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THE EFFECT OF REPEATED FIRING UPON THE SPECIFIC GRAVITY AND MICROSTRUCTURE OF SOME ALUMINUM‐SILICATE MINERALS *
Author(s) -
Riddle Frank Harwood,
Peck Albert B.
Publication year - 1935
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.1151-2916.1935.tb19378.x
Subject(s) - mullite , silicate , silicate minerals , mineralogy , dissociation (chemistry) , specific gravity , petrography , aluminium , chemistry , high gravity , geology , materials science , metallurgy , ceramic , organic chemistry , food science , fermentation
Repeated firing of several aluminum‐silicate minerals to the same temperatures show that the specific gravities of the fired products do not drop at the same rate. Petrographic‐microscopic examinations show that this is due to different rates of dissociation in the minerals. While these rates of reaction or dissociation can not be measured accurately, some idea of the relative rates can be obtained by comparison of the sizes of completely dissociated grains of the minerals or of the widths of the borders of the dissociation products formed around the grains. Furthermore, the effect of repeated firing upon the increase in size of mullite crystals formed when the minerals dissociate gives evidence concerning the rate of growth or probable refractoriness of the minerals. These are described in some detail and close correlation between them and the specific gravity changes are pointed out.