Fabrication and plasma arc thermal shock resistance of HfB2-based ultra high temperature ceramics |
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Authors: | Ling Weng Wen-bo Han and Chang-qing Hong |
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Affiliation: | [1]School of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China [2]Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | Two hafnium diboride based ceramic matrix composites containing 20% (volume fraction) SiC particle and with or without AlN
as sintering additives were fabricated by hot-pressed sintering. The mechanical properties and microstructures of these two
composites were tested and the thermal shock resistances were evaluated by plasma arc heater. The results indicate that the
composite with AlN as sintering additive has a denser and finer microstructure than composite without sintering additive,
and the mechanical properties, thermal shock resistance of the composite with AlN as sintering additive are also higher than
those of the composite without AlN. Microstructure analysis on the cross-section of two composites after thermal shock tests
indicates that a compact oxidation scale contains HfO2 and Al2O3 liquid phase is found on the surface of composite with AlN, which could fill the voids and cracks of surface and improve
the thermal shock resistance of composite. |
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Keywords: | hafnium diboride thermal shock resistance plasma arc test microstructure |
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