The invention relates to an anti-oxidation material and a method for preparing an anti-oxidation coating of tantalum tungsten alloy. It is characterized by the first antioxidant material and the second antioxidant material composition; The composition of the first antioxidant material is as follows: Cr 1 ~ 5Wt %, Ti 1 ~ 5Wt %, Y2O3 0.1 ~ 2Wt %, W 0.5 ~ 3Wt %, Nb 0.5 ~ 3Wt %, HfO2 1 ~ 5Wt %; Allowance is Si; The composition of the second antioxidant material is as follows: Mo is 6-15wt %, W is 0.5-3wt %, Nb is 0.5-3wt %, Y is 0.3-2.2wt %, HfO2 is 1-5wt %; The margin is Si. The high temperature oxidation resistance coating of tantalum tungsten alloy prepared according to the method of the invention has a wide operating temperature range and strong continuous static load oxidation resistance, and is especially suitable for high temperature structural parts such as thrust chamber, nozzle, leading edge and pipe of space engine.
Tantalum-tungsten alloy is an important member of tantalum base alloy family, with melting point up to 3000°C and excellent mechanical properties at high temperature, as well as good welding performance and high temperature creep resistance, it has the necessary conditions to become a new generation of high temperature construction materials for aerospace and aerospace engines. However, like C103, TZM and other refractory metal alloy materials, tantalum tungsten alloy will fail due to pest oxidation at temperature above 500°C, so it must be protected against oxidation.
Alloy protection and coating protection are two common anti-oxidation protection methods for refractory metal materials. The oxidation resistance temperature of the alloy can be increased to 10 ~1200°C by alloying, but the high temperature mechanical strength and machining property of the alloy can be significantly reduced. Coating protection can significantly improve the oxidation resistance temperature of the alloy, and has little influence on the mechanical properties of the alloy (< 15Wt%), and can be coated after processing, there is no influence on the processing properties of the alloy, so it is the most widely used means of oxidation protection in the world.
