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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Azevedo, Nuno Monteiro |
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Naim Katea, Sarmad
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Publications (3/3 displayed)
- 2023WC-Ni cemented carbides prepared from Ni nano-dot coated powderscitations
- 2021Synthesis of nano-phase ZrC by carbothermal reduction using a ZrO2–carbon nano-compositecitations
- 2021Niobium carbide – nickel-niobium alloy composites from a nickel coated powder : microstructural development during sinteringcitations
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article
Synthesis of nano-phase ZrC by carbothermal reduction using a ZrO2–carbon nano-composite
Abstract
Carbothermal reduction of Zr-sucrose gels powders into nano-phase ZrC, or ZrC-Zr(C,O) core-shell powders, via a composite of 2–4 nm sized ZrO2 and amorphous carbon, is described. Samples with 1.7–20 sucrose-carbon:Zr ratio gels heated to 1495 °C at 10 °Cmin−1, with 3 and 30 min hold time were studied in detail using; TG, XRD, SEM, TEM, STEM-EDX, and XPS with Ar+-ion etching. After 1495 °C, 3 min, the samples with 12-20C:Zr ratios yielded weakly agglomerated 30 to 40 nm sized ZrC particles, surrounded by a dense 5 nm thick shell of Zr(C,O). With 5C:Zr significant amounts of ZrO2 was present after heating at 1495 °C for 3 min, while after 30 min annealing, ZrC particles without residual amorphous carbon was obtained. Minor amounts of zirconia was found in most samples, which in similarity with the 5 nm Zr(C,O) shell, is believed to stem from post synthesis oxidation.