Ceramics-Silikáty 55, (2) 169 - 175 (2011) |
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THE EFFECT OF DOLOMITE TYPE AND Al₂O₃ CONTENT ON THE PHASE COMPOSITION IN ALUMINOUS CEMENTS CONTAINING SPINEL
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Pouyamehr M. R. 1, Nemati Z. A. 2, Faghihi Sani M. A. 2,
Naghizadeh R. 3
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1 Materials Engineering Department, Science & Research Branch, Islamic Azad University, Tehran, Iran
2 Faculty of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
3 Faculty of Materials Engineering, Iran University of Science & Technology, Tehran, Iran
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Keywords: Aluminous cement, Spinel, Dolomite, CA, C₁₂A₇
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In this paper, the effect of dolomite type and Al₂O₃ content on the phase composition in aluminous cements containing
MA spinel is investigated. For this reason, the raw and calcined dolomites are used as raw materials along with calcined
alumina in the preparation of the cement. Then, different compositions are prepared at 1350 °C using the sintering method
and their mineralogical compositions are investigated using the diffractometric technique. Also, their microstructures arre
evaluated. The results indicate that raw materials used have great effect on the type and amount of formed phases in cement
composition. Independently of the dolomite type used, a mixed phase product consisting of spinel accompanied by CA
and CA₂ is obtained. The content of CA phase in the cement composition is decreased with increasing of Al₂O₃ in the raw
materials composition. On the other hand, the content of CA₂ phase is increased with the addition of Al₂O₃. In addition, the
results show that the formation of C₁₂A₇ is favored by use of calcined dolomite. |
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