Advanced Stellite alloys with improved metal-on-metal bearing for hip implants |
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| Affiliation: | 1. Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada;2. Kennametal Stellite Inc., P.O. Box 5300, Belleville, Ontario K8N 5C4, Canada;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. The 14th Research Institute, China Electronics Technology Group Corporation, Nanjing 210013, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, PR China;2. College of Applied Science, Harbin University of Science and Technology, Harbin, PR China;3. College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin, PR China;1. CEMUC, Department of Mechanical Engineering, University of Coimbra, Polo II, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal;2. CT2M, Department of Mechanical Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, PR China;2. Shaanxi HanDe Axle Co., Ltd., Xi’an 710201, PR China |
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| Abstract: | Stellite 21 is a low-carbon Co–Cr–Mo alloy that has been used for hip implants for decades. The Stellite 21 implants can fail when the femoral head and the acetabular cup loosen because of limited metal-on-metal bearing. Two modified Stellite 21 alloys with better bearing capacities are proposed as replacements in this study: Cr-modified Stellite 21 with additional 10 wt.% Cr, and N-modified Stellite 21 with addition of 0.5 wt.% CrN. The wear and corrosion resistances of these alloys were investigated in simulated conditions experienced by hip implants in human bodies. The experimental results show that the proposed alloys all exhibit better wear resistance than the conventional hip implant material, but only Cr-modified Stellite 21 displays better corrosion resistance, thus this alloy should be considered for use in future hip implants. |
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| Keywords: | Stellite alloy Pin-on-disk wear Hank’s solution corrosion Hip implant |
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