175results about How to "Prevent peeling" patented technology

The invention provides a ferronickel-based oxygen evolution electrode and a preparation method thereof based on interface confinement. The preparation method of the ferronickel-based oxygen evolution electrode comprises the following steps: preparing a precursor solution containing ferrous ions and ferric ions; the foamed nickel substrate is cleaned; the cleaned foamed nickel is tightly attached to the surface of the bottom of the reaction container, the foamed nickel is immersed in the precursor solution, under the room-temperature standing condition, divalent and trivalent iron ions are induced to be subjected to a synergistic hydrolysis and coprecipitation reaction through a physical interface confinement space formed by an attached interface, and the nickel-based composite material is obtained. Therefore, a high-activity and high-uniformity nickel-iron-based (oxygen) hydroxide catalyst layer (DIC-NiFeOOH / NF) is grown on the surface of the foamed nickel in situ. The method is simple in process, green and energy-saving, and the prepared nickel-iron-based oxygen evolution electrode shows excellent performance in oxygen evolution reaction and anion exchange membrane water electrolysis.

The application belongs to the technical field of heat insulation films, and discloses a polyester-based explosion-proof heat insulation composite film and a preparation method and application thereof. The explosion-proof heat insulation composite film is a composite film with a layered structure. The layered structure comprises a sandwich heat insulation film, an anti-scratch layer and a mounting adhesive layer arranged on both sides of the sandwich heat insulation film. The sandwich heat insulation film is composed of a first polyester film, a second polyester film and a heat insulation layer sandwiched between the first polyester film and the second polyester film. In the heat insulation coating liquid, chlorinated polyolefin is used to increase the bonding adhesion and leveling dispersibility of the coating liquid on the polyester film, so that the coating type sandwich heat insulation film has excellent tear resistance and peeling resistance. The defects of the current coating type heat insulation film, such as easy blistering, heat insulation performance attenuation and reduced explosion-proof performance, are solved. The coating preparation process is simple and does not require a complex magnetron sputtering process, so that the cost of the explosion-proof heat insulation film is scaled and the production is realized.

This invention discloses a deep defluorination agent and its application method, specifically relating to the field of defluorination agents (GMS-FS series products). It includes a valence-state switching active phase, a reaction interface building component, a dynamic electronic regulation component, and a structure adjustment and protection component. The valence-state switching active phase provides a reversible valence-state transition reaction center, achieving specific capture of fluoride ions through an electron trapping effect when interacting with them. The reaction interface building component forms a polar gradient interface layer on the surface of the defluorination agent, guiding fluoride ions to migrate towards the active center and locally enrich them, thereby improving defluorination efficiency. By constructing a rare metal valence-state switching active phase with La2O3 and UO2 as its core, combined with a polar gradient interface guiding layer and a dynamic electronic regulation mechanism, preferential migration and specific capture of fluoride ions are induced in a multi-ion coexistence environment, achieving stable deep defluorination under high salinity and highly competitive ion conditions.

The invention provides a rotor surface treatment process, and relates to the technical field of surface treatment.The rotor surface treatment process is characterized in that a coating sequentially comprises a soft layer A, a hard layer B and a toughening layer C from a base body to the outside; the soft layer A is a metal lubricating composite layer formed by metal Mo or W and C or S with increasing content; the hard layer B is formed by metal nitride or carbonitride; a continuous component and structure gradient region is arranged between the soft layer A and the hard layer B; and the toughening layer C is a nanocrystalline-amorphous mixed structure formed by solid micro-diffusion of the hard layer B at 320-420 DEG C. Periodic micro-pits are formed in the surface of the toughening layer C and can be used for storing a lubricating medium. Through component gradient design and process hardening and tempering, the binding force, the wear resistance, the impact resistance and the stripping resistance of the coating are remarkably improved, the service life of the coating is prolonged, and the service life of the coating is prolonged. The method is suitable for high-load and high-friction working conditions such as vacuum pump rotors.

The utility model discloses a semi-flexible composite pavement structure, and relates to the technical field of road engineering, the semi-flexible composite pavement structure comprises a rigid base layer, a transition layer, a flexible surface layer and a pavement coating, and embedded parts are arranged in the rigid base layer, the transition layer and the flexible surface layer; three layers of materials are stacked and combined, embedded parts are arranged inside, a stable mechanical meshing structure which is narrow in top and wide in bottom can be formed, reflection cracks and interlayer stripping can be effectively restrained, a pavement coating sealing layer is finally coated, the service life of a pavement is remarkably prolonged, the driving comfort is remarkably improved, meanwhile, the maintenance cost is reduced, and the service life of the pavement is prolonged. The long-acting stable pavement performance combining rigidity and softness is realized.

The invention provides a nano-composite anti-seepage coating for goaf sealing and a preparation method and application thereof. The impermeable coating comprises the following components in percentage by mass: 10 to 30 percent of nano silica sol subjected to surface organic modification, 15 to 35 percent of styrene-butadiene latex subjected to pH buffer stabilization, 0.5 to 10 percent of functional nano material subjected to surface activation treatment, 20 to 60 percent of superfine sand and the balance of short fiber, inorganic powder filler and auxiliaries. The method comprises raw material pretreatment; step-by-step gradient blending is performed; and functions are compounded. According to the application, the nano-composite anti-seepage coating is applied to surrounding rock reinforcement, crack plugging or anti-seepage sealing engineering of a coal mine goaf. The slurry has the advantages of being high in deep infiltration capacity, excellent in surface film forming and internal compatibility and stable in performance, an internal infiltration reinforcing layer and a surface sealing layer can be formed at the same time after construction, and an integrated double-layer anti-seepage network is formed.

The application provides a clay anti-swelling agent composition and a preparation method and application thereof, and the clay anti-swelling agent composition comprises, in mass fraction, 5-20 wt% of polyether amine, 15-30 wt% of an organic ammonium salt, 8-16 wt% of a low-molecular-weight cationic polymer, 10-20 wt% of a polyvinylamine and 5-10 wt% of an organic acid, and the rest is water; the clay anti-swelling agent composition has the advantages of good anti-swelling effect, long-acting effect, prevention of clay particle migration, good temperature resistance, non-increase of formation water salinity, increase of formation permeability and the like, the anti-swelling rate is greater than or equal to 90%, the anti-swelling rate is greater than or equal to 92% after aging at 350 DEG C, the water washing resistance rate is 100%, the core permeability recovery rate is greater than or equal to 75%, and the core permeability retention rate is greater than or equal to 85%.

A kind of copper clad steel grounding wire is used to straightening device, it is related to copper clad steel grounding wire straightening technical field, including mounting plate and the support frame for supporting mounting plate, a group of straightening rollers for extruding grounding wire is rotationally arranged on mounting plate, and once straightening area is formed between two straightening rollers, which can be passed through by grounding wire, first sliding plate capable of sliding along the direction perpendicular to the movement direction of grounding wire is arranged on mounting plate, and another straightening roller is rotationally connected with first sliding plate;Multiple auxiliary rollers are arranged on the side of straightening roller away from the entry of grounding wire, and multiple auxiliary rollers are respectively located at the two sides of grounding wire, so that secondary straightening area is formed between the two sides of auxiliary roller of grounding wire, which can be passed through by grounding wire, multiple second sliding plates capable of sliding along the direction perpendicular to the movement direction of grounding wire are arranged on mounting plate, and second sliding plate is located at the same side with first sliding plate, corresponding second sliding plate is rotationally connected with the side auxiliary roller, and the interval between straightening rollers can be adjusted to adapt to grounding wire of different diameters.

The invention belongs to the technical field of road engineering, and discloses a concrete bridge deck pavement structure and a construction method.The concrete bridge deck pavement structure comprises a concrete base layer, the top of the concrete base layer is covered with a waterproof binder, and the top of the waterproof binder is covered with an asphalt concrete mixture; the top of the asphalt concrete mixture is covered with a stone mastic asphalt mixture; the waterproof binder adopts an asphalt binder or an epoxy resin binder; the paving thickness of the asphalt concrete mixture is 4.5 cm, and the paving thickness of the stone mastic asphalt mixture is 4 cm. By optimizing the thickness combination of the upper surface layer and the lower surface layer and improving a waterproof binder material and a forming process, light weight, durability and economization of bridge deck pavement are achieved, and the bridge deck pavement structure can be suitable for bridge engineering in high-temperature and rainy areas.

The utility model discloses a scratchproof steel roll hoisting sling and buffer protection device belongs to metallurgical product hoisting equipment technical field, scratchproof steel roll hoisting sling and buffer protection device, including main rod and ring, the ring is screwed on the top of main rod, the below of main rod is connected with riser, the below of riser is connected with the connecting seat of bolt, and the left lower corner and right lower corner position of riser are installed with conical seat respectively, through setting up by the flexible clamping structure of arc seat and arc clamp cover, realized to the full package formula, non -injury clamping of steel roll outer circumferential surface, in the hoisting process, two arc seats are driven under the four connecting rod mechanism and move inwards synchronously, and the arc clamp cover of its inside is made of flexible material (rubber), can completely adhere to the outer circumferential surface of steel roll, and this clamping mode avoids the mode of traditional sling insertion steel roll inner diameter or with metal hook, thoroughly eliminates the direct contact of metal parts and steel roll surface.

The invention discloses a test method for evaluating the crack repairing performance of self-repairing concrete, which comprises the following steps: placing an embedded steel wire mesh in concrete slurry in a pouring process to adjust the crack appearance position and crack depth, performing crack prefabrication on a concrete test piece by using the pressure of a press machine to obtain a non-penetrating crack, and then performing maintenance; a theoretical impedance model of an equivalent circuit is constructed, a complex error between theoretical calculation impedance and experimental actual measurement impedance is minimized, and an electrochemical impedance spectroscopy equivalent simulation circuit is determined by using a chi-square value smaller than 10 <-3 > order of magnitude. And finally, calculating the self-repairing rate of the concrete test piece at different ages through an impedance value of a component representing a crack part in the equivalent simulation circuit. According to the method, the universality of electrochemical equipment is improved, nondestructive testing can be carried out on the concrete crack repairing effect through different workstations, and technical support is provided for concrete crack self-repairing capacity evaluation.

The invention discloses a dry-method lithium supplement positive electrode material and a preparation method thereof, a positive electrode membrane and a preparation method thereof, and a lithium ion battery, and belongs to the technical field of lithium batteries. The dry-method lithium supplement positive electrode material comprises a positive electrode active material, a conductive additive, a polymer binder and Li6WO6, based on 100% of the total mass of the positive electrode active material, the conductive additive and the polymer binder, the mass percentage of the positive electrode active material is 80-85%; the mass percent of the conductive additive is 5-10%; the mass percent of the polymer binder is 0.5-5%; and the mass of Li6WO6 is 5-9% of the total mass of the positive electrode active material, the conductive additive and the polymer binder. When the dry-method lithium supplementing positive electrode material is used for carrying out dry-method lithium supplementing on a lithium ion battery, Li6WO6 is not easy to bond and agglomerate, the stability is high, and the lithium supplementing effect is good; the lithium ion battery containing the dry-method lithium supplement positive electrode material has excellent cycling stability and high first-circle specific capacity.

The invention discloses a TBM double-track tunnel trackless transportation cross-line bypassing cushion layer rapid construction method, and belongs to the technical field of tunnel construction. According to the method, a construction area is divided into a plurality of construction sections in the longitudinal direction of a tunnel, construction and transport vehicle framing and side alternate operation is organized, and parallel cushion layer pouring and trackless transport are achieved; the method comprises the following steps of: performing radar detection and scabbling treatment on the top surface of an inverted arch block during construction preparation; installing a steel plate water stop belt, and penetrating through the ground beam and the drainage blind pipe; a detachable steel pipe is adopted for shaping and constructing a cushion drainage ditch; after a reinforcing mesh is laid, concrete pouring, multi-pass surface finishing, steam and heat preservation curing and temperature and humidity monitoring are conducted; by optimizing the construction organization and technology, the problems that transportation is interrupted, the construction period is long and cracking is prone to occurring in a traditional method are solved, efficient, high-quality and low-interference cushion layer construction is achieved, optimal construction parameters can be scientifically screened by setting a contrast test section, and adaptability is high.

The application relates to an LED light-emitting module, an LED packaging structure and a related manufacturing method, and relates to the technical field of semiconductor light emission. Each light-emitting diode chip is packaged in advance, a plurality of annular grooves are formed in the first packaging layer, each annular groove surrounds a corresponding light-emitting diode chip, a magnetic adsorption structure is formed in each annular groove, the magnetic adsorption structure is embedded into a plurality of second grooves, the peeling of the magnetic adsorption structure can be effectively avoided, the magnetic adsorption structure is magnetized, the above magnetic adsorption structure can realize the detachable connection of the light-emitting diode chip and the circuit substrate, the printing of solder and the reflow soldering process can be avoided, the manufacturing cost is greatly reduced, and since the light-emitting diode chip and the circuit substrate are detachably connected, the removal of a defective light-emitting diode chip is facilitated, and the repair of the light-emitting module can be smoothly realized.

This invention provides a drug delivery device pad. The pad comprises an elastic outer layer, a sealing middle layer, and a leak-proof inner layer stacked sequentially, with the three layers integrally connected by heat fusion, adhesive bonding, or welding. The elastic outer layer is made of silicone or polyurethane, providing flexible cushioning to prevent relative sliding with the drug delivery device; the sealing middle layer is made of EPDM rubber or hydrogenated nitrile rubber, enhancing pressure resistance and long-term sealing performance; the leak-proof inner layer is made of fluororubber or polytetrafluoroethylene, forming an inert protective layer to block the risk of drug adsorption or oxidation. The layers are connected by an interlocking structure and a locking block-slot physical locking method, achieving double fixation and preventing peeling. This invention balances elastic deformation and structural stability, effectively solving the problems of easy deformation and damage, poor sealing performance, and drug adsorption in traditional pads, significantly improving the sealing reliability and drug protection performance of the drug delivery device.

The invention discloses an internal insulation steel pipe special cable and a four-groove roller reducing mill thereof, and relates to the technical field of cables, the cable comprises a steel pipe layer and convex ribs integrally processed on the outer surface of the steel pipe layer; the reducing mill comprises a fixing ring; the rolling assembly is rotationally installed in the fixing ring, the rolling assembly comprises a rotating ring and four rollers distributed in the rotating ring in a surrounding mode, and a gap used for extruding a steel pipe layer of the cable to form a convex rib is formed between every two adjacent rollers; and the driving assembly is used for driving the rolling assembly to rotate in the fixing ring so as to form a convex rib which extends in the axial direction and is of a linear structure or a spiral structure on the surface of the cable. According to the invention, through the relation between the revolution speed of the roller and the advancing speed of the cable, the convex ribs with axial linear structures or the convex ribs with different leads and spiral structures can be flexibly processed, the torsional strength, the heat dissipation efficiency and the installation guidance quality of the special cable in different laying environments are improved, and the customization requirements of high-end markets are met.

The invention relates to the technical field of metal material surface treatment, and discloses a vacuum coating process for a metal substrate and an anti-aging anti-corrosion film, which comprises the following steps: depositing a transition layer, depositing an anti-corrosion film main layer, collecting a negative pulse rising edge displacement current slope in real time, determining a charge adsorption saturation point according to a first-order derivative zero crossing point of the slope, a nanosecond controlled overshoot stage is driven to induce transverse migration of atoms, the nanosecond controlled overshoot stage is switched to a platform stage to maintain deposition, and residual charges are eliminated in a neutralization stage. Instantaneous high-momentum ion flow generated by dynamic response of a sheath layer is used for improving the density of a film layer, and lattice dislocation migration is eliminated in cooperation with an energy release mechanism of a pulse gap; the physical contradiction of cracking caused by accumulation of residual compressive stress in a high-density film is solved, the film layer structure is in a low-stress equilibrium state, the interface anchoring strength is enhanced, and penetration of a corrosive medium is blocked.

The utility model discloses a transmission assembly, a power transmission device and a vehicle, the transmission assembly comprises a power shaft, a driven gear, a transmission part and a buffer part, a driving gear is arranged on the power shaft, the driving gear is suitable for being meshed with a power output device, a matching section is formed on the power shaft, and the driven gear is arranged on the matching section in a sleeving mode; the driven gear can rotate relative to the matching section, a first circumferential matching part is arranged on the driven gear, the transmission part is arranged on the matching section and rotates synchronously with the power shaft, a second circumferential matching part is arranged on the transmission part, and the second circumferential matching part and the first circumferential matching part are arranged correspondingly. When the driven gear moves in the circumferential direction relative to the matching section, the first circumferential matching part and the second circumferential matching part get close to each other or get away from each other, the buffering piece is connected between the first circumferential matching part and the second circumferential matching part, and the buffering capacity of the transmission assembly can be improved.

The utility model relates to waste collection technical field, the utility model provides a waste tank for converter, it includes inner lining, the inner side of inner lining is installed with support mechanism, the support mechanism is used for supporting integral structure, the inner bottom wall of inner lining is installed with vibration mechanism. In the utility model, the fixed frame is erected equidistantly and perpendicularly on the ground, the long plate no.

The present application relates to a secondary battery, an electronic device, and a power tool, which suppresses occurrence of poor insertion of a welding rod and the like. A secondary battery in which an electrode winding body, a positive electrode current collecting plate, and a negative electrode current collecting plate are housed in a battery can, in the electrode winding body, a strip-shaped positive electrode and a strip-shaped negative electrode are stacked with a separator interposed, the electrode winding body has a flat surface and a groove formed in the flat surface, the flat surface is formed by bending either one or both of a positive electrode active material non-covered portion and a negative electrode active material non-covered portion toward a center axis of a structure after winding and overlapping each other, in the case of observing in cross section with a cross section obtained by cutting with a plane passing through the center axis, a hole portion formed in a portion obtained by bending has a first diameter and a second diameter which are substantially parallel to a stacking direction, the first diameter is located at a position closer to an inside of the electrode winding body than the second diameter, and from the first diameter to the second diameter, the diameter substantially continuously increases.

The utility model discloses a display panel and a display device. The display panel comprises a substrate; the connecting areas and the buffer areas are alternately arranged on one side of the substrate; the connection area is provided with a chip pin connection terminal, the buffer area comprises at least two inorganic film layers and at least one organic film layer which are stacked, and the inorganic film layers and the organic film layers are alternately arranged. According to the technical scheme, the inorganic film layers and the organic film layers are alternately arranged in the buffer area in the stacked mode, the patterns are arranged on the surfaces of the inorganic film layers, in the pressure bearing process, the pressure resisting capacity is enhanced, stress is fully released, the film layers are prevented from cracking, and the risk that the film layers of the display panel fall off is avoided.

The utility model relates to the technical field of corrugated boards, in particular to a corrugated board with a honeycomb structure, which mainly solves the problems of low longitudinal compressive strength and poor buffering performance of a honeycomb paperboard in the prior art, and comprises a corrugated board body which comprises a surface layer, a middle layer and a bottom layer, the surface layer comprises a first surface layer, a second surface layer with a wave structure and a third surface layer with a wave structure, the second surface layer is provided with a second wave crest and a second wave trough, the third surface layer is provided with a third wave crest and a third wave trough, the lower surface of the second wave trough is compositely connected with the upper surface of the third wave trough, and the amplitude of the second wave crest is larger than that of the third wave crest; a plurality of grooves are concavely formed in the upper surface of the middle layer, the upper surface of the middle layer is in composite connection with the lower surface of the third surface layer, the third troughs are embedded in the grooves, and the upper surface of the bottom layer is in composite connection with the lower surface of the middle layer.

This invention discloses a tensile-strength steel-cored aluminum stranded wire, relating to the technical field of steel-cored aluminum stranded wire. The tensile-strength steel-cored aluminum stranded wire of this invention comprises at least: a steel core; a Zn-Ni-WC composite coating, electroplated on the steel core; aluminum strands, stranded on the steel core coated with the Zn-Ni-WC composite coating; and an anti-corrosion coating applied to the stranded aluminum strands. The anti-corrosion coating comprises the following raw materials in parts by weight: 60-70 parts of long-chain modified polyurethane acrylate prepolymer; 25-30 parts of acrylate isoborneol ester; 15-20 parts of dopamine-modified sustained-release microcapsules; 2-5 parts of photoinitiator; 0.5-1.5 parts of leveling agent; and 0.5-1.5 parts of dispersant. This invention, by setting a Zn-Ni-WC composite coating on the steel core and an anti-corrosion coating on the steel-cored aluminum strands, enables the prepared tensile-strength steel-cored aluminum stranded wire to possess superior corrosion resistance and ultra-long-term tensile strength retention.

The application provides a UV white ink and a preparation method thereof. The preparation raw materials of the UV white ink include, in parts by weight, 3-15 parts of silicone-modified acrylate prepolymer, 30-90 parts of monofunctional monomer, 1-10 parts of bifunctional monomer, 3-10 parts of photoinitiator, 1-15 parts of titanium white, 0.1-5 parts of dispersant and 0.1-5 parts of auxiliary agent. The silicone-modified acrylate prepolymer is used to improve the flexibility, smoothness and water resistance of the ink layer, and the specific functional monomer compound system is used to inhibit the curing shrinkage and enhance the adhesion, so that the UV white ink with excellent comprehensive performance is obtained, and is suitable for the inkjet printing of silica gel labels.

A coated steel sheet with low brightness from the moment of preparation and suppressed coating peeling is provided. The coated steel sheet of the present invention has a coating consisting of Al of 1.0 to 22.0% by mass, Mg of 1.5 to 10.0% by mass, and the remainder being Zn and any trace additives. The lightness L of the surface of the coated steel plate is less than 50, and the X-ray diffraction spectrum obtained by X-ray diffraction satisfies all of the following conditions (1) to (3): (1) A / B is more than 0.001 and less than 0.015; (2) A / C is more than 1.2; (3) The half-width d of the peak of A is more than 0.30 degrees and less than 1.00 degrees, where A is the peak intensity of the peak representing the 100 plane of ZnO that appears at 31.27 degrees or more and between 32.27 degrees, B is the peak intensity of the peak representing the 101 plane of Zn that appears at 42.73 degrees or more and between 43.73 degrees, and C is the intensity at 30.00 degrees of 2θ.

A sealing structure for a waterproof switch includes a switch body and a waterproof shell. The switch body has a base at its opening for fixing pins. The base is sealed to the inner wall of the switch body. The waterproof shell is snapped onto the base. A reinforcing layer is provided on the base. Each end face of the reinforcing layer along the pin distribution direction has a first snap-fit ​​plate. Each first snap-fit ​​plate includes a snap-fit ​​portion protruding from the reinforcing plate along the pin distribution direction. The waterproof shell has two first snaps corresponding to each snap-fit ​​portion on each side. A first snap-fit ​​groove is formed between the snap-fit ​​portion and the base for the first snaps to engage. The beneficial effect of this invention is that the symmetrical arrangement of the double first snaps and double snap-fit ​​groove structure significantly improves the bonding strength between the waterproof shell and the base.

Provided is a photosensitive resin printing plate precursor capable of inhibiting peeling of a photosensitive resin layer. The photosensitive resin printing plate precursor is a photosensitive resin printing plate precursor having at least a support and a photosensitive resin layer containing at least a polymer (A) having an ethylenic double bond, a compound (B) having an ethylenic double bond, and a photopolymerization initiator (C), the photosensitive resin layer having at least a first photosensitive resin layer containing a printing surface and a second photosensitive resin layer containing the inside of the photosensitive resin layer, the ethylenic double bond equivalent F1 (g / eq) of the (A) component in the first photosensitive resin layer being greater than the ethylenic double bond equivalent F2 (g / eq) of the (A) component in the second photosensitive resin layer.

The invention relates to the technical field of energy power, and discloses a phosphoric acid fuel cell PAFC separator graphite slurry spraying-drying-cooling-detection integrated continuous process, and the slurry is prepared from raw materials including crystalline flake graphite, fluorine modified phenolic resin, a polytetrafluoroethylene emulsion, a dispersant and a dilution solvent. The process comprises the following steps: carrying out double-sided coating by using a spraying station and matching with shielding protection; a near-infrared heater is adopted for drying; the exhaust hood and the dust collector are linked to generate micro negative pressure for cooling and dust collection; and carrying out quality detection by using an online weighing platform and a visual system. The core of the method is that a closed-loop self-adaptive compensation mechanism between detection data and spraying execution is established, and coating deviation is eliminated by adjusting slurry parameters in real time. And meanwhile, the hardened blocks are shielded through visual monitoring, online switching is triggered, and secondary pollution of the bonding surface is eliminated. The problems of poor process consistency and low efficiency in the prior art are solved, and the corrosion resistance and the production controlled degree of the partition plate are improved.

The application provides a WC-based hard alloy material for drilling super-deep wells, relates to the technical field of hard alloys, and is composed of a wear-resistant layer, a transition layer and a toughened supporting layer. The wear-resistant layer, the transition layer and the toughened supporting layer all include base alloy components and additive components. The base alloy components of the three layers all include WC powder, Ni powder, Co powder, Cr powder, Mo powder, NbC powder, Cr3C2 powder and VC powder. The WC powder particle size increases gradually between the wear-resistant layer, the transition layer and the toughened layer, and the Cr3C2 powder addition amount of the three layers is different. The material is designed by the partition organization of the wear-resistant layer, the transition layer and the toughened supporting layer, so that the WC-based hard alloy material is obtained. While the high corrosion resistance, erosion resistance and wear resistance are maintained, the local anti-cracking and anti-contact fatigue capacity of the sealing contact area is improved.

The invention discloses a method for preparing a high-entropy silicide composite coating on the surface of an Nb521 alloy through a single-step slurry melting method and application, and relates to the technical field of high-temperature alloy thermal protection. The method comprises the following steps: uniformly mixing refined Nb powder, Mo powder, Cr powder, Ta powder, W powder, Zr powder, Hf powder, Y powder, Ge powder and a cosolvent through ball milling to obtain slurry I; si powder, Cr powder, V powder, Fe powder and Ti powder are subjected to ball milling and mixed to be uniform, and slurry II is obtained; and a separation coating method is adopted, the slurry I and the slurry II are sequentially brushed or dip-coated on the surface of an Nb521 alloy matrix, heat treatment is conducted for 30-90 min at the temperature of 1450-1550 DEG C, and then the high-entropy silicide composite coating is obtained on the surface of the Nb521 alloy. The refractory high-entropy metal silicide composite protective coating with metallurgical bonding and high compactness is prepared by adopting a staged slurry permeation sintering method of a metal framework and a silicon source.