Hydroxyapatite Coating Using DC Plasma Jet

Abstract

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.

Production of fine hydroxyapatite films using the well-controlled thermal plasma

“…Therefore, feeding rate of HAP powders in the middle coat becomes higher and process time of HAP coating is longer than one in the previous result [8].…”

“…We have reported that adhesion strength of prepared films is increased with increasing W j [8]. However, HAP is decomposed when W j is high.…”

“…To melt HAP powder at the low jet power, HAP powders with small diameter are used compared with a previous one [8].…”

“…So far, we have succeeded in preparation of Ti-HAP FGC films. Based on the previous results [8], in this paper we further study improvement of Ti-HAP FGC films (i.e. c-axis orientation, the adhesion strength and the hardness) and briefly discuss the optimum condition for preparation.…”