Friction and wear of cobalt-molybdenum and cobalt-molybdenum-chromium alloys for prosthetics
Robert L. Johnson, Max A. Swikert, United States. National Aeronautics and Space Administration, Lewis Research Center
National Aeronautics and Space Administration, 1971 - Medical - 17 pages
Studies were conducted in heptane with cobalt alloys on a disk-and-conforming-shoe apparatus simulating the single motion of a human hip joint. The results showed that cobalt-molybdenumchromium alloys were brittle; that the surface finished by grinding fragmented locally; and that, subsequently, abrasion of sliding surfaces occurred. When the ground surfaces were altered by glass-bead blasting, fragmentation during the wear process was minimized. Particles loosened by the grinding.process were removed, and the bead-blasted surface provided pockets to entrap debris. Friction and wear for the bead-blasted cobalt-molybdenum-chromium alloy were significantly lower than for vitallium.
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0001 Weight loss ALLOYS FOR PROSTHETICS alloys with ground alloys with hexagonal argon blasted surface blasting process chromium alloy cobalt alloys cobalt-chromium alloy cobalt-molybdenum alloy cobalt-molybdenum-chromium alloy surfaces coefficient of friction disk specimen entrap debris Figure 7(a friction and wear friction coefficient g not measurable glass-bead-blasted surface grinding process grit grit-blasted surface Ground surface Glass-bead hertz 58 cpm hexagonal crystal structure Hip Replacement human hip joint levigated alumina Lewis Research Center load lubricant metal transfer millimeters MOLYBDENUM AND COBALT-MOLYBDENUM-CHROMIUM molybdenum-chromium alloy NASA TN passivation by preoxidation Performing Organization Photomicrographs and surface pockets to entrap prosthesis provide pockets reduced friction reported in reference run in heptane shoe specimen shown in figure sliding contact sliding surfaces strain gage surface profile traces Surface Treatment Swikert synovial fluid tissue compatibility tracks for cobalt varied surface Vitallium Co-Mo Co-Mo-Cr water-vapor blasting wear and friction wear of cobalt wear of cobalt-molybdenum-chromium wear tracks wear weight loss