Effect of In Situ Formed Mullite on Properties of High Alumina ULC Castables

Abstract:

In order to improve the hot strength of pre-cast shapes of high alumina castables used in industrial furnaces, the present work explored the approach to using in-situ formed mullite by incorporating 3%-9% silicon powders in bauxite based ULC castables. The pre-cast specimens were dried and then heated at 1450°C for 3h in air. The in-situ formed mullite derived from Si can remarkably improve HMOR of the castables. Refractoriness under load and TSR can also be improved by Si incorporation. The microstructure of the related castable samples was interpreted. The optimizing addition of Si power in this work is about 5%.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 688-692
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.688
• Online since: December 2011
• Authors: Zhen Yong Bi, Ning Sheng Zhou, Jia Lin Sun, Jing Zhao, Ji Wei Li, De Ting Xu
• Keywords: High Alumina ULC Castables, HMOR, In Situ Reaction, Silicon

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