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Nanometer thick oxygen diffusion barrier coatings on PET plastic film were deposited. Fick's Law is set out to explain rate of oxygen diffusion. Graph plots diffusion rate showing lag time or induction period. Histos show permeability (porosity) for single & duplex coatings, sketches show idealised diffusion mechanism. Barrier efficacy for water vapour and oxygen can be up to x2000 and x650 resp. 11 refs.
Ultra-black coating with extremely high light absorption capacity is produced on metal, ceramic, glass or plastic, blackness being associated with unique surface morphology consisting of dense array of microscopic pores etched into surface, as well as resulting coated substrate. Substrate is pretreated and plated in Ni bath containing hypophosphite, washed and dried, etched in soln. of HNO3 in dist. or deionised water until coating develops ultra-blackness, washed and dried. Surface has spectral reflectivity of 0.5-1.0% at wavelength of light 320-2,140 nm and finds use in solar energy applications.
Ultra-black coating with spectral reflectance 0.5-1.0% at wavelength of 320-2140 nm, associated with unique surface morphology consisting of dense array of micropores etched into surface, is prepared by (a) preparing metal, ceramic, glass or plastic surface for Ni-P plating, (b) electrolessly plating in bath at pH 3.5-6.5, 50-100°C, containing Ni and hypophosphite ions, for 1/4-2 h to deposit coating containing 3.7-12.2% wt. P,(c) washing and drying, (d) immersing in bath containing water 1,con. HNO3 3 pts., at c.50°C for 5-15 s, to developultra-blackness, (e) washing and drying.
Ultra-Bright Passivated Aluminium Nano-Flake Pigments.
Organic release agent is vacuum deposited onto substrate, then plasma or ion-beam treated to harden a very thin surface layer. Al is then vacuum deposited to form a flat and specular thin film. This is then exposed to oxygen or nitrogen to passivate the surface. The film is parted from the substrate, then crushed to form Al flakes, treated with solvent to remove soluble components. This greatly reduces wrinkles and improves optical properties of flakes while passivation virtually eliminates subsequent corrosion.
Ultra-clean electropolished tubes from Sweden
Electropolishing of stainless steel tubes at AB Calamo, Box 46, 660 69 Molkom, Sweden, is described.
Ultra-durable powder coatings for motor vehicle applications
Durability of proprietary powder coating is presented with results of gloss retention in natural weathering (Florida) and post-exposure testing (impact resistance and humidity resistance).
Ultra-Fine Ceramic Coatings Containing Nano-Size Nickel Particles.
SURF In order to improve the oxidation and wear resistance of superalloy GH202, the ultra-fine ceramic coating containing nano-size nickel particles was obtained by flow coat method. The effect of nano-size nickel particles on the coating-substrate was investigated through oxidation kinetics experiment and wear resistance test. The morphology of the specimens was examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the ultra-fine ceramic coating has notable effect preventing GH202 from high temperature oxidation. The anti-oxidation and wear resistance of the coating were improved significantly by adding nano-size nickel particles, and the best coating components is found to be containing 10% (mass fraction) nano-size nickel particles.
Ultra-fine gauge wire
Describes ultra-fine gauge (2 to 150µm) wire of copper or to ther metals, which is glass coated and used in electronic or magnetic devices.
Ultra-hard cutting tool components.
Tool component comprising a cemented carbide substrate and a layer of ultra-hard material bonded to a surface of the substrate through an intermediate layer, the layer of ultra-hard material having a thickness of no greater than 0.2 mm and having a working surface which presents a cutting region and the intermediate layer being made of a material softer than the ultra-hard layer. The ultra-hard material is preferably PCD or PCBN.
Ultra-Hard Low Friction Coating Based on AlMgB14 for Reduced Wear of MEMS and Other Tribological Components and System.
Instead of nickel, copper or iron layers formed by LIGA process, superhard self-lubricated title ternary boride coating can be formed by pulsed laser deposition at hardness values up to 52GPa with friction coefficients as low as 0.04. Films may be amorphous or perhaps with icosahedral framework, from FTIR data.
Ultra-Hard Semiconductive Polycrystalline Diamond.
Formed by sintering of diamond grid feedstock.
Ultra-hard Ti-B-N coatings obtained by magnetron sputtering
SURF Ti boronitride coatings were deposited by reactive magnetron cosputtering. Ti and TiB2 targets were sputtered using Ar-nitrogen gas mixture. Deposition configuration allowed composition gradient along substrate length. Zone explored inTi-B-N diagram shows very different behaviour with chemical composition. Coatings 10 m thick with 6000 HV hardness exhibit wear rates 9 times lower than those of titanium nitride coatings.
Ultra-high molecular weight polyethylene composite for PCB and antenna base material
Base material for printed circuit board and antenna production comprises dielectric layer incl. ultra-high mol. wt polyethylene composite(s) intimately bonded to electroconductive layer(s).
Ultra-high pressure water jet technology - new developments for enhanced corrosion resistance
Colour photos show remotely-controlled magnetic crawler used to clean large storage tanks, ship's hulls, pipelines etc. Pressures up to 1200 bar are used, crawler is kept some 5mm distant from surface being cleaned. Case studies of old coatings stripped and rust scale removed, are given
Ultra-high pressure water jetting of hazardous coatings on galvanised communication towers
Project to recoat naval very low frequency transmitting antenna system is described incl. selection of coating removal, project specifications, water jetting preparation, production factors and rates, and environmental as well as worker protection issues. Existing coatings on structures contain lead, chromium and polychlorinated diphenyls. Use of ultra-high pressure water jetting was acceptable means of coating removal but collection of process water on elevated portions was more difficult than expected.