| Project/Area Number |
09359003
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
広領域
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
HAMANAKA Hitoshi Tokyo Medical and Dental University, Institute of Biomaterials and Bioengineering, Professor, 生体材料工学研究所, 教授 (10013955)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Equo Tokyo Medical and Dental University, Institute of Biomaterials and Bioengineering, Research associate, 生体材料工学研究所, 助手 (40242268)
DOI Hisashi Tokyo Medical and Dental University, Institute of Biomaterials and Bioengineering, Research associate, 生体材料工学研究所, 助手 (30251549)
YONEYAMA Takayuki Tokyo Medical and Dental University, Institute of Biomaterials and Bioengineering, Associate professor, 生体材料工学研究所, 助教授 (00220773)
ASAI Masato Furukawa Electric Co., ltd., 主任研究員
SUZUKI Yuichi Furukawa Electric Co., ltd., 所長
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥20,200,000 (Direct Cost: ¥20,200,000)
Fiscal Year 1999: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1998: ¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1997: ¥9,300,000 (Direct Cost: ¥9,300,000)
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| Keywords | Ti-Ni alloy / mechanical properties / Corrosion resistance / dental casting |
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| Research Abstract |
Ti-Ni alloy exhibits superior functional property among all shape memory alloys. Nevertheless, a small amount of dissolution of nickel (Ni) from this alloy concerns biocompatibility. In this study, the substitution of the third elements such as palladium (Pd), copper (Cu) and gold (Au), for Ni was investigated to decrease Ni ion release from Ti-Ni alloy which possesses shape memory effect and super-elasticity.
Pd addition of 7.5% (mass%) to Ti-50.0Ni alloy showed flexible super-elasticity, which exhibited approximately a half apparent (0.2%) proof stress comparing with the binary super-elastic Ti-Ni alloy. With the increase of Cu substitution, both the lower apparent proof stress and residual strain were observed. Moreover, enlarged content of super-elastic range was obtained by Cu addition to binary shape memory Ti-Ni alloy. 10% Cu addition of binary Ti-Ni alloy was promising composition of super-elasticity at body temperature, and exhibited less Ni ion release in the result of immersion test of the 1% lactic acid at 310K. With the increase of Au substitution, transformation temperatures decreased up to the 7% Au addition and indistinguishable in the further addition by DSC measurement. 49.4%Ti-Ni-4%Au and 49.6%Ti-Ni-7%Au alloy were proved to show super-elasticity at body temperature. Furthermore, 0.5 mass% Mo or Cr addition to the 10% Cu added Ti-Ni alloy seemed the limit in relation to mechanical properties since 1.0 mass% or more addition of Mo or Cr to the alloy showed brittleness.
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