Processing and Properties of Freeze Casted Alumina Mullite Refractories
In recent years,freeze gelation process has been used as a novel shaping method for manufacture of advanced and complex shaped ceramic products.In this process,gelation of a particulate silica sol binder is induced by freezing,allowing production of low shrinkage (<1%)ceramics with near net shape.Nevertheless,there is not any report about the use of this process in refractory industry.In this research,alumina castables containing colloidal silica binder were prepared and freezed to induce gelation.After defrost,the samples were dried and fired at different temperature followed by measuring their physical and mechanical properties (BD,AP and CCS).The results of green mechanical strength were compared with samples containing MgO powder as gelling additive.Also microstructure of the samples was studied by scanning electron microscopy.The results showed that by using freeze gelation process alumina mullite refractory bodies with improved properties can be made which is a result of nanostructured nature of colloidal silica imposed to the microstructure,leading to mullite formation at low temperatures.Finally,the potentials of the process for application in refractory industry were suggested.
M.Nouri Khezrabad F.Arianpour A.Talimian F.Golestani Fard N.Khalili
Refractory Research Group(RRG), School of Metallurgy and Materials Engineering,Iran University of Sc Aryan Fars Refractories Co, Shiraz Industrial Zone, Fars Province, Iran
国际会议
The 6th International Symposium on Refractories (第六届国际耐火材料会议)
郑州
英文
239-242
2012-10-18（万方平台首次上网日期，不代表论文的发表时间）