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Ill, NOTES ON CASTING ALL‐KAOLIN BODIES
Author(s) -
Hedquist A. J.,
Wilson E.,
Gould R. E.
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.tb19456.x
Subject(s) - casting , sodium silicate , materials science , metallurgy , sodium carbonate , slip (aerodynamics) , composite material , mineralogy , sodium , chemistry , engineering , aerospace engineering
A bstract The bodies recorded in Part II were tested to see whether casting could be done quickly and easily and kept under close control. Two deflocculants were used which previously had been found best for bodies made from all‐American kaolin, viz. , sodium gallate and the commercially prepared No. 2 clay deflocculant. Both dispersing agents were successful, with the No. 2 clay deflocculant slightly better. One hundred and twenty‐five 1 / 4 ‐ton batches were processed. It was possible to control the casting properties within extremely close limits if the viscosity, specific gravity, and temperature were held at specified values thought to be easily attainable. It was important to have the clay properly prepared before making it into casting slip, and it was especially necessary to have it pugged from the filter press, aged 2 or 3 days, and repugged under vacuum. The casting appeared to be much better than that of the average semivitreous or hotel china bodies commonly found in production. With these dispersing agents, the mold life was much longer than with sodium carbonate and sodium silicate.