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LAB TECH

Electrospraying of nanoscaled glass powders

• Feeding of nanoscaled glass and ceramic powders
• Preparation of glass coatings with high density and thicknesses in the range from 5 to 500 µm

Methods:

A suspension consisting of a mixture of ethanol, water and nanoscaled powder is fed through a metallic capillary tube. When an electric field is applied between the tube and the substrate, the liquid forms a sharp cone, known as Taylor cone, at the top of the tube. Fine droplets are then projected from the sharp cone forming an aerosol. The liquid evaporates rapidly since the aerosol shows a very high surface area.Thus the nanoscaled powder is deposited on the substrate without formation of agglomerates.

 Results:

• Preparation of dense glass coatings with high density and thickness up to 500 µm

 Application:

• Decorative coatings with improved or new functional properties 

• High temperature and corrosion coatings for metals

• Coatings for metals, glass and cera­mic parts improving wear

• Powder feeding for thermal spray techniques

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