Browsing by Author "Endrino Armenteros, Jose"

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    Broad band anti-reflection 2-16μm coatings on diamond and ZnSe.
    (2018-08) Hakim Khalili, Mohammad; Endrino Armenteros, Jose
    In this project, Thin Metal Films an optical coating company is requiring the upgrade of a desktop research type radio frequency magnetron sputtering machine which was custom made for a European funded project and was gifted to it after the project completion. As the machine had no usage history, it had to be investigated and its capabilities and characteristics identified. The first part of the project, focused on restoring the machine using a systematic approach by utilising a technique called Plan Do Check Act, where a continuous feedback loop is used to identify problems and finding solution to them. Within the restoration process the aim was to improve the coating uniformity and machine’s repeatability. The restoration of the machine consumed almost the entire project duration leaving a little time for second part of the project. The second part was to use the restored machine, to develop single and multilayer Broad Band Anti-Reflective Coatings for Zinc Selenide and diamond optics. The optics are to be used in Attenuated Total Reflectance accessory units for Infrared spectroscopy. Based on the literature review and multiple decision criteria, yttria and ytterbia were showing promising results in adhering very well to a diamond surface and improving its transmission. Therefore, using Macleod software, a single layer quarter wavelength coating was designed and theoretically examined. It was found that a quarter wavelength ytteria at 5000 nm and a quarter wavelength ytterbia at 3370 nm can increase the transmission on both ZnSe and diamond optics to maximum of 98% and 95% accordingly. The coatings have not actually been deposited on the optics due to both targets breaking before conducting the actual experiments.
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    Data for the paper "UV Treatment of Flexible Copper Nanowire Mesh Films for Transparent Conductor Applications"
    (Cranfield University, 2017-11-01 10:07) Lonne, Quentin; Endrino Armenteros, Jose; Huang, Zhaorong
    Data used in the accompanying paper.
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    Stack drilling of CFRPT/TI using coated and uncoated tools.
    (2018-08) Mughal, Bilal; Endrino Armenteros, Jose; Goel, Saurav
    The aerospace industry is increasingly utilising composite-metal stacks due to their superior mechanical properties and variable physical functions. Energy saving and increased strength/weight ratio are the two main factors why manufacturers are replacing separate composites and metal alloys with the hybrid stacks. These stacks are drilled and joined together with mechanical fasteners such as rivets. Single-shot drilling is a relatively new method and allows for time and cost reduction. But, because of the disparate nature of materials, drilling them at the same time poses great manufacturing challenges. Tool wear, increased temperature and poor machining quality are some of the issues encountered. This study investigated the performance of tools coated with diamond-like carbon (DLC) and boron-aluminium-magnesium (BAM) coatings which were deposited using physical vapour deposition (PVD) method. Drilling experiments were carried out on CFRP/Ti stacks and tool wear and hole quality were assessed. Tool wear results showed that DLC 1 tool had the best performance, showing the least wear. For BAM coatings, higher thickness caused the tools to fail earlier than DLC and BAM 1 tools. Uncoated tool failed after 25 holes. Overall coated tools DLC 1 and BAM 1 showed best performance.
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    Structure zone diagram and particle incorporation of nickel brush plated composite coatings
    (Nature Publishing Group, 2017-03-16) Isern, Luis; Impey, Susan A.; Almond, Heather; Clouser, S. J.; Endrino Armenteros, Jose
    This work studies the deposition of aluminium-incorporated nickel coatings by brush electroplating, focusing on the electroplating setup and processing parameters. The setup was optimised in order to increase the volume of particle incorporation. The optimised design focused on increasing the plating solution flow to avoid sedimentation, and as a result the particle transport experienced a three-fold increase when compared with the traditional setup. The influence of bath load, current density and the brush material used was investigated. Both current density and brush material have a significant impact on the morphology and composition of the coatings. Higher current densities and non-abrasive brushes produce rough, particle-rich samples. Different combinations of these two parameters influence the surface characteristics differently, as illustrated in a Structure Zone Diagram. Finally, surfaces featuring crevices and peaks incorporate between 3.5 and 20 times more particles than smoother coatings. The presence of such features has been quantified using average surface roughness Ra and Abbott-Firestone curves. The combination of optimised setup and rough surface increased the particle content of the composite to 28 at.%.