Paper Title:
Statistical Modelling of the Particle Size Composition of an Alumina Matrix for No-Cement Self-Flowing Refractory Castables
  Abstract

In the processing of any particulate system (including refractory castables), the finer sized particle fraction (matrix or filler) is mostly responsible for the final system properties. Alumina fine powders were used in this work as raw materials, namely two tabular alumina fractions (–500 mesh and –230 mesh) and a commercial reactive alumina. Statistical modelling and the Response Surface Methodology (Statistica, Mixtures Designs and Triangular Surfaces module) were used to optimise the particle size composition of the three-component mixtures leading to matrix maximum flowability. The mixing methodology, aimed at minimising the water content, was kept constant. No-cement alumina castables produced with the various fine size powder mixtures, were used to prepare test-pieces. After drying and sintering, their mechanical resistance (MoR), density, porosity, water absorption, thermal shock behaviour and microstructure were evaluated. The results obtained evidenced the relevance of variables such as the water content per unit specific surface area, needed to reach the self-flow “turning point”, and validated the statistical optimisation method used. Moreover those results showed the existence of a matrix composition range, which favours the formation of a flow-bed that enables the aggregate self-flow.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
604-608
DOI
10.4028/www.scientific.net/MSF.514-516.604
Citation
A. P. Silva, A. M. Segadães, T. C. Devezas, "Statistical Modelling of the Particle Size Composition of an Alumina Matrix for No-Cement Self-Flowing Refractory Castables", Materials Science Forum, Vols. 514-516, pp. 604-608, 2006
Online since
May 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Abílio P. Silva, Ana M. Segadães, Tessaleno C. Devezas
Abstract:In this work, commercial alumina fine powders were used as raw materials, namely two tabular alumina fractions (–500 mesh and –230 mesh) and...
425
Authors: Abílio P. Silva, Ana M. Segadães, Tessaleno C. Devezas
Abstract:A self-flow refractory castable (SFRC) without cement requires a matrix of fine particles and a broad size distribution of coarse particles...
2260
Authors: D.G. Pinto, Abílio P. Silva, A.M. Segadães, T.C. Devezas
Abstract:Alumina, with high melting point (2050°C), high hardness and mechanical strength, and excellent abrasion resistance, is one of the most...
124
Authors: Zhao Jing Ming, Yang Zheng Xun, Hwang Kyu Hong, Park Sang Hwan
Abstract:Slagging coal gasifiers operate at temperatures as high as 1650°C in a reducing environment so that combustion chambers are lined with high...
235