Microstructure and mechanical properties of CaAl12O19 reinforced Al2O3-Cr2O3 composites |
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| Affiliation: | 1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan, 243002, Anhui, China;2. College of Material Science and Engineering, Chongqing University, Chongqing, 400030, China;3. School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, 243002, Anhui, China;1. Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan;2. Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan;3. The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Osaka 567-0047, Ibaraki, Japan;1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;2. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang, Henan, PR China;3. Department of Materials Science and Engineering, University of Ioannina, GR-451 10, Ioannina, Greece;1. Department of Physics, Lvliang University, Lvliang, Shanxi 033001, China;2. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China |
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| Abstract: | Al2O3-Cr2O3 refractories have excellent slag corrosion resistance and can adapt to the oxidation/reduction atmosphere in the smelting reduction ironmaking furnace. However, Al2O3-Cr2O3 refractories have poor mechanical properties and sintering properties. In order to improve the mechanical properties of Al2O3-Cr2O3 materials, the CaAl12O19 reinforced Al2O3-Cr2O3 composites were prepared by pressureless sintering process, and the influences of CaO content on the sintering properties, mechanical properties, and microstructure evolution of the composites were studied. The results show that a small amount of CaO can significantly improve the compactness of the composites, which is mainly due to the formed sheet-like CA6 fill the gap between the solid solutions, and reduces the porosity of the composites. In addition, the sheet-like CA6 makes the connection between solid solutions closer, and the intergranular fracture gradually transforms into a mixed mode of intergranular and transgranular fracture. The best mechanical propertie is observed at S4 with the CaO content of 2 wt.%. Compared with sample S0 without CaO, the hardness, compressive strength and flexural strength of the S4 were increased by 35.19 %, 49.69 %, and 68.34 %, respectively. The addition of excessive CaO will deteriorate the mechanical properties of the composites, because the formation of a large number of layered CA6 increases the porosity of the composites. Furthermore, a small amount of CaO addition can significantly improve the thermal shock resistance of the composites. After 10 and 20 thermal shock cycles, the strength loss rates of S4 are only 5.83 % and 8.74 %, respectively. |
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| Keywords: | Microstructure Mechanical properties Strengthening mechanism Thermal shock resistance |
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