View of improvement of Quality of life (QOL) for senior citizens, the implant treatment that embed prosthesis into a living body has advanced as a method of treating for deterioration or a lesion part. Titanium is one of major metal materials for implant and has the helpful feature called “Osseointegration” which is bonding phenomenon to living bone directly. However, Osseointegration needs to 2 ∼ 3 months of no-load state for fixing between implants and living bones. Therefore, the addition technique of biocompatible coatings, mainly Hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂, HAp) , onto the surface of titanium alloy implants has been developed to reduce duration of fixing period between implants and living bones and to improve the strength of treated part. In addition, such coatings have another function as the barriers to protect corrosion from living body environment and to prevent release metallic ions from implants. This paper introduces past and current research status of biocompatible coatings related issue, i.e., its corrosion barrier function, fabrication methods and each feature, influences of investigation environment ( “in vitro” or “in vivo” and “clinical” ) , structure-complexable and multi-functionalization.

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We have developed a new nanomaterial processing method that is both low-cost and environmentally friendly to meet the SDGs. In this method, oxides are used as raw materials and nanomaterials are synthesized in a solid-liquid system. By utilizing non-equilibrium reaction fields such as ultrasound and microwaves in the solid-liquid system, nanomaterials can be synthesized at low temperatures with high throughput. In this review, we will introduce the nanomaterial synthesis process, which is characterized by no waste generation, high concentration without washing, and dispersant-free, etc..

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In order to develop a low cost and environmentally friendly atmospheric plasma spray (APS) process for deposition of oxide ceramic film coatings, a low power atmospheric air plasma spray (AAPS) equipment was developed and TiO₂ film deposition using the developed AAPS equipment was carried out. Consequently, it was proved that even under 2kW class AAPS equipment could deposit lamellar structure TiO₂ film. Besides, since stable feedstock powder feeding can be conducted by using hour glass (separation fennel) type feedstock powder system and / or impeller type feedstock powder system, large area uniform TiO₂ films could be deposited on the conditions of traversing substrate. From these results, this AAPS equipment was proved to have high potential for low cost oxide film deposition.

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