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GLAZES FOR ZIRCON PORCELAINS *
Author(s) -
Luttrell Carolyn Banks
Publication year - 1949
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.1151-2916.1949.tb18906.x
Subject(s) - glaze , gloss (optics) , zircon , opacity , materials science , crazing , mineralogy , texture (cosmology) , zirconium , cubic zirconia , composite material , metallurgy , geology , polymer , geochemistry , ceramic , coating , optics , physics , image (mathematics) , artificial intelligence , computer science
A bstract An investigation was conducted to develop a white opaque low‐expansion glaze of suitable gloss and texture for commercial application on zircon porcelain. A glaze containing the alkaline‐earth zirconium silicates was selected as the base glaze; batch changes and molecular adjustments were then made. On a molecular basis the KNaO content should be low (less than 0.20 equivalent); the alkaline‐earth oxides should be used to raise the RO group to 1.00. High MgO (from 0.40 to 0.50 equivalent) definitely reduces crazing tendencies; CaO and ZnO complete the RO group. The most desirable Al 2 O 3 and SiO 2 content is 0.3 to 0.4 and 3.0 to 4.0 equivalents, respectively. The Al 2 O 3 ‐SiO 2 ratio considerably affects the finish and texture of the fired glaze. From 0.5 to 0.7 equivalent of ZrO 2 gives satisfactory opacity and improves crazing resistance; B 2 O 3 , although important as a low‐expansion constituent, is limited to 0.2 equivalent. The compositions of glazes applicable to typical zircon porcelain bodies are given.