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THE INFLUENCE OF DIFFERENT FELDSPARS ON THE “FREEZING” BEHAVIOR OF CONES 1
Author(s) -
Orton Edward,
Krehbiel J. F.
Publication year - 1928
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.1151-2916.1928.tb17019.x
Subject(s) - ceramic , fusion , materials science , lag , mineralogy , thermodynamics , composite material , chemistry , physics , computer science , computer network , philosophy , linguistics
The term “freezing,” in ceramic parlance, means the increased resistance to viscous fusion, which ceramic bodies often show when their heat treatment is interrupted by chilling or the temperature is held static too long and not allowed to progress upward at the usual or proper rate. A body so treated often becomes distinctly more refractory and cannot be softened to viscous fusion without use of a higher temperature than would otherwise have been necessary. In this condition, it is said to be “frozen.” This freezing behavior may occur in the firing of cones as in other ceramic products, and, because of the use to which they are put and their shape which facilitates accurate comparisons, is more serious in its consequences and more easily detected than in other ceramic products. The present study was undertaken ( a ) to get some definite quantitative measurements of just what this lag in fusion amounts to under a given set of conditions, ( b ) to determine whether it is a peculiarity due to some one ingredient or combination of ingredients, or whether it is a generic quality applying to all ceramic mixtures of a given range, and ( c ) to get any new light that could be had as to the ultimate nature or cause of the phenomenon. The amount of the lag has been quantitatively determined for cone 10 as furnished by the Germans and our own factory, and the influence of different feldspars and clays in producing this lag has been experimentally studied. Different feldspars are shown to produce characteristic effects. No important light is thrown upon the ultimate cause of the phenomenon.