アルミナ-ジルコニア-グラファイト系耐火物の特性に及ぼす粒度分布の影響
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概要
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Alumina-Zirconia-Graphite(AZG)refractory is one of the most important refractory for AISI 304 stainless steel strip casting, especially used as slide gates or nozzles. A suitable particle size distribution desired by simple R(c/m) values, weight of coarse Al_2O_3 (500-1000 μm)/weight of medium Al_2O_3 (61-125 μm), is important for controlling the apparent porosity, which affects the thermal shock resistance and erosion resistance as well. The size modulus, R(c/m) , has been shown to be a useful parameter for the evaluation of particle packing, as controlled by the particle size distribution, on various properties of the Alumina-Zirconia-Graphite refractory. The lowest apparent porosity (5%) and highest bulk density (3.5 g/cm^3) were obtained at R(c/m) value of 6.0. The relation of bulk density (D) with R(c/m) can be represented by D=-0.040R^2 (c/m)+0.351R(c/m)+2.741 for R(c/m) 0.4 to 3.7, and D=-0.006R^2(c/m)+0.080R(c/m)+3.272 for R(c/m) 3.7 to 13, respectively. The average pore size (P_s) with R(c/m) value is expressed as P_s=0.035R^2 (c/m)-0.554R^2(c/m)+7.138. The average pore size (P_s) of AZG refractory decreased from 6.5μm to 3.1 μm, as the R(c/m) increased from 0.4 to 6.0. The number of air exposure cycles for the thermal shock resistance (R_<st>) were 14-17, and the relation of thermal shock resistance with R(c/m) is correlated by R_<st>=0.160R^2(c/m)-1.371R(c/m)+16.860 for R(c/m) 0.4 to 3.7, and R_<st>=-0.007R^2(c/m)+0.277R(c/m)+13.082 for R(c/m) 3.7 to 13, respectively. The thermal shock resistance decreased gradually as the R(c/m) value was increased from 0.4 to 3.7. The effect of apparent porosity (P_o) on the erosion fraction (E_r) is expressed by E_r=0.233Po+1.204.
- 社団法人日本セラミックス協会の論文
- 1999-07-01
著者
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Yu S‐p
National Cheng Kung Univ. Tainan Twn
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Hon M‐h
National Cheng Kung Univ. Tainan Twn
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HON Min-Hsiung
Department of Materials Science and Engineering, National Cheng Kung University
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YU Shan-Pu
Department of Materials Science and Engineering, National Cheng Kung University
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WANG Moo-Chin
Department of Mechanical Engineering, National Kaohsiung Institute of Technology
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Wang M‐c
National Kaohsiung Univ. Applied Sci. Kaohsiung Twn
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Hon Min-hsiung
Department Of Materials Engineering National Cheng Kung University
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Wang Moo-chin
Department Of Mechanical Engineering National Kaohsiung Institute Of Technology
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Yu Shan-pu
Department Of Materials Science And Engineering National Cheng Kung University
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WANG Moo-Chin
Department of Fragrance and Cosmetic Science, Kaohsiung Medical University
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