Synthesis of ZrB2/SiC composite powders by single-step solution process from organic–inorganic hybrid precursor
| Autor: | Niranjan Patra, William E. Lee, Daniel Doni Jayaseelan |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Zirconium diboride
Materials science Composite number 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Ultra-high-temperature ceramics Industrial and Manufacturing Engineering 0104 chemical sciences Tetraethyl orthosilicate Boric acid chemistry.chemical_compound chemistry Chemical engineering Ceramics and Composites Zirconyl chloride engineering Composite material Fourier transform infrared spectroscopy 0210 nano-technology Thermal analysis |
| Zdroj: | Advances in Applied Ceramics. 115:36-42 |
| ISSN: | 1743-6761 1743-6753 |
| DOI: | 10.1179/1743676115y.0000000058 |
| Popis: | A precursor of a zirconium diboride/silicon carbide (ZrB2/SiC) composite was synthesised via an organic–inorganic hybrid derived from gum karaya, tetraethyl orthosilicate, boric acid and zirconyl chloride starting materials. Fourier transform infrared spectroscopy of the as-synthesised dried hybrid revealed the formation of Si–O, Zr–O–C and B–O–B. X-ray diffraction revealed that the powder consists of only ZrB2 and β-SiC. Scanning electron microscopy and TEM of the composite powders showed that SiC and ZrB2 occurred in intimately mixed aggregates of spheroidal submicron sized particles for low (3M) boric acid concentration, while at high (5M) boric acid concentration, the two phases are larger with the ZrB2 adopting a blocky, angular morphology (∼10–30 μm long by 5 μm wide and thick), while the SiC remains spheroidal with ∼1 μm diameter particles in 10–20 μm diameter aggregates. Thermogravimetry–differential thermal analysis with the help of X-ray diffraction analysis revealed that the formation temperatu... |
| Databáze: | OpenAIRE |
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