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Coated articles, electrodeposition baths, and related systems

Inactive Publication Date: 2012-05-17
XTALIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]Other aspects, embodiments, and features of the invention will become apparent from the following detailed description when considered in conjunction with the accompanying drawings. The accompanying figures are schematic and are not intended to be drawn to scale. For purposes of clarity, not every component is labeled in every figure, nor is every com

Problems solved by technology

In some applications, a coating may at least partially wear off as a result of repeated rubbing against a surface.
Such an effect may be undesirable, es

Method used

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  • Coated articles, electrodeposition baths, and related systems
  • Coated articles, electrodeposition baths, and related systems
  • Coated articles, electrodeposition baths, and related systems

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0088]This example demonstrates coating thickness, tungsten content, grain size, coating hardness, and contact resistance achieved with various samples.

[0089]Coatings were electrodeposited on base materials in aqueous electrodeposition baths using an electrodeposition process. The electrodeposition baths contained a silver ionic species, a tungsten ionic species, and a complexing agent. The coatings were formed directly on the base material substrate. Additionally, for samples 28-35, a nickel layer was electrodeposited on the substrate prior to electrodepositing the silver-based alloy.

[0090]Tables 1 and 2 show the results obtained for these coatings.

TABLE 1Thickness, tungsten content, grain size and hardness for various samples.ThicknessTungstenGrainHardnessSample(microns)(atomic %)Size (nm)(GPa)12.91.0222.423.11.520N.D.33.41.415N.D.43.81.7142.453.77.9 52.263.87.7 52.174.27.1 6N.D.84.16.4 71.69N.D.1.2N.D.N.D.103.11.2962.1114.51.6N.D.N.D.124.51.349N.D.139.81.4552.6147.51.449N.D.156.4...

example 2

[0091]This example demonstrates coating wear durability for a material which comprises a lubricant layer.

[0092]A silver-tungsten alloy was electrodeposited as described above in Example 1, on two round surfaces and two flat surfaces. The alloy comprised about 5 wt % tungsten and the thickness of the coating was about 80 microinches. The hardness of the coating was about 2.0-2.5 GPa. Following electrodeposition, a lubricant was formed on one of the round surfaces and one of the flat surfaces using simple dip application methods known to those in the art. In this example, the lubricant was Evabrite™. Wear durability studies were conducting as follows: a coated round surface was placed in contact with a coated flat surface; the flat and round surfaces were then worn against each other through a linear reciprocating motion As shown in FIG. 3, the article which did not include the lubricant layer (FIG. 3A) showed significant wear-through after 25 cycles while the article which included t...

example 3

[0093]This example demonstrates changes in the porosity of an electrodeposited coating comprising a silver alloy having varying weight percentages of tungsten.

[0094]FIGS. 4A-4C show scanning electron micrographs of cross sections of silver-tungsten alloys electrodeposited according to the methods described in Example 1, comprising A) 2.3 wt %, B) 4.5 wt %, and C) 8.7 wt %. FIG. 4D shows a plot of the porosity versus wt % of tungsten for electrodeposited silver-tungsten alloys, according to some embodiments.

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Abstract

Coated articles, electrodeposition baths, and related systems are described. The article may include a base material and a coating comprising silver formed thereon. In some embodiments, the coating comprises a silver-based alloy, such as a silver-tungsten alloy. The coating can exhibit desirable properties and characteristics such as durability (e.g., wear), hardness, corrosion resistance, and high conductivity, which may be beneficial, for example, in electrical and/or electronic applications. In some cases, the coating may be applied using an electrodeposition process.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. application Ser. No. 12 / 723,020, filed Mar. 12, 2010 and U.S. application Ser. No. 12 / 723,044, filed Mar. 12, 2010, which are incorporated herein by reference in their entirety.FIELD OF INVENTION[0002]The present invention generally relates to coated articles, electrodeposition baths, and related systems. In some embodiments, the coatings are metallic and are electrodeposited.BACKGROUND OF INVENTION[0003]Many types of coatings may be applied on a base material. Electrodeposition is a common technique for depositing such coatings. Electrodeposition generally involves applying a voltage to a base material placed in an electrodeposition bath to reduce metal ionic species within the bath which deposit on the base material in the form of a metal, or metal alloy, coating. The voltage may be applied between an anode and a cathode using a power supply. At least one of the anode or cathode may serve as the base mate...

Claims

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Application Information

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IPC IPC(8): C25D3/64C25B9/00
CPCC25D3/64C22C5/06
Inventor DADVAND, NAZILAD'URSO, JOHNTRENKLE, JONATHAN C.LUND, ALAN C.CAHALEN, JOHN
Owner XTALIC CORP