Characteristics of gas-tunnel plasma-sprayed coatings

Abstract
The quality of Al2O3 coatings formed by gas-tunnel plasma-spraying apparatus has been evaluated with respect to hardness and porosity under various spraying conditions. The deposit characteristics of Al2O3 powder sprayed onto a substrate by this type of plasma spraying were also studied and the relation between the deposit characteristics and the spraying distance was investigated. Estimation of the deposit characteristics was found to be a very effective method for determining the proper spraying conditions under which a good quality coating can be obtained.

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