Effect of microporous aggregates and spinel powder on fracture behavior of magnesia-based 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. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China;3. Chair of Ceramics, Montanuniversitaet Leoben, A-8700 Leoben, Austria;4. School of Chemical Engineering, Qinghai University, Xining 810016, China;1. Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;1. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, China;2. School of Chemistry and Resources Engineering, Honghe University, Mengzi 661199, China;3. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;4. Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230041, China;5. The State key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;6. Bengbu Institute of Metrology, Anmin Road 100, Economic Development Zone, Bengbu 233017, China;7. College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China |
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| Abstract: | The influences of microporous aggregates and spinel powder on the properties and fracture behavior of magnesia-based refractories were investigated by the three-point bending test and wedge splitting test with the digital image correlation method. With microporous aggregates instead of dense ones, lower thermal conductivity, higher cold modulus of rupture and compressive strength were observed for lightweight magnesia-based refractories. Besides, the results indicate that the strengthened interlocking interface between microporous aggregates and matrix in lightweight magnesia refractories decreased the proportion of crack propagation along the aggregate/matrix interface (PAM). This reduced the tortuosity of crack propagation as well as increased the brittleness. With the addition of spinel powder in the matrix, the pregenerated microcracks by thermal mismatch increased the PAM, which increased the tortuosity of crack propagation, improved fracture energy and reduced the brittleness. Lightweight magnesia spinel refractories merely showed a slightly higher brittleness than dense ones. |
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| Keywords: | Lightweight magnesia-based refractories Fracture behavior Mechanical properties Wedge splitting test Thermal conductivity |
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