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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

13 Scopus Citations
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Author(s)

  • Shuilin Wu
  • Xiangmei Liu
  • Guosong Wu
  • Kelvin W.K. Yeung
  • Dong Zheng
  • Z. S. Xu

Detail(s)

Original languageEnglish
Pages (from-to)2586-2601
Journal / PublicationJournal of Biomedical Materials Research - Part A
Volume101 A
Issue number9
Publication statusPublished - Sep 2013

Abstract

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. Copyright © 2013 Wiley Periodicals, Inc.

Research Area(s)

  • bone scaffold, NiTi shape memory alloys, phase transformation, porous, tribological behavior

Citation Format(s)

Wear mechanism and tribological characteristics of porous NiTi shape memory alloy for bone scaffold. / Wu, Shuilin; Liu, Xiangmei; Wu, Guosong; Yeung, Kelvin W.K.; Zheng, Dong; Chung, C. Y.; Xu, Z. S.; Chu, Paul K.

In: Journal of Biomedical Materials Research - Part A, Vol. 101 A, No. 9, 09.2013, p. 2586-2601.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review