ISSN:
1573-4889
Keywords:
chromium oxide
;
oxide adhesion
;
dental alloys
;
beryllium
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The morphology and chemical makeup of oxides formed during degassing heat treatments on the surfaces of Ni-Cr and Co-Cr dental alloys designed for porcelain bonding were examined. A technique was developed for stripping intact oxides from these alloys for SEM examination of the oxide surface originally in contact with the metal. Information on the chemical composition of the films was obtained by energy dispersive X-ray spectroscopy. The poorly adherent oxides were found to be wrinkled, but the metal surfaces beneath these films were wrinkled correspondingly. The loss of oxide-metal contact appeared to be limited to the areas of localized void formation, predominantly in the Cr-rich phases. The undersurfaces of the strongly adherent oxides were found to be covered with minute protrusions of oxide. Large pegs of oxide were found to have extended into the NiBe intermetallic phase of these alloys. Beryllium appears to be the oxygen-active element responsible for peg formation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01072912
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