Thermal expansion of β-eucryptite in oxide-based ceramic composites
Source abstract
Abstract
This paper presents an experimental investigation on the thermal expansion behaviour of beta-eucryptite (E) when it is used for processing alumina/beta-eucryptite (AE) or zirconia/beta-eucryptite (ZE) composites. Composite materials were prepared from a beta-eucryptite powder synthetised in our laboratory and commercially available alumina or zirconia nanopowders. In order to preserve the beta-eucryptite crystalline phase in sintered materials, the pressureless sintered step was performed at relatively low temperatures (<1300 degrees C). It is experimentally shown that in well-densified oxide-based composites, the beta-eucryptite lost its slightly negative thermal expansion coefficient. This behaviour could be related to compressive residual stresses applied on beta-eucryptite grains due to the thermal expansion mismatch between alumina or zirconia and the beta-eucryptite. (C) 2012 Elsevier Ltd. All rights reserved.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Thermal Expansion and Ionic Conductivity · Nuclear materials and radiation effects
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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