Microstructures and mechanical properties of Al2O3–ZrO2–C refractories using silicon, microsilica or their combination as additive
Microstructures and mechanical properties of Al2O3–ZrO2–C refractories using silicon, microsilica or their combination as additive
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DOI：
10.1016/j.msea.2012.03.013
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发表时间：
2012-05
期刊：
影响因子：
6.4
通讯作者：
H. Fan;Yawei Li;Yupeng Huang;S. Sang;Yuanbing Li;Lei Zhao
中科院分区：
文献类型：
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作者：
H. Fan;Yawei Li;Yupeng Huang;S. Sang;Yuanbing Li;Lei Zhao
分别采用硅、硅微粉及其复合添加剂作为含碳耐火材料的添加剂。研究了添加剂对Al 2 O3-ZrO 2-C耐火材料显微结构和力学性能的影响。结果表明，在该类耐火材料中，硅是SiC晶须形成的主要因素，硅微粉是莫来石形成的主要因素，硅和硅微粉的结合使SiO2（g）分压升高，导致细SiC晶须和针状莫来石共存。不同的显微结构无疑会导致Al_2O_3-ZrO_2-C耐火材料力学性能的差异。硅的使用主要导致机械强度的提高，而微粉二氧化硅的添加主要引发韧性的改善。当硅和硅微粉复合作为添加剂时，Al 2 O3-ZrO 2-C耐火材料可同时获得优异的强度和韧性，这主要归因于硅添加剂形成的SiC晶须和硅微粉形成的针状莫来石的协同作用。
Silicon, microsilica and their combination were used as additive in carbon containing refractories, respectively. The effects of such additive on microstructures and mechanical properties of Al2O3–ZrO2–C refractories were investigated. The results show that in refractories of this kind, silicon is responsible for the formation of SiC whiskers; microsilica mainly dominates the formation of mullite; while their combination (silicon plus microsilica) brings high partial pressure of SiO(g) and leads to the co-existence of finer SiC whiskers and needle-like mullite. The various microstructures unquestionably cause differences in mechanical properties of Al2O3–ZrO2–C refractories. The use of silicon mainly results in an enhanced mechanical strength, while the addition of microsilica primarily triggers the improvement in toughness. When the combination of silicon and microsilica is used as additive, excellent strength and toughness can be obtained simultaneously in Al2O3–ZrO2–C refractories, which is mainly attributed to the synergistic effects of SiC whiskers formed from silicon additive and needle-like mullite formed from microsilica additive.