Abstract
Al 2O 3 and Al/Al 2O 3 composite coatings were prepared by atmospheric plasma spraying. The wear and friction properties of both coatings were evaluated under different degrees of severity using a block-on-ring arrangement. It was found that the wear resistance of the Al/Al 2O 3 composite coating was superior to that of the Al 2O 3 coating. The improvement in wear resistance of the Al/Al 2O 3 composite coating was attributed to its higher fracture toughness and adhesion strength as well as better thermal diffusivity. As for the Al/Al 2O 3 composite coating, the mechanism was mainly adhesion with micro-abrasion and fatigued-induced brittle fracture within splats, and the delamination along splat boundaries only occurred at high load. However, the failure of the Al 2O 3 coating was predominantly detachment of transferred film and brittle fracture within the splats and delamination along splat boundaries, which were enhanced with the increasing load.
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