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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of the reactivity and porous structure of expanded graphite (EG) on microstructure and properties of Al2O3-C refractories
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Effect of the reactivity and porous structure of expanded graphite (EG) on microstructure and properties of Al2O3-C refractories

机译：膨胀石墨（EG）的反应性和多孔结构对Al2O3-C耐火材料显微组织和性能的影响

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摘要

Al2O3-C refractories with Al, Si and SiO2 as additives were prepared in the coke bed in the temperature ranging from 800 degrees C to 1400 degrees C when expanded graphite (EG) was used as carbon source to partially or totally replace the graphite flake. The results showed that the EG accelerated in-situ formed ceramic phases in specimens fired at different temperature due to its higher reactivity than that of graphite flake. At 1000 degrees C, much more Al4C3 whiskers and AlN whiskers or lamellas formed in the matrix. At 1200 degrees C and 1400 degrees C, much more SiC whiskers with high aspect ratio were distributed in matrix of specimens. So, the mechanical properties such as modulus of rupture (CMOR), modulus of elasticity (E), force and displacement of Al2O3-C refractories with 0.2-0.5 wt% EG were improved in comparison with those without EG. Furthermore, the thermal shock resistance of Al2O3-C refractories was remarkably promoted with the addition of the EG, which was attributed to the absorption and release of the stress from porous structure of EG during thermal cycles. (C) 2015 Elsevier B.V. All rights reserved.
机译：当使用膨胀石墨（EG）作为碳源部分或全部替代石墨片时，在800℃至1400℃的温度范围内，在焦炭床中制备了以Al，Si和SiO2为添加剂的Al2O3-C耐火材料。结果表明，由于EG具有比石墨薄片更高的反应活性，因此在不同温度下焙烧的试样中EG促进了原位形成的陶瓷相。在1000摄氏度下，基体中形成了更多的Al4C3晶须和AlN晶须或薄片。在1200摄氏度和1400摄氏度下，更多高纵横比的SiC晶须分布在样品基质中。因此，与没有EG的那些相比，具有0.2-0.5wt％的EG的Al 2 O 3 -C耐火材料的机械性能例如断裂模量（CMOR），弹性模量（E），力和位移得到改善。此外，加入EG显着提高了Al2O3-C耐火材料的抗热震性，这归因于在热循环过程中EG多孔结构吸收和释放了应力。 （C）2015 Elsevier B.V.保留所有权利。

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