Interceram - International Ceramic Review

, Volume 67, Supplement 1, pp 44–49 | Cite as

A Study on the Phosphate-Bonded High-Alumina Castable — Effect of MgO Addition

  • R. SarkarEmail author
  • U.K. Behera
Research and Development Alumina Castables


Mono-aluminium phosphate [MAP, Al(H2PO4)3] is a widely used chemical binder in the refractory industries due to its higher water solubility and greater bonding strength at low temperatures as it reacts with both basic and amphoteric oxides and has higher application temperature. In the present work, commercial-grade MAP is used in high-alumina castables, with different particle size distributions, as the sole binder. The effect of addition of 1 mass-% MgO as a setting accelerator to the castable compositions is also studied. Castables are processed as per conventional processing methods and heat treated after drying at 1000 and 1600 °C. Dried and fired compositions were evaluated for density and strength. Also micro-structural study of the 1600 °C sintered samples was carried out. Addition of MgO resulted in a marginal decrease in density values which may be due to a greater amount of hydrated phase formation and their decomposition at higher temperatures; but it significantly increased crushing strength for all the heat treatment temperatures. Greater bonding from faster reaction at low temperature and the formation of a liquid phase at higher temperatures are the reasons for such an enhancement.


phosphate bonding alumina castables MAP MgO addition properties microstructure 



The authors thankfully acknowledge the support of Mr. S. Mukherjee and Mr. S. Chatterjee for supplying different grades of alumina and the staff of the Department of Ceramic Engineering, NIT Rourkela for their support and help regarding different experimentation for the work.


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Copyright information

© Springer Fachmedien Wiesbaden GmbH, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Ceramic EngineeringNational Institute of TechnologyRourkela, OdishaIndia

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