Copper-tungsten-nickel wires

In the prepared wires described above, the copper and nickel buttwelds at either end of the tungsten serve to seal up any fine channels that might be present in this metal and to prevent leaks. If the tungsten rod or wire is to be used alone it is sometimes desirable to seal the ends by welding or fusing a coating of nickel over the tip. A fine... 

Copper and nickel were deposited from metal foil wrapped around a hot tungsten filament. Chromium was evaporated from a chrome plated tungsten wire. XPS measurements were made to determine the metal coverage as well as the electronic structure at the interface. The metal coverage was determined by substituting the experimentally measured areas under the XPS curves, core hole cross sections ( ), and electron mean free path in both the metal and the polymer and an instrument response... 

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