Preparation of SiC reticulated porous ceramics with high strength and increased efficient filtration via fly ash addition
Preparation of SiC reticulated porous ceramics with high strength and increased efficient filtration via fly ash addition
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DOI：
10.1016/j.jeurceramsoc.2020.11.039
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发表时间：
2021-01-22
影响因子：
5.7
通讯作者：
Sang, Shaobai
中科院分区：
文献类型：
--
作者：
Liang, Xiong;Li, Yawei;Sang, Shaobai
提出了回收利用飞灰制备高强度、高过滤效率的碳化硅网状多孔陶瓷(SRPC)的新途径。研究了不同掺量的飞灰对硅酸盐混凝土的流变性、微观结构和润湿行为的影响。结果表明，当飞灰掺量小于30wt%时，有利于碳化硅浆料的触变性。此外，在1300℃下，SRPC中的飞灰完全转化为针状的莫来石，形成了含有微孔和窗口的多孔结构。掺入20wt%的飞灰的硅酸盐混凝土具有较高的强度，这是由于改善了碳化硅浆体的流变性和优化了骨架的微观结构所致。此外，在SRPC中添加飞灰还可以通过骨架的微孔化增加骨架与金属熔体之间的接触角，从而显示出提高过滤效率的潜力。
The new route for recycling fly ash was proposed to prepare SiC reticulated porous ceramics (SRPCs) with high strength and increased efficient filtration for molten metal filtration. The effects of fly ash on the rheological characteristics, microstructure evaluation and wetting behavior between SRPCs and molten metal were investigated. It was found that the fly ash was beneficial to thixotropic property of SiC slurry when its content was less than 30 wt%. Furthermore, fly ash in SRPCs was completely transformed into mullite with needle-shape at 1300 degrees C, forming a porous structure containing micro pores and windows. SRPCs containing 20 wt% fly ash exhibited a higher strength because of the improved rheological properties of SiC slurry and the optimized microstructure in skeleton. In addition, the added fly ash in SRPCs could increase the contact angle between skeleton substrate and molten metal via microporosization of skeleton, thus exhibiting the potential ability to improve the filtration efficiency.