Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 9 No. 3 September 1999|
（School of Materials Science and Engineering,Huazhong University of Science and Technology, Wuhan 430074, P. R. China）
Abstract:Perfect composite coatings have been successfully produced with preplaced mixture of Cu+Al2O3(2%~20%) on AISI 1045 steel substrate by using a 2kW CO2 laser. A suitable amount of Al2O3 in Cu as additive can improve the processing conditions of laser cladding. Fe-rich particles were observed in the clad layer during microstructural observation with SEM and chemical composition analysis by EDAX. The experimental results showed that microhardnesses of the coatings were over 150HV0.05 and the electric resistivities were about 4.0×10-8~4.5×10-8 Ω·m.
Key words: laser; cladding; conductive coating; microhardness tests; resistance