Preparation of silicon nitride powder from silica and ammonia
| Autor: | Andrzej Pawelec, Slawomir Podsiadlo, B. Strojek, Grzegorz Weisbrod |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Materials science
Process Chemistry and Technology Mineralogy Infrared spectroscopy Nitride Surfaces Coatings and Films Electronic Optical and Magnetic Materials Volumetric flow rate law.invention chemistry.chemical_compound Chemical engineering Optical microscope chemistry Silicon nitride law Materials Chemistry Ceramics and Composites Magnesium nitride Crystalline silicon Thermal analysis |
| Zdroj: | Ceramics International. 28:495-501 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/s0272-8842(01)00122-5 |
| Popis: | Silicon nitride powders were obtained in a reaction of SiO 2 powders with NH 3 . The influence of the following parameters on the quality of Si 3 N 4 was determined: silica particle size, temperature and furnace heating programme, sample heating time, ammonia flow rate and application of the selected mineralising agents. The powders of silica were characterised by: optical microscopy, SEM, X-ray phase analysis and thermal analysis. The products of the syntheses were tested by: optical microscopy, SEM, X-ray phase analysis, IR spectroscopy and classic quantitative analysis. The investigations resulted in elaboration of a method of preparation of crystalline silicon nitride powders containing more than 96% Si 3 N 4 . The discussion on the influence of magnesium nitride additive on the Si 3 N 4 synthesis process has also been carried out. |
| Databáze: | OpenAIRE |
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