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Thermal Spray of Repair and Protective Coatings

a technology of thermal spraying and protective coatings, applied in the field of graphite, can solve the problems of large loss of carrier gas, numerous inherent defects of thermal spray coatings, and accumulation of plastically deformable materials, and achieve the effects of improving mechanical strength and corrosion protection, high speed, and high strength

Inactive Publication Date: 2018-04-19
UNIV OF CENT FLORIDA RES FOUND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method of depositing a composite on a surface using plasma spray technology. The composite is made by combining carbon nanotubes and metal or metal oxide powder using a plasma spray process. The resulting composite has higher strength and better wear properties than coatings made using conventional thermal spray. The method involves suspending graphene or graphene oxide flakes in a solution or water and then thermally spraying it onto the surface. The resulting composite has enhanced mechanical and corrosion resistant properties. The patent also describes a method of depositing a composite on a surface using crystalline graphene / graphene oxide flakes suspended in water or other polar solvent. This method also results in enhanced mechanical and corrosion resistant properties.

Problems solved by technology

The disadvantages of a cold spray process are that a large amount of carrier gas is lost, unless recycled, and that only plastically deformable materials can be deposited.
Thermal spray coatings have numerous inherent defects.
The coatings lack bulk strength.
High temperatures during deposition create unwanted oxides.

Method used

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Embodiment Construction

[0020]While the making and using of various embodiments of the present invention are discussed in detail below, it should be appreciated that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention and do not delimit the scope of the invention.

[0021]To facilitate the understanding of this invention, a number of terms are defined below. Terms defined herein have meanings as commonly understood by a person of ordinary skill in the areas relevant to the present invention. Terms such as “a”, “an” and “the” are not intended to refer to only a singular entity, but include the general class of which a specific example may be used for illustration. The terminology herein is used to describe specific embodiments of the invention, but their usage does not delimit the invention, except as outlined in the claims.

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Abstract

This invention provides a method for graphene or graphene oxide reinforcement in a metallic thermal spray coating. The incredible properties of graphene and graphene oxide make them attractive options to increase the mechanical properties in a variety of materials. Recent developments in the manufacturing of graphene oxide and reduced graphene oxide powders have greatly reduced their cost, making them viable additives in thermal spray powders for widespread use in industry.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates in general to the field of graphite, and more particularly, to compositions and methods of thermal spray of repair and protective coatings.BACKGROUND OF THE INVENTION[0002]Without limiting the scope of the invention, its background is described in connection with composite materials.[0003]Thermal Spray Coating Technology: Plasma spray is one of the most versatile forms of a thermal spray process. Plasma is capable of spraying all materials that are considered spray able.[0004]In plasma spray devices, an arc is formed in between two electrodes in a plasma forming gas, which usually consists of either argon / hydrogen or argon / helium. As the plasma gas is heated by the arc, it expands and is accelerated through a shaped nozzle, creating velocities up to MACH 2. Temperatures in the arc zone can approach 36,000° F. (19,982° C.). Temperatures in the plasma jet can still be 18,000° F. (9,982° C.) several centimeters from th...

Claims

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Application Information

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IPC IPC(8): C23C4/067C23C4/11C23C4/134C23C4/08C23C4/18
CPCC23C4/067C23C4/11C23C4/134C23C4/08C23C4/18C23C28/345C23C4/16C23C4/04C23C4/10C23C4/12
Inventor SEAL, SUDIPTAWARD, DAVIDSARAF, SHASHANKGUPTA, ANKUR
Owner UNIV OF CENT FLORIDA RES FOUND INC
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