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Thermal Expansion in Air of Ceramic Oxides to 2200°C
Author(s) -
NIELSEN T. H.,
LEIPOLD M. H.
Publication year - 1963
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.1151-2916.1963.tb11756.x
Subject(s) - materials science , magnesium , spinel , thermal expansion , ceramic , oxide , crystallite , grain size , metallurgy , aluminium , hot isostatic pressing , argon , mineralogy , composite material , sintering , chemistry , organic chemistry
Thermal‐expansion measurements were made in an air atmosphere to 2200°C on polycrystalline single‐phase ceramic oxides. Specimens were fabricated by hot‐pressing, slip casting, and isostatic pressing. Magnesium oxide was tested in both air and argon; calcium oxide as well as magnesium aluminate and aluminum oxide specimens were tested in air. Specimens were characterized as to purity, thermal history, apparent density, grain size, and lattice parameter. It was determined that the coefficient of thermal expansion was not affected by changes in grain size or by fabrication techniques. All of the specimens tested in an air atmosphere showed weight and lattice parameter stability, whereas the magnesium oxide tested in argon did not. When tested in an air atmosphere, magnesium oxide, aluminum oxide, and magnesium aluminate spinel showed a permanent expansion with a decrease in density at temperatures well below their melting points.