用爆炸喷涂法制备了 Al2 O3与自熔性合金的陶瓷梯度涂层。结果表明 ,基体 /Ni60 /2 5% Al2 O3+ 75% Ni60 /50 %Al2 O3+ 50 % Ni60 /Al2 O3的陶瓷梯度涂层具有较好的结合力 ,较低的残余内应力及和缓的热应力。对粉末及涂层的XRD谱分析表明 ,爆炸喷涂的 Al2 O3陶瓷涂层结构为γ- Al2 O3,而其粉末结构为α- Al2 O3,这说明在爆炸喷涂中存在相变过程。爆炸喷涂 Al2 O3陶瓷梯度涂层适合于工作环境较恶劣的热障耐磨涂层。 A ceramic gradient coating of Al 2 O 3 and self-fluxing alloy was prepared by explosive spraying method. The results show that the ceramic / Ni60 / 2 5% Al 2 O 3 + 75% Ni 60/50% Al 2 O 3 + 50% Ni 60 / Al 2 O 3 ceramic gradient coating has better adhesion, lower residual internal stress and gentle thermal stress. XRD spectra of the powder and the coating showed that the structure of the Al2 O3 ceramic coating detonated by spraying was γ-Al2 O3, and its powder structure was α-Al2 O3, indicating that there was a phase transition in the explosive spraying. Blast spraying Al2 O3 ceramic gradient coating is suitable for the harsh environment of the thermal barrier wear-resistant coating.