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Ga Turbine Part Provided with a Protective Coating, and a Method of making a Protective Coating on a Superalloy Metal Substrate.

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Gas turbine part comprises a superalloy metal substrate, a bonding underlayer formed on the substrate and comprising an intermetallic compound of aluminium, nickel, and platinum, and a ceramic outer layer anchored on the alumina film formed on the bonding underlayer. The bonding underlayer essentially comprises a nickel-platinum-aluminium ternary system constituted by an aluminium-enriched alpha-NiPt type structure, in particular an Ni-Pt-Al ternary system having a given composition.

Gadolinium zirconate/YSZ thermal barrier coatings: Mixed-mode interfacial fracture toughness and sintering behavior.

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GaFeAs: a diluted magnetic semiconductor grown by molecular beam epitaxy

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Gage measures anodic or organic coatings

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Description of 'PosiTector 3000' magnetic digital gauge for measuring thickness of anodic oxide coatings and organic coatings on Al and Cu, of DeFelsko Co., Ogdensburg, NY.

Gage R & R Study for Anodic Coatings

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Describes the Gage R & R concept as it relates to anodic coatings. Different biases that can affect the Gage R & R are be discussed and ways to improve the effectiveness of the analysis reviewed. A comparison will be made of the thickness of anodic coatings using Eddy Current instruments and cross sectional analysis. The effect of different alloys as related to coating thickness capability is examined.

Gallium Aluminium Arsenide (GaAlAs) Schottky Directional Coupler Switch

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88 82638 Engl. Describes electroplating of schottky barriers in title material waveguide structures.

Gallium arsenide polishing mechanism with NaOCl solution

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JES GaAs wafer (100) surface was polished with NaOCl soln. Surface analyses were accomplished by Fourier-transform infrared spectroscopy (FT -IR), X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and Raman spectroscopy. Reaction between GaAs and NaOCl produced Ga2O3.As2O3 product. 10 min. soaking in NaOCl soln. caused 420 Angstrom thick reaction as product. GaAs polishing mechanism with NaOCl soln. was proved to have chemomechanical polishing characteristics by which Ga2O3.As2O3 debris can be removed.

Gallium nitride growth by metallorganic vapor phase epitaxy. A comparison of modelling and experimental measurements

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JES.

Gallium Stabilised Electroless Nickel Bath

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Galvalume Strip - Technical Developments

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The corrosion performance of Galvalume (Al-Zn coated) steel is compared with that of hot-dipped zinc or Al. Results of atmospheric exposure for up to 17 years in several climates is plotted with colour photos showing stain/corrosion effects. The effect of dendritic structure on corrosion is plotted. Colour photos show results of immersion tests up to 265 days. Comments on protection of cut edges, performance in various automobile roles, use of painted Galvalume & chromating.

Galvanic and Chemical Deposition of Bismuth Powders from Aqueous Solutions.

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JES

Galvanic anode system for corrosion protection of steel and method for production thereof.

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Galvanic anode system for corrosion protection of steel, comprising a solid electrolyte and galvanic anode material stuck to or embedded in the solid electrolyte, preferably zinc and the alloys thereof. The solid electrolyte is characterised by a high ionic conductivity and preferably contains at least one anionic and/or cationic polyelectrolyte and/or preferably at least one compound which forms complexes with the anode material, preferably with zinc. The solid electrolyte is produced by the application of a coating agent, preferably as an aqueous dispersion or suspension, to the steel or the mineral base which is preferably concrete. The anode material is characterised in forming a galvanic element with the solid electrolyte and the steel for protection, in which steel forms the cathode. Said galvanic anode system is further characterised in that the anode material is preferably applied as a film, net or mesh to the surface of the solid electrolyte, preferably by gluing and/or is embedded in the solid electrolyte.

Galvanic anodes for cathodic protection of reinforced concrete

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(In Swedish, English summary). Compares performance of 3 anodes - thermally sprayed zinc (99.995), thermally sprayed aluminium-zinc-indium alloy (20% Zn, 0.2% In) or glued-on zinc foil with ionically conductive hydrogel. Performance is compared for carbonated and non-carbonated concrete and ranking differs for these two situations.

Galvanic Black Anodising of Magnesium Lithium Alloys

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JAE Parametric study for optimised process incl. effects of annealing. Optimisation of film thickness, microhardness, details of sealing & coating properties are given, incl. adhesion (tape test - MIL-C-81706), optical properties (solar reflectance spectrum), morphology, infra-red reflectance spectra are shown. 10 refs.

Galvanic cell

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Galvanic cell with alkaline electrolyte with Ag2O as potential determining component and with positive electrode coated with Ag layer formed by chemical reducing agent after electrode has been built into cell cup.