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YBaCuO and TlBaCaCuO superconductor thin films via an electrodeposition process

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ECS Thin-film superconductors of YBaCuO (YBCO) and TlBaCaCuO (TBCCO) were fabricated via electrodeposition process. YBCO superconductor precursor thin films were deposited at -2.5 to -4V vs. an Ag/AgNO3 reference electrode. YBCO films were deposited under both constant and pulsed-potential conditions. Post-annealed YBCO films showed zero resistance of c. 74°K on Ni, 78°K on MgO, and 91°K on zirconia substrates. Best critical CDs obtained for YBCO films at 4°K and zero magnetic field and resp. substrates are as follows: 4000 A/sq.cm on [100] zirconia, 3960 A/sq.cm on [100] MgO (constant potential), 5160 A/sq.cm on [100] MgO (pulsed potential), 500 A/sq.cm on nickel strip, 325 A/sq.cm on Ni wire, and 500 A/sq.cm on silver wire. Precursors of superconducting TBCCO films were codeposited at constant potential of -4V and also under pulsed-potential conditions. Post-annealed TBCCO films showed zero resistance at about 102°K on strontium titanate substrate. The critical current density at 76°K of TBCCO film deposited at constant potential on Ag-coated SrTiO3 substrate was 20,000 A/sq.cm in zero magnetic field and 5,000 A/sq.cm in a 10 kOe field parallel to film plane. Critical CD of pulsed-potential deposited TBCCO film on SrTiO3 was 56,000 A/sq.cm at 76°K in zero field.

YBaCuO Superconductor Thin Film Using an Electrodeposition Process

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JES Title films were formed by electrodeposition from a dimethyl sulphoxide solution of the nitrates of salts (Y(III), Ba(II), Cu(II)) followed by annealing. 14 refs.

YBCO films on nickel substrates prepared by spraying a suspension

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Y1Ba2Cu3O(x) films c. 50-60µm thick on Ni substrates were fabricated by spraying suspension consisting of YBCO powders. Films were fired under flowing Ar and annealed in O2 showed relatively high J(c) values of c. 500 A/sq.cm (77 K, 0T) over firing temp. 910- 950°C. When films were fired at 960°C, Ni whose concn. c. 4 at.% and large-size cracks were found on surface, resulting in destruction of superconducting properties.

Yellow and orange colours on aluminium

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Al (alloy) is anodized, pretreated in conc. H3PO4 using ac and coloured in electrolytic bath containing SeO2 or alkaline selenite using ac at 8-20 V.

Yellow chromate conversion coating over acid chloride zinc plating

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Adhesion of chromates, but esp. yellow, to title zinc coating can be poor, and sometimes erratic as a problem. The problem is sometimes known as "chromate slough-off". A troubleshooting approach is provided.

Yellow chromate conversion coating over acid chloride zinc plating

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Adhesion of chromates, but esp. yellow, to title zinc coating can be poor, and sometimes erratic as a problem. The problem is sometimes known as "chromate slough-off". A troubleshooting approach is provided.

Yellow Chromate Conversion Coatings on Zinc: Chemical Composition & Kinetics

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Title coating is shown, using EDAX & precipitation titrations, to be a basic zinc chromate. Kinetic data (rate) of Zn dissol'n in various sol'ns is shown & coating growth-rate plots presented. Data is interpreted in terms of a rate equ'n. SEM photos are shown. Bath management is discussed.

Yellow smoke-free chemical polishing for brass parts.

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Yellow-fume-free chemical polishing agent for 215 aluminium parts.

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Yield inception of a soft coating on a flat substrate indented by a rigid sphere.

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Yolk–shell Au@CeO2 microspheres: Synthesis and application in the photocatalytic degradation of methylene blue dye.

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You can manage that finishing shop

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No ISBN. Chapters: 1. Communications Techniques. 2. Costs & cost problems 3. Engineering problems. 4. production flow; 5. Labor 6. Methods & procedures. 7 Time management. 8 Sel-training & education. 9. When you take over 10. The personal computer as helper. The book is addressed to foreman level, and, apart from "housekeeping" problems (maintaining exhaust ventilation etc) is management rather than technical.

You're not too small to recycle your wastes

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Discusses use of commercially available small solvent recovery units.

Young modulus and fracture toughness determination of high velocity oxy-fuel-sprayed bioceramic coatings

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SURF Indentation tests along with three- and four-point bend tests were utilized for the determination of Youngs modulus (E) of high velocity oxy-fuel (HVOF) sprayed hydroxyapatite (HA) and HA/titania (TIO2) coating. In addition, fracture toughness (Kic) and strain energy release rates (G) with reference to the coating/substrate interface were investigated using the indentation technique and four-point bend test, respectively. Results showed that the E values of the bioceramic coatings were significantly dependent upon microstructure and phase composition. The incorporation of titania (10 and 20 vol.%) as reinforcements, which had higher stiffness than HA, was found to effectively improve the overall E values and facture toughness of the composite coatings. It was revealed that the splats' interface played a substantial role in determining the fracture toughness on the assumption that cracks propagated predominantly along the interface. The present study claimed that the indentation test was essentially a local-phase-dependent method and was markedly influenced by surface roughness of the samples. The three- and four-point bend tests were found to be relatively more reliable for the evaluation of overall bulk property of the coating. And typical E values obtained from the three-point bend test were notably close to those obtained from the four-point bend test. It was found that the four-point bend test was not suitable for the determination of fracture energy at the coating/substrate interface due to the poor cohesion of the bioceramic coatings.

Young modulus and Poisson ratio measurements of TiO2 thin films deposited with Atomic Layer Deposition.

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