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Formation of Oxide Films on ZrB 2 –15 vol% SiC Composites During Oxidation: Evolution with Time and Temperature
Author(s) -
Karlsdottir Sigrun N.,
Halloran John W.
Publication year - 2009
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.1551-2916.2009.03052.x
Subject(s) - oxide , materials science , composite material , cubic zirconia , convection , population , chemical engineering , metallurgy , thermodynamics , ceramic , physics , demography , sociology , engineering
The evolution of convection cells features that form in oxide films on ZrB 2 –SiC composites are quantified by the number population, size, and distribution in oxide films on ZrB 2 –15 vol% SiC oxidized at temperatures between 1500° and 1600°C for various oxidation times. The number of convection cells per unit area increases after short exposure times of the oxidation at 1550°C, but then decreases slowly with increasing time. The results indicate that these convection cells are transient, they form and transport boria–silica–zirconia liquid to the surface but with increasing exposure time the increasing amount of flowing viscous SiO 2 ‐rich liquid submerges them and they become extinct.