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PHYSICAL CHANGES OCCURRING DURING RE‐PRESSING OF FIRE‐CLAY REFRACTORIES *
Author(s) -
Everhart J. O.
Publication year - 1947
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.1151-2916.1947.tb18864.x
Subject(s) - pressing , materials science , grain size , sizing , moisture , bulk density , hot pressing , metallurgy , composite material , mineralogy , geology , chemistry , soil science , soil water , organic chemistry
A bstract In producing fire‐clay refractories, maximum density is obtained by grain sizing, deairing, high‐forming pressures, and high firing temperatures. In re‐pressing stiff‐mud ware, much of the density is lost when there is any appreciable difference in size between the cut blanks and the re‐pressed piece. Data in this paper show that re‐pressed ware is always less dense than unpressed pieces even under the best conditions. Grain size, moisture contents, degree of vacuum, and other factors having to do with forming procedure have little effect on the loss of density. High re‐pressing pressures will reduce the extent of change, but it may be reduced to a minimum only by cutting the blanks to as near the pressed size as possible.