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无机材料学报

无机材料学报

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复合稀土-α-β-Sialon的力学性能和热稳定性特性

孙维莹; 张骋   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷; 超微结构国家重点实验室 上海 200050
  • 收稿日期:1998-08-21 修回日期:1998-09-11 出版日期:1999-08-20 网络出版日期:1999-08-20

Characteristics of Duplex Ln α β Sialon in Mechanical Properties and Thermal Stability

SUN Wei-Ying, ZHANG Cheng   

  1. State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics Shanghai 200050 China
  • Received:1998-08-21 Revised:1998-09-11 Published:1999-08-20 Online:1999-08-20

PDF (PC)

841

被引次数

31

摘要： 采用 Ｄｙ、 Ｓｍ 和（ Ｄｙ＋ Ｓｍ） 作为α-Ｓｉａｌｏｎ 的生成剂， 比较了这三类α-β-Ｓｉａｌｏｎ 陶瓷的相组成的控制、力学性能和显微结构结果表明： 含复合稀土（ Ｄｙ ＋ Ｓｍ） 的α-β-Ｓｉａｌｏｎ 陶瓷比使用单一稀土的 Ｓｉａｌｏｎ 陶瓷具有更大的优越性与 Ｓｍ-Ｓｉａｌｏｎ 不一样， 在（ Ｄｙ ＋ Ｓｍ）- Ｓｉａｌｏｎ 组份中， 在形成α-Ｓｉａｌｏｎ 时黄长石并不形成， 因此能获得依据相平衡计算所得的α′含量. Ｓｍ-Ｓｉａｌｏｎ 具有精细的显微结构， 较高的抗弯强度和断裂韧性， 这些特性能保留在（ Ｄｙ ＋ Ｓｍ）-Ｓｉａｌｏｎ 中. Ｄｙ- Ｓｉａｌｏｎ 具有较高的硬度，其α-Ｓｉａｌｏｎ 相在热处理时十分稳定， 这些特征也能保留于（ Ｄｙ＋ Ｓｍ）- Ｓｉａｌｏｎ 中因此， （ Ｄｙ ＋ Ｓｍ）-α-β-Ｓｉａｌｏｎ 的热稳定性好， 并具有良好的力学性能.

关键词: Dy, Sm, Sialon, 热稳定性, 力学性能

Abstract: The phase control, mechanical properties and microstructures of α-β-Sialon ceramics were compared among the three counterpart Dy-, Sm-
and (Dy+Sm)-α-β-Sialon compositions. The results show that the dulpex Ln-α-β-Sialon possesses advantage over the single
Ln-α-β-Sialon. Unlike Sm-Sialon, in the (Dy+Sm)-Sialon compositions melilite phase does not occurs during the formation of
α-Sialon. Therefore, the phase compositions based on phase equilibrium can be easily controlled. Sm-Sialons have a rather finer microstructure, higher flexural strength and fracture toughness. These characteristics can
remain in (Dy+Sm)-Sialon ceramics. Dy-Sialons possess a higher hardness and Dy-α’ is much stable than Sm-β’ during heat treatment, which can also
remain in (Dy+Sm)-Sialon ceramics. Therefore, (Dy+Sm)-α-β-Sialon ceramics are quite stable during heat treatment and possesses good mechanical properties.

Key words: Dy, Sm, Sialon, thermal stability, mechanical property

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