ABSTRACT
ABSTRACT: Two kinds of Mo coatings were sprayed by supersonic plasma spraying and HVAS on the AISI 4340 steel in order to improve the anti-wear performance, and the microstructure was also studied. The microstructure of super plasma sprayed Mo coating showed more compact and less pores than HVAS Mo coating, and the ball-on-disc sliding wear test with heavy loading and boundary lubrication indicated that the supersonic plasma Mo coating had a better anti-wear performance as compared with that of HVAS Mo coating which made nothing much difference to the anti-wear performance AISI 4340 steel. The worn surface revealed the abrasive wear mechanism accompanied with grooves and pits of supersonic plasma sprayed Mo coating, and the worn surface of HVAS Mo coating had a serious plastic deformation with oxidation, which belongs to oxidation and adhesive wear.
