无机材料学报

• 研究论文 • 上一篇    下一篇

α/β-Sialon陶瓷材料及其疲劳寿命研究

邬凤英; 来亭荣; 庄汉锐; 王佩玲   

  1. 中国科学院上海硅酸盐研究所; 上海 200050
  • 收稿日期:1997-10-16 修回日期:1997-12-23 出版日期:1998-10-20 网络出版日期:1998-10-20

α/β-Sialon Ceramic and its Fatigue Life

WU Feng-Ying; LAI Ting-Rong; ZHUANG Han-Rui; WANG Pei-Ling   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1997-10-16 Revised:1997-12-23 Published:1998-10-20 Online:1998-10-20

摘要: 通过组成设计,以Si3N4、AIN、Al2O3和Y2O3粉末为原料,采用气氛加压烧结工艺,在1800~1980℃,1.0~3、0MPaN2压力下烧结,制备了α/β-Sialon陶瓷材料,通过XRD,SEM和HREM等分析可见,其材料的显微结构是由棒状的β-Sialon和近似等轴的α-Sialona组成,在晶界存在微量的结晶相和玻璃相.并进一步研究了α/β-Sialon陶瓷材料的疲劳寿命,实验证明,该材料的疲劳极限约为其静态强度的75%.

关键词: α/β-Sialon, 疲劳寿命, 显微结构

Abstract: The investigations were mainly focused on the phase composition, microstructure and fatigue life of α/β-Sialon
ceramics prepared from powder mixtures of Si3N4, AlN, Al2O3 and Y2O3 by gas pressure sintering. The results obtained show
that the Sialon ceramics material is mainly composed of 70% β-Sialon, 30% α-Sialon with a small amount crystalline
phase and glassy phase on grain boundaries. The cyclic fatigue life testings were conducted by using a commercial servohydraulic machine
operated under load control, with a sinusoidal wave form at a frequency of 25 Hz and load ratios (R) of 0.1. The operations lead
to result that fatigue limit stress is about 75% static strength for this material.

Key words: α/β-Sialon, fatigue life, microstructure

中图分类号: