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  • 1
    facet.materialart.
    Unknown
    Adaptation of an Ammonia Detecting Paint to Commerical Applications (1994)
    In:  CASI
    Details
    Publication Date: 2004-10-30
    Description: An ammonia-sensitive coating was developed in feasibility studies sponsored by Lockheed Engineering. The paint comprised a cellulosic binder, a dye, a family of solvents, and plasticizer. The resulting coating formulation proved to be very sensitive to trace levels of Lewis-bases and/or nucleophiles, but was limited to concentrations of approximately 1 ppm and higher. In the months following completion of this Lockheed project, efforts to perfect and optimize the paint formulation continued with internal funding. A unique sensitivity enhancing additive was identified and patented which when applied at concentrations of approximately 10% by weight, transcended the 1 ppm sensitivity barrier to fractional ppb. The paint composition was modified by the addition of certain proprietary agents, which promoted a much more intense yellow color in the coating and enhanced its durability in high-vacuum. Paint preparation is a simple one day procedure that can be completed using conventional equipment. Most of the materials are easily obtained.
    Keywords: Nonmetallic Materials
    Type: Dual-Use Space Technology Transfer Conference and Exhibition; Volume 1; 374-382; NASA-CP-3263-Vol-1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Repair of oxidation protection coatings on carbon-carbon using preceramic polymers (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The paper describes a field-applicable technique for the repair of damage to SiC protective coatings on carbon/carbon composites, using commercial preceramic polymers, such as perhydropolysilazane developed by the Southwest Research Institute and several commercial polymers (NICALON, PS110, PS116, PS117, NCP-200, and PHPS were tested). After being applied on the damaged panel and oxidized at 1400 C, these polymers form either SiC or Si3N4 (or a mixture of both). It was found that impact damaged carbon/carbon specimens repaired with perhydropolysilazane exhibit substantial oxidation resistance. Many of the other tested preceramic polymer were found to be unsuitable for the purpose of repair due to either low ceramic yield, foaming, or intumescence.
    Keywords: COMPOSITE MATERIALS
    Type: In: Damage and oxidation protection in high temperature composites. Vol. 1; Proceedings of the Symposium, 112th ASME Winter Annual Meeting, Atlanta, GA, Dec. 1-6, 1991 (A93-53937 23-24); p. 131-138.
    Format: text
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    NASA TECHNICAL REPORTS
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