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Young's modulus measurement and study of the relationship between mechanical properties and microstructure of air plasma sprayed alloy 625.

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Young's modulus of diamond-coated fibres and wires

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DIAM Diamond-coated fibres and wires were produced by hot filament CVD of diamond on variety of core materials incl. W and SiC. Fibres with diamond volume fraction > 95% have been produced. 5 different methods of measuring fibre Young's modulus (a resonance method, bend test and tensile test) are presented, together with results. Applications for such fibres include reinforcements in metal matrix composites.

Young's modulus, hardness and scratch adhesion of nickel phosphorus tungsten multilayered alloy coatings produced by pulse plating

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Effect of layering on Young's modulus, hardness and deformation behaviour of Ni-P-W multilayered alloy coatings in scratch adhesion test was studied. Coatings were deposited on Cu by electrodeposition and wavelengths studied were 8-4000 nm. Young's moduli of amorphous multilayered Ni-P-W coatings, measured by acoustic-wave resonance method, are higher than Young's modulus of crystalline Ni. Hardness increased with decreasing wavelength of coatings, increase being more pronounced for wavelengths < 120 nm. Cohesive load of multilayered coatings ranges from 5 to 16 N, while critical load range for coating detachment in scratch adhesion tests was 50-75 N. Values of adhesive and cohesive loads seem independent from wavelength of Ni-P-W coatings. Failure modes observed in scratch tracks of Ni-P-W multilayered coatings are common in every coating in scratch tests under increasing load, and they are result of substrate deformation and coating brittleness.

Youngs 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.

Youngs Modulus and Stress Intensity Factor Determination of High Velocity Electric Arc Sprayed Metal-Based Ceramic Coatings.

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YSZ Layers by Pulsed-MOCVD on Solid Oxide Fuel Cell Electrodes

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YSZ protective coatings elaborated by MOCVD on nickel-based alloys

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SURF YSZ films were obtained in hot wall MOCVD reactor using zirconium(thd)4 and yttrium(thd)3 as organometallic precursors. Evaporation and deposition temps. were chosen to stabilize cubic phase of zirconia. Coatings were produced on different nickel and chromium alloy substrates.

Yttria coating synthesized by reactive flame spray process using Y-EDTA complex.

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Yttria stabilized zirconia corrosion destabilization followed by Raman mapping.

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Yttria-stabilized zirconia coating with a molten silicate resistant outer layer.

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Turbine engine component with substrate, a yttria-stabilized zirconia coating applied over the substrate, and a molten silicate resistant outer layer. The molten silicate resistant outer layer is formed from gadolinia or gadolinia-stabilized zirconia. A method for forming the coating system of the present invention is described.

Yttria-Stabilized Zirconia Films Grown by Radiofrequency Magnetron Sputtering: Structure, Properties and Residual Stress.

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Yttria-stabilized zirconia thick coatings deposited from aqueous solution in a low pressure plasma reactor.

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Yttria-stabilized zirconia thin films deposited by pulsed-laser deposition and magnetron sputtering.

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Yttrium implantation effects on extra low carbon steel and pure iron

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Extra low C steel and pure electrolytic iron samples were Y implanted using ion implantation technique. Compositions and structures of pure Fe and steel samples were investigated before and after Y implantation.

Yttrium Oxide Based Surface Coating for Semiconductor IC Processing Vacuum Chambers.

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To further enhance the chamber material performance of anodized aluminium alloy materials against fluorine and oxygen plasma attack, a ceramic-based surface coating, high purity yttrium oxide coating, is provided on the anodized aluminium alloy parts.