Effects of carbon addition on wear mechanisms of CoCrMo metal-on-metal hip joint bearings

Yan Chen, Yunping Li, Yuichiro Koizumi, Hani Haider, Akihiko Chiba

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The wear behaviors of biomedical CoCrMo prosthetic alloys containing various amounts of carbon were investigated using a standard hip joint simulator in a simulated body fluid. A few chunks and punctate σ-phase precipitates were observed in the low-carbon (LC) alloy; these were responsible for the abrasion and run-in wear. Increasing the carbon content led to greater precipitation of globular M23C6-type carbides. As a result, lower wear loss was observed in the high-carbon (HC) alloy. However, the Student's t-test analysis on wear loss indicated that there was no significant difference in wear loss between the LC-LC and HC-HC combinations. Surface fatigue caused by torn-off of Mo-rich carbides was the dominant wear mechanism in the HC alloy. Further, Cr-rich carbides prevent three-body abrasion and increase the wear resistance.

Original languageEnglish (US)
Pages (from-to)997-1004
Number of pages8
JournalMaterials Science and Engineering C
Volume76
DOIs
StatePublished - Jul 1 2017

Fingerprint

Bearings (structural)
metal joints
Carbon
Metals
Wear of materials
carbon
metals
carbides
Carbides
abrasion
Abrasion
body fluids
Body fluids
Prosthetics
wear resistance
students
simulators
Wear resistance
Precipitates
precipitates

Keywords

  • Carbon addition
  • CoCrMo alloy
  • Mo-rich-carbide-induced-pitting
  • Wear mechanism

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Effects of carbon addition on wear mechanisms of CoCrMo metal-on-metal hip joint bearings. / Chen, Yan; Li, Yunping; Koizumi, Yuichiro; Haider, Hani; Chiba, Akihiko.

In: Materials Science and Engineering C, Vol. 76, 01.07.2017, p. 997-1004.

Research output: Contribution to journalArticle

Chen, Yan ; Li, Yunping ; Koizumi, Yuichiro ; Haider, Hani ; Chiba, Akihiko. / Effects of carbon addition on wear mechanisms of CoCrMo metal-on-metal hip joint bearings. In: Materials Science and Engineering C. 2017 ; Vol. 76. pp. 997-1004.
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