Wear mechanism and tribological characteristics of porous NiTi shape memory alloy for bone scaffold

Journal of Biomedical Materials Research - Part A - Tập 101A Số 9 - Trang 2586-2601 - 2013
Shuilin Wu1,2, Xiangmei Liu1,2, Guosong Wu1, Kwk Yeung3, Dong Zheng4, C.Y. Chung1, Zushun Xu2, Paul K. Chu1
1Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
2Hubei Province Key Laboratory for Industrial Biotechnology, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan, People's Republic of China
3Division of Spine Surgery, Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong, People's Republic of China
4Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China

Tóm tắt

The abraded debris might cause osteocytic osteolysis on the interface between implants and bone tissues, thus inducing the subsequent mobilization of implants gradually and finally resulting in the failure of bone implants, which imposes restrictions on the applications of porous NiTi shape memory alloys (SMAs) scaffolds for bone tissue engineering. In this work, the effects of the annealing temperature, applied load, and porosity on the tribological behavior and wear resistance of three‐dimensional porous NiTi SMA are investigated systematically. The porous structure and phase transformation during the exothermic process affect the tribological properties and wear mechanism significantly. In general, a larger porosity leads to better tribological resistance but sometimes, SMAs with small porosity possess better wear resistance than ones with higher porosity during the initial sliding stage. It can be ascribed to the better superelasticity of the former at the test temperature. The porous NiTi phase during the exothermic reaction also plays an important role in the wear resistance. Generally, porous NiTi has smaller friction coefficients under high loads due to stress‐induced superelasticity. The wear mechanism is discussed based on plastic deformation and microcrack propagation. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 101A: 2586–2601, 2013.

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