利用ANSYS软件建立Ti6Al4V基板上同轴送粉激光熔覆Al2O3陶瓷单道涂层的温度场有限元模型,通过熔池形貌比对及热电偶测温实验验证模型的可靠性.利用建立的模型,进一步分析陶瓷涂层冷却阶段温度梯度的变化规律及基板预热对温度梯度的影响.结果表明,陶瓷涂层冷却阶段温度梯度逐渐减小;当温度降到Al2O3陶瓷塑性点时,最大温度梯度位于涂层与基体结合界面的边缘,导致此处极易产生裂纹.基板预热可以显著降低陶瓷涂层冷却阶段温度梯度,且预热温度越高,温度梯度降低越明显,因此可以有效地抑制裂纹产生.
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