Pokročilé technológie /

Techniky povlakovania



Fibre coating


General description

Diffusion bonding of coated multifilament fibre tows is used for the preparation of metal matrix composites (MMCs). Some coated layers prevent reaction between fibres and matrix or increase the surface wettability of fibres by molten metal.

Principle of operation

Metal coatings on continuous multifilament carbon fibre tows can be obtained by various technologies, such as chemical vapour deposition (CVD) process, physical vapour deposition (PVD) process, autocatalytic (electroless) plating process, electrolytic (galvanic), etc. All methods related to metals deposition on strand of fibres have common problem – i.e. how to spread effectively the tow at the beginning of the deposition process.

Typical applications

Preparation of copper matrix/carbon fibre composite.
Nickel coating of carbon fibres to increase electric conductivity in polymer matrix composites.
 
Copper coated T300Copper coated of Torayca T-300 carbon fibres
 
FabricFabric made from copper coated carbon fibre tow
 
Ni coated carbon fibresCross sectional view of Ni coated carbon fibres
 
Energy vs. countsEDS spectrum acquired from Ni coating (point +)
 
Ni coated CFNi coated carbon fibre tow
 
C fibre surface morphologyNi coating imprinting the C fibre surface morphology
 

Equipment


Plasma coating



Physical vapor deposition


General description

Physical vapor deposition presents a group of deposition techniques (evaporation, magnetron sputtering, and pulsed laser deposition) for preparation of thin films and coatings with thickness in the range from several nanometers to micrometers.

Principle of operation

Magnetron sputtering represents one of the mostly used PVD deposition techniques. Magnetron sputtering is a plasma coating process whereby sputtering material is ejected due to bombardment of ions to the target surface. The vacuum chamber of the PVD coating machine is filled with an inert gas, such as argon or reactive gas, such as nitrogen or oxygen. By applying a high voltage, a glow discharge is created, resulting in acceleration of ions to the target surface. The argon-ions will eject sputtering materials from the target surface (sputtering), resulting in a sputtered coating layer on the products in front of the target.

Typical applications

  • hard, wear resistant coatings
  • low-friction coatings
  • corrosion resistant coatings
  • decorative coatings
  • superconducting coatings
  • coatings with specific optical, or electrical properties
  • protective coatings for high-temperature applications

 MagnetronPrinciple of magnetron sputtering

Equipment