Capacitor tantalum surface for use as a counterelectrode device and method
First Claim
1. A method for providing an inherently high effective capacitance counterelectrode surface on tantalum for use in an electrolytic capacitor, comprising the steps of:
- (a) removing existing oxide from the tantalum;
(b) depositing over the tantalum a noncontinuous layer of a first platinum family metal; and
,(c) alloying the deposited first metal with the tantalum to form an alloy layer.
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Accused Products
Abstract
A counterelectrode and a method for providing the counterelectrode wherein an inherently high effective capacitance surface is formed on tantalum. The oxide forming ability of the tantalum surface is destroyed by removing existing oxide from the surface, depositing on the surface a non-continuous layer of a platinum family metal, and alloying the deposited metal with the tantalum thereby forming alloy layer. A second layer of metal, also selected from the platinum family, may then be deposited over the alloy layer. Alternately the platinum family metal may be sputtered onto the surface of the tantalum with or without an the alloying step. The second deposition produces a spongy layer and is accomplished by conventional electrolytic techniques.
66 Citations
28 Claims
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1. A method for providing an inherently high effective capacitance counterelectrode surface on tantalum for use in an electrolytic capacitor, comprising the steps of:
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(a) removing existing oxide from the tantalum; (b) depositing over the tantalum a noncontinuous layer of a first platinum family metal; and
,(c) alloying the deposited first metal with the tantalum to form an alloy layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A counterelectrode for a tantalum electrolytic capacitor having an inherently high effective capacitance inner tantalum surface, comprising an alloy first layer formed over the tantalum surface the alloy first layer comprising tantalum and a platinum family metal.
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21. A method for providing an inherently high effective capacitance counterelectrode surface on tantalum for use in an electrolytic capacitor, comprising the steps of:
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(a) removing existing oxide from the tantalum; (b) sputtering over the tantalum a layer of a first platinum family metal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification