Surface Preparation of Ti-6Al-4V for High-Temperature Adhesive Bonding

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Abstract
The role of surface preparation in high-temperature bond durability is investigated for Ti-6Al-4V adherends. Four surface preparations, including a newly-introduced treatment, plasma-sprayed Ti-6Al-4V coatings, are evaluated using a simple tensile test and a wedge/crack-propagation test. At temperatures approaching 300°C, the oxide-metal interface of oxide preparations becomes unstable. Such exposure results in a weakening of the oxide and, hence, bond failure at low tensile strength. The plasma-sprayed coating is a microscopically-rough metallic film with only a thin, native oxide. The plasma-sprayed adherend remains strong over prolonged, high-temperature exposures, and the micro-roughness is important for crack arrest in the wedge test.

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