Metallurgical evaluation of a copper-based alloy for dental castings.
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Data
1991-08-01
Autores
Guastaldi, A. C.
Lacefield, W. R.
Leinfelder, K. F.
Mondelli, J.
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Resumo
The present study was designed to evaluate the metallurgical properties of an experimental, low-cost copper-zinc-aluminum-nickel alloy for dental castings. Some specimens were subjected to heat treatment after induction casting. The extent of corrosion was determined by measuring weight loss of specimens stored in a sodium sulfite solution. In the as-cast specimens, tests demonstrated the presence of three phases: the first consisted of copper-zinc-aluminum, the second was similar but lower in copper and aluminum, and the third consisted of an intermetallic compound of manganese-nickel-phosphorus. After heat treatment, the first phase remained relatively constant, the second was converted to Cu3Al, and the third increased in volume. The weight loss from the as-cast specimens was eight times that of the heat-treated specimens. It was concluded that the heat treatment substantially changed the microstructure and improved the corrosion resistance of the experimental alloy.
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Palavras-chave
copper, dental alloy, chemistry, corrosion, denture, heat, materials testing, metallurgy, Copper, Corrosion, Dental Alloys, Dental Casting Technique, Heat, Materials Testing, Metallurgy, Support, Non-U.S. Gov't
Como citar
Quintessence international, v. 22, n. 8, p. 647-652, 1991.