Formation of Amorphous Fe-Cr-P-C Alloy Coating Films by a Newly Developed Thermal Spraying Technique

Abstract

Some amorphous Fe-Cr-P-C coating films having high hardness and high corrosion resistance have been produced by a newly developed thermal spraying technique. In order to control the temperatures of the powder particles in the flame spray and the substrate, a newly developed cylindrical nozzle, with external cooling nitrogen gas, was mounted to the front end of the thermal spray gun. Fe70Cr10P13C7 films with various external cooling gas velocities between 20 m/s and 40 m/s exhibited entire amorphous structure without oxides and/or unmelted particles. Corrosion-resistance of the films was observed in immersion tests using various corrosive liquids.

Influence of Substrate Temperature on Structure and Adhesion Strength of Fe–Cr–P–C Amorphous Coating Films Produced by Thermal Spraying Technique

“…Figure 2(a) shows the tensile test specimen. The substrate was bonded to an aluminum dolly with an effective area of 314 mm 2 and a diameter of 20 mm using the 3M Company adhesive agent AF163-2, and then it was annealed at 120°C for two hours to harden the agent. Figure 2(b) shows the assembly diagram of the tensile test jig and tensile test specimen.…”