Mechanical Behavior And High Temperature Oxidation Behavior Of Carbide Particle-reinforced Mo Alloy

Compared to pure molybdenum, carbide reinforced molybdenum alloy has good strength and toughness at room temperature, high temperature strength and high recrystallization resistance and other characteristics. These allow it to use in some extreme conditions, and therefore it has broad application prospects in the field of aerospace, weaponry and nuclear facilities.This article prepared Mo-TiC cermet by powder metallurgy and analysis it’s microstructure and oxidation behavior at high temperature at1200℃; And using the same method sintered Mo-HfC alloy, analysis it’s densification behavior and effects of different sintering temperature and HfC content on the mechanical properties at room temperature,and characterize the microstructure of the alloy. The results are as follows:(1) The bending performance of different TiC content (40～60wt%) of Mo-TiC cermet achieve the best when sintering temperature is1800℃. Sintering temperature too low will leaving the density is low due to the sintering behavior is not completely, high sintering temperature will drop the mechanical properties due to the Mo2C brittle phase leaving.(2) The tensile strength of the Mo-HfC alloy reached the highest value at2000℃. The tensile strength of Mo-2%HfC and Mo-4%HfC alloy reached488MPa and501Mpa.After vacuum treatment, the tensile strength of Mo-HfC allohas been a certain degree of improvement. Tensile strength of Mo-0.5%HfC alloy increased from439MPa to548MPa. HfC and molybdenum mutual solid solution at high temperatures, this makes the mechanical properties of the Mo-HfC alloy to be strengthened.(3) The TiC of Mo-TiC cermet generated TiO2in the process of oxidation, oxide coatings on the sample surface can prevent oxygen to corrade the molybdenum substrate; Stable oxides formed tightly packed oxide layer on the sample surface make the sample with certain antioxidant capacity.