Accession Number : ADA297745

Title :   Requalification of White Thermal Control Coatings.

Descriptive Note : Final rept. 15 Nov 91-15 Oct 94,

Corporate Author : IIT RESEARCH INST CHICAGO IL

Personal Author(s) : Harada, Yoshiro ; Deshpande, Mukund

PDF Url : ADA297745

Report Date : OCT 1994

Pagination or Media Count : 109

Abstract : The lIT Research Institute (IlTRI) supplies the aerospace community with three spacecraft thermal control coatings: S13G/LO-1, YB-71 (ZOT), and Z93, all of which incorporate inorganic potassium silicate as a component in their compositions. However, the particular potassium silicate being used, "PS7", is no longer manufactured. The objective of this requalification program was to develop coating formulations with a new silicate binder/encapsulant material. Encapsulation studies for S13G/LO-1 were conducted to obtain a stabilized Zn0 pigment for this silicone binder formula- tion. With the inorganic Z93 and YB-71 formulations, the new silicate binder was to provide equal or improved optical and physical behavior for these compositions. Studies indicate that Kasil 2130 (PQ Corporation) is a satisfactory replacement in S13G/LO-1 and Z93. The development of formulation, processing and application techniques have yielded 2130-based S13GP/L0-% and Z93P which show equivalent optical and physical behavior to their *PS7"-based predecessors. The suitability of Kasil 2130 as a binder in the zinc orthotitanate-pigmented Y3-71 has not been clearly determined, and studies are being continued. (MM)

Descriptors :   *OPTICAL PROPERTIES, *SPACECRAFT, *PROTECTIVE COATINGS, *TEMPERATURE CONTROL, *SILICATES, *HEAT RESISTANT MATERIALS, SPACE ENVIRONMENTS, PHYSICAL PROPERTIES, AEROSPACE SYSTEMS, ENCAPSULATION, REFLECTANCE, SOLAR RADIATION, BINDERS, PIGMENTS, REFLECTORS, SILICONES, POTASSIUM COMPOUNDS, WHITE(COLOR), OUTGASSING.

Subject Categories : Coatings, Colorants and Finishes
      Optics
      Unmanned Spacecraft
      Manned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE