Improving thermo-mechanical properties of tabular alumina castables via using nano structured colloidal silica

摘要

Great attempts were made to reduce the amount of calcium aluminate cementud(CAC) content in refractory castables to improve their hot strength. Using more than 2-3udwt% CAC may cause low melting phases formation in the refractory matrix leading toudweak thermo-mechanical propereties of the castables. Colloidal Silica can affect theudstructure of refractory castables to achieve superior thermo mechanical properties. Replacingudcalcium aluminate cement (CAC) by colloidal silica as a water base binder,udspeeds up drying, reduces the amount of liquid phase at high temperatures and may leadudto mullite formation, which will increase the hot strength of the refractory castables. Inudthis research, the influence of colloidal silica addition on bulk density, apparent porosityudand HMOR of a tabular alumina based refractory castable containing have been studied.udThe results showed that samples containing colloidal silica have higher hot strengthudcompared to those containing only CAC as binder due to the better compaction, lessudliquid phase formation at high temperature.When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20571