260 results about "Cobalt alloy" patented technology

The present invention relates to the technical field of electroacoustic transduction. Disclosed in the present invention are a sound production unit and an electronic device. The sound production unit comprises a housing and a magnetic circuit system, which is arranged in the housing and comprises a magnetically conductive yoke, a central magnetic portion and a side magnetic portion, wherein the central magnetic portion and the side magnetic portion are arranged on the magnetically conductive yoke, and the side magnetic portion is arranged on an outer side of the central magnetic portion; the central magnetic portion comprises central magnetic steel and a central magnetically conductive plate, with two opposite sides of the central magnetic steel being respectively connected to the central magnetically conductive plate and the magnetically conductive yoke; the side magnetic portion comprises side magnetic steel and a side magnetically conductive plate, with two opposite sides of the side magnetic steel being respectively connected to the side magnetically conductive plate and the magnetically conductive yoke; the central magnetically conductive plate and / or the side magnetically conductive plate are / is made of a cobalt alloy material; and the magnetically conductive yoke is also made of a cobalt alloy material. A thinned design of the sound production unit of the present invention is realized, and the magnetic induction intensity of the magnetic circuit system is also effectively improved, thereby increasing the BL value, and thus the acoustic performance requirement of the sound production unit can be met.

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.

The present invention discloses a composite electroplating nickel-cobalt cathode hydrogen evolution catalyst and a preparation method thereof, wherein a double-sided sandblasted nickel mesh degreased with alkali solution is pickled and washed with water, then immersed in electrolytes of different concentrations, electroplated for a period of time under a three-electrode system, and after the electroplating is completed, it is washed three times with deionized water and calcined at high temperature to obtain a hydrogen evolution electrode catalyst with multiple active sites. Through the above manner, the present invention discloses a composite electroplating nickel-cobalt cathode hydrogen evolution catalyst and a preparation method thereof, and adopts a composite electroplating nickel-cobalt alloy method to prepare an electrocatalyst material with multiple active sites, which can not only effectively reduce production costs, but also can utilize the nickel-cobalt electrolyte to play a pore-forming role to increase the specific surface area of ​​the catalyst material, thereby increasing the active point of the catalyst and improving the catalytic activity of the catalyst.

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.

The invention relates to a carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction, a catalyst, a preparation method and application thereof, and the scheme is innovated by the following steps: dipping conductive carbon black (such as ketjen black ECP600JD) and 60-70wt% phosphoric acid solution according to a solid-to-liquid ratio of 1g / (15-18) mL, preheating at 100-250 DEG C in an argon atmosphere, then carrying out a reaction for 10-100 seconds under the assistance of a microwave power of 100-600 W, and carrying out vacuum drying to obtain the carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction. The phosphorus content of the prepared carbon carrier material is 4-6wt%, and the graphitization degree of the carbon carrier material is improved (ID / IG value is 1.15-1.20). And after the platinum-cobalt alloy is further loaded, the particle size of the nanoparticles is uniform, the potential loss is only 3 mV after 5000 accelerated attenuation tests in the proton exchange membrane fuel cell, and the power density attenuation is reduced by 58%. The method has the advantages of quick reaction, low energy consumption, high corrosion resistance and the like, and the stability of the catalyst is remarkably improved.

The invention relates to the technical field of steel material surface protection, in particular to a method for plating nickel and cobalt on steel by combining direct current and pulse electrodeposition. Comprising the following steps: removing oil from a steel strip by adopting an electrochemical method to obtain an oil-removed steel strip; the oil-removed steel strip is activated, an oxide film on the surface of the base material steel strip is removed, and the pretreated steel strip is obtained; pre-plating a nickel plating layer on the pretreated steel strip by adopting direct-current electrodeposition; and plating a nickel-cobalt alloy layer on the nickel plating layer by adopting pulse electrodeposition. The nickel-plated cobalt steel strip prepared through the method has high corrosion resistance and punch forming capacity, the production efficiency is improved, and the industrial production requirement is met.

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 discloses a method for recovering platinum and palladium from high-cobalt nickel-containing carbonylation slag, and relates to the technical field of non-ferrous metal carbonylation metallurgy, the method comprises the following steps: S1, hydrogen reduction and activation; s2, feeding into a high-pressure carbonylation reactor; and S3, efficient carbonylation. According to the method, the carbonylation slag is subjected to hydrogen reduction activation treatment, nickel protoxide and cobalt oxide are changed into simple substance nickel, the simple substance nickel is fed into a carbonylation reactor for carbonylation under the protection of reducing gas or inert gas after activation treatment, 95% of Ni, 85% of Fe and 80% of Co are carbonylated to enter a gas phase after carbonylation, bonding of cobalt and a platinum solid solution is broken through carbonylation, and the nickel-cobalt-cobalt-cobalt-cobalt alloy is obtained. Nickel protoxide is difficult to dissolve in various strong acids and oxidizing acids, and a foundation is laid for further separation of base metals and non-metallic element sulfur from precious metals to produce high-grade platinum concentrate.

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 belongs to but not limited to the technical field of dissimilar metal welding, and discloses a method and system for improving the erosion resistance of a laser cladding cobalt-based alloy coating. Carrying out surface pretreatment on the base material; preparing a cobalt-based alloy cladding layer through a laser cladding technology; and the clad material is subjected to stress relief annealing treatment. Through the key step of annealing treatment after laser cladding of the cobalt-based alloy, generation of micro cracks and defects in a cobalt-based alloy cladding layer is effectively reduced, and therefore the coating which is tightly combined with a base body, excellent in mechanical property and remarkably improved in erosion resistance strength is prepared. The invention further provides an effective solution for solving the problem that cracks are easily generated due to improper heating rate and heat dissipation conditions in the laser cladding process of the cobalt-based alloy, and the quality and reliability of a cladding layer are remarkably improved. The technical innovation is of great significance in promoting high-quality development of the manufacturing industry, especially in the aspect of prolonging the service life of key parts and improving the performance of the key parts.

The invention relates to the technical field of tungsten carbide coatings, and discloses a tungsten carbide composite coating and a preparation method and application thereof. The tungsten carbide composite coating comprises the following raw materials in parts by mass: 5-10 parts of modified tungsten carbide, 1-2 parts of nickel-cobalt alloy and 0.2-0.5 part of titanium carbide. The minimum corrosion rate of the tungsten carbide composite coating in a 3.5% NaCl corrosion medium can reach 0.009 g / m < 2 > h, the minimum corrosion rate of the tungsten carbide composite coating in a 0.1 mo l / L NaOH corrosion medium can reach 0.017 g / m < 2 > h, the minimum corrosion rate of the tungsten carbide composite coating in a 0.1 mo l / L H2SO4 corrosion medium can reach 0.025 g / m < 2 > h, and the tungsten carbide composite coating has good corrosion resistance; according to the tungsten carbide composite coating provided by the invention, the corrosion rate change rate is only 30.0% in a corrosive medium of 3.5% NaCl, the corrosion rate change rate is only 10.0% in a corrosive medium of 0.1 mo l / L NaOH, the corrosion rate change rate is only 10.0% in a corrosive medium of 0.1 mo l / L H2SO4, and the tungsten carbide composite coating has good high-temperature oxidation resistance.

The present invention relates to the technical field of electro-acoustic transduction, and disclosed in the present invention are a sound generation unit and an electronic device. The sound generation unit comprises a housing and a magnetic circuit system, wherein at least part of the housing is formed of a cobalt alloy material; the magnetic circuit system is arranged in the housing and comprises a magnetic yoke, a central magnetic portion and a peripheral magnetic portion; the central magnetic portion and the peripheral magnetic portion are both arranged in the magnetic yoke, and the peripheral magnetic portion is arranged on an outer side of the central magnetic portion; and the peripheral magnetic portion is connected to the housing. The present invention aims to provide a sound generation unit that meets the requirements of slim design and acoustic performance. The sound generation unit effectively increases the magnetic induction intensity of the magnetic circuit system while having the slim design, thereby improving the BL value, and meeting the requirements of the acoustic performance of the sound generation unit.

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 preparation method and application of a pine needle nanosheet composite copper-cobalt alloy phosphide hydrogen evolution catalyst, and relates to the technical field of electro-catalysis. The copper-cobalt alloy phosphide hydrogen evolution catalyst is obtained by adopting electrolyte containing a copper source, a cobalt source, a phosphorus source and an inorganic fluoride complexing agent, taking foamed nickel as a working electrode and carrying out electro-deposition by utilizing a constant voltage method. On the basis of low cost and a simple synthesis method, the electronic structure of the catalyst is adjusted, and the electron transfer efficiency and the stability of active sites are improved, so that an excellent water electrolysis hydrogen evolution effect is realized, and a new solution is provided for the development of the field of clean energy.

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 discloses a signal transmission control cable with high shielding performance, belongs to the technical field of electromagnetic shielding materials, and is used for solving the technical problem that the shielding performance and the impact resistance of a control cable in the prior art need to be further improved. The cable comprises a conductor layer formed by twisting a plurality of silver-coated copper wires, an insulating layer, a shielding layer and an outer sheath layer, iron-cobalt alloy is prepared, the surface of the iron-cobalt alloy is modified with a carbon layer, the surface of the carbon layer is modified with a silica group after the carbon layer is oxidized, and the carbon layer is uniformly dispersed in polydimethylsiloxane through modification of the silica group. The preparation method comprises the following steps: adding a micro-sphere foaming agent, mixing, carrying out liquid nitrogen freeze drying to obtain modified micro-powder, dispersing the micro-powder in nickel-cobalt-silicon structure fiber sponge, carrying out hot pressing to obtain flexible shielding foam, and preparing the control cable on the basis of the flexible shielding foam.

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 discloses an efficient composite wave-absorbing material NiCo-C-PANI and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method comprises the following steps: firstly, preparing NiCo-BTC by adopting a solvothermal method, dispersing the NiCo-BTC, and adding tris (hydroxymethyl) aminomethane and dopamine hydrochloride to obtain NiCo (at) PDA; secondly, carrying out high-temperature calcination on the NiCo-coated PDA to obtain NiCo-coated C; and finally, dispersing NiCo-C, adding hydrochloric acid, an aniline monomer and ammonium persulfate to obtain a mixed solution, and reacting to obtain a product. According to the preparation method disclosed by the invention, polydopamine is sequentially introduced to the surface of NiCo-BTC and is calcined to obtain a carbon-coated nickel-cobalt alloy composite material, and a layer of polyaniline is attached to the outer layer of the carbon-coated nickel-cobalt alloy composite material; due to the synergistic effect of interface polarization generated among all levels of the core-shell structure, dielectric loss of the carbon layer and polyaniline and magnetic loss of the core alloy, the material has good impedance matching performance and attenuation capacity; electromagnetic parameters of the composite material are regulated and controlled by adjusting the proportion of nickel and cobalt metal particles and changing the proportion of nickel and cobalt metal to carbon and polyaniline dielectric components, and the wave absorbing performance is improved.

The invention relates to the field of metallurgy, in particular to amorphous soft magnetic alloys based on Fe-Co, obtained by casting the melt onto the surface of the crystallizer and its high-speed quenching, which are used as an integral part of various devices, in particular transformers, motors, generators - devices whose characteristics are based on the effect of electromagnetic induction. The technical result of the proposed invention is to obtain an extremely high value of saturation magnetization of 1.94-2.01 T, while the coercive force is 6.6-10 A / m, the maximum permeability is 5000 ~ 14000. The present invention has the advantages of a simple heat treatment mode and a low annealing temperature, which significantly reduces the cost of the process. The technical result is achieved as follows: a soft magnetic material based on iron and cobalt, containing boron, silicon, phosphorus and carbon in the following ratio of components in at. %: Fe – 58.2 – 68.0; Со – 16.4 – 25.2; B – 13 – 16; Si – 0.9 – 1.1; P – 0 – 1.1; C – 0 – 1.1.

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.