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 °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.

提出了一种新的粉煤灰回收途径，以制备具有高强度和更高效率的SiC网状多孔陶瓷（SRPC），以进行熔融金属过滤。研究了粉煤灰对SRPC和熔融金属之间流变特性，微观结构评估和润湿行为的影响。发现当其含量小于30wt％时，粉煤灰有利于SiC浆料的触变性。此外，SRPC中的粉煤灰在1300°C时完全转变为针状莫来石，形成了包含微孔和窗口的多孔结构。含有20 wt％的粉煤灰的SRPC表现出更高的强度，这是因为SiC浆料的流变性得到了改善，并且骨架的微观结构得到了优化。此外，