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

Abstract

Hydroxyapatite (HAP)-coated implants on metallic substrates have been used as biomaterials. The problem is that HAP coating on metallic substrates is easily exfoliated at the boundary between HAP and metallic substrates, i.e. titanium (Ti). Therefore, Ti-HAP Functionally Graded Coating (FGC) is considered to improve adhesion of Ti-HAP coatings. In this paper, preparation of Ti-HAP FGC is studied in detail by using the well-controlled DC plasma jet. Properties of Ti-HAP FGC films (i.e. the c-axis orientation, the bond strength and the hardness) are also discussed in relation to spraying conditions.

Hydroxyapatite coatings prepared by a high power laminar plasma jet

“…The coating's crystallinity is improved at the same time. Kou et al (2008) got HA coating of good microstructure by using the originally designed PG of a "forced constricted type". Working at a low power within the range from 4 to 6 kW, the significant decomposition of HA particles, with 30 m powder granulation, could not be avoided.…”

Plasma coating of hydroxyapatite

“…Kou et al [10] got HA coating of a good microstructure using the originally designed PG of a 'forced constricted type'. Working at a low power within the range from 4 to 6 kW, the …”