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Synthesis of dense WSi2 and WSi2-xvol.%SiC composites by high-frequency induction heated combustion and its mechanical properties

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A method to synthesize the dense silicide WSi2 and WSi2-xvol.%SiC composites within two minutes in one step from W, Si and C elemental powders was investigated. Simultaneous combustion synthesis and densification were carried out under the combined effect of an induced current and mechanical pressure. Highly dense WSi2 and WSi2-xvol.%SiC (x=10, 20, 30) with relative density of up to 97% were produced under the simultaneous application of a 60 MPa pressure and the induced current on the reactant powders. The average grain size of WSi2 in WSi2-xvol.%SiC (x=0, 10, 20, 30) were in the region of 6.9, 6.1, 5.2, and 5.0 μm, respectively. The respective Vickers hardness values for these materials were 1375, 1540, 1710, and 1845 kg/mm2. From indentation crack measurements, the fracture toughness values were calculated to be 3.3, 3.8, 4.4, and 5.1 MPa·m1/2, respectively.

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Correspondence to In Jin Shon.

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Oh, D.Y., Kim, H.C., Yoon, J.K. et al. Synthesis of dense WSi2 and WSi2-xvol.%SiC composites by high-frequency induction heated combustion and its mechanical properties. Met. Mater. Int. 12, 307–315 (2006).

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