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对激光熔覆涂层过程中,激光能量问题以及动态熔池的对流变化和温度场分布进行了分析,重点研究了反应放热激光熔覆的熔池特点。普通激光熔覆由于存在激光能量问题,不易得到较厚涂层。反应放热制备激光涂层时,材料在熔池中发生反应,放出大量热量,可以补充所需的能量,有利于熔化较厚的预涂层。并且,反应放热生成的增强相性能优良,是进行激光熔覆涂层的优选方法。在钛合金表面上,通过NiCrBSi和NiCrBSi+5wt.%B_4C两种材料体系的激光熔覆试验,验证了反应放热制备激光涂层的优越性。
In the process of laser cladding coating, laser energy, convection change and temperature field distribution of the dynamic pool are analyzed. The characteristics of the molten pool of the reactive exothermal laser cladding are emphatically studied. Ordinary laser cladding due to the existence of laser energy problems, difficult to get thicker coating. Exothermic reaction When preparing a laser coating, the material reacts in the bath and emits a large amount of heat that can be replenished with the energy required to melt the thicker pre-coating. In addition, the exothermic reaction produces enhanced phase performance and is a preferred method for laser cladding coatings. On the surface of titanium alloy, the laser cladding experiments of NiCrBSi and NiCrBSi + 5wt.% B_4C materials were carried out to verify the superiority of laser exothermic coating preparation.