激光烧结石墨烯铜复合材料温度场有限元模拟

摘要

Transient temperature field distribution is important for laser sintering graphene reinforced copper matrix com-posites.It is still difficult to measure the temperature field directly today.Numerical simulation was normally utilized to study the distribution of temperature field.Finite element models were employed to simulate the laser sintering of graphene and copper mix-ture coatings on 42CrMo base plate.The temperature distribution,the geometrical parameters of the melting pool,the width of metallurgical bonding were investigated.In order to verify simulation results,single-track experiments were performed with the same laser sintering parameters as used in simulation.It was proved that convection and radiation heat transfer,and the latent heat of phase transition play the major roles in the laser sintering process.Simulation results are consistent with experiment re-sults under the same processing parameters.Based on simulation results,the temperature field distribution and the geometrical parameters of the melting pool can be predicted.Thus,according to these guidelines,the optimal laser sintering parameters can be decided.%在激光烧结石墨烯增强铜基复合材料的过程中,了解瞬时温度场分布对优化工艺参数、控制烧结质量有重要作用.建立了激光烧结预涂在42CrMo基板上的石墨烯铜的混合粉末的有限元模型.研究了激光烧结过程温度场分布,熔池的几何参数以及烧结层与基体的冶金结合宽度.为了验证模拟结果,使用与模拟相同的参数进行了单道激光烧结的实验.研究表明,热传导、热辐射和相变潜热在激光烧结过程的温度场分布中起重要作用.实验结果与模拟结果较为一致.所以可以依据模拟结果预测实验的温度场分布和熔池几何参数,同时也可以据此优化激光烧结参数.