7549 results about "Composite coating" patented technology

Systems and methods are described for implants with composite coatings to promote tissue in-growth and/or on-growth. An implant includes: a substrate; a structured surface formed on at least a portion of the substrate; and a biocompatible coating deposited on at least a fraction of the structured surface. The systems and methods provide advantages in that the implant has good biocompatibility while the biocompatible coating has good strength.

A polyurea composition, a multi-component composite coating and articles formed therefrom, and methods of forming the same are disclosed. The coating composition is formed from a reaction mixture comprising an isocyanate-functional component and an amine-functional component. The ratio of equivalents of isocyanate groups to equivalents of amine groups is greater than 1 while the volume mixing ratio of the isocyanate-functional component to the amine-functional component is capable of being applied to a substrate at 1:1.

The present invention discloses novel polymer-ceramic matrix composites and processes for making same. The composites can be used in biomedical applications, in particular, coatings of implants and other medical devices, where both the ceramic phase and the polymer phase are bio-compatible. The composites combine a reinforcing polymer phase with a continuous ceramic matrix to create materials with properties that are new and superior to polymer or ceramic phases alone. The composites can incorporate a bioactive agent.

A method of modifying a bottomhole assembly that includes metal plating at least a portion of a bottomhole assembly, wherein the metal-plating comprises superabrasive nanoparticles is disclosed.

The invention discloses a highly-wear-resistant super-hydrophobic composite coating and a preparation method thereof. The preparation method includes the steps that the surface of a base is coated with hydrophobic resin primer containing compound micropowder through a brush coating or spray coating method, the surface of the resin primer is sprayed with hydrophobic organic/inorganic hybrid nano-paint after semi-curing, and the highly-wear-resistant super-hydrophobic composite coating is obtained after complete curing. The highly-wear-resistant super-hydrophobic composite coating and the preparation method thereof have the advantages that equipment and the process are simple, operation is easy and cost is low, and have the industrial mass production prospect. The prepared super-hydrophobic composite coating can be applied to various hard/soft bases such as glass, copper, aluminum, stainless steel, exterior wall tiles, wood, paper and cloth and can bear damage of external force such as sanding.

A process for applying two electrodeposited coatings, one on top of the other, to an electrically conductive substrate is provided. An electrically conductive first coating is applied to provide for corrosion resistance and a second polyurethane-based coating is applied to the first coating to provide chip resistance. Also, aqueous dispersions of the polyurethane coating compositions are disclosed.

Proppants for hydraulic fracturing of oil and gas wells have a polymeric coating that is strengthened with reinforcing particulates that are reactive with, or chemically bonded to, the polymeric proppant coating. Preferably, these particulates are added into the coating during the coating process. In one embodiment, functionalized particulates are used that become grafted into the polymer of the proppant coating through the chemical functionality imparted to the particulates. If non-functionalized particulates are used, a coupling agent is preferably added to enhance the bond strength between the added particulates and the polymeric matrix of the proppant coating.

The invention belongs to the technical field of chemical engineering coatings and particularly relates to a hydrophilic nano zinc based composite coating used for preventing corrosion on the surfaces of the metal parts. The coating comprises an emulsifier, a dispersant, an antifoaming agent, scaly metallic powder, nano oxides, a silane coupler, an alcohol-type solvent, a high-molecule organic material, a thickener and 30.0 to 60.0 percent of water serving as a disperse medium. The coating can be coated by spraying, brushing, soaking and soaking-centrifugal coating and other methods, and the coating can be formed by being roasted at a temperature of about 200 DEG C for 20 minutes. Neutral salt spray corrosion resistant tests show that the neutral salt spray corrosion resistant time is more than 800h, the binding force is proved to be above level 4 (by an adhesive band test). The coating has the advantages of environmental pollution prevention, excellent metallic corrosion resistant property, economy and practicability and convenient use; and moreover, the coating can be widely used for the corrosion resistant treatment of the surface of metal parts made of iron, aluminum, copper and magnesium alloy and the like, particularly the corrosion resistant treatment of metal parts with complex geometric shapes.

A composite powder for a deposition of a composite coating comprises a nonmetallic component and a metallic component, the metallic component having an amorphous structure or a nanocrystalline structure. The metallic component may include an amorphous metallic alloy. The metallic alloy may include constituents having the amorphous structure. The metallic component may include a combination of the metallic alloy existing in the amorphous state and constituents of the amorphous metallic alloy in the amorphous state. The composite metal-ceramic powders are used for depositing composite coatings on a selected surface. Disclosed are several methods and systems for producing such composite powders. Disclosed are also several methods and systems for depositing composite coatings. Advantageously, the deposited coatings exhibit high corrosion resistance, high wear resistance, and excellent structural properties.

The invention discloses a method for preparing a metal surface laser strengthened coat, which comprises the following steps: preparing uniformly mixed powder of titanium dioxide hydrate and graphite powder by using a wet chemistry method; pre-placing the mixed powder on the surface of a basal body; and irradiating the surface of the basal body by using laser as a heat source under an argon atmosphere to form a molten pool, performing a carbon-thermal chemical reaction on the pre-placed mixed powder under a high-temperature environment to generate titanium carbide, and finally forming a titanium carbide composite coat on the surface of the basal body. In the same way, the method is also suitable for preparing a TiN enhanced composite coat by mixing hydrated oxide thereof and graphite by the wet chemistry method, then mixing the mixture and urea to form pre-placed powder and cladding the pre-placed powder on the basal body by laser. The surface of the enhanced coat prepared by the technical scheme is smooth, and has no cracks or pores; enhancing particles are uniformly distributed in the coat; the enhanced coat and the basal body are metallurgically combined; and the mixed powder prepared by adopting the wet chemistry method is uniformly mixed, ensures complete reaction, and is suitable for industrial popularization and application.

The invention discloses a super-hydrophobic and oleophobic composite coating which comprises a super-hydrophobic and oleophobic primer coat layer and a super-hydrophobic and oleophobic finishing coat layer. The coating is characterized in that the super-hydrophobic and oleophobic finishing coat layer is located on the super-hydrophobic and oleophobic primer coat layer; the super-hydrophobic and oleophobic primer coat layer is coated by a super-hydrophobic and oleophobic primer coat which is a composition containing epoxy resin, an auxiliary A, extinction powder and a solvent; the super-hydrophobic and oleophobic finishing coat layer is coated by a super-hydrophobic and oleophobic finishing coat which is a composition containing fumed silica, an auxiliary B, an auxiliary C, a mixed solution A and a mixed solution B. Compared with the prior art, the super-hydrophobic and oleophobic composite coating disclosed by the invention not only has a super-hydrophobic performance, but also can resist greasy dirt and has a super-oleophobic performance as well as good wear resistance and stability; the preparation process is simple, and realization of industrialized production is facilitated.

The invention relates to a high-temperature wear-resistant composite coating for the flue of an electrical furnace, belonging to the high-temperature coating field. The invention enhances the strength and toughness of the material, improves the high-temperature performance of the material and forms mullite net compound structure under high temperature condition by using modern composite material principle and a coupling method by particle enhancing and fiber toughness increasing and adding high-performance material and using nano-compound powder as bonding and using hard high-strength particle as enhancer, further, the invention can also improves the volume stability and the rear resistant performance in high temperature, and prolongs service life. The invention is especially suitable for the flue of a furnace, and has the advantages of high refractoriness, wear-resistant performance, excellent high temperature performance, stable volume, high strength, good toughness, prolonging service life of the material, reducing maintenance times for the flue, and labor saving.

Disclosed is a novel polymeric composite coating including a nanoparticle filler, where the filler may be suitable to alter one or more characteristics of the coating. More particularly, one embodiment of the present invention provides a novel halloysite nanoparticle filler which has the general configuration of a cylinder or a rolled scroll-like shape, and a polymer protective coating containing the halloysite nanoparticle or equivalent nanotubular filler.

A laser cladding method for strengthening the surface of a piercing point includes the following steps of: (1) prefabricating WC/Co-base cladding powder; (2) pre-processing the surface of a piercing point workpiece, and cleaning up stain and rust; preheating for 2 to 5 hours at a temperature between 400 DEG C and 600 DEG C; (3) cladding the prefabricated composite powder fed in the way of reverse synchronization or coaxially in multiple steps by a CO2 laser; simultaneously, carrying out synchronous inert gas protection on the laser-cladding area; and (4) subsequent processing. The laser cladding method adopts laser to prepare a WC ceramic particle-strengthened Co-base composite coating on the surface of the piercing point, and the coating is metallically combined with the matrix, so the binding force between the coating and the matrix is enhanced; the maximum thickness of the coating can reach a few millimeters; and as the surfaces of WC particles are coated with Ni, the absorption of laser energy by the WC can be reduced, so that the burnout rate of the WC can be reduced in a laser melting pool. The distribution of the WC particles is uniform in the coating, the rigidity of the coating is high, consequently, the service performance of the piercing point can be improved, and the service life can be prolonged.