Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 36, Issue 10, Pages 2419-2426Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.03.028
Keywords
Boron carbide; Ti-Al intermetallics; Spark plasma sintering; Transient liquid phase; Mechanical properties
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Funding
- National Natural Science Foundation of China [51521001]
- Ministry of Science and Technology of China [2015DFR50650]
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Fully-dense B4C-based ceramics were fabricated using Ti-Al intermetallics as sintering aid by Spark Plasma Sintering at a low temperature of 1700 degrees C whilst applying 32 MPa uniaxial pressure. The influence of the intermetallic additions on the phase composition, morphology and mechanical properties of the ceramics were investigated. The intermetallics flowed and react with B4C to form a three-phase composite containing B4C, TiB2 and Al4C3 during the transient liquid phase sintering process. The TiB2 and Al4C3 particles were located on the boundaries between B4C grains and effectively inhibited the growth of B4C, which improved the mechanical properties. Good bonding between B4C and the phases formed was confirmed by TEM analysis. The specimens with 5 wt.% Ti-Al provide an attractive combination of homogeneous morphology and excellent mechanical properties, including a Vickers hardness of 33.5 +/- 0.4 GPa, a flexural strength of 506 +/- 16 MPa and a fracture toughness of 5.5 +/- 0.1 MPa m(0.5). (C) 2016 Elsevier Ltd. All rights reserved.
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