The Study Development And Properties Of Ternary Boride Base Cermets

Along with the development of the speed up of machines and the amount of the apparatus which running under the strict circumstances of high temperature and corrosion,the properties of abrasive resistance come to be an important technical issue. Be in this situation,ternary boride based cermets appears. Ternary boride based cermets have excellent properties of mechanical,abrasive resistance,corrosive resistance and high temperature resistance. So it is widely used in industry and agriculture and plays a very important role.The institution of the properties of boride had started since the end of 80s. The institution of ternary boride based cermets is in minority countries in the world such as Japan and America. They focused in the sintering properties and knew very few about the mechanism of sintering. In-situ reaction sintering is an innovative technique to produce ternary boride based cermets.Mechanism of Mo2FeB2 based cermets and the relationship with its properties are discussed in this article.By XRD analyse,SEM and EDX analyse and studied the influence of the factors'effect of properties and microstructure of Mo2FeB2 based cermets.The factors include the ratio of Mo/B,the amount of carbon,parameters of sintering,the method of molding,the binder,the method of drying and the heat treatment etc.And obtained the best technique. The properties such as high hardness,excellent properties of abrasive resistance,corrosive resistance,physical and mechanical of ternary boride cermets are introduced briefly (also tested,analysed and discussed)here.It is demonstrated that it(Mo2FeB2 based cermets) has superior microstructure and properties while the Mo/B equals to 1.1,and the microstructure and properties improved a lot when Cr and Ni powder at 2.5 percent and CeO powder at 0.5 percent.The optimum carbon addition(0.9～1.2%wt)eliminated pores, which resulted in an improvement in transverse rupture strength. By the process Using the paraffin to take the cementing agent, ball milling it under the alcohol protection of the hygrometric state for 30 hours at the speed of 320r/Min, then vacuum drying, and taking shapes on the static pressure ,vacuum sintering at the temperature of 1280℃and using olefin as the binder we can gain the most excellent properties and microstructure of ternary boride based cermets.And Mo2FeB2 based cermets have supernal high hardness and fair properties of abrasive resistance,corrosive resistance.It also have excellent properties of metallurgy bonding with steel based.