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Effects of Glass Frit Oxides on Crystallization and Zircon Pigment Dissolution in Whiteware Coatings
Author(s) -
Earl David A.,
Clark David E.
Publication year - 2000
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.1151-2916.2000.tb01531.x
Subject(s) - zircon , crystallization , frit , dissolution , materials science , microstructure , alkali metal , mineralogy , silicate , chemical engineering , metallurgy , geology , geochemistry , chemistry , organic chemistry , engineering
In experimental whiteware coatings comprised of zircon pigment and multi‐oxide silicate glass frits that incorporated ZrO 2 , the quantity, size, and morphology of zircon that precipitated during “fast‐firing” were mainly dependent upon the ZnO, SrO, and Al 2 O 3 :alkali levels. In these frits, little or no zircon pigment dissolution occurred, and zircon crystallization was nearly complete by 1000°C. Microstructures of the coatings were consistent over a range of peak firing temperatures from 1000° to 1100°C. Fritted ZnO in these coatings stimulated zircon crystallization and produced high opacity. Replacing ZnO with SrO in the same frits prevented zircon from precipitating and resulted in transparent coatings. In frits without ZrO 2 , significant zircon pigment dissolution and crystallization of calcium‐based silicates occurred during firing. In these unstable coatings, crystallization and dissolution increased from 1000° to 1100°C and produced a range of microstructures. Raising the Al 2 O 3 :alkali ratio caused frits with ZrO 2 to precipitate more zircon, and frits without ZrO 2 to form less of the calcium‐based silicates and dissolve less pigment.