Evaluation of High Temperature Structural Adhesives for Extended Service - Phase 4.
Contractor rept. 15 Oct 83-15 Oct 85,
BOEING AEROSPACE CO SEATTLE WA
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This report documents the work performed by the Boeing Aerospace Company for the National Aeronautics and Space Administration, Langley Research Center, under contract NAS1-15605 - Phase IV. The primary objective of this program was to evaluate three polymers as structural adhesives for bonding 6AlAV titanium for long-term applications at 505K 450 deg F. The three polymers evaluated for adhesive properties included 1 a crosslinkable polyquinoxaline x-PQ from NASA Langley, 2 polyphenylquinoxaline PPQ-2501 from King Mar Laboratories, and 3 polyphenyl-quinoxaline PPQ-HC from Hunt Chemical Corporation. Surface preparation for the titanium was 10 volt chromic acid anodize CAA according to Boeing Specification BAC 5890, Anodizing of Titanium for Adhesive Bonding. The original test matrix consisted of lap shear, crack extension, and climbing drum peel specimens of the three PPQ adhesives cured at 602K 6250F and evaluated at initial test temperatures from 219K -67 deg F to 505K 450 deg F. Testing was also completed after stressed Skydrol exposure, humidity exposure, and long term aging at 450K 350 deg F and 505K 450 deg F. A limited evaluation of PPQ-2501 and PPQ-HC adhesives was also completed on lap shear and crack extension specimens after a 644K 700 deg F cure, a portion of this work was completed on Boeing Independent Research and Development Programs.
- Metallurgy and Metallography