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Color Stability of Clear and Opaque Titania Enamels Containing Various Color Oxides
Author(s) -
RUSSELL N. K.,
FRIEDBERG A. L.,
PETERSEN F. A.
Publication year - 1951
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.1151-2916.1951.tb13011.x
Subject(s) - hue , opacity , anatase , enamel paint , red color , materials science , colored , mineralogy , rutile , chemistry , optics , composite material , photocatalysis , organic chemistry , physics , catalysis
A study was made of the spectrophotometric characteristics of a clear and an opaque titania‐bearing enamel. Three and six per cent additions of green, blue, brown, and red oxides were made to the base enamels. After firing the enameled samples over a range of time and temperature, spectrcphotometric and X‐ray data were obtained. The results indicate that the lack of stability of the opaque colored enamels is due to the change from a blue‐white to a cream‐white color on increased firing treatment. The addition of a cream component tends to shift the hue of the fired enamel toward the red end of the visible spectrum. The green and the blue colors were much less stable than the red. X‐ray data show that the total anatase present decreases, which is evidence that a cream‐white color developed. X‐ray data did not indicate any change in crystal structure of the anatase, rutile, or color oxide. Titania present in the glass of the clear enamel did not cause color instability.