气压烧结Re-α/β-Sialon陶瓷材料

邬风英; 庄汉锐; 王佩玲

气压烧结Re-α/β-Sialon陶瓷材料

中国科学院上海硅酸盐研究所, 上海 200050

基金项目:

国家自然科学基金,编号19392300。

详细信息

作者简介:
邬风英：邬凤英,高级工程师,硕士研究生导师,主要从事高温结构陶瓷研究,获两顶专利成果并发表论文40余篇。

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出版历程
- 收稿日期: 1996-11-25

Re-α/β-Sialon Ceramics by Gas Pressure Sintering

Shanghai Institute of Ceranncs, Chinese Academy of Sciences, Shanghai 200050

摘要

摘要: 选用Si₃N₄、AlN、Al₂O₃和Sm₂O₃(或Nd₂O₃)粉末为原料,在1800~1950℃的温度范围内,1.0~3.0MPa氮气压力下烧结(GPS),制备了性能优良的Re-α/β-Sialon(Re=Nd,Sm)陶瓷材料;利用XRD、EDS、TEM和EREM手段研究了材料的相组成、显微结构特性及其与性能的关系。结果表明,其主晶相为长柱状的β-Sialon和近似等轴的Re-α-Sialon,晶界由少量的结晶相以及微量的玻璃相构成:长柱状的β-Sialon有利于提高材料的抗弯强度和断裂韧性。实验发现,以Sm₂O₃作为稳定剂比Nd₂O₃更容易形成α-Sialon。
- Re-α-Sialon /
- β-Sialon /
- 气压烧结 /
- 显微组织 /
- 性能
Abstract: The investigation were mainly focused on the phase composition, microstructure and mechanical properties of fully-dense Re-α/β-Sialon (Re=Sm, Nd) ceramics prepared from Powder mixtures of Si₃N₄, AlN, Al₂O₃ and Sm₂O₃ (or Nd₂O₃) by gas pressure sintering (GPS).Its microstructure was observed by SEM,TEM and HREM. The results show that whisker-like β-Sialon grains and equal-axed α-Sialon grains intersected each other as main crystalline phase, with a small amount of glassy phase and crystalline phase on grain boundaries. These elongated β-Sialon grains offer the major contribution to the unique mechanical properties of the present material. It also has been found that the Sm-α-Sialon is more liable to be formed with the stabilizing agent Sm₂O₃.
- Re-α-Sialon /
- β-Sialon /
- GPS /