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):
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.
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