Effect of particle grading on fracture behavior and thermal shock resistance of MgO-C refractories |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. The National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China;3. School of Chemical Engineering, Qinghai University, Xining, 810016, China;4. College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, 430081, China;5. Zhengzhou Ruitai Refractory Materials Technology Co., Ltd., Zhengzhou, 450000, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China;2. Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA;3. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China;1. Laboratory for Materials Processing and Engineering, Department of Ceramic Engineering, National Institute of Technology, Rourkela, Odisha, India;2. Center for Nanomaterials, National Institute of Technology, Rourkela, Odisha, India;1. School of Metallurgy, Northeastern University, 3-11 Wen-Hua Road, Shenyang, 110819, China;2. The State Key Laboratory of Refractories and Metallurgy (Wuhan University of Science and Technology), Wuhan, 430081, China;3. Jiangsu Chianaref Refractory Co. Ltd., Yixing, 214200, China;1. Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, 75 Daxue Road, Zhengzhou, 450052, China;2. State Key Laboratory of Advanced Refractories, Luoyang, 471039, China;3. Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang, 471039, China;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan 430081, China;3. Chair of Ceramics, Montanuniversitaet, Peter-Tunner Strasse 5, 8700 Leoben, Austria;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan, China |
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| Abstract: | Two types of MgO-C refractories with tight particle grading and non-tight particle grading were prepared according to Andreasen's continuous packing theory. Fracture behaviors were investigated using wedge splitting tests combined with digital image correlation method and acoustic emission techniques. The results indicated that MgO-C refractory with non-tight particle grading treated at 1400 ℃ had more in situ phases (e.g., AlN and MgAl2O4) and exhibited less brittleness than specimens with tight particle grading even though they had similar nominal tensile strengths. In contrast, specimens with non-tight particle grading had greater horizontal strain under various loading stages, reflecting their better ability to resist rupture deformation. In addition, more microcracks were initiated earlier in the pre-peak region, and more energy was consumed. The decrease in coarse particles and corresponding increase in fine powder content increased the interface between particles, benefiting for reducing the local stress concentration and improving the thermal shock resistance of refractories. |
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| Keywords: | MgO-C refractories Particle grading Wedge splitting test Nondestructive techniques Thermal shock resistance |
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