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In situ formation of ZrB2-ZrO2 ultra-high-temperature ceramic composites from high-energy ball-milled ZrB2 powders
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
2012 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 518, 38-43 p.Article in journal (Refereed) Published
Abstract [en]

The in situ formation is reported of a fine-grained ZrB2 ultra-high-temperature ceramic (UHTC) containing evenly distributed ZrO2 of uniform size located at triple joints and grain boundaries of the ZrB2 grains, discovered during the spark-plasma sintering of ZrB2 powders subjected to high-energy ball-milling in air. It is found that this type of microstructure forms because the oxide film of ZrO2, developed on the surface of the ZrB2 particles during the high-energy ball-milling in air, creeps towards the ZrB2 multigrain joints under the application of pressure during sintering, and then crystallizes there during the fast cooling down to room-temperature. Together with the mechanism by which these dense ZrB2-ZrO2 UHTC composites form, it is also shown that they are simultaneously harder and much tougher than their ZrB2 monolith counterpart.

Place, publisher, year, edition, pages
2012. Vol. 518, 38-43 p.
Keyword [en]
ZrB2, Ultra-high-temperature ceramics, Spark-plasma sintering
National Category
Materials Chemistry
URN: urn:nbn:se:su:diva-76130DOI: 10.1016/j.jallcom.2011.12.102ISI: 000300186500008OAI: diva2:526136
4Available from: 2012-05-10 Created: 2012-05-09 Last updated: 2012-05-10Bibliographically approved

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Nygren, Mats
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ReferencesLink to record
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