Structural Characteristics in Cobalt Based Alloys
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Date
2008Auteur
Ghiban, Brânduşa
Borţun, Cristina
Ciucă, Sorin
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Afficher la notice complèteRésumé
In the present paper there are presented results of investigations on samples of
partially removable denture made of cobalt base alloys (Co-Cr-Mo) regarding
specific structural analysis: determination of structural phases by quantitative and
qualitative microstructural analysis, microhardness determinations versus different
casting parameters [1,2,3,4]. By metallographic analysis some important structural
aspects may be pointed: the presence of lace eutectic and carbides with
discontinuous precipitation in metallic matrix, non-uniform dendritic structure with
interdendritic micro-porosities, interdendritic cracks in a structure with fine lace
eutectic. Different types of welding were tested, which gave both structural
modification and morphology of constituents. Structural modifications which can be
made for repairing of prosthesis may diminish mechanical properties of prosthesis,
microhardness values of two cobalt base alloys welded by laser technology being
high, which may confer a brittle behaviour.
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- 2008 fascicula9 nr2 [22]