Effect of B4C on the properties and microstructure of Al2O3 -SiC-C based trough castable refractories
Effect of B4C on the properties and microstructure of Al2O3 -SiC-C based trough castable refractories
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B4C对Al2O3-SiC-C基槽形浇注料性能和微观结构的影响
DOI：
10.1016/j.ceramint.2016.10.101
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发表时间：
2017-01-01
影响因子：
5.2
通讯作者：
Zhen, Qiang
中科院分区：
文献类型：
--
作者：
Wu, Jun;Bu, Naijing;Zhen, Qiang
研究了添加B4C （0.5 wt%、1 wt%、1.5 wt%、2 wt%）对Al2O3-SiC-C （ASC）槽型浇注料性能和组织的影响。结果表明，当B4C的加入量大于1wt %时，1450℃烧制后样品的容重减小。当处理温度超过1100℃时，B4C的加入显著提高了试样的冷断裂模量，其中B4C添加量为1.5 wt%的试样抗渣性能和抗热震性能最好。添加B4C的ASC浇注料在1450℃的室温下烧制后，在非氧化区形成了SiC纤维。实验结果表明，SiC的成核始于1000℃左右，在较高的温度条件下有利于SiC纤维的生长，而SiC纤维的成核则发生在直径为50200 nm、长度为10 ~ 50 μ m的样品中。可以观察到垂直于纤维生长方向的阶梯孪晶结构。最后，通过热力学计算对生长机理进行了解释。
The effect of B4C addition (0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%) on properties and microstructure of Al2O3-SiC-C (ASC) based trough castables was studied in this paper. The results showed that the bulk density of samples after firing at 1450 degrees C decreased when the addition of B4C was over 1 wt%. The cold modulus of rupture of samples improved significantly with the addition of B4C when the treating temperature was over 1100 degrees C. Among them, sample with 1.5 wt% of B4C had the best anti-slag performance and thermal shock resistance. The SiC fibers were formed in the non-oxidized zone of ASC castables with addition of B4C after firing at 1450 degrees C in air condition. The obtained fibers rooted in the walls of inner micropores of samples with the diameter of 50200 nm, and the lengths of 10-50 mu m. The experiment revealed the nucleation of SiC started at about 1000 degrees C, and then the growth of SiC fibers happened at higher temperature in a favorable condition. A stepped twin structure perpendicular to the growth direction of fibers could be observed. Finally, the growth mechanism was interpreted by thermodynamic calculations.