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CLAY SEWER PIPE MANUFACTURE
Author(s) -
Schurecht H. G.
Publication year - 1923
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.1151-2916.1923.tb19929.x
Subject(s) - glaze , calcination , materials science , mineralogy , iron oxide , salt (chemistry) , metallurgy , oxide , chemistry , ceramic , biochemistry , catalysis
. —A study was made of the relations between the alumina, silica and iron oxide contents in clays and their ability to take a salt glaze. Color. —Under the conditions of these tests it was found that low silica clays containing 0 to 1.00% iron oxide and high silica clays containing 0–2.19% iron oxide in terms of calcined weight produced white to tan glazes; low silica clays containing 1.00 to 3.50% and high silica clays containing 2.19 to 3.5% produced light brown glazes; those having 3.5 to 4.75% produced brown glazes; clays containing 4.75 to 8.2% produced mahogany glazes; and those having more than 8.2% possessed dark brown to black glazes. Brightness. —With clays similar to those tested in this work and which are fired and glazed to the same temperature, the brightness of a salt glaze which will be produced on it, may be predicted by calculating G in the following expression:x 1 , x 2 and x 3 represent the percentages of alumina, silica and iron oxide in the clay in terms of calcined weight. If G is greater than zero the salt glaze will be bright; when between —0.1337 and 0, it will be semi matt; and when less than —0.1337 it will be matt. Thickness of Glaze. —‐The thickness of the salt glaze may be increased 600 per cent by increasing the silica content in a pure clay.