Effects of mullite gel on the properties of alumina castables
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The bauxite-based refractory castables are made up of well-graded bauxite aggregate, binding matrix, and a sufficient amountof water. There are four mullite samples with various percentages of sol such as 2%,5%,7% and 10% were added to thealumina castables compositions. The conventional castables processing is carried out and after heat treatment the resultantproduct is characterized. Prepared castables are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy(SEM) and Differential scanning calorimetry (DSC) to obtain the structural properties, morphology, and thermal analysis,respectively. Enhanced properties were obtained for the mullite samples with 5% and 7% sols. Considerably improved flexuralstrength, modulus of rupture (MOR) and pH levels are obtained for the mullite gel composition but with a relatively lowerlevel of permanent linear change (PLC). Great refractory properties were achieved after sintering at 1300 oC due to thepresence of mullite in the bond phase with very slight CaO. This enables their use in various refractory applications such asin steel ladles, furnaces, kilns, incinerators, and reactors.
Abstract
The bauxite-based refractory castables are made up of well-graded bauxite aggregate, binding matrix, and a sufficient amountof water. There are four mullite samples with various percentages of sol such as 2%,5%,7% and 10% were added to thealumina castables compositions. The conventional castables processing is carried out and after heat treatment the resultantproduct is characterized. Prepared castables are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy(SEM) and Differential scanning calorimetry (DSC) to obtain the structural properties, morphology, and thermal analysis,respectively. Enhanced properties were obtained for the mullite samples with 5% and 7% sols. Considerably improved flexuralstrength, modulus of rupture (MOR) and pH levels are obtained for the mullite gel composition but with a relatively lowerlevel of permanent linear change (PLC). Great refractory properties were achieved after sintering at 1300 oC due to thepresence of mullite in the bond phase with very slight CaO. This enables their use in various refractory applications such asin steel ladles, furnaces, kilns, incinerators, and reactors.
참고문헌 (23)
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