1018 results about "Ceramic coating" patented technology

The invention discloses a lithium battery diaphragm with a self-repairing function and a preparation method thereof, and belongs to the field of lithium battery diaphragms. The lithium battery diaphragm comprises a polymer base membrane and a ceramic coating, the ceramic coating is coated on one side surface, facing the negative electrode, of the polymer base membrane or two side surfaces of the polymer base membrane; the ceramic coating comprises the following raw materials in parts by mass: 40-50 parts of modified ceramic particles, 4-8 parts of self-repairing microcapsules, 0.5-3 parts of a dispersing agent and 50-60 parts of water; the surfaces of the modified ceramic particles are grafted with amino-phenylboronic acid difunctional silane; chitosan / polyurethane is used as a wall material of the self-repairing microcapsule, and polyisocyanate is used as a core material of the self-repairing microcapsule. When the lithium ion diaphragm is stressed or punctured by dendritic crystals, the polyisocyanate can be released to react and crosslink, the generated cracks are closed, and an ion channel is reconstructed. Through the physical barrier of the ceramic coating and the self-repairing effect of the self-repairing microcapsule, the mechanical strength and the ion transmission performance of the lithium battery diaphragm can be effectively maintained.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention relates to the technical field of spaceflight material forming, in particular to a tension control winding process of a spaceflight carbon fiber composite launch canister, which comprises pretreatment, winding forming, curing and post-treatment. The method comprises the following steps: S1, coating a release agent and a modified coating after processing a core mold, carrying out plasma treatment and eliminating stress; the carbon fiber filaments are soaked in resin containing nanometer components, and are pre-stretched after a hot melting reaction; s2, closed-loop tension control is conducted, winding is conducted according to segmented angles, and modified resin is coated between layers to be overlapped in a crossed mode; s3, stepwise heating and curing, dynamically regulating the pressure and introducing inert gas; and S4, polishing after hydraulic demolding, carrying out sand blasting, carrying out transition layer and ceramic coating, and carrying out multi-dimensional detection. According to the process, the mechanical property and environmental adaptability of the launch canister are improved, the process precision is high, defects are reduced, the forming time is shortened, the rework rate and cost are reduced, the spaceflight requirement is met, and the process is suitable for batch production.

The invention belongs to the technical field of asphalt stirring, and discloses an asphalt stirring device based on road and bridge pothole filling, the asphalt stirring device comprises a base, a stirring and scraping mechanism is arranged above the base, the stirring and scraping mechanism comprises a mixing tank, asphalt is fully stirred through the stirring and scraping mechanism, and through a sleeve in the stirring and scraping mechanism, the stirring and scraping mechanism is driven to rotate; according to the double-shaft driving design of the rotating pipe, an efficient and synergistic stirring and scraping system is constructed, the inclined face of an arc-shaped scraping plate is attached to the inner wall of the mixing tank and matched with a wear-resistant ceramic coating, adhered asphalt is scraped in real time in the rotating process, meanwhile, the rotating pipe synchronously rotates, radial stirring is achieved through external stirring blades of the rotating pipe, and a spiral lifting piece pushes bottom asphalt to axially flow; by matching with the turbulent flow effect of the U-shaped heat conduction pipe, the asphalt forms a three-dimensional flow field in the tank, an auxiliary agent and the asphalt are fully fused, the problem of non-uniform mixing caused by traditional single-dimension stirring is solved, the stable performance of the asphalt is guaranteed, and a basic support is provided for crack resistance and water damage resistance after pavement filling.

The invention discloses a method for preparing an ultrahigh-temperature ceramic coating by an ultrahigh-temperature metal gas source based on a molten salt medium, which comprises the following steps of: mixing low-melting-point salt A, metal fluoride and metal M to obtain a mixture C, putting the mixture C into a first crucible, mixing low-melting-point salt B and metal M to obtain a mixture D, putting the mixture D into a second crucible, putting a carbon base material into a deposition furnace, and performing vacuum drying to obtain the ultrahigh-temperature ceramic coating. Heating the first crucible to melt the mixture C to obtain a melt E, and heating the second crucible to melt the mixture D to obtain a melt F; carrier gas is guided into the first crucible, the carrier gas flow passes through the melt E to form gas flow containing a metal gas source, the gas flow containing the metal gas source is guided into the second crucible, and the gas flow containing the metal gas source is filtered by the melt F in the second crucible to form a pure metal reaction gas source, and finally, a pure metal reaction gas source is introduced into the deposition furnace for deposition of the carbon base material, and the ultra-high-temperature ceramic coating is obtained. The method is easy to operate and low in cost.

The invention provides a battery and an electric device. A positive plate comprises a positive active material, and the positive active material is doped and / or coated with a lanthanum element; the surface of the diaphragm is coated with a ceramic coating; the electrolyte comprises a first solvent, a second solvent, a first additive and a second additive; the first solvent comprises a cyclic carbonate compound, the second solvent comprises a chain fluorosulfonamide compound, the first additive comprises mannitol carbonate sulfate, and the second additive comprises succinonitrile; the lanthanum element is doped / coated on the positive active material, so that the release of lattice oxygen at high voltage or high temperature can be effectively inhibited, and the exothermic reaction activity at the thermal runaway initial temperature is reduced; the first additive and the second additive in the electrolyte respectively form a compact CEI film and an SEI film with high thermal stability on the surfaces of the positive electrode and the negative electrode; the diaphragm ceramic coating provides a physical barrier, the thermal shrinkage temperature of the diaphragm is increased, and internal short circuit is prevented.

The invention belongs to the field of electronic display film materials, and discloses a UV optical film material and a manufacturing method and application thereof.The UV optical film material comprises a base material, a frosted layer, an inner protective film layer, an optical ink layer, a transparent adhesive layer and an outer protective film layer, and the inner surface of the base material is sequentially coated with the frosted layer and the inner protective film layer outwards; the outer surface of the base material is sequentially coated with an optical ink layer, a transparent adhesive layer and an outer protective film layer outwards; the coating process comprises the steps that the viscosity of UV optical ink is controlled to be 16 ''-18'', the outer surface of the base material is coated with the UV optical ink through a precise micro-concave ceramic coating roller, and then UV curing is conducted to form an optical ink layer; coating a transparent adhesive layer on the surface of the optical ink layer, and after curing, coating UV optical transfer adhesive on the inner surface of the base material to form a frosted layer; finally, the surface of the frosted layer and the surface of the transparent adhesive layer are coated with an inner protective film layer and an outer protective film layer respectively. The coating has the characteristics of high hardness and high adhesive force, the surface can be kept uniform, the edge sharpness is high, and discoloration can be effectively prevented.

The invention provides a high-speed laser cladding metal ceramic coating, a cast iron brake disc and a preparation method and application of the cast iron brake disc. The high-speed laser cladding metal ceramic coating comprises the following preparation raw materials in percentage by mass: 40%-60% of stainless steel, 10%-20% of SiC, 10%-30% of ZrO2, 5%-10% of Ti and 1%-2% of CeO2. According to the coating, the hardness, the wear resistance, the friction coefficient and the toughness of a cast iron matrix can be remarkably improved, and the braking requirement of a motor vehicle under the extreme working condition can be well met. The invention further provides the cast iron brake disc and a preparation method and application thereof.

The invention discloses a water-based poly-ceramic coating material as well as a preparation method and application thereof. The formula comprises a composite base material (40-45 parts of modified waterborne polyurethane resin and 15-20 parts of a waterborne acrylic emulsion), a synergistic curing system (10-12 parts of a blocked isocyanate curing agent and 0.8-1.2 parts of a latent organic zinc salt accelerant), an organic-inorganic reinforced phase (10-15 parts of nano silicon dioxide and 8-10 parts of polysilazane) and a functional aid. The base material and the cosolvent cooperate to make VOCs less than or equal to 30 g / L, a curing system cooperates to realize low-temperature rapid curing, organic-inorganic components cooperate to form a poly-ceramic structure, the coating is adaptive to an existing roll aluminum production line, and the problems of environmental protection, energy conservation and performance of a traditional coating are solved.

The invention belongs to the technical field of battery manufacturing, and particularly discloses a diaphragm with a gradient structure and a preparation method of the diaphragm. The diaphragm with the gradient structure comprises a diaphragm base membrane and a coating layer, the coating layer comprises ceramic coatings with different particle size ranges, and the two faces of the diaphragm base membrane are coated with ceramic particles A with the particle size D50 smaller than or equal to 100 nm and ceramic particles B with the particle size of 200-400 nm respectively. According to the diaphragm with the gradient structure, the porosity on the side close to the positive electrode is small, the porosity on the side close to the negative electrode is large, and therefore a smoother lithium ion transmission channel can be formed on the negative electrode side of the diaphragm, and the requirement for high lithium ion flux is met.

The application belongs to the technical field of surface modification, and discloses a method for constructing a ceramic-based self-lubricating, high-wear-resistant and strong-corrosion-resistant coating based on thermal spraying technology and application. The method uses a thermal sprayed ceramic coating as a template, introduces a solid-liquid reversible lubricating phase, and after being heated and melted, the solid-liquid reversible lubricating phase is penetrated into inherent pores and micro / nano cracks in the ceramic coating through a vacuum impregnation process, and is solidified and retained in the defects after cooling, so that a new ceramic-based self-lubricating and strong-corrosion-resistant composite coating is finally obtained. The preparation method is simple, fast and efficient, and does not affect the mechanical properties of the ceramic coating, and the ceramic-based self-lubricating and strong-corrosion-resistant composite coating has low friction coefficient and excellent wear resistance and corrosion resistance.

The application discloses a kind of low thermal conductivity high reflectivity five-element co-doped ceramic laser protection coating and preparation method thereof, belong to high-energy laser protection technical field.The protective coating includes the adhesive layer and the reflective heat insulation layer of laminated arrangement, adhesive layer is arranged on the surface of base material, reflective heat insulation layer is arranged on the surface of adhesive layer;Wherein, adhesive layer is formed by spraying one of Ni-Al self-bonding powder, Ni-Mo-Al, NiCrAlY, CoCrAlY and NiCoCrAlY;Reflective heat insulation layer is the ceramic coating of five-element co-doped ZrO2, in ceramic coating, base element is ZrO2, doping component is:Y2O3, Gd2O3, Yb2O3, TiO2 And Ta2O5, after doping, material is single cubic phase structure at 25 ℃-1600 ℃.By multiple oxide doping to ZrO2, the coating can maintain cubic phase at room temperature while having lower thermal conductivity and higher reflectivity, can solve the problems of oxidation reflectivity reduction of metal material, mass loss of ablation material and insufficient heat insulation capacity of heat insulation material in laser protection field, prolong service life.

The invention relates to a method for preparing a diffusion bonding layer on a nickel-based alloy and YSZ ceramic coating interface, and belongs to the technical field of metal material surface protection and ceramic coatings. According to the preparation method, a YSZ composite ceramic coating is deposited on the surface of the nickel-based alloy by adopting an electrophoretic deposition method, and then an MCr2O5 (M is Zr, Y, Ce, Yb and Al) diffusion bonding layer is prepared on the interface of the nickel-based alloy and the YSZ composite ceramic coating by adopting a pressureless discharge sintering and thermal diffusion treatment method. The bonding layer prepared through the diffusion method is good in interface bonding, the thermal stress between the nickel-based alloy and the YSZ ceramic coating is effectively buffered, the defects that a bonding layer prepared through a traditional method is large in pore impurity amount and the like can be overcome, and the bonding force between the ceramic coating and a base body and the high-temperature anti-oxidation and anti-stripping performance are remarkably improved.

The invention belongs to the technical field of thermal power heating surface treatment, and provides a boiler heating surface high-temperature corrosion protective coating and a preparation method thereof in order to solve the technical problems that in the prior art, a nano ceramic coating and a metal alloy coating for treating thermal power boiler heating surface high-temperature corrosion are insufficient in adhesive force, prone to falling off and short in protection service life. Through multi-layer structure design and technological parameter optimization, a coating system has continuous thermal expansion coefficient gradient distribution in the interval of 500-900 DEG C, the metal bonding layer at the bottom layer has a pore structure which can effectively absorb thermal stress, the nano ceramic layer at the surface layer can maintain high-temperature stability, and it is verified that the overall bonding strength is larger than or equal to 35 MPa, and the thermal expansion coefficient is larger than or equal to 10%. Compared with a traditional single-layer coating, the adhesive force is improved by 200% or above, and therefore the technical problems that in the prior art, adhesive force is insufficient, thermal stress is not matched, and high-temperature softening fails can be effectively solved.

The invention provides a preparation method of a hard nitride ceramic coating on the surface of a magnesium alloy, and belongs to the technical field of magnesium alloy coatings. According to the method, intermittent plasma flow is formed by controlling intermittent discharge of a cathode target in the PVD process, heat accumulation generated by continuous bombardment of matrix-coating interface ions is reduced by regulating and controlling the discharge / arc extinguishing period of the target, so that thermal expansion of the matrix-coating interface is reduced, and the thermal conductivity of the matrix-coating interface is improved. And growth defects (pores and cracks) caused by thermal expansion difference between the nitride ceramic coating and the substrate are reduced, and the method has a good industrial application prospect.

According to an aspect of the present invention, there is provided a method for manufacturing a secondary battery, the method including: preparing an electrode assembly in which electrodes and a separator are alternately laminated, and an adhesive is applied to the surface of at least one among the electrodes and the separator, thereby allowing the electrodes and the separator to adhere to each other; accommodating the electrode assembly in a battery case; injecting a gel polymer electrolyte composition into the battery case to impregnate the electrode assembly with the gel polymer electrolyte composition; and curing the gel polymer electrolyte composition, wherein the adhesive includes a first oligomer compound, the separator includes a porous substrate and ceramic coating layers disposed on both surfaces of the porous substrate, the ceramic coating layers include 92-100 wt % (exclusive of 100) of inorganic particles and 0-8 wt % (exclusive of 0) of a binder, and the gel polymer electrolyte composition includes a lithium salt, an organic solvent, a polymerization initiator, and a second oligomer compound.

A hip implant system includes an artificial acetabular cup and an artificial acetabular liner. The liner includes or consists of a metal or an alloy, and is coated at least in sections with a ceramic coating.

The invention discloses a high-density ceramic coating and a preparation method thereof, and relates to the technical field of polymer coatings, the high-density ceramic coating comprises, by mass, 33-35 parts of silica sol, 43-45 parts of a solvent, 0.35-0.42 part of a weak acid buffer agent and 18.5-19.9 parts of an auxiliary agent; wherein the solvent is prepared from the following components in parts by mass: 25.5 to 26.5 parts of MTMS, 0.5 part of deionized water and 16 to 19 parts of ethanol; the silica sol comprises 25.5-26.5 parts by mass of 45nm SiO2 sol and the balance of 15-20nm SiO2 sol, and the SiO2 sol is modified silica sol which is loaded by a metal organic framework or is subjected to in-situ growth of graphene quantum dots. The wear-resistant and high-temperature-resistant valve has the effects of wear resistance, high temperature resistance and long service life.

The invention discloses high-temperature-resistant ceramic coating slurry and application thereof, and relates to the technical field of secondary batteries, the high-temperature-resistant ceramic coating slurry comprises ceramic particles, a PAA binder, a composite emulsion, a wetting agent and water as a solvent; the addition mass ratio of the ceramic particles to the PAA binder to the composite emulsion to the wetting agent is 1: (0.5-2): (5-10): (0.05-0.2); the adding mass percentage of the ceramic particles is 30-50%. The heat resistance of the prepared ceramic coating is remarkably improved, so that the effect of improving the use safety of the battery is achieved. Based on the corresponding components, the obtained ceramic coating forms a heat-resistant PAA framework and a composite body which are mixed to coat ceramic particles, and the effect of remarkably improving the heat resistance is further achieved.

The invention discloses metal ceramic MAX-phase composite powder for spraying and a preparation method of the metal ceramic MAX-phase composite powder, and belongs to the field of metal ceramic composite materials. The method comprises the following steps: mixing Ni powder, Cr powder and Cr2AlC nano powder with deionized water, a binder and a dispersant according to a specific ratio, and carrying out wet ball milling to prepare uniform slurry; carrying out spray granulation to obtain primary spherical powder; and finally, carrying out spheroidizing treatment on the primary powder by adopting radio frequency plasma under the protection of inert gas to obtain a final product. The core of the preparation method is that through an optimized two-step process, many limitations in the application aspect of an existing MAX phase material are solved, and the composite powder which is high in sphericity degree, good in flowability, compact in interior and stable in MAX phase component is successfully prepared. The powder can be directly used for thermal spraying, and an ideal raw material is provided for preparing a high-performance MAX-phase metal ceramic coating.

The invention discloses an automatic spraying robot system for an anti-oxidation functional ceramic coating of a prebaked anode carbon block. The automatic spraying robot system comprises a dust removal chamber, a bottom spraying chamber, a flash drying chamber, a spraying chamber and a drying chamber which are sequentially connected end to end and communicate with one another through communicating openings. A feeding port is formed in the dust removal chamber, a discharging port is formed in the drying chamber, and the dust removal chamber, the bottom spraying chamber, the flash drying chamber, the spraying chamber and the drying chamber are jointly provided with a feeding assembly. A bottom spraying assembly is arranged in the bottom spraying chamber, a quick-drying spray head is arranged on the flash drying chamber in a penetrating and inlaying mode, an industrial robot is arranged in the spraying chamber, a spray nozzle is fixedly connected to the tail end of the industrial robot, and a plurality of hot air blowers are arranged on the drying chamber in a penetrating and inlaying mode. Full-dimensional dead-corner-free cleaning of the carbon blocks is achieved, stubborn dust is efficiently removed, no extra power exists, different conveying speeds are adapted, and a foundation is built for follow-up spraying.

The invention discloses a high-toughness anti-fatigue high-pressure-resistant seamless steel tube and a gradient preparation method thereof, and relates to the technical field of metal material processing. The seamless steel tube forms a performance gradient from the inner wall to the outer wall in the wall thickness direction; the seamless steel pipe sequentially comprises a ferrite-pearlite structure layer, a transition structure layer and a tempered martensite structure layer from the inner wall to the outer wall, a Fe4N nitride layer and a Ni-Ti alloy layer are arranged on the inner wall, and a reinforced surface layer is formed on the outer wall through ceramic coating treatment. According to the seamless steel pipe, the performance gradient is formed along the wall thickness, the inner wall has high toughness and corrosion resistance, and the outer wall has high strength and fatigue resistance and adapts to complex working conditions; the gradient preparation method solves the problems that a traditional technology is large in heating temperature difference, uneven in rolling deformation, asynchronous in heat treatment phase change and the like, the comprehensive performance is improved, the technology is based on the prior art, the improvement cost is low, and industrial production is facilitated.

The present disclosure relates to the formation of thermal protection systems based on the formation of ceramic coatings. Such ceramic coatings may be derived from polymeric resins and may be applied over carbon-carbon (C / C) composites. The ceramic coatings may optionally contain a metal carbide coating.

The invention provides a diaphragm combined ceramic coating, a coated diaphragm and a preparation method. The diaphragm combined ceramic coating comprises a diaphragm base membrane, a first coating, a second coating and a third coating, the first coating is coated on the surface of the diaphragm base membrane; the second coating is coated on the surface of the first coating; the surface of the second coating is coated with the third coating; the first coating and the second coating comprise one or more ceramic particles; the third coating comprises one or more organic polymer materials; the thickness range of the first coating is 0.2-2 microns; the thickness range of the second coating is 1-5 microns; the thickness range of the third coating is 0.5-3 microns; the ceramic particles are non-spherical particles, and in practical application, the self-discharge of a battery cell can be reduced, and the porosity of the battery cell can be improved, so that the liquid retention effect of the diaphragm is improved, and the electrical performance and the safety performance of the battery are improved.

The invention provides an anti-oxidation and ablation-resistant ceramic coating on the surface of a C / C composite material and a preparation method, and belongs to the technical field of thermal protection coatings. The anti-oxidation and ablation-resistant ceramic coating on the surface of the C / C composite material comprises a bottom bonding layer, a middle heat insulation layer and an external ablation-resistant layer, the bottom bonding layer is SiC-SiCf, the middle heat insulation layer is modified ZrO2, and the external ablation-resistant layer is HfC-ZrC-SiCf. According to the method, the SiC-SiCf / modified ZrO2 / HfC-ZrC-SiCf composite ceramic coating is prepared on the special-shaped part through dipping and brushing methods, the method is easy and convenient to operate, few in material consumption and low in cost, and the performance meets the specific use requirement.

The invention discloses a laser cladding high-entropy alloy carbide ceramic coating and a preparation method thereof, and belongs to the technical field of high-entropy alloy coatings. A laser cladding technology is adopted, a matrix and high-entropy alloy-phenolic resin composite powder are subjected to in-situ melting through a high-energy laser beam, firm metallurgical bonding between the coating and the matrix is achieved, elements at an interface are in gradient transition, and the shear strength exceeds 100 MPa. The single-layer deposition thickness can reach more than 500 microns and can reach the centimeter level through multi-layer accumulation, so that the coating thickness capability is remarkably improved; the prepared coating is high in compactness, the porosity is lower than 5%, and the key technical contradiction that the thickness and the compactness cannot be synergistically optimized in traditional thermal spraying is effectively solved. Besides, the in-situ carbonization reaction under the methane atmosphere is innovatively adopted, the complex high-temperature synthesis process of traditional high-entropy carbide powder is avoided, the preparation cost is greatly reduced, the preparation period is greatly shortened, and the method has the remarkable advantages of being efficient, low in cost and high in performance.

The invention discloses a gradient preparation method of a compact barrier type rare earth ceramic coating, and belongs to the technical field of high-temperature protective coatings. The preparation method comprises the following steps: pretreating a tungsten electrode substrate; sequentially preparing a sensor layer integrated with a distributed optical fiber sensor, a gradient transition layer which is realized by adopting a four-channel synchronous powder feeding technology and has continuous and gradual components, and a self-adaptive layer which is prepared by adopting a laser-induced in-situ synthesis technology and contains high-entropy rare earth zirconate and an intelligent additive; the self-healing layer contains a triple temperature triggering microcapsule system; and finally, post-processing and function activation are carried out. The prepared coating forms an intelligent response type gradient composite structure from inside to outside, has excellent interface bonding strength, thermal shock resistance and high-temperature chemical stability and has damage self-healing and service state real-time monitoring functions, and the service life of the tungsten cathode under the severe working condition is remarkably prolonged.

A sliding arrangement for use in an internal combustion engine is described, comprising a cylinder liner (1) and at least one piston ring (10), wherein the liner (1) has a through-bore defining an inner surface (S) which in turn defines three sections: a first section (2) near the end of the piston stroke, facing the cylinder head (at top dead center, TDC); a second, middle section (3); and a third section (4) near the end of the piston stroke, facing the crankshaft of the engine (at top dead center, TDC), wherein (i) the TDC section (2) of the liner (1) has a surface finish with a first roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”); the middle section (3) of the liner (1) has a surface finish with a second roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”);(1) the BDC section (4) of the cylinder liner (1) has a surface finish with a third roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”), and the roughness value of the middle section (3) is significantly lower than the roughness value of the TDC section (2), and is defined by an essentially very smooth structure of recesses and projections (“valleys” and “raised areas”); and (ii) a ceramic coating (R) is applied to at least part of the contact surface of the piston ring (10) by the physical vapor deposition (PVD) process.

The invention relates to the technical field of large steel casting manufacturing, and discloses a crusher rack set for mining machinery and a casting method of the crusher rack set. The rack set comprises a cast steel body and a functional gradient reaction framework which is arranged in the cast steel body in advance and forms metallurgical bonding. The framework is made of refractory metal alloy, and an A area and a B area are divided on the framework. The area A is arranged at the heat accumulation core of the casting and is provided with a strong reaction coating on the surface; the area B extends outwards from the area A, and the surface of the area B is provided with a high-thermal-conductivity ceramic coating. The method comprises the steps of preparing the framework, installing the framework in a casting mold cavity, and then carrying out molten steel pouring and heat treatment. In-situ forced nucleation is initiated at the core of the casting through the strong reaction coating of the area A, a heat conduction path from inside to outside is established by means of the high heat conduction coating of the area B, and sequential solidification of the casting is achieved, so that defects such as shrinkage porosity and shrinkage cavities are effectively transferred, the density and uniformity of the internal structure of the casting are improved, and the casting quality is improved. And the overall mechanical property of the rack set is improved.

The invention relates to the technical field of metal surface protection materials, in particular to a wear-resistant anticorrosive coating based on a nano-composite technology and a preparation method thereof, which are suitable for surface protection of metal pipelines and equipment in harsh environments such as chemical equipment, ocean engineering, electric power facilities and the like. The invention relates to a high-temperature-resistant flame-retardant coating which comprises the following raw material components in parts by weight: 20-30 parts of nano aluminum oxide; 10 to 15 parts of nano titanium oxide; 1 to 3 parts of graphene; 1-3 parts of a composite filler; 3-5 parts of a silane coupling agent; 40 to 50 parts of modified epoxy resin; 10-15 parts of a curing agent; 5-8 parts of a toughening agent; 2-4 parts of an anti-wear agent; and 0.5-1 part of a leveling agent. Under the combined action of all the components, the obtained wear-resistant and corrosion-resistant nano composite ceramic coating for the metal surface has excellent high temperature resistance, corrosion resistance, wear resistance, aging resistance and bonding strength.