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TESTS ON SOME SAGGER CLAYS AND BODIES 1
Author(s) -
Twells Robert
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.tb17767.x
Subject(s) - grog , shrinkage , specific gravity , cone calorimeter , materials science , composite material , absorption of water , geotechnical engineering , geology , waste management , engineering , char , pyrolysis
Tests on the Sagger Clays.—Bars were made from three typical sagger clays without the addition of grog. After burning at cone 101/2 these bars were tested for linear shrinkage, transverse strength, dry and fired, absorption of moisture , and dye penetration. Tests on Fire Clay‐Grog Sagger Bodies.—Two series of bodies were made up into bars. After being burned at cone 101/2 the bars were tested for linear shrinkage, transverse strength, dry and fired , and resistance to heat changes. The best body of this type tested was No. 5 which had the composition: No. 8 buff clay, 29.870; No. 1 fine clay, 18.2%; grog, 6‐to 20‐mesh, 42.0%; grog, 20‐mesh and finer, 10.0%. As a plant test 100 saggers were made from this body. At the end of five fires, three were broken, and fifteen were slightly cracked. Tests on Some Refractory Bodies not Commonly Used for Saggers–Three bodies were made into bars, fired to cone 101/2 and tested as before. Two proved much superior to those of the fire clay‐grog type. Their compositions are:These bodies, especially No. 14, are of types ordinarily considered too expensive (their first cost) for general use. Are such bodies actually more expensive, when the cost is figured on the basis of the lives of the saggers? They can be determined only by making plant trials of a large number of saggers, determining the relative “cost per fire.”