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

doi:10.1016/j.msec.2017.03.211

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 journal › Article › peer-review

25 Scopus citations

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 language	English (US)
Pages (from-to)	997-1004
Number of pages	8
Journal	Materials Science and Engineering C
Volume	76
DOIs	https://doi.org/10.1016/j.msec.2017.03.211
State	Published - Jul 1 2017

Keywords

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

ASJC Scopus subject areas

Bioengineering
Biomaterials

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10.1016/j.msec.2017.03.211

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title = "Effects of carbon addition on wear mechanisms of CoCrMo metal-on-metal hip joint bearings",

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.",

keywords = "Carbon addition, CoCrMo alloy, Mo-rich-carbide-induced-pitting, Wear mechanism",

author = "Yan Chen and Yunping Li and Yuichiro Koizumi and Hani Haider and Akihiko Chiba",

note = "Funding Information: The authors gratefully acknowledge financial support from the Ministry of Education, Culture, Sports, Science and Technology of Japan through the Regional Innovation Cluster Program 2010. The authors also thank I. Narida, Y. Kodama, and S. Ito for their assistance with the EDX, FIB, and TEM experiments, respectively. The authors also gratefully acknowledge the financial support from The Science Fund for Distinguished Young Scholars of Hunan Province, China (2016JJ1016). Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

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doi = "10.1016/j.msec.2017.03.211",

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AU - Chen, Yan

AU - Li, Yunping

AU - Koizumi, Yuichiro

AU - Haider, Hani

AU - Chiba, Akihiko

N1 - Funding Information: The authors gratefully acknowledge financial support from the Ministry of Education, Culture, Sports, Science and Technology of Japan through the Regional Innovation Cluster Program 2010. The authors also thank I. Narida, Y. Kodama, and S. Ito for their assistance with the EDX, FIB, and TEM experiments, respectively. The authors also gratefully acknowledge the financial support from The Science Fund for Distinguished Young Scholars of Hunan Province, China (2016JJ1016). Publisher Copyright: © 2017 Elsevier B.V.

PY - 2017/7/1

Y1 - 2017/7/1

N2 - 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.

AB - 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.

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KW - CoCrMo alloy

KW - Mo-rich-carbide-induced-pitting

KW - Wear mechanism

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

Abstract

Keywords

ASJC Scopus subject areas

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