Metallurgical analysis and high temperature degradation of the black chrome solar selective absorber
The characteristics of black chrome, a solar selective absorber, have been the object of much interest by solar materials scientists. For this study, a well known coating, Harshaw Chemical Company's Chromonyx was selected for detailed scrutiny of its properties and degradation modes when exposed to high temperatures. Both as-plated and annealed microstructural models were presented. Technical means used in this microstructural characterization were: scanning and transmission electron microscopy, Auger depth profiling hemispherical reflectance and energy dispersive x-ray analysis. From these results a physical metallurgical model for wavelength selective properties of the coating was developed. Thus, it was observed that black chrome degraded as Cr/sub 2/O/sub 3/ oxide particles grew and chromium depleted. This effect was pronounced in air and to a lesser degree in medium vacuum. Oxidation by preferential diffusion and outgassing which causes structural changes, may take place.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5446467
- Report Number(s):
- LBL-10293; CONF-800439-6
- Resource Relation:
- Conference: International conference on metallurgical coatings, San Diego, CA, USA, 21 Apr 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
BLACK CHROME
MICROSTRUCTURE
THERMAL DEGRADATION
SPECTRALLY SELECTIVE SURFACES
AUGER ELECTRON SPECTROSCOPY
CHROMIUM OXIDES
DEGASSING
ELECTRON MICROSCOPY
OXIDATION
SOLAR ABSORBERS
SPECTRAL REFLECTANCE
BLACK COATINGS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
COATINGS
CRYSTAL STRUCTURE
ELECTRON SPECTROSCOPY
EQUIPMENT
MICROSCOPY
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLAR EQUIPMENT
SPECTROSCOPY
SURFACES
TRANSITION ELEMENT COMPOUNDS
141000* - Solar Collectors & Concentrators
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies