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研制了一种以磷酸盐涂层和陶瓷涂层相结合的新型复合防氧化涂层,并针对不同的烧结温度对这种复合涂层的防氧化性能进行了研究。结果表明:在700℃静态氧化30 h后,800℃烧结的复合涂层试样的氧化失重率最小,为0.99%;经过900℃,3 min圳室温,2 min 30次和1 100℃,3 min圳室温,2 min 10次连续热震后,其氧化失重率仅为0.31%,氧化速率为1.34×10-7g·cm-2·s-1。SEM观察结果显示不同烧结温度制备的涂层表面微观形貌明显不同,800℃烧结的涂层表面完整致密,氧化后涂层仍然保持完好,没有脱落,说明该涂层与炭基体的结合性能以及热稳定性能良好,适合作为飞机炭刹车副的防氧化涂料。
A novel composite anti-oxidation coating was developed by combining phosphate coating and ceramic coating. The anti-oxidation performance of the composite coating was studied at different sintering temperatures. The results show that the oxidation loss rate of the composite coating sample sintered at 800 ℃ is the smallest at 0.99% after being oxidized at 700 ℃ for 30 h. After 3 min at room temperature, 30 min at 2 min and 1 100 ℃, 3 min at room temperature, 10 min after two consecutive thermal shocks, the rate of oxidative weight loss was only 0.31% and the oxidation rate was 1.34 × 10-7g · cm-2 · s-1. The SEM observation shows that the microstructures of the coatings prepared by different sintering temperatures are obviously different. The surface of the coatings sintered at 800 ℃ is complete and compact. The coatings remain intact and do not fall off after oxidation, indicating the bonding properties between the coating and the carbon matrix and Thermal stability is good, suitable as an anti-oxidation coating of the aircraft carbon brake.