Optimisation of Performance of Dispersants in Aqueous Titanium Slips

Abstract:

Slip casting is a well-established ceramic casting technique used for large scale fabrication of ceramic products with complex shapes. A homogenous slip with a desired level of stability is required, which is controlled using a dispersant. This paper describes the selection and optimisation of various dispersants used to produce Ti powder slips. A consideration of the effect of concentration and pH of the solvent on the dispersion of anionic polyelectrolyte dispersants (Dispex N-40, Synthecol SD375 & Dolapix CE64) was examined by measuring the sedimentation height and rate, the streaming potential and the slip viscosity. It was found that Dolapix CE64 showed the best deflocculating effect at 0.3dw.% with pH of 7. In particular, the measurements on Dolapix CE64 gave consistent results. This indicated that Dolapix CE64 is an effective dispersant in the preparation of a titanium slip.

• Periodical: Key Engineering Materials (Volume 520)
• Pages: 330-334
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.520.330
• Online since: August 2012
• Authors: Qian Xu, Brian Gabbitas, Steven Matthews, De Liang Zhang
• Keywords: Dispersant, Sedimentation, Streaming Potential, Titanium Slip, Viscosity

References

[1] C. Wen, M. Mabuchi, Y. Yamada, K. Shimojima, Y. Chino and T. Asahina, Processing of biocompatible porous Ti and Mg, Scripta Materialia. 45 (2001) 1147-1153.

DOI: 10.1016/s1359-6462(01)01132-0

[2] L. Chen, T. Li, Y. Li, H. He and Y. Hu, Porous titanium implants fabricated by metal injection molding, Transactions of Nonferrous Metals Society of China. 19 (2009) 1174-1179.

DOI: 10.1016/s1003-6326(08)60424-0

[3] S. W. Yook, B. H. Yoon, H. E. Kim, Y. H. Koh and Y. S. Kim, Porous titanium (Ti) scaffolds by freezing TiH2/camphene slurries, Materials Letters. 62 (2008) 4506-4508.

DOI: 10.1016/j.matlet.2008.08.010

[4] Y. Li, Z. Guo, J. Hao and S. Ren, Porosity and mechanical properties of porous titanium fabricated by gelcasting, Rare metals. 27 (2008) 282-286.

DOI: 10.1016/s1001-0521(08)60130-8

[5] X. Xu, M. I. L. L. Oliveira, R. Fu and J. M. F. Ferreira, Effect of dispersant on the rheological properties and slip casting of concentrated sialon precursor suspensions, Journal of the European Ceramic Society. 23 (2003) 1525-1530.

DOI: 10.1016/s0955-2219(02)00349-7

[6] M. P. Albano and L. B. Garrido, Processing of concentrated aqueous silicon nitride slips by slip casting, Journal of the American Ceramic Society. 81 (1998) 837-844.

DOI: 10.1111/j.1151-2916.1998.tb02417.x

[7] M. Kim, T. Yang, Y. Lee and H. Park, Dispersion stability of Y-TZP/Ce-TZP powder system and slip casting, Journal of materials science. 37 (2002) 1661 - 1665.

[8] Information on http: /www. wasanlab. com/pharm/flocc. html.

[9] Instruction Manual , Particle Charge Detection - PCD-03, Mutek, Germany, (1997).

[10] S. C. P. Cachinho and R. N. Correia, Titanium porous scaffolds from precursor powders: rheological optimization of TiH2 slurries, Powder Technology. 178 (2007) 109-113.

DOI: 10.1016/j.powtec.2007.04.014

[11] J. Zhang, F. Ye, J. Sun, D. Jiang and M. Iwasa, Aqueous processing of fine ZrO2 particles, Colloids and Surfaces A: Physicochemical and Engineering Aspects. 254 (2005) 199-205.

DOI: 10.1016/j.colsurfa.2004.12.012

[12] H. Sarraf, L. Skarpova and P. Louda, Influence of different anionic polyelectrolyte dispersants on the rheological and electrokinetic properties of carbon nanotubes, Annual Transactions-Nordic Rheology Society. 15 (2007) 253.

[13] J. Li, C. Van Blitterswijk and K. De Groot, Factors having influence on the rheological properties of Ti6A14V slurry, Journal of materials science: materials in medicine. 15 (2004) 951-958.

DOI: 10.1023/b:jmsm.0000042680.10087.15