High-temperature friction and wear properties of valve-seat pair with different ni contents

Abstract A detailed study is conducted on the high-temperature wear performance of valve seat rings with different Ni contents. The wear resistance of two types of contact pairs is studied through methods such as three-dimensional profile, wear amount, and wear morphology. Research has shown that the friction coefficients of both contact pairs gradually decrease with increasing temperature, while the wear amount of both contact pairs shows a trend of first decreasing and then increasing, and both have the lowest wear amount under 500? conditions. The wear performance of Inconel 751 material contact pairs is better at room temperature, but Pyromet 31 material contact pairs have stronger stability under high-temperature conditions. Therefore, Pyromet 31 material has better wear and wear resistance in high-temperature environments. Temperature can affect the hardness of materials, resulting in varying degrees of material softening, and also affect the formation rate of oxide films on wear surfaces. The rapid formation of oxide films is an important reason for the greater wear resistance of Pyromet 31 materials.