Fabrication of spectrally selective solar surfaces by the thermal treatment of austenitic stainless steel aisi 321
The spectrally selective solar surfaces have been produced after heating the austenitic stainless steel aisi 321 at a firing temperature of 843* K. And for firing times ranging from 10 to 20 minutes. The heating was carried out in a constant temperature oven under normal atmospheric conditions. The optimum values of solar absorptance alpha S and near-normal emittance epsilon S were found to be alpha S 0.92+0.02, epsilon S 0.22 + or - 0.02 respectively. The corresponding values for the unheated steel were 0.50 + or - 0.02 and 0.22 + or - 0.22. Severe temperature treatments like quenching in liquid nitrogen at 77* K. Produced no adverse visible affect on the quality of the selective surfaces. It shows that the thermal coatings so produced are very tough and durable. The value of solar absorptance and near-normal thermal emittance remained unchanged after quenching in liquod nitrogen. The thermal coatings so produced not only offer a technical advantage but also economic advantage over any of the existing techniques for the manufacture of stainless steel solar panels.
- Assignee:
- IFI; EDB-82-001556
- Patent Number(s):
- US 4268324
- OSTI ID:
- 6254834
- Resource Relation:
- Patent File Date: Filed date 20 Apr 1979
- Country of Publication:
- United States
- Language:
- English
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Fabrication of spectrally selective surfaces by thermal treatment of austenitic stainless steel AISI 321
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Related Subjects
36 MATERIALS SCIENCE
SOLAR ABSORBERS
FABRICATION
SPECTRALLY SELECTIVE SURFACES
STAINLESS STEEL-321
HEAT TREATMENTS
AUSTENITIC STEELS
COATINGS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
EQUIPMENT
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
NICKEL ALLOYS
SOLAR EQUIPMENT
STAINLESS STEELS
STEELS
SURFACES
TITANIUM ADDITIONS
TITANIUM ALLOYS
141000* - Solar Collectors & Concentrators
360101 - Metals & Alloys- Preparation & Fabrication