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A MECHANISM OF BLACK SPECK FORMATION IN ENAMEL RESULTING FROM REBOILING OF THE GROUND COAT *
Author(s) -
Hayes Anson,
Canfield J. J.,
Mcgohan G. W.
Publication year - 1932
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.1151-2916.1932.tb13939.x
Subject(s) - enamel paint , layer (electronics) , coat , base (topology) , composite material , metal , materials science , oxide , mineralogy , metallurgy , geology , mathematical analysis , mathematics
Experimental and microscopic evidence is given to show that rebolling of a ground coat results from a fracture when refiring the ground‐coat enamel. Air fills the cracks and connected bubbles. The cracks are sealed over and there is an expansion of the bubbles downward toward the base metal into the oxide layer. No evidence has been found which indicates that reboiling is caused by evolution of gas from the metal.