Processing of a Novel Zn Alloy Micro-Tube for Biodegradable Vascular Stent Application

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• 作者：Chang Wang¹ ; Zhentao Yu¹ ; ^{yzt@c-nin.com" class="auth_mail" title="E-mail the corresponding author} ; Yajun Cui¹ ; ² ; Yafeng Zhang¹ ; Sen Yu¹ ; Gongqi Qu³ ; Haibo Gong³
• 关键词：Zn alloy ; Micro-tube ; Biodegradable stent ; Mechanical properties ; Dimensional accuracy ; In vitro corrosion performance
• 刊名：Journal of Materials Science & Technology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：32
• 期：9
• 页码：925-929
• 全文大小：1652 K

文摘

In recent years, zinc based alloys as a new biodegradable metal material aroused intensive interests. However, the processing of Zn alloys micro-tubes (named slender-diameter and thin-walled tubes) is very difficult due to their HCP crystal structure and unfavorable mechanical properties. This study aimed to develop a novel technique to produce micro-tube of Zn alloy with good performance for biodegradable vascular stent application. In the present work, a processing method that combined drilling, cold rolling and optimized drawing was proposed to produce the novel Zn–5Mg–1Fe (wt%) alloy micro-tubes. The micro-tube with outer diameter of 2.5 mm and thickness of 130 µm was fabricated by this method and its dimension errors are within 10 µm. The micro-tube exhibits a fine and homogeneous microstructure, and the ultimate tensile strength and ductility are more than 220 MPa and 20% respectively. In addition, the micro-tube and stents of Zn alloy exhibit superior in vitro corrosion and expansion performance. It could be concluded that the novel Zn alloy micro-tube fabricated by above method might be a promising candidate material for biodegradable stent.