Record Details
| Evaluation of thermal control coatings for use on solar dynamic radiators in low earth orbit | |||||||||
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| Abstract: | Thermal control coatings with high thermal emittance and low solar absorptance are needed for Space Station Freedom (SSF) solar dynamic power module radiator (SDR) surfaces for efficient heat rejection. Additionally, these coatings must be durable to low earth orbital (LEO) environmental effects of atomic oxygen, ultraviolet radiation and deep thermal cycles which occur as a result of start-up and shut-down of the solar dynamic power system. Eleven candidate coatings were characterized for their solar absorptance and emittance before and after exposure to ultraviolet (UV) radiation (200 to 400 nm), vacuum UV (VUV) radiation (100 to 200 nm) and atomic oxygen. Results indicated that the most durable and best performing coatings were white paint thermal control coatings Z-93, zinc oxide pigment in potassium silicate binder, and YB-71, zinc orthotitanate pigment in potassium silicate binder. Optical micrographs of these materials exposed to the individual environmental effects of atomic oxygen and vacuum thermal cycling showed that no surface cracking occurred. | ||||||||
| Publication Date: | Jun 01, 1991 | ||||||||
| Document ID: |
19910058774
(Acquired Nov 28, 1995)
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| Accession Number: | 91A43397 | ||||||||
| Subject Category: | SPACECRAFT PROPULSION AND POWER | ||||||||
| Report/Patent Number: | AIAA PAPER 91-1327 | ||||||||
| Document Type: | Preprint | ||||||||
| Publisher Information: | United States | ||||||||
| Organization Source: |
NASA Lewis Research Center; Cleveland, OH, United States Cleveland State Univ.; OH, United States NASA Langley Research Center; Hampton, VA, United States LTV Missiles and Electronics Group; Grand Prairie, TX, United States |
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| Description: | 12p; In English | ||||||||
| Distribution Limits: | Unclassified; Publicly available; Unlimited | ||||||||
| Rights: | Copyright | ||||||||
| NASA Terms: | EARTH ORBITS; LOW EARTH ORBITS; OXYGEN ATOMS; PAINTS; SOLAR ENERGY ABSORBERS; SPACE STATIONS; THERMAL CONTROL COATINGS; THERMAL EMISSION; ENVIRONMENT EFFECTS; FAR ULTRAVIOLET RADIATION; POTASSIUM SILICATES; RADIATION DOSAGE; SURFACE CRACKS; THERMAL CYCLING TESTS; ZINC OXIDES | ||||||||
| Imprint And Other Notes: | AIAA, Thermophysics Conference, 26th, Honolulu, HI, June 24-26, 1991. 12 p. Previously announced in STAR as N91-22367. | ||||||||
| Availability Source: | Other Sources | ||||||||