Method of preparing high-temperature oxidation-resistant coating on surface of refractory metal material

Abstract

The invention discloses a method of preparing a high-temperature oxidation-resistant coating on the surface of a refractory metal material. The method is characterized in that by adopting a plasma arc spray welding technology, a Mo-Si-B alloy high-temperature oxidation-resistant coating is prepared on the surface of refractory metal. With the adoption of Mo-Si-B alloy powder containing required components, and by controlling a dilution rate, coating components can be controlled, and a foundation is established for the flexible design of the coating components; compared with the traditional pack cementation method, thermal spraying method and magnetron sputtering method, with the adoption of the plasma arc spray welding technology, the coating bonding strength, the coating thickness and the coating compactness are improved obviously, and a guarantee is provided for the Mo-Si-B alloy high-temperature oxidation-resistant coating which is long in service life. According to the Mo-Si-B alloy high-temperature oxidation-resistant coating, the oxidation resistance at high temperature of refractory metal like molybdenum, niobium, tantalum and alloys of molybdenum, niobium and tantalum is improved effectively, and the service lives of refractory metal spare parts are prolonged obviously.

Description

technical field

[0001] The invention belongs to the technical field of coating preparation, and relates to a method for preparing a high-temperature anti-oxidation coating on the surface of a refractory metal material. Background technique

[0002] Refractory metals molybdenum, niobium, tantalum and their alloys are widely used in high-temperature parts in the fields of aviation, aerospace, energy and transportation due to their high melting point, good high-temperature mechanical properties, creep strength, and wear resistance. superior. As a structural material used in a high-temperature environment, not only is the material required to have high high-temperature strength and fracture toughness, but it can also meet the requirements for oxidation resistance in a high-temperature environment. However, refractory metals molybdenum, niobium, tantalum and their alloys begin to undergo serious oxidation above 600°C in an oxidizing atmosphere, and as the temperature increases, ...