OPTIMISATION OF MECHANICAL PROPERTIES OF NANOLAMINATE COATINGS
| Authors | |
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| Year of publication | 2015 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | Recently, there has been an increased interest in boron and carbon based films with X2BC composition. Theoretical ab-initio models predict unusual combination of high stiffness and moderate ductility for these types of films when X=Ta, Mo or W. The aim of the present work was to prepare thin Mo2BC films at different deposition temperatures using magnetron sputtering technique and to evaluate the dependence of their mechanical properties on the deposition parameters. The film structure and composition were studied using X-ray diffraction technique, XPS and Ruthefor Backscattered Spectroscopy combined with Elastic Recoil Detection Analysis. The microstructure of layers was studied using a Tescan LYRA 3XMU SEM×FIB scanning electron microscope (SEM), a Philips CM12 STEM transmission electron microscope (TEM) and a JEOL 2100F high resolution TEM. The quasistatic and dynamic nanoindentation response of the films was studied using wide range of testing conditions. The friction coefficient, sratch and wear resistance of the coatings were studied using nanoscratch and nanowear tests. The fracture toughness of the coatings was evaluated using nano and microindentation techniques. The modulus mapping capability was applied to obtain quantitative maps of the storage and loss stiffness and the storage and loss modulus. The modulus mapping combines the in-situ imaging capabilities with the ability to perform nanodynamic mechanical analysis. In Fig. 1 an example of the modulus mapping results obtained on nanocomposite MoBC coating is shown. The Czech Science Foundation is acknowledged for the financial support of this work (Project 15-17875S). |
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