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Effect of air flow rate on preparation of boron carbide by sol-gel low-temperature pyrolysis system
Chengcheng Tian,Yang Li,Yuanxia Wang,Ying Shi,Li-Zhi Liu 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
The morphology and particle size of boron carbide in the sol-gel low-temperature pyrolysis system were controlled bychanging the air flow rate during the pyrolysis of boric acid glycerin system. Analyzed the infrared absorption propertiesof condensation products and pyrolysis products, as well as the carbon network structure of pyrolysis products and themicrostructure, phase composition, and particle size of boron carbide powder. The research results indicate that the airflowing in the pyrolysis atmosphere can accelerate the thermal decomposition efficiency of boric acid glycerol condensate andeffectively reduce the pyrolysis temperature. The faster the air flow rate during the pyrolysis process, the denser the carbonnetwork structure, smaller pore size, and more pores in the pyrolysis products, and the better the dispersion of boron oxide. Inthe boric acid glycerol system, with the increase of pyrolysis gas flow rate, the average particle size of boron carbide decreasesfrom 10 μm to about 2 μm. In addition, the morphology of boron carbide changes from a hexagonal diamond to a smoothermorphology. This indicates that by changing the air flow rate during the pyrolysis process, the carbon network structure ofthe pyrolysis products can be improved, thereby controlling the morphology and particle size of boron carbide. This paperprovides a new method for the study of the sol-gel low-temperature pyrolysis method to accurately control the morphology ofboron carbide.
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