REFLECTIVITY MEASUREMENTS OF SELECTED THERMAL CONTROL COATINGS IRRADIATED IN HIGH VACUUM.
Abstract
Several specimens of each of the following types of thermal-control coatings were irradiated for 200 hrs at a power level of 3 Mw by the Ground Test Reactor: Acrylic TiO2, Silicon alkyd TiO2, 3M White Velvet, MgO acrylic, Fe2O3, M-polyvinyl butyrol TiO2, ZnO/K2O SiO2, YO2/K2O SiO2, Anodized aluminum, and PV 100. Reflectance values for each of the above types were determined in the 0.3- to 26.4-micro range. The specimens were irradiated at the west position of the GTR irradiation cell while in a high-vacuum (.000001 torr) environment. The integrated neutron and gamma doses incident on the specimens were 10 to the 17th power nvt (E>10 kev) and 2 x 10 to the 11th power ergs/gm(C), respectively. After the apparatus containing the specimens had decayed sufficiently for safe handling, reflectance measurements were made. In the 0.3- to 2.2-micron range, the reflectance was measured in high vacuum (.000001 torr) by use of a MgO reference, a MgO-coated integrating sphere, a tungsten source, a fused-silica prism, and photomultiplier and lead sulphide detectors. In the 2.2- to 26.4- micron range, the reflectance was measured by use of a hohlraum, a gold reference, KBr, and CaF2 prisms, and a high-sensitivity thermocouple detector. The reflectance data obtained in this experiment indicated that all the thermal-control coatings except Fe2O3 were damaged to some extent by the reactor radiation. The MgO acrylic coating displayed the most change throughout the complete spectral range (0.3-26.4 microns). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0815911
Entities
People
- J. B. Wattier
- J. R. Bell
- R. H. Mcdaniel
Organizations
- General Dynamics