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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

自增韧氮化硅陶瓷显微结构与力学性能的表征

曾庆丰; 徐永东; 张立同; 成来飞; 吕杰   

  1. 西北工业大学凝固技术国家重点实验室 西安 710072
  • 收稿日期:2000-12-29 修回日期:2001-02-19 出版日期:2002-01-20 网络出版日期:2002-01-20

Characterization of Microstructure and Mechanical Properties of In-situ Toughened Si3N4

ZENG Qing-Feng; XU Yong-Dong; ZHANG Li-Tong; CHENG Lai-Fei; LU Jie   

  1. State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi an 710072; China
  • Received:2000-12-29 Revised:2001-02-19 Published:2002-01-20 Online:2002-01-20

PDF (PC)

899

被引次数

10

摘要： 运用主成分分析法对自增韧氮化硅陶瓷显微结构与力学性能的表征进行了研究．确定了该材料的显微结构可以用其表征变量的第一主成分一综合结构指标代表．为了获得结构优良的自增韧Ｓｉ３Ｎ４陶瓷，需要保证致密（基体晶粒直径ｄ１小、材料相对密度ρ'高）的基体、长径比 ＡＲ２大、直径均匀（Ｙ２ × １００小）的增韧相·通过综合结构指标的计算证实了综合结构指标相近的材料具有相近的力学性能二材料的力学性能可以用表征变量的第一、二主成分代表，分别称它们为性能稳定性指标和平均性能指标．前者代表材料受显微结构彼动影响的力学性能－断裂韧性ＫＩＣ和Ｗｅｉｂｕｌｌ模量ｍ，后者代表材料的平均力学性能一抗弯强度σｆ．

关键词: 自增韧氮化硅, 显微结构, 力学性能, 表征

Abstract: The microstructure and mechanical properties of in-situ toughened Si3N4 were studied by principal components analysis. The microstructure can be
characterized by the first principal component of its characterization variables, which intitules complex microstructure index. Compact matrix
with fine grains and uniform large grains with great aspect ration must be ensured in order to get in-situ toughened Si3N4 with excellent
microstructure. It has been approved that materials with similar complex microstructure index possessing similar mechanical properties. The mechanical
properties can be characterized by the first and the second principal components of its characterization variables, which intitule mechanical
properties stability index and average mechanical properties index. The former one reflects fracture toughness and Weibull modulus which are
affected by the fluctuation of microstructure; the later one reflects the average mechanical property, namely strength.

Key words: in-situ toughened Si3N4 microstructure, characterization, mechanical property

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