TiAl-based alloy high-temperature oxidation resistant coating and method for implementing same

Abstract

The invention discloses a TiAl-based alloy high-temperature oxidation resistant coating, which comprises the following components: SiO2, Na2O and CaO. The method for implementing the TiAl-based alloy high-temperature oxidation resistant coating comprises the following steps of: firstly, taking the components of the TiAl-based alloy high-temperature oxidation resistant coating according to a proportion; heating the components to about 1,500 DEG C, keeping the temperature, and allowing the components to cool to obtain a raw material of the oxidation resistant coating; heating the raw material of the oxidation resistant coating till the raw material of the oxidation resistant coating is in a viscous state; and coating the raw material in the viscous state on the surface of TiAl-based alloy or completely immersing the TiAl-based alloy in the raw material in the viscous state to apply oxidation resistant protection to the TiAl-based alloy during processing at a high temperatue of 1,300 DEG C. The coating is reasonable in component mixing ratio, simple in production process, convenient in operation and use and low in cost, effectively prevents the oxidization of TiAl-based alloy, avoids influencing the high-temperature deformation capacity of the TiAl-based alloy, separates conveniently from a substrate at normal temperature, effectively overcomes the drawbacks of uneven deformation of easy cracking of the TiAl-based alloy, and difficult separation of a covering sleeve and the alloy in the prior art, is applicable to industrial application, and can replace the prior TiAl-based alloy high-temperature oxidation resistant process.

Description

technical field [0001] The invention discloses a TiAl-based alloy high-temperature anti-oxidation coating and a method thereof. Background technique [0002] TiAl-based alloy has high specific strength, specific stiffness and low density, as well as good high-temperature oxidation resistance and creep resistance. It is a very potential light-weight high-temperature structural material. However, the oxidation resistance of alloys above 850 °C decreases significantly, while the thermal processing and heat treatment of TiAl-based alloys are between 900 and 1300 °C. Therefore, preventing the oxidation behavior of TiAl-based alloys during high-temperature treatment is important. The development and application of alloys are of great significance. At present, many scholars at home and abroad have studied the anti-oxidation method of TiAl-based alloys during high-temperature deformation and heat treatment, mainly through the use of special sheaths. High, and during the processing...

AI Technical Summary

Problems solved by technology

[0002] TiAl-based alloy has high specific strength, specific stiffness and low density, as well as good high-temperature oxidation resistance and creep resistance. It is a very potential light-weight high-temperature structural material. However, the oxidation resistance of alloys above 850 °C decreases significantly, while the thermal processing and heat treatment of TiAl-based alloys are between 900 and 1300 °C. Therefore, preventing the oxidation behavior of TiAl-based alloys during high-temperature treatment is important. The development and application of alloys are of great significance

At present, many scholars at home and abroad have studied the anti-oxidation method of TiAl-based alloys during high-temperature deformation and heat treatment, mainly through the use of special sheaths. High, and in the process of processing, due to the inconsistency between the deformation of the sheath and the deformation of the TiAl-based alloy, the deformation of the TiAl-based alloy is uneven and prone to crack defects. At the same time, it is difficult to separate the sheath from the alloy after deformation