Effect of low temperature annealing on the wear properties of NITINOL

2nd International Manufacturing Engineering Conference; 3rd Asia-Pacific Conference on Manufacturing Systems

Mukunda, Sriram^1 ; Naths, Narendra^1 ; Herbert, Mervin A.^1 ; Mukunda, P.G.^2

Dept. of Mechanical Engineering, NITK, Surathkal, Mangalore

575025, India^1

Dept. of Mechanical Engineering, NMIT, Bangalore

560064, India^2

关键词: Adhesive wear tests;    Biomedical applications;    Cardiovascular stents;    Low temperature aging;    Low temperature annealing;    NiTi shape memory alloys;    Properties and microstructures;    Root canal treatment;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/114/1/012119/pdf
DOI  :  10.1088/1757-899X/114/1/012119

来源: IOP

【 摘 要 】

NiTi shape memory alloy is a wonder material that is a solution looking for problems. The material finds wide biomedical applications like endodontic files for root canal treatment and cardiovascular stents. This material has rendered the surgical procedure simple compared to that with the existing Stainless Steel (SS) or titanium ones. NiTi as an endodontic file would cause less discomfort to the patients in comparison to that with far stiffer SS or titanium ones. Here nearly equi-atomic 50:50 commercial NiTi rods were subjected to low temperature aging at 300 to 450°C. The wear resistance of the as-received and the heat-treated samples was studied using adhesive wear tests on hardened steel counter face. Abrasive wear tests were run against Alumina disc to simulate the working of endodontic drills and files against dental hard and soft tissues. The abrasive wear resistance is expected to be proportional to the Vickers Hardness of the material and is high for the 450°C heat-treated sample. A correlation between the mechanical properties and microstructures of this material is attempted.