Abstract
Zirconium diboride (ZrB 2)-zirconium dioxide (ZrO 2) ceramic powders were prepared by comparing two different boron sources as boron oxide (B 2O 3) and elemental boron (B). The production method was high-energy ball milling and subsequent annealing of powder blends containing stoichiometric amounts of ZrO 2, B 2O 3/B powders in the presence of graphite as a reductant. The effects of milling duration (0, 2 and 6 h), annealing duration (6 and 12 h) and annealing temperature (1200-1400°C) on the formation and microstructure of ceramic powders were investigated. Phase, thermal and microstructural characterizations of the milled and annealed powders were performed by X-ray diffractometer (XRD), differential scanning calorimeter (DSC) and transmission electron microscope (TEM). The formation of ZrB 2 starts after milling for 2 h and annealing at 1300°C if B 2O 3 is used as boron source and after milling for 2 h and annealing at 1200°C if B is used as boron source.
Original language | English |
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Pages (from-to) | 2201-2207 |
Number of pages | 7 |
Journal | Ceramics International |
Volume | 38 |
Issue number | 3 |
DOIs | |
Publication status | Published - Apr 2012 |
Keywords
- A. Milling
- Annealing
- D. Borides
- D. Carbon
- D. ZrO