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Penetration of Polycrystalline Alumina by Glass at High Temperatures
Author(s) -
FLAITZ PHILIP L.,
PASK JOSEPH A.
Publication year - 1987
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.1151-2916.1987.tb05674.x
Subject(s) - penetration (warfare) , materials science , crystallite , wetting , microstructure , grain boundary , sintering , composite material , penetration depth , solid solution , mineralogy , metallurgy , optics , chemistry , physics , operations research , engineering
An analysis of interfacial energies in a solid‐liquid system showed that complete penetration of a liquid along grain boundaries in a microstructure forming during liquid‐phase sintering is not necessarily associated with complete wetting or spreading at the solid‐liquid interface. Investigations were made on the penetration of CaO‐Al 2 O 3 ‐SiO 2 glasses into dense polycrystalline aluminas. Initial penetration was along three‐grain junctions or grain boundaries by a solution/reaction between the liquid and defect‐containing alumina along interfaces. Degree of penetration was variable, and it was dependent on internal strain and MgO addition. Extended heat treatments reduced liquid penetration.