II. İLERİ TEKNOLOJİLER ÇALIŞTAYI (İTÇ 2011) - Bilgesam

chosen such that nucleation of new grains is favoured rather than growth of existing
grains.
This was achieved by using high deposition rates, formation of appropriate complexes
in the bath, addition of suitable surface-active elements to reduce surface
diffusion of ad-atoms, etc.
The process requires low initial capital investment and provides high production
rates with few shape and size limitations.
Innovation
Electrochemical processes are well-known form, prior art documents by discontinuous
electrochemical batch process.
In this invention, Roll-to Roll Electrochemical coating is used as a process. Engineering
parameters are quite different from discontinuous process, we need to control
flow rate of the substrate and electrolyte, tension, distance of the roll etc.
Preparation of Nano Layers Using Electrochemistry
The coating process is produced by electroplating, solar energy absorbing chromium
free nickel based film under constant current in different stages. Such materials
have a large absorptivity in the visible and near infrared range and have little
emissivity in the infrared range (α~ 95-97, ε ~ 6-8) with the α / ε values between 12
and 16. Copper sheets are used as substrate, but the similar process is applicable
with some modifications over Aluminium and/or Steel substrates.
Nano Layers by Electrochemistry
Electrochemical deposition of the thin and nano scale films may provide different
colour observation depending to the thickness of the dielectric layer (from dark blue
marine to dark brown).
Spectral Properties of Selective Surface
Re
fle
ct
an
ce
1,0
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0,0
hem. Reflectance α AM1.5 = 0.951, ε 373K = 0.079
dif. Reflectance
1 10
Wavelength in µm
61