کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1616363 | 1516375 | 2012 | 6 صفحه PDF | دانلود رایگان |

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.
► The in situ formation of fine-grained ZrB2–ZrO2 composites is reported.
► A route to process ZrB2–ZrO2 composites with new microstructures is presented.
► A method to process engineered ZrB2–oxide composites controllably is described.
Journal: Journal of Alloys and Compounds - Volume 518, 25 March 2012, Pages 38–43