Development of selective surfaces. Final technical progress report, September 11, 1978-March 31, 1980

Technical Report · Fri Aug 15 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/6990931· OSTI ID:6990931

Thornton, J. A.; Lamb, J. L.; Penfold, A. S.

Recent advances in sputtering technology using magnetically confined plasmas in so-called magnetron configurations permit coatings to be deposited over large areas with significantly increased deposition rates. Work is described in which cylindrical-post magnetron sources were used to deposit cermet type selective absorber coatings by reactively sputtering both stainless steel and chromium in Ar-O/sub 2/ and in Ar-CO gas mixtures. In addition, Cr/Al/sub 2/O/sub 3/ graded cermet coatings were deposited by co-sputtering from Cr and Al/sub 2/O/sub 3/ post-magnetron sources. The substrates were aluminum foil and aluminum-coated glass. In other work, multi-layer Al/sub 2/O/sub 3/-Mo-Al/sub 2/O/sub 3/ coatings were deposited using both cylindrical-post and hollow magnetron sources. Both reactive sputtering and direct rf sputtering of alumina were used to form the Al/sub 2/O/sub 3/ layers. The substrates were molybdenum-coated stainless steel and glass. All of the coatings yielded hemispherical absorptances (..cap alpha../sub H/) of 0.90 or more and hemispherical emittances (epsilon/sub H/) at 20/sup 0/C of 0.10 or less. However, the Al/sub 2/O/sub 3/-Mo-Al/sub 2/O/sub 3/ coatings yielded the best optical performance (..cap alpha../sub H/ = 0.95, epsilon/sub H/ = 0.06) and thermal stability (550/sup 0/C in air and 700/sup 0/C in vacuum).

• Research Organization: TELIC Corp., Santa Monica, CA (USA)
• DOE Contract Number: AC04-78CS35306
• OSTI ID: 6990931
• Report Number(s): TELIC-80-1
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTIVITY
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERMETS
CHALCOGENIDES
CHROMIUM
CHROMIUM ALLOYS
COATINGS
COMPOSITE MATERIALS
CORROSION RESISTANT ALLOYS
DATA
ELECTRON TUBES
ELECTRONIC EQUIPMENT
ELEMENTS
EMISSIVITY
EQUIPMENT
EXPERIMENTAL DATA
FABRICATION
GRAPHS
HEAT TREATMENTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MAGNETRONS
MATERIALS
METALS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
MOLYBDENUM
NUMERICAL DATA
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METALS
SOLAR EQUIPMENT
SPECTRALLY SELECTIVE SURFACES
SPUTTERING
STAINLESS STEELS
STEELS
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENTS