A Novel method of synthesis of high purity nano plated boron carbide powder by a solid-state reaction of poly (vinyl alcohol) and boric acid
| Autor: | Nazar Shawgi, Sanxi Li, Song Wang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Vinyl alcohol
Materials science chemistry.chemical_element 02 engineering and technology Boron carbide 01 natural sciences Boric acid chemistry.chemical_compound 0103 physical sciences Materials Chemistry Organic chemistry Ceramic Fourier transform infrared spectroscopy Boron 010302 applied physics chemistry.chemical_classification Process Chemistry and Technology Polymer 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry visual_art Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology Pyrolysis Nuclear chemistry |
| Zdroj: | Ceramics International. 43:10554-10558 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2017.05.120 |
| Popis: | Nano plated and high-purity boron carbide (B 4 C) powder was synthesized via a novel method, based on a solid-state reaction of poly (vinyl alcohol) PVA and boric acid at (200–250) °C in air. The cross-linking between PVA and boric acid was proven by FTIR analysis. The obtained product, a new-type of poly vinyl borate (PVBO), was consecutively pyrolyzed at (700–800) °C for 120 min in air (S 1 ); or was ground and heat treated at 250 °C for 120 min, followed by pyrolysis at (700–800) °C for 120 min in air (S 2 ). Both pyrolyzed specimens (S 1 & S 2 ) were then heat treated at (1375–1475) °C in an Ar flow for (180-120) min, respectively. XRD analysis shows that high purity B 4 C was obtained from S 2 which was pyrolyzed at 750 °C and heat treated at 1475 °C. Compared to previous methods (commercial or sol-gel etc.), this approach is cost-effective, highly promising, and established a new reaction route in the field of polymer- derived ceramic (PDC). |
| Databáze: | OpenAIRE |
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