1. Microstructure and Mechanical Properties of Spark Plasma Sintered TaC0.7 Ceramics.
- Author
-
Liu Limeng, Ye Feng, Zhou Yu, and Zhang Zhiguo
- Subjects
CERAMIC materials ,TANTALUM isotopes ,FUSION reactors ,METAL fractures ,MICROSTRUCTURE ,SINTERING ,SPECTRUM analysis - Abstract
The TaC
0.7 composition was spark plasma sintered (SPS) at 1600°-1900°C using TaC and Ta as the starting powders. Densification process, phase evolution, microstructure development, and the mechanical properties of the composites were investigated. The results indicated that the TaC0.7 composition could be SPS to >95% of theoretical density in 5 min at 1600°C or above. The phase formation was associated with carbon diffusion from the starting particles TaC to Ta to form Ta2 C and Ta6 C5 as intermediate phases, and subsequently the equilibrium phases of TaCy and ζ-Ta4 C3− x . The presence of lamellar ζ-Ta4 C3− x regions enhanced the flexure strength (up to 972 MPa) and fracture toughness (up to 13.8 MPa·m1/2 ). [ABSTRACT FROM AUTHOR]- Published
- 2010
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