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采用一维半无限模型和双层板理想接触模型对等离子喷涂Al2 O3陶瓷涂层激光重熔的熔化层厚度进行了计算 ,并与实验结果进行了比较。激光加热速度和熔区自冷却速度达 10 5℃ /s以上 ,温度梯度达 10 5℃ /mm以上 ;双层板理想接触模型的计算结果比一维半无限模型的结果更接近实验值。涂层设计对熔化层厚度有显著影响 ,喷有单一陶瓷层的熔化厚度最大 ,粘结层和过渡层引入之后 ,熔化层厚度下降 ,且还随SiO2 的含量增加而进一步下降。在具有相同涂层设计时 ,熔化层厚度随激光能量密度的增大而增大。
The melt thickness of laser remelted plasma sprayed Al 2 O 3 ceramic coating was calculated by one-dimensional semi-infinite model and ideal contact model of double-layer plate, and compared with the experimental results. The laser heating rate and self-cooling rate of the melt zone were above 105 ℃ / s and the temperature gradient was over 105 ℃ / mm. The calculated results of the ideal contact model of the double-layer plate were closer to the experimental values than the one-dimensional semi-infinite model. The design of the coating has a significant effect on the thickness of the melted layer. The melting thickness of the sprayed single ceramic layer is the largest. After the bonding layer and the transition layer are introduced, the thickness of the melted layer decreases and further decreases with the increase of SiO2 content. With the same coating design, the thickness of the melted layer increases as the laser energy density increases.