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Electrolytic ZrO2 coating on Co-Cr-Mo implant alloys of hip prosthesis

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3 Author(s)
Yen, S.K. ; Inst. of Mater. Eng., Nat. Chung-Hsing Univ., Taichung, Taiwan ; Guo, M.J. ; Zan, H.Z.

An electrolytic ZrO2 gel has been coated on ASTM F-75 Co-Cr-Mo alloy specimens in 0.1 M ZrO(NO3)2 solution at pH 2.2 and a current density of 2 mA/cm2. The electrolytic ZrO2 gel coating was annealed at 623-973 K for 120 min. in air, then evaluated by electrochemical polarization in Hank's solution, wear tests with UHMWPE (ultra-high molecular-weight polyethylene) under a load stress of 50 Mpa, scratch tests, and morphology observations. The crystal structures of cobalt oxide and ZrO 2 were analyzed by XRD (X-ray diffraction). The ZrO2 -coated specimen annealed at 773 K for 120 min shows a good adhesion of 610 MPa on Co-Cr-Mo substrate, a lower wear loss of UHMWPE and a higher protection potential than the uncoated specimen in Hank's solution. A monoclinic structure with (1¯11) preferred orientation parallel to the sheet plane was observed at 623 K⩽T⩽673 K while a tetragonal structure of ZrO2 was detected at T⩾773 K. For T⩾973 K, a more stable monoclinic structure with random orientation mixed with a tetragonal structure was observed

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Intelligent Processing and Manufacturing of Materials, 1999. IPMM '99. Proceedings of the Second International Conference on  (Volume:2 )

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