화학공학소재연구정보센터
Journal of Materials Science, Vol.33, No.6, 1653-1660, 1998
Elevated temperature mechanical properties of MoSi2/Si3N4, MoSi2/SiC composites produced by self-propagating high temperature synthesis
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.