铝添加剂对激光熔覆硬质合金涂层质量的影响

Effects of aluminium additives on the quality of hard alloy laser cladding

采用高功率激光,在高速钢表面熔覆硬质合金涂层的过程中,由于工艺参数、设备性能和熔覆粉末等原因,会引起熔覆层产生各种缺陷或不足。其中,粉末在熔池的流动性,直接影响熔覆层表面形貌;另外,在熔覆过程中氧的存在会直接导致熔覆层表面气孔产生。通过试验分析可知:在熔覆粉末中加入适量的铝添加剂会有效增加粉末在熔池中的流动性,同时,Al和O结合生成Al2O3能有效抑制气孔,并保护熔覆层表面,且不降低硬度。实验显示,当在YG12中加入质量分数为1%的Al粉时,熔覆层硬度较高,且比能量合适。

In the process of laser cladding, all kinds of defects or deficiencies on the repairing surface will be caused because of the process parameters, equipment performance, cladding powder and other reasons, in which the surface to- pography of cladding layer will be influenced by the liquidity of powder in the bath directly. In addition,the presence of oxygen will lead to the morphology of spiracle in the surface of cladding layer in the cladding process. Analysis through the experiments shows ： the liquidity of powder-pool will increase effectively by adding right amount A1 powder in the laser cladding process. Simultaneously,A1203 generated from the combination of A1 and 0 will protect the sur- face of the cladding layer and does not reduce the hardness. When the quality score of 1% of A1 powder is added in the YG12 ,cladding layer,the hardness increases,and proportion is appropriate.