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The control of the nucleation density is essential for the production of ultra-thin, continuous and well adhered nanocrystalline diamond coatings. Surface pre-treatments such as abrasive scratching with diamond powder or bias enhanced nucleation are commonly used methods. In this work, surface activation by a pre-growth step is done using the hot-filament chemical vapour deposition (HFCVD) technique...
In plasma-PVD processes, ion bombardment during the growth of thin films has a strong influence on films properties such as morphology, composition, structure, stress, electrical conductivity, and others. Therefore, an accurate control of substrate bias voltage is needed in order to deposit films with the desired properties. For insulator substrates, dc biasing the substrate holder is useless, since...
The deposition of titanium diboride (TiB 2 ) films over tool steel substrates (AISI H13 premium/EN X40 CrMoV 5-1-1) is being investigated due to its excellent corrosion resistance and chemical stability against liquid aluminium. The use of nitrided steels as substrates for TiB 2 deposition may contribute to increase its adhesion and the overall steel resistance in applications such...
Physical–chemical characterization of supported liquid membranes (SLMs), that is, a porous structure containing room temperature ionic liquids (RTILs) was carried out by analyzing XPS and FTIR spectra, while determination of cation transport number from concentration potentials measured with the membranes in contact with NaCl solutions gives transport/electrical information. SLMs filled with two different...
Both satellite Planck and Herschel are cryogenic ones [1,2], the first one having a cold point around 0.1K, the second one around 0.3K. Not only are the detectors cooled, but also major subsystems and systems of the spacecrafts.The Centre Spatial de Liège (CSL) is involved in testing several parts of these spacecrafts [3], starting form optical tests on the mirrors or on the telescope, via cryogenic...
Due to the high sensitivity of Ni–Ti films to environmental changes, e.g. thermal, and/or to stress, they are ideal materials for applications on micro-sensors.It was aimed to obtain Ni–Ti films exhibiting the beginning of the B2⇔R-phase transformation between room temperature (RT) and 0°C. Thus, films with a slightly Ni-rich composition were prepared by sputtering, without intentional heating of...
Thick CVD diamond brazed inserts and PCD cutting tools were compared in dry turning of WC-18wt% Co bars. Machining of hardmetal by chip removal is a recent alternative technology to wheel grinding, aiming the reduction of the operation time, the elimination of cooling lubricants and single step shaping of complex geometries. Two cutting angle configurations were used: i) neutral (0°) rake angle and...
In this paper we present a study of boron-doped nc-Si:H films prepared by PECVD at high deposition pressure (≥4mbar), high plasma power and low substrate temperature (≤200°C) using trimethylboron (TMB) as a dopant gas. The influence of deposition parameters on electrical, structural and optical properties is investigated. We determine the deposition conditions that lead to the formation of p-type...
Titanium dioxide thin films have many interesting properties and are used in various applications. High refractive index of titania makes it attractive for the glass coating industry, where it is used in low-emissivity and antireflective coatings. Magnetron sputtering is the most common deposition technique for large area coatings and a high deposition rate is therefore of obvious interest. It has...
In this work, the lack of adhesion occurred during the up-scaling of the deposition of tribological coatings in a semi-industrial apparatus is interpreted. The adhesion problems were detected for both hard and self-lubricant coatings from W–Ti–N and W:C systems, respectively, when they were deposited in a 4 cathodes TEER ® chamber by reactive unbalanced magnetron sputtering. In spite of cleaning...
In this work, transparent titanium dioxide (TiO 2 ) thin films were deposited onto microscope glass slides by means of the d.c. reactive magnetron sputtering method. The films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), UV–visible spectroscopy (UV) and contact angle analysis using the Owens–Wendt method for the surface energy...
A novel hybrid experimental prototype involving dc magnetron sputtering combined with an ingenious nanocluster source has been developed to deposit nanocomposite coatings by incorporating pre-formed clusters into a sputtered coating under high vacuum conditions. An electromagnetic fuel injector was connected with the nanocluster chamber and then optimised along with the sputtering chamber in order...
Zinc oxide is getting an enormous attention due to its potential applications in a variety of fields such as optoelectronics, spintronics and sensors. The renewed interest in this wide band gap oxide semiconductor relies on its direct high energy gap (E g ∼3.437eV at low temperatures) and large exciton binding energy. However to reach the stage of device production the difficulty to produce...
This paper describes the manufacture of a thin skin-like piezoresistor strain-sensing membrane and the miniaturization of dense piezoresistive sensor arrays based on n-type hydrogenated nanocrystalline silicon thin-films (nc-Si:H) deposited on flexible polyimide substrates (PI). The nc-Si:H thin-films, prepared by hot-wire chemical vapor deposition, have a piezoresistive gauge factor of −32.2.Six...
We have studied the influence of the Al incorporation in the crystalline structure of ZrN thin films deposited by dc magnetron sputtering processes at low temperature. The incorporation of the aluminum in the films depends directly on the Ar/N 2 ratio in the gas mixture and the power applied to the aluminum cathode during the deposition. The chemical composition and the crystalline structure...
We have studied the electronic, structural, and elastic properties of Ti 1−x−y Si x Al y N metastable phase, using first principles calculations based on the density functional theory. These calculations provide the lattice parameter, density of states, cohesive energy, formation energy and elastic constants, when Si and Al atoms replace Ti in the TiN lattice. The calculated...
Transition metal dichalcogenides (TMD) are well known for their self lubricant properties, due to unique crystal structure, with low hardness which makes them inappropriate in applications requiring high load bearing capacity. Nevertheless, there is still a considerable potential for further improvements since other TMDs such as diselenides remain almost unknown. The WSeC coatings were deposited by...
Ti–Si–Al–N films were prepared by rf reactive magnetron sputtering, in static and rotation modes, using a wide range of different deposition conditions, which created conditions to obtain Ti–Al–Si–N coatings with different structural arrangements.Films prepared below a critical nitrogen flow, under conditions out of thermodynamic equilibrium, revealed a preferential growth of an fcc (Ti,Al,Si)N ...
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