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dc.contributor.authorNoorhafiza, Muhammad-
dc.contributor.authorLi, Lin-
dc.date.accessioned2016-11-30T08:14:39Z-
dc.date.available2016-11-30T08:14:39Z-
dc.date.issued2012-06-
dc.identifier.citationApplied Physics A: Materials Science and Processing, vol.107 (4), 2012, pages 849-861en_US
dc.identifier.issn0947-8396 (print)-
dc.identifier.issn1432-0630 (online)-
dc.identifier.urihttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/44254-
dc.descriptionLink to publisher's homepage at http://link.springer.comen_US
dc.description.abstractMicroprofiling of medical coronary stents has been dominated by the use of Nd:YAG lasers with pulse lengths in the range of a few milliseconds, and material removal is based on the melt ejection with a high-pressure gas. As a result, recast and heat-affected zones are produced, and various post-processing procedures are required to remove these defects. This paper reports a new approach of machining stents in submerged conditions using a 100-fs pulsed laser. A comparison is given of dry and underwater femtosecond laser micromachining techniques of nickel- titanium alloy (nitinol) typically used as the material for coronary stents. The characteristics of laser interactions with the material have been studied. A femtosecond Ti:sapphire laser system (wavelength of 800 nm, pulse duration of 100 fs, repetition rate of 1 kHz) was used to perform the cutting process. It is observed that machining under a thin water film resulted in no presence of heat-affected zone, debris, spatter or recast with fine-cut surface quality. At the optimum parameters, the results obtained with dry cutting showed nearly the same cut surface quality as with cutting under water. However, debris and recast formation still appeared on the dry cut, which is based on material vaporization. Physical processes involved during the cutting process in a thin water film, i.e. bubble formation and shock waves, are discussed.en_US
dc.language.isoenen_US
dc.publisherSpringer-Verlagen_US
dc.subjectCoronary stentsen_US
dc.subjectDry cuten_US
dc.subjectFemtosecond laser micromachiningen_US
dc.subjectFemtosecondsen_US
dc.subjectLaser interactionen_US
dc.subjectMaterial removalen_US
dc.subjectMelt ejectionen_US
dc.subjectNitinol tubesen_US
dc.subjectPulse durationsen_US
dc.subjectRepetition rateen_US
dc.subjectThin water filmsen_US
dc.subjectUnder wateren_US
dc.titleUnderwater femtosecond laser micromachining of thin nitinol tubes for medical coronary stent manufactureen_US
dc.typeArticleen_US
dc.identifier.urlhttp://link.springer.com/article/10.1007/s00339-012-6795-8-
dc.identifier.doi10.1007/s00339-012-6795-8-
dc.contributor.urllin.li@machester.ac.uken_US
dc.contributor.urlNoorhafiza.Muhammad@postgrad.machester.ac.uken_US
Appears in Collections:Noorhafiza Muhammad, Assoc. Prof. Ts. Dr.

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