Abstract

Dense WSi_2-20vol.%SiC composite was synthesized by high-frequency induction-heated combustion synthesis(HFIHCS) method within 2 minutes in one step from elemental powder mixture of W, Si and C. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense WSi_2-20vol.%SiC with relative density of up to 97% was produced under simultaneous application of 60MPa pressure and the induced current. The average grain size of WSi_2 was about 5.2µm. The hardness and fracture toughness values obtained were 1700kg/mm2 and 4.4MPacdotm1/2, respectively.

• Keywords: High-frequency induction heated combustion;Tungsten Silicides;Combustion Synthesis;Hardness;Fracture Toughness;