EFFECT OF ALUMINUM POWDER ON THE SYNTHESIS OF CORUNDUM-MULLITE COMPOSITES
Corundum-mullite composites were prepared by reaction sintering from tabular corundum, activated mullite powder, metal aluminum powder and SiO2 micro powder. The effect of aluminum powder content on the synthesis and densification of the corundum-mullite was studied. All raw materials were mixed and...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Chemistry and Technology, Prague
2013-06-01
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| Series: | Ceramics-Silikáty |
| Online Access: | http://www.ceramics-silikaty.cz/2013/pdf/2013_02_133.pdf |
| Summary: | Corundum-mullite composites were prepared by reaction sintering from tabular corundum, activated mullite powder, metal aluminum powder and SiO2 micro powder. The effect of aluminum powder content on the synthesis and densification of the corundum-mullite was studied. All raw materials were mixed and pressed into billets with diameters of 20 mm and height of 15 mm. The green-body billets were sintered at temperature from 1100°C to 1500°C in an air atmosphere. Bulk density, apparent porosity, phase composition and microstructure of final sintered products were analyzed. The results indicated that aluminum powder can promote the densification and mullitization of corundum-mullite composites. At the same time, aluminum powder promoted the formation of columnar mullite. Among materials sintered at 1500°C for 3 h, samples with 8 % aluminum powder had the highest bulk density. |
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| ISSN: | 0862-5468 1804-5847 |