Microstructural and mechanical property evaluation of black chrome and zinc oxide coated solar collectors. Annual report No. II, June 1979-March 1980

Technical Report · Tue Jan 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/6727235· OSTI ID:6727235

Inal, O T

Plating parameters for black-chrome system were optimized with respect to selectivity utilizing simplex evolutionary operation procedures in sixteen sets of experiments. Overgrowths produced with the optimized parameters were then evaluated for optical, structural, thermal stability and mechanical properties. It is observed that the coatings produced possess consistently high selectivity values (approx. 10), are durable against exposure to high temperature (> 400/sup 0/C in air and > 500/sup 0/C in neutral atmosphere), are well attached to their structure (> 340 kg/cm/sup 2/), and are quite ductile (bent to 131.5/sup 0/ previous to fracture) and reasonably remain so following exposure to 500/sup 0/C (2 hrs) in air (84.2% bend previous to fracture). Black zinc oxide surfaces created on leaf zinc, electroplated zinc on steel, and hot-dip zinc coated steel substrates show selectivity values that vary between 6-9, are seen to maintain their physical integrity as well as optical properties following exposure to 250/sup 0/C (2 hrs) in air, possess high strength of attachment to their substrates (> 285 kg/cm/sup 2/), and are quite ductile (170/sup 0/ bend previous to fracture) and maintain a reasonably high ductility (121/sup 0/ bend previous to fracture) following exposure to 250/sup 0/C (2 hrs) in air. Structural analysis of both overgrowths show them to consist of oxide particles within which elemental component of the oxide is seen to be distributed in the unassociated form. The plating parameters utilized in deposition of the coatings are seen to alter quantity and distribution of the elemental component and effect optical properties of these surfaces. These composite particles are seen to be of various sizes but the distribution of these particles are seen to be constant throughout the overgrowth.

• Research Organization: New Mexico Inst. of Mining and Technology, Socorro (USA). Dept. of Metallurgical and Materials Engineering
• Sponsoring Organization: USDOE Division of Basic Energy Sciences, Materials Science Program
• DOE Contract Number: AS04-78AL04266
• OSTI ID: 6727235
• Report Number(s): DOE/AL/04266-T1
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
BLACK CHROME
MECHANICAL PROPERTIES
MICROSTRUCTURE
OPTICAL PROPERTIES
PLATING
SOLAR COLLECTORS
SPECTRALLY SELECTIVE SURFACES
FABRICATION
ZINC OXIDES
ELECTROPLATING
ABSORPTIVITY
BLACK COATINGS
DUCTILITY
EMISSIVITY
EXPERIMENTAL DATA
GRAPHS
PARTICLE SIZE
STABILITY
TABLES
TRANSMISSION ELECTRON MICROSCOPY
CHALCOGENIDES
COATINGS
CRYSTAL STRUCTURE
DATA
DEPOSITION
ELECTRODEPOSITION
ELECTROLYSIS
ELECTRON MICROSCOPY
EQUIPMENT
INFORMATION
LYSIS
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
SOLAR EQUIPMENT
SURFACE COATING
SURFACE PROPERTIES
SURFACES
TENSILE PROPERTIES
ZINC COMPOUNDS
141000* - Solar Collectors & Concentrators