Effect of Zirconia, Zirconite and Zircon Mullite Additives on the Properties of Alumina Castable

Abstract:

The effect of the zirconia, zirconite, and zircon mullite additives on the properties of alumina-spinel castable has been investigated in present work. Results showed that the density of castables calcined at 110oC with the addition of zirconia and zirconite was higher than that of zircon mullite. With the increasing amount of additives, the densities of castables added with zirconia and zirconite were increased and that added with zircon mullite had not obviously difference. The apparent porosities of castables heated at 1600oC for 1h were about twice of those calcined at 110oC. The bulk densities of castables heated at 1600oC were lower than those calcined at 110oC. All the samples were expanded and the increasing amount of additives led to higher expansion rate. Though the densities of castables heated at 1600oC were lower than those calcined at 110oC, the cold crushing strength were much higher. When the amount of zirconia was less than 4maa%, the addition of zirconia was beneficial to improve the bending strength, and the addition of 4mass% zirconia led to the 18.2% improvemnt at the strength.

• Periodical: Applied Mechanics and Materials (Volume 151)
• Pages: 346-349
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.151.346
• Online since: January 2012
• Authors: Bing Qiang Li, Yao Shu, Wen Bin Dai, Jing Kun Yu
• Keywords: Alumina Castable, Zircon Mullite, Zirconia, Zirconite

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