Towards a large-scale production of boron carbide nano particles from poly (vinyl alcohol) and boric acid by a solid-state reaction-pyrolysis process (SRPP)
| Autor: | Li Yang, Nazar Shawgi, Song Wang, Rania Ramzi, Sanxi Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Vinyl alcohol Materials science Process Chemistry and Technology Solid-state Nanoparticle 02 engineering and technology Boron carbide 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Boric acid chemistry.chemical_compound Chemical engineering chemistry Scientific method 0103 physical sciences Materials Chemistry Ceramics and Composites Heat treated Organic chemistry 0210 nano-technology Pyrolysis |
| Zdroj: | Ceramics International. 44:774-778 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2017.09.246 |
| Popis: | The aim of the present work is to develop a solid-state reaction-pyrolysis process (SRPP) of poly (vinyl alcohol) PVA and boric acid for the synthesis of boron carbide. PVA and boric acid in a molar ratio of (4:1) were dry-mixed, solid-state reacted by heating at (200–250) °C in air, and were directly pyrolyzed at (700–800) °C in air to obtain preceramic precursors. By varying the holding time at 250 °C from 210 to 270 min, its effects on the purity of the final product were investigated. The preceramic precursors were ground and heat treated at 1475 °C for 120 min in a flow of Ar. The XRD & FE-SEM analyses show that a high purity boron carbide powder with nanosized particles was obtained using this promising approach. |
| Databáze: | OpenAIRE |
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