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Study on Preparation and Rheology of High Solid Loading SiC Slurry

Author: HaoHui
Tutor: WuQiDe；JiXiaoLi
School: Wuhan University of Technology
Course: Building materials and engineering
Keywords: SiC Surface Modification Dispersion Rheology
CLC: TQ163.4
Type: Master's thesis
Year: 2006
Downloads: 311
Quote: 3
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Abstract


This article was synthesized by radical polymerization modifier containing a styrene - maleic anhydride copolymer (SMA) . The use of the modifier on the SiC powder surface modification, the surface containing the carboxylic acid group- modified powder was prepared . Use FHR the SiC powder structure before and after the modifier and modified for analysis ; were observed by TEM morphology and dispersion of the powder before and after modification ; modified SiC powder heating performance analysis using TG-DSC , and determining the amount of organic coating ; surface potential of the particle diameter measured by the charging characteristics of the surface of the SiC powder ; discuss a modified powder wetting , dispersion and rheological characteristics and its rheological curve model fitting ; powder dispersion and rheological mechanism . Studies have shown that the SiC surface grafted anhydride group - containing organic modifier to change the original surface electrical properties of SiC powder . After modification of the isoelectric point of the powder moves in the acidic direction , and powders maximum Zeta potential by -34.02mv improve - 48.54mv , dispersant TMAH Add the powder to further improve the Zeta potential . Powder wetting, dispersing and stability are greatly improved . Before the modification , the powder is dispersed in an aqueous medium stabilization mechanism for electrostatic stabilization , a modified powder rely on electrostatic space repulsion and solvates structural strength to achieve the stable dispersion of the powder . WD- 20 SMA modifier ratio is 1:1, the amount of the modifier for the 1 wt % , pH = 9 , the dispersing agent is added TMAH amount of 0.6wt% , the solid successfully Built each phase content of 58vol%, a viscosity of less than 1Pa.s SiC ceramic slurry . Modified SiC slurry flow curve fitting , of modified SiC slurry in the rheological properties of high solid content in line with the Krieger - Dougherty model , modified SiC slurry flow at low shear rates , varying characteristics close to Sisco model .

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CLC: > Industrial Technology > Chemical Industry > Electric industry, high - temperature products industry > The production of artificial ultra - hard materials > Carborundum ( silicon carbide)
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