381 results about "Yttrium" patented technology

The invention discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

The invention relates to the technical field of rare earth metal electrolysis cathode protection coatings, in particular to a high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating on the surface of a tungsten cathode. A metallurgically bonded strong bonding bottom layer is constructed on a tungsten substrate through surface pretreatment and reactive sintering, then an atmosphere plasma technology is adopted to spray a creep-resistant gradient layer with continuous components to buffer thermal stress, and finally a sol-gel technology is utilized to construct an extremely compact corrosion-resistant surface layer in a superposition mode. The high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating is constructed through a multi-scale and multi-mechanism synergistic effect, the problems that a tungsten cathode coating is insufficient in binding force and poor in thermal shock resistance are fundamentally solved, molten salt permeation can be blocked, and the service life of a tungsten cathode in a severe environment is remarkably prolonged.

The invention discloses an yttrium-rich neodymium-iron-boron magnet and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet material preparation. The preparation method comprises the following steps: mixing yttrium-rich neodymium-iron-boron matrix alloy powder with grain boundary doped alloy powder containing Gd and / or Ho, and carrying out compression molding and sintering tempering treatment to obtain a first yttrium-rich neodymium-iron-boron magnet. According to the invention, the grain boundary doped alloy powder containing Gd and / or Ho is added into the yttrium-rich neodymium iron boron matrix alloy powder and then is sintered, so that a continuous and uniform non-magnetic thin-wall grain boundary phase structure is formed in the grain boundary, and the coercive force of the magnet is enhanced. Dy and / or Tb heavy rare earth element grain boundary diffusion is carried out based on the first yttrium-rich neodymium-iron-boron magnet after grain boundary modification, a second yttrium-rich neodymium-iron-boron magnet is obtained, the diffusion depth of Dy and / or Tb in the magnet can be increased, the utilization rate can be increased, the cost can be reduced, the coercivity of the magnet can be improved, and the adverse effect of Dy and / or Tb on residual magnetism can be reduced.

The method comprises the following steps: weighing an oxide precursor of metal indium, an oxide precursor of metal M, an ammonium salt and a lithium salt according to a chemical formula of indium-based halide, fully mixing, and calcining in an inert atmosphere to obtain the indium-based halide solid electrolyte. Forming an indium-based halide solid electrolyte through a solid-phase reaction; wherein M is selected from at least one of magnesium, calcium, strontium, barium, aluminum, gallium, indium, bismuth, scandium, yttrium, zinc, germanium, tin, lanthanum, cerium, samarium, gadolinium, holmium, erbium and ytterbium. The method can greatly simplify the synthesis process, reduce the raw material cost and realize industrial batch preparation.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention relates to the field of laser cladding powder, in particular to wear-resistant and corrosion-resistant laser cladding powder and a preparation method thereof. The laser cladding powder is used for solving the problem that a cladding layer formed by existing laser cladding powder is poor in abrasion resistance and corrosion resistance. According to the laser cladding powder, the carbon nano tube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder are added, and the carbon nano tube and the lanthanum-yttrium oxide have a synergistic effect to refine grains, so that the corrosion resistance of a cladding layer is improved, and the carbon nano tube has good wear resistance; after the surface of the titanium diboride powder is coated with the copolymer, the dispersity of the titanium diboride is improved, a product decomposed by the copolymer reacts with the titanium diboride under the action of laser to generate titanium carbide, and the wear resistance of a cladding layer is enhanced; the laser cladding powder is suitable for prolonging the service cycle of a mold, can be used for surface strengthening of mine equipment parts, enhances the wear resistance and corrosion resistance of the mine equipment parts, reduces the maintenance frequency of the equipment, and can provide an effective solution for surface strengthening of parts in various industrial fields.

The invention relates to the technical field of neodymium-iron-boron magnet production, in particular to a sintered neodymium-iron-boron magnet for preparing lanthanum-cerium-yttrium and a method of the sintered neodymium-iron-boron magnet. In the invention, the cerium element is used for replacing a praseodymium-neodymium alloy, meanwhile, the lanthanum and yttrium elements are introduced according to the proportion to generate a synergistic effect to regulate and control the structure of the high-cerium-content sintered neodymium-iron-boron magnet, the yttrium element is used for inhibiting main phase grain coarsening and improving the coercive force, and the lanthanum and yttrium elements can promote the flow of a rare earth-rich liquid phase in the sintering process and improve the diffusivity, so that the high-cerium-content sintered neodymium-iron-boron magnet is obtained. The density is improved.

The invention relates to a composite coating for a graphite mold and a preparation method of the composite coating. The composite coating comprises an yttrium-stabilized zirconia layer, a transition layer containing yttrium-stabilized zirconia and boron nitride and a boron nitride layer which are sequentially arranged from the inner surface of the graphite mold to the outside. The composite coating provided by the invention can reduce the cooling speed of a melt on a contact interface with the mold in the casting process, reduce the occurrence of cold shut, prolong the service life of the graphite mold and reduce the demolding resistance.

The invention discloses a method for in-situ leaching mining of sandstone uranium ore, the concentration of bicarbonate radical ions in ore bed water in the sandstone uranium ore is lower than 0.5 g / L, the sandstone uranium ore comprises yttrium-containing uranium ore, and the carbonate content is 1.5%-2.5%; the ore bed water serves as a solvent, 500 mL of leaching agents with different pH values adjusted through sulfuric acid are prepared, and the concentration of hydrogen peroxide in the leaching agents is 2 g / L; and determining the maximum pH value when the uranium ore in the slice sample is corroded by using the leaching agents with different pH values, and taking the maximum pH value as a critical pH value. The leaching agent with the critical pH value is used for exploiting the sandstone uranium ore, corrosion to gangue minerals in the leaching process can be reduced, the number of formed colloids and CaSO4 precipitates is reduced, the precipitates are prevented from blocking an ore bed, in addition, the method can be used for target corrosion of the refractory uranium ore, and therefore efficient leaching is achieved.

The invention discloses an yttrium-doped gradient structure environmental barrier coating and a preparation method and application thereof, the yttrium-doped gradient structure environmental barrier coating comprises a substrate, a Si-HfO2-Y bonding layer, a Yb < 2-x > Y < x > Si2O7 intermediate layer, a y > Yb < 1.6 > Y < 0.4 > DS-(1-y) Yb < 1.6 > Y < 0.4 > MS transition layer and a Yb < 2-z > Y < z > MS environmental barrier layer which are sequentially arranged, x is 0 to 1.2, y is 0.55 to 0.85, and z is 0.2 to 1.0. In the multi-layer structure of the yttrium-doped gradient structure environmental barrier coating, a continuous yttrium-doped gradient structure is formed, so that the thermal expansion coefficient of each layer in the continuous yttrium-doped gradient structure environmental barrier coating is increased in a gradient manner, the layers have good chemical compatibility, and the continuous yttrium-doped gradient structure environmental barrier coating can stably serve for a long time in the temperature range of room temperature to 1450 DEG C.

The invention provides a rare earth dispersion strengthened electrothermal alloy ribbon and a preparation method thereof. The rare earth dispersion strengthened electrothermal alloy ribbon comprises the following raw materials: chromium Cr, silicon Si, titanium Ti, aluminum Al, carbon C, yttrium Y, cerium Ce, Yb ytterbium, niobium Nb, vanadium V and iron Fe. The preparation method comprises the steps that the raw materials are subjected to smelting, forming, heat treatment and oxidation film treatment, a dispersed phase of rare earth oxides Y2O3, CeO2 and Yb2O3 and carbides NbC and VC is formed, an electrothermal alloy thin strip is subjected to triple dispersion strengthening, an Al2O3 + Cr2O3 + Nb2O5 + V2O5 + Yb2O3 composite oxidation film is formed on the surface of the thin strip, and finally the electrothermal alloy thin strip with thermal shock resistance and oxidation film stability is prepared.

The application discloses a composite pre-coating, a metal bipolar plate and a preparation method. The composite pre-coating comprises a soft metal layer, a first diffusion layer, a transition metal layer, a second diffusion layer, a ceramic transition layer, a third diffusion layer and a conductive carbon layer which are sequentially stacked; the material of the soft metal layer is any one of gold, silver, tin, magnesium, indium, copper, aluminum and yttrium. The composite pre-coating has small interface contact resistance and good conductivity, can effectively resist the strain force in the stamping process, has high bonding strength, prevents the peeling and cracking of the coating due to stamping, and effectively improves the compactness and corrosion resistance.

This application belongs to the field of target material production technology and discloses a method for preparing zirconium-yttrium alloy targets. First, zirconium is melted and cooled to obtain a zirconium ingot. Then, the zirconium ingot is flipped over and melted a second time. At the same time, metallic yttrium is added to the molten zirconium ingot to melt it to obtain a primary eutectic. Then, the primary eutectic is cooled to room temperature within 85 minutes to obtain a primary eutectic body. The primary eutectic body is then flipped over and melted a third time to obtain a secondary eutectic. Then, the primary eutectic is cooled to room temperature within 70 minutes to obtain a secondary eutectic body. Finally, the secondary eutectic body is machined, hot rolled, and hot isostatically pressed to obtain a zirconium-yttrium alloy target. This application improves the uniformity of zirconium and yttrium distribution by repeatedly flipping the zirconium ingot or eutectic body and remelting it. In addition, this application also discloses a zirconium-yttrium alloy target.

This invention discloses a method for repairing hot corrosion on the blade of a single-crystal gas turbine, comprising a process for removing the hot corrosion layer and a process for spraying a repair coating. In the process of removing the hot corrosion layer, high-pressure water jet is used to locally remove the hot corrosion layer on the blade. In the process of spraying the repair coating, a spray gun is used to spray the coating onto the area on the blade where the hot corrosion layer was removed. During the spraying process, the blade remains stationary while the spray gun moves horizontally. The use of high-pressure water jet technology to locally remove the hot corrosion layer on the surface of the working blade, and the optimized spraying parameters ensure that no damage is caused to the original coating and substrate, while reducing blade repair costs while ensuring thorough coating removal. By improving the spraying method and related parameters of supersonic flame spraying of nickel-cobalt-chromium-aluminum-yttrium-tantalum coatings, the coating thickness in each hot corrosion area can be effectively controlled within the range of 0.02-0.07 mm, while ensuring the antioxidant and corrosion resistance of the repair coating, meeting the blade design requirements, and ensuring that the blade returns to its pre-repair condition.

The invention discloses an H65 brass alloy doped with rare earth element yttrium and a preparation method and application thereof, and belongs to the technical field of alloy materials, and the H65 brass alloy doped with rare earth element yttrium comprises the following components in percentage by mass: 65% of copper element, 0.05-0.35% of rare earth element yttrium and the balance of zinc. Based on thermodynamic calculation, the range of the yttrium adding amount is obtained through phase change, and H65 brass and rare earth element yttrium are smelted in a vacuum induction smelting furnace. According to the H65 brass alloy doped with the rare earth element yttrium and the preparation method and application of the H65 brass alloy doped with the rare earth element yttrium, 0.5-0.35 wt% of the rare earth element yttrium is added into H65 brass in the smelting stage, impurities in the H65 brass are purified through the rare earth element yttrium, crystal grains are refined, the composition of the alpha / beta'phase is adjusted, the dezincification reaction is inhibited, and the quality of the H65 brass is improved. And the tensile strength, microhardness and corrosion resistance of the material are remarkably improved.

The invention discloses toughened honeycomb ceramic as well as a preparation method and application thereof. The toughened honeycomb ceramic is prepared by mixing, kneading, refining, drying and sintering a mixed ceramic raw material and an additive, the additive accounts for 4-12wt% of the weight of the mixed ceramic raw material, and the additive comprises yttrium-stabilized zirconia and nickel-titanium memory alloy in a mass ratio of (1-3): (1-3). According to the method, plastic deformation of the memory alloy is induced by utilizing the volume change of the instantaneous phase change of the yttrium-stabilized zirconia when the crack is generated, and the damage accumulated in the ceramic at the low-temperature stage can be partially recovered by utilizing the memory effect and the hyperelastic effect of the memory alloy. And a dual protection mechanism of instantaneous energy consumption and hysteresis recovery is constructed, and the damage resistance and toughness of the material are remarkably improved.

The application discloses a rare earth high-strength dual-phase steel and a forming method and application thereof, and belongs to the technical field of dual-phase steel. The forming method of the rare earth high-strength dual-phase steel comprises the following steps: converter smelting, LF refining, RH refining, adding cerium iron and yttrium iron at the end of the RH refining or before continuous casting, continuous casting, three-stage hot rolling, cold rolling and three-stage annealing. The rare earth high-strength dual-phase steel has good cold stamping formability, high weldability, no rare earth element segregation, no cracking of steel forming, high yield, and can be directly used to prepare automobile bodies after cold stamping forming at normal temperature. There is no rare earth inclusion or coarse carbon nitride brittle bulk agglomerate on the surface layer of the weld, the rare earth element is in a dispersed distribution state, has excellent dispersion strengthening effect, the weld is not prone to cracking, and the mechanical properties of the weld are superior to those of the base material.

A bond coat material providing unexpectedly high resistance to thermal cycle fatigue and sulfurization and unexpectedly extended thermal cycle life in the high temperature environment of a gas turbine engine component in the presence and absence of sulfur contains: a) 10 to 30 weight percent chromium, b) at least one of tantalum and molybdenum in a total amount of 3 to 15 weight percent, c) 5 to 13 weight percent aluminum, d) 0.1 to 1.4 weight percent silicon, e) 0.1 to 0.8 weight percent yttrium, f) 0 to 1.2 weight percent carbon, g) 0 to 1 weight percent dysprosium, h) 0 to 1 weight percent cerium, i) the balance being nickel, and the percentages of a) through i) adding up to 100 weight percent. The total amount of tantalum and molybdenum and the amounts of aluminum and silicon are each critical to avoid delamination of the top coat from the bond coat.

The application relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method thereof. The high-temperature-resistant flux-cored wire containing rare earth elements comprises a wire sheath and a core; the core comprises the following raw materials: dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, aluminiferous iron, potassium cryolite, potassium titanate, sodium titanate, iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, chromium-iron nitride, bismuth oxide, an additive, and the balance of reduced iron powder; the additive is a mixture of zirconium-iron alloy, ferrotitanium alloy and aluminum-magnesium alloy. The application introduces a specific alloy additive into the core to protect the transition of the rare earth yttrium, optimizes the welding performance of the yttrium and multiple components in cooperation, matches the 253MA heat-resistant steel, adjusts the components of the molten slag and the electric arc, and reasonably processes the technology, so that the welding quality of the wire is improved.

The invention relates to the field of architectural ceramics, and discloses light-transmitting powder, a gradually-changed light-transmitting ceramic tile and a preparation method of the gradually-changed light-transmitting ceramic tile. The light-transmitting powder comprises the following raw materials in parts by weight: 50-70 parts of nepheline syenite, 10-15 parts of superfine quartz, 10-20 parts of kaolin, 3-8 parts of barium carbonate, 5-10 parts of wollastonite, 3-5 parts of yttrium aluminum garnet and 2-4 parts of magnesium aluminate spinel. By adopting the formula, the light-transmitting green body which is high in light transmittance, stable in light transmittance and uniform in light transmittance can be prepared by compounding multiple components, and a good foundation is provided for preparing a ceramic tile with full-transparent jade texture.

This invention provides a multi-metal co-doped WC-Co coating and its preparation method, belonging to the field of metal-ceramic coating technology. The preparation method includes: weighing tungsten, yttrium, cerium, chromium, and vanadium sources, mixing and dissolving them in deionized water, adjusting the pH to 3-4, and obtaining a precursor through co-precipitation, washing, and drying; subjecting the precursor to sequential aerobic calcination, hydrogen reduction, and carbonization treatments to generate a WC phase, resulting in a rare-earth-transition multi-metal co-doped WC-based composite material; using the WC-based composite material, cobalt powder, and additives as raw materials, spraying the raw materials onto the substrate surface via thermal spraying to form a multi-metal co-doped WC-Co coating. The WC-Co coating prepared by this invention incorporates four elements—yttrium, cerium, chromium, and vanadium—forming a multiple synergistic mechanism of grain refinement, interface strengthening, and decarburization inhibition, effectively improving the hardness, wear resistance, corrosion resistance, and toughness of the WC-Co coating.

The invention discloses a preparation method of an iron-chromium-aluminum alloy containing an oxidation film. The preparation method comprises the following steps: S1, preparing the iron-chromium-aluminum alloy containing 4-8% of aluminum, 14-23% of chromium, 200-450 ppm of rare earth selected from lanthanum, cerium and yttrium, and less than or equal to 100 ppm of carbon; s2, the prepared iron-chromium-aluminum alloy is made into a base material with the thickness larger than 100 micrometers; and S3, the base material is subjected to heat treatment for 6-10 hours in an oxygen atmosphere vacuum environment at the temperature of 1200-1400 DEG C, then cooling is conducted, and the iron-chromium-aluminum alloy containing the oxidation film is prepared, and by means of the method, the thickness of the oxidation film can be increased.

To provide at least any of a zirconia sintered body of a solid solution of titanium and yttrium with fracture being difficult to propagate as compared to a zirconia sintered body of a solid solution of titanium and yttrium showing transparency and also showing transparency, a manufacturing method thereof, and use thereof.SOLUTION: A zirconia sintered body of a solid solution of titanium and yttrium has a content of yttrium of 3.5 mol% or over and under 6.0 mol%, a content of titanium of 6.0 mol% or over and 18.5 mol% or under, a straight transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm of 45% or over, a ratio of a straight transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm to a total light transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm of 0.70 or over, and a fracture toughness value (KIC) of 1.5 MPa m0.5 or over.SELECTED DRAWING: Figure 1

The present application relates to the technical field of diamond saw blade, in particular to a laser welded diamond saw blade for ultra-narrow slit cutting and a preparation method thereof.The laser welded diamond saw blade comprises the following raw materials: copper-cobalt-tin alloy powder, tungsten carbide powder, titanium aluminum nitride, spherical cobalt powder, rare earth yttrium powder, phosphorus iron powder and diamond abrasive particles.The core of the preparation method is the combination of powder metallurgy pre-preparation of the cutter head and precise laser welding process, especially the innovative laser welding process.The prepared diamond saw blade has high weld strength, narrow heat affected zone and minimal substrate deformation, solves the problems of substrate deformation, insufficient weld strength and short service life of traditional saw blades in ultra-narrow slit cutting, and is perfectly suitable for ultra-narrow slit cutting scenarios with extremely high requirements for precision and stability.

The invention discloses a preparation method of a rare earth doped Bi2MoO6 / In2O3 heterojunction composite photocatalyst, and belongs to the technical field of photocatalytic materials, and the preparation method specifically comprises the following steps: S1, preparing a precursor; step S2, preparation of a solid-liquid mixture: putting bismuth salt, rare earth metal salt, hexadecyl trimethyl ammonium bromide and sodium molybdate into deionized water, performing ultrasonic dispersion, adding the precursor In2O3, and performing ultrasonic stirring and uniform mixing to obtain the solid-liquid mixture; and S3, carrying out a hydrothermal reaction on the solid-liquid mixture, naturally cooling, centrifuging, carrying out solid-liquid separation, washing the solid with deionized water, and drying to obtain the rare earth doped Bi2MoO6 / In2O3 heterojunction composite photocatalyst. According to the invention, rare earth doping (especially yttrium Y doping) is introduced, so that the light absorption capacity of the material is further enhanced, efficient migration and compounding inhibition of photo-induced electrons and holes are realized, regulation and control of the energy band structure and light absorption performance of the material are realized, the utilization rate of visible light is further enhanced, and finally, the photocatalytic activity is remarkably improved.

The invention relates to the technical field of aluminum processing, in particular to a ceramic particle and rare earth composite reinforced micro-channel flat tube profile which comprises the following components in percentage by mass: less than 0.12% of iron, silicon (Fe and Si), 0.4-0.8% of manganese (Mn), 0.5-1% of yttrium (Y), 0.01-0.1% of ceramic particles, less than 0.02% of other single impurities, less than 0.1% of total impurity content and the balance of aluminum (Al). The mass ratio of iron to silicon is 2-3, manganese Mn and yttrium Y are aluminum-based intermediate alloys, the ceramic particles are TiC ceramic particles, and the size of the TiC ceramic particles is smaller than or equal to 20 microns. The components of the aluminum alloy are redesigned, the impurity content of Fe and Si is reduced by controlling raw materials, the content of Mn is optimized and adjusted, rare earth Y is added, a large amount of TiC ceramic particle reinforcements which are uniformly dispersed in grains and grain boundaries are obtained, and the precipitated phase of the alloy is fine and uniform.

The invention belongs to the field of petroleum mechanical sealing, and discloses a throttle pipe sealing structure and a preparation method thereof.The throttle pipe sealing structure comprises a throttle pipe body and a composite sealing ring arranged on a sealing section of the throttle pipe body in a sleeving mode, and the composite sealing ring is formed by compounding a metal base layer and a non-metal functional layer; the metal substrate layer comprises the following raw materials: 40-55 parts of nickel-based alloy powder, 10-16 parts of chromium powder, 7-13 parts of molybdenum powder, 4-9 parts of tungsten powder, 3-7 parts of tantalum powder, 2-5 parts of vanadium powder, 1-4 parts of niobium powder, 0.5-2 parts of rare earth yttrium powder, 2-4 parts of titanium powder, 1-3 parts of aluminum powder and 0.1-0.5 part of graphene nanosheets; the nonmetal functional layer is prepared from the following raw materials: 45 to 65 parts of polytetrafluoroethylene resin, 12 to 22 parts of graphite powder, 6 to 12 parts of carbon fiber, 5 to 12 parts of boron nitride nanosheet, 3 to 8 parts of polyether-ether-ketone micro powder, 2 to 5 parts of molybdenum sulfide and 4 to 8 parts of nano silicon dioxide coated mica powder; the material ratio of the composite sealing ring and the structure of the sealing groove are optimized, so that the sealing performance, the temperature-resistant and pressure-resistant performance and the flexibility are synergistically improved.

The application relates to the technical field of numerical control cutter materials, and particularly discloses a nano hard alloy numerical control cutter material and a preparation method thereof, which comprises the following raw materials in parts by weight: 45-50 parts of tungsten carbide powder with a particle size of 10 nm, 15-20 parts of cobalt powder, 5-7 parts of yttrium-modified nano boron nitride agent and 6-10 parts of ball milling adjusting agent. The nano hard alloy numerical control cutter material adopts the tungsten carbide powder, the cobalt powder, the yttrium-modified nano boron nitride agent and the ball milling adjusting agent, the yttrium-modified nano boron nitride agent and the ball milling adjusting agent are mutually coordinated, the cutter material obtained through mutual coordination and mutual assistance has excellent wear resistance, fracture toughness and stain resistance, the wear resistance, the fracture toughness and the stain resistance of the product are coordinately improved, and the high and low temperature stability of the product is remarkably improved.

The invention discloses an oil-stain-resistant and wear-resistant efficient protective rare earth coating and a preparation method thereof. The coating is composed of 50-70 parts of tungsten carbide powder, 10-20 parts of cobalt-coated tungsten carbide composite powder, 8-15 parts of yttrium-stabilized zirconia powder, 5-12 parts of rare earth oxide composite powder and 5-10 parts of nickel-chromium-aluminum-yttrium alloy bonding powder, wherein rare earth oxide is a mixture of cerium oxide and lanthanum oxide. The preparation method of the coating comprises the steps of base body sand blasting coarsening and cleaning, three-dimensional mixing of all component powder and high velocity oxy-fuel spraying deposition. Decarburization of tungsten carbide is inhibited through a cobalt coating structure, composite rare earth is utilized to refine grains and reduce surface energy, and an optimized spraying process is combined, so that the coating has high hardness, high bonding strength, low porosity, low wear rate and excellent oleophobicity, the problems that a traditional wear-resistant coating is easy to adhere, difficult to clean and short in service life in a greasy dirt environment are effectively solved, and the service life of the coating is prolonged. The coating is suitable for surface protection of key parts such as hydraulic machinery and aero-engines.

The invention provides a high-toughness silicon carbide ceramic composite material and a preparation method thereof, and belongs to the technical field of ceramic composite materials. According to the method, the eutectic liquid phase is formed in situ through the yttrium-lanthanum double rare earth boride, and necessary conditions are created for subsequent reaction; in the environment, the TiBX-C precursor and the graphene quantum dot and silicon nitride composite powder are subjected to a synergistic reaction, and a multi-scale reinforced structure with titanium carbide / beta-silicon nitride whiskers and the like as a framework and boron carbide particles dispersed in the framework can be formed in the material; in the aspect of interface regulation and control, a carbon layer converted by the graphene quantum dots forms a relatively weak interface around the whiskers, so that the effects of pulling out the whiskers and the like are played, and formation of a two-dimensional boron nitride sheet layer is promoted to introduce a crack deflection effect; when the crack expands, the energy of the crack can be synergistically dissipated by particle pinning, crack deflection, whisker bridging, pulling out and other processes, so that the high toughness of the material is realized, and the material is suitable for the field of green special refractory ceramics.