2013 Fiscal Year Final Research Report
Formation of porous surface on NiTi and suppression of Ni ion release
| Project/Area Number |
24656430
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Material processing/treatments
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| Research Institution | Tohoku University |
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Principal Investigator |
UEDA Kyosuke 東北大学, 工学(系)研究科(研究院), 助教 (40507901)
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| Co-Investigator(Renkei-kenkyūsha) |
NARUSHIMA Takayuki 東北大学, 大学院工学研究科, 教授 (20198394)
KATO Hidemi 東北大学, 金属材料研究所, 准教授 (80323096)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | ニッケルチタン / ポーラス / アナターゼ / イオン溶出 / 表面改質 / 光触媒 / 水接触角 / 傾斜機能 |
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| Research Abstract |
A dealloying Ni surface having a porous structure was prepared from NiTi alloys through immersion in molten metals. The concentration of Ni from the NiTi substrate to the surface was decreased in a stepwise manner forming an inner Ti2Ni layer and outer alpha-Ti layer on the substrate. The amounts of metallic ions eluted from these specimens to 1mass% lactic acid solution were evaluated. Despite the increased surface area of the dealloyed specimen, Ni ion elution was suppressed to the same level as that in the non-treated NiTi substrate. The anatase layer formed by two-step thermal oxidation suppressed the Ni ion release from the dealloyed substrate.
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