The protective coating of tantalum alloy in high temperature oxidation environment was prepared. Methods Slurry melting method was used in Ta - 12W alloy surface.The bottom layer and the surface layer were prepared successively, and the silicide composite coating was obtained by two melting treatments. The morphology, element content and composition of the coating were analyzed.
The high temperature oxidation resistance and heat-gain cycle life of the coating at 1800 ℃ were tested, and the failure mechanism of the coating was discussed. Results A transition layer was formed between the composite coating and the matrix by diffusion to achieve metallurgical bonding. The coating can operate continuously at 1800 interest 9H, the thermal cycle life from room temperature to 1800 is 151 times. Conclusion A glassy thin layer is formed on the surface of the composite coating in high temperature oxidation environment.
The membrane can effectively prevent the further diffusion of external oxygen to the matrix and form a good protection for the matrix. The matrix was Ta-12W alloy, the composition was shown in Table 1, and the sample size was 70mm、10 mm、1mm. The samples were "polished, pickled and washed, metallurgy pretreatment, to be used. Mix Mo,Ti,Ta,Si powder according to a certain mass ratio, Add a certain amount of organic solvents into the corundum tank. Use XMB-70.
The coating has high temperature oxidation resistance and heat resistance from room temperature to 1800. The cycle life tests are conducted in special coating high temperature performance testing equipment.
