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Thread: Depositing black chromium

Created on: 08/21/08 12:00 AM

Replies: 1

dhyatt83





Joined: 08/21/08

Posts: 1

Depositing black chromium
08/21/08 5:24 PM

We are interested in RF sputter depositing black chromium, e.g., Al
(80)Cr(20), but there doesn't appear to be much in the literature
that describes how to do this. Could anyone suggest either a good
reference, or some know how that might help us move forward?

Dan


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vascoteixeira





Joined: 08/29/08

Posts: 2

RE: Depositing black chromium
08/29/08 5:32 AM

Dear Dan


If you need black chromium for solar energy applications (thin solar absorber surfaces for high efficiente thermal collectors) I think the best ways should be DC magnetron sputtering. Back chromium is obtained by controlling mainly the addition of oxygen to the Ar plasma, in order to have not a stoichometric Chromium oxide.If you read some of my published paers you see howwe have controlled this by nanograduatation of metal/oxide nanolayers.
We already have finished a R&D project in cooperation with the INETI (DER-
Renewable Energy Department in Portugal) concerning the development of several absorbers films for highly efficient solar collectors (emmissivity of the order of 4% and solar
absorptivity of 95%), both for residential water heating (using Cr-Cr2O3 or
TiNxOy) or industrial systems at high temperature (using Mo-Al2O3) using clean
Physically Vapour Deposition (PVD) technologies. We have developed a
nanocomposite graded structure Mo-Al2O3 as well TiNOX with very good spectral
selectivity and we are now seeking industrial partners for the technology
implementation. Now we have a new project which includes addition of nanoparticles and natural pigments to the aborber nanocomposite thin films. The main results where already presented in many thin fims and soalr energy conferences, including SVC technical meeting.

Please find enclosed some references (you can search for more scientific and technical papers/research projects in my website):

[1] “Spectrally selective composite coatings of Cr-Cr2O3 and Mo-Al2O3 for solar
energy applications”,V. Teixeira, E. Sousa, M.F. Costa, C. Nunes, L. Rosa, M.J.
Carvalho, M. Collares-Pereira, E. Roman, J. Gago, Thin Solid Films, 392, p. 320-
326, 2001

[2] “Microtopographic Inspection of Solar Absorbers”, M. F. Costa, V. Teixeira,
C. Nunes, Solar Opt. Materials XVI, SPIE vol. 3789, 140-148, 1999

[3] “Graded cermet selective coatings based on chromium and titatium”, C.
Nunes, V. Teixeira, m. L. Prates, N.P. Barradas, A. D. Sequeira,in “Advanced
Coatings on Glass & Plastics for Large-Area or High-Volume Products”, ed. C.P.
Klages, H.J. Gläser, M. A. Aegerter, Braunschweig, Germany, p. 547-553,2002

Best Regards

Vasco
_____________________________
Vasco Teixeira
University of Minho
GRF-Functional Coatings Group
Portugal
http://www.pvdcoatings.eu
http://www.arauto.uminho.pt/pessoas/vteixeira


Symposium Symposium on Nanotechnology Approaches, Nanomaterials and Thin Films for Energy Technologies
http://vteixeira.com.sapo.pt/Nanomaterials_for_Energy_Technologies2008.htm


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