Development of titanium wire ropes for implantable stimulation electrode and their evaluation

植入式刺激电极用钛钢丝绳的研制及其评价

基本信息

批准号：
16360342
负责人：
IGUCHI Yasutaka
金额：
$ 4.54万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

1. Development of titanium wore for implantable stimulation electrodes(1) α+β type Ti-4.5Al-6Nb-2Fe-2M titanium alloy was drawn to the wire with 100 μm in diameter. Anodic oxidation was effective to the oxide formation on the surface for wire drawing. In the atmospheric oxidation for oxide formation process, it was suggested that the low temperature process was preferred.(2) β type Ti-14Mo-3Nb-1.5Zr titanium alloy was drawn to the wire with 42 μm in diameter. The low temperature atmospheric oxidation was used for oxide formation process on the surface. In addition to that, the β type alloy was drawn to 100 μm in diameter using anodic oxidation, which showed the smooth surface after drawing.(3) CP titanium (4N) was drawn to the wire with 47 μm in diameter. The surface morphology of this wire was better than that of commercially available CP titanium wire with 46 μm in diameter.(4) α type Ti-10Zr titanium alloy was drawn to the wire with 51 μm in diameter, which exhibited the excellent surface smoothness and mechanical properties. The wire ropes with 7 and 7x7 strands made of Ti-10Zr titanium alloy were successfully developed.2. Evaluation(1) The maximum tensile strength and total elongation of CP titanium wire with 47 μm in diameter were 980 MPa and 3.5 %. The mechanical properties of the β type Ti-14Mo-3Nb-1.5Zr titanium alloy wire and the α type Ti-10Zr titanium alloy wire were measured.(2) The fatigue limits of the developed CP titanium wire with 47 μm in diameter and commercially available CP titanium wire with 46 μm in diameter were 200 MPa and 300 MPa, respectively. The difference of fatigue limit may be caused by the surface roughness after fatigue testing. The commercially available CP titanium wire exhibited the smoother surface than developed CP titanium wire after 10^7 cycles.

1.植入式刺激电极用钛磨损件的研制(1)将α+β型Ti-4.5Al-6Nb-2Fe-2M钛合金拉成直径100μm的丝材,阳极氧化有利于其表面氧化物的形成。在大气氧化形成氧化物的过程中，建议优先采用低温工艺。(2)β型。将Ti-14Mo-3Nb-1.5Zr钛合金拉制成直径为42μm的丝，并采用低温大气氧化进行表面氧化物形成处理，并将β型合金拉制成直径为100μm的丝。 (3)将CP钛(4N)拉制成直径为47μm的丝材，其表面形貌如图所示。该丝的性能优于市售直径46μm的CP钛丝。(4)将α型Ti-10Zr钛合金拉制成直径51μm的丝，表现出优异的表面光洁度和力学性能。研制成功Ti-10Zr钛合金7股和7×7股钢丝绳。 2．评价（1）CP最大抗拉强度和总伸长率。测试了β型Ti-14Mo-3Nb-1.5Zr钛合金丝和α型Ti-10Zr钛合金丝的力学性能，直径为47μm的钛丝为980MPa和3.5%。(2)疲劳性能。所开发的直径为47μm的CP钛丝和市售的直径为46μm的CP钛丝的极限值为200疲劳极限的差异可能是由疲劳测试后的表面粗糙度引起的，在 10^7 次循环后，市售的 CP 钛丝表现出比开发的 CP 钛丝更光滑的表面。