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Title: Post Irradiation Evaluation of Thermal Control Coatings and Solid Lubricants to Support Fission Surface Power Systems

Abstract

The development of a nuclear power system for space missions, such as the Jupiter Icy Moons Orbiter or a lunar outpost, requires substantially more compact reactor design than conventional terrestrial systems. In order to minimize shielding requirements and hence system weight, the radiation tolerance of component materials within the power conversion and heat rejection systems must be defined. Two classes of coatings, thermal control paints and solid lubricants, were identified as material systems for which limited radiation hardness information was available. Screening studies were designed to explore candidate coatings under a predominately fast neutron spectrum. The Ohio State Research Reactor Facility staff performed irradiation in a well characterized, mixed energy spectrum and performed post irradiation analysis of representative coatings for thermal control and solid lubricant applications. Thermal control paints were evaluated for 1 MeV equivalent fluences from 1013 to 1015 n/cm2. No optical degradation was noted although some adhesive degradation was found at higher fluence levels. Solid lubricant coatings were evaluated for 1 MeV equivalent fluences from 1015 to 1016 n/cm2 with coating adhesion and flexibility used for post irradiation evaluation screening. The exposures studied did not lead to obvious property degradation indicating the coatings would have survived the radiationmore » environment for the previously proposed Jupiter mission. The results are also applicable to space power development programs such as fission surface power for future lunar and Mars missions.« less

Authors:
; ;  [1]; ; ;  [2]
  1. NASA Glenn Research Center at Lewis Field, Cleveland, OH 44135 (United States)
  2. Department of Mechanical Engr., Nuclear Engr. Program, The Ohio State Univ., Columbus, OH 43210 (United States)
Publication Date:
OSTI Identifier:
21054560
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 880; Journal Issue: 1; Conference: International forum-STAIF 2007: 11. conference on thermophysics applications in microgravity; 24. symposium on space nuclear power and propulsion; 5. conference on human/robotic technology and the vision for space exploration; 5. symposium on space colonization; 4. symposium on new frontiers and future concepts, Albuquerque, NM (United States), 11-15 Feb 2007; Other Information: DOI: 10.1063/1.2437504; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; ADHESION; ADHESIVES; DESIGN; FAST NEUTRONS; FISSION; HARDNESS; IRRADIATION; LUBRICATION; MATERIALS TESTING; MEV RANGE; REACTOR MATERIALS; RESEARCH REACTORS; SCREENING; SHIELDING; SOLID LUBRICANTS; SURFACES; TEMPERATURE CONTROL; NESDPS Office of Nuclear Energy Space and Defense Power Systems

Citation Formats

Bowman, Cheryl L., Jaworske, Donald A., Stanford, Malcolm K., Persinger, Justin A., Khorsandi, Behrooz, and Blue, Thomas E. Post Irradiation Evaluation of Thermal Control Coatings and Solid Lubricants to Support Fission Surface Power Systems. United States: N. p., 2007. Web. doi:10.1063/1.2437504.
Bowman, Cheryl L., Jaworske, Donald A., Stanford, Malcolm K., Persinger, Justin A., Khorsandi, Behrooz, & Blue, Thomas E. Post Irradiation Evaluation of Thermal Control Coatings and Solid Lubricants to Support Fission Surface Power Systems. United States. doi:10.1063/1.2437504.
Bowman, Cheryl L., Jaworske, Donald A., Stanford, Malcolm K., Persinger, Justin A., Khorsandi, Behrooz, and Blue, Thomas E. Tue . "Post Irradiation Evaluation of Thermal Control Coatings and Solid Lubricants to Support Fission Surface Power Systems". United States. doi:10.1063/1.2437504.
@article{osti_21054560,
title = {Post Irradiation Evaluation of Thermal Control Coatings and Solid Lubricants to Support Fission Surface Power Systems},
author = {Bowman, Cheryl L. and Jaworske, Donald A. and Stanford, Malcolm K. and Persinger, Justin A. and Khorsandi, Behrooz and Blue, Thomas E.},
abstractNote = {The development of a nuclear power system for space missions, such as the Jupiter Icy Moons Orbiter or a lunar outpost, requires substantially more compact reactor design than conventional terrestrial systems. In order to minimize shielding requirements and hence system weight, the radiation tolerance of component materials within the power conversion and heat rejection systems must be defined. Two classes of coatings, thermal control paints and solid lubricants, were identified as material systems for which limited radiation hardness information was available. Screening studies were designed to explore candidate coatings under a predominately fast neutron spectrum. The Ohio State Research Reactor Facility staff performed irradiation in a well characterized, mixed energy spectrum and performed post irradiation analysis of representative coatings for thermal control and solid lubricant applications. Thermal control paints were evaluated for 1 MeV equivalent fluences from 1013 to 1015 n/cm2. No optical degradation was noted although some adhesive degradation was found at higher fluence levels. Solid lubricant coatings were evaluated for 1 MeV equivalent fluences from 1015 to 1016 n/cm2 with coating adhesion and flexibility used for post irradiation evaluation screening. The exposures studied did not lead to obvious property degradation indicating the coatings would have survived the radiation environment for the previously proposed Jupiter mission. The results are also applicable to space power development programs such as fission surface power for future lunar and Mars missions.},
doi = {10.1063/1.2437504},
journal = {AIP Conference Proceedings},
number = 1,
volume = 880,
place = {United States},
year = {Tue Jan 30 00:00:00 EST 2007},
month = {Tue Jan 30 00:00:00 EST 2007}
}
  • Additional experimental data were desired to support the selection of candidate thermal control coatings and solid film lubricants for the McDonnell Douglas Aerospace (MDA) Space Station hardware. The third Evaluation of Oxygen Interactions With Materials Mission (EOIM-3) flight experiment presented an opportunity to study the effects of the low Earth orbit environment on thermal control coatings and solid film lubricants. MDA provided five solid film lubricants and two anodic thermal control coatings for EOIM-3. The lubricant sample set consisted of three solid film lubricants with organic binders one solid film lubricant with an inorganic binder, and one solid film lubricantmore » with no binder. The anodize coating sample set consisted of undyed sulfuric acid anodize and cobalt sulfide dyed sulfuric acid anodize, each on two different substrate aluminum alloys. The organic and inorganic binders in the solid film lubricants experienced erosion, and the lubricating pigments experienced oxidation. MDA is continuing to assess the effect of exposure to the low Earth orbit environment on the life and friction properties of the lubricants. Results to date support the design practice of shielding solid film lubricants from the low Earth orbit environment. Post-flight optical property analysis of the anodized specimens indicated that there were limited contamination effects and some atomic oxygen and ultraviolet radiation effects. These effects appeared to be within the values predicted by simulated ground testing and analysis of these materials, and they were different for each coating and substrate.« less
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  • The Air Force Space and Missile Systems Center and Wright Laboratory Materials Directorate sponsored an effort to reformulate and qualify Illinois Institute of Technology Research Institute (IITRI) spacecraft thermal control coatings. S-13G/LO-1, Z-93, and YB-71 coatings were reformulated because the potassium silicate binder, Sylvania PS7, used in the coatings is no longer manufactured. Coatings utilizing the binder{close_quote}s replacement candidate, PQ Corporation{close_quote}s Kasil 2130, were tested at the Materials Directorate{close_quote}s Space Combined Effects Primary Test and Research Equipment (SCEPTRE) Facility operated by the University of Dayton Research Institute (UDRI). The simulated space environment consisted of combined UV and electron exposure withmore » {ital in} {ital situ} specimen reflectance measurements. A brief description of the effort at IITRI, results and discussion from testing the reformulated Z-93 and S-13G/LO-1 coatings in SCEPTRE are presented. {copyright} {ital 1996 American Institute of Physics.}« less
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