研究了N2气氛加压烧结制备的6 wt%Yb2O3和2 wt%Al2O3掺杂氮化硅复合材料在高温下的动态疲劳行为.用维氏压痕法在试样上获得规范的预制裂纹.分别在1000℃、1200℃、1300℃、1400℃下,以1、0.5、0.1、0.01 mm/min的不同压头速率对试样进行四点弯曲试验.不同温度下疲劳应力-加载速率函数曲线的对比表明,这种材料在1200℃时,对亚临界裂纹生长具有最高的抵抗力(即具有最大的亚临界裂纹生长指数N).XRD、TEM分析表面晶界相的晶化、裂纹愈合可以提高亚临界裂纹生长指数.EDS分析表明,1200℃下氮化硅陶瓷断裂面的氧化有助于晶界相的晶化,但是在更高的温度下,则会产生不利影响.
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