Method for improving electrical conductivity of metals, metal alloys and metal oxides

a technology applied in the field of metal alloys and metal oxides, can solve the problems of high cost of fabricating electrical devices incorporating these materials, high cost of materials employed, and time-consuming steps required to plate the substrate, so as to improve the quality of the treated surface, prevent substrate degradation and deformation, and enhance the electrical conductivity of metals

Inactive Publication Date: 2005-12-01
WILSON GREATBATCH LTD
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Benefits of technology

[0005] It would therefore, be highly desirable to provide a new and improved method for enhancing the electrical conductivity of metals, metal alloys and metal oxides which does not require additional heat treatment, which provi

Problems solved by technology

Such measures require special apparatus and extremely careful handling of the materials, all of which adds cost to the fabricating of electrical devices incorporating these materials to which electrical con

Method used

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  • Method for improving electrical conductivity of metals, metal alloys and metal oxides
  • Method for improving electrical conductivity of metals, metal alloys and metal oxides
  • Method for improving electrical conductivity of metals, metal alloys and metal oxides

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[0020] A tantalum or titanium substrate similar to substrate 10 shown in FIG. 1 is first abraded on one side using a 3M Scotch-brite pad of very fine type. This produces a rough surface on the side to be coated. It is then degreased and cleaned. This is accomplished by cleaning the foil in an ultrasonic bath using acetone as a solvent for 10 minutes. Next it is washed in an ultrasonic methanol bath and then blow dried using dry, clean compressed air.

[0021] The substrate is now ready to be coated with palladium. It is placed in a Low Temperature Arc Vapor Deposition (LTAVD) apparatus similar to apparatus 22 of FIG. 2 to be coated. After the sample is loaded into the apparatus the pressue in the deposition chamber is lowered by a vacuum pump to 10−5-10−6 Torr. This gets rid of all waste gases, specially oxygen. In this process oxygen is a contaminant. The pressue is brought up to the mTorr range by introducing argon into the chamber. The substrate is biased to 600V and an arc is stru...

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Abstract

A method for improving the electrical conductivity of a substrate of metal, metal alloy or metal oxide comprising depositing a small or minor amount of metal or metals from Group VIIIA metals (Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt) or from Group IA metals (Cu, Ag, Au) on a substrate of metal, metal alloys and/or metal oxide from Group IVA metals (Ti, Zr, Hf), Group VA metals (V, Nb, Ta), Group VIA metals (Cr, Mo, W) and Al, Mn, Ni and Cu. The native oxide layer of the substrate is changed from electrically insulating to electrically conductive. The step of depositing is carried out by a low temperature arc vapor deposition process. The deposition may be performed on either treated or untreated substrate. The substrate with native oxide layer made electrically conductive is useable in the manufacture of electrodes for devices such as capacitors and batteries.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to the art of treating metals, metal alloys and metal oxides, and more particularly to a new and improved method for enhancing the electrical conductivity of metals, metal alloys and metal oxides. [0002] One area of use of the present invention is in the manufacturing of electrodes for capacitors, batteries and the like, although the principles of the present invention can be variously applied. Metals and metal alloys have a native oxide present on the surface. This is an insulating layer and hence if the material is to be used as a substrate for an electrode, the oxide has to be removed or made electrically conductive. [0003] If the oxide is removed by chemical treatment, such as by etching with an acid or electrolytic etching to expose the underlying metal, special steps must be taken in order to complete the electrical contacts before the native oxide can be regenerated and interfere with the electrical contacts. Such meas...

Claims

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Application Information

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IPC IPC(8): B32B15/01C23C14/06C23C14/14C23C14/24C23C14/32
CPCC23C14/14C23C14/16C23C14/325Y10T428/12493C23C14/022Y10T428/12722Y10T428/12507B32B15/01
Inventor MUFFOLETTO, BARRYSHAH, ASHISH
Owner WILSON GREATBATCH LTD
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