Abstract
Cathode spots of a low-pressure arc can remove oxide layers and evaporate impurities on metal surfaces. Removal of the oxide layer using cathode spots is expected to solve recent obstacles to chemical and mechanical cleaning methods. Various phenomena of cathode spots have been investigated for pre-treatment of atmospheric pressure plasma spray (APPS). This study addressed the relation of pressure and initial surface roughness treat-ed by cathode spots of low pressure arc. The test pieces (SS 400) are compared with the ones treated by cathode spots and mechanically blasted surfaces. Results show that the roughness on the sample surfaces is most suitable at 1000 Pa of atmospheric pressure. This result can be applied for the pre-treatment of plasma spray.
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