Cr_3C_2-Ni-Cr coating properties of HVOF-YAG hybrid spraying and its strengthening mechanism(Physics, Processes, Instruments & Measurements)

概要

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Although thermal spraying technique is used in many industries, it suffers from several problems. For example, the hardness of the coatings is lower than that of sintered materials with incomplete cohesiveness. An yttrium aluminum garnet (YAG) laser was used during HVOF spraying to improve the properties of the applied coating. Cr_3C_2-Ni-Cr powder was used as thermal spray material, and stainless steel (SUS304) used as substrate. Coatings were sprayed by a hybrid spraying method, which was combined HVOF spraying with YAG laser. The hardness of coatings sprayed by hybrid spraying was higher and the weight loss in a blast-erosion test was smaller than that of coatings applied by HVOF spraying only. The particles deposited in the coatings obtained by hybrid spraying were very fine. Laser irradiation applied to the HVOF flame improved the adhesion strength between particles and the deposition of fine carbide particles in the coating. It was considered that mechanism of coating strengthening in hybrid spraying resulted from strengthening of cohesiveness by heating effects and decreasing of porosity by flattening effects according to observation results of Ni splats sprayed by the hybrid spraying method.
大阪大学の論文