In situ formation of ZrB2-ZrO2 ultra-high-temperature ceramic composites from high-energy ball-milled ZrB2 powders
2012 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 518, 38-43 p.Article in journal (Refereed) Published
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.
ZrB2, Ultra-high-temperature ceramics, Spark-plasma sintering
IdentifiersURN: urn:nbn:se:su:diva-76130DOI: 10.1016/j.jallcom.2011.12.102ISI: 000300186500008OAI: oai:DiVA.org:su-76130DiVA: diva2:526136