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％．
The investigations were mainly focused on the phase composition, microstructure and fatiguelife of α/β-Sialon ceramics prepared from powder mixtures of Si33N4 , AIN, Al2O3 and Y2O3 by gaspressure sintering. The results obtained show that the Sialon ceramics material is mainly composedof 70 % β-Sialon, 30% α-Sialon with a small amount crystalline phase and glassy phase on grainboundaries. The cyclic fatigue life testings were conducted by using a commercial servohydraulicmachine operated under load control, with a sinusoidal wave form at a frequency of 25 Hi andload ratios (R) of 0.1. The operations lead to result that fatigue limit stress is about 75% staticstrength for this material.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第5期759-762,共4页
Journal of Inorganic Materials
基金
国家自然科学基金!19392300
