970 results about "Iron powder" patented technology

The invention relates to the technical field of flux-cored wires. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 4-6 parts of chromium carbide powder, 7-9 parts of molybdenum powder, 6-8 parts of nickel powder, 10-15 parts of niobium powder, 15-18 parts of tungsten carbide powder, 7-11 parts of a modified titanium carbide agent, 5-8 parts of a blending agent added based on boron and 2-4 parts of 30-mesh natural graphite; 1-2 parts of sodium fluosilicate; 1-2 parts of aluminum powder; and 70-75 parts of iron powder. The flux-cored wire can adapt to complex service environments of parts such as rollers and continuous casting crystallizers in the metallurgical industry, the service life of the parts subjected to surfacing repair is prolonged, the production efficiency of the parts subjected to surfacing repair is improved, the obtained flux-cored wire achieves balance of high-temperature performance, mechanical performance and low-temperature stability, and the comprehensive applicability of products is improved.

The invention relates to the technical field of solid waste treatment and recycling, and discloses a waste incineration fly ash geopolymer composite material and a preparation method thereof, and the composite material is prepared from waste incineration fly ash, apatite minerals, zero-valent iron powder, persulfate and an alkali activator. The preparation method comprises the following steps: mixing the waste incineration fly ash, apatite minerals, zero-valent iron powder and persulfate to obtain composite powder; performing frequency conversion mechanochemical synergistic activation on the composite powder, wherein the activation process comprises a low-temperature activation stage and a high-energy pulse activation stage; and finally, mixing the activated powder with an alkali activator, pouring, molding and curing. According to the method, the reduction reaction and the oxidation reaction are driven step by step in the same system by regulating and controlling the mechanical energy input time sequence, the compatibility problem of a reducing agent and an oxidizing agent is solved, different types of persistent organic pollutants are synergistically degraded, meanwhile, heavy metal is stabilized, and the treatment effect is good. And the fly ash is recycled to prepare a geopolymer material with mechanical properties.

The invention relates to the technical field of non-oxide ceramic-based composite materials, in particular to Fe-N-based high-entropy nitride ceramic as well as a preparation method and application thereof. The method comprises the following steps: by taking iron powder as a sintering aid, mixing (Hf < 0.2 > Zr < 0.2 > Ti < 0.2 > Nb < 0.2 > Ta < 0.2 >) N high-entropy powder with the iron powder, and carrying out ball milling treatment to obtain ball-milled powder; and under the oxygen-free condition, the ball-milled powder is subjected to sintering treatment, transformation from the loose ball-milled powder to compact and uniform solid solution ceramic is achieved in the sintering treatment process, and the Fe-N-based high-entropy nitride ceramic is obtained. According to the method, a nitride thermal reduction method sintering process is adopted, energy is provided for densification of the Fe-N-based high-entropy nitride ceramic by utilizing reaction heat release of the (Hf0. 2Zr0. 2Ti0. 2Nb0. 2Ta0. 2) N high-entropy powder and the iron powder, the sintering temperature is reduced, energy is saved, and the defect that densification needs to be carried out under a high-temperature condition in the prior art is overcome.

The invention discloses an injection molding high-density alloy steel sintering integrated preparation process, which comprises the steps of alloy raw material proportioning, feed preparation, injection molding, continuous thermal desorption sintering treatment and enhanced heat treatment, and comprises the following steps: selecting gas atomization pure iron powder subjected to vacuum reduction treatment, and matching with chromium, nickel, molybdenum, vanadium, carbon, silicon, manganese and iron powder multi-component alloy proportioning; a phenolic resin-polyformaldehyde composite binder is adopted, 0.5-1.5% of a lubricating additive is added, internal mixing parameters are controlled under the protection of inert gas according to the powder-to-rubber ratio of 72-77%: 23-28%, and the problem that the compatibility of a single binder and alloy powder is poor is solved; three-section gradient temperature control injection molding and a continuous atmosphere furnace sectional degreasing-sintering integrated process are combined, and strengthening heat treatment is matched, so that sufficient diffusion of elements and densification of a green body are realized, and defects are avoided. The technology effectively solves the technical problems that traditional raw materials are high in impurity content and insufficient in element diffusion, and therefore the alloy steel sintering preparation efficiency can be improved.

The invention relates to the technical field of diamond saw blades, in particular to a laser welding diamond saw blade for ultra-narrow slit cutting and a preparation method of the laser welding diamond saw blade. The copper-cobalt-tin alloy material comprises the following raw materials: copper-cobalt-tin alloy powder, tungsten carbide powder, titanium-aluminum nitride, spherical cobalt powder, rare earth yttrium powder, ferrophosphorus powder and diamond abrasive particles. According to the preparation method, the core of the preparation method lies in the combination of powder metallurgy prefabrication of the tool bit and the precise laser welding process, especially the innovative laser welding process, and the prepared diamond saw blade is high in welding seam strength, narrow in heat affected zone and extremely small in matrix deformation; the problems of base body deformation, insufficient welding seam strength, short service life and the like of a traditional saw blade in the ultra-narrow seam cutting process are solved, and the saw blade is perfectly suitable for ultra-narrow seam cutting scenes with extremely high requirements for precision and stability.

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 provides a foundation pit water gushing iron ore grading thixotropic blockage reduction method which comprises the steps that iron ore tailings are crushed and screened into multi-stage particle size particles, and a customized mold is subjected to 3D printing based on foundation pit scanning data; paving particles in a mold layer by layer, doping iron powder, and cementing and curing cement paste to form a prefabricated body; the prefabricated body is installed to a water gushing area, the slurry viscosity is increased through a grading contact network, a weak gravitational flow state is triggered to be transiently changed to an anti-scouring state, and water flow speed reduction is achieved; alternating field induction micro-vibration is synchronously started during lateral grouting, and grout permeation and bubble discharge are driven; after solidification, the guide core body is pulled away, and remaining pore channels are self-compacted by a grading system to form an anti-seepage structure. The method has the advantages that the anti-scouring performance is enhanced; particle-slurry-foundation pit curved surface triple self-adaptive combination is carried out; the engineering cost is reduced.

The invention discloses a powder metallurgy brake shoe for a locomotive and a preparation method, and relates to the technical field of metallurgy brake shoes, the powder metallurgy brake shoe comprises the following raw materials by mass percentage: 50%-70% of a matrix component, 10%-18% of a reinforcing component, 10%-16% of a lubricating component and 10%-16% of a friction component; the matrix component comprises electrolytic copper powder; the reinforcing components comprise reduced iron powder, superfine iron powder, atomized nickel powder, molybdenum powder and zinc powder; the lubricating component comprises artificial graphite and sulfide. According to the invention, the performance reduction of the brake shoe and the decline of a matrix at high temperature are effectively inhibited, the stability of a friction coefficient is kept, the abrasion is reduced, and the service life is prolonged.

The application belongs to the field of metal materials, and discloses a method for preparing porous iron by impregnating organic foam, which comprises the following steps: step 1: impregnating slurry into a polyurethane foam template after roughening, to obtain a slurry-attached foam template; the slurry is an aqueous solution containing water-soluble resin, iron powder, ferric oxide, surfactant and thickening agent; the water-soluble resin contains a curing agent; step 2: performing rolling and drying operations on the slurry-attached foam template obtained in step 1, to obtain a green body; and step 3: performing combustion, reduction and sintering operations on the green body obtained in step 2. By using a foaming surfactant, the foaming effect of the foaming surfactant is utilized to solve the problem of closed pores and increase the porosity, and the water-soluble resin is used in combination, so that the material has certain toughness and tensile strength while the porosity is increased, and the porous iron material with high porosity and high strength is obtained. Meanwhile, the application also discloses a porous iron.

The invention relates to the technical field of ferrous metallurgy and solid waste treatment, in particular to an efficient utilization production process of iron-containing ore powder and slag powder, which comprises the following steps: preheating the iron-containing ore powder ground by a grinder by a preheater, and feeding the iron-containing ore powder into a reduction furnace; a fan provides aerodynamic force, high-temperature gas obtained after air is preheated by a hot-blast stove and hydrocarbon such as pulverized coal sprayed from a pulverized coal feeding port are combusted, and generated reducing gas such as CO and H2 enters a reduction furnace through an annular exhaust outlet of a hearth and is subjected to a reduction reaction with iron-containing ore powder entering the reduction furnace and the high-temperature gas such as CO and H2 at high temperature; and reducing into metal iron powder and slag. Iron ore powder does not need to be made into prefabricated lump ores such as pellets and sinter, and dependence of a blast furnace on metallurgical coking coal is avoided; iron ore powder can be directly used for producing metal iron powder, water is saved, and the risk that high-temperature molten iron explodes when encountering water is eliminated; green hydrogen can be used as a reducing agent, and the method is a preferable scheme in the ferrous metallurgy industry.

The invention provides a magnetic resin composition, a magnetic film and application thereof. The magnetic resin composition comprises (A) a magnetic filler, (B) epoxy resin, (C) a curing agent and (D) a flexibilizer, the magnetic filler (A) comprises carbonyl iron powder (A1), FeSiCr alloy (A2) and iron-based nanocrystals (A3); based on the total mass of the magnetic resin composition as 100%, the content of the (A) magnetic filler is 85% or more; based on 100% of the total mass of the magnetic filler (A), the content of the carbonyl iron powder (A1) is 55%-65%, the content of the FeSiCr alloy (A2) is 15%-25%, and the content of the iron-based nanocrystalline (A3) is 15%-25%. According to the magnetic resin composition and the preparation method thereof, specific types of magnetic fillers are introduced and compounded according to a specific content, so that the magnetic resin composition has relatively high magnetic conductivity and relatively low magnetic loss after being cured, and meanwhile, the binding force with a copper layer is relatively high.

The invention relates to a low-loss FeSi-CIP composite soft magnetic powder core and a preparation method thereof. The adopted raw material powder is composed of amorphous nanocrystalline atomized FeSi series powder and filling powder composed of carbonyl iron powder and iron-silicon-aluminum powder. The carbonyl iron powder accounts for 15-25% of the mass of the raw material powder, the iron-silicon-aluminum powder accounts for 5-15% of the mass of the raw material powder, and the filling powder accounts for 25-35% of the mass of the raw material powder. Two-stage warm-pressing pressing is adopted, self-tempering is achieved to a certain extent at the specific warm-pressing temperature, and high direct-current bias performance and low iron loss can be obtained without heat treatment annealing after pressing forming. The effective magnetic conductivity of the powder core is 42 or above, the loss is as low as 350 mW / cm < 3 > (50 mT, 100 kHz), and the direct current bias performance under the external field of 100 Oe reaches 90% or above.

The invention relates to the technical field of diamond saw blades, and provides a diamond saw blade and a preparation method thereof. The diamond saw blade comprises a disc base body and a tool bit fixed to the periphery of the disc base body, and the tool bit is prepared from, by weight, 30-45 parts of iron powder, 15-25 parts of copper powder, 8-12 parts of nickel powder, 8-15 parts of cobalt powder, 3-5 parts of tin powder, 2-5 parts of molybdenum powder, 1-3 parts of silicon-boron alloy powder, 0.5-2 parts of tungsten carbide powder, 20-25 parts of diamond particles and 0.05-0.1 part of liquid paraffin. According to the diamond saw blade provided by the invention, the scientificity and the accuracy of proportion matching of all the components in the raw material formula of the tool bit are improved, the stability of the sintering process is improved, and the condition that the hardness and the toughness of the tool bit are difficult to achieve the optimal balance is improved.

The invention relates to a high-Ni alloy flux-cored wire for 9% Ni steel welding, which is prepared by coating a flux core with a nickel-based steel strip, and the flux core comprises the following components in percentage by weight: 18.0-30.0% of metal nickel powder, 5.0-8.0% of metal chromium powder, 5.0-9.0% of metal molybdenum powder, 1-2% of metal tungsten powder, 20.0-30.0% of rutile, 1.0-3.0% of quartz, 2.0-5.0% of albite, 1.0-3.0% of potassium feldspar, 0.5-3.0% of mica, 1.0-4.0% of cryolite, 0.2-0.8% of self-made raw material and the balance of reduced iron powder and inevitable impurities. The flux-cored wire belongs to a hastelloy system and is particularly suitable for welding of horizontal position welding and vertical position welding of the marine LNG storage tank, the mechanical performance of cladding metal of the flux-cored wire can reach 50 J or above at the low-temperature impact of-196 DEG C, the tensile strength is larger than 700 MPa, and the flux-cored wire is excellent in crack resistance and comprehensive performance.

The invention discloses an ultrasonic abrasive flow surface texture machining device and method based on an auxiliary magnetic field, and belongs to the field of precision machining and surface engineering. The ultrasonic abrasive flow surface texture machining device comprises a workbench, an ultrasonic vibration generating device, a magnetic field generating device, an abrasive flow machining system and a three-dimensional motion platform. The composite abrasive particle suspension is composed of a basic solution, carbonyl iron powder magnetic particles and silicon carbide abrasive particles. According to the method, magnetic particles are guided by a magnetic field to form a chain along magnetic lines of force, ultrasonic high-frequency impact is combined, abrasive materials are driven to impact the surface of a workpiece in order, a submicron texture with the consistent direction and the uniform size is formed, the depth ranges from 0.2 micrometer to 2 micrometers, and the width ranges from 1 micrometer to 20 micrometers. Texture parameters are flexibly regulated and controlled through magnetic field and ultrasonic parameters, and the method has the advantages of being high in machining precision, high in controllability, low in cost, environmentally friendly and recyclable, is suitable for precise parts of bearings and cutters, and can remarkably improve the tribological performance and wettability of the parts.

Disclosed is an oxygen scavenger composition including iron powder, activated carbon, water, a halide of an alkaline earth metal, and an alkaline substance, in which a content of the activated carbon is 20 parts by mass or more and 40 parts by mass or less with respect to 100 parts by mass of a content of the iron powder, a content of the water is 230 parts by mass or more and 370 parts by mass or less with respect to 100 parts by mass of the content of the activated carbon, and a content of the halide of the alkaline earth metal is 50 parts by mass or more and 65 parts by mass or less with respect to 100 parts by mass of the content of the water.

A zero-carbon flash reduction ironmaking device comprises a reaction tower, the reaction tower is arranged upside down, a flash reduction area, an iron powder waste heat boiler and a green oxygen preheater are sequentially arranged in an inner cavity of the tower from top to bottom, oxyhydrogen powder entering the tower is subjected to oxyhydrogen combustion, mineral powder green hydrogen absorbs heat and is heated to the high temperature, and all hydrogen reduction reaction is completed before the mineral powder flows out of the flash reduction area. Iron powder is cooled through an iron powder waste heat boiler and a green oxygen preheater, hydrogen steam is cooled through a hydrogen steam waste heat boiler and a mineral powder preheater, and hydrogen water is separated through a cyclone dehydrator and a drying filter. The iron ore concentrate powder with the particle size smaller than 200 meshes falls into a powder bin, the reduction temperature ranges from 1100 DEG C to 1200 DEG C, the time for the ore powder to flow through a flash reduction area ranges from 2 s to 3 s, and the temperature for the ore powder to leave an iron powder waste heat boiler and the temperature for hydrogen steam to leave a hydrogen steam waste heat boiler range from 125 DEG C to 175 DEG C. The invention can be used for flash smelting of iron ore concentrate powder. The invention has the advantages of high waste heat recovery rate, long service life of the furnace lining, low energy consumption and zero carbon emission, and can avoid using the key management object coke ironmaking blast furnace device of the national two-high project.

The invention discloses an ultralow-temperature high-toughness non-magnetic steel flux-cored wire for a controllable nuclear fusion device and a preparation method of the ultralow-temperature high-toughness non-magnetic steel flux-cored wire. A special stainless steel strip is adopted to wrap a metal powder type flux core, and the flux core accounts for 29.6%-30.4% of the total mass of the flux-cored wire; the flux core comprises the following components: 14%-18% of electrolytic manganese, 21%-23% of chromium metal, 0.3%-1.0% of ferrotitanium, 4.4%-5.0% of nitrided ferrochromium, 27.5%-28.5% of nickel powder, 0.5%-1.0% of 52 # ferrosilicon, 8%-9% of molybdenum powder, 0.1%-0.3% of lithium fluoride and the balance of atomized iron powder. The problems that an existing non-magnetic steel welding material is insufficient in toughness and high in magnetic conductivity at the ultralow temperature of-269 DEG C are solved by optimizing flux-cored alloy elements of (nickel-chromium-nitrogen) synergistic stable austenite, matching with a manufacturing process of sealed baking and roller die drawing forming of powder at the temperature of 120-140 DEG C and a welding process protected by argon (Ar) with the purity of 99.999%. The AKV2 of a welded joint is larger than or equal to 34J at the temperature of-269 DEG C, the tensile strength is larger than or equal to 620 MPa, the relative permeability is smaller than or equal to 1.02, the problems that nitrogen of an existing solid welding wire is difficult to control, and hardening is easy can be solved, and the welding wire is completely matched with the extreme working condition of a controllable nuclear fusion device.

The invention relates to high-superposition low-loss Fe-Si-Al metal soft magnetic powder and a preparation method thereof.The soft magnetic powder is composed of Fe-Si-Al powder and carbonyl iron powder, and the mass ratio of the Fe-Si-Al powder to the carbonyl iron powder is (6-8): (2-4); the Fe-Si-Al powder comprises, by mass, 6%-9% of Si, 4%-6% of Al, 0.5%-1.1% of Cr, 0.2%-1.5% of Ni, 0.6%-2.0% of Mo, 0.5%-0.8% of Ti, 1%-1.4% of Co and the balance Fe. The total content of Cr, Ni, Mo and Ti is 2.3-4.5%; the particle size of the carbonyl iron powder is 13-18 [mu] m. The soft magnetic material prepared from the high-superposition low-loss Fe-Si-Al metal soft magnetic powder can simultaneously give consideration to high superposition and low loss, the effective magnetic conductivity under 1MHz is 95-112, and the power loss under 1MHz / 100mT is 250-280mW / cm < 3 >.

Methods for the production of rare earth magnetic materials including magnetic crystals of Nd2F14B and the magnetic materials produced thereby. The methods lead to the formation of magnetic materials having a high concentration of Nd2F14B crystals. The method comprises steps of: admixing a neodymium borate powder, iron powder and calcium hydride to form a precursor powder; compacting the precursor powder to form a compacted precursor powder body; and heating the compacted precursor powder body to form a consolidated powder body.

The invention discloses silicon dioxide modified carbonyl iron powder as well as a preparation method and application thereof. According to the modified material, micron-sized carbonyl iron powder serves as a core, the surface of the modified material is coated with a nano-sized silicon dioxide layer through an improved Stober method, a core-shell structure is formed, the thermal stability and corrosion resistance of the carbonyl iron powder are remarkably improved, and the initial oxidation temperature of the carbonyl iron powder is not lower than 300 DEG C and is increased by at least 50 DEG C compared with an unmodified product. The preparation method comprises the steps of dispersion, mixed catalysis, coating reaction and post-treatment, and is simple in process and high in controllability. The invention further provides application of the modified carbonyl iron powder in an epoxy resin-based anticorrosive coating, when the filling amount is 0.1-2.0% (preferably 1.00%), the coating shows excellent anticorrosive performance in a 3.5 wt% NaCl solution, the low-frequency impedance modulus value is not lower than 7.0 * 10 < 5 > omega.cm < 2 >, and the corrosion current density is not higher than 2.15 * 10 <-8 > A / cm < 2 >. The method effectively solves the problems that the carbonyl iron powder is easy to oxidize and agglomerate and poor in corrosion resistance, and is suitable for the high-performance anti-corrosion and wave-absorbing integrated coating.

A method for extracting iron from copper tailings belongs to the field of copper tailings recovery treatment, and comprises the following steps: step 1, collecting copper tailings and crushing; step 2, adding a reducing agent and an auxiliary agent into the copper tailing powder crushed in the step 1, and fully mixing; (3) feeding the mixed material obtained in the step (2) into a sealed kiln for sealed reduction; fourthly, after reduction operation in the third step is completed, the mixed material is taken out and smashed again; fifthly, the mixed materials smashed in the fourth step are subjected to magnetic separation, and iron powder is obtained; and 6, residual substances obtained after magnetic separation in the step 5 are recycled. Compared with a traditional melting smelting mode, the low-temperature reduction mode is low in temperature, so that generated iron powder and slag can be kept in a solid state in the reduction process, the ring forming problem easily occurring in sealed kiln melting reduction and the defect that a rotary hearth furnace is difficult to discharge are overcome, energy consumption is reduced, and production efficiency is improved.

The utility model discloses an automatic deashing device which comprises an electric channel (1), a traveling crane body (2), a sliding block (3) fixedly connected with the traveling crane body (2) and a fan (4) fixedly connected to the sliding block (3), the fan (4) is electrically connected with the traveling crane body (2), and when the traveling crane body (2) travels, the fan (4) is started; an outlet of the fan (4) faces the sliding block (3), and the fan (4) can clean the contact position of the sliding block (3) and the electric channel (1). The automatic ash cleaning device can timely clean iron powder accumulated on the electric track when the travelling crane body runs, and the iron powder is prevented from being accumulated on the electric track.

The present application relates to a kind of rack steel layered casting composite flux and its preparation, method for using, the component and content of composite flux are as follows: high-purity iron powder: 40%~50%, high-purity rare earth powder: 20%~30%, analytical pure sodium pyrovanadate: 20%~40%.Using layered casting process of composite flux with rack steel, the macrosegregation and shrinkage cavity defects of large rack steel ingot can be significantly improved, which provides a simple, feasible and effective way to improve the composition homogenization degree of ingot, helps to improve the overall quality of rack steel ingot, also shortens the production cycle and improves the production efficiency, thereby improves the production capacity of large rack steel ingot, reduces the production energy consumption and production cost;The present application has important significance for breaking through the bottleneck of high homogenization large rack steel ingot manufacturing, laying the new technical theoretical foundation and industrialization application of large rack steel ingot casting, and improving the manufacturing technology level of key components of large equipment in China.

An object of the present disclosure is to provide a volatile organic compound decomposing / purifying material capable of efficiently decomposing VOCs.SOLUTION: A volatile organic compound decomposing / purifying material according to one aspect of the present disclosure is a pre-alloyed iron powder containing, as metal elements, Ni: 0.2 mass% or more and 3.0 mass% or less and Mo: 0.2 mass% or more and 2.0 mass% or less.SELECTED DRAWING: Figure 1

The application discloses a wear-resistant copper alloy material and a preparation method thereof, and belongs to the technical field of alloy manufacturing. The wear-resistant copper alloy material comprises a copper-aluminum alloy and a surface coating. The copper-aluminum alloy comprises the following components: electrolytic copper powder, aluminum material, iron powder, manganese powder and graphene / Ni-Fe layered double hydroxide composite. The aluminum material comprises pure aluminum and coconut shell fiber / waste aluminum composite, and the mass ratio of the pure aluminum to the coconut shell fiber / waste aluminum composite is 1:(5-6). The surface coating comprises the following components: lignin-modified MXene / metal organic framework / g-C3N4 composite material, epoxy-modified isocyanate oligomer and silane coupling agent-modified nano-silicon sol. The application solves the problem of internal and external defects caused by waste aluminum in the preparation process of the copper-aluminum alloy.

This invention provides a high-hardness, crack-free flux-cored welding wire and its preparation method. The flux-cored welding wire includes an outer sheath and a flux core. By weight, the flux core comprises the following components: boron carbide 5.6-8.6 parts; 75% ferrosilicon 3.1-4.6 parts; electrolytic manganese 0.6-1.6 parts; 80% ferrovanadium 0.3-1.2 parts; nickel powder 0.3-1.0 parts; 68% high-carbon ferrochrome 67.5-94.5 parts; and iron powder 6-6.5 parts. The preparation method of the flux-cored welding wire is as follows: [The following components are listed:] boron carbide, 75% ferrosilicon, electrolytic manganese, 80% ferrovanadium... Ferrovanadium, nickel powder, 68% high-carbon ferrochrome, and iron powder are added sequentially to a dryer and dried for 2-3 hours. The mixture is then thoroughly mixed using a three-dimensional motion mixer and placed in an insulated box for later use. The outer sheath is placed on a forming machine, which rolls the outer steel strip into a U-shaped groove. Flux-cored powder is added to the U-shaped groove, and the forming machine closes and pulls the groove to obtain the flux-cored welding wire. The flux-cored welding wire of this invention features high hardness, no cracks, high temperature resistance, and corrosion resistance. Furthermore, the low production cost of the flux-cored welding wire facilitates industrial production.

The invention provides a process method for producing ferrotitanium powder by reducing ilmenite, which comprises the following steps of: uniformly mixing ilmenite concentrate with a biomass-coal mixed reducing agent, a nanoscale additive and the like, reducing in a rotary kiln under a temperature-controlled and oxygen-controlled atmosphere, quenching and cooling a product by water, and performing multi-stage ore grinding magnetic separation to obtain metal iron particles and a titanium-rich material; and preparing the two into a ferrotitanium powder product. The process integrates innovative units of raw material homogenization pretreatment, biomass-coal mixed reducing agent dynamic proportioning, LIBS + Raman spectrum on-line monitoring closed-loop control, nano CaO-Na2O composite catalyst buffer addition, finished product multistage magnetic separation reforming and the like. The product composition fluctuation is obviously reduced, the TiO2 content fluctuation is controlled within + / -0.4%, the FeO content fluctuation is controlled within + / -0.5%, the metallization ratio is improved to 90% or above, the heat efficiency is improved by about 20%, and the energy consumption per unit yield is reduced by about 15%. The ilmenite is directly, efficiently and cleanly utilized, a high-quality titanium-rich raw material can be provided for production of titanium dioxide, titanium sponge and the like, meanwhile, the byproduct high-grade iron powder is used for steelmaking, and the comprehensive utilization benefit of resources is remarkable.

The invention discloses a friction material for brake pads and application thereof and belongs to the technical field of friction materials. The composite material is prepared from the following components in percentage by weight: 15 to 20 percent of composite fiber of chopped carbon fiber and ceramic fiber, 1 to 3 percent of carboxylation modified multi-walled carbon nanotube, 8 to 12 percent of polyimide modified phenolic resin, 0.5 to 1 percent of silane coupling agent KH-550, 5 to 8 percent of bionic multilayer graphene capsule, 3 to 5 percent of rare earth doped molybdenum silicide composite material, 8 to 12 percent of scaly soft iron powder and 10 to 15 percent of thermoelectric regulation type ZrO-BeO composite material. The catalyst comprises the following components in percentage by weight: 2-4% of porous molecular sieve loaded nano SbO, 5-10% of composite alkaline earth metal oxide, 5-10% of a shaped phase change material and 0.1-0.5% of a high-thermal-conductivity silicon carbide coating, a micron-sized through channel network with a high-thermal-conductivity silicon carbide coating is constructed in the material, and a shaping phase change material is combined, so that a multi-stage synergistic heat management mechanism of conduction heat dissipation, phase change heat storage and capillary flow enhanced heat dissipation is formed, friction heat can be quickly guided out from the surface and uniformly dispersed, and local high temperature and thermal stress are greatly relieved.

This invention relates to the field of powder forging technology and discloses a high-precision forklift mast support processing method, including the following preparation steps: mixing iron powder, chromium powder, cobalt powder, titanium powder, manganese powder and reinforcing agent, drying and ball milling to obtain a mixture; pressing the mixture on a press to form a forklift mast support preform, then placing the preform in a sintering furnace for sintering to obtain a sintered blank; heating the sintered blank to the forging temperature, placing it in a forging die for forging, and then heat-treating to obtain a high-precision forklift mast support. The high-precision forklift mast support obtained by mixing iron powder, chromium powder, cobalt powder, titanium powder, manganese powder and reinforcing agent to form a uniform mixture, pressing and sintering the mixture to form a sintered blank, and placing the sintered blank in a forging die for forging has high mechanical strength and good interfacial bonding, making it less prone to cracking.