Wetting in an electronic packaging ceramic system: II, Wetting of alumina by a silicate glass melt under controlled pO sub 2 conditions

The wetting of polycrystalline Al sub 2 O sub 3 by a colored CaO-MgO aluminosilicate glass was dependent on temp. at 1300-1500 degrees C, but independent of gas atm effects. Neither pO sub 2 (10 sup / -6 / -10 sup / -10 / Pa), the gas buffer system (CO/CO sub 2 or H sub 2 /H sub 2 O), nor preequilib...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1995-01, Vol.78 (11), p.2923-2928
Main Authors: Weirauch, Douglas A, Lazaroff, Jerold E, Ownby, P
Format: Article
Language:English
Online Access:Get full text
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Summary:The wetting of polycrystalline Al sub 2 O sub 3 by a colored CaO-MgO aluminosilicate glass was dependent on temp. at 1300-1500 degrees C, but independent of gas atm effects. Neither pO sub 2 (10 sup / -6 / -10 sup / -10 / Pa), the gas buffer system (CO/CO sub 2 or H sub 2 /H sub 2 O), nor preequilibration of the substrate surface with the atm at the experimental temp. before solid-liquid interface formation affected the stable contact angle. An initial drop in contact angle occurring within the first hour was attributed to rapid dissolution of Al sub 2 O sub 3 and the formation of a stable glass/Al sub 2 O sub 3 interface. The contact angle after an 8-h isothermal hold decreased linearly from 29 degrees to 14 degrees as temp. was increased from 1300 degrees to 1500 degrees . The solid-liquid interfacial energy controlled the wetting behavior. 53 refs.
ISSN:0002-7820