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SOME DATA ON THE COMPOSITION OF ARSENIC ENAMELS FOR COPPER 1
Author(s) -
Sweely B. T.
Publication year - 1921
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1921.tb18665.x
Subject(s) - enamel paint , copper , gloss (optics) , arsenic , metallurgy , mineralogy , tooth enamel , chemical composition , chemistry , materials science , composition (language) , nuclear chemistry , composite material , organic chemistry , coating , linguistics , philosophy
Methods of application are by usual wet slushing, and sieving powdered enamel on to clean copper sheets and fusing to a smooth coat. Where slush‐coat is necessary it is advisable to use an enamel free from lead and arsenic as a ground. In this work the dry method is used exclusively. In the formulae given, increase of SiO 2 , increases fracturing or shivering, increase of B 2 O 3 above 0.2 equiv. in presence of 0.1 equiv. AS 2 O 3 causes enamels to come mat. Increasing KNaO at expense of PbO decreases opacity, improves fit and gloss, but makes enamel more soluble. The following limits in composition are recommended: 0.3 to 0.7 KNaO, 1.3 to 1.8 SiO 2 , 0.7 to 3 PbO, 0.0 to 0.2 B 2 O 3 , 0.05 to 0.15 AS 2 O 3 .