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Development and dental casting of the super-elastic alloy with superior biocompatibility

具有优异生物相容性的超弹性合金的开发和牙科铸造

基本信息

批准号：
09359003
负责人：
HAMANAKA Hitoshi
金额：
$ 12.93万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09359003/
关键词：
Ti-Ni alloy mechanical properties Corrosion resistance dental casting

项目摘要

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.

Ti-Ni合金在所有形状记忆合金中表现出优越的功能性能。然而，该合金中少量镍 (Ni) 的溶解会影响生物相容性。在本研究中，研究了用钯（Pd）、铜（Cu）和金（Au）等第三种元素替代Ni，以减少Ti-Ni合金中Ni离子的释放，该合金具有形状记忆效应和超弹性。在Ti-50.0Ni合金中添加7.5%（质量%）的Pd表现出柔性超弹性，与相比，其表现出大约一半表观（0.2%）屈服强度。二元超弹性Ti-Ni合金。随着Cu取代量的增加，观察到表观屈服强度和残余应变均较低。此外，通过在二元形状记忆Ti-Ni合金中添加Cu，获得了更大的超弹性范围含量。添加10％Cu的二元Ti-Ni合金是有希望在体温下具有超弹性的成分，并且在310K的1％乳酸浸泡试验中表现出较少的Ni离子释放。随着Au取代量的增加，转变温度下降到7% Au添加量，并且通过DSC测量在进一步添加中无法区分。 49.4%Ti-Ni-4%Au和49.6%Ti-Ni-7%Au合金被证明在体温下表现出超弹性。此外，在添加10％Cu的Ti-Ni合金中添加0.5质量％的Mo或Cr似乎对机械性能有限制，因为向合金中添加1.0质量％或更多的Mo或Cr会表现出脆性。