Improvement of mechanical properties and transformation behavior of NiTi drawn wires for orthodontics applications

Conference proceedings article

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Noonai N., Khantachawana A., Kaewtathip P., Kajornchaiyakul J.

ผู้เผยแพร่: Trans Tech Publications

ปีที่เผยแพร่ (ค.ศ.): 2012

Volume number: 378-379

หน้าแรก: 623

หน้าสุดท้าย: 627

จำนวนหน้า: 5

ISBN: 9783037852880

นอก: 1022-6680

eISSN: 1662-8985

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-80955125819&doi=10.4028%2fwww.scientific.net%2fAMR.378-379.623&partnerID=40&md5=76a0e34fd659c17b040fa263f3cbb0cf

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

NiTi shape memory alloy is widely used in dental applications such as orthodontics arch wire, mini screw implant, orthodontics spring, etc., because of its favorable superelasticity and shape memory effect. Wire drawing is a fundamental manufacturing process used for producing orthodontics arch wires. It is well known that cold-work occurred during wire drawing operation is also important to control mechanical properties and transformation temperature of NiTi wires. Thus, the purpose of this work is to study the effect of cold working by means of reduction ratio of cross - sectional area and heat-treatment temperatures on transformation and mechanical behavior of the drawn wires for utilized as orthodontic wires. The wire material used in this study is Ni 51.4Ti48.6 (at%) alloy with various initial diameters with targeted wire diameter of 0.51mm (0.02 inch). The die for wire drawing is made of tungsten carbide which is inserted into a steel case. The dies were designed to have different reduction ratio of cross sectional area for 4 levels; 10%, 20%, 30% and 40%, respectively. The lubricant used in this study is sodium stearate powder. In order to investigate the influences of heat-treatment temperatures, the drawn wires are heat-treated at 400 ฐC and 600 ฐC for 3.6ks. The results showed that percentages of reduction of cross sectional area and heat-treatment temperature strongly affect mechanical properties and transformation temperatures. Superelasticity was confirmed in an alloy heat-treated at 400 ฐC. The results obtained can be used to determine the optimum properties of NiTi wire in order to utilized as orthodontics arch wires.

คำสำคัญ

Cold working, NiTi arch wire, Phase Transformation, Reduction ratio, Shape memory alloy