Abstract
Molybdenum disilicide (MoSi2) is considered to be a promising high temperature material for turbojet and hypersonic engines in aerospace and various industrial applications, because of a high melting point(2030 ), adequate density(6.3g/cm 3 ) and an excellent oxidation resistance. Some researches on MoSi2 have been carried out but the wear behavior of this material is seldom studied. This paper studies the effect of sintering temperature of MoSi2 on the wear behavior. MoSi2 powder was evaluated from the variation of fabricating such as preparation temperature 1250 , 1350 and 1500 respectively. Wear tests were performed with an sliding speed of 7.5RPM and a normal load of 8kgf. Each test was run over a period of 6hours. The wear behavior is evaluated with respect to the hardness of materials. Hardness test was made with a load of 1kg with Micro-vickers hardness tester. Every hardness value was an average of ten points. As a result of the tests, the friction coefficient was decreased with sintered MoSi2 of increasing temperature but the friction coefficient did not vary much for all specimens at temperatures. Hardness values decreases with the decrease in sintering temperature because the indentation under a lower temperature probably contained more defects(pores).