搭接率与二次重熔对激光熔覆石墨/铜自润滑复合材料组织的影响

Effect of Lap Ratio and Secondary Cladding on Laser Cladding Graphite/Copper Self-lubricating Composite

为了改善石墨/铜自润滑材料激光熔覆层的平整度,探索了激光搭接率对熔覆层平整度的影响与二次重熔处理对熔覆层表面的改善效果。结果表明,激光搭接率为75%不适合作为实际加工时的工艺参数。激光熔覆搭接率为50%或25%时,均可以获得连续致密的熔覆层,50%的搭接率适合进行单次厚度较大的熔覆,可以一次性产生一定厚度的连续致密熔覆层;25%的搭接率适合进行多次激光熔覆,产生厚度较小但相对平整性更好的连续致密熔覆层,方便黏结后续的熔覆材料,避免不同部位熔覆材料厚度的差异对熔覆层产生影响。二次重熔处理可以有效减小熔覆层表面高低落差。

In order to improve the smoothness of the cladding layer of graphite/copper self-lubricating material,the effect of laser cladding lap ratio on the smoothness of the cladding layer and the improvement effect of secondary remelting treatment on the cladding layer were investigated.The results show that the laser lap ratio of 75% is not suitable for the actual processing parameters.When the lap ratio of laser cladding is 50% or 25%,continuous dense cladding layer can be obtained.When the lap ratio of 50% is suitable for a single cladding with large thickness,continuous dense cladding layer of a certain thickness can be produced at one time.The lap ratio of 25% is suitable for multiple laser cladding to produce a continuous dense cladding layer with smaller thickness but better relative flatness,which is convenient to bond the subsequent cladding material and avoid the influence of the thickness difference of cladding material in different parts on the cladding layer.The secondary remelting treatment can effectively reduce the height drop of the cladding layer.