54 results about "Coating microstructure" patented technology

The invention is directed to a blended material and method for obtaining thermal barriers for high temperature cycling applications that have both high sintering resistance to achieve a high service lifetime and low thermal conductivity to achieve high operating temperatures. These materials are additionally suited for use in high temperature abradable (rub seal) coatings. The invention provides desired coating structures so that the changes in the coating microstructure over the in-service lifetime are either limited or beneficial.

The invention relates to a metal surface modification method. The invention first obtains a textured surface with a certain surface roughness value on the surface of a material by an electron beam texturing method, forms uniform tiny pits, and increases the bonding strength of the interface; then uses plasma The spraying process uses Co-based alloy or Ni-based alloy powder as the material to form a coating; finally, laser remelting technology is used to remelt the coating surface to improve the surface structure of the coating and improve the surface performance. Compared with the existing technology, this process can realize high temperature resistance, corrosion resistance, oxidation resistance, and fatigue resistance, and has high bonding strength, and the coating structure is uniform and compact, thereby greatly broadening the application range.

The invention discloses a high hardness gradient enhanced cold roll and a preparation method for a surface laser cladding coating thereof. The cold roll comprises a cold roll base and the surface laser cladding coating. The surface laser cladding coating is arranged into a gradient structure including a laser cladding priming coating, a laser cladding transition layer and a laser cladding workinglayer. The laser cladding priming layer can reduce a thermal expansion coefficient between the laser cladding coating and the cold roll base with high carbon content, reduce the carbon content, and improve the toughness of the laser cladding coating. By adding the CeO2 strengthening phase, the laser cladding coating microstructure obtains refined grains, and the friction coefficient of the laser cladding coating can be reduced favorably at the same time. By designing the compositional gradient change of the laser cladding coating, the crack sensitivity of the laser cladding coating can be reduced.

The invention provides a method for a laser preparation of a titanium nitride gradient coating on a surface of titanium and titanium alloy. The method comprises the steps of performing surface cleaning treatment, surface blackening treatment and preheating treatment for a workpiece subatrate; and then carrying out laser nitriding treatment. The method is characterized in that the laser nitriding treatment is performed in a condition of filling reaction gas, and simultaneously laser scanning treatment and ultrasonic oscillating treatment for the surface of the workpiece subatrate are carried out. The titanium nitride gradient coating with a thickness of 50-200 [mu]m is obtained on the surface of the titanium and titanium alloy. The titanium nitride gradient coating is mainly composed of a nitride layer and a nitrogen diffusion layer, and has uniform transition of the coating microstructure. The surface hardness, wear resistance and corrosion resistance of the titanium nitride gradient coating are improved significantly than those of the matrix. Also, problems that crack are easy to produce, surface roughness is large, and the crystal grains of dendrite crystals of a nitride layer are coarse, in ordinary laser gas nitriding processes, are solved.

The invention relates to a rigid ceramic thermal-insulation tile surface coating preparation method, and relates to a ceramic thermal-insulation tile surface coating preparation method. The invention aims at solving technical problems of high water absorption, low oxidation resistance and low thermal radiation coefficient of rigid porous ceramic thermal-insulation tiles. The method comprises the steps of 1, raw material powder preparation; 2, mixed material preparation; 3, spray coating; and 4, sintering. With the method provided by the invention, the microstructure of the coating has a gradual gradient feature. The coating at a porous substrate side is porous, and the surface coating is smooth and compact. With the existence of the porous transition layer, a coating and substrate expansion mismatch characteristic can be coordinated. The method provided by the invention is used for preparing the rigid ceramic thermal-insulation tile surface coating.

The invention relates to the technical field of preparation and repair of sliding bearing Babbitt metal anti-friction layers. The novel cold spraying technology is introduced into manufacturing and repair remanufacturing of a Babbitt metal sliding bearing bush lining anti-friction layer, atomization powder feeding is adopted to obtain coating microstructures with uniform components and fine dispersely-distributed and uniformly-dense crystal grains and second phases through cold spraying, and the good interface bonding characteristic is obtained through tinning layer setting and sprayed thermal treatment; the defects of poor structure uniformity, thermal impact, stress, cracking and oxidizing burning losses existing in the technologies such as a traditional casting method, an overlaying method and a thermal spraying method are overcome, the bearing bush component preparation quality and level are improved, the bush burning frequency is decreased, stopping supercritical vibration is lowered, the stability, accuracy and reliability of a bearing transmission unit are improved, and the service life of the bearing transmission unit is prolonged; the method is rapid, efficient and environmentally friendly, is used for bearing bush manufacturing and repair remanufacturing, and has good economic benefits and social benefits.

A tri-barrier ceramic coating system is provided having a base thermal barrier layer, an intermediate CMAS barrier layer, and a top erosion barrier layer, and the method of applying such a coating system to a substrate. The base layer has a typical columnar structure with inter-columnar gaps and intra-columnar micro-pores that provides the stress tolerance during thermal cycles. The intermediate CMAS barrier layer has the fiber-like columns with inter-columnar nano-pores and a grid structure on the bottom of the layer. The fine structured intermediate layer covers the gaps between the columns of the base layer and will block CMAS infiltration effectively. The top erosion resistant layer contains wider TBC columns with narrow inter-columnar gaps and a modified cauliflower-like TBC head that provides erosion resistance for the underlying layers. The tri-barrier coating microstructure will further reduce the thermal conductivity as comparing to the conventional single layer system.

The present invention discloses a high wear-resisting iron-base thermal spraying coating material, the high wear-resisting iron-base thermal spraying coating powder is made of a metal material, the metal material comprises the following the chemical components by weight: 10-18% of Cr, 0.20-0.50% of C, 0.8-2.0% of Si, 1.5-3.0% of Mn, 0.62-0.88% of Al, 0.55-0.87% of Ti, 0.5-2.0% of Ni, Mn and Ni with the total content of 3.2-3.6%, at least one of Mo and W with the total content of 1-8%, 0.41-0.63% of lanthanum rare earth, and balance of Fe and unavoidable impurities; the coating microstructure is Cr7C3 strengthening phase dispersed austenite, the lanthanum rare earth comprises the following the components by mass: 4-11% of cerium, 10-13% of terbium, 15-22% of gadolinium, 12-15% of praseodymium and balance of lanthanum, the total content of the cerium, terbium, gadolinium, praseodymium and lanthanum is 100%, and the iron-base composite coating powder has good high temperature oxidation resistance, can avoid excessive oxidation in the process of spraying so as to improve the compactness of internal combination of the sprayed coating, the sprayed coating is moderate in pore size and smooth and round in shape, the production of cracks can be effectively reduced, and the tank body oil storage function can be well played.

The invention discloses a laser repair method of a high-carbon hard-face crack-free large-thickness cold roll. The laser repair method comprises the steps that a to-be-repaired area of the cold roll face is determined, and the surface of the to-be-repaired area is pretreated; the to-be-repaired area is subjected to preheating treatment, and a low-carbon transition layer is prepared on the to-be-repaired area through laser cladding; multiple high-carbon work layers are prepared on the surface of the low-carbon transition layer through laser cladding; and the surface of a laser repair layer formed by the low-carbon transition layer and the high-carbon work layers is subjected to grinding treatment till the axle diameter dimension and roughness of the surface of the laser repair layer are consistent to the process requirements of the cold roll. According to the laser repair method, through reasonable design to alloy powder components and optimization selection of process parameters, the crack-free laser repair layer is prepared, and the coating microstructure is uniform and compact; and through reasonable control over the structures and thickness of the laser repair layer, the structure and performance of multiple cladding layers effectively cooperate, the laser repair layer large in thickness and high in performance can be prepared, and the repair efficiency of the roll is greatly improved.

The invention, which belongs to the technical field of the backlight source device in a liquid crystal display module group, relates to a diffusion film, particularly to an anti-scratching diffusion film and a method for preparing the same. In order to solve a problem that particles in an anti-adhesion layer are easy to shed during a diffusion film assembling process, the invention provides an anti-scratching diffusion film and a method for preparing the same. The diffusion film comprise a base material; and a positive coating layer is arranged at one side of the base material and a back coating layer is arranged at the other side. The positive coating layer contains scattering particles; a positive coating microstructure being in a hemispherical shape is formed at the surface of the positive coating layer and the diameter range is 30 to 70 microns. The back coating layer contains scattering particles; a back coating microstructure being in a hemispherical shape is formed at the surface of the back coating layer and the diameter range is 5 to 30 microns. The diffusion film has an excellent optical performance and good anti-scratching property. Besides, the preparation method employs a way of simultaneous transferring of the front side and the back side; and thus one-step moulding is realized, the process is simple, and the method is easy to implement.

The invention relates to a method for preparing a large-size micro-groove bionic antifouling coating by a template imprinting method. The method comprises the following steps that a specific bionic microstructure morphology is etched on a plane template or a roller template through laser, the microstructure template is coated with a release agent, then the bionic microstructure template is directly imprinted on the surface of a surface-dried antifouling coating to be subjected to overturning and forming, the bionic antifouling coating with the microstructure morphology is obtained, and then the bionic antifouling coating with the large-area microstructure is prepared through multiple times of imprinting of the microstructure plane template or continuous rolling imprinting of the microstructure roller template. The method can be carried out under the room temperature condition, the requirement for preparation conditions is low, operation is easy, and preparation of the large-area coating microstructure surface can be achieved; and the prepared bionic antifouling coating has the advantages of uniform surface microstructure morphology, no crack, no shedding, and good antifouling effect.

The invention relates to a detection method of a flame spraying type CuAl/NiC coating microstructure. The detection method comprises the following steps: (1) preparing metallographic specimens; (2) detecting the coating microstructure; (3) determining a qualified index of the coating microstructure; (4) judging whether the coating microstructure is qualified or not. Through using the detection method, the metallographic specimens can be prepared systematically according to the requirement; the judging method and the qualified index of the coating microstructure can be proposed; the quality control level of the flame spraying type CuAl/NiC abrasive sealed coating is increased.

The invention belongs to the field of composite photocatalytic coatings and relates to a composite photocatalytic coating and a preparation method thereof. The preparation method of the composite photocatalytic coating comprises coating a base with a coating material through a ball milling method to obtain a coated body and keeping the coated body at a temperature of 973-1273 K for 2-15h, wherein the base comprises one or more of an Al2O3 ceramic body, a metal body and an alloy body and the coating material comprises one or more of TiC powder, titanium dioxide powder, metal powder and alloy powder. The coating microcosmic structure and even atomic and electronic structures of the composite photocatalytic coating produce substantial change in a mechanical coating process. In thermal oxidation, a series of physical and chemical changes are produced so that a functional coating with a unique microstructure is formed and has substantially higher photocatalysis functions.

The invention provides a method for characterizing the microstructure of a nano-structure thermal barrier coating by adopting a terahertz nondestructive testing technology, which comprises the following steps: preparing different microstructure coatings by adopting an adjusting process, and determining the microstructure characteristics of the coatings by adopting metallographic analysis; carrying out terahertz nondestructive testing to obtain the real refractive index of the ceramic coating; constructing a linear relation between the real refractive index and the coating microstructure characteristics; and based on the linear relation, constructing the range comparison relation between the real refractive index and the coating microstructure characteristics, wherein the coating microstructure characteristics of coatings prepared by different processes can be qualitatively or semi-quantitatively analyzed through terahertz nondestructive testing by utilizing the range comparison relation. The method has the characteristics of no damage, high efficiency, convenience in operation and high detection precision. Meanwhile, the data result of the method shows the characteristics that the data parameter rule guidance is clear, the data characterization method is simple, convenient, efficient and scientific, and powerful support can be provided for controlling the coating quality or providing rapid and effective nondestructive testing for process optimization.

Methods for coating a target surface of an article having one or more passageways include fluidly connecting a temperature controlled fluid to at least one passageway, passing the temperature controlled fluid through the at least one passageway, wherein the temperature controlled fluid at least partially controls a temperature profile of the article, and coating the target surface, wherein the temperature profile of the article at least partially controls a microstructure of the coating.

The invention discloses a preparation method for ferrite/reductive metal composite particles and a method for preparing high-temperature invisible coating layers based on laser 3D printing, belongs tothe technical field of wave absorption coating layer preparation, and solves the problems of insufficient coating layer/basal body bonding force of traditional high-temperature wave absorption coating layers, difficult control of microscopic structures of the coating layers and incapability of guaranteeing electromagnetic performances. Nanoscale ferrite powder and nanoscale reductive metal powderare prepared as composite particles through a mixed granulation process; in a closed preparation cavity of 3D printing equipment, the composite particles are prepared as the high-temperature invisible coating layers on the surfaces of substrates through laser induced in-situ reaction. The preparation method is applied to high-temperature invisibility and electromagnetic pollution prevention of components.

An apparatus and method is disclosed for simultaneously electroplating at least two parts in a series electrical configuration in an electroplating system using a shared electrolyte with excellent consistency in thickness profiles, coating weights and coating microstructure. Parts in high volume and at low capital and operating cost are produced as coatings or in free-standing form.

The invention relates to a titanium diboride-nickel thin film with coating structure. The TiB2-Ni thin film is characterized by being prepared from a continuous phase metal Ni and a dispersed phase TiB2 grains through in-situ synthesis. In the TiB2-Ni thin film, metal Ni in a three-dimensional continuous cellular structure uniformly form a basic framework of the thin film, and the TiB2 grains in granular shape uniformly fill in the cellular structure, so as to form a coating microstructure with metal Ni evenly coated with TiB2 grains; and the TiB2 accounts for 60- 95at.%, and Ni accounts for 5-40at.%. The TiB2-Ni thin film with coating structure provided by the invention shows good toughness and high hardness, so as to greatly expand the scope of application of the thin film. A double-target co-sputtering magnetron sputtering technology is easy to operate; composition, structure and performance of the TiB2-Ni thin film material can be well controlled through control of process conditions; and the method does not require a post-treatment process, has short preparation period, low cost and good reproducibility, and is easy to realize industrialized production.

The invention discloses a preparation process of a calcium-doped sodium tantalate bioactive film layer on a tantalum surface, which comprises the following steps of: firstly, carrying out hydrothermal treatment on a tantalum substrate by using a NaOH-containing aqueous solution as a hydrothermal solution and adopting an optimal hydrothermal condition, and then carrying out molten salt treatment in calcium-containing powder to obtain a calcium-doped sodium tantalate coating on the tantalum surface. The microstructure of the obtained coating is cubic, the phase is sodium tantalate, calcium is doped in the coating of the cubic structure, the calcium-doped sodium tantalate coating is tightly combined with a base body and good in hydrophilicity, the surface roughness of the obtained film layer is moderate, bone apatite can be rapidly induced to be formed in a similar body fluid environment, osteoblast proliferation can be well promoted, and the bone repairing effect is good. The excellent biological activity is realized.

The invention discloses a flux-cored welding wire with good toughness and low porosity. The welding wire includes a mild-carbon steel strip sheath and a flux core, wherein the flux core is prepared from, by weight, 0.4-0.6% of graphite, 10-14% of chromium powder, 2-4% of manganese dioxide, 3.5-5.5% of nickel powder, 3-5% of columbium powder, 2-4% of zirconium powder, 0.4-0.6% of silicon dioxide, 9-10% of rhenium oxide, 12-14% of magnalium, 6-8% of fluoride, 1.5-4.5% of lithium carbonate and the balance iron powder. The welding coating of the flux-cored welding wire has the advantages of being low in porosity, compact in coating microstructure and good in toughness.

The invention discloses a coating preparation method for realizing high-efficiency operation of PS-PVD equipment, and aims to solve the technical problems that in the existing process of preparing a thermal barrier coating through plasma physical vapor deposition, the plasma jet utilization rate is low, the preparation cost is increased, and the microstructure consistency and the thickness uniformity of a surface coating are difficult to guarantee when a workpiece is sprayed. In the process of preparing the thermal barrier coating through plasma physical vapor deposition, the vacuum degree of a vacuum chamber, the spraying power of PS-PVD equipment and the spraying current are regulated and controlled, the diameter of plasma jet is made to be 50-100 mm, and an optimized design scheme is provided for the regulation and control range of three parameters and the coordinated regulation and control range of the three parameters. The heating capacity of the plasma jet is correspondingly improved, spraying powder is gasified more sufficiently, liquid phases and unmelted particles in the jet are correspondingly reduced, the utilization rate of the plasma jet is greatly increased, energy is effectively saved, the production cost is reduced, and the consistency of the microstructure of the prepared coating is better.

The invention discloses a method for improving a microstructure of a coating. Before spraying, heating the back surface of a base material to a certain temperature (the heating temperature of the backsurface of a ceramic powder spraying base material is 600 DEG C to 700 DEG C, and the heating temperature of the back surface of a metal powder spraying base material is 350 DEG C to 450 DEG C). In the spraying process, heating of the back face of the base material is kept all the time, and meanwhile the surface of the deposited coating is subjected to strengthening treatment (shot blasting strengthening can be adopted for ceramic powder spraying, and laser shock strengthening can be adopted for metal powder spraying). The steps are repeated until the coating reaches a certain thickness, andthen spraying is stopped. The microstructure of the coating is improved by heating the back surface of the base material to a constant temperature and carrying out impact strengthening on the surfaceof the deposited coating in the spraying process, and the method is simple and high in operability. Compared with a coating microstructure prepared by a traditional method, the improved coating microstructure is compact, the porosity is reduced, the layered structure partially disappears, and the performance of the coating is greatly improved.