用于凝胶注模成形的SiC/炭黑浆料的黏度控制

doi:10.19976/j.cnki.43-1448/TF.2022093

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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.

Key words： silicon carbide slurry gel casting dispersion viscosity

Received: 28 December 2022 Published: 04 May 2023

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	Articles by authors
	GUO Jinyu
	NI Zhentao
	LIU Peng
	YANG Xiaole
	LI Yuanbing
	YANG Xianfeng

Cite this article:

GUO Jinyu,NI Zhentao,LIU Peng, et al. Viscosity control of silicon carbide/carbon black suspension for gel casting[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(2): 160-169.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022093 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I2/160

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