Physical and rheological properties of nano-sized ceramic inks (Comunicazione a convegno)

Type
Label
  • Physical and rheological properties of nano-sized ceramic inks (Comunicazione a convegno) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • E. Cinotti, D. Gardini, F. Matteucci, G. Baldi, M. Dondi, C. Galassi (2005)
    Physical and rheological properties of nano-sized ceramic inks
    in 9th Conference of the European Ceramic Society, Portoroz, Slovenia, June 19-23, 2005
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E. Cinotti, D. Gardini, F. Matteucci, G. Baldi, M. Dondi, C. Galassi (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Advanced Research Laboratory, Colorobbia Italia, Sovigliana Vinci, Italy Institute of Science and Technology for Ceramics, Faenza, Italy (literal)
Titolo
  • Physical and rheological properties of nano-sized ceramic inks (literal)
Abstract
  • Inks for direct ceramic ink-jet printing (DCIJP) are stable suspensions of a pigment dispersed in an organic/inorganic medium. Pigments must penetrate easily the surface of unfired glazes and bodies and must be refractory during firing. Research on ceramic decoration is focussing on nano-sized pigments, due to their stability in a ceramic ink and ability to bestow reliability to the printing system, in order to formulate ceramic inks suitable for DCIJP. In fact, micro-milled pigments cause problems, such as nozzle occlusion and difficult penetration in green ceramic bodies, that can be overcome by using nano-sized pigments, which however are difficult to be wet dispersed once synthesised as nanopowders. This work is aimed at optimising the ink application in DCIJP and its penetration in semi-finished ceramic tiles. Four different ceramic inks, with various pigment concentration, suitable for the four-colour process, were characterized studying both physical and rheological properties; in particular, particle size distribution, density, surface tension, viscosity, electrical conductivity and Z-potential were measured. Moreover, the penetration kinetics into different unfired bodies was experimentally appraised by evaluating the amount of ink absorbed in the unit of time and of surface area by the porous substrate. Results show that all the inks are stable and both surface tension and viscosity fulfil the requirements for DCIJP. Besides ceramic ink viscosity varies of more than one order of magnitude heating the inks from 25 to 85°C. The electrical conductivity is influenced by pigment composition. Concerning the penetration kinetics, it is mostly influenced by pigment concentration and composition, though it changes significantly depending on the substrate composition, microstructure and processing. (literal)
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