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Effect of the Sintering Additive on Microstructure and Mechanical Properties of Hi-Nicalon (TM) SiC Fibers in a HfB2 Matrix
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2013 (English)In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 96, no 2, 643-650 p.Article in journal (Refereed) Published
Abstract [en]

This study is focused on the effect of the sintering additive on the microstructure and properties of HfB2 composites reinforced with SiC HiNicalon fibers. The materials were spark plasma sintered with addition of 510vol% of Si3N4 or ZrSi2. The fibers morphology was examined using scanning and transmission electron microscopy and remarkable differences were observed depending on the additive. Local hardness and Young's modulus were measured by nanoindentation to investigate the fiber mechanical behavior. The introduction of 20vol% SiC short fibers into the HfB2 matrix increased the fracture toughness up to 5.4MPam1/2 for the material sintered with ZrSi2. The room temperature flexural strength of the materials containing fibers slightly decreased when ZrSi2 was used, but with the addition of Si3N4 an improvement of more than the 40%, as compared to the unreinforced material was observed.

Place, publisher, year, edition, pages
2013. Vol. 96, no 2, 643-650 p.
National Category
Materials Chemistry
URN: urn:nbn:se:su:diva-88681DOI: 10.1111/jace.12018ISI: 000314922200051OAI: diva2:613009


Available from: 2013-03-26 Created: 2013-03-25 Last updated: 2013-03-26Bibliographically approved

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Nygren, Mats
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Department of Materials and Environmental Chemistry (MMK)
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