ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 57, (2) 133 - 137 (2013)

Ruan Guozhi, Zhang Zhihui, Yin Mingqiang, Xu Guogang
College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong, P.R.China, 266590

Keywords: Aluminum, Corundum-mullite composites, Sintering, Densification

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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