The influence of magnesium oxide addition on the content of combustion products of aluminum nanopowder in air
Currently, the development of new methods for nitrides of alkali and alkaline earth elements is an important issue. It is related to the use of nitrides of these elements in different areas of industry. The aim of the investigation is to determine the regularities of phase formation of air combustio...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2019-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya-tpu.ru/archive/article/view/1589 |
| Summary: | Currently, the development of new methods for nitrides of alkali and alkaline earth elements is an important issue. It is related to the use of nitrides of these elements in different areas of industry. The aim of the investigation is to determine the regularities of phase formation of air combustion products of aluminum nanopowder with additions of magnesium oxide mixtures. The methods of the investigation. To perform the qualitative and quantitative phase analysis the X-ray diffraction (diffractometer DRON-3,0) was used; for calculating chemical activity parameters of mixtures and determining their ignition ability the differential thermal analysis (termoanalyzer SDT Q600 of Scientific Analytical Center of TPU) was used; to determine the microstructure of the initial materials and products of synthesis the electron microscopic analysis (electron microscopes Jeol-840 and Hitachi SU8000) was used. The results of the investigation. The study of chemical activity parameters of the mixtures showed that the mixtures are not pyrophoric in air and do not require extra precautions. The X-ray diffraction data showed that intensity of 100 % reflex of aluminum nitride increased from 75 % for aluminum nanopowder combustion products in air up to 100 % for products of combustion in air of aluminum nanopowder with the addition 12,5 wt. % of magnesium oxide. After increasing the additive of magnesium oxide in the initial mixture up to 25 wt. % the aluminium nitride content in the combustion products went down, but the reflexes of magnesium-aluminate spinel MgAl2O4 and unreacted MgO were intensified. Further increase of MgO in the mixture to 50 wt. % led to a significant reduction of 100 % reflection of aluminum nitride and enhanced the content of spinel MgAl2O4 and unburned MgO. The combustion products of aluminum nanopowder with 75 wt. % of magnesium oxide mixture were mainly represented by the phases of unburned MgO and spinel MgAl2O4, while the reflections of the other phases had the intensity less than 20 %. |
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| ISSN: | 2500-1019 2413-1830 |