Durability of Adhesively Bonded Aluminum and Titanium Performance for Non-Chemical Surface Treatments
Abstract
The durability of plasma sprayed metals bonded with a polyimide or epoxy adhesive was studied. Metal adherend surfaces were prepared for adhesive bonding by plasma spraying inorganic and polymeric powders on aluminum and titanium. The plasma sprayed materials included Al2O3, AlPO4, MgO, and SiO2 on aluminum; TiO, TiSi2, MgO, and SiO2 on titanium; and polyester, epoxy, bismaleimide, and polyimide on aluminum and titanium. Durability studies used samples prepared in a wedge type durability geometry. Durability was investigated via an environmental cycle that included exposure to the conditions: low temperature -20 deg C (-5 deg F); (160 deg C; 320 deg F) in vacuum (130 torr, 0.2 atm); and room temperature. The crack growth rate for thin coatings (25 micrometers) of Al2O3, AlPO4, SiO2 and MgO plasma sprayed on aluminum was equivalent to that for phosphoric acid anodized aluminum. The performance for titanium samples prepared with a 25 micrometers thick TiO2, TiSi2 and SiO2 plasma sprayed coatings was equivalent to that for a Turco 5578 prepared titanium surface. The systems exhibiting durability comparable to that for adherends treated using the standard solution methods, included aluminum or titanium coated with bismaleimide/cyanate ester (BMI-CE) or a bismaleimide LaRC TPl-1500 mixture bonded with an epoxy or a polyimide adhesive.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1996
- Accession Number
- ADA365477
Entities
People
- John G. Dillard
- Kristy L. Wolfe
- Susan R. Harp
Organizations
- Virginia Tech