具有优异抗渣性能的CA<sub>6</sub>/AlON复合材料的制备研究

刘云松; 王恩会; 徐林超; 杨涛; 何志军; 梁彤祥; 侯新梅

doi:10.1007/s12613-022-2435-2

Volume 30 Issue 4

Apr. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(4): 756-765

Yunsong Liu, Enhui Wang, Linchao Xu, Tao Yang, Zhijun He, Tongxiang Liang, and Xinmei Hou, Synthesis of CA₆/AlON composite with enhanced slag resistance, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 756-765. https://doi.org/10.1007/s12613-022-2435-2

Cite this article as:

Yunsong Liu, Enhui Wang, Linchao Xu, Tao Yang, Zhijun He, Tongxiang Liang, and Xinmei Hou, Synthesis of CA6/AlON composite with enhanced slag resistance, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 756-765. https://doi.org/10.1007/s12613-022-2435-2

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研究论文

具有优异抗渣性能的CA₆/AlON复合材料的制备研究

1)
北京科技大学钢铁技术协同创兴中心，北京 10083，中国
2)
辽宁科技大学材料与冶金学院，辽宁 114051，中国
3)
江西理工大学材料科学与工程学院，江西 341000，中国

通讯作者:
王恩会 E-mail: houxinmeiustb@ustb.edu.cn

侯新梅 E-mail: wangenhui@ustb.edu.cn

文章亮点

(1) 采用两步法制备了CA₆和AlON两相分布均匀的CA₆/AlON复合材料，其中AlON的最佳添加量优化为10wt%。在此条件下，其体积密度和显气孔率分别为2.26 g·cm⁻³和20.2%。

(2) 相较于单相CA₆材料，CA₆/AlON复合材料表现出优异的抗熔渣侵蚀和渗透的能力。

(3)结合实验和分子动力学模拟等手段揭示了添加AlON对提升CA₆抗渣侵蚀性能的机理，即：AlON的加入在很大程度上降低了CA₆/AlON复合材料与熔渣的润湿性；熔渣释放出的O²⁻离子氧化AlON可形成Al₂O₃，Al₂O₃可进一步与Ca²⁺和O²⁻离子反应形成致密连续的CA₂层，能有效抑制熔渣的进一步渗透和腐蚀。

中文摘要

六铝酸钙(CA₆)作为一种具有优异综合性能的高温陶瓷备受关注。然而，CA₆独特的磁铅石结构容易导致晶粒各向异性生长形成板片状，不利于CA₆烧结致密化，当用作钢包内衬耐火材料时易因气孔率高导致其耐熔渣侵蚀和渗透能力下降。因此，提高CA₆的烧结致密性是目前亟需解决的问题。已有研究表明，第二相的加入是提高材料致密化的有效方法之一。受此启发，本文分别采用一步法和两步法在CA₆中加入不同量的AlON来提高CA₆的致密度进而提升其抗渣性能。其中，以Al₂O₃、CaCO₃和Al的混合物为原料的一步法制备过程中容易形成AlON团簇，最终导致CA₆/AlON复合材料孔隙率偏高。采用两步法时，先分别制备CA₆和AlON，然后将两者混匀并再次进行烧结，可形成CA₆和AlON均匀分布的复合材料。进一步通过实验优化，两步法中AlON的最佳添加量被确定为10wt%。在此条件下，CA₆/AlON复合材料的显气孔率(20%)相较于纯CA₆(29%)得到了明显改善。最后，以纯CA₆为对照组的试验表明，采用两步法制备的CA₆/AlON复合材料具有更好的抗熔渣腐蚀性能。原因主要有以下两个方面：（1）AlON的加入会在很大程度上减少CA₆/AlON复合材料的孔隙率，并且会降低复合材料在熔渣中的润湿性；（2）AlON会被熔渣释放的O²⁻离子氧化生成Al₂O₃，Al₂O₃与Ca²⁺和O²⁻离子发生反应，形成致密连续的CA₂层，可有效抑制熔渣的进一步渗透和腐蚀，从而提高CA₆/AlON复合材料的抗渣性能。

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Research Article

Synthesis of CA₆/AlON composite with enhanced slag resistance

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Abstract

Abstract

Different amounts of AlON have been introduced in calcium hexaaluminate (CA₆) using two approaches, that is, one-step and two-step methods, to improve the slag resistance of CA₆. A one-step method can directly sinter the mixtures combining Al₂O₃, CaCO₃, and Al in flowing nitrogen, in which AlON clusters are always formed because of the poor wettability of Al by Al₂O₃, leading to the high porosity of CA₆/AlON composite. In a two-step method, CA₆ and AlON are prepared separately and then mixed and sintered in flowing nitrogen. Compared with the sample prepared by the one-step method, CA₆ and AlON in composite by the two-step method are more uniformly distributed, and the optimized amount of AlON added is 10wt%. The slag corrosion and penetration test shows that the CA₆/AlON composite using the two-step method exhibits superior slag corrosion protection. The promoted effect of AlON on slag penetration and corrosion resistance is also discussed.
- CA₆/AlON composite;
- two-step method;
- wettability;
- slag resistance

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具有优异抗渣性能的CA₆/AlON复合材料的制备研究

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Synthesis of CA₆/AlON composite with enhanced slag resistance

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具有优异抗渣性能的CA6/AlON复合材料的制备研究

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Synthesis of CA6/AlON composite with enhanced slag resistance

Abstract

References

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具有优异抗渣性能的CA₆/AlON复合材料的制备研究

Synthesis of CA₆/AlON composite with enhanced slag resistance