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 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.
参考文献
| [1] | Sun W Y, Yan D S(Yen T S), Tian T Y(Tien T Y). Science in China (Series A), 1992, 35 (7): 877--888 2 Hirosaki N, Okada A, Matoba K. J. Am. Ceram. Soc., 1988, 71 (3): C-144--147 3 Hampshire S, Park H K, Thompson D P, Jack K H. Nature, 1978, 247: 880--882 4 Wu F Y, Zhuang H R, Ma L T, Fu X R. Ceram. Eng. Sci. Proc., 1993, 14 (1-2): 321--332 |
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