251results about "Molten spray coating" patented technology

A brake disc for a disc brake may have a braking band made of gray cast iron or steel, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc. The disc is provided with a base layer constituted by steel having a nickel content of at most 15% which covers at least one of the two braking surfaces of the braking band.

This invention discloses a processing method for thermal spraying of flat workpieces. The processing method includes: taking a flat workpiece to be processed and constraining it using a processing fixture, the processing fixture including a support platform and a constraint component; placing the flat workpiece on the support platform and pressing the flat workpiece onto the support platform using the constraint component; operating a sandblasting device and a spraying device to sequentially perform sandblasting and spraying treatments on a first working surface of the flat workpiece; removing the flat workpiece, flipping it over, and pressing the flat workpiece onto the support platform again using the constraint component; operating the sandblasting device and the spraying device again to sequentially perform sandblasting and spraying treatments on a second working surface of the flat workpiece; removing the flat workpiece after sandblasting and spraying treatments and placing it in a heat treatment furnace for heat treatment to obtain the finished flat workpiece, maintaining the stability of the workpiece in the secondary processing, and improving the reliability and efficiency of the thermal spraying operation.

The present application relates to the field of high-speed spraying technology, in particular to a supersonic flame spraying process for steam turbine blades. The present application overcomes the problems of insufficient coating bonding strength and poor corrosion resistance of the supersonic flame spraying. The present application uses nickel-coated alumina composite sand for sandblasting pretreatment of the blades to achieve micro-implantation of active nickel; adjusts the ratio of NiCr and Cr3C2-NiCr powders by using double powder feeders to build a gradient structure coating with continuous component change; uses a modified sealing agent containing nano-alumina for vacuum impregnation sealing; and finally obtains finished blades through graded vacuum diffusion annealing. Through surface nickel implantation, gradient structure design and diffusion annealing, the present application realizes metallurgical bonding and thermal stress matching between the coating and the substrate, greatly improving the bonding strength; at the same time, the in-situ ceramicization reaction of the sealing agent eliminates micro-pores, significantly enhancing the corrosion resistance of the coating.

The application discloses a preparation method of a high-wear-resistance railway turnout coating and relates to the technical field of railway turnout coatings. A surface grafted modified nano tungsten carbide reinforcing phase is formed; a nano composite pre-alloy powder is obtained; a spherical high-entropy alloy composite spraying powder with high fluidity is obtained; a rough anchoring surface with a micron-level staggered grid structure is constructed on the surface of a base material; a base coating substrate with a thermal expansion gradient buffer feature is obtained; an initial cladding coating workpiece is obtained; and the high-wear-resistance railway turnout coating is prepared. The application excludes closed pores in the powder, and significantly improves the density and fluidity of the powder.

This invention provides a carbon fiber reinforced polymer (CFRP) composite material that enhances the anchoring effect of the metal layer to the CFRP substrate and improves adhesion. [Solution] The CFRP composite material comprises a base material made of CFRP, a first metal layer laminated on the surface of the base material, and a second metal layer laminated on the surface of the first metal layer. The surface of the base material has carbon fiber cutting grooves formed to a depth in which the carbon fibers in the base material are actually cut, and the first metal penetrates into the grooves and is fixed therein. The manufacturing method includes (1) forming the cutting grooves, (2) laminating the first metal layer by thermal spraying (with penetration into the grooves), and (3) laminating the second metal layer by plating.

A thermal barrier coating (110) for a substrate (102) that has a major surface (104). The thermal barrier coating (110) comprises: a bond coat layer (112) disposed on the major surface (104) of the substrate (102); a thermally grown oxide (TGO) layer (114) disposed on the bond coat layer (112); and a top coat layer (116) disposed on the TGO layer (114). The top coat layer (116) comprises a ceramic top coat material (120) that comprises: a matrix phase (122) comprising at least one compound of formula ABO4, AB3O7 or AB3O9, where A is a rare-earth element, B is selected from the group consisting of niobium and tantalum, and O is oxygen; and an inclusion phase (124) that is dispersed in the matrix phase and comprising at least one compound of formula CO2, where C is selected from the group consisting of zirconium, titanium or hafnium, and O is oxygen.

Known protective layers with a high Cr content and additionally silicon form brittle phases that become even more brittle under the influence of carbon during use. The protective layer according to the invention has the composition NiCoCrAlYTaSiHf: 22% - 24% cobalt (Co), 14% - 20% chromium (Cr), 8.0% - 12.0% aluminium (Al), 0.2% - 0.6% at least one metal from the group comprising scandium (Sc) and / or rare-earth elements, 1.0% to 3.0% tantalum (Ta), 0.1% to 0.7% silicon (Si), 0.1% to 1.0% hafnium (Hf), nickel (Ni).

An article may include a substrate. An article may include a barrier layer on the substrate, the barrier layer including: a bond coat comprising a matrix, diffusive particles disposed in the matrix, and gettering particles disposed in the matrix, and a topcoat comprising a first top coat layer adjacent the bond coat and a second top coat layer disposed on the first top coat layer, the first top coat layer having a lower porosity than the second top coat layer.

The application discloses a kind of plasma spraying self-reduction TiC / Ti composite coating and its preparation method and application, belong to thermal spraying coating field, TiC powder, deionized water and binder are mixed and stirred and ball milled, and TiC spherical powder is prepared by spray granulation;Using plasma spraying process, TiC spherical powder is sprayed on substrate, so that TiC occurs self-reduction reaction to generate Ti metal phase, and forms plasma spraying self-reduction TiC / Ti composite coating on substrate;In plasma spraying self-reduction TiC / Ti composite coating, Ti metal phase is distributed between TiC ceramic phase, and forms layered inlay structure.The application uses TiC powder as raw material, and generates Ti metal bonding phase in situ by adjusting and controlling plasma spraying process parameters during spraying process, avoids additional metal bonding phase and subsequent annealing treatment, simplifies process flow and reduces cost.The bonding strength of the prepared plasma spraying self-reduction TiC / Ti composite coating can reach 52.40 MPa at most, which significantly improves the problem of large brittleness and poor interface bonding of traditional TiC coating.

The present application relates to the technical field of high-temperature oxidation-resistant coating, and particularly relates to a modified NiCoCrAlYTa bonding layer and a preparation method thereof.The present application adopts low-pressure plasma gas spraying to prepare a NiCoCrAlYTa bonding layer on the surface of a high-temperature alloy substrate, then performs shot peening treatment to reduce the surface roughness of the coating, then performs Al-Cr co-diffusion, and forms a co-diffusion bonding layer with an outer Al-rich layer, an intermediate Cr-rich layer and an inner NiCoCrAlYTa layer, finally performs vacuum pre-oxidation to form a TGO layer on the surface of the co-diffusion bonding layer, thereby obtaining the modified NiCoCrAlYTa bonding layer.The modified NiCoCrAlYTa bonding layer prepared by the present application has excellent high-temperature oxidation resistance and corrosion resistance, and can realize long-time service.

Presented herein are alloys based on Mo-Ni, where when coated using PTA, LC, HVOF, HVAF and / or APS, a dense and durable coating is formed. When the alloys of the present invention are applied in a thickness from 0.1 mm - 5 mm, the resulting coating is suitable for use as a coating for the pot rolls of a galvanizing line.

This invention discloses a composite thermal spray powder for wear-resistant coatings and its preparation method, relating to the field of thermal spray materials technology. The composite thermal spray powder for wear-resistant coatings comprises, by weight, the following components: 18-26 parts of a metal matrix material, 54-66 parts of a hard reinforcing phase, 8.5-12.5 parts of nano-Ti powder, 2.6-3.3 parts of a reactive carbon source, 0.8-1.5 parts of a buffer carbon source, 0.8-1.2 parts of a transient liquid phase additive, 1.5-2.5 parts of a lubricating functional component, and 0.5-1.5 parts of a modified coating material. The composite thermal spray powder for wear-resistant coatings provided by this invention has the following beneficial effects: precise and stable introduction of the reinforcing phase, and stable self-lubricating properties.

This invention discloses a high-entropy aluminate-modified high-entropy zirconate thermal barrier coating ceramic material, its preparation method, and its application. This invention uses five rare earth oxides—La₂O₃, Nd₂O₃, Gd₂O₃, Er₂O₃, and Y₂O₃—along with Al₂O₃ and ZrO₂ as raw materials. The five rare earth elements are mixed in equimolar ratios and synthesized (La₂O₃, Nd₂O₃, Gd₂O₃, Er₂O₃, and Y₂O₃) via high-temperature solid-state reaction in a muffle furnace. 0.2 Nd 0.2 Gd 0.2 Er 0.2 Y 0.2 AlO3 high-entropy aluminate powder and (La 0.2 Nd 0.2 Gd 0.2 Er 0.2 Y 0.2 2Zr₂O₇ high-entropy zirconate powder; high-entropy aluminate powder is added to the powder at a ratio of 15%~25% of the total mass of high-entropy zirconate powder, and ball-milled using anhydrous ethanol as the dispersion medium and ZrO₂ ball milling beads as the milling medium. After drying and sieving, the mixture is placed in a rapid hot-pressing sintering furnace and rapidly hot-pressed at 1500℃~1700℃ and 30~50MPa for 10~30min. The resulting ceramic material has low thermal conductivity, good mechanical properties, and excellent resistance to CMAS corrosion, and can be used for thermal barrier coatings on hot-end components of aero-engines.

This invention relates to the field of heat exchange materials technology, and discloses a high-temperature, high-pressure nano-conductivity heat exchange material. The heat exchange material comprises a metal matrix, a linearly distributed metal-ceramic gradient transition layer, and a nano-composite ceramic surface layer. The surface layer consists of 90-95 parts of nano-alumina and zirconium oxide composite powder and 5-10 parts of cubic phase nano-titanium nitride powder. The former is fused and stacked to form a continuous ceramic matrix, while the latter is monodispersed and anchored within it, with adjacent particles in contact. The heat exchange material is prepared by gradient layer spraying with a linearly decreasing plasma current as the ceramic composition increases, followed by back-side cooling of the matrix. The surface layer is sprayed using a coaxial air knife in a reducing atmosphere combined with a low-enthalpy jet to inhibit oxidation and vacuum diffusion annealing. This invention synergistically regulates the above-mentioned structure and interface state to achieve a balance between high thermal conductivity, excellent corrosion resistance, and high bonding strength, which helps extend the service life of heat exchange components under high-temperature and high-pressure environments.

The present application relates to the field of environmental barrier coatings or thermal barrier / environmental barrier integrated protective coatings, and discloses a non-eutectic ternary rare earth double-silicate environmental barrier coating and a high-energy plasma preparation method thereof. The present application aims at the current situation that the single-rare earth main element double-silicate environmental barrier coating has poor water vapor corrosion resistance, and uses an axial powder feeding high-energy plasma spraying system to prepare a non-eutectic ternary rare earth double-silicate coating which has excellent high-temperature water vapor corrosion resistance, so that the service life of SiC f / SiC material in a high-temperature water vapor environment can be effectively improved. The specific process is that rare earth oxides and silicon oxides are used as raw materials, and mechanical mixing, pressureless sintering, spray drying, high-energy plasma spraying and high-temperature heat treatment are sequentially performed to prepare the non-eutectic ternary rare earth double-silicate environmental barrier coating which has a dense interior, low porosity and excellent high-temperature water vapor corrosion resistance.

The invention discloses a novel method for preparing a metal bonding substrate. A method may include providing a ceramic substrate including a ceramic body. The method may include bonding a thick metal plate to the ceramic substrate, where the bonding includes forming a metal oxide layer by powder deposition on a metal surface and bonding the ceramic substrate and the thick metal plate together, where after the bonding, the ceramic substrate and the thick metal plate are bonded together. The metal oxide layer and the thick metal plate interact to form an interfacial layer between the thick metal plate and the ceramic substrate.

In non-contact surface shape measurement of a film using a laser, the surface area S (μm²) within a single evaluation region of the measurement surface (SL surface) of the film surface is measured. 2 The area A (μm²) within one evaluation region of the reference surface, which is a plane located at the arithmetic mean height of the measurement surface (SL surface), is defined as the area A within one evaluation region of the reference surface. 2 A thermal spray coating having a film surface in which the area ratio S / A obtained by dividing by ) is 1.75 or more and 3 or less, and the surface roughness Sa within one evaluation area of ​​the measurement surface (SL surface) is 0.4 μm or more and 8 μm or less. [Effects] According to the thermal spray coating and thermal spray component of the present invention, when the thermal spray coating is used as a corrosion-resistant coating and dry etching is performed using gas plasma in semiconductor manufacturing equipment, the generation of particles caused by cracks in the thermal spray coating can be reduced.

The application discloses a heat-resistant salt-corrosion YSZ-based composite ceramic coating and a preparation method thereof, and belongs to the technical field of thermal protection coatings. The method comprises the following steps: mixing YSZ powder and high-entropy rare earth aluminate powder to prepare a composite powder; first, preparing an alloy bonding layer on the surface of a substrate, and then spraying the composite powder on the alloy bonding layer by using a plasma spraying method to form a composite ceramic coating containing vertical cracks; preparing a YSZ precursor sol; coating the YSZ precursor sol on the surface of the composite ceramic coating containing vertical cracks, allowing the YSZ precursor sol to penetrate into the cracks, and then performing heat treatment to convert the YSZ precursor sol into solid YSZ to fill the cracks, so that a dense heat-resistant salt-corrosion YSZ-based composite ceramic coating is obtained. The composite ceramic coating structure simultaneously has high thermal cycle stability and high heat-resistant salt corrosion, significantly improves the service life of the coating, and is suitable for being used as a thermal barrier coating of a high-performance required hot end component.

A sprayed film including a film surface in which a value of an area ratio S / A obtained by dividing a surface area S (μm2) of a portion of the measurement surface (S-L surface) of the film surface within one evaluation region by an area A (μm2) of a portion of a reference surface forming a plane located at an arithmetic average height of the measurement surface (S-L surface), which is within the evaluation region is 1.75 or more and 3 or less, and a surface roughness Sa of a portion of the measurement surface (S-L surface) within the evaluation region is 0.4 μm or more and 8 μm or less.Generation of particles which is caused by cracks of the sprayed film can be reduced when dry etching using gas plasma is performed with a semiconductor manufacturing apparatus or the like using the sprayed film as a corrosion-resistant film.

The application relates to the technical field of alloy materials, and discloses a high-temperature-resistant ternary nickel-based titanium-niobium alloy with a service temperature of 2500 DEG C and a preparation method thereof, which takes nickel, titanium and niobium as core components, and the atomic percentage composition is as follows: 44-46% of nickel, 43-45% of titanium and 9-11% of niobium; and 0.1-0.5% of one or more trace elements of oxygen, aluminum and chromium can be further added. Through optimization of component design, the alloy is thermodynamically stable under an ultrahigh-temperature environment of 2500-2900 DEG C. The preparation method adopts vacuum consumable arc melting or electron beam melting (vacuum degree >= 10 ‑3 Pa), melting, and solves problems such as component segregation and poor machining performance. The alloy is suitable for aerospace and nuclear industry ultrahigh-temperature parts, and the process is stable and easy to mass-produce.

The present disclosure provides a thermal barrier coating powder and a preparation method thereof, and a thermal barrier coating, and relates to the technical field of high-temperature protective coating materials. The method comprises: performing mechanical-chemical grinding and surface hydroxylation treatment on a MAX phase powder; dispersing an activated MAX phase core in a liquid phase, uniformly coating a YSZ precursor on the surface of the core through double titration co-precipitation to obtain a core-shell structure precursor slurry; performing microwave hydrothermal treatment to in-situ crystallize the YSZ precursor to form a YSZ shell layer on the surface of the MAX phase core, thereby obtaining a core-shell structure unit; the core-shell structure unit has a core-shell structure composed of a MAX phase core and a YSZ shell; performing post-treatment and spray drying on the core-shell structure unit to obtain a thermal barrier coating powder; and the powder is obtained by agglomeration of multiple core-shell structure units. The interface between the core and the shell of the powder obtained by the method is firmly combined, can provide oxidation protection for the inner core of the MAX phase in coating preparation processes such as thermal spraying, and significantly improves the fracture toughness and thermal shock resistance of the thermal barrier coating.

This invention relates to a method for controlling the deformation of thin-walled, weakly rigid parts manufactured by additive manufacturing during thermal spraying. Belonging to the field of thermal spraying technology, it solves the technical problem of deformation occurring during the thermal spraying coating preparation process of thin-walled, weakly rigid parts with large residual stress, affecting assembly. The method for controlling the deformation of thin-walled, weakly rigid parts manufactured by additive manufacturing during thermal spraying includes the following steps: S1, detecting and processing the residual stress of the part; S2, designing and processing a thermal spraying shaping fixture; S3, assembling the fixture and part and then sandblasting; S4, performing stress-relief annealing on the part; S5, performing vibration aging stress relief on the part; S6, conducting a second residual stress detection and data processing on the part, and then calculating the residual stress change rate; S7, assembling the fixture and part and then performing plasma spraying; and S8, post-treatment after plasma spraying. This invention improves the surface accuracy of the part after plasma spraying and avoids assembly step differences.

The application relates to the technical field of surface strengthening of mechanical parts, in particular to a plasma spraying cylinder sleeve and a preparation process thereof. The preparation process comprises the following steps: honing the inner hole of the cylinder sleeve to obtain a honed cylinder sleeve; using a pulse plasma generator to pretreat the inner hole surface of the base body of the honed cylinder sleeve; fixing the cylinder sleeve, introducing a combustible gas mixture into an explosion chamber, initiating the mixture to generate a plasma pulse flow, and performing a scanning treatment on the inner hole surface of the cylinder sleeve to obtain a pretreated cylinder sleeve; performing supersonic plasma spraying on the inner hole surface of the pretreated cylinder sleeve, heating a ceramic and alloy compound to a molten state, spraying the ceramic and alloy compound onto the inner hole surface of the pretreated cylinder sleeve, and polishing to obtain a plasma spraying cylinder sleeve. The plasma spraying cylinder sleeve and the preparation process thereof have the advantages that the preparation process is simple, the prepared plasma spraying cylinder sleeve has high hardness, and the coating has high adhesion.

The present invention relates to a work roller for rolling metal articles, particularly for rolling metal strips, wherein the work roller has - a base body made of metal, and - an abrasion protection layer disposed at least partially on the base body, the abrasion protection layer being a thermal spray protection layer, and the abrasion protection layer having a thickness of 70 μm or less, preferably 40 μm or less, and particularly preferably 15 μm or less.

This invention relates to a titanium alloy artificial joint with a high-toughness, ultra-wear-resistant ceramic coating and its preparation method. The titanium alloy artificial joint includes a titanium alloy artificial joint substrate fabricated by 3D printing. The joint surface of the titanium alloy artificial joint substrate is coated with an alumina-based ceramic coating. The alumina-based ceramic coating is obtained by plasma spraying of a mixed powder of alumina, zirconium oxide, and rare earth oxides, and then polished to a surface roughness Ra of no more than 0.05 μm. The bone-bonding surface of the titanium alloy artificial joint is formed into a porous structure layer by 3D printing. Compared with the prior art, the titanium alloy artificial joint of this invention has excellent wear resistance and toughness, and can be personalized based on precise imaging data of the patient's bones.

A polymer-metal composite includes localized pre-preparation of a metal-containing substrate that includes forming, on the contact surface thereof, a set of salient asperities that are distributed chaotically or regularly with an area density of from 50 to 1000 asperities / mm2. In profile, asperities are in the form of protuberances and recesses with shaped contours and a maximum cross-sectional dimension of from 20 to 100 microns, the walls of the majority of protuberances and recesses being oriented at an angle of 45-90° to the contact surface. A polymeric mass is applied in a partially melted state and with a thickness of not less than 10 microns to the salient asperities with a bonding portion of said polymeric mass penetrates between the salient asperities, covering the exterior thereof and, by virtue of fluidity, occupying the vacant spaces of the pre-prepared protuberances and recesses.

This invention belongs to the field of electric heating technology, specifically relating to an axial straight-slot electric heating element based on a non-metallic heating material and its preparation method. It includes an electric heating element body with a straight slot. The two side walls of the slot serve as the positive and negative electrodes of the electric heating element, respectively. Several high-temperature resistant ceramic gaskets are inserted into the slot in a pluggable manner, filling the gaps between the slots. A sealing ceramic ring is fitted on the top of the electric heating element body. A metal conductive sheet is connected to the top end face of the electric heating element body, and an insulating sleeve is fitted over the metal conductive sheet. The metal conductive sheet is connected to an external wire. The beneficial effect of this invention is that by embedding high-temperature resistant ceramic gaskets, the positive and negative electrodes of the electric heating element are effectively physically isolated, eliminating the risk of short circuits caused by structural deformation of the electric heating element after long-term operation at high temperatures.

This application discloses a conductive ceramic evaporation boat for reducing sputtering, belonging to the field of vacuum coating. It includes a body with an evaporation tank for placing aluminum wires. Several guide channels are formed on the sidewall of the body near the evaporation tank, extending along the width of the body and penetrating it. A baffle is installed inside the evaporation tank, co-sintered with the body and surrounding it. An isolation groove is formed around the baffle on the body, located between the isolation groove and the evaporation tank. Both the working surface of the body and the baffle are coated with insulating material. The working surface of the body includes the evaporation tank, the guide channels, and the isolation groove. The baffle has slots for facilitating the backflow of molten aluminum in the isolation groove. This application effectively solves the problem of aluminum sputtering due to conductive boiling of molten aluminum.

The application discloses a feeding and heating remote control system for manufacturing nano metal powder, which comprises internet, a switch, and a server computer, and is characterized in that the system further comprises a metal material feeding device, a client APP, a single-chip microcomputer controller, a radar liquid level meter, an infrared thermometer, a high-frequency generator, a plasma power supply, and a high-temperature evaporation device; the server computer comprises CPU programming software and nano metal powder feeding and heating automatic control software; the client APP is a nano metal powder production feeding and heating remote control software, and a control interface of the client APP comprises plasma heating control, inductance heating control, furnace temperature setting, and feeding setting; the feeding setting comprises automatic feeding and manual feeding, and the automatic feeding comprises feeding amount setting and feeding frequency setting; due to the adoption of the internet and the client APP, feeding and heating intelligentization of nano metal powder production can be realized through remote control, production personnel can be saved, occupational hazards of operating personnel under high temperature can be avoided, production cost can be reduced, and the production efficiency of the nano metal powder can be improved.

The application discloses an aluminum melt spraying reinforced film blocking plate for filter sand blasting pretreatment, which comprises a base layer and an aluminum melt spraying porous rough coating, the aluminum melt spraying porous rough coating is arranged on the upper surface of the base layer, the thickness of the aluminum melt spraying porous rough coating is 150-250 mu m, the porosity of the aluminum melt spraying porous rough coating is 8-12%, and the surface roughness of the aluminum melt spraying porous rough coating is 100-150 mu m. The aluminum melt spraying porous rough coating forms a porous rough coating on the surface of the base layer through an aluminum melt spraying process, which is a porous rough structure formed by high-speed atomization deposition of molten aluminum, can be closely attached to the working surface of the base layer, is combined with the base layer through mechanical engagement, is used for grabbing sand blasting dust to prevent the sand blasting dust from falling off and anchoring a redundant film layer of a plated film, can effectively solve the problem that the dust is easy to fall off, and thus can make sand blasting uniform, improve the adhesion of the film layer and reduce the point defect rate.