Accession Number : ADA301731

Title :   Evaluation of High Temperature Structural Adhesives for Extended Service - Phase 4.

Descriptive Note : Contractor rept. 15 Oct 83-15 Oct 85,

Corporate Author : BOEING AEROSPACE CO SEATTLE WA

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

PDF Url : ADA301731

Report Date : OCT 1985

Pagination or Media Count : 56

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 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.

Descriptors :   *TITANIUM ALLOYS, *ADHESIVE BONDING, TEST AND EVALUATION, TEMPERATURE, PREPARATION, EXPOSURE(GENERAL), STRUCTURAL PROPERTIES, POLYMERS, HIGH TEMPERATURE, CRACKS, TEST METHODS, RESEARCH FACILITIES, SURFACES, ADHESIVES, HUMIDITY, QUINOXALINES.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE