SENSITIVITY ANALYSIS OF ATMOSPHERIC PLASMA SPRAYING PROCESS PARAMETERS ON POROSITY OF ALUMINA COATING ON AZ31B MAGNESIUM ALLOY
Keywords:
Atmospheric Plasma Spraying, Alumina Coating, PorosityAbstract
This paper focuses on the development of empirical relationship for the prediction of porosity of plasma sprayed alumina coated AZ31B magnesium alloy. Experimental part of the study is based on five level central composite designs of three (process) parameters. In order to investigate the effects of input parameters on porosity, an empirical relationship is constructed by multiple regression analysis. A sensitivity analysis is carried out and compared the relative impact of input parameters on porosity in order to verify the measurement errors on the values of the uncertainty in estimated parameters. The results obtained show that developed empirical relationship can be applied to estimate the effectiveness of process parameters for a given porosity. The input power is more sensitive than standoff distance and powder feed rate.
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