Oxide adherence to a Ni-Cr-Mo ternary alloy

J. R. Mackert, E. E. Parry, C. W. Fairhurst

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The success of a porcelain-fused-to-metal (PFM) restoration depends upon the quality of the porcelain-metal bond. Oxide adherence to commercial PFM alloys has been previously shown to vary widely and to correspond to porcelain-bonding behavior. Most non-precious PFM alloys are based upon a Ni-Cr-Mo ternary alloy and contain small amounts of other elements. The purpose of the present study was to evaluate the oxide adherence of a 76Ni-19Cr-5Mo ternary alloy similar to dental PFM alloys, yet without the additional elements found in these alloys. The outer oxide (NiO) on both polished and cold-worked specimens was found to delaminate at a stress of about 1 MPa. The darkened underlayer thus revealed was found to be enriched in Cr and Mo and appeared to be an internal oxide layer. The oxide adherence to this unmodified Ni-Cr-Mo ternary was substantially lower than any of the commercial alloys tested previously. Cold work was not found to improve the oxide adherence. These results indicate that the alloying elements present in commercial Ni-Cr-Mo alloys exert a pronounced influence on their oxide adherence. Measurement of the effects of various alloying additions on oxide adherence is planned for future work.

Original languageEnglish (US)
Pages (from-to)111-114
Number of pages4
JournalDental Materials
Volume1
Issue number3
DOIs
StatePublished - Jan 1 1985

Keywords

  • adhesiveness
  • dental alloys
  • metallurgy
  • molybdenum
  • nickel-chromium alloys
  • oxides
  • surface properties

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)
  • Dentistry(all)

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