Phase formation in Al2O3-C refractories with Al addition. Issue 4 (April 2017)

• Record Type: Journal Article
• Authors: Atzenhofer, C.; Gschiel, S.; Harmuth, H.
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 4(2017)
• Page Start: 1805
• Page End: 1810
• Publication Date: 2017-04
• Subjects: Al2O3-C refractories -- Non-oxides -- Phase formation; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.11.027
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Depending on the recipe and the firing conditions, several non-oxides can be formed in Al2 O3 -C refractories. In this paper, the effect of the purity of the recipe components on the phase formation in Al2 O3 -C refractories with Al addition was investigated. Two test series were sintered from 800 °C to 1600 °C under air embedded in coke breeze. One test series was with brown fused alumina, and the other was with tabular alumina. At temperatures of up to 1200 °C the phase formation was the same for both recipes. For temperatures greater than 1400 °C, the impurities of brown fused alumina enhanced the formation of a polytype, while Al4 O4 C and Al28 O21 C6 N6 were formed in the other series. The findings explain the occurrence of several non-oxides in disequilibrium at the chosen temperatures. The occurrence of Al4 C3 was of particular interest due to its low hydration resistance. It was formed at 1200 °C.