Structure of a black chrome solar selective surface

Conference · Sat Jul 01 04:00:00 EDT 1978

OSTI ID:6632511

Lampert, C M

The structure of ''CHROM-ONYX'' type of black chrome/metal selective absorber was studied to gain a better understanding of its influence upon the mechanism of wavelength selectivity. Spectral reflectance measurements were performed on seven samples. The best selectivity was found by these measurements to be 0.7 micron of black chrome on nickel and 1.0 micron of black chrome on copper. Both scanning and transmission electron microscopy were employed to study microstructure and chemical composition. As a result of the combined studies, some effects of black chrome thickness and the metallic substrate were determined. It was found that black chrome consisted of a very fine metallic distribution of particles of chromium, possibly suspended within a matrix of an oxide of chromium. This combination was, in turn, agglomerated into larger particles within the 0.05 to 0.3 micron size range. These larger particles formed a network which constituted the surface coating.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6632511
• Report Number(s): LBL-6691(Rev.); CONF-780808-11
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
BLACK CHROME
BLACK COATINGS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHROMIUM
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COATINGS
COPPER
CRYSTAL STRUCTURE
DIMENSIONS
ELECTRON MICROSCOPY
ELECTRON SCANNING
ELEMENTS
METALS
MICROSCOPY
MICROSTRUCTURE
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
REFLECTIVITY
SIZE
SOLAR ABSORBERS
SPECTRAL REFLECTANCE
SPECTRALLY SELECTIVE SURFACES
SUBSTRATES
SURFACE PROPERTIES
SURFACES
THICKNESS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS