Abstract
This study demonstrates that reactive consolidation achieved via spark plasma sintering (SPS) is an effective strategy to enhance the high-temperature flexural strength of TiB2-based ceramics. Monolithic ceramics of TaC and TiB2 were consolidated by non-reactive SPS and were used as reference samples. The microstructural development during room- and high-temperature strength tests was analyzed. The room-temperature strength of TiB2 ceramics was analyzed as a function of the grain size. The high-temperature strength and associated microstructural development of monolithic TaC ceramics are reported for the first time. The TiB2-TaC ceramic system was then consolidated by reactive SPS at 2000 °C. The flexural strength of the 10 wt% TaC-TiB2 ceramic composites reached 533 MPa at room temperature and 480 MPa at 1600 °C. The development of the (Ti,Ta)(C,B) phase was considered the main reason for the preservation of the high strength up to 1600 °C. Both bulk TaC and TiB2 exhibited drastic decreases in their bending strengths at 1600 °C because of the activation of plastic deformation associated with high-temperature creep, and their strength did not exceed 210 MPa.
Original language | English |
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Pages (from-to) | 1298-1306 |
Number of pages | 9 |
Journal | Ceramics International |
Volume | 42 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2016 Jan |
Externally published | Yes |
Keywords
- High-temperature flexural strength
- Reaction sintering
- Spark plasma sintering
- TaC
- TiB
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry