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3篇 您的检索式:作者名="B.Hashemi"
    题名 作者 年代 出处 被引量
1Kinetic Parameters Estimation of MgO-C Refractory by Shrinking Core Model显示文摘MgO-C refractories 的氧化的动力学被缩小核心当模特儿发生在加热多孔的材料到高温度期间的煤气固体的反应调查。包含 17 wt % 石墨是的 4.5 ~ 的样品等温线联盟者在 1000 ~ 1350deg C 氧化了。重量损失数据与模型的预言相比。加界面层气体转移由毛孔散开组成的混合 2 阶段机制被显示通常控制氧化率。毛孔散开是不管多么更有效,特别在比在强迫的传送对流刮空气下面的 10 wt % 低的石墨内容。模型计算证明有效煤气的散开系数在 0.08 ~ 0.55 cm^2/s 的范围。这些价值能被利用决定 6.85 ~ 2.22 的相应扭曲因素。与毛孔散开机制有关的活化能看起来在附近(46.4+-2) kJ/mol。估计的 intermodulardiffusion 系数被显示独立于石墨内容,当石墨的百分比超过了 10 的边缘的价值时。B.Hashemi Z.A.Nemati S.K.Sadrnezhaad Z.A.Moghimi 2006Journal of Materials Science & Technology2006,22,6:2
2Oxidation Mechanisms in MgO-C Refractories显示文摘An investigation on the oxidation mechanism of the graphite in the MgO-C refractory materials is helpful to improving both the quality of these materials and to preventing and/or lowering of the adverse effects of the high-temperature oxidation. In this research, the oxidation behavior of the MgO-C refractories containing 5~20 wt% graphite was studied via weight-loss method. Atmospheric air was used for oxidation at temperatures ranging from 900℃ to 1300°C and the experimental data were compared with those obtained from the dimensionless kinetic equations of the shrinking core model, in order to determine the oxidation mechanisms of the refractories. The best fit was achieved with the porous layer diffusion control regime. Oxidation mechanism tends, however, to slightly deviate from pure pore diffusion control to pore diffusion-external gas transfer regime in the samples having more graphite contents (e.g. 20%).B.Hashemi Z.Ali Nemati S.K.Sadrnezhaad 2004China's Refractories2004,13,2:1
3Oxidation Mechanism of C in MgO–C Refractory Bricks显示文摘S. K.Sadrnezhaad S.Mahshid B.Hashemi Z. A.Nemati 2006Journal of the American Ceramic Society2006,,4:1
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