Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 697, Issue -, Pages 71-78Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.04.093
Keywords
Boron carbide; High-temperature strength; Eutectic composite; Tantalum diboride; Spark plasma sintering
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Funding
- Grants-in-Aid for Scientific Research [15H04163] Funding Source: KAKEN
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In this study, flexural strength measurements and microstructural studies have been combined to evaluate the effect of elevated temperatures on the fracture behavior of B4C-TaB2 ceramic composites that have a eutectic structure. Mechanical characterization was carried out at 1600 degrees C, 1800 degrees C and 2000 degrees C. The B4C-TaB2 eutectic composites were prepared in situ using a spark plasma sintering technique. The eutectic composites exhibited strengths of 483 +/- 17 MPa and 525 +/- 12 MPa at 1600 degrees C and 1800 degrees C, respectively, which is higher than the strength of 430 +/- 25 MPa measured at room temperature. The flexural strength of the B4C-TaB2 eutectic composites was 511 +/- 16 MPa at 2000 degrees C (i.e. 0.86 of the melting point of the B4C-TaB2 eutectic), indicating plastic behavior. Analyses of the high-temperature flexural strength behavior of this non-oxide eutectic are reported.
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