Preparation of Mo25ZrB2 Cermet by Hot Pressing Sintering and Its Static Oxidation Behavior

Abstract

In this paper, a kind of cermet with Mo25ZrB₂ component was prepared by hot pressing sintering method, and its phase composition and mechanical properties were characterized. The characteristics show that after hot pressing sintering, Mo metal and ZrB₂ ceramic react to generate a certain amount of MoB, which makes the powder bond closely, the bending strength is close to 250 MPa, and the fracture toughness is close to the fracture toughness of the casting die H13. In addition, the static oxidation behavior of the material at different temperatures was also characterized. The experimental results show that the composite with ZrB₂ ceramic powder can overcome the problem of melting failure of Mo matrix at 800°C. The results of static oxidation at 800°C show that the oxidation of Mo matrix is not obvious. This shows that the compound of ZrB₂ effectively protects the Mo matrix and makes the Mo matrix reach a higher operating temperature. The oxidation behavior at 1000°C also showed that zirconium boride would still combine with high temperature oxygen and consume it in the first step, which played a protective role on Mo matrix. This shows that the material still has good application potential at higher temperatures.