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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Dy α-β Sialon 陶瓷的制备与相变研究

张骋; 孙维莹; 严东生   

  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
  • 收稿日期:1996-08-13 修回日期:1996-08-27 出版日期:1997-08-20 网络出版日期:1997-08-20

Fabrication and Study on Phase Transformation of Dy2O3-Densified α-β Sialon Ceramics

ZHANG Cheng; SUN Weiying; Yan dongsheng   

  1. The state Key Lab on High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1996-08-13 Revised:1996-08-27 Published:1997-08-20 Online:1997-08-20

PDF (PC)

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摘要： 在Dy-Si-Al－O－N系统相关系的研究基础上，设计了以DyAG和M’相作为晶界相的单相α-Sialon和β-Sialon以及复相α－β-Sialon材料．研究了它们的致密化行为，热处理过程中的α’→β’相变机制以及力学性能．结果表明：可以制备出以DyAG和M’相作为晶界相的单相α-Sialon和β-Sialon以及复相α－β-Sialon材料．作为烧结助剂，DyAG比M’更能有效地促进致密化．Dy-α’较之其他的含Dy的物相更易于形成，因此烧结样品的α’相含量比设计值高．通过热处理，使α’→β’转变发生，可以达到设计的α’/α’+β’值．

关键词: Dy, Sialon, 制备, 相变

Abstract: Based on the phase relationships in the Dy-Si-Al-O-N system, α-Sialon ceramics and α-β-Sialon composite ceramics with garnet and/or melilite as grain boundary phases were designed. The densification behavior, α’→β’ phase transformation in heat-treatment, mechanical properties and microstructure characteristic were studied. The results show that Dy-α’ and Dy-α’-β’ ceramics with garnet and/or M’ as grain boundary phases can be fabricated by HP. DyAG as an additive is more effective than M’ in promoting densification. Dy-α’ is kinetically more favourable to be formed over the other Dy-containing phases unlike the other Ln-α-Sialons, thereby the fractions of the α’ phase in the as sintered specimens is higher than the designed ones. By post sintering heat-treatment, the α’→β’ phase transformation occurs and the designed
α’/α’+β’ ratios can then be achieved.

Key words: Dy, Sialon, fabrication, phase transformation