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为了研究激光高能量密度下纳米颗粒的生长情况,从而为优化工艺参数提供参考,在Brook晶粒生长经典理论基础上,结合有限元软件Ansys数值模拟的激光熔覆温度场,计算了激光熔覆等离子体喷涂预置纳米Al2O3+13%TiO2(质量分数)陶瓷涂层过程中纳米颗粒尺寸变化,并讨论了纳米颗粒初始尺寸及不同熔覆区域对其生长的影响。同时,对等离子体喷涂纳米涂层进行了激光熔覆试验。结果表明,纳米颗粒在激光熔覆试验中生长情况的总体趋势与理论计算结果基本一致,说明基于Brook理论的晶粒生长理论对了解纳米颗粒在激光熔覆过程中的生长有一定的理论指导意义。
In order to study the growth of nanoparticles under laser high energy density and to provide a reference for the optimization of process parameters, based on the classic theory of Brook growth, the laser cladding temperature field was simulated with Ansys numerical simulation software. The changes of the size of nano-particles during plasma spraying pre-coating of nano-Al2O3 + 13% TiO2 (mass fraction) ceramic coating were discussed. The effects of the initial size of nano-particles and different cladding regions on their growth were discussed. At the same time, laser cladding test was carried out on plasma sprayed nano-coating. The results show that the general trend of the growth of the nanoparticles in the laser cladding experiment is basically consistent with the theoretical calculation results, which shows that the theory of grain growth based on Brook theory has certain theoretical significance for understanding the growth of the nanoparticles during laser cladding .