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https://hdl.handle.net/10316/103378
Title: | Development of Actuators for Repairing Cracks by Coating W Wires with Reactive Multilayers | Authors: | Silva, Gabriel Santos Maj, Lukasz Morgiel, Jerzy Vieira, Maria Teresa Ramos, Ana Sofia |
Keywords: | multilayer thin films; sputtering; TEM (transmission electron microscopy); self-propagating reactions; liquid phase actuators | Issue Date: | 24-Jan-2022 | Project: | PTDC/CTM-CTM/29101/2017 POCI- 01-0145-FEDER-029101 info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB/00285/2020 PTDC/CTM-CTM/31579/2017 |
Serial title, monograph or event: | Materials | Volume: | 15 | Issue: | 3 | Abstract: | The aim of this research work was to optimize the coating of tungsten wires with reactive multilayer thin films and promote an exothermic self-propagating reaction. The ultimate goal is to use this heat to liquify low melting temperature materials, and thus block crack propagation in metallic materials. Ni/Me (Me = Al, Ti) multilayers were deposited by a DC (direct current) magnetron sputtering onto tungsten wires with diameters of 0.05 and 0.20 mm. The depositions were carried out to obtain films with near equiatomic average chemical composition and a modulation period (bilayer thickness) between 20 and 50 nm. The cross-section of the films was analyzed using electron microscopy before and after electrical ignition. A new substrate holder was developed to improve the quality of the Al/Ni films, allowing a reduction in the defects previously observed. The Ni/Ti thin films showed no discernible defects, regardless of the substrate holder. However, after ignition, the Ni + Ti reaction occurred in a non-self-propagating mode. Passing an electric current through a wire (ϕ = 0.05 mm) coated with an Al/Ni thin film, promoted a flash of light that was associated with the start of a self-propagating reaction. The reaction product was a B2-AlNi intermetallic phase. W wires coated with reactive multilayers may contribute to crack filling, and have potential to be self-healing actuators. | URI: | https://hdl.handle.net/10316/103378 | ISSN: | 1996-1944 | DOI: | 10.3390/ma15030869 | Rights: | openAccess |
Appears in Collections: | I&D CEMMPRE - Artigos em Revistas Internacionais |
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Development-of-Actuators-for-Repairing-Cracks-by-Coating-W-Wires-with-Reactive-MultilayersMaterials.pdf | 6.34 MB | Adobe PDF | View/Open |
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