Effect of Tetramethyl Ammonium Hydroxide on Dispersion of the Silicon Carbide Submicron Powders

Wang, Nan; Deng, Li Rong; Wang, Xiao Gang; Lu, Shu He

doi:10.4028/www.scientific.net/MSF.809-810.213

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Effect of Tetramethyl Ammonium Hydroxide on Dispersion of the Silicon Carbide Submicron Powders
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Effect of Tetramethyl Ammonium Hydroxide on Dispersion of the Silicon Carbide Submicron Powders

Abstract:

The distributed processing of β-SiC submicron powders were carried out by tetramethyl ammonium hydroxide (TMAH). The effects of dispersant on the dispersion stability of the β-SiC powders were investigated by the particle size, flow characteristics, morphology and other physical properties of the powder before and after dispersed treatment. The results show that the best dispersing state of SiC is obtained by using the ultrasonic 7mins. In these conditions, the suspension solid content of β-SiC is 8%, and the dosage of TMAH is 8wt.%. An optimum amount of TMAH is proved as 8wt.% when the solid content is kept as 8wt.%. The powder particle size has been reduced from 0.73μm to 0.45μm, and its flowability has improved significantly after low temperature drying. The dispersed powder has small particle size, uniform distribution and excellent dispersion stability.

Info:

Periodical:

Materials Science Forum (Volumes 809-810)

Main Theme:

2014 China Functional Materials Technology and Industry Forum

Edited by:

Guangming Zhao, Lixin Chen, Yu Tang, Lang He, Bin Long, Zunyu Nie and Haohua Chen

Pages:

213-217

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.809-810.213

Citation:

N. Wang et al., "Effect of Tetramethyl Ammonium Hydroxide on Dispersion of the Silicon Carbide Submicron Powders", Materials Science Forum, Vols. 809-810, pp. 213-217, 2015

Online since:

December 2014

Authors:

Nan Wang, Li Rong Deng *, Xiao Gang Wang, Shu He Lu

Keywords:

Disperse, Tetramethyl Ammonium Hydroxide, β-SiC

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$38.00

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Paper TitlePages

Study on Stability of Nano-Al₂O₃ Aqueous Suspension

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1023

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Authors: Hui Zhang, Yong Jie Yan, Zheng Ren Huang, Xue Jian Liu, Dong Liang Jiang

Abstract: Stable ZrB2-based ultra-high temperature ceramic slurries were prepared and characterized with a solid content 40 vol% by aqueous gelcasting which was suitable to form high quality and complexshaped ceramic parts. In the present work, Ammonium Citrate Tribasic (ACT) was used as the dispersant. The properties of ZrB2 slurry, and the influencing factors were investigated by conventional techniques such as sedimentation tests, particle size distribution measurements, electrokinetic measurements and rheological analysis. High solids loading and low viscosity slurry was obtained by controlling the optimal conditions for the ZrB2-based ceramic powders.

1756

Preparation of Complicated SiC Green Bodies via Aqueous Slip Casting

Authors: Yuan Li, Ji Qiang Gao, Jian Feng Yang

Abstract: Two domestic silicon carbide powders with different particle size distribution and one petroleum coke powder were blended in proportion and then dispersed in aqueous medium. Green bodies were solidified from these suspensions via conventional slip casting. The effects of pH, solid loading, and the amount of dispersant on the formability and packing ability were evaluated. The results showed that the pH within 9.5-10.5, solid loading of 42vol%, aging time more than 24h, and 0.3wt% of dispersant were optimal. Complicated green bodies with height of 300mm and thickness of 3.5mm were obtained. The corresponding suspension viscosity was 1200mPa∙s and the relative packing density was 64.8%. The density is 3.01g∙cm-3 and the flexural strength is 305±15 MPa after reaction sintering. These results may be attributed to accurately using of dispersant and in-depth study of processing parameter.

Fine Spherical Tungsten Powder Prepared by Precipitation Reaction

Authors: Tao Lin, Yan Jun Li, Cheng Yi Wu, Zhi Meng Guo

Abstract: The spherical tungsten powder was prepared by chemical reaction with ammonium tungstate and strong acids under ultrasonic and mechanical agitation. After precipitation reaction, the precipitate was dried and grinded, and then reduced into tungsten powder with hydrogen. The effects of acid kinds and dispersant on the fine tungsten powder were studied in this paper. The result shows that the acid kinds and its addition amount have great effect on the shape of tungsten particles. The tungsten powder with uniform particle size and spherical could be prepared by adding 17ml sulfric acid into 100ml ammonium tungstate. The tungsten particles can be finer and more dispersive, and have a spherical with addition of dispersant SDS (Sodium dodecyl sulfate). The particle size is about 1.5 micrometer.

967

Control over Dispersion Efficiency of Nano-Size Zno Particles in Aqueous Medium: Correlation between Dispersant Molecular Weight and Particle Size

Authors: Rudeerat Suntako, Nisanart Traiphol

Abstract: Aqueous suspensions of zinc oxide (ZnO) nanoparticles are prepared at 0.5 wt% solid content using polyacrylic acid (PAA) as a dispersant. Average particle sizes of the ZnO powder are 65, 175 and 225 nm and the dispersant molecular weights (MW) are 1.8k, 450k and 3000k g/mol. Particle dispersion and stability of the ZnO nanoparticles in aqueous suspensions are investigated to determine the efficiency of each PAA as a dispersant. It is found that the efficiency of PAAs depends significantly on their MW and size of the ZnO nanoparticles. At relatively low dispersant concentration, the PAA(1.8k) is the most efficient one for all ZnO nanoparticles. When the dispersant concentration and size of the ZnO nanoparticles increase, the PAA(450k) becomes the most efficient one. The PAA(3000k) is the worst dispersant in all conditions. This research provides a fundamental knowledge on relationship between particle size and dispersant MW, which is essential for producing a well-dispersed and highly stable aqueous suspension.

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