Simultaneous synthesis and densification of MoSi2-20vol.%Nb composite and MoSi2-20vol.%ZrO2 composite by field-activated and pressure-assisted combustion

Abstract

A method to simultaneously synthesize and consolidate MoSi2-20vol.%Nb composite and MoSi2-20vol.% ZrO2 composite from powders of Mo, Si, Nb and ZrO2 was investigated. Combustion synthesis was carded out under combined electric field and mechanical pressure. Highly dense MoSiz-20vol.%Nb and MoSi2-20vol.%ZrO2 composites up to 96% of theoretical density were produced from powders of Mo, Si, Nb and ZrO2 with 60MPa of pressure and 3000A of current on the reactant.

Combustion Synthesis: An Update

“…Shon and colleagues investigated the simultaneous synthesis and densifi cation of WSi 2 and WSi 2 -20 vol % Nb composite [36] . Compared to Ti 5 Si 3 , the formation of WSi 2 is more sluggish.…”

Oxidation features of SiOC/MoSi2 composite at low temperatures

“…Since MoSi2 has a high melting point (2030 o C), excellent oxidation resistance, moderately good strength and ductility above 1000 o C, good thermal shock resistance, and relatively low density (6.31 g/cm 3 ), it has attracted enormous interest as a next generation high temperature material [1]. However, it displays brittleness below 1000 o C, deceased high temperature strength above 1250 o C, and accelerated oxidation or a pest phenomenon.…”