Abstract
ABSTRACTTwo molybdenum-modified chromium suicide base intermetallics have been prepared by powder metallurgy and investigated with respect to the hardness, flexural strength and fracture toughness at different temperatures. As toughening phase, tungsten, Pt-6%Rh and Saphikon fibres were tried to improve the toughness of these two intermetallics. The tungsten fibers generated microcracks in the base material due to the large mismatch in the coefficients of thermal expansion (CTE) between the fiber and the intermetallic. The Pt-6%Rh and Saphikon fibers did not exhibit such cracking.An improvement in the fracture toughness was observed especially at elevated temperatures. The Saphikon fibers did not show interfacial reaction. Some limited diffusion of silicon was detected in the Pt-6%Rh phase after 1400°C treatment.
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