Preparation and Microstructure of Nano MoSi_2-SiC Composite by Melt Infiltration Process

MoSi_2-SiC composite was successfully prepared by Si melt infiltration into Mo+C preforms. The crystal grain size of the resultant matrix is 150-600nm,and the size of SiC phase produced is 30-160nm which disperses homogeneously in the matrix.The strength of the composite is 214.8MPa, the toughness is 4.1MPa.m~(1/2),these mechanical properties are higher than that of single phase MoSi2. TEM results show lots of stacking faults,some dislocations,and twins existing in the composite.