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Ultra-low temperature reactive spark plasma sintering of ZrB2-hBN ceramics
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Tsinghua University, China.
Number of Authors: 42016 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 36, no 15, p. 3637-3645Article in journal (Refereed) Published
Abstract [en]

Starting from ZrN and amorphous boron, dense ZrB2 ceramics with 37 vol% hexagonal BN were consolidated by spark plasma sintering. Benefiting from the moderate exothermic reaction between ZrN and B and the resultant fine powder generated, ZrB2-BN ceramics with relative density of 94% could be reached at 1100 degrees C, further improved to 97% by 1550 degrees C. The effects of sintering temperature and holding time on the densification behavior, microstructural evolution and mechanical properties of ZrB2-BN ceramics were investigated. ZrB2-37 vol%BN ceramics densified at 1700 degrees C exhibited attractive mechanical performance: a three-point bending strength of 353 MPa, a Vicker's hardness of 6.7 GPa and a Young's modulus of 197.5 GPa. Note that its strength dropped sharply to 191 MPa measured at 1300 degrees C. The combination of low sintering temperature (1100-1550 degrees C), low Young's modulus (180-200 GPa) and relatively high strength (200-350 MPa) make reactively sintered ZrB2-BN composites as promising matrix for continuous fiber reinforced composites.

Place, publisher, year, edition, pages
2016. Vol. 36, no 15, p. 3637-3645
Keywords [en]
Reactive sintering, Spark plasma sintering, Ultra-High Temperature Ceramics, Mechanical property, Hexagonal boron nitride
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-134205DOI: 10.1016/j.jeurceramsoc.2016.01.044ISI: 000381951200011OAI: oai:DiVA.org:su-134205DiVA, id: diva2:1040217
Available from: 2016-10-26 Created: 2016-10-03 Last updated: 2017-11-29Bibliographically approved

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