Comparison of the properties of TiC/Fe-Al composites produced by self-propagating high-temperature synthesis and hot isostatic pressing

摘要

Self-propagating high-temperature synthesis (SHS)and hot isostatic pressing (HIP) techniques were used to produceTiC-20 wt. percent Fe-Al and TiC-40 wt. percent Fe-Al compositematerials. The microstructure of the materials produced by theSHS technique consisted of spherical carbide particles embeddedin an iron aluminide matrix whereas the microstructure of thematerials produced by the HIP technique was less regular. Amaximum hardness of 1820 HV_1 was measured for the materialproduced suing HIP and a maximum fracture toughness of 16.3MPa m~(1/2) was obtained for the materials produced by SHS.Hardness values obtained from samples produced by the HIPtechnique were higher than those obtained from samples producedby the SHS technique. The SHS samples had better fracturetoughness. The results of the oxidation resistance tests showed thatTiC/Fe-Al composite materials can be recommended for use inoxidative environments holding temperatures up to 800 deg C.