Viscosity control of silicon carbide/carbon black suspension for gel casting
GUO Jinyu1, NI Zhentao1, LIU Peng1, YANG Xiaole2, LI Yuanbing2, YANG Xianfeng1
1. College of materials science and engineering, Changsha University of Science & Technology, Changsha 410114, China; 2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430080, China
Abstract：SiC/carbon black paste for gel casting was prepared, the viscosity and stability of the paste were measured by rotary viscometer and Zeta potential measuring instrument. The effects of polyvinylpyrrolidone (PVP) and processing parameters on the dispersion of carbon black were studied, and the main factors affecting the viscosity of SiC/carbon black suspension for gel casting were analyzed. The results show that the adsorption of PVP on the surface of carbon black particles can increase the absolute value of the Zeta potential of carbon black in water, and also can increase the steric repulsion between carbon black particles, thus the dispersion of carbon black particles in water is improved. The optimal amount of PVP addition to the carbon black slurry is 2.25 mg/m2, and the proposed ball milling time of the slurry is 9 h. Under the optimized process conditions that the grading of coarse and fine silicon carbide particles is 2∶1, the mass fraction of carbon black is 6%, and the mass fraction of monomer is 15%, the viscosity of the slurry is moderate, and it is suitable for gel casting of slurry with high solid content.
郭金玉, 倪振涛, 刘鹏, 杨小乐, 李远兵, 杨现锋. 用于凝胶注模成形的SiC/炭黑浆料的黏度控制[J]. 粉末冶金材料科学与工程, 2023, 28(2): 160-169.
GUO Jinyu, NI Zhentao, LIU Peng, YANG Xiaole, LI Yuanbing, YANG Xianfeng. Viscosity control of silicon carbide/carbon black suspension for gel casting. Materials Science and Engineering of Powder Metallurgy, 2023, 28(2): 160-169.
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2023, Vol. 28 
