Effect of critical plasma spray parameter on complex permittivity and microstructure by plasma spraying Cr/Al2O3 coatings

► Deposit the Cr/Al2O3 coatings for microwave absorbing application. ► We study the effects of CPSP on the complex permittivity. ► Increasing CPSP content enhance the complex permittivity. ► The reflection loss varies with changes of coatings thickness and Fe amount.