The Durability of Epoxy Adhesive Bonds Formed with Titanium Alloy
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AERONAUTICAL AND MARITIME RESEARCH LAB
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The durability of adhesive bonds formed between titanium alloy Ti-6A1-4V and rubber toughened epoxy structural adhesives used for repair bonding applications was examined. Two surface treatments were studied the grit-blast and silane method, currently employed for titanium repairs on F-111 at RAAF Amberley and the FA-18 SRM method which uses Pasa-Jell 107, a proprietary based toxic chemical treatment Results from wedge style durability tests indicated the grit-blast and silane pre-treatment provided notably better performance than the Pasa-Jell 107 pre-treatment for epoxy bonds formed with Ti-6A1AV alloy. Addition of BR127 primer to the pre-treated surfaces did not offer substantial improvement in durability performance. The durability of titanium-epoxy adhesive bonds for the grit-blast and silane pre-treatment on titanium was inferior to the performance observed on aluminum alloys. Further research will be required to improve the performance of the grit-blast and silane treatment on titanium to levels observed for aluminium.
- Attack and Fighter Aircraft
- Adhesives, Seals and Binders
- Couplers, Fasteners and Joints