Mechanical behavior and thermal shock resistance of MgO-C refractories: Influence of graphite content |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;2. Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Isfahan, Iran;1. Federal University of São Carlos, Materials Engineering Department, Rod. Washington Luiz, km 235, São Carlos, SP 13565-905, Brazil;2. Magnesita Refratários S.A., Research and Development Center, Praça Louis Ensch, 240, Contagem, MG 32210-900, Brazil;1. School of Mechanical Systems Engineering, Kookmin University, Seoul 136-702, Republic of Korea;2. School of Materials Science and Engineering, Changwon National University, Changwon 641-773, Republic of Korea;3. Technical Research Laboratories, POSCO, Pohang 790-785, Republic of Korea;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430081, PR China;2. Chair of Ceramics, Montanuniversität Leoben, A-8700 Leoben, Austria;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 |
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| Abstract: | The mechanical and thermo-mechanical properties of MgO-C refractories are of major importance in the industrial applications, and highly depend on the optimization of their microstructural design. In the present work, the influence of flaky graphite content on mechanical behavior and thermal shock resistance of such refractories was investigated with the aid of the wedge splitting test, fractal and microscopic fractographic analysis. The results showed that the increase of graphite content in the specimens led to an enhanced non-linear fracture behavior, a reduced nominal notch tensile strength (σNT), and a higher specific fracture energy (Gf), characteristic length (lch) and thermal shock resistance parameter (Rst). The fractal analysis of the crack propagation path of the specimens after the wedge splitting test indicated that increasing graphite content in the refractories can enhance their irregularity of the crack propagation path during fracture. Also, it was suggested from microscopic fractographic analysis that the improvement of thermal shock resistance of MgO-C refractories was positively correlated with the increase of interface crack propagation. |
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| Keywords: | Mechanical behavior Thermal shock resistance Graphite MgO-C refractories |
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