| Autor: |
Pawelec, Andrzej A., Strojek, Beata B., Weisbrod, Grzegorz G., Podsiad, Sl&z.xl;awomir S. |
| Zdroj: |
Ceramics International; 2002, Vol. 28 Issue: 5 p495-501, 7p |
| Abstrakt: |
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: |
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| Externí odkaz: |
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