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首页> 外文会议>第七届国际耐火材料学术会议（ISR2016）论文集 >Role of Mg in Al2O3-C Slide Plate Material
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Role of Mg in Al2O3-C Slide Plate Material

机译：镁在Al2O3-C滑板材料中的作用

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摘要

The Al2O3-C slide plate material with Mg addition has been prepared by tabular alumina, ultra fine alumina, graphite and Mg as starting materials,and resin as binder.The effects of Mg addition on phase composition, microstructure, physical and mechanical properties of unfired Al2O3-C material at different temperatures have been studied.The results show that Mg begins to react with CO or O2 to form MgO crystals at about 600 ℃ which causes some expansion and consequently increases apparent porosity slightly, but cold and hot strength increase noticeably which is attributed to MgO crystals interspersed in the corundum skeleton structure creating strengthening effect.MgO initially reacts with Al2O3 to form MgAl2O4 at about 1 000 ℃, the amount and size of MgAl2O4 increase with temperature from 1000 ℃ to 1 400 ℃.Due to strengthening effect of the in-situ formedMgAl2O4, cold and hot strength increase notably;but strength somewhat decreases after fired at 1 400 ℃ possibly due to micro-cracks resulting from expansion accompanying MgAl2O4 formation.
机译：以板状氧化铝，超细氧化铝，石墨和镁为原料，以树脂为黏合剂，制备了添加镁的Al2O3-C滑板材料。添加镁对未烧制相组成，显微组织，物理力学性能的影响研究了不同温度下的Al2O3-C材料。结果表明，Mg在约600℃时开始与CO或O2反应生成MgO晶体，引起一定的膨胀，从而使表观孔隙率略有增加，但冷，热强度明显提高。归因于MgO晶体散布在刚玉骨架结构中产生强化作用.MgO最初在约1000℃时与Al2O3反应形成MgAl2O4，MgAl2O4的数量和大小随温度从1000℃升高至1400℃而增加。在原位生成的MgAl2O4中，冷，热强度显着提高；但在1400℃焙烧后强度可能有所降低，这可能是由于微裂纹引起的。由于伴随着MgAl2O4的形成而膨胀。

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