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采用激光熔覆技术在铝合金表面制备了TiC颗粒增强Al3Ti金属间化合物复合材料涂层,研究了涂层在600℃和900℃时的高温氧化性能。结果表明,涂层由树枝晶Al3Ti,枝晶间组织α-Al和均匀分布的TiC颗粒组成。循环氧化70h后,涂层在600℃时没有明显的氧化增重,氧化产物是一层薄的Al2O3。900℃时涂层的氧化增重明显,且随着涂层中TiC含量的增加抗氧化性能降低,氧化产物是一层连续而致密的富Al2O3和MgO的混合物。氧化层在氧化过程中没有出现开裂和脱落现象,表现出较强的抗循环氧化性能。
The TiC particle reinforced Al3Ti intermetallic composite coating was prepared on the surface of aluminum alloy by laser cladding. The high temperature oxidation performance of the coating at 600 ℃ and 900 ℃ was studied. The results show that the coating consists of dendrite Al3Ti, interdendritic α-Al and uniformly distributed TiC particles. After cyclic oxidation for 70h, the coating showed no obvious weight gain at 600 ℃. The oxidation product was a thin layer of Al2O3. The oxidation weight gain of the coating was obvious at the temperature of 300 ℃, and the oxidation resistance increased with the TiC content in the coating The performance is reduced and the oxidation product is a continuous and dense mixture of Al2O3 and MgO rich. Oxide oxidation process without cracking and shedding phenomenon, showing strong resistance to cyclic oxidation.