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Ceramic science and
Dip coating techniques
If the withdrawal speed is chosen such that the sheer rates keep the system
in the Newtonian regime, the coating thickness can be calculated by the
Landau-Levich equation using:
h = coating thickness h = viscosity
gLV
= liquid-vapour surface tension r = density
g = gravity
Ceramic science and
Dip coating
Gelation process during dip coating process, obtained by
evaporationof the solvent and subsequent destabilization of the sol
Ceramic science and
Capillary coating
• Capillary or laminar flow coating process has been developed by Floch and
CONVAC Co. which combines the high optical quality of the dip coating
process with the advantage that all the coating liquid can be exploited. In
figure 7 the capillary coating process is shown schematically.
Ceramic science and
Spin coating
the substrate spins around an axis which should be perpendicular to the
coating area.
The spin-on process has been developed for the so-called spin-on glasses
in microelectronics and substrates with a rotational symmetry, e.g. optical
lenses or eye glass lenses.
final thickness of a spin coated layer on the processing and materials
parameters like angular velocity, viscosity and solvent evaporation rate by
the semi-empirical formula
Ceramic science and
Electrochromic cell
Ceramic science and
Hydrolysis and polycondensation
Ceramic science and
Un vetro antiriflesso attraverso speciali
trattamenti superficiali permette di ridurre
fino a dieci volte la quantità di luce
riflessa
Uncoated
side
AR
Coated Il processo sviluppato è stato
industrializzato e sta per entrare in
produzione
Uncoated
side
AR
Coated
Ceramic science and
Glass Strength improvement
Compressive stress coatings can be obtained by densifying ceramic or
glass coating systems, having a lower thermal coefficient of expansion than
the substrate glass and at the same time can be densified below the Tg
of
glass.
So it has been shown that borosillicate sol-gel coatings after densification
can improve the bending strength of float glass by the factor of 4.
Inorganic-organic composite coatings also show that the strength of glass
bottles can be improved substantially.

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Sol gel coating

  • 1. Ceramic science and Dip coating techniques If the withdrawal speed is chosen such that the sheer rates keep the system in the Newtonian regime, the coating thickness can be calculated by the Landau-Levich equation using: h = coating thickness h = viscosity gLV = liquid-vapour surface tension r = density g = gravity
  • 2. Ceramic science and Dip coating Gelation process during dip coating process, obtained by evaporationof the solvent and subsequent destabilization of the sol
  • 3. Ceramic science and Capillary coating • Capillary or laminar flow coating process has been developed by Floch and CONVAC Co. which combines the high optical quality of the dip coating process with the advantage that all the coating liquid can be exploited. In figure 7 the capillary coating process is shown schematically.
  • 4. Ceramic science and Spin coating the substrate spins around an axis which should be perpendicular to the coating area. The spin-on process has been developed for the so-called spin-on glasses in microelectronics and substrates with a rotational symmetry, e.g. optical lenses or eye glass lenses. final thickness of a spin coated layer on the processing and materials parameters like angular velocity, viscosity and solvent evaporation rate by the semi-empirical formula
  • 6. Ceramic science and Hydrolysis and polycondensation
  • 7. Ceramic science and Un vetro antiriflesso attraverso speciali trattamenti superficiali permette di ridurre fino a dieci volte la quantità di luce riflessa Uncoated side AR Coated Il processo sviluppato è stato industrializzato e sta per entrare in produzione Uncoated side AR Coated
  • 8. Ceramic science and Glass Strength improvement Compressive stress coatings can be obtained by densifying ceramic or glass coating systems, having a lower thermal coefficient of expansion than the substrate glass and at the same time can be densified below the Tg of glass. So it has been shown that borosillicate sol-gel coatings after densification can improve the bending strength of float glass by the factor of 4. Inorganic-organic composite coatings also show that the strength of glass bottles can be improved substantially.