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

Personal Author(s) : Hendricks, C. L. ; Hill, S. G. ; Hale, J. N. ; Dumars, W. G.

PDF Url : ADA300885

Report Date : FEB 1987

Pagination or Media Count : 68

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 (STPI/LaRC-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 F)/95% 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 STPl/LaRC-2 polymers maintained structural durability in all test environments.

Descriptors :   *METALS, *POLYMERS, *ADHESIVES, *POLYIMIDE RESINS, *METAL METAL BONDS, COMPRESSION, POWDERS, HIGH TEMPERATURE, CRACKS, TENSILE PROPERTIES, THIN FILMS, STAINLESS STEEL, STRENGTH(MECHANICS), CRACK PROPAGATION, ALUMINUM, BONDED JOINTS, AEROSPACE ENVIRONMENTS, CREEP, ARYL RADICALS, ETHERS, POLYSULFIDES, THERMOPLASTIC RESINS, BONDING, TITANIUM, FAILURE(MECHANICS), AEROSPACE INDUSTRY, HUMIDITY, SULFURIC ACID, SANDWICH CONSTRUCTION, HONEYCOMB STRUCTURES, QUINOXALINES.

Subject Categories : Polymer Chemistry
      Adhesives, Seals and Binders
      Metallurgy and Metallography
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE