86 results about "Iron nitride" patented technology

The present invention discloses an ultra-thin flexible magnetic adsorption eyelash magnetic sheet and a preparation method thereof, which relates to the technical field of magnetic adsorption eyelashes. Each group of eyelash magnetic sheets is composed of upper and lower magnetic sheets. Opposite adsorption magnetic poles are arranged on the two magnetic sheets respectively, and the magnetism of the opposite adsorption magnetic poles shows a gradient distribution of strong at the edge and weak in the middle on the magnetic sheet. The raw materials of the magnetic sheet include samarium iron nitride magnetic powder and polypropylene. Samarium iron nitride is non-toxic and resistant to sweat corrosion, and polypropylene meets the cosmetic grade standard, improving the biological safety and solving the problem of unreliable materials for traditional magnetic adsorption eyelashes. The magnetic sheet is designed as an opposite adsorption magnetization structure, and the upper and lower magnetic sheets can achieve firm adsorption, overcoming the defect of easy falling off of traditional magnetic adsorption eyelashes. The thickness is only 0.14 - 0.24 mm, and it does not break after being folded more than 500 times, conforming to the curvature of the eye, being comfortable to wear, and avoiding the defect of heaviness of traditional magnetic adsorption eyelashes.

The invention provides a high-density mould pressing bonding samarium-iron-nitrogen magnet with an extremely low cavity volume ratio and a preparation method of the high-density mould pressing bonding samarium-iron-nitrogen magnet, and belongs to the technical field of magnets, and the high-density mould pressing bonding samarium-iron-nitrogen magnet is prepared from a binder, a lubricant and the balance of samarium-iron-nitrogen magnetic powder. The preparation method comprises the following steps: performing surface treatment on the samarium-iron-nitrogen magnetic powder; dissolving a binder with an organic solvent, and adding the treated magnetic powder and a lubricant to obtain clinker; preheating a pressing mold, and preheating the clinker to 20-120 DEG C; the pressing force ranges from 6 T / cm < 2 > to 50 T / cm < 2 >, the pressing and pressure maintaining time ranges from 0.3 second to 150 seconds, meanwhile, a mold cavity of the mold is vacuumized, air among powder particles is exhausted, and finish machining is carried out after a compact structural body is formed. Through vacuum grease overflow compression molding, effective filling of cavities in the magnet is achieved, redundant resin overflows out of contact points among magnetic powder particles, the cavity rate of the magnet is remarkably reduced, the density of the samarium-iron-nitrogen magnet under the same pressure condition is remarkably improved, the crushing degree of the magnetic powder particles is reduced, and finally the magnetic performance of the magnet is remarkably improved.

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 discloses a magnetic rubber composition, a preparation method thereof and a sealing strip, and belongs to the field of rubber materials. The composition takes ethylene propylene diene monomer as a matrix, and comprises 100-600 parts of modified samarium iron nitrogen, 15 parts of a silane coupling agent Si69, 0.7-1 part of a vulcanizing agent and 5-15 parts of a foaming agent, and 1-10 parts of epoxy grafted modified beta-CD can also be added. The modified samarium-iron-nitrogen is loaded and grafted, and then the sealing strip is prepared through the working procedures of mixing, vulcanizing, magnetizing and the like. According to the sealing strip, carbon black is replaced with the magnetic powder, the VOC release amount and the odor level are reduced, the mechanical property is improved, magnetic attraction force is given, and the problem of rebound deterioration of a traditional sealing strip is solved through surface modification of the magnetic powder.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

The present invention relates to the technical field of nanopowder preparation, and discloses a method for preparing a nitrogen-doped biochar-loaded iron nitride composite material. The process is as follows: (1) potassium ferrate, urea, and waste tea powder are ground and mixed in proportion to obtain a first mixture; (2) the first mixture is reacted in a temperature range of 50-70°C to obtain a second mixture; (3) the second mixture is reacted in a temperature range of 600-800°C for 1-3 hours, and then cooled to room temperature to obtain a third mixture; (4) the third mixture is washed and dried to obtain a nitrogen-doped biochar-loaded iron nitride composite material. Compared with the existing preparation process, the beneficial effect of the present invention is that the operation steps only include grinding, stirring, heating, etc., the operation is simpler, the overall process only involves one pyrolysis, the energy consumption is lower, and the toxic gas ammonia is not used, and the operation is safer. The material can degrade trichloroethylene without an anaerobic environment and can be used for the remediation of organochlorine-contaminated groundwater environment.

The invention discloses a preparation method of a high-hydrogen-resistance pure iron nitriding composite diaphragm, which comprises the following steps: putting a matrix into a controllable atmosphere well type nitriding furnace, raising the temperature in the controllable atmosphere well type nitriding furnace to 460-500 DEG C at the temperature raising rate of 5-15 DEG C / min, and carrying out heat preservation for 2-6 hours to nitride the matrix; the base body is placed in a uniform temperature area of a tubular vacuum heat treatment furnace, the tubular vacuum heat treatment furnace is vacuumized, the temperature in the tubular vacuum heat treatment furnace is increased to 480-520 DEG C at the speed of 5-15 DEG C / mi, and heat preservation is conducted for 0.5-2 hours; taking out the matrix after the temperature in the tubular vacuum heat treatment furnace is reduced to room temperature; the hydrogen resistance of the prepared composite diaphragm can reach 13 times that of a pure iron matrix, the performance improvement amplitude is far higher than 3 times that of single gas nitriding treatment, and the composite diaphragm has the characteristics of good mechanical stability and strong deformation resistance.

The invention discloses high-coercivity samarium-iron-nitrogen magnetic powder and a preparation method thereof. The high-coercivity samarium-iron-nitrogen magnetic powder has anisotropy, and the particle size of the magnetic powder is micron-sized. The preparation method of the high-coercivity samarium-iron-nitrogen magnetic powder comprises the following steps: preparing an organic combined grinding agent containing a solvent, a surfactant and a coupling agent in proportion, and mixing the organic combined grinding agent with samarium-iron-nitrogen raw material powder to obtain a mixed material; grinding the mixed material to obtain ground slurry; and carrying out ultrasonic dispersion on the grinding slurry, and carrying out particle screening and drying to obtain the high-coercivity samarium-iron-nitrogen magnetic powder. The obtained micron magnetic powder has the obviously improved coercive force level, and the coercive force level can be equivalent to the coercive force level of submicron samarium-iron-nitrogen magnetic powder; requirements on preparation equipment are low, and the process is simple.

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

The invention provides a Yolk-shell type carbon composite iron nitride negative electrode material as well as a preparation method and application thereof. The Yolk-shell type carbon composite iron nitride negative electrode material comprises a shell, a cavity surrounded by the shell and an inner core arranged in the cavity, and the particle size of the Yolk-shell type carbon composite iron nitride negative electrode material is 180-400 nm; the shell is a carbon shell, and the thickness of the carbon shell is 10nm-30nm; the inner core is cubic iron nitride, and the particle size of the cubic iron nitride is 60-180 nm. The Yolk-shell type carbon composite iron nitride negative electrode material provided by the invention has a larger specific surface area, so that the contact between an electrolyte and an electrode is improved, the diffusion path of Na < + > transmission is reduced, and finally, the obtained sodium ion battery shows higher cycling stability.

To provide a steel part with excellent surface fatigue strength and a method for manufacturing the same. [Solution] The device comprises a steel core, a compound layer containing iron nitride, and a nitrogen diffusion layer between the steel core and the compound layer, wherein the steel core has the following composition by mass%, C: 0.05~0.30%, Si: 0.05~2.00%, Mn: 1.50~3.00%, P: 0.030% or less, S: 0.100% or less, Cr: 0.05~2.00%, V: 0.02~1.30%, Al: 0.100% or less, and N: 0.0250% or less. A steel part and a method for manufacturing the same, having a chemical composition containing the following, with the remainder being Fe and impurities, a compound layer thickness of more than 3 to 30 μm, the compound layer containing more than 50% γ' phase by area ratio, with the remainder being ε phase, containing 5 to 40% γ phase by area ratio in the region up to 10 μm from the surface of the nitrogen diffusion layer, and having a Vickers hardness of 580 HV or more at a depth of 0.05 mm from the surface of the nitrogen diffusion layer.

The invention relates to the technical field of catalyst preparation, and provides an iron-based catalyst, a preparation method and application thereof, and a method for preparing olefin from synthesis gas. The iron-based catalyst comprises 30-60 parts by mass of a carrier and 40-70 parts by mass of an active component, the active component comprises a composition of which the chemical formula is Fe100AaKbOx (Fe4N) c according to an atomic ratio; wherein A comprises at least one of Mo, W and Cr, the value range of a is 5-30, the value range of b is 1-10, the value range of c is 10-25, and x is the total number of oxygen atoms required by valence of each element in the catalyst. The iron-based catalyst provided by the invention simultaneously contains an iron oxide and an iron nitride, can be used for Fischer-Tropsch synthesis, and is beneficial to improvement of olefin selectivity; the CO conversion rate and the olefin selectivity can be further improved by limiting the ratio of iron oxide to iron nitride on the surface of the catalyst; and the method is suitable for a fluidized bed reactor, and can effectively solve the problem of difficulty in heat removal in high-temperature Fischer-Tropsch synthesis.

A permanent magnet may include a Fe16N2 phase constitution. In some examples, the permanent magnet may be formed by a technique that includes straining an iron wire or sheet comprising at least one iron crystal in a direction substantially parallel to a <001> crystal axis of the iron crystal; nitridizing the iron wire or sheet to form a nitridized iron wire or sheet; annealing the nitridized iron wire or sheet to form a Fe16N2 phase constitution in at least a portion of the nitridized iron wire or sheet; and pressing the nitridized iron wires and sheets to form bulk permanent magnet.

The invention belongs to the technical field of environmental functional materials and soil remediation, and particularly relates to a micron-sized zero-valent iron nitride catalyst as well as a preparation method and application thereof. The invention provides a nitrided micron zero-valent iron catalyst which is prepared by doping micron-sized iron powder with urea, the nitrogen content of the catalyst is 0.5 wt%-4.5 wt%, and the particle size of the micron-sized iron powder is 10-300 microns. The preparation method comprises the following steps: putting raw materials urea and micron-sized iron powder into a ball milling tank, adding grinding balls, and carrying out ball milling for 2-10 hours at the rotating speed of 450-550rpm in an air atmosphere; and drying the product after ball milling is finished, thereby obtaining the product. The catalyst is not only suitable for efficient deep treatment of high-concentration organic contaminated leacheate, but also can be directly used for chemical oxidation remediation of contaminated soil, and has remarkable engineering application value.

The invention belongs to the technical field of materials, and particularly relates to a high-performance functional composite elastomer material and a preparation method and application thereof. The iron nitride hollow microsphere wave-absorbing agent is prepared through a solvothermal reaction and a nitriding process. And the material density is reduced while the magnetic loss capability is improved. The appearance of the hollow microspheres is beneficial to multiple scattering and reflection of electromagnetic waves in the hollow microspheres, and the electromagnetic wave absorption capacity of the material is improved. When the thickness is 2 mm, the minimum reflection loss reaches-56.3 dB, and the effective absorption bandwidth reaches 6.9 GHz. Besides, iron nitride is combined with a self-repairing thermoplastic polyurethane matrix, so that the obtained high-performance functional composite elastomer material has excellent self-repairing capability, and the durability of a material system is remarkably improved. The preparation method is simple in process and low in cost, does not need complex synthesis equipment, and can be used for large-scale and large-batch production.

The invention discloses a composite lithium sulfide positive electrode material and a preparation method and application thereof, and belongs to the field of lithium-sulfur batteries. The invention uses a one-step calcination method of a carbon source and a metal salt, and reacts urea with a nickel salt and an iron salt to generate a nickel nitride and iron nitride complex, and glucose and urea generate nitrogen-doped multi-level porous carbon under the action of a sodium chloride template, thereby obtaining a nickel nitride / iron nitride complex and a nitrogen-doped multi-level porous carbon composite material as a precursor material. Lithium sulfide is mixed with N-methylpyrrolidone to prepare a lithium sulfide slurry. The prepared precursor material is immersed in the lithium sulfide slurry and dried to obtain a composite lithium sulfide positive electrode material. In the material, nickel nitride and iron nitride act as dual catalysts, and the synergistic effect accelerates the redox reaction of lithium sulfide / lithium polysulfide. In addition, the nitrogen-doped multi-level porous carbon structure can effectively carry lithium sulfide and lithium polysulfide, and alleviate volume expansion.

A permanent magnet may include a Fe16N2 phase constitution. In some examples, the permanent magnet may be formed by a technique that includes straining an iron wire or sheet comprising at least one iron crystal in a direction substantially parallel to a <001> crystal axis of the iron crystal; nitridizing the iron wire or sheet to form a nitridized iron wire or sheet; annealing the nitridized iron wire or sheet to form a Fe16N2 phase constitution in at least a portion of the nitridized iron wire or sheet; and pressing the nitridized iron wires and sheets to form bulk permanent magnet.

Improvements to metal-air batteries are disclosed including the provisioning of a reinforcing mesh to prevent electrolyte ingress to the anode, an inherently safe porous separator to slow leaks of aqueous electrolyte, nickel iron oxyhydroxide coatings to improve the oxygen evolution reaction cathode, and iron nitride or manganese oxide coatings to improve the oxygen reduction reaction cathode. Methods of making and using each of the improvements to form an improved metal-air battery are further disclosed.

According to an exemplary embodiment of the present invention, provided is an ammonia decomposition system capable of minimizing the generation of iron nitride as a by-product.

The invention relates to a method for forming an iron nitride coating on the surface of a substrate of iron or iron alloy, comprising the following steps: a) immersing the substrate of iron or iron alloy in an electrolytic bath comprising an ionic liquid in the presence of a counter electrode acting as a cathode, the ionic liquid comprises nitrogen cations and / or nitrogen anions, and the base material is used as an anode; b) subjecting said substrate to an electrochemical nitriding process comprising at least one of the following steps:-a constant current step in which an anode current representative of a predetermined reference current density is applied between the substrate and the counter electrode until a predetermined threshold voltage is reached, at which the anode current is applied between the substrate and the counter electrode until the predetermined threshold voltage is reached; generating an iron nitride coated portion having a predetermined thickness on the substrate; -a constant potential step in which a voltage having a value equal to a predetermined reference voltage is applied between the substrate and the counter electrode until a threshold anode current representing a predetermined threshold current density is reached, at which an iron nitride coating having a predetermined thickness is generated on the substrate.

A gear is made of a steel having a composition containing, by mass %, C: 0.31% to 0.35%, Si: 0.30% or less, Mn: 0.20% to 0.80%, P: 0.030% or less, S: 0.030% or less, Cu: 0.35% or less, Ni: 0.25% or less, Cr: 1.00% to 1.40%, Mo: 0.95% to 1.10%, and V: 0.25% to 0.30%, and satisfying the following Formulas (1) and (2), with a balance being Fe and unavoidable impurities, and the gear includes a soft-nitrided surface layer and a compound layer having a thickness of 5 μm or more and mainly containing an iron nitride.3.36×[Cr]+13.7×[Mo]+5.59×[V]>15 . . .  Formula (1)1.00×[C]−0.20×[Cr]+0.20×[Mo]+1.00×[V]−0.26>0.2 . . .  Formula (2)

A gear is made of a steel having a composition containing, by mass%, C: 0.31% to 0.35%, Si: 0.30% or less, Mn: 0.20% to 0.80%, P: 0.030% or less, S: 0.030% or less, Cu: 0.35% or less, Ni: 0.25% or less, Cr: 1.00% to 1.40%, Mo: 0.95% to 1.10%, and V: 0.25% to 0.30%, and satisfying the following Formulas (1) and (2), with a balance being Fe and unavoidable impurities, and the gear includes a soft-nitrided surface layer and a compound layer having a thickness of 5 µm or more and mainly containing an iron nitride. 3.36×Cr+13.7×Mo+5.59×V>15 1.00×C−0.20×Cr+0.20×Mo+1.00×V−0.26>0.2

The invention relates to an iron nitride permanent magnet and a technique for forming an iron nitride permanent magnet. Specifically, a bulk permanent magnet material may include from about 5 volume% to about 40 volume% Fe16N2 phase domains, a plurality of non-magnetic atoms or molecules forming domain wall pinning sites, and a remainder of a soft magnetic material wherein at least some of the soft magnetic material is magnetically coupled to the Fe16N2 phase domains by exchange spring coupling. In some examples, a bulk permanent magnet material may be formed by implanting N + ions into an iron workpiece using ion implantation to form an iron nitride workpiece, pre-annealing the iron nitride workpiece to attach the iron nitride workpiece to a substrate, and post-annealing the iron nitride workpiece to form Fe16N2 phase domains within the iron nitride workpiece.

The application discloses a composite heat insulation material with wave absorption performance, a multilayer phase interface structure containing the composite heat insulation material and a preparation method of the multilayer phase interface structure; the composite heat insulation material comprises: a heat insulation material and a wave absorber, wherein the heat insulation material is yttrium zirconium oxide YSZ powder; the wave absorber is samarium iron nitride SmFeN powder; the mass ratio of the heat insulation material to the wave absorber is 1:1; the multilayer phase interface structure containing the composite heat insulation material comprises: a YSZ / SmFeN uniform mixing structure, an interface structure parallel to incident electromagnetic waves, an interface structure vertical to the incident electromagnetic waves and a periodic arrangement interface structure containing both the interface vertical to the incident electromagnetic waves and the interface parallel to the incident electromagnetic waves.

The invention relates to the field of functional polymer materials, and discloses a samarium-iron-nitrogen magnetic EPDM (Ethylene-Propylene-Diene Monomer) foamed rubber composite material and a preparation method thereof.The preparation method comprises the following steps: firstly, uniformly dispersing samarium-iron-nitrogen magnetic powder in an EPDM (Ethylene-Propylene-Diene Monomer) matrix by adopting a mechanical blending method, and forming a foamed rubber matrix with an open-pore or closed-pore structure by adopting a two-stage vulcanization process; and finally, magnetizing by adopting a single-sided multi-stage magnetizing device to obtain the magnetic EPDM foamed rubber composite material. According to the preparation method provided by the invention, the samarium-iron-nitrogen magnetic EPDM foamed rubber composite material with excellent magnetic property, good mechanical property and relatively high foaming ratio can be obtained, the sealing property can be improved by utilizing the excellent magnetic property, and the samarium-iron-nitrogen magnetic EPDM foamed rubber composite material has a good application prospect in the field of magnetic sealing.

The present invention provides a method for preparing high-performance rapidly quenched samarium iron nitride magnetic powder, belonging to the technical field of magnetic materials, and comprising the following steps: A1. Weigh according to 2-3% excess of Sm, and smelt and rapidly solidify samarium powder and iron powder in a small-scale melting and rapid quenching device to obtain primary alloy powder; A2. After cooling the primary alloy powder, mix it evenly with metallic samarium powder, and smelt and rapidly solidify it again to obtain secondary alloy magnetic powder; A3. Perform HDDR treatment on the secondary alloy powder to obtain modified alloy powder; A4. Perform nitriding treatment on the modified alloy powder to obtain high-performance rapidly quenched samarium iron nitride magnetic powder with uniform structure. By addressing the loss of metallic samarium in the primary alloy powder stage and the alloy composition segregation caused by the difference in the density of the molten pool during melting, the present invention adds metallic samarium during the secondary melting to effectively suppress the non-uniform magnetic properties of the magnetic powder particles caused by alloy composition segregation, enabling the prepared magnetic material to have high coercivity, magnetic properties, and uniformity.

Provided in the present application are a method for manufacturing cookware and the cookware. The method for manufacturing cookware comprises: forming a thermal spraying layer on a cookware base body by using a ceramic material; and subjecting the surface layer of the thermal spraying layer to a remelting treatment, so as to manufacture cookware, wherein the remelting region serves as the surface layer of the cookware, and the ceramic material comprises at least one of ferroferric oxide, iron nitride, iron carbide and iron carbonitride. According to the method for manufacturing cookware provided in the embodiments of the present application, cookware having relatively good corrosion resistance can be manufactured.

Provided are soft magnetic iron alloy sheets having a saturation magnetic flux density comparable to that of Perminder alloys and iron losses equivalent to those of electromagnetic pure iron, while being less expensive than Perminder alloys, and a method for producing the same. The soft magnetic iron alloy sheet according to the present invention is characterized in that it has a chemical composition comprising 0 atomic % to 30 atomic % of Co, 0.1 atomic % to 11 atomic % of N, and 0 atomic % to 1.2 atomic % of vanadium, with the balance consisting of Fe and impurities. The sheet also includes a surface region having an average nitrogen concentration of 1 atomic % to 15 atomic % and an inner region having an average nitrogen concentration lower than the average nitrogen concentration of the surface region, the surface region having a thickness of 1% to 30% of the thickness of the soft magnetic iron alloy sheet from both main surfaces, and in which tetragonal iron nitride martensite is formed.

The invention provides a flexible magnetic sheet and a preparation method thereof and false eyelashes, and the flexible magnetic sheet comprises the following components in percentage by weight: 88-94 parts of samarium-iron-nitrogen magnetic powder, 6-10 parts of a binder, 0.7-1.5 parts of a coupling agent, 0.2-0.8 part of a lubricant and 0.2-0.8 part of a heat stabilizer; wherein the samarium iron nitrogen magnetic powder is granular, and the average particle size of the samarium iron nitrogen magnetic powder is 2-50 microns. The false eyelashes prepared by the method have better flexibility and stability and strong sweat corrosion resistance, and the flexible magnetic sheet has better flexibility, light weight, better suitability with the false eyelash body and longer service life, and has wide industrial application prospects.

The invention provides a preparation method of samarium-iron-nitrogen magnetic powder, which comprises the following steps: mixing iron, samarium oxide and rare earth hydride (as a reducing agent, preferably lanthanum hydride and / or cerium hydride), performing ball milling treatment, and performing briquetting treatment on the obtained mixed material to obtain a green body; performing vacuum heat treatment on the green body to obtain a coarse samarium ferromagnetic powder material; crushing the coarse samarium-iron magnetic powder material, placing the crushed coarse samarium-iron magnetic powder material in an ammonia atmosphere, and carrying out high-temperature nitriding treatment to obtain coarse samarium-iron-nitrogen magnetic powder; and transferring the crude samarium-iron-nitrogen magnetic powder into a washing solution for cleaning treatment so as to remove residual non-magnetic impurities in a solid phase, thereby obtaining the samarium-iron-nitrogen magnetic powder, the preparation method for preparing the samarium-iron-nitrogen magnetic powder has the advantages of being small in reducing agent dosage, low in heat treatment temperature, short in time and the like, and the preparation cost of the samarium-iron-nitrogen magnetic powder is effectively reduced.