Abstract: . . .  ceramic insulating materials are also likely to be used in this system. Outgassing is a major issue for these materials. The products of outgassing are typically reactive with the refractory metals and must be minimized. 14. SUBJECT TERMS 15. NUMBER OF PAGES Space power; Space propulsion; Solar power; Materials; Chemistry; Thermodynamics 17. SECURITY CLASSIFICATION OF REPORT 18. SECURITY CLASSIFICATION OF THIS PAGE 19. SECURITY CLASSIFICATION OF ABSTRACT 38 16. PRICE CODE 20. LIMITATION OF ABSTRACT Unclassified NSN 7540-01-280-5500 Unclassified Unclassified Standard Form 298 (Rev. 2-89) Prescribed . . .
. . .  insulating materials are also likely to be used in this system. Outgassing is a major issue for these materials. The products of outgassing are typically reactive with the refractory metals and must be minimized. 14. SUBJECT TERMS 15. NUMBER OF PAGES Space power; Space propulsion; Solar power; Materials; Chemistry; Thermodynamics 17. SECURITY CLASSIFICATION OF REPORT 18. SECURITY CLASSIFICATION OF THIS PAGE 19. SECURITY CLASSIFICATION OF ABSTRACT 38 16. PRICE CODE 20. LIMITATION OF ABSTRACT Unclassified NSN 7540-01-280-5500 Unclassified Unclassified Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. . . .
. . .  power system, or a thermopile. Materials are the limiting issue in such a system. Central is the durability of the crystal, which must maintain the required chemical, physical/optical, and mechanical properties as it is heated and cooled. This report summarizes available data to date on the materials issues with this system. We focus on the current leading candidate materials, which are sapphire (Al2O3) for higher temperatures and silica (SiO2) for lower temperatures. We use data from thermochemical calculations; laboratory coupon tests with silica and sapphire; and system tests with sapphire. The . . .
. . .  materials are also likely to be used in this system. Outgassing is a major issue for these materials. The products of outgassing are typically reactive with the refractory metals and must be minimized. 14. SUBJECT TERMS 15. NUMBER OF PAGES Space power; Space propulsion; Solar power; Materials; Chemistry; Thermodynamics 17. SECURITY CLASSIFICATION OF REPORT 18. SECURITY CLASSIFICATION OF THIS PAGE 19. SECURITY CLASSIFICATION OF ABSTRACT 38 16. PRICE CODE 20. LIMITATION OF ABSTRACT Unclassified NSN 7540-01-280-5500 Unclassified Unclassified Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. Z39-18 298-102 . . .
. . .  22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503. 1. AGENCY USE ONLY (Leave blank) 4. TITLE AND SUBTITLE 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED May 2005 Technical Memorandum 5. FUNDING NUMBERS Materials Chemistry Issues in the Development of a Single Crystal Solar/Thermal Refractive Secondary Concentrator 6. AUTHOR(S) WBS–22–972–30–03 Nathan S. Jacobson and Robert C. Biering 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER National Aeronautics and Space Administration John H. Glenn . . .
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