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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 >Microstructure and mechanical properties of lightweight Al2O3-C refractories using different carbon sources
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Microstructure and mechanical properties of lightweight Al2O3-C refractories using different carbon sources

机译：使用不同碳源轻质Al2O3-C耐火材料的微观结构和力学性能

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摘要

Two lightweight Al2O3-C refractories containing microporous corundum aggregates were fabricated by using flake graphite and microcrystalline graphite as the carbon source. The effect of these carbon sources on the microstructure and mechanical properties of lightweight Al2O3-C refractories with a silicon additive was then investigated. Using microcrystalline graphite resulted in more SiC whiskers in the microporous corundum aggregates compared to the specimens using flake graphite because microcrystalline graphite had a higher reactivity. The higher amount of SiC whiskers led to a more intertwined and compacter microporous aggregate/matrix interface structure. Due to the improved microporous aggregate/matrix interface together with the reinforcing effect of the well-developed SiC whiskers, the crack propagation along the aggregate/matrix interface was suppressed, whereas the percentage of cracks propagating within the aggregates was enhanced. Therefore, the lightweight Al2O3-C refractories using microcrystalline graphite had a similar apparent porosity of 24.5%, a similar bulk density of 2.71 g/cm(3) but a 14.3% increased cold modulus of rupture (25.6 MPa), a higher fracture energy and a somewhat higher toughness than the ones using pricier flake graphite. Overall, the study provides a framework for the industrial application of lightweight Al2O3-C refractories with significantly improved mechanical properties. (C) 2020 Elsevier B.V. All rights reserved.
机译：以片状石墨和微晶石墨为碳源，制备了两种含微孔刚玉集料的轻质Al2O3-C耐火材料。研究了这些碳源对掺硅轻质Al2O3-C耐火材料微观结构和力学性能的影响。与使用鳞片石墨的试样相比，使用微晶石墨会在微孔刚玉骨料中产生更多的SiC晶须，因为微晶石墨具有更高的反应性。碳化硅晶须的含量越高，微孔骨料/基体界面结构越紧密。由于改进的微孔骨料/基体界面以及发达的SiC晶须的增强作用，骨料/基体界面上的裂纹扩展受到抑制，而骨料中裂纹扩展的百分比增加。因此，使用微晶石墨的轻质Al2O3-C耐火材料的表观孔隙率为24.5%，体积密度为2.71 g/cm（3），但冷断裂模量（25.6 MPa）增加了14.3%，断裂能更高，韧性略高于使用价格更高的片状石墨的材料。总的来说，该研究为机械性能显著改善的轻质Al2O3-C耐火材料的工业应用提供了框架。（C） 2020爱思唯尔B.V.版权所有。

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