Product Code: PIC2008_P144

Microstructure and Properties of Laser Remelted Ni-Based Alloy Self-Lubricating Hvof Spraying Coating
Authors:
A.H. Wang, Huazhong University of Science and Technology; Wuhan Peoples Republic of China
X.F. Zhang, Huazhong University of Science and Technology ; Wuhan Peoples Republic of China
X.L. Zhang, Huazhong University of Science and Technology ; Wuhan Peoples Republic of China
H.G. Xu, Huazhong University of Science and Technology ; Wuhan Peoples Republic of China
Z.W. Huang, Huazhong University of Science and Technology ; Wuhan Peoples Republic of China
Presented at PICALO 2008

A process of HVOF spraying and laser remelting of a Ni-based alloy nano-hBN powder to form a coating on AISI1045 steel was carried out. Microstructure and frictional properties of HVOF spraying and laser remelted coating were studied. Lamellar structure was obtained in HVOF spraying process, high porosities and lower bonding strength. During the laser remelting process, a reaction between hBN and Ni occurred, and generated a hard phase Ni3B. Moreover, some carbides deposited in the laser remelted layer. Results show that laser remelting can greatly improve the microstructure of HVOF sprayed nickel-hBN composite coatings. The remelted coatings with hard phases and lubricant have uniform and densified microstructure, firm interface and higher wear resistance.