216 results about "Cobalt alloy" patented technology

The invention relates to the technical field of cables, and discloses an anti-torsional fatigue and corrosion-resistant wind power cable and a manufacturing process thereof, the anti-torsional fatigue and corrosion-resistant wind power cable comprises a three-phase cable core main body, a dynamic compensation anti-torsion layer, a multifunctional corrosion-resistant barrier layer and an outer sheath, the three-phase cable core main body comprises a stranded conductor, a filling inner layer and an insulating layer; the dynamic compensation anti-torsion layer comprises an incongruous spiral supporting layer and a shape memory alloy compensation layer, and the incongruous spiral supporting layer comprises aramid fiber bundles and a nickel-cobalt alloy wire woven mesh; the multifunctional anti-corrosion barrier layer is arranged on the outer side of the dynamic compensation anti-torsion layer and sequentially comprises an anti-corrosion barrier bottom layer, an anti-corrosion barrier middle layer and an anti-corrosion barrier bottom layer surface layer from inside to outside. Through the gradient composite structure design, the problem of failure of a traditional wind power cable under long-term dynamic load and severe environment is effectively solved, and the torsional fatigue resistance, the corrosion resistance and the environmental adaptability are remarkably improved.

A firearm suppressor is provided, including a tubular core, a baffle carried within the core, and a tubular mount. The core may be attached end-to-end to the mount. A cap may be attached end-to-end to the core opposite the mount. An intermediate member may be included, extending between the mount and the cap, and residing outboard of the core. The intermediate member may be welded to the mount and to the cap. The mount, the cap, and the intermediate member may be composed of one or more of titanium, aluminum, resins, polymers, composites, carbon fiber, and ceramics, whereas the core and the baffle may be composed of one or more of cobalt, nickel alloy, steel, stainless steel, and cobalt alloy.

This invention relates to a method for synthesizing iron-cobalt alloy-doped carbon nanofibers for electrocatalysis using zinc oxide etching, belonging to the technical field of electrode materials and catalysts. The preparation method includes the following steps: 1) mixing DMF (dimethylformamide), PMDA (pyromellitic dianhydride), and ODA (4,4-diaminodiphenyl ether) in a certain proportion to prepare a PAA (polyamic acid) spinning solution; 2) preparing PAA nanofibers from the PAA spinning solution using an electrostatic melt-blowing device; 3) imidizing the PAA nanofibers using a programmed temperature rise method to obtain PI nanofibers; 4) impregnating the PI nanofibers in a salt solution; 5) carbonizing the impregnated PI nanofibers with a large number of metal ions on their surface in an inert atmosphere using a certain temperature rise program to obtain iron-cobalt alloy-doped carbon nanofibers. The iron-cobalt alloy-doped carbon nanofibers prepared by this method exhibit excellent performance as an ORR / OER bifunctional electrocatalyst and have wide applications.

The invention provides a ruthenium-cobalt target material for forming a component gradient thin film, which comprises a target material unit and a back plate, the target material unit has different ruthenium-cobalt proportions, and the target material unit is prepared by uniformly mixing ruthenium powder and cobalt powder according to different atomic ratios, carrying out die forming and then carrying out hot isostatic pressing sintering, the target material units with two different component proportions are sequentially and alternately spliced and fixed on the back plate to form the ruthenium-cobalt target material. The ruthenium-cobalt target material is composed of two ruthenium-cobalt alloy target materials with different ruthenium-cobalt proportions, the ruthenium-cobalt target materials are fixed to the same back plate, and the gradient film with the ruthenium-cobalt components continuously changing in the film thickness direction can be formed by adjusting sputtering parameters under the condition that the target material is not replaced.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

The present invention provides a hydrogenation catalyst for petroleum resin, the hydrogenation catalyst comprises a catalyst, the catalyst contains an active component main body expressed as a general formula of M1-M2 / SiO2-Al2O3, M1 is an alloy of Ni and Co, and the atomic ratio of Ni to Co is 2: 1-4: 1; m2 is a composite oxide of Mo and W, and the molar ratio of Mo to W is 1: 1-3: 1; and SiO2-Al2O3 is used as an aluminum silicate precursor and is subjected to hydrolytic condensation to form a composite carrier with a three-dimensional silicon-aluminum bond network structure. The invention relates to the technical field of petroleum resin catalysts. The surface of the carrier is anchored with double active components, namely nickel-cobalt alloy capable of efficiently cracking hydrogen and generating active hydrogen atoms and molybdenum-tungsten composite oxide capable of selectively adsorbing aromatic rings and sulfide molecules; and cracked hydrogen atoms can be quickly migrated to adsorption sites through the surface of the carrier, and aromatic ring hydrogenation saturation and deep removal of sulfur impurities can be synchronously realized, so that the working efficiency of the hydrogenation catalyst is effectively improved.

The invention discloses a preparation method of a micro-comb-tooth structure diamond grinding wheel with abrasive particle positive relief angles and the obtained diamond grinding wheel, and the preparation method comprises the following steps: step 1, preparing grooves which are arranged in order to form a certain array on the circumferential surface of a grinding wheel base body through precision milling, and directionally bonding diamond abrasive particles in the grooves by using conductive adhesive; nickel-cobalt alloy is deposited through a pulse electroplating method to achieve mechanical solidification of the abrasive particles; 2, the grinding wheel obtained in the step 1 is shaped through a pulse laser system, and effective control over the outer circumference run-out of the grinding wheel is achieved; 3, the abrasive particle positive relief angle, obtained in the step 2, of the grinding wheel is subjected to forming machining; and 4, micro comb tooth structure machining is conducted on the grinding wheel in the step 3.

The invention discloses a copper-cobalt alloy / lanthanum hydroxide heterojunction catalyst and a preparation method and application thereof.The preparation method includes the steps that lanthanum-based perovskite oxide LaCu (1-x) CoxO3 is prepared through a sol-gel method, and x is equal to 0.1-0.5; laCu1-xCoxO3 is placed in hydrogen and argon mixed gas for reduction treatment, and the copper-cobalt alloy / lanthanum hydroxide heterojunction catalyst is obtained and used for preparing ammonia through electro-catalysis nitrate radical reduction. According to the preparation method, an in-situ dissolution strategy is adopted, a copper-cobalt alloy / lanthanum hydroxide strong interface coupled heterostructure is constructed, CuCo alloy nanoparticles provide high conductivity and rich active sites and form a heterostructure with La (OH) 3, the d-band center of the active sites is optimized through interaction of strong electrons, NO3 <-> adsorption and reaction intermediate stability are promoted, and the stability of the reaction intermediate is improved. The excellent electro-catalytic performance is realized.

The invention discloses a metal organic framework derived carbon coated iron-cobalt alloy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an iron-based metal organic framework, phenanthroline, cobalt salt and an organic solvent into a precursor mixed solution, and performing solvothermal reaction and pyrolysis to obtain the iron-cobalt alloy catalyst. According to the preparation method disclosed by the invention, cheap and easily available raw materials are adopted, and the green and environment-friendly metal organic framework derived carbon coated iron-cobalt alloy catalyst which is large in specific surface area, rich in active sites, stable in structure and excellent in catalytic performance can be prepared through a mild solvent volatilization-calcination two-step method; the method can be used for advanced treatment of organic pollutant wastewater, can realize efficient removal of organic pollutants, and is high in use value and good in application prospect. According to the preparation method disclosed by the invention, the iron-based metal organic framework is directly used as an iron source, so that additional addition of iron salt is avoided, the risk of iron precipitation and impurity introduction is fundamentally eliminated, and pH regulation is not needed.

The application provides a preparation method of a platinum-cobalt alloy catalyst, which comprises the following steps: preparing a hexadecyl trimethyl ammonium bromide clear solution; preparing a platinum compound, a transition metal cobalt salt and a dimethyl imidazole dispersion solution; adding the dispersion solution into the hexadecyl trimethyl ammonium bromide clear solution in sequence, stirring, adding a carbon black, a ketchen black, a cabot black or a carbon nanotube slurry, and continuously stirring to obtain a mixed solution I; then centrifuging, vacuum drying and grinding the mixed solution I to obtain an intermediate powder; then performing a different temperature staged calcination on the intermediate powder under a reducing / inert atmosphere to obtain an ordered low platinum-cobalt alloy catalyst powder; and then performing an acid washing, suction filtration, vacuum drying and grinding on the ordered low platinum-cobalt alloy catalyst powder to obtain a catalyst product which can be used in a fuel cell. The platinum-cobalt alloy catalyst prepared by the application can be applied to a proton exchange membrane fuel cell as a cathode oxygen reduction catalyst, and the platinum-cobalt alloy catalyst can improve the utilization rate, catalytic activity and durability of the noble metal Pt in the fuel cell cathode ORR catalyst, and can reduce the manufacturing cost and use cost of the fuel cell.

The application provides a preparation method of a nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The method comprises the following steps: (1) stirring and mixing a nitrogen-doped carbon carrier with an alcohol solvent to obtain a uniformly dispersed system A; (2) uniformly mixing a metal precursor with an alcohol solution by ultrasonic mixing to obtain a uniformly dispersed system B; (3) uniformly stirring and mixing the system A and the system B, then performing oil bath heating, and then performing washing and drying to obtain a nitrogen-doped carbon-supported platinum-cobalt alloy; and (4) placing the product obtained in step (3) into a porcelain boat, annealing the product in an inert atmosphere at a high temperature, and cooling the product to room temperature to obtain the nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst. The nitrogen-doped carbon-supported platinum-cobalt intermetallic compound catalyst prepared by the method has a uniform particle distribution and exhibits good catalytic activity and stability in an oxygen reduction reaction (ORR) of a fuel cell.

The invention provides a double-phase high-cobalt alloy strip and a preparation method thereof, and belongs to the field of metal materials. The double-phase high-cobalt alloy strip is composed of the following chemical components of 1.5%-4.0% of Fe, smaller than or equal to 0.2% of C, smaller than or equal to 0.002% of T.O, smaller than or equal to 0.001% of N, 0-1% of Mn, 0.5%-5% of Si, Cr, Mo and a matrix element Co. Wherein Cr and Mo meet the following relational expressions: 20% < = [Cr] + [Mo] < = 25% and 0 < = [Mo] / [Cr] < = 4, in the expressions, [Cr] represents the mass fraction of Cr, and [Mo] represents the mass fraction of Mo. According to the preparation method, a double-phase structure, the inclusion content and a strengthening phase are precisely regulated and controlled through element matching, the room-temperature plasticity and the cold machining capacity are remarkably improved while the high-temperature mechanical properties (such as strength and creep resistance) of the alloy are guaranteed, and synchronous optimization of the machining property and the mechanical property is achieved.

The invention relates to a samarium cobalt permanent magnet and a preparation method thereof. The preparation method comprises the following steps: providing a samarium-cobalt alloy; the samarium-cobalt alloy is subjected to oxidation heat treatment, the oxidation heat treatment process meets the following relational expression: t = kP / T, t is the heat preservation time, and the unit is h; t is the heating temperature, and the unit is DEG C; p is the vacuum degree, and the unit is Pa; k is a coefficient, and k is equal to 100 to 5000; crushing and pulverizing the samarium-cobalt alloy subjected to oxidation heat treatment to obtain alloy powder; and carrying out orientation molding on the alloy powder to obtain a samarium-cobalt green body, and carrying out sintering treatment to obtain the samarium-cobalt permanent magnet. According to the preparation method, the bending strength can be greatly improved while the high-hardness magnetic performance of the samarium-cobalt permanent magnet is guaranteed, the preparation process is simple and efficient, and the preparation method is suitable for industrial production.

The invention relates to an iron-cobalt-based magnetically soft alloy, in particular to a near-zero magnetostrictive iron-cobalt-based magnetically soft alloy and a preparation method thereof. The alloy comprises the following chemical components in percentage by mole: 2% of V or Ni or Si, 19%-26% of Fe and the balance of Co. The preparation method comprises the following steps: S1, preparing furnace charge; s2, heating and smelting to obtain molten steel conforming to chemical components; s3, cooling to obtain an alloy ingot; s4, the alloy ingot is subjected to solid solution for 1-6 h at the temperature of 1100-1200 DEG C; s5, annealing; and S6, segmented cooling is conducted, and the near-zero magnetostrictive iron-cobalt-based magnetically soft alloy is obtained. The transition element vanadium or nickel or silicon is doped in the cobalt-rich iron-cobalt alloy, so that a crystal structure composed of iron atoms and cobalt atoms in the iron-cobalt alloy is converted into a face-centered cube from a body-centered cube; meanwhile, vanadium or nickel or silicon can influence the movement of a magnetic domain in the iron-cobalt alloy, so that the magnetomechanical behavior of the iron-cobalt alloy is improved, and near-zero magnetostriction is realized.

The invention relates to the technical field of microwave absorption, and discloses a preparation method and application of an iron-cobalt alloy carbon inlaid composite material, the preparation method of the composite material comprises the following steps: S1, taking spinel type iron-cobalt alloy powder as a raw material, adding phenolic resin and a solvent for mixing, and then removing the solvent to obtain an iron-cobalt alloy / phenolic resin homogeneous mixture; s2, heating and curing the iron-cobalt alloy / phenolic resin homogeneous mixture, and then crushing and sieving the iron-cobalt alloy / phenolic resin homogeneous mixture to obtain iron-cobalt alloy inlaid phenolic resin particles; and S3, the material obtained in the S2 is subjected to high-temperature carbonization under the vacuum condition, and the iron-cobalt alloy carbon inlaid composite material is obtained. The FeCo-C / RGO / PLA wave-absorbing wire is prepared by further combining a fused deposition modeling technology, taking the particles as a wave-absorbing phase and compounding the particles with reduced graphene oxide (RGO) and polylactic acid (PLA). The obtained material has the characteristic of broadband absorption, and an innovative solution is provided for electromagnetic pollution treatment in the fields of 5G communication, military stealth and the like.

The present invention relates to an alkaline composition for cleaning a substrate comprising i) copper or a copper alloy and ii) cobalt or a cobalt alloy, the composition comprising: a) at least one pH adjuster selected from compounds of formula I 【Chemical 1】 TIFF2026524618000015.tif3368(where Ra, Rb, Rd and Rf are each independently selected from unsubstituted linear or branched C1-C 12 alkyl, Re is selected from unsubstituted linear or branched C4-C9 alkyl; provided that the dashed bond between Re and N is a single bond or a double bond, and when the dashed bond is a double bond, Rd does not exist, Ra, Rb, Re and Rf are joined to form one or more 6-membered or 7-membered rings), b) at least one complexing agent selected from C2-C 12 hydrocarbons having at least two sulfonic acid groups or carboxylic acid groups, c) at least one polymeric dispersant having a mass average molecular weight of 1000 g / mol or more; and d) a solvent containing water and comprising.

The invention discloses a samarium-cobalt magnet and a preparation method thereof. The samarium-cobalt magnet takes low-melting-point alloy powder, samarium oxide powder and samarium-cobalt magnetic powder as raw materials; the component of the samarium cobalt magnetic powder is Sm (Co < 1-a-b-c > Fe Cu Zr < c >) < z >; the component of the low-melting-point alloy is RE1-xMx, RE is one or more of Pr, Nd and Sm, and M is one or more of Cu, Al and Ga. The preparation method comprises the following steps: smelting a samarium-cobalt alloy raw material and a low-melting-point alloy raw material, and sequentially performing coarse crushing, medium crushing and jet milling to obtain samarium-cobalt magnetic powder and low-melting-point alloy powder; mixing samarium oxide powder, low-melting-point alloy powder and samarium cobalt magnetic powder to obtain magnetic powder; sequentially performing magnetic field forming, cold isostatic pressing and low-temperature sintering to obtain a sintered blank; and the sintered blank is sequentially subjected to solution treatment and aging heat treatment. The bending strength and the fracture toughness of the samarium-cobalt magnet are greatly improved, and the samarium-cobalt magnet has high magnetic performance and good mechanical performance.

The presently claimed invention relates to an alkaline composition for cleaning a substrate comprising i) copper or copper alloy and ii) cobalt or cobalt alloy, the composition comprising: a) at least one pH adjustor selected from diglycolamine, 4,4-diethoxy-N,N-dimethyl-1-butanamine, 3-dimethylaminopropan-1-ol, dimethylaminoethoxyethanol, N,N-dimethylisopropanolamine, ethylethanolamine, N-methyldiethanolamine, 2-(2-(methylamino)ethoxy)ethanol, 3-(methylamino)propane-1,2-diol, 2-[2-[2-(2-methoxy- ethoxy)ethoxy]ethoxy]ethylamine, 2-[2-(2-aminoethoxy)-ethoxy]-ethanol, N-butyldiethanolamine, diisopropanolamine, N-methyldiisopropanolamine, monoethanolamine, 3-dimethylamino-1,2-propandiol, 2- amino-1-butanol, 2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethanol, prolinol, 1-methyl-2-pyrrolidinemethanol, 1-methyl-2-pyrrolidinemethanol, 1-methyl-3-pyrrolidinol, 2-amino-2-methyl-1-propanol, N,N-dimethylethanolamine, butylethanolamine, diethylethanolamine, 3-methoxypropylamine, 4-(2-hydroxyethyl)morpholine, 4-(dimethylamino)cyclohexanol, 2-amino-2-methyl-1, 3-propanediol, or diisopropylamine; b) at least one complexing agent selected from C2 to C12 hydrocarbon having at least two sulfonic acid or carboxylic acid groups; c) at least one polymeric dispersing agent having a weight average molecular weight ≥ 1000 g / mol; and d) a solvent comprising water.

The invention belongs to the technical field of fuel cell cathode oxygen reduction catalysts, and particularly relates to a high-dispersion platinum group metal-transition metal mesoporous carbon catalyst and a preparation method and application thereof. The high-dispersion platinum-cobalt alloy mesoporous carbon catalyst is prepared in an ammonia water dipping coprecipitation-confinement reduction mode, the problems that in a traditional platinum-cobalt mesoporous carbon catalyst, the utilization rate of precious metal is low, and stability is poor are solved, efficient catalysis of a fuel cell ORR is achieved, and the application prospect is wide. The prepared high-dispersion platinum-cobalt mesoporous carbon catalyst has an ECSA attenuation rate of less than 10% in a disc electrode three-electrode test after long circulation for 60k circles, and has a potential of 0.678 V and 1.356 W / cm < 2 > in a proton exchange membrane fuel cell (PEMFC) test when the current density is 2000mA / cm < 2 >.

The invention discloses a method for preparing an iron-chromium-cobalt alloy by using cobalt slag and ferrochrome slag, and belongs to the technical field of metallurgy and comprehensive utilization of resources. According to the method, zinc hydrometallurgy byproduct cobalt slag and ferrochrome alloy smelting byproduct ferrochrome slag serve as main raw materials, aluminum blocks and lime are matched, after drying, crushing, fine grinding and mixing are conducted, an aluminothermy self-propagating reduction reaction is triggered through electric auxiliary heating, high-temperature smelting is conducted at the temperature larger than or equal to 1500 DEG C, and finally the ferrochrome cobalt alloy is obtained through slag-metal separation and casting forming. According to the method, high-valued utilization of the dangerous waste residues is achieved, the process is simple, cost is low, energy consumption is low, the obtained alloy is low in carbon content and excellent in magnetic performance (residual magnetism is not smaller than 1.365 T, coercive force is not smaller than 48.63 kA / m, and magnetic energy product is not smaller than 48.26 kJ / m < 3 >), and the method is suitable for the field of permanent magnet materials and related high-end manufacturing.

The invention relates to a powder for manufacturing a part by selective laser melting, the powder being prepared by atomisation of an initial cobalt alloy, the cobalt alloy including 22% to 45% by weight of cobalt, 20% to 35% by weight of nickel, and 18% to 32% by weight of iron, the powder having the following particle size distribution: D10 size of less than 25 μm, D50 size of 20 μm to 50 μm, and D90 size of less than 80 μm. Figure for the abstract:

The invention relates to the technical field of gravity samplers, in particular to a petal structure of a gravity sampler, which comprises a pipe body, the outer side of the top end of the pipe body is sleeved with two support bearings, the outer side of the pipe body is fixedly sleeved with a first fixing hoop, and the outer side of the first fixing hoop is fixedly provided with a wireless remote control device. An electric control hydraulic telescopic rod is fixedly installed at the bottom of the wireless remote control device, and a second sealing piston is fixedly installed at the output end of the electric control hydraulic telescopic rod. According to the scheme, by arranging the first tungsten-cobalt alloy teeth and the second tungsten-cobalt alloy teeth, the petal shovel plate of the structure has a rotary drilling effect, the first tungsten-cobalt alloy teeth and the second tungsten-cobalt alloy teeth which are linearly distributed can enable the petal shovel plate to drill a sampling medium, and the petal shovel plate can be suitable for sampling operation of a soft medium; the anastomotic structure can reduce leakage when the structure is closed and increase the tooth drilling effect when the structure is opened, so that the sampling efficiency is indirectly improved.

The invention is applicable to the technical field of biomass energy catalysis and conversion, and provides a high-activity and high-stability nickel-cobalt alloy catalyst and a synthesis method and application thereof, and the synthesis method comprises the following steps: preparing S-1 zeolite; the preparation method comprises the following steps: mixing S-1 zeolite with an aqueous solution of Ni (NO3) 2.6 H2O and an aqueous solution of Co (NO3) 2.6 H2O for dipping, placing the mixture in a tetrapropylammonium hydroxide solution for hydro-thermal treatment, and performing static calcination to obtain a NixCoyO at S-1 nanocrystal; mixing the NixCoyO (at) S-1 nanocrystal with polymers P123, F127, dopamine hydrochloride and 1, 3, 5-trimethylbenzene, performing ultrasonic dispersion in a mixed solvent of water and ethanol, adding ammonia water for reaction, and collecting NixCoyO (at) S-1 (at) mPDA; and carrying out carbonization and reduction on the NixCoyO (at) S-1 (at) mPDA to obtain the NixCoy (at) S-1 (at) mC catalyst. The prepared catalyst has excellent hydrodeoxygenation performance, vanillin can be efficiently converted into 2-methoxy-4-methylphenol (MMP) under mild conditions, and the yield exceeds 94%.

Disclosed example pressure sensors include: a first body defining a reference pressure cavity; a second body defining a measured pressure cavity and having an inlet configured to receive a fluid; a diaphragm between the reference pressure cavity and the measured pressure cavity, the diaphragm comprising Havar® alloy and having a thickness of 0.010 inches or less; an electrode separated from the diaphragm by a gap to form a capacitance between the electrode and the diaphragm; and measurement circuitry configured to determine a pressure in the measured pressure cavity based on the capacitance.

A method of metallizing a semiconductor for the manufacture of three-dimensional semiconductor devices such as integrated circuits or storage memories. The metallization process includes a step of activating the surface, of a mineral oxide substrate with a noble metal, such as palladium, followed by a step of depositing a nickel or cobalt alloy containing boron and at least one of phosphorus and tungsten by electroless deposition.

A kind of porosity controllable additive manufacturing method of nickel-manganese-tin-cobalt alloy and application of the obtained product.The present application belongs to the field of solid refrigeration.The present application aims at the intrinsic brittleness of nickel-manganese-tin-based alloy,which is difficult to be processed into complex-shaped parts by traditional casting and numerical control processing,limiting its application.Meanwhile,aiming at the problem that the existing additive manufacturing method is easy to produce residual stress and element segregation,which affects the structural integrity and magnetic heat performance of the alloy.The present application uses water-based binder to carry out layer-by-layer spray forming of alloy powder,then adds deoxidizer and manganese powder,and carries out high-temperature sintering under vacuum condition to obtain nickel-manganese-tin-cobalt alloy with controllable porosity.The method of the present application effectively avoids the oxidation of the sample,so that the sample maintains good magnetic-structural characteristics,and obtains nickel-manganese-tin-based alloy with specific porosity,phase transition temperature interval near room temperature,and magnetic heat performance comparable to that prepared by traditional method,which shows broad application prospects in the field of magnetic refrigeration and other fields.

The invention discloses a medium and low temperature wave-absorbing porous ceramic raw material and a preparation method thereof. The medium-low temperature wave-absorbing porous ceramic is prepared from the following raw materials in percentage by weight: 20 to 50 percent of magnetic loss phase, 20 to 45 percent of dielectric loss phase, 24.6 to 55.2 percent of low-temperature non-toxic flux, 5 to 10 percent of dual-mode pore forming agent, 0.07 to 0.125 percent of zinc oxide powder turbid liquid and 100 to 400 percent of citric acid solution, wherein the dielectric loss phase is zinc oxide powder modified carbon fiber and modified silicon carbide; the magnetic loss phase is flaky carbonyl iron powder or flaky iron-cobalt alloy; the low-temperature non-toxic flux comprises borax, silicon dioxide, zinc oxide and phosphorus pentoxide; the dual-mode pore-forming agent is formed by adding limestone powder or calcium sulfate powder into a mixture of rice husks and starch. The preparation method has the advantages of low raw material modification cost, simple process, environmental protection and the like, can be used for preparing the porous ceramic raw material with good wave-absorbing performance and temperature resistance, and can meet the requirements of military and civil fields on high-performance wave-absorbing materials.

A method for preparing a large-sized copper-iron alloy ingot is provided, which adopts continuous or semi-continuous casting, and adopts the following treatments during the casting process: (1) component alloying: adding an alloying modifier to the copper-iron alloy melt, the alloying modifier is composed of a mixture of copper-calcium alloy, copper-aluminum alloy, copper-manganese alloy and copper-cobalt alloy, and the composition weight percentage of the alloyed ingot obtained after adding the alloying modifier is as follows: 0.002~0.01wt.% calcium, 0.02~0.12wt.% aluminum, 0.05~1.0 wt.% manganese, 0.01-0.2wt.% cobalt, 15-80wt.% iron, and the balance copper; (2) adding a nucleating agent: continuously adding a rare earth nucleating agent to the molten pool during the casting process, wherein the rare earth nucleating agent is composed of a mixture of a copper-cerium alloy and a copper-scandium alloy, and the mass percentage of the rare earth nucleating agent is: 6-13wt.% cerium, 10-35wt.% scandium, and the balance copper; (3) strong magnetic field suppression: applying a strong magnetic field around the crystallizer, including a constant magnetic field and a pulsed magnetic field. The present invention can effectively improve the uniformity of the distribution of iron elements and iron-rich phases in large-sized ingots through the above-mentioned treatment measures.

The utility model relates to a wear-resistant bimetallic plate structure which comprises a tungsten-cobalt alloy wear-resistant plate and a steel substrate, and a brazing layer or a high-temperature-resistant epoxy structural adhesive layer is arranged between the tungsten-cobalt alloy wear-resistant plate and the steel substrate. A plurality of bolts are pre-buried in the tungsten-cobalt alloy wear-resisting plate, and one end of each bolt extends to the steel base plate and is pre-tightened through a nut; the embedded depth of the bolt is 1 / 3-1 / 2 of the wall thickness of the tungsten-cobalt alloy wear-resisting plate and is not less than 3 times of the diameter of the bolt; the surface of the bolt is coated with a high-temperature-resistant coating, and the thickness of the high-temperature-resistant coating ranges from 0.1 mm to 0.3 mm. According to the utility model, through the bolt and brazing / cementing composite structure design, the problem that the traditional tungsten-cobalt alloy bimetallic plate is easy to peel off and lose efficacy due to insufficient interface bonding force is solved, the connection strength, reliability and applicability are obviously improved, and the bimetallic plate can stably operate under various complex working conditions.