| Autor: |
Chkhartishvili, Levan, Mikeladze, Archil, Jalabadze, Nikoloz, Nadaraia, Lili, Korkia, Tamar, Chedia, Roin |
| Zdroj: |
Diffusion and Defect Data Part B: Solid State Phenomena; April 2022, Vol. 331 Issue: 1 p173-184, 12p |
| Abstrakt: |
The ultra-dispersive powders of pre-ceramic precursors for boron carbide based composites were obtained by relatively low-temperature (at 200 – 1000 °C) synthesis from liquid charges containing available compounds such as salts and oxides. Boron carbide matrix ceramics were compacted by their reactive spark plasma sintering (SPS) at 1500 – 1700 °C. It is noted that the X-ray diffraction (XRD) peaks corresponding (m)ZrO2 and WC phases presented in the synthetic pre-ceramic precursors disappear after the SPS is conducted at 1500 °C. It is established that the addition of tungsten and cobalt compounds promotes both the low-temperature synthesis of ceramic components and sintering processes of their powders. Energy dispersive X-ray (EDX) analysis showed that the ceramics contain a small amount of Co (0.8 – 2 wt.%). The density of samples of cobalt-containing ceramics B4C–ZrB2–W2B5–Co is higher compared to that of cobalt-free ceramics B4C–ZrB2–W2B5. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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