Elevated temperature mechanical properties of MoSi2/Si3N4, MoSi2/SiC composites produced by self-propagating high temperature synthesis
Elevated temperature mechanical properties of MoSi2/Si3N4, MoSi2/SiC composites produced by self-propagating high temperature synthesis
复制标题
自蔓延高温合成MoSi2/Si3N4、MoSi2/SiC复合材料的高温力学性能
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
R. G. Castro
中科院分区：
文献类型：
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作者：
A. Bartlett;R. G. Castro
采用自扩散高温合成技术（SHS）制备了MoSi2/Si3N4和MoSi2/SiC复合粉末，并采用热压和等离子喷涂两种方法进行了固结。随后进行了在各种高温和应变速率下的四点弯曲力学测试。热压材料中的损伤积累，无论是颗粒开裂还是颗粒/基体分离，都导致复合材料的力学性能降低到低于未增强材料的水平。等离子喷涂材料表现出由Mo5Si3析出引起的幂律硬化行为，并由于基体晶粒细而降低了屈服强度而增加了应变容限。
MoSi2/Si3N4 and MoSi2/SiC composite powders were produced via a novel self-propagating high temperature synthesis technique (SHS) and consolidated both by hot-pressing and plasma spraying. Mechanical testing subsequently was performed under four-point bending at a variety of elevated temperatures and strain rates. Damage accumulation in the hot-pressed materials, either by particle cracking or particle/matrix separation, resulted in composite mechanical properties that were reduced below the level of the unreinforced material. Plasma sprayed materials showed power-law hardening behaviour caused by Mo5Si3 precipitates and increased strain tolerance because of the fine grain size and reduced yield strength of the matrix.