医療用Ｔｉ‐１０％Ｃｒ‐（０，３，６）％Ａｌ合金の諸特性に及ぼす表面修飾の影響
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Two types of surface modifications such as chemical-hydrothermal and NaOH heat treatments were carried out in Ti–10Cr–0, 3 and 6 Al alloys. The effect of heat treatment accompanied by the modifications on several properties of substrates was also investigated. The Ti alloys were chemically treated with H2O2/HNO3 solutions at 353 K for 2 h. The specimens were then hydrothermally treated with an aqueous Ca(OH)2 in an autoclave at 453 K for 12 h. Homogeneous CaTiO3 films could be obtained on all substrates. On the other hand, TiO2 and Na2TiO3 composite films could be obtained by the NaOH heat treatment. After the chemical-hydrothermal treatment, the hardness of substrates was hardly changed though a small amount of isothermal ω was confirmed to form in Ti–10Cr–0 and 3 Al alloys. In contrast, all the present alloys were hardened due to α phase precipitation after the NaOH treatment. A small amount of hydroxyapatite precipitation could be observed on the non-surface modified substrates after 4 days immersion in simulated body fluid. In contrast, the precipitation was confirmed to occur in only 2 days on the CaTiO3 films. Thus, the combined chemical-hydrothermal treatment promoted the deposition of hydroxyapatite on the surfaces while maintaining the original properties of substrates.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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