Journal
CERAMICS INTERNATIONAL
Volume 30, Issue 2, Pages 267-271Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0272-8842(03)00098-1
Keywords
grain boundary; corrosion; Si3N4; structural applications
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Silicon nitride ceramics with Y2O3 and Al2O3 as sintering additives were corroded in 1 N sulphuric acid at 90degreesC. Any classical corrosion rate model cannot describe the overall kinetics of the corrosion process successfully. At longer corrosions times, a kinetic break occurs, after which slow linear corrosion kinetics prevail. The passivation is due to the formation of a defective silica sublayer in the corrosion zone. We show that it is possible to enforce this passivation long before it would occur naturally by a simple hot drying (150degreesC) procedure after a critical time. As consequence the total mass loss decreases by a factor of 2-3. (C) 2003 Elsevier Ltd and Techna S.r.l. All rights reserved.
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