Multipass cold drawing of magnesium alloy minitubes for biodegradable vascular stents.
Multipass cold drawing of magnesium alloy minitubes for biodegradable vascular stents.
复制标题
用于可生物降解血管支架的镁合金微型管的多道冷拔。
DOI：
10.1016/j.msec.2013.04.039
复制
发表时间：
2013-08
期刊：
影响因子：
--
通讯作者：
Zhou, Jie
中科院分区：
文献类型：
--
作者：
Fang, Gang;Ai, Wei-jiang;Leeflang, S;er;Duszczyk, Jurek;Zhou, Jie
镁合金具有非常有限的室温成形性。这为制造用于生物可降解血管支架的微型管提出了技术障碍。本研究旨在发展精密成形技术，以制造具有精细组织的ZM21镁合金微管。成功开发了一种多道次移动芯棒冷拔工艺，通过5道次冷拔和道间退火处理，将无缝空心坯料加工成外径2.9mm、壁厚0.217mm的微细管，可用于激光切割血管支架。结果发现，在不造成断裂的情况下，材料的累积截面面积可减少32%。然而，为了进一步减小横截面面积，需要在300℃下退火1小时，将孪晶组织转变为再结晶晶粒组织，并恢复可成形性。与第四道次拉拔时的拉拔力相比，第四道次后的道间退火处理使拉拔力降低了22%。微管的外径和壁厚变化可以控制在5 μm和12μm以内。进一步的研究是为了提高尺寸精度。
Magnesium alloys possess highly limited room-temperature formabilities. This presents a technological barrier to the fabrication of minitubes for biodegradable vascular stents. The research was aimed at developing precision forming technology to fabricate ZM21 magnesium alloy minitubes with a refined microstructure. A multipass cold drawing process with a moving mandrel was successfully developed to convert seamless hollow billets through five passes of cold drawing and an interpass annealing treatment into minitubes with an outside diameter of 2.9mm and a wall thickness of 0.217mm, ready for laser cutting into vascular stents. It was found that a cumulative reduction in cross-section area as much as 32% could be applied to the material without causing fracture. However, a further reduction in cross-section area required annealing at 300°C for 1h to change a twinned microstructure into a recrystallized grain structure and to regain formability. The interpass annealing treatment after the fourth pass led to a reduction in drawing force by 22%, in comparison with the drawing force at the fourth pass of drawing. The variations in the outside diameter and wall thickness of the minitubes could be kept within 5 and 12μm, respectively. Further research is directed toward improvements in dimensional precisions.
登录
查看更多内容
DOI：
10.1016/j.jmatprotec.2007.03.084
发表时间：
2007-08-01
影响因子：
6.3
作者：
Furushima, T.;Manabe, K.
通讯作者：
Manabe, K.
影响因子：
4.7
作者：
Chao, H. Y.;Sun, H. F.;Wang, E. D.
通讯作者：
Wang, E. D.
影响因子：
0.4
作者：
Stefano FarèI;Qiang GeI;Maurizio VedaniI;Gianmarco VimercatiI;Dario GastaldiII;Francesco MigliavaccaII;Lorenza PetriniII;Stefano TrasattiIII
通讯作者：
Stefano FarèI;Qiang GeI;Maurizio VedaniI;Gianmarco VimercatiI;Dario GastaldiII;Francesco MigliavaccaII;Lorenza PetriniII;Stefano TrasattiIII
DOI：
10.1002/wnan.123
发表时间：
2011-05
影响因子：
8.6
作者：
Martinez, Adam W.;Chaikof, Elliot L.
通讯作者：
Chaikof, Elliot L.
DOI：
10.1016/j.msea.2012.06.101
发表时间：
2012-10
影响因子：
6.4
作者：
W. Ai;G. Fang;J. Zhou;M. Leeflang;J. Duszczyk
通讯作者：
W. Ai;G. Fang;J. Zhou;M. Leeflang;J. Duszczyk