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Appl. Sci. 2017, 7(6), 608; doi:10.3390/app7060608

The Influences of Assisting Gas Type and Process Parameters on the Fiber Laser Microprofiling of Thin CoCr Tubes for Vascular Stents

1
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2
Jiangsu Provincial Key Laboratory for Interventional Medical Devices, Huaiyin Institute of Technology, Huai’an 223001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hamid Oughaddou
Received: 24 March 2017 / Revised: 4 June 2017 / Accepted: 7 June 2017 / Published: 12 June 2017
(This article belongs to the Section Optics and Lasers)
View Full-Text   |   Download PDF [5347 KB, uploaded 12 June 2017]   |  

Abstract

Cobalt chromium (CoCr) alloy tubes have been widely used in manufacturing of vascular stents, due to their excellent bio-mechanical properties, especially their high strength. In recent years, fiber lasers have been used in the micro-machining of vascular stents, given their better cutting quality than neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers. A comparison study of CoCr fiber laser cutting with oxygen and argon is presented, and the differences, such as surface topography, chemical composition, and kerfs geometry, between the oxygen cuts and argon cuts are studied. Three types of topographies are obtained for the oxygen cuts, and the underlying reason for the different topographies are discussed. The influences of key parameters including power, repetition rate, pulse width, and cutting speed on the cutting quality are analyzed. The present research can also provide an optimization guideline for the micro-profiling of CoCr vascular stents. View Full-Text
Keywords: CoCr alloy; vascular stents; fiber laser; optimize guideline CoCr alloy; vascular stents; fiber laser; optimize guideline
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Liu, L.; Li, D.; Tong, Y.; Zhu, Y. The Influences of Assisting Gas Type and Process Parameters on the Fiber Laser Microprofiling of Thin CoCr Tubes for Vascular Stents. Appl. Sci. 2017, 7, 608.

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