Abstract
Ag–W two-phase system was prepared by electrodeposition using anhydrous 1-ethyl-3-methylimidazolium chloride [EMIm]Cl ionic-liquid (IL) solution with AlCl3 in different ratios. The deposition took place outside the glove box with a continuous Ar stream over the electrolyte at 120 °C and a pulsed-like current regime. Resultant layers show areas of Ag and W with an overall W content with a mass fraction of w W = 50% (mole fraction x W = 36.9%). The phase composition of Ag–W layers was observed by X-ray diffraction, and the chemical composition was characterized by scanning electron microscopy and inductively coupled plasma optical emission spectroscopy.
Highlights
The industrial manufacturing process predominantly used for contact materials made of Ag–W is the impregnation of sintered porous tungsten bodies infiltrated with liquid silver
Since the sintered materials consist of 2-phase systems due to the immiscibility of Ag and W, the electrodeposition of an alloy or a comparable layer would be advantageous, especially since Ag–W contact materials are manufactured in a cost-intensive process
If we look at the deposition of an Ag–W layer from our our systems ([EMIm]Cl:AlCl3 ), the ionic liquids (ILs) should not be too Lewis-acidic as no Al deposition can take place, systems
Summary
The industrial manufacturing process predominantly used for contact materials made of Ag–W is the impregnation of sintered porous tungsten bodies infiltrated with liquid silver. Are produced by powder metallurgy as solid impregnation material by sintering [1] In electrical contacts, these materials are used as burn-off contacts for circuit breakers and as contacts for molded case circuit breakers. When used as power electronics for the automotive industry, the production costs of the components are of critical importance This means that a significantly cheaper electroplating process of a thin layer is preferable to the powder metallurgical manufacturing process of a solid component. After pre-sintering below the silver melting point, the pores of the solid sintered framework are filled up by impregnation with liquid silver in an additional step This means that the workpiece must always be manufactured as a whole part. Such a coating could provide high chemical resistance to reactions at high temperatures, abrasion resistance, and hardness
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