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Nanoscale Structural Characterization at the Titanium/Sol-Gel/Primer/PETI-5 Interface

Published online by Cambridge University Press:  02 July 2020

James D. Holbery  and
Robert M. Fisher
James D. Holbery
Affiliation:
Materials Science and Engineering, University of Washington, Seattle, WA98195, USA
Robert M. Fisher
Affiliation:
Materials Science and Engineering, University of Washington, Seattle, WA98195, USA
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Extract

Characteristics of the interfacial region between a polymer and substrate are critical to the durability of adhesive-adherend system performance. The High Speed Civil Transport (HSCT) requires structural laminates to be light weight, non-corrosive, environmentally safe, and able to withstand extreme service conditions (Mach 2.4 with in-service temperatures at 177°C, projected life to 120,000 hours). The present work characterizes multi-layer laminates comprised of a Titanium substrate (6A1-4V and 15V-3Cr-3Al-3Sn alloy), a silicate/zirconate sol-gel coating with aminopropyl functionality (nominally 1000 Angstroms), a NASA developed PETI-5 psuedothermoplastic polyimide primer (nominally 1000 Angstroms), and a high toughness, thermo-oxide stable PETI-5 adhesive. Previous studies report the physical effect of aging; therefore, this work aims to measure the nano-mechanical properties of the interface utilizing nano-indentation and AFM, focusing on the accelerated time-dependent changes due to extreme environmental exposure.

Samples were prepared by sectioning each laminate (No Environmental Exposure, 1000 and 2000 Hours at 200°C) in two locations, one section externally exposed to environmental test conditions and the other from the middle of the laminate.

Type
Future of Microscopy: Ceramics, Composites, and Cement
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 774 - 775
Copyright
Copyright © Microscopy Society of America

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References

1. Daghyani, H.R., et al., J. Mat. Sci. 31, (1996) 2523–2529.CrossRefGoogle Scholar

2. Parvatareddy, H., et al., J. Ad. Sci. Tech., 12, (1998) 615–627.CrossRefGoogle Scholar

3. We gratefully acknowledge the Boeing Co./NASA for their support within the NASA 1-20220 HSCT Adhesive Development Program.Google Scholar