Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 104, Issue 6, Pages 2860-2867Publisher
WILEY
DOI: 10.1111/jace.17657
Keywords
B4C-TiB2 ceramic; core-rim structure; fracture toughness; sintering additives; Vickers hardness
Categories
Funding
- Guangdong Innovative and Entrepreneurial Research Team Program [2013G061, 2014YT02C049]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials [19ZK0113]
- National Natural Science Foundation of China [51402055, 51602060, U1401247]
- Science and Technology Planning Project of Guangdong Province [2017A050501033]
- Pearl River S and T Nova Program of Guangzhou [201710010142]
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The addition of Mo-Co-WC sintering additive in B4C-TiB2 ceramics enhances densification and results in core-rim structured grains. The interface of the rim between TiB2 and B4C phases shows smooth and sharp features, suggesting a mechanism involving solid solution and dissolution-precipitation between TiB2 and the additive.
B4C-TiB2 ceramics (TiB2 ranging 5 similar to 70 vol%) with Mo-Co-WC as the sintering additive were prepared by spark plasma sintering. In comparison with B4C-TiB2 without additive, the enhanced densification was evident in the sintered specimen with Mo-Co-WC additive. Core-rim structured grain was observed around TiB2 grains. The interface of the rim between TiB2 and B4C phases demonstrated different feature: the inner borderline of the rim exhibited a smooth feature, whereas a sharp curved grain boundary was observed between the rim and the B4C grain. The formation mechanism is discussed: the epitaxial growth of (Ti,Mo,W)B-2 rim around the TiB2 core may occur as a result of the solid solution and dissolution-precipitation between TiB2 phase and the sintering additive. It was revealed that the fracture toughness increased as the content of TiB2 content increased, alongside the decreased hardness. B4C-30 vol% TiB2 specimen demonstrated the optimal combination of mechanical properties, reaching Vickers hardness of 24.3 GPa and fracture toughness of 3.33 MPa.m(1/2).
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