The role of talc in preparing steatite slurries suitable for spray-drying
-
Fernando A. C. Oliveira
Abstract
The present work was driven by the need to replace the source of talc (hereafter referred to as standard) used in the manufacturing of steatite ceramics at Rauschert Portuguesa Lda. For this purpose, several talc powders were characterised in terms of pH, mean particle size (d50), morphology and crystalline phases, as well as the rheological behaviour of the resulting slurries as functions of the type of clay, type of deflocculant and pH of the slurry. The main goal was to attain density at around 1.70 and viscosities ranging between 200 and 800 mPa · s suitable for spray-drying. Slurries resulting from the mixture of two types of talc and two types of clays were spray-dried and the powders obtained were characterised. The spray-dried powders were then pressed and sintered under typical processing conditions.
The results show that that the addition of a dispersant (deflocculant) considerably decreased the viscosity of the prepared slurries. Furthermore, the increase in pH did promote deflocculation. Steatite slurries were also found to be thixotropic. It was only possible to achieve the density level 1.70 by combining the deflocculant with dry steatite powder additions. D1, an aqueous solution of an anionic acrylic polymer sodium salt was found to be the most efficient deflocculant.
References
[1] Engineered Materials Handbook – Volume 4: Ceramics and Glasses, ASM International (1991).Search in Google Scholar
[2] C.G.Bergeron, S.H.Risbud: Introduction to Phase Equilibria in Ceramics, The American Ceramic Society (1994).Search in Google Scholar
[3] G.Hübner: Eur. J. Mineralogy3 (1991) 651.10.1127/ejm/3/4/0651Search in Google Scholar
[4] E.Vela, M.Peiteado, F.Garcí, A.C.Caballero, J.F.Fernandéz: Ceram. Int.33 (2007) 1325. 10.1016/j.ceramint.2006.04.015Search in Google Scholar
[5] H.S.Soykan: Ceram. Int.33 (2007) 911. 10.1016/j.ceramint.2006.02.001Search in Google Scholar
[6] W.E.Lee, A.H.Heuer: J. Am. Ceram. Soc.70 (1987) 349. 10.1111/j.1151-2916.1987.tb05007.xSearch in Google Scholar
[7] W.Mielcarek, D.Nowak-Wozny, K.Prociów: J. Eur. Ceram. Soc.24 (2004) 3817. 10.1016/j.jeurceramsoc.2003.12.030Search in Google Scholar
[8] P.Rohan, K.Neufuss, J.Matějíček, J.Dubskyý, L.Prchlík, C.Holzgartner: Ceram. Int.30 (2004) 597. 10.1016/j.ceramint.2003.07.004Search in Google Scholar
[9] F.Singer, S.S.Singer: Industrial Ceramics, Chapman & Hall Ltd., London, U.K. (1963).10.1007/978-94-017-5257-2Search in Google Scholar
© 2010, Carl Hanser Verlag, München
Articles in the same Issue
- Contents
- Contents
- Editorial
- Editorial October 2010
- History
- Interactions between dislocations and interfaces – consequences for metal and ceramic plasticity
- Deformation mechanisms in yttria-stabilized cubic zirconia single crystals
- Basic
- Superplasticity in nanocrystalline ceramics: pure grain boundary phenomena or not?
- Thermodynamic assessment of the Mn–Ni–O system
- Assessment of niobium segregation energy in migrating ferrite/austenite phase interfaces
- In-situ synthesis and characterization of Al2O3 nanostructured whiskers in Ti–Al intermetallic matrix composites
- Texture, structure and properties of Ni-based binary alloy tapes for HTS substrates
- Microstructure, texture, grain boundary characteristics and mechanical properties of a cold rolled and annealed ferrite–bainite dual phase steel
- Applied
- Microstructure and mechanical properties of differently extruded AZ31 magnesium alloy
- The role of talc in preparing steatite slurries suitable for spray-drying
- Preparation and evaluation of chitosan-gelatin composite scaffolds modified with chondroitin-6-sulphate
- Influence of volume fraction of martensite on the work hardening behaviour of two dual-phase steels with high and low silicon contents
- Controlled synthesis of prussian blue nanoparticles based on polymyxin B/sodium bis(2-ethylhexyl)sulfosuccinate/water/isooctane reverse microemulsion for glucose biosensors
- The melting diagram of the Ti–Dy–Sn system below 40 at.% Sn
- Preparation and photocatalytic properties of TiO2 film produced via spin coating
- DGM News
- Personal
Articles in the same Issue
- Contents
- Contents
- Editorial
- Editorial October 2010
- History
- Interactions between dislocations and interfaces – consequences for metal and ceramic plasticity
- Deformation mechanisms in yttria-stabilized cubic zirconia single crystals
- Basic
- Superplasticity in nanocrystalline ceramics: pure grain boundary phenomena or not?
- Thermodynamic assessment of the Mn–Ni–O system
- Assessment of niobium segregation energy in migrating ferrite/austenite phase interfaces
- In-situ synthesis and characterization of Al2O3 nanostructured whiskers in Ti–Al intermetallic matrix composites
- Texture, structure and properties of Ni-based binary alloy tapes for HTS substrates
- Microstructure, texture, grain boundary characteristics and mechanical properties of a cold rolled and annealed ferrite–bainite dual phase steel
- Applied
- Microstructure and mechanical properties of differently extruded AZ31 magnesium alloy
- The role of talc in preparing steatite slurries suitable for spray-drying
- Preparation and evaluation of chitosan-gelatin composite scaffolds modified with chondroitin-6-sulphate
- Influence of volume fraction of martensite on the work hardening behaviour of two dual-phase steels with high and low silicon contents
- Controlled synthesis of prussian blue nanoparticles based on polymyxin B/sodium bis(2-ethylhexyl)sulfosuccinate/water/isooctane reverse microemulsion for glucose biosensors
- The melting diagram of the Ti–Dy–Sn system below 40 at.% Sn
- Preparation and photocatalytic properties of TiO2 film produced via spin coating
- DGM News
- Personal
