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Spheroidization of Tubular Voids in Al 2 O 3 Crystals at High Temperatures
Author(s) -
YEN C. F.,
COBLE R. L.
Publication year - 1972
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.1151-2916.1972.tb13417.x
Subject(s) - materials science , annealing (glass) , breakup , sapphire , faceting , composite material , crystallography , mechanics , optics , chemistry , laser , physics
Cracks introduced into single‐crystal sapphire broke up after annealing, first into channels of cylindrical voids and ultimately into rows of spherical pores, with the thicker gap spacings in the original crack remaining open. Breakup of the cylindrical voids on subsequent annealing conformed to the models for surface‐diffusion‐controlled material transport. At the temperatures of measurement, the magnitudes of the calculated surface diffusivities agree well with values reported previously.