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USE OF NEPHELINE SYENITE IN SANITARY PORCELAIN *
Author(s) -
Koenig C. J.
Publication year - 1939
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.1151-2916.1939.tb19425.x
Subject(s) - nepheline syenite , nepheline , vitrification , fineness , materials science , potash , feldspar , mineralogy , metallurgy , geology , potassium , quartz , medicine , andrology
A bstract By introducing nepheline syenite in sanitary porcelain in reduced amounts to replace potash feldspar, a longer vitrification range is afforded which results in less warpage. Ware fluxed with nepheline syenite has a steel‐like ring, the pitch being higher than the regular ware. An electrical machine for producing pure tones was used to classify the various pitches. An oscillograph was used to determine decrement or tone decay. Nepheline syenite, ground to near pottery‐grade fineness, was air‐separated into coarse, medium, and fine divisions. When used in a porcelain body, the fine division afforded a longer vitrification range, lower warpage, and increased mechanical strength. The sound properties of these bodies are classified. Photomicrographs of body structures are included.