Preparation and characterization of alumina/calcium-hexaluminate ceramic composites from ferrotitanium slag |
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| Affiliation: | 1. Federal University of Sao Carlos, Graduate Program in Materials Science and Engineering, Brazil;2. Materials Microstructure Engineering Group (GEMM), FIRE Associate Laboratory, Federal University of São Carlos, Materials Engineering Department, Rodovia Washington Luis, Km 235, São Carlos, SP, 13565-905, Brazil;3. College of Technology (FATEC), Jordão Borghetti Street 480, Sertãozinho, SP, 14160-050, Brazil;1. The State Key Laboratory of Refractory and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Jiangsu Jingxin New Materials Co., Ltd., Yangzhou 225265, China;1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;2. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, 114051, China;4. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;1. School of Metallurgy, Northeastern University, 3-11 Wen-Hua Road, Shenyang 110819, China;2. School of Metallurgy Engineering, Liaoning Institute of Science and Technology, 176 Xiang-Kui Road, Benxi 117004, China;1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China;2. Department of Physics, Lvliang University, Lvliang, Shanxi 033001, China;3. Shanxi Engineering Vocational College, Taiyuan, 030009, China;4. Changqing Oil Fracturing Proppant Company Limited, Yangquan, 045240, China |
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| Abstract: | Low-cost alumina/calcium-hexaluminate (Al2O3-CaAl12O19) ceramic composites were prepared using ferrotitanium slag in this paper. By making use of the TiO2 and MgO originally existing in ferrotitanium slag, the sintering densification of Al2O3-CaAl12O19 composites was promoted. The results show that the optimum sintering temperature of the composites is 1500 ℃. The dominant sintering mechanism is the solid solution mechanism, i.e., Ti4+ and Mg2+ are dissolved in the CA6 and Al2O3 lattices and generate numerous defects, which ultimately enhance the lattice diffusion coefficient and matter transport. Sintering densification improves the specific heat capacity, thermal conductivity, and thermal shock resistance of Al2O3-CaAl12O19 composites. Thermophysical properties analysis indicates that the composites can be potentially used for thermal storage and the slag-utilized ratio is about 60 wt.%. However, the layered cleavage of CA6 limits further improvement of thermal shock resistance. |
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| Keywords: | Ferrotitanium slag Sintering mechanism Thermophysical properties Thermal storage |
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