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Joining by plating: optimisation of occluded angle

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Develops author's ideas on adhesive bonding by electroplating. Emprical method for predicting minimum angle necessary for max. joint strength is derived. Experimental results are given for aluminium to nickel, AM363 to Ni, and joint strengths are predicted for the above & uranium titanium to Ni and beryllium. Details of ring shear & tension test methods for adhesion. Detailed engineering drawings of joints, graphs show performance, & theory vs. results. 5 refs

Joining mechanism between Al2O3-Ag-Cu-Ti composite coating and GCr15 substrate.

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SURF Using a mixture of Al2O3, Ag, Cu, and Ti particles, an Al2O3-Ag-Cu-Ti composite coating was fabricated on GCr15 substrate by plasma spraying. To obtain strong joining between the composite coating and substrate, samples were heated at 700-1000 °C for 10 min in a vacuum chamber. The microstructure and composition of the coating were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). SEM images revealed that the shapes of the Ag and Cu particles in the coating changed because of a eutectic reaction when the joining temperature exceeded 800 °C. SEM and XRD results showed that a thin TiC and Ti2Fe composite layer was formed at or close to the interface when the joining temperature was above 900 °C. In addition, an obvious reaction layer with a concentration of elemental Ti between the Ag-Cu-Ti alloy and the Al2O3 particle was formed when the joining temperature exceeded 800 °C. Evaluation of the mechanical properties of the join between the composite coating and the substrate was performed using an impact tester, and the sample joined at 900 °C showed excellent adhesion strength and toughness.

Joining metal foil with foil of synthetic material

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Adhesive bonding for joining foils of metals and of synthetic material by unwinding both foils from supply rolls; applying light curing adhesive to min. 1 foil, pressing and forming composite foil and irradiating with light to cause polymerization.

Joining Method for Galvanised Steel Sheet

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Joining of arc sprayed coating to substrate by compound casting.

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Joining of ceramics to metals. I. Interfacial reactions between ceramics and metals.

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Metallographic approach to chemical bonding incl. ferrous alloys & non-ferrous alloys incl. aluminium & nickel. Ceramics include alumina, zirconia, silicon nitride & carbide.

Joining of passive dissimilar metals: an emerging application of electrodeposition

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Electroless nickel after electroplated nickel were used to plate, then join the KW metals. Sketches show equipment and join geometry and deposition sequences. Data gives UTS (ultimate strength) for plated joints & photos show examples. Tables show how variation in dep'n conditions (e.g agitation) affect joint strength. Uses in aerospace & nuclear industries are noted. 14 refs

Joining of Silicon Nitride using Coating Technology.

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Joining Titanium or Tantalum with Copper or Iron.

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After being chem. cleaned or vapor blasted, Ti or Ta foils are subjected to ion bombardment and then coated with Cu or Fe by cathodic sputtering at >500°C. The approx. 1µm thickness of the initial bonded layer is then increased to approx. 1 mm, preferably by electrodeposition. The resulting composites show superior bond strength as well as good elec. and thermal cond.

Joint effect of halides and ethanol extract of Lasianthera Africana on inhibition of corrosion of mild steel in H2SO4.

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JAE

Joint Effect of Oxidants and Zinc-Phosphate Solution on Protective Properties of Conversion Coating

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Joint effects of oxidants & zinc phosphating solution on the corrosion resistance of a conversion coating

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PROT That corrosion resistance of Zn phosphate is improved by additions of cobalt is explained in terms of acid Zn phosphate anions, formed during phosphating, being desorbed. This allows accelerated deposition of Zn3(PO4) and Zn2Co(PO4)2. The nucleation process is also improved and finer-grained phosphate coatings are formed, these having greater corrosion resistance. The same effects can be observed even without Co additions when the surface is first treated in an oxidising solution. 5% chromium trioxide, 5% potassium permanganate or 0.1% hydrogen peroxide are recommended.

Joint effort - paint overspray recovery in-house and externally

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Two-stage paint recovery with belt system in the spray booth for primary recovery, and that not so captured being returned to the paint manufacturer for reprocessing. Sketch shows in-house arrangement. Pie-charts show very low solvent content of water-based and dramatic reduction of VOC emissions following switch to water-based and installation of the various recovery measures. Comments on the benefits, incl. drastic reduction in paint sludge volume.

Joint Extraction-Photometric Determination of Molybdenum and Copper in Molybdenum Concentrates.

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Joint progress report: IONMET & SurfEnergy

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Report on two jointly-held meetings. IONMET is a Multi-partner project on electrodeposition and related topics, using ionic liquids. Progress on hard chromium plating, electropolishing. immersion silver (displacement), barrel plating & copper & aluminium plating is summarised, as is a Q & A session that concluded the meeting. SurfEnergy is a project seeking to reduce the energy input for surface finishing processes. Various "Toolkits" for benchmarking & measuring energy use were detailed, the uses of life cycle analysis were also noted. 2 refs