The Dispersion of SiC Nanopowders in Ethanol

Abstract:

The dispersion of SiC nanopowders in ethanol solution was studied by sedimentation test, particle size measurement and TEM analysis. The dispersion behavior of SiC nanopowders in ethanol solution was strongly dependent on the pH values, types and amounts of dispersant. PEI was found to be effective for the dispersion of SiC nanopowders in ethanol solution. With the addition of PEI, the isoelectric points of SiC nanopowders in ethanol solution were at pH 9.5, and shift to pH 12.3. The stability of SiC suspension increased with the dispersant content increasing until reached 2.5 wt% PEI. The suitable pH value for the dispersion of SiC nanopowders should lower than 10.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 779-784
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.779
• Online since: June 2012
• Authors: Yang Hou, Ping Hu, Wen Bo Han
• Keywords: Dispersion, pH Value, Silicon Carbide (SiC), Suspension

References

[1] K. Niihara, K. Izaki and T. Kawakami, Hot-pressed Si3N4-32% SiC Nanocomposite from Amorphous Si-C-N Powder with Improved Strength above 1200 ºC, J. Mater. Sci. Lett. 10 (1990) 112-114.

DOI: 10.1007/bf00721925

[2] H.J. Yu, X.G. Zhou, et al., Mechanical properties of 3D KD-I SiC(f)/SiC composites with engineered fibre-matrix interfaces， Composites Sci. Eng. 77 (2011) 699-704.

DOI: 10.1016/j.compscitech.2011.01.014

[3] J. Ren, W.M. Wang, S.C. Lu, J. Shen, F.Q. Tang, Characteristics of Dispersion Behavior of Fine Particles in Different Liquid Media, Powder. Technol. 137 (2003) 91-94.

DOI: 10.1016/j.powtec.2003.08.057

[4] J. Lai, K.V.P. M. Shafi, A. Ulman, et al, One-Step Synthesis of Core(Cr)/Shell(g-Fe2O3) Nanoparticles, J. Am. Chem. Soc. 127 (2005) 5730-5731.

DOI: 10.1021/ja0443225

[5] Z.H. Lü, D.L. Jiang, J.X. Zhang, Q.L. Lin, Processing and Properties of ZrB2-SiC Composites Obtained by Aqueous Tape Casting and Hot Pressing, Ceram. Int. 37 (2011) 293-301.

DOI: 10.1016/j.ceramint.2010.08.044

[6] V. Medri, C. Capiani, D. Gardini, Slip Casting of ZrB2-SiC Composite Aqueous Suspensions, Adv. Eng. Mater. 12 (2010) 210-215.

DOI: 10.1002/adem.200900275

[7] G.H. Wang, P.S. Nicholson, Heterocoagulation in Ionically Stabilized Mixed-Oxide Colloidal Dispersions in Ethanol, J. Am. Ceram. Soc. 84 (2001) 1250-1256.

DOI: 10.1111/j.1151-2916.2001.tb00824.x

[8] T. Kakui, T. Miyauchi, H. Kamiya, Analysis of the Action Mechanism of Polymer Dispersant on Dense Ethanol Alumina Suspension using Colloidal Probe AFM, J. Eur. Ceram. Soc. 25 (2005) 655-661.

DOI: 10.1016/j.jeurceramsoc.2004.03.014

[9] S. Lee, Y. Sakka, Y. Kagawa, Dispersion Behavior of ZrB2 Powder in Aqueous Solution, J. Am. Ceram. Soc. 90 (2007) 3455-3459.

[10] J. Sun, L. Gao, Dispersing SiC Powder and Improving Its Rheological Behaviour, J. Eur. Ceram. Soc. 21 (2001) 2447-2451.

DOI: 10.1016/s0955-2219(01)00196-0

[11] M. Yang, C.M. Neubauer, H.M. Jennings, Interparticle Potential and Sedimentation Behavior of Cement Suspensions Review and Results from Paste, Advn Cem. Bas. Mat. 5 (1997) 1-7.

DOI: 10.1016/s1065-7355(96)00076-4

[12] F.Q. Tang, X.X. Huang, Y.F. Zhang, J.K. Guo, Effect of Dispersants on Surface Chemical Properties of Nano-Zirconia Suspensions, Ceram. Int. 26 (2000) 93-97.

[13] Z.P. Xie, J.T. Ma, Q.Xu, Y. Huang, Y.B. Cheng, Effects of Dispersants and Soluble Counter-Ions on Aqueous Dispersibility of Nano-Sized Zirconia Powder, Ceram. Int. 30 (2004) 219-224.

DOI: 10.1016/s0272-8842(03)00092-0

[14] J. Wang, L. Gao, Investigation of Interactions Between Polymer-Coated Nano-Y-TZP Particles by AFM, J. Mater. Sci. Lett. 18 (1999) 181-183.