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Open Access Nano Idea

Densification characteristics of chromia/alumina castables by particle size distribution

Jingming Zhao1, Taesuk Kim1, Gichul Kim1, Kyuhong Hwang1* and Dongsik Bae2

Author Affiliations

1 Engineering Research Institute, i-Cube Center, Gyeongsang National University, Jinju, 660-701, South Korea

2 Changwon National University, Changwon, 641-773, South Korea

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Nanoscale Research Letters 2012, 7:8  doi:10.1186/1556-276X-7-8

Published: 5 January 2012

Abstract

The quality of the refractories applied on integrated gasification combined cycle should be a key factor that affects both the reliability and the economics of gasifier operation. To enhance the workability of chromia/alumina castables, three types of ultrafine alumina powder were added to improve the workability. Densification behavior of such castables in the presence of ultrafine alumina was assessed through the measurement of parameters like flow value, viscosity, bulk density, apparent porosity, and microstructure evaluation by an SEM study. It's proved that the specific surface area and particle size distribution of ultrafine powders in matrix parts greatly influence the densification behavior of these castables.

Keywords:
densification; chromia/alumina; castables; IGCC