Ceramics-Silikáty 57, (2) 133 - 137 (2013) |
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EFFECT OF ALUMINUM POWDER ON THE SYNTHESIS OF CORUNDUM-MULLITE COMPOSITES
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Ruan Guozhi, Zhang Zhihui, Yin Mingqiang,
Xu Guogang
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College of Materials Science and Engineering, Shandong University of Science and Technology,
Qingdao, Shandong, P.R.China, 266590
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Keywords: Aluminum, Corundum-mullite composites, Sintering, Densification
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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 1100oC to 1500oC 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 1500oC for 3 h, samples with
8 % aluminum powder had the highest bulk density. |
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