PMID: 15348592Sep 7, 2004Paper

Friction and wear of hydroxyapatite reinforced high density polyethylene against the stainless steel counterface

Journal of Materials Science. Materials in Medicine
M WangW Bonfield

Abstract

Hydroxyapatite (HA) reinforced high density polyethylene (HDPE) was invented as a biomaterial for skeletal applications. In this investigation, tribological properties (e.g. wear rate and coefficient of friction) of unfilled HDPE and HA/HDPE composites were evaluated against the duplex stainless steel in dry and lubricated conditions, with distilled water or aqueous solutions of proteins (egg albumen or glucose) being lubricants. Wear tests were conducted in a custom-built test rig for HDPE and HA/HDPE containing up to 40 vol % of HA. It was found that HA/HDPE composites had lower coefficients of friction than unfilled HDPE under certain conditions. HA/HDPE also exhibited less severe fatigue failure marks than HDPE. The degradation and fatigue failure of HDPE due to the presence of proteins were severe for low speed wear testing (100 rpm) as compared to high speed wear testing (200 rpm). This was due possibly to the high shear rate at the contact which could remove any degraded film instantaneously at high sliding speed, while with a low sliding speed the build-up of a degraded layer of protein could occur. The degraded protein layer would stay at the contact for a longer time and mechanical activation would induce adverse reac...Continue Reading

Citations

Oct 10, 2006·Artificial Organs·C James KirkpatrickRonald E Unger
Apr 3, 2007·Journal of Biomedical Materials Research. Part a·Shekhar NathBikramjit Basu

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