Yu Guihang, Gao Wei, Yao Yanbin, Zhang Tingting, Fu Ying, Kong Xiangqing
School of Civil Engineering, Liaoning University of Technology, Jinzhou 121001, China.
Songshan Lake Material Laboratory, Dongguan 523808, China.
Materials (Basel). 2023 Oct 17;16(20):6724. doi: 10.3390/ma16206724.
In order to reduce the manufacturing cost of foamed ceramics and expand the application scope of industrial solid waste, in this study, a new type of environment-friendly foamed ceramics was prepared using direct high-temperature foaming with waste silicomanganese slag (SMS) and fly ash (FA) as raw materials and silicon carbide (SiC) as a foaming agent. The influence of SMS content, SiC content, and sintering temperature on the characteristics and microstructure of the specimen were explored. More concretely, the compressive strength, pore morphology, bulk density, and crystalline composition of the foamed ceramics were discussed. The foaming mechanism was also further analyzed. The results showed that including 20% SMS significantly reduced the melt's viscosity and stimulated bubble expansion. This, in turn, facilitated the creation of a porous structure. Moreover, it was noted that samples containing 20% SMS exhibited an anorthite phase when sintered at 1110 °C, resulting in enhanced compressive strength. The bulk density and compressive strength of the foamed ceramics decreased with an increase in the sintering temperature and SiC content. This trend was primarily attributed to the higher total porosity and the insufficient support of the pore wall to the matrix. The best all-around performance was achieved with 20 wt% SMS, 80 wt% FA as raw material, SiC addition of 1.0 wt%, and a sintering temperature of 1100 °C. Under these conditions, the compressive strength, bulk density, and total porosity of the foamed ceramics were 8.09 MPa, 0.57 g/cm, and 71.04%, respectively. Taken together, the outstanding porous structure and mechanical properties of this foamed ceramic make it suitable for use as insulation or for building partition materials.
为了降低泡沫陶瓷的制造成本并扩大工业固体废物的应用范围，本研究以硅锰废渣（SMS）和粉煤灰（FA）为原料，以碳化硅（SiC）为发泡剂，采用直接高温发泡法制备了一种新型环保泡沫陶瓷。探讨了SMS含量、SiC含量和烧结温度对试样性能和微观结构的影响。具体而言，讨论了泡沫陶瓷的抗压强度、孔隙形态、体积密度和晶体组成。还进一步分析了发泡机理。结果表明，加入20%的SMS显著降低了熔体粘度，促进了气泡膨胀。这反过来又有利于形成多孔结构。此外，还注意到含20% SMS的样品在1110℃烧结时出现钙长石相，从而提高了抗压强度。泡沫陶瓷的体积密度和抗压强度随烧结温度和SiC含量的增加而降低。这种趋势主要归因于总孔隙率较高以及孔壁对基体的支撑不足。以20 wt% SMS、80 wt% FA为原料，SiC添加量为1.0 wt%，烧结温度为1100℃时，综合性能最佳。在此条件下，泡沫陶瓷的抗压强度、体积密度和总孔隙率分别为8.09 MPa、0.57 g/cm和71.04%。综上所述，这种泡沫陶瓷优异的多孔结构和力学性能使其适合用作保温材料或建筑隔墙材料。
