Fine particle peening (FPP) is of an abrasive jet processing in which particles less than 200 μm in diameter bombard the workpieces. While this method has been widely applied to various mechanical components to improve fatigue strength and suppress stress corrosion cracking, FPP alternatively offers novel modification effects via surface texturing as well as material transfer from the particle to the workpieces. This article first summarizes the principles and characteristics of FPP, with special emphasis on the texturing and the transfer effects, and then reviews the research aimed at applying FPP to biomaterials. The potentials of FPP as a surface modification to improve biocompatibility and provide various functions required in biomedical devices and cell culture equipments are described.

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Plasma Spray Coating technology has been widely applied for surface modification of artificial hip joint. Hydroxyapatite, TiO₂ and titanium coating are widely applied for the surface of stem and acetabular cup components. Though the coating layer is effective for enhancing stability of the joints, its effectiveness are not lasted in long-term use more than 10 years. To the worse, adverse effects, not enhancing effects of coating in long-term stability has been reported. Such instability in longterm use is due to fracture/fatigue of coating layer. Recent study of delamination of HAp coating and its functionality is provided.

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The biocompatibility of metallic implants can be greatly improved by applying plasma sprayed HAp coatings on them. In this paper, the details on preparation of HAp coatings on metallic implant materials will be described, including the preparation of plasma-ready HAp powder, plasma spraying conditions, introduction of Ti intermediate layer and the heat treatment. The evaluation of credibility, biocompatibility, and adhesion of plasma sprayed HAp coatings to metallic substrates will also be discussed.

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