5-2005-Fretting behavior of cortical bone against titanium and its alloy.pdf

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5-2005-Fretting behavior of cortical bone against titanium and its alloy.pdf

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5-2005-Fretting behavior of cortical bone against titanium and its alloy

Wear 259 (2005) 910–918 Fretting behavior of cortical bone against titanium and its alloy H.Y. Yu a,b , Z.B. Cai a , Z.R. Zhou a,? , M.H. Zhu a a Tribology Research Institute, Key Laboratory of Advanced Technologies of Materials, Southwest Jiaotong University, Chengdu 610031, China b West China College of Stomatology, Sichuan University, Chengdu 610041, China Received 29 July 2004; received in revised form 20 December 2004; accepted 31 January 2005 Available online 10 May 2005 Abstract Under the lubrication by the imitated human physiological solution, the fretting behaviors of flat cortical bone were investigated against titanium (TA2) and its alloy (TC4) ball counterpart. The friction logs and coefficients were recorded automatically. The worn surfaces of cortical bone were analyzed by means of laser confocal scanning microscopy. The results show that friction logs transform from partial slip directly to gross slip without mixed regime. The wear depths of bone generally increase with the friction coefficient. The worn scar area on bone is a little bit larger than that on ball surface. The wear depths on Ti ball were only several micrometers, which were much less than t c t r ? K 1 l r t t o m t t i f b m u s 0 dhose on bone. The comparison of fretting behaviors between the bone-TA2 pair and bone-TC4 pair were of particular interest. The friction oefficient of bone-TC4 pair is higher than that of bone-TA2 pairs. The maximum wear depth on bone against TA2 is about 40% the value of hat on bone against TC4. The wear adaptability of bone-TA2 pair is better than that of bone-TC4 pair. The abrasive wear and delamination elated to the microstructure of bone are observed on the wear scar of cortical bone. 2005 Elsevier B.V. All rights reserved. eywords: Fretting wear; Cortical bone; Femur; Titanium; Mechanism . Introduction Biomechanical influences play an important role in the ongevity of bone around implants. Bone tissue is known to emodel its structure in response to me