The effect of SiC powder size at reaction bonded SiC composite fabricated by a molten Si infiltration method

Abstract

Reaction bonded silicon carbide(RBSC) composite for heat-exchanger was fabricated by molten Si infiltration method. The raw materials with variable particle sizes were used in this experience. The finer the particle size in sintered silicon carbide was the more increasing 3-point bending strength and fracture toughness. As the adaptable particle sizes had been occupied interstice arising from packing sample, the mechanical properties were increased. In the PCSl-I sample, the 3-point bending strength and fracture toughness were 323MPa and 4.9 MPa·m1/2 , respectively.