Laser coating and thermal spraying process （激光涂层和热喷涂过程）.pdf

Laser coating and thermal spraying - process basics and coating properties 1,2 1 2 P. Vuoristo , J. Tuominen , J. Nurminen , 1 Tampere University of Technology, Institute of Materials Science, Tampere / FI 2 Central Ostrobotnian Technology Centre KETEK, Kokkola / FI The paper describes the some differences of laser coating (laser cladding or laser spraying) process in comparison to thermal spraying. Laser coating is a novel coating process, which produces coatings with high density, metallurgical bonding and low heat input to the substrate. Laser coating types and coating properties are reviewed and compared with thermally sprayed coatings. Typical application areas of laser coatings are presented. 1 Introduction pretreatment, such as graphitizing of the metal surface, is frequently needed in laser transformation Laser coating, also referred as “laser cladding” or hardening of steel surfaces by a CO laser. 2 “laser spraying” (note: in this paper the process is called laser coating), is an advanced coating Tab. 1. High power lasers for laser materials technology for improving surface properties of various processing. components and equipment. These coatings have extremely dense, crack-free and non-porous Property Laser type microstructures. Laser coatings show also excellent metallurgical bonding to t