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Absorption of gas in dental gold alloys during melting
Author(s) -
ENGSTRÖM G.,
FREDRIKSSON H.,
WICTORIN L.
Publication year - 1982
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1982.tb00532.x
Subject(s) - hydrogen , solubility , materials science , crucible (geodemography) , alloy , metallurgy , nitrogen , nitrogen gas , oxygen , precipitation , gold alloys , analytical chemistry (journal) , chemistry , environmental chemistry , computational chemistry , physics , organic chemistry , meteorology
Summary The absorption of gas during heating and melting of pure gold and of two dental gold alloys was studied by gas chromatography. The metals were melted by two methods, i.e. gas‐torch and electric heating. The specimens were analysed regarding the content of hydrogen, oxygen and nitrogen. The amount of nitrogen was not measurable in all specimens. Oxygen gas occurred with rather high values in the two dental gold alloys. The hydrogen content was often larger than the solubility limit. It is proposed that hydrogen often gives pore precipitation. It is also proposed that special caution must be taken during melting to reduce the hydrogen content in the melt before casting. D‐alloy (palladium) demonstrated high H and O values on gas‐torch heating.