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为了确定侧向送粉激光沉积粉末到达基板时的温度状态,并分析各工艺参数对最终温度的影响,建立了侧向送粉激光沉积中粉末颗粒与激光相互作用的数学模型。结果表明:运动模型可以确定颗粒与激光相互作用时间,温升模型可以确定颗粒温升与作用时间的关系;运动模型中,喷嘴倾角为临界角时时间最长,激光光斑半径越大时间越长;温升模型中,粉末直径越大温度升高越慢,激光功率越大温度升高越快,光斑半径越小,温度升高越快;两个模型结合即可计算特定工艺条件粉末到达基板时的状态。
In order to determine the temperature state when the side powder delivery laser deposition powder reaches the substrate and analyze the influence of the process parameters on the final temperature, a mathematical model of the interaction between the powder particles and the laser in the lateral powder delivery laser deposition is established. The results show that the kinetic model can determine the interaction time between particle and laser, and the temperature rise model can determine the relationship between the particle temperature rise and the action time. In the kinetic model, the longest nozzle angle is the critical angle and the longer the laser spot radius, In the temperature rise model, the larger the diameter of the powder, the slower the temperature increases. The larger the laser power is, the faster the temperature increases. The smaller the radius of the spot is, the faster the temperature increases. The combination of the two models can calculate the specific process conditions that the powder reaches the substrate When the state.