2225 results about "Iron powder" patented technology

The invention discloses a method for preparing a solid waste cementing material from micro-carbonized steel slag, and belongs to the technical field of building materials. The preparation method comprises the following steps: carrying out crushing, iron separation and grinding treatment on steel slag particles to obtain steel slag powder; mixing the steel slag powder with water and a carbonization aid to obtain a steel slag wet mixture; feeding the wet steel slag mixture into a carbon dioxide curing kettle for curing and intensely stirring, quickly carbonizing to obtain micro-carbonized steel slag particles, and grinding and drying to obtain micro-carbonized steel slag powder; 45-70 parts of micro-carbonized steel slag, 15-35 parts of slag, 1-8 parts of gypsum, 1-8 parts of cement or clinker, 1-15 parts of fly ash or metal tailings, 1-10 parts of an alkaline solution and 25-30 parts of water are mixed to obtain the micro-carbonized steel slag solid waste cementing material. The micro-carbonized solid waste steel slag cementing material prepared by the invention has the advantages of low cost, simple preparation process and equipment, better early and later mechanical properties, good stability, low carbon, high additional value and the like.

The invention discloses a numerical calculation method for simulating combustion of iron powder group particles, belongs to the field of numerical simulation calculation of iron powder combustion, can perform numerical simulation on single-particle and iron powder group combustion under a microgravity condition, quantitatively analyzes the influence of differential diffusion on single-particle iron powder and iron powder group combustion flame temperature, and improves the calculation accuracy of the single-particle and iron powder group combustion flame temperature. And meanwhile, the influence of iron powder combustion characteristics and flame propagation speeds under different iron powder and oxygen concentration conditions is considered. The method has a certain guiding significance in research on low-propagation-speed lean-burn iron powder flames and subsequent application of iron powder fuel. The microgravity environment can eliminate the influence of convection and buoyancy, so that the combustion process is more stable and predictable, and the basic mechanisms of iron powder combustion, including combustion rate, oxidation process, phase change and the like, can be deeply researched.

Disclosed are a flux-cored welding strip and a welding flux used in combination for submerged arc welding of a duplex stainless steel, and preparation methods and use thereof. The flux-cored welding strip is composed of a stainless steel shell and a flux core powder, the flux core powder consisting of the following components: in percentages by mass, ferrochrome nitride: 0.70% to 1.0%, a chromium powder: 26% to 27%, a nickel powder: 4.5% to 5.5%, a molybdenum powder: 3.7% to 4.2%, a manganese powder: 2.55% to 2.65%, a copper powder: 1.45% to 1.55%, a ferrosilicon powder: 1.1% to 1.2%, a tungsten powder: 1.0% to 1.15%, a niobium powder: 0.25% to 0.35%, an aluminum powder: 0.35% to 0.55%, a rhenium powder: 0.35% to 0.40%, a lanthanum powder: 0.1% to 0.15%, and a balance being an iron powder.

The invention relates to the technical field of tungsten alloy, and discloses a tungsten alloy material and a preparation method thereof.The tungsten alloy material comprises, by mass, 90-100 parts of modified tungsten powder, 8-10 parts of nickel powder, 5-7 parts of iron powder, 4-6 parts of cobalt powder and 1-3 parts of modified carbon fibers. The nickel powder, the iron powder and the cobalt powder in the molten state permeate into the tungsten powder through pores evenly distributed in porous carbon on the surface of the modified tungsten powder to form a uniform and compact alloy material, and the situation that due to the large melting point difference between the tungsten powder and the nickel powder, the iron powder and the cobalt powder, the nickel powder, the iron powder and the cobalt powder are distributed unevenly in the tungsten alloy material, and the mechanical strength of the alloy material is reduced is avoided; the pretreated silicon carbide whiskers are adhered to the surface of the carbon fiber loaded with the graphene oxide to form modified carbon fiber, so that interface stress can be absorbed and dispersed, stress concentration is reduced, cracks and debonding phenomena at an interface are prevented, and the mechanical performance of the tungsten alloy material is enhanced.

The invention relates to the field of building materials, and discloses a multifunctional foamed ceramic sound insulation and heat preservation material for buildings. Comprising the following raw materials in parts by weight: 42 to 48 parts of pottery clay tailings, 14 to 16 parts of fly ash, 10.5 to 12 parts of crushed stone materials, 2.8 to 3.2 parts of a silicon carbide foaming agent, 0.7 to 0.8 part of a borax fluxing agent, 7 to 8 parts of paraffin / silicon dioxide phase change microcapsules, 0.5 to 1.0 part of graphene, 2.0 to 2.5 parts of nano iron powder, 0.05 to 0.5 part of nano silver, 1.0 to 1.5 parts of photocatalytic titanium dioxide and 0.3 to 0.4 part of a fluorosilane coupling agent. A stable matrix structure is constructed through the argil tailings, the fly ash and the crushed stone materials, the silicon carbide foaming agent and the borax fluxing agent reduce the heat conductivity coefficient, the sound insulation performance is improved, the material is endowed with the antibacterial ability through nano-silver and photocatalytic titanium dioxide, indoor sanitation is guaranteed, and a super-hydrophobic layer is constructed through the fluorosilane coupling agent.

The invention provides a mining inorganic environment-friendly reinforcing material and application thereof, and belongs to the technical field of mining reinforcing materials. A component A comprises the following components in parts by mass: 60-80 parts of anhydrite, 5-20 parts of lime, 5-10 parts of silica fume, 2-8 parts of sodium silicate, 1-0.5 part of a naphthalene water reducer, 3-7 parts of an early strength agent and 0.2-0.8 part of lithium salt; the component B comprises the following components in parts by mass: 50-70 parts of cement clinker, 10-30 parts of slag cement, 5-10 parts of iron powder, 1-8 parts of aluminum sulfate, 5-10 parts of calcium carbonate and 0.5-1 part of sodium tripolyphosphate; the component C is prepared from the following components in parts by mass: 10 to 25 parts of water glass, 10 to 20 parts of emulsion, 40 to 60 parts of water, 5 to 10 parts of high-efficiency water reducing agent and 1 to 5 parts of triethanolamine. The mining inorganic environment-friendly reinforcing material provided by the invention is low in reaction heat and is not easy to cause coal combustion.

The invention relates to the technical field of diamond precision machining, and provides a polishing solution for diamond and a diamond chemical mechanical polishing method. The polishing solution for the diamond is formed by mixing and uniformly stirring deionized water, diamond micro-powder, iron powder, a catalyst and a dispersing agent; the grinding aid comprises the following components in percentage by weight: 50%-68% of deionized water, 10%-40% of diamond micro powder, 10%-35% of iron powder, 2%-5% of a catalyst and 0.1%-0.5% of a dispersing agent. By adding the iron powder into the polishing solution, the iron powder can reduce the activation energy of diamond graphitization and catalyze the diamond surface, and the catalytic action aggravates the conversion from diamond to graphite, so that the diamond surface becomes very soft, and carbon atoms on the diamond surface are easier to separate. And the polishing and removing process of the diamond material is accelerated through the catalysis effect of the iron powder, so that ideal surface quality and precision can be achieved in a short time during diamond polishing.

The present invention discloses a sulfurized nano zero-valent iron material, its preparation method and application, including: a core-shell structure sulfurized nano zero-valent iron material and a preparation method, the inner core of the sulfurized nano zero-valent iron is zero-valent iron, and the outer shell is Fe9S 10 , calculated by the mass of the sulfurized nano zero-valent iron, the mass percentage of zero-valent iron is 70-80%, and the mass percentage of the iron sulfide is 20-30%; the preparation method includes: placing iron powder in an H2S gas atmosphere for calcination, after the calcination is completed, cooling to room temperature to obtain the sulfurized nano zero-valent iron material. This material can be used for in-situ remediation of chlorinated hydrocarbon organic pollutants in groundwater. Compared with the prior art, the prepared sulfurized nano zero-valent iron is less likely to be oxidized and can overcome the problem of rapid passivation of nano zero-valent iron during the remediation process.

The invention belongs to the technical field of alloy materials, and particularly relates to a preparation method of a fine-grain near-alpha high-temperature titanium alloy. The preparation method of the fine-grain near-alpha high-temperature titanium alloy comprises the following steps that (1) a construction platform of SLM machining equipment is filled with alloy powder, and SLM machining is started; during SLM machining, the laser power ranges from 260 W to 380 W, the scanning speed ranges from 1000 mm / s to 1500 mm / s, and the scanning interval ranges from 0.05 mm to 0.15 mm; the alloy powder is a mixture of Ti60 alloy powder, boron powder and iron powder; (2) sequentially carrying out destressing treatment, solution treatment and aging treatment on a product obtained by SLM processing; the temperature of the destressing treatment and the temperature of the aging treatment are independently selected from 600-1000 DEG C, the temperature of the solution treatment is 1000-1300 DEG C, and the temperature of the solution treatment is larger than the temperature of the destressing treatment and larger than the temperature of the aging treatment. By adjusting and controlling the laser power, the scanning speed and the scanning interval in the SLM machining and forming process and combining a reasonable and effective heat treatment process, the alloy material with the density superior to 99.95% is obtained.

The invention belongs to the technical field of transmission sheet materials, and aims to solve the problems that the service life of a clutch is affected and even potential safety hazards are caused due to poor comprehensive performance of an existing transmission sheet material for the clutch under the working conditions of high temperature, high stress and the like. In order to achieve the purpose, the invention provides a powder metallurgy transmission sheet material for a clutch and a preparation method of the powder metallurgy transmission sheet material. The powder metallurgy transmission sheet material for the clutch comprises, by mass, 55%-65% of high-purity atomized iron powder, 8%-12% of electrolytic copper powder, 4%-8% of hydroxyl nickel powder, 1.5%-4% of ferromolybdenum powder, 1%-3% of chromium powder, 0.3%-1.5% of lanthanum powder, 1.5%-3.5% of nanometer silicon carbide particles, 0.8%-2% of carbon fibers, 0.5%-1.5% of whisker-shaped aluminum oxide, 0.3%-1% of cellulose nanocrystals, 0.5%-2% of rare earth oxide, 2.3%-6% of a lubricating agent and 0.5%-1.8% of a binding agent. The comprehensive performance of the transmission piece for the clutch is greatly improved, the reliability and durability of the transmission piece in a complex mechanical environment are guaranteed, the service life is prolonged, and the safety risk is reduced.

The invention discloses a metal soft magnetic powder core and a preparation method thereof.The preparation method comprises the steps that cold sintering is conducted, under the ultrasonic-assisted condition, warm-pressing is conducted on mixed powder containing modified iron powder and a release agent, and a metal soft magnetic powder core green body is obtained; wherein the modified iron powder comprises iron powder and a coating layer, the surface of the iron powder is coated with the coating layer, and the coating layer comprises copper, hydrated ferric oxalate, hydrated cupric oxalate and iron oxide; and heat treatment is conducted, specifically, the metal soft magnetic powder core green body is subjected to heat treatment under the oxygen-containing condition, and the metal soft magnetic powder core is obtained. Ultrasonic assistance is introduced when the modified iron powder is subjected to cold sintering, and a mixed insulation coating layer of ferric oxide and copper oxide can be generated on the surfaces of powder particles in situ during heat treatment, so that the compactness, the strength, the resistivity and the magnetic conductivity of the magnetic core are improved while the pressing force is reduced and the pressing efficiency is improved.

The embodiment of the invention provides a method for reducing residual oil and residual iron on the surface of acid-rolled efficient non-oriented silicon steel, and relates to the field of silicon steel production. The method for reducing residual oil and residual iron on the surface of the acid-rolled efficient non-oriented silicon steel comprises the following steps: carrying out hot rolling on silicon steel; carrying out normalizing pickling on the silicon steel; pickling and continuous rolling are conducted on the silicon steel; the unit tension between the first cold-rolling mill and the second cold-rolling mill is 140N / mm < 2 >-160N / mm < 2 >, the unit tension between the second cold-rolling mill and the third cold-rolling mill is 150N / mm < 2 >-170N / mm < 2 >, the unit tension between the third cold-rolling mill and the fourth cold-rolling mill is 170N / mm < 2 >-190N / mm < 2 >, the unit tension between the fourth cold-rolling mill and the fifth cold-rolling mill is 180N / mm < 2 >-200N / mm < 2 >, and the coiling tension is 40N / mm < 2 >-50N / mm < 2 >. And the generation amount of the iron powder is inhibited.

The invention discloses a method for preparing high-quality iron phosphate in a short process, and belongs to the field of battery material manufacturing. The method comprises the following steps: dissolving iron powder with phosphoric acid to prepare a ferrous phosphate solution, then transferring the solution into a pressurized reaction kettle, blowing high-speed oxygen to oxidize ferrous phosphate into ferric phosphate, adding ammonia water to control the pH value to be 1.5-2.0, and carrying out solid-liquid separation to obtain the water-containing amorphous ferric phosphate, after washing is finished, a water-containing material is fed into a muffle furnace to be subjected to stepped calcination, dehydration and crystal transformation are completed, and the alpha monoclinic system iron phosphate is obtained. The method provided by the invention is short in process flow and low in energy consumption, the oxidant is easy to obtain and safe, the particle size uniformity of reaction materials is good, and the prepared iron phosphate is uniform in particle size, regular in structure and stable in iron-phosphorus ratio and is a high-quality precursor material.

The invention discloses a method for producing iron powder by solid reduction treatment of copper smelting slag in a rotary kiln. Copper slag powder is obtained by crushing the copper smelting slag; carrying out solid-state reduction on the pellets containing the copper slag powder in a rotary kiln; carrying out magnetic separation on the reduced material to obtain iron powder and tailings; the pellets are fed into the rotary kiln from the tail of the rotary kiln, air is blown into the rotary kiln from a kiln head, and the reduced materials are discharged from the kiln head; the raw materials of the pellets comprise copper slag powder, limestone powder and pulverized coal. According to the method, the copper smelting slag is subjected to solid-state reduction treatment through the rotary kiln to comprehensively recover and produce the iron powder, and treatment and resource recycling of the copper smelting slag are achieved; the reduction, harmlessness and recycling of the industrial waste residues are realized, the investment is saved, the energy is saved, the consumption is reduced, the operation cost is low, and the popularization is easy.

The invention provides a method for preparing an iron-chromium electrolyte and electronic-grade ferrous chloride by using a stainless steel waste liquid. The method comprises the following steps: firstly, adding elemental iron and / or elemental chromium into the stainless steel waste liquid to obtain a chromium-containing ferrous chloride solution; then, sulfide is added, and nickel is removed; adding iron powder to increase the pH value to obtain chromium hydroxide precipitate and a ferrous chloride solution; dissolving chromic hydroxide in hydrochloric acid to obtain a chromic chloride solution; purifying the ferrous chloride solution to obtain an electronic-grade ferrous chloride crystal; and finally, adding a chromium chloride solution, the electronic-grade ferrous chloride crystal and hydrochloric acid according to a certain proportion, and stirring and mixing to obtain the iron-chromium electrolyte. The ferrous chloride prepared by the steps is relatively high in purity and less in waste; meanwhile, the prepared electrolyte is good in electrical property, low in attenuation rate and low in cost, the purpose of comprehensive recycling of resources is achieved, and the general trend of technical improvement is met.

The invention discloses a uniformly distributed saw blade and a preparation method thereof, and relates to the technical field of saw blades. The evenly-distributed saw blade comprises a base body and tool bits, a plurality of tool bits are annularly welded to the periphery of the base body, a plurality of diamonds are distributed on the tool bits through a net plate adsorption evenly-distributed technology, the tool bits are formed by sintering matrix powder, and the matrix powder comprises, by weight, 30%-40% of copper powder, 20%-30% of copper-tin diffusion powder, 10%-20% of carbonyl iron powder and 5%-10% of nickel powder. And 10%-15% of tin powder. According to the saw blade preparation process, a screen adsorption uniform distribution process and saw blade uniform distribution design are adopted, it is guaranteed that when the first diamond is consumed by 1 / 5-2 / 3, the second diamond can be exposed, it is guaranteed that edges are exposed when the diamonds are consumed to any height, and the cutting continuity of the diamonds is improved. The diamond of 60-100 meshes is used in the saw blade, a finer cutting face can be formed in the cutting process, and the saw blade is suitable for machining tasks with the high requirement for cutting precision. The 60-100-mesh diamond particles are suitable for cutting hard and brittle materials, and edge breakage and cracks of the materials can be reduced in the cutting process.

The present invention relates to the technical field of inorganic materials, and particularly to a method for clean smelting of beryllium oxide and beryllium oxide. The smelting method includes using iron powder to remove trivalent iron in the acid leaching solution of beryllium ore; using a non-saponified extraction system without sodium ions and ammonium cations, and the non-saponified extraction system exchanges hydrogen ions with itself when extracting beryllium ions. The present invention solves the problems existing in beryllium smelting preparation in the prior art, such as low beryllium recovery rate, easy interference by associated elements, large pollution, and difficult waste liquid treatment. An alkaline earth metal compound is used as a raffinate impurity removal reagent and a non-saponified extraction system, and the raffinate after impurity removal is recycled for beryllium ore leaching, improving the beryllium recovery rate and reducing the environmental pollution caused by waste liquid discharge.

The invention discloses a high-strength steel welding rod for 1000 MPa water and electricity and a preparation method and application of the high-strength steel welding rod. The invention belongs to the technical field of welding materials. The technical problems that the low-temperature impact toughness of an existing welding material for 1000 MPa-grade high-strength steel needs to be improved, and the welding cold crack sensitive index is too large are solved. The welding rod is composed of a core wire and a coating wrapping the surface of the core wire. Powder of the coating is formed by mixing marble, fluorite, rutile, silica powder, electrolytic manganese, ferrosilicon, graphite, ferromolybdenum, chromium metal, iron powder, nickel powder, sodium carbonate and sodium alginate. The welding rod has the advantages of good all-position welding process performance, stable electric arc, small flying speed, uniform coating melting, beautiful weld joint forming and good operability of welders. And weld metal has good mechanical properties. And the method is used for welding the high-strength steel for the 1000MPa-grade water

The invention discloses a preparation method of FeCoNiMnAl series high-entropy alloy powder with wave absorbing performance, which comprises the following steps: (1) uniformly mixing iron powder, cobalt powder, nickel powder, manganese powder and aluminum powder to obtain alloy raw material powder; (2) adding the alloy raw material powder, absolute ethyl alcohol and grinding balls into a ball milling tank, and carrying out high and low rotating speed alternate ball milling under the protection of inert gas; (3) after ball milling is finished, the alloy raw material powder obtained after ball milling is subjected to vacuum drying, grinding and smashing, and an intermediate product A is obtained; (4) adding a sodium hydroxide solution into the intermediate product A, and performing corrosion modification by adopting a water bath heating method; after the water bath is finished, washing a solid product obtained by solid-liquid separation to be neutral to obtain an intermediate product B; and (5) carrying out vacuum drying on the intermediate product B, and grinding and crushing. The FeCoNiMnAl series high-entropy alloy powder prepared by the preparation method disclosed by the invention has relatively excellent wave absorbing performance under the condition that the thickness is relatively small.

A seamless flux-cored wire for 10CrNiCu steel for ships, applied to welding of continuous casting 907A steel for a main hull and composed of a low-carbon steel sheath and a flux core. The diameter of the wire is 1.0-1.4 mm; the filling rate of flux-cored powder is 14%-16%; measured as the mass percentage of the flux-cored wire, the flux core contains rutile, aluminum oxide, ferroboron, zircon sand, quartz, bismuth oxide, potassium titanate, sodium fluoride, electrolytic manganese, ferrotitanium, magnesium powder, manganese-silicon alloy, nickel powder, metal chromium, copper powder, and iron powder. The seamless flux-cored wire for 10CrNiCu steel for ships has the advantages of good welding performance, stable mechanical properties, good crack resistance, low diffusion hydrogen content, high moisture absorption resistance, excellent rust resistance, and the like. Also provided is a method for manufacturing the seamless flux-cored wire for 10CrNiCu steel for ships

The invention belongs to the field of iron high-valued treatment and tailing reduction, and relates to an iron high-valued treatment and tailing reduction recovery method for multi-source neodymium iron boron secondary resources. In order to solve the problems of iron tailing treatment and high-value utilization of iron elements in the secondary resource recovery process of the neodymium iron boron waste, the invention develops a new process of'oxidizing roasting, carbonylation method iron extraction and wet process rare earth recovery ', so that effective extraction of rare earth elements is realized, high-value recovery of iron is promoted, and the generation amount of tailings is reduced. According to the technology, 60%-86% of iron elements in the neodymium iron boron magnetic material waste can be prepared into pentacarbonyl iron with the high additional value, then pentacarbonyl iron can be pyrolyzed to prepare a carbonyl iron powder product, the amount of iron tailings obtained after rare earth leaching is 350-600 kg / t of raw materials, and the output of the iron tailings is only 40%-60% of iron tailings generated after rare earth magnetic materials are recycled through a conventional roasting-hydrochloric acid optimal solution method. The new process can provide powerful guarantee for efficient and high-value utilization of neodymium iron boron waste and tailing reduction.

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 a low-loss multiphase inductance material which comprises a magnet and a winding, coils adjacent to the winding are wound in the reverse direction, meanwhile, the magnet extends out to form electrodes, and the magnet comprises Fe-based nanocrystalline and iron powder. The invention has the effect of reducing the loss of the inductance material.

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 a waste ternary lithium ion battery black powder treatment method which comprises the following steps: in the presence of a reducing agent, carrying out acid leaching on waste ternary lithium ion battery black powder to be treated to obtain a leaching system; mixing the leaching system with iron powder, and reacting to obtain copper-removed ore pulp; and waste ternary lithium ion battery black powder is added into the copper removal ore pulp, the pH value of a reaction system is made to be 4-6, solid-liquid separation is carried out after reaction, and liquid with iron and aluminum removed and black powder filter residues are obtained. According to the treatment method, the technological process is short, production equipment can be simplified, the treatment cost is reduced, meanwhile, the recovery efficiency of valuable metal such as nickel, cobalt, manganese and lithium is effectively improved, the recycling value of black powder treatment is improved, and remarkable technical and economic advantages are achieved.

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 relates to the field of design and preparation of powder metallurgy friction materials, in particular to a copper-based powder metallurgy friction material and a preparation method thereof. Raw materials used in the method comprise, by mass, 45%-55% of copper powder, 8%-20% of iron powder, 6%-15% of ferrochromium, 16%-22% of graphite, 0.5%-4% of molybdenum disulfide, 0.5%-4% of tin sulfide and 0.5%-4% of nickel-coated tungsten disulfide, and the mass ratio of the tin sulfide to the nickel-coated tungsten disulfide is (1-2): (1-2). In the nickel-coated tungsten disulfide, the content of nickel is 5-40%; the sum of the total amount of molybdenum disulfide, nickel-coated tungsten disulfide and tin sulfide is less than or equal to 5%. The preparation method comprises the following steps: weighing raw material powder according to the designed components, mixing, pressing and sintering to obtain the product. The composition design has the characteristics of scientificity, simple and controllable process and the like, and the obtained product has excellent tribological performance and completely meets the friction braking requirement of high-speed heavy-load equipment of 400km / h and above.

The invention relates to the technical field of environmental chemistry, in particular to a double-vacancy Fe0. 96S (at) MoS2 nano composite material as well as a wet-type mechanochemical synthesis method and application thereof. The preparation method comprises the following steps: firstly carrying out co-ball milling by utilizing a wet mechanical chemical synthesis method to obtain a low-crystallinity Fe0. 96S (at) MoS2 precursor, and then carrying out further calcination treatment to accelerate the thermal reaction of the precursor, improve the crystallinity and remove redundant sulfur powder impurities, thereby obtaining the high-crystallinity Fe0. 96S (at) MoS2 nano composite material. Iron powder is introduced in the process of preparing MoS2 nanosheets from molybdenum powder and sulfur powder, the reaction activity of the molybdenum powder and the sulfur powder is improved and the formation energy of MoS2 is reduced by utilizing the characteristic of ball-milling heat release of the iron powder and the sulfur powder, the reaction barrier that MoS2 is difficult to prepare between Mo and S through a mechanical ball-milling process originally is broken, and the generation of the MoS2 nanosheets is promoted.

The invention discloses a high-entropy alloy system high-temperature brazing filler metal and a preparation method and application thereof, and relates to the technical field of welding materials.The preparation method comprises the following steps that iron powder, cobalt powder, nickel powder, copper powder and molybdenum powder are weighed and evenly mixed, and mixed metal powder is obtained; the mixed metal powder is put into a first ball milling tank, argon is introduced, ball milling is conducted for at least 15 h, and alloyed powder is obtained; the alloyed powder is put into a mold and sintered in the hydrogen atmosphere at the temperature of 1000-1200 DEG C, and a sintered blank is obtained; the sintered briquette is crushed into particles, the particles are put into a second ball milling tank, ball milling is conducted for at least 20 h in the argon atmosphere, and high-entropy alloy powder is obtained; and weighing the high-entropy alloy powder, borax and polyvinyl alcohol, and uniformly mixing to obtain the high-entropy alloy system high-temperature brazing filler metal. The prepared high-entropy alloy system high-temperature brazing filler metal has the advantages of being good in component uniformity, high in performance stability and excellent in wettability and filling performance, and the welding quality of a brazed joint can be effectively guaranteed.

The invention relates to the technical field of cement-based material preparation, and particularly discloses a preparation method of an anti-carbonization all-solid waste slag-sulphoaluminate cementing material, which comprises the following steps: (1) putting a wet material formed by lead-zinc tailing powder and water into a reaction container, sealing, and heating; and mixing the obtained product with iron powder and / or iron oxide powder and water, stirring, separating out a solid product, and heating and drying in an air atmosphere to obtain the anti-carbonization tailing powder. And (2) mixing the anti-carbonization tailing powder with sulphoaluminate cement powder, and carrying out mechanical grinding treatment to obtain the modified sulphoaluminate cement. And (3) uniformly mixing blast furnace slag powder, the modified sulphoaluminate cement, fly ash, waste gypsum powder, an alkali activator, gypsum and a water reducing agent serving as raw materials to obtain the cementing material. According to the invention, the resource utilization of industrial solid waste is realized, the carbonization resistance of the cementing material is effectively improved, and the service durability of the cementing material is improved.