Five Ni-Cr alloys were studied in order to identify the compounds formed on the alloy surface during oxidation under conditions similar to those encountered during dental laboratory procedures prior to application of porcelain. After the alloys were oxidized, the films covering the surfaces were removed with the aid of a Brmethanol solution. X-ray diffraction was used to analyze the compounds formed.
Oxides of nearly all elements contained by the alloys were found after low-temperature (650°C) oxidation, while NiO and particularly Cr203 were predominant after oxidation at high temperatures (1000°C).
Get full access to this article
View all access options for this article.
References
1.
Anusavice, K.J.; Horner, J.A.; and Fairhurst, C.W. (1977): Adherence Controlling Elements in Ceramic-Metal Systems. II. Nonprecious Alloys, J Dent Res56:1053-1061.
2.
Baran, G.R. (1983a): Oxidation Kinetics of Some Ni-Cr Alloys, J Dent Res62:51-55.
3.
Baran, G.R. (1983b): Topography and Composition of Oxides on Ni-Cr Alloys, IADR Abst62: No. 349.
4.
Baran, G.R. (1984): Auger Chemical Analysis of Oxides on Ni-Cr Alloys , J Dent Res63:76-80.
5.
Chattopadhyay, B. and Wood, G.C. (1970): The Transient Oxidation of Alloys, Oxid of Metals2:373-399.
6.
Cullity, B.D. (1956): Elements of X-Ray Diffraction. Reading, MA: Addison-Wesley Publishing Company, Inc. , p. 355.
7.
Douglass, D.L. and Armijo, J.S. (1970): The Effect of Silicon and Manganese on the Oxidation Mechanism of Ni-20Cr, Oxid of Metals2:207-231.
8.
Kear, B.H.; Pettit, F.S.; Fornwalt, D.E. and Lemaire, L.P. (1971): On the Transient Oxidation of a Ni-15Cr-6Al Alloy , Oxid of Metals3:557-569.
9.
Levin, E.M. and McMurdie, H.F. (1975): Phase Diagrams for Ceramists. Columbus, OH: American Ceramic Society, p. 27.
10.
Mackert, J.R., Jr. (1979): Porcelain Bonding of a Nickel-Chromium Dental Casting Alloy. Published Ph.D. dissertation, University of Virginia, Charlottesville, VA, p. 124.
11.
Mackert, J.R., Jr.; Ringle, R.D.; and Fairhurst, C.W. (1981): Oxide Wrinkling and Porcelain Adherence on Nonprecious Alloys, IADR Progr & Abst60: No. 377.
12.
Wood, G.C. and Chattopadhyay, B. (1970): Transient Oxidation of Ni-Base Alloys, Corrosion Science10:471-489.
