FORMATION OF METAL-CERAMIC LAYER ON ALUMINIUM ALLOY (A1-12Si) BY LASER PROCESSING

摘要

An aluminum alloy (Al-12Si) was laser surface treated with various compositions of Ni-SiC to produce a composite layer for improving its surface properties. The Ni-SiC composite layer was found to be formed when the coating composition was about 25-75 %wt under the laser processing used. The thickness of the layer is about 120 microns. The composite layer exhibits hardness of about 395 HV which is nearly 4 times higher than the Al-12Si aluminum alloy. The paper discusses the microstructure, microhardness and XRD studies made on the laser treated samples.