A kind of preparation method of anti-oxidation coating of carbon/carbon composite material

Abstract

The invention relates to a preparation method for a carbon / carbon composite material oxidation resistant coating. According to the preparation method for the carbon / carbon composite material oxidationresistant coating, a coating preparation process with comprehensive properties such as good coating performance, dense coating and coating thickness no more than dozens of microns is introduced intothe field of carbon / carbon composite material oxidation resistant coatings; high melting point metal similar to the thermal expansion coefficient of a C material is selected as a transition layer, after the transition layer no more than 1 micron is prepared, a sample is placed in an atmospherically-protected high temperature environment for annealing, and thus the two materials can be fully combined; the coating for long-time protection is provided for carbon / carbon composite materials in a service environment of 700 DEG C-2000 DEG C, and the constituent materials and microstructure of the coating are required to select and design according to the requirements of the service environment.

Description

technical field [0001] The invention relates to a method for preparing a coating, in particular to a method for preparing a high-temperature oxidation-resistant coating for carbon / carbon composite materials. Background technique [0002] Carbon / carbon composites have extremely high temperature stability, especially maintain high mechanical properties in an oxygen-free environment above 2000 °C, and are the only structural materials that can maintain high strength above 2200 °C. However, when serving in an aerobic environment above 450 °C, the carbon / carbon composite material will undergo severe oxidation reaction and lead to material failure. To deal with this problem, a carbon / carbon composite material is generally prepared on the surface of the carbon / carbon composite material The layer has a protective coating with high temperature oxidation resistance. At present, coatings serving below 1000 °C generally use the sol-gel method, and coatings serving above 2000 °C use pla...

AI Technical Summary

Problems solved by technology

Only refractory metals and ceramics are the only materials that can exist stably for a long time in an aerobic environment above 1000°C. At present, the coating of these two materials is usually prepared by plasma spraying in industry. The prepared by this method The coating has the problems of rough surface, prone to cracks, and great influence on the size of the workpiece