| Title | Influence of Reactive Micro Alumina Contents on the Microstructures and Mechanical Properties of Gel Bonded Corundum-Spinel Refractory Castables |
| Thematic area | Monolithics for Various Applications |
| Presenter | Miss Xu Nana |
| Authors | Miss Xu Nana, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Mr. Li Yuanbing, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Mr. Wang Qingheng, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Mr. Wei Hao, Alteo Shanghai Co., Ltd, Shanghai - China Mrs. Li Shujing, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China Mr. Xiang Ruofei, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan - China |
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Abstract
Corundum-spinel refractory castables were prepared by using tabular alumina aggregates, fused magnesia, reactive micro alumina, calcined micro alumina and gel powder as starting raw materials. While the different contents of calcined micro alumina were instead of reactive micro alumina, effects of the reactive micro alumina content on the microstructures and mechanical properties properties of the castables were investigated by means of X-ray diffractometer (XRD), scanning electron microscopy (SEM) and elastic modulus tester, etc. The slag resistance was tested by means of crucible test, and the results indicated that the slag penetration resistance increases and slag corrosion resistance decreases with increases in reactive micro alumina content. More irons of the penetrated slag can be absorbed on lattice vacancies in the in-situ spinel because of its smaller grain size and higher lattice distortion, and viscosity of the penetrated slag increase thus inhibiting further penetration. Key words: Corundum-spinel castables; Reactive micro alumina; Microstructure; Mechanical properties; Slag resistance |
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