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Untitled - Materials Science Institute of Madrid - Consejo Superior de ...

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20. Estudio <strong>de</strong> las propieda<strong>de</strong>s mecánicas<br />

<strong>de</strong> capas <strong>de</strong>lgadas mediante técnicas <strong>de</strong><br />

nanoin<strong>de</strong>ntación<br />

La nanoin<strong>de</strong>ntación es una técnica relativamente novedosa<br />

que amplía notablemente las posibilida<strong>de</strong>s <strong>de</strong> los<br />

ensayos <strong>de</strong> dureza tradicionales. Desarrollada en las<br />

dos últimas décadas, la técnica emplea instrumentación<br />

electrónica <strong>de</strong> muy alta precisión para ejercer un control<br />

continuo <strong>de</strong> la carga aplicada al in<strong>de</strong>ntador (en<br />

rango <strong>de</strong> mili-newtons) y, al mismo tiempo, registrar<br />

también <strong>de</strong> manera continua el <strong>de</strong>splazamiento <strong>de</strong>l<br />

mismo <strong>de</strong>ntro <strong>de</strong> la muestra analizada. Debido a la<br />

riqueza <strong>de</strong> información que, sobre la muestra, contienen<br />

los datos <strong>de</strong> carga vs. <strong>de</strong>splazamiento ha sido posible<br />

implementar un amplio número <strong>de</strong> métodos y técnicas<br />

para caracterizar gran número <strong>de</strong> propieda<strong>de</strong>s<br />

mecánicas. Entre otras: dureza, módulo elástico, resistencia<br />

a la fractura (fracture toughness), límite elástico<br />

(yield stress), endurecimiento por <strong>de</strong>formación (strainhar<strong>de</strong>ning),<br />

fluencia (creep), etc. La técnica, puesta a<br />

punto recientemente en el laboratorio, ha sido utilizado<br />

en el estudio <strong>de</strong> un amplio rango <strong>de</strong> materiales, fundamentalmente<br />

en forma <strong>de</strong> capa <strong>de</strong>lgada (DLC, nitruros<br />

metálicos, polímeros, etc)<br />

20. Study <strong>of</strong> the mechanical properties <strong>of</strong><br />

thin film by nanoin<strong>de</strong>ntation techniques<br />

Nanoin<strong>de</strong>ntation is a relatively new technique which<br />

wi<strong>de</strong>ns the possibilities <strong>of</strong> traditional hardness tests.<br />

Developed in the last <strong>de</strong>ca<strong>de</strong>s, the technique uses high<br />

precision electronic instrumentation to control the<br />

small loads (in the mili-Newton range) applied to the<br />

in<strong>de</strong>nter and, at the same time, to record continuously<br />

the displacement (<strong>de</strong>pth) on the analysed sample. Due<br />

to the wealth <strong>of</strong> information provi<strong>de</strong>d by the load vs<br />

displacement curves, it is possible to implement a wi<strong>de</strong><br />

number <strong>of</strong> methods and techniques to characterize a<br />

wi<strong>de</strong> range <strong>of</strong> mechanical properties, such as har<strong>de</strong>ness,<br />

elastic modulus, fracture toughness, yield stress,<br />

strain har<strong>de</strong>ning, creep, etc. The technique, recently<br />

mounted and set-up in the laboratory, has been used in<br />

the study <strong>of</strong> a wi<strong>de</strong> range <strong>of</strong> materials, mostly as thin<br />

films (DLC, metallic nitri<strong>de</strong>s, polymers, etc)<br />

1. Caretti I.; Jiménez I.; Gago R.; Cáceres D., Abendroth B.; . Albella J. M: Tribological Properties <strong>of</strong> Ternary BCN Films with Controlled<br />

Composition and Bonding Structure”. Diamond and Related <strong>Materials</strong>, 13 (2004) 1532-1537.<br />

Proyectos: Proyecto V PM <strong>de</strong> la CE, ref. no.: 65RD-CT-2000-00333.<br />

138

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