Abstract
A unique process to prepare composite coating on titanium alloy by electron beam cladding is explored for improving durable oxidation resistance. The composite coating can be divided into two layers, including in-situ fabricated transition layer and pure Al layer. The isothermal oxidation tests are carried out at 973 and 1073 K. The composite coating reduced the oxidation rate to approximately 1/10 and 1/4 that of the substrate due to formation of Al2O3. It can be obtained by the oxidation rate that the diffusion coefficient of composite coating is 4 ×10−20m2/s, which is lower than 1 ×10−18m2/s of the substrate. It indicated that the composite coating improves the oxidation resistance by inhibiting the diffusion of O. Although the oxidation rate of pure Al coating is similar to that of composite coating, the largest bonding force and completed structure after 20 cycles thermal shock of composite coating reveals that composite coating can improve the durability of oxidation resistance due to providing match CTE, which will improve the oxidation resistance further.
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