Journal
SCRIPTA MATERIALIA
Volume 164, Issue -, Pages 12-16Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.01.024
Keywords
Tantalum carbide; High-entropy ceramics; Flexural strength; High temperature materials
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Funding
- World Premier International Research Center Initiative (WPI), MEXT, Japan
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The solid solution formation and consolidation of the (Ta,Zr,Nb)C single-phase ceramic made from commercial TaC, ZrC and NbC powders prepared by spark plasma sintering at the temperature of 1920 degrees C was investigated. Phase analysis and lattice parameter measurements by X-ray diffraction showed multi-stage formation of the single-phase high-entropy-type carbide with the lattice parameter of 4.535 angstrom. The flexural strength and fracture toughness at room temperature were 460 +/- 24 MPa and 2.9 MPa m(1/2), respectively. With an increase in temperature, the flexural strength showed an increase up to 1600 degrees C to 496 +/- 44 MPa, then decreased after 1800 degrees C to 366 +/- 46 MPa. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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