Browsing by Keyword "Transmission electron microscopy"
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Item Characterization of nanostructured Ti–B–(N) coatings produced by direct current magnetron sputtering(2007-02-26) López-Cartes, C.; Martínez-Martínez, D.; Sánchez-López, J.C.; Fernández, A.; García-Luis, A.; Brizuela, Marta; Onate, J.I.; TECNOLOGÍAS DE HIDRÓGENO; INGENIERÍA DE SUPERFICIES; Tecnalia Research & InnovationA series of Ti–B–(N) coatings prepared by dc magnetron sputtering using TiB2 targets in Ar/N2 gas mixtures has been chemically and structurally characterized by transmission electron microscopy, X-ray diffraction, electron energy-loss spectroscopy, and X-ray photoelectron spectroscopy. The influence of synthesis parameters such as applied heating power and nitrogen flow on the structure and chemical composition of the coatings has been studied. Independently of the experimental conditions employed during the synthesis, hexagonal TiB2 is the main crystalline phase present in the coatings. The use of N2 leads to the formation of an amorphous mixture of BN/TiN phases, as well as a diminution of the TiB2 crystalline phase. The influence of the composition and structure of the coatings on their hardness is also discussed.Item Microstructural characterisation of copper/carbon nanofibre composites(International Committee on Composite Materials, 2009) Lloyd, J. C.; Barcena, J.; Clegg, W. J.; EXTREMATThe thermal conductivity and microstructure of a CuTi-0.5/CNF composite has been investigated. Microstructural characterisation involved FIB milling coupled with SEM microscopy, to obtain fibre distribution, and TEM microscopy, to study the fibre/matrix interface. From this, predictions of κcomposite were made and compared to measured values.Item Study of thermal conductivity and microstructure of copper-5 wt%titanium/carbon nanofibre composites(2010) Lloyd, J. C.; Barcena, J.; Clegg, W. J.; EXTREMATCarbon nanofibres have high thermal conductivities of approximately 1200 W m-1 K-1, thus have great potential as the high conducting phase in composite materials for use as heat distributors in high heat flux applications. A copper-5wt% titanium/carbon nanofibre composite was fabricated, and its thermal conductivity and microstructure was studied. Microstructural characterisation involved focussed ion beam milling coupled with scanning electron microscopy, to obtain the fibre distribution, and transmission microscopy, to study the fibre/matrix interface. The composite thermal conductivity was determined from laser flash measurements and was found to be much lower than that predicted using the Eshelby mean field approach. A study of the structure showed that this was the result of cracking at the CNF/matrix interface and degradation of the carbon fibre graphitic structure.