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Hydroxyapatite Coating Using DC Plasma Jet

Hydroxyapatite (HAP)-coated implants on metallic substrates have been used as biomaterials. The problem is that the HAP coating on metallic substrates is easily exfoliated at the boundary between HAP and metallic, e.g., titanium (Ti) substrates. Therefore, a Ti–HAP functionally graded coating (FGC) is considered to improve the adhesion of Ti–HAP coatings. In this paper, Ti–HAP FGC is tested using a well-controlled DC plasma jet and discussed. It is confirmed that Ti–HAP FGC films with good adhesion within three layers are prepared.