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NATURE OF THE GLASS PHASE IN HEATED CLAY MATERIALS: II*
Author(s) -
Shelton George R.,
Meyer William W.
Publication year - 1938
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.1151-2916.1938.tb15737.x
Subject(s) - mullite , microstructure , materials science , phase (matter) , composite material , quartz , mineralogy , chemistry , ceramic , organic chemistry
A bstract The glass phase in the bodies studied was more sensitive to variations in heat treatment than were the physical properties. Increased rates of heating caused less glass and mullite formation, less quartz corrosion, more pores and blebs, and increased heterogeneity of the glassy matrix. Microstructure and physical properties indicated an optimum heating rate between 50° and 90° per hour. Soaking increased the amount of glass, more so after slow than after rapid heating. Soaking after rapid heating did not reduce the number of blebs. Soaking too long and at too high temperatures made blebs more numerous. A minimum soaking time of one hour seemed desirable. The optimum heating rate and minimum soaking time governed the shortest heating schedule productive of the best microstructure and physical properties.