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EFFECT OF MILL ADDITIONS ON THE THERMAL EXPANSION OF SHEET‐IRON GROUND‐COAT ENAMELS *
Author(s) -
Fellows R. L.,
Howe E. E.
Publication year - 1936
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.1151-2916.1936.tb19805.x
Subject(s) - frit , thermal expansion , materials science , mill , composite material , feldspar , metallurgy , mineralogy , chemistry , quartz
A bstract Since the effect on thermal expansion of clay, feldspar, and silica, when introduced as mill additions to a sheet‐iron ground‐coat enamel, has not hitherto been clearly shown, thermal‐expansion studies were made on a two‐frit ground‐coat enamel for sheet iron, varying the amounts of clay, feldspar, and silica within reasonable limits of mill additions. It is common practice to use a combination of a hard and a soft frit ground coat to give greater flexibility in firing and operation, but it is not known whether the two frits form a single glass upon firing to give an expansion dependent upon the relative amounts of each frit present. Thermal‐expansion tests, therefore, were also made on enamels containing varying proportions of high‐ and low‐expansion frits. Results were obtained by the use of the interferometer, and the rod method of making specimens as used by Andrews and Smith 1 was compared to the plate method described in this paper. Through the use of these two methods of preparing the samples, a comparison of the relative solubility of the mill additions in the ground‐coat frit was secured.