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Sintering Experiments on Sapphire Spheres
Author(s) -
NAVIAS LOUIS
Publication year - 1956
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.1151-2916.1956.tb14179.x
Subject(s) - spheres , sapphire , sintering , materials science , composite material , lens (geology) , capillary action , molybdenum , metallurgy , optics , laser , physics , astronomy
The plastic‐flow theory of sintering between particles has been suggested and verified by several investigators. Tiny spheres in contact should develop a lens or bridge between them due to capillary action. Such contact lenses have been observed by others in materials such as NaCl, Cu, and stabilized ZrO 2 . They were unable to find contact lenses in pure ZrO 2 or Al 2 O 3 . A simple technique has been developed whereby a contact lens or bridge is obtained between 40‐mil spheres of sapphire by heating them on a thin molybdenum saucer held on a molybdenum block by induction in a vacuum (or in hydrogen).