Assessment of characteristics and cytotoxic effects of 316L stainless steel coated with a new titanium oxide nano-structure coating method

• Published in: Dental Materials Journal Vol. 38; no. 4; pp. 604 - 610
• Main Authors: HE, Xiaoxi, VALANEZHAD, Alireza, WATANABE, Ikuya, YOSHIDA, Noriaki
• Format: Journal Article
• Language: English
• Published: Japan The Japanese Society for Dental Materials and Devices 26.07.2019; Japan Science and Technology Agency
• Subjects: Adhesion; Adhesive strength; Adhesives; Anatase; Aqueous solutions; Austenitic stainless steels; Chemical treatment; Coating; Coatings; Color; Crystal structure; Cytotoxicity; Dentistry; Diffraction patterns; Heat treatment; Metals; Nano-structure; Organic chemistry; Powder; Stainless steel; Titanium dioxide; Titanium oxide; Titanium oxides; Toxicity; X-ray diffraction; Cytotoxicity; Titanium oxide; Adhesion; Color; Nano-structure
• ISSN: 0287-4547; 1881-1361
• DOI: 10.4012/dmj.2018-273

In order to fabricate the TiO2 nano-structure coating on the Ti-free stainless steel with good adhesion, commercially obtained 316L stainless steel (316L SS) plates were chemically treated by KOH aqueous solution including TiH2 powder at 60ºC for 3 days in an oil bath shaker, and subsequently heated up to 550–800ºC under the air atmosphere. The crystal structure, color, adhesive strength and cytotoxic effects of coating were investigated. Fiber-like hydrogen titanate nano-structures were formed on the 316L SS surface and made a fine network. X-ray diffraction (XRD) patterns showed that hydrogen titanate phase converted to anatase and rutile after heat treatment above 550ºC. The heat treated sample at 800ºC for 1 h showed the highest adhesive strength and the lowest cytotoxicity. The alkali treatment method in this study is expected to be used on the other Ti-free metals with further research.