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The System Na 2 O–P 2 O 5 –Al 2 O 3 –B 2 O 3 as a Possible Base for Low‐Temperature Titania‐Opacified Porcelain Enamels
Author(s) -
BLAIR L. R.,
BEALS M. D.
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.tb11617.x
Subject(s) - gloss (optics) , phosphoric acid , opacity , materials science , mineralogy , alkali metal , thermal expansion , titanium dioxide , titanium , chemistry , metallurgy , inorganic chemistry , nuclear chemistry , composite material , optics , organic chemistry , physics , coating
The region of glass formation in the system Na 2 O–P 2 O 5 –Al 2 O 3 –B 2 O 3 has been established at levels of 10, 20, 30, 40, and 50 mole% Na 2 O. The compositions examined were restricted to those which could be melted easily (at temperatures < 1500°C.) and to those which could be compounded without the use of phosphoric anhydride or phosphoric acid as a source of P 2 O 5 . Sufficient titanium dioxide to develop opacity during firing was added to those four‐component glasses which possessed a reasonable degree of acid and water resistance. The resulting enamels were evaluated from a standpoint of firing temperature, acid resistance, color, and gloss. Compositions have been found which can be fired at temperatures in the range 675° to 725°C., have class AA acid resistance, good opacity, and whiteness. Their chief disadvantages axe poor alkali resistance and a high coefficient of thermal expansion.