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Thermography of Gypsum
Author(s) -
WEST RICHARD R.,
SUTTON WILLARD J.
Publication year - 1954
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.1151-2916.1954.tb14027.x
Subject(s) - gypsum , decomposition , thermal decomposition , carbon fibers , nitrogen , carbon monoxide , carbon dioxide , mineralogy , compounds of carbon , methane , mineral , materials science , chemistry , metallurgy , chemical reaction , composite material , organic chemistry , composite number , catalysis
A study of gypsum was made using the differential thermal analysis technique. Gypsum and mixtures of gypsum with silica, alumina, iron oxide, dialyzed kaolin, or carbon were analyzed. Furnace atmospheres of air, nitrogen, carbon dioxide, and carbon monoxide were used. Gases evolved at the decomposition temperature of gypsum were analyzed chemically and sample residues were anelyzed by X‐ray diffraction A slight amount of decomposition was observed when gypsum passed from the beta to alpha mineral form of CaSO 4 , but decomposition was not complete even after fusion had started. The addition of 20% carbon to the gypsum and heating in a nitrogen atmosphere caused decomposition, with evolution of CO 2 to start at a temperature as low as 615°C.