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Composite article comprising a ceramic coating

A technology of ceramic coating and ceramic coating, which is applied in the direction of coating, layered products, electrolytic coating, etc., and can solve problems such as unclearness and affecting the process

Inactive Publication Date: 2006-05-10
OLIMEX GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this disclosed method is capable of forming thicker coatings at high deposition rates, it is unclear how the current waveform is maintained and controlled during deposition of the ceramic, and how possible deviations from the waveform would affect the process

Method used

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  • Composite article comprising a ceramic coating
  • Composite article comprising a ceramic coating
  • Composite article comprising a ceramic coating

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Embodiment Construction

[0036] In the following description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the invention. However, it is apparent that the present invention can be practiced by those skilled in the art without these detailed descriptions. In other instances, well-known structures and mechanisms are described in diagrammatic form in order not to unnecessarily obscure the invention.

[0037] The present invention provides methods for forming ceramics on articles such as, but not limited to, valve components formed from metals, such as a metal, metals or alloys, in an alkaline electrolyte at a temperature of about 15-40°C coating. The method involves immersing the article as an electrode in an electrolytic cell containing an aqueous solution of an alkali metal hydroxide and a metal silicate, such as an alkali metal silicate, including but not limited to sodium or potassium silicate . A second electrode may be provided, whic...

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Abstract

By immersing a first anode comprising a conductive article in an aqueous solution containing an alkali metal hydroxide and an alkali metal silicate, a second cathode is provided, in contact with the electrolyte, and an alternating current of a resonant power source is passed through the first electrode as the anode and The second electrode as the cathode, while keeping the angle φ between the current and the voltage at 0 degrees, and maintaining the voltage between the first and second electrodes within a predetermined range to form a ceramic coating on the conductive article. The final ceramic coated article comprises a metal, silicon, oxygen containing coating, wherein the concentration of silicon increases in the direction from the surface of the article to the outer surface of the ceramic coating surface layer.

Description

field of invention [0001] The present invention relates to a composite article, and more particularly, to a composite article comprising a metal with a ceramic coating on at least one surface thereof. The invention also relates to a ceramic coating process for metals and alloys thereof. Background of the invention [0002] Coated articles can be used in many different applications, including, but not limited to, aerospace, automotive, marine, oil, gas and chemical engineering, electronic instruments, medicine, robotics, textiles and other industries. A useful but non-limiting use of coated articles is for coating valve metals (e.g., barrier-forming metals or rectifier metals) and their alloys, such as aluminum, which are widely used in different industries, Magnesium, titanium and their alloys. In order to improve the wear resistance, chemical resistance and dielectric strength of a valve, valve part or valve surface, for example, a protective layer is applied to its corre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04B32B9/00C04BC25BC25D3/02C25D5/18C25D9/04C25D11/02C25D11/08
CPCC25D9/04C25D11/08C25D11/026B32B15/04B32B9/04B32B9/00
Inventor S·布卡
Owner OLIMEX GROUP
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