9 results about "Plasma electrolytic oxidation" patented technology

FIELD: protective coatings.SUBSTANCE: method for forming a protective oxide-ceramic coating on the surface of products made of valve metals and alloys by the plasma electrolytic oxidation method involves immersing the product as an electrode together with a counter electrode in a bath filled with an aqueous alkaline electrolyte, and supplying rectangular pulses of anodic and cathodic voltage to the electrodes using a pulsed power source. Anode and cathode voltage pulses are supplied with a current-free pause between them, the value of which is 4.8 times the duration of the anode pulse. The amplitude values of the cathode voltage pulses range from 85 to 149 V with a pulse repetition frequency from 1000 Hz to 4000 Hz, while the current pulse repetition frequency is additionally regulated.EFFECT: obtaining oxide-ceramic coatings with specified properties under reduced energy conditions, with lower values of cathode voltage.1 cl, 2 ex

The application discloses a preparation method of a wear-resistant and corrosion-resistant modified composite coating on a hardware product surface, and belongs to the technical field of metal surface modification. The method generates a ceramic base layer containing a nano silicon carbide reinforcing phase on the hardware product surface in situ through double-frequency double-pulse plasma electrolytic oxidation, then uniformly penetrates fluorine-containing organic silicon resin into the micropore inside the ceramic layer by using a supercritical carbon dioxide fluid impregnation technology, and finally forms a gradient structure composite coating through low-temperature plasma solidification. The composite coating prepared by the application has high bonding strength with the substrate, the surface hardness can reach above 1200HV, the friction coefficient is below 0.25, the self-corrosion current is below 5*10 ‑11 A / cm² in a 3.5% sodium chloride solution, simultaneously has excellent water scale adhesion resistance and aging resistance, and can be widely applied to the surface protection of hardware products in the fields of kitchen and bathroom, ocean engineering, mechanical manufacturing and the like.

The application discloses a device and a method for preparing a high-temperature-resistant ceramic coating on a titanium alloy surface through laser-assisted plasma sintering of nanoparticles; the device introduces one or more kinds of nanoparticles such as Al2O3, ZrO2 and CeO2 into an electrolyte column through a lateral nozzle, and the nanoparticles have good dispersibility, so that the loss of laser beams in the electrolyte column caused by a traditional nanoparticle introduction mode is avoided; in the device, laser energy directly acts on the nanoparticles, the nanoparticles are pre-melted or softened after absorbing the energy, and the nanoparticles are rapidly sintered into the coating under the action of a discharge plasma, so that the sintering efficiency of the nanoparticles in a selective area plasma electrolytic oxidation process is improved; the device accelerates the speed of the nanoparticles in participating in the formation of oxides, can improve the coating thickness and the surface micropore sealing effect, and can prepare a multifunctional composite ceramic coating by using nanoparticle solutions with different components and proportions, so that the heat resistance of the titanium alloy is improved.

An aircraft component is disclosed. The aircraft component includes a substrate, the substrate comprising at least one a first metal or first metal alloy and a ceramic coating formed on a surface of at least a portion of the substrate. The ceramic coating is formed by applying a cold sprayed material to the surface, the cold sprayed material being at least one of a second metal or second metal alloy that meets a predetermined galvanic compatibility with the first metal or the first metal alloy and subjecting the aircraft component to a plasma electrolytic oxidation (PEO) process, wherein during the PEO process the cold sprayed material on the surface is converted to ceramic.

This invention relates to the field of composite coating technology, and more particularly to a graphene-enhanced plasma electrolytic oxidation composite coating, its preparation method, and its application. The preparation method of the graphene-enhanced plasma electrolytic oxidation composite coating provided by this invention includes the following steps: mixing a graphene dispersion and a basic electrolyte to obtain a graphene-enhanced PEO composite electrolyte; using AlSi... 10 Using a Mg alloy substrate as the anode and a stainless steel electrolytic cell as the cathode, plasma electrolytic oxidation treatment is performed in the graphene-reinforced PEO composite electrolyte to obtain a graphene-reinforced plasma electrolytic oxidation composite coating. The graphene-reinforced plasma electrolytic oxidation composite coating prepared by this method exhibits excellent comprehensive properties, including mechanical properties, abrasion resistance, and corrosion resistance.

The application relates to the technical field of plasma catalysis, and discloses a plasma electrolytic oxidation catalytic transesterification reaction device, which comprises a base, a reaction barrel is fixedly installed at the top of the base, flow guide pipes are symmetrically arranged on the outer surface of the reaction barrel, a valve is fixedly installed on the outer side of the middle part of the flow guide pipe, an induction sensor is arranged on the inner side of the valve, upper and middle layer plates are arranged on the inner side of the reaction barrel, a main shaft is arranged in the upper part of the reaction barrel in a penetrating mode, and a driving motor is fixedly installed at the top end of the main shaft. The device combines dynamic discharge and bubble catalysis, adds graphite electrodes, optimizes the electrode area and interval parameters, greatly increases the catalytic active sites, excites high-density plasma active species by using the internal environment of the bubbles, realizes accurate and uniform injection of plasma energy, improves the catalytic selectivity of transesterification, amino acid hydrolysis and organic acid aging, reduces side reactions, and avoids destroying the flavor components of condiments such as soy sauce and vinegar.

This invention discloses a method for synergistic control of shape and properties and surface treatment of metal additive manufacturing parts, relating to the field of metal part processing technology. The processing steps are as follows: S1, constructing a part simulation system based on big data, simulating parameters for the current part material and shape, and obtaining optimal shape and property synergistic control parameters; S2, using additive manufacturing equipment, melting and solidifying metal powder layer by layer based on the obtained shape and property synergistic control parameters to obtain a metal additive manufacturing part blank; S3, removing the support structure on the part blank by mechanical cutting, and grinding and smoothing the cut edges; placing the part after support removal in a heat treatment furnace. This invention utilizes the synergistic effect of a dense ceramic oxide film formed by plasma electrolytic oxidation and a laser impact shot peening modification layer to significantly improve the surface hardness, corrosion resistance, and wear resistance of the part; multi-process synergistic enhancement of part performance, closed-loop controllable process, wide adaptability, and improvement of product qualification rate and production stability.

This application discloses a method and system for performance prediction and process optimization of a PEO composite coating of a seven-series aluminum alloy, relating to the field of electronic chemistry. The method includes obtaining a combination of process parameters to be tested for the composite coating, wherein the composite coating is a plasma electrolytic oxidation composite coating of a seven-series aluminum alloy synergistically reinforced with graphene and carbon nanotubes; inputting the combination of process parameters into a trained artificial neural network, an extreme gradient boosting model, and an integrated model of support vector regression and random forest regression to obtain corresponding performance parameter combinations; predicting the coating thickness and microhardness of the composite coating using the artificial neural network, predicting the friction coefficient and wear rate of the composite coating using the extreme gradient boosting model, and predicting the corrosion current density of the composite coating using the integrated model of support vector regression and random forest regression; the coating thickness, microhardness, friction coefficient, wear rate, and corrosion current density constitute the performance parameter combination of the composite coating, significantly improving prediction accuracy and efficiency.

The application discloses a preparation method of a wear-resistant and corrosion-resistant modified composite coating on a hardware product surface, and belongs to the technical field of metal surface modification. The method generates a ceramic base layer containing a nano silicon carbide reinforcing phase on the hardware product surface in situ through double-frequency double-pulse plasma electrolytic oxidation, then uniformly penetrates fluorine-containing organic silicon resin into the micropore inside the ceramic layer by using a supercritical carbon dioxide fluid impregnation technology, and finally forms a gradient structure composite coating through low-temperature plasma solidification. The composite coating prepared by the application has high bonding strength with the substrate, the surface hardness can reach above 1200HV, the friction coefficient is below 0.25, the self-corrosion current is below 5*10 ‑11 A / cm² in a 3.5% sodium chloride solution, simultaneously has excellent water scale adhesion resistance and aging resistance, and can be widely applied to the surface protection of hardware products in the fields of kitchen and bathroom, ocean engineering, mechanical manufacturing and the like.