Accession Number:

ADA300885

Title:

Evaluation of High Temperature Structural Adhesives for Extended Service - Phase V.

Descriptive Note:

Contractor rept.,

Corporate Author:

BOEING AEROSPACE CO SEATTLE WA

Report Date:

1987-02-01

Pagination or Media Count:

68.0

Abstract:

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 V. The primary objective of this program was to evaluate three experimental polymers as high temperature structural adhesives for bonding 6Al- 4V titanium and 17-7 PR stainless steel for long-term applications at 505K 450 F. The three experimental polymers were polyphenylquinoxaline PPQ, polyimide STPILaRC-2, and polyarylene ether PAE SO2. A fourth polymer, LaRC-TPI, was evaluated as an adhesive for titanium honeycomb sandwich bonding. Surface preparations for the metal adherends were 10 volt chromic acid anodize and Pasa-Jell 107 for titanium, and 2 volt sulfuric acid anodize for the stainless steel. The test matrix for evaluating the experimental adhesives consisted of metal-to-metal titanium lap shear, crack extension, and climbing drum peel specimens tested initially at temperatures ranging from 219K -65 F to 505K 450 F. Durability was determined as a function of strength retention after exposure to a variety of aerospace vehicle environments. These included humidity exposure 332K 120 F95 R.H. for 1,000 hours, high temperature exposure 450K 350 F and 505K 450 F for up to 3,000 hours, and stressed exposure to hydraulic fluid Skydrol. Durability of bonded stainless steel joints was determined on an abbreviated test matrix. PPQ and STPlLaRC-2 polymers maintained structural durability in all test environments.

Subject Categories:

  • Polymer Chemistry
  • Adhesives, Seals and Binders
  • Metallurgy and Metallography
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE