Investigation of Al2O3/Cr3C2 composites prepared by pressureless sintering : 3

Abstract The phase stability of Cr 3 C 2 in Al 2 O 3 /Cr 3 C 2 composites sintered in as received Ar, purified Ar and vacuum were investigated. Test samples were cold isostatically pressed prior to pressureless sintering. Results suggested that phase conversion of Cr 3 C 2 was eliminated by the reduction of oxygen content in sintering atmosphere. In addition, the porosities were substantially reduced, and strength and toughness were enhanced while sintered in vacuum. ©