Mechanical properties of cobalt-chromium alloys containing different proportion of once-used alloys after recasts

doi:10.3969/j.issn.2095-4344.2013.42.009

Abstract

Abstract:

BACKGROUND: There are numerous studies about mechanical changes of recast cobalt-chromium ceramic alloys. However, little is reported on the mechanical properties of cobalt-chromium ceramic alloys containing once-used alloys after recasts.
OBJECTIVE: To study the effects of different proportion of once-used alloys to recasting cobalt-chromium alloys on their mechanical properties, including tensile strength, yield strength, elongation and hardness.
METHODS: Cobalt-chromium alloys cast samples were prepared and recast for three times (40% once-used alloys were added per time). The tensile strength, 0.2% yield strength, percentage of elongation, flexural strength and Vickers hardness of each specimen were measured. In addition, microscopic metallographic observation was done.
RESULTS AND CONCLUSION: Being recast for three times, cobalt-chromiun alloys showed no significant differences on their tensile strength, 0.2% yield strength, percentage of elongation, flexural strength and Vickers hardness. GenerationⅠalloy samples had uniform size, small diameter and small carbide size distributing along the grain boundary, mainly exhibiting spherical and irregular wormlike forms. Generations Ⅱ and Ⅲ samples were uniform in shape, but crystal grains were coarsened a little. Carbide from Generation IV samples began to be coarsened, irregular wormlike carbides were increased in amount, and a few of non-metallic inclusions could be found in grains. Cobalt-chromium alloys can be recast after addition of 40% once-used alloys for three times at least in air environment, without decrease of the mechanical properties.

Key words: biocompatible materials, metal ceramic alloys, tensile strength, hardness tests

CLC Number:

R318

Xiao Yue, Ren Dan-dan, Wang Dan . Mechanical properties of cobalt-chromium alloys containing different proportion of once-used alloys after recasts[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(42): 7396-7401.

Figures/Tables 2

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