陶瓷主要由细小晶粒和少量粗大晶粒组成,而晶种加入后,陶瓷中出现了柱状晶粒;柱状晶粒的尺寸与数量可由晶种的数量和尺寸控制.晶种加入导致YSm-α-SiAlON陶瓷韧性升高,韧性升高的原因与柱状晶粒的拔出与桥接有关.

关键词: 晶种, α-SiAlON显微结构, 断裂韧性, 氮化物陶瓷

Abstract: α-SiAlON single crystal particles were obtained by a method of pressureless sintering and subsequent
acid treatments. The microstructure of YSm-α-SiAlON ceramics containing α-SiAlON single crystal particles was investigated. The experimental
results showed that the specimen without seeding consisted of fine elongated grains and small amount of relatively coarse grains. When specimens were
seeded with α-SiAlON single crystal particles, the elongated α-SiAlON grains presented. The morphology and amount of elongated
grains were effected by the seed size & amount. The fracture toughness of α-SiAlON ceramics with seeding was improved, owing to
grain pullout and bridging of elongated grains.

Key words: seed, α-SiAlON, microstructure, fracture toughness, nitride ceramics

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