An Interdisciplinary Approach to Predictive Modeling of Structural Adhesive Bonding. Characterization of Ti-6Al-4V Oxides and the Adhesive/Oxide Interphase.
Annual rept. no. 86, 18 Jun 84-18 Sep 85,
VIRGINIA TECH CENTER FOR ADHESION SCIENCE BLACKSBURG
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Ti-6-4, being a high strength, lightweight, corrosion resistant alloy, possesses many uses for structural adhesive bonding. Many researchers are therefore finding better pretreatments, characterizing the oxide surface and evaluating bonding performance. The work reported here will encompass both oxide characterization and evaluation of adhesive bonds. The chemical composition of oxides created by specific pretreatments was studied by XPS, AES, SIMS, contact angles, and indicator dyes. The surface topography and structure was probed by SEM, STEM, and profilometry. Following the procedures of Carre and Schultz with aluminum substrates, values for the surface energy of the Ti-6-4 oxides are obtained using an interfacial contact angle method. Because of the present interest in the use of Ti-6-4 for high temperature applications, the thermal stability of the oxide layer was investigated. Following Pikes successful use of inorganic primers as adhesion promoters on aluminum substrates, studies were begun to characterize a titanate primer. Finally, both lap shear and wedge tests have been used to evaluate the adhesiveoxide interphase.
- Adhesives, Seals and Binders
- Industrial Chemistry and Chemical Processing
- Fabrication Metallurgy