硅酸盐学报2018，Vol.46Issue(3)：341-346,6.DOI:10.14062/j.issn.0454-5648.2018.03.05
水热碳化制备碳微球及其在Al2O3-SiC-C浇注料中的应用
Preparation of Carbon Spheres by Hydrothermal Carbonization and Its Application in Al2O3-SiC-C Castable
摘要
Abstract
Monodispersed carbon spheres (CS) were preparedvia a hydrothermal carbonization method using starch as a starting material. The effect of process parameters (i.e., reaction temperature, reaction time and starch concentration) on the microstucture and particle size distribution of CS was investigated. Moreover, the substitution of ball pitch with CS on the preparation of Al2O3-SiC-C castable was discussed. The self-flow value and physical properties of CS containing castable were also analyzed. The results show that the CS is amorphous. The size and dispersion of the prepared CS can be easily controlled by the process parameters. The particle size of the prepared CS increases with increasing the reaction temperature and the starch concentration. The reaction time has a slight effect on the particle size of the prepared CS. However, a longer soaking time can result in the aggregation of the CS. The monodispersed CS with an average diameter of 1.3μm is obtained at the reaction temperature of 180℃, reaction time of 12h and starch concentration of 0.5mol/L. At the same amount of water, the self-flow value of the Al2O3-SiC-C castable containing 50％ (mass fraction) CS is 15mm higher than that of the castable only containing ball pitch when the substitution quantity of CS is 50％ (in mass fraction). The flexural strength and compressive strength of as-prepared CS containing castable increase from 6.7 and 29.2MPa for the castable containing only ball pitch to 7.6 and 48.0MPa, respectively.关键词
碳微球/水热碳化/淀粉/氧化铝-碳化硅-碳/浇注料Key words
carbon spheres/hydrothermal carbonization/starch/aluminium oxide-silicon carbide-carbon/castable分类
化学化工引用本文复制引用
李赛赛,王军凯,段红娟,李发亮,张海军..水热碳化制备碳微球及其在Al2O3-SiC-C浇注料中的应用[J].硅酸盐学报,2018,46(3):341-346,6.基金项目
国家自然科学基金面上项目(51472184,51472185) （51472184,51472185）
湖北省教育厅高等学校优秀中青年科技创新团队计划(T201602) （T201602）
湖北省自然科学基金创新群体项目(2017CFA004). （2017CFA004）
