196 results about "Mo element" patented technology

The invention discloses 700Mpa-grade hot-rolled wheel steel and a preparation method thereof, and belongs to the technical field of metallurgy. The steel for the wheel comprises the following chemical components in percentage by mass: less than or equal to 0.1% of C, 0.05-0.10% of Si, less than or equal to 1.65% of Mn, less than 0.015% of P, less than 0.005% of S, less than 0.060% of Nb, less than 0.020% of Ti, less than 0.03% of Cr, less than 0.045% of A1s, less than 0.005% of N, less than 0.003% of O and the balance of iron and inevitable impurities. The production method comprises the procedures of molten iron pretreatment, converter smelting, LF refining, RH refining, slab continuous casting, heating, rolling, laminar cooling and coiling. Under the condition that expensive Mo element is not added, through reasonable component design and a controlled rolling and controlled cooling process, the yield strength of the wheel steel is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 680 MPa, the ductility is larger than 18%, and the wheel steel has good welding performance and machining performance.

The invention discloses ultrafine heterostructure martensitic steel based on Mo segregation induction and a heat treatment process of the ultrafine heterostructure martensitic steel. The martensitic steel comprises the following chemical components in percentage by weight: 0.4-0.7% of C, 0.3-1.0% of Mn, 1.0-2.0% of Si, 0.2-1.5% of Cr, 0.01-3.5% of Ni, 0.2-0.8% of Mo, less than or equal to 0.03% of P, less than or equal to 0.03% of S and the balance of Fe. The method comprises the following steps: firstly, obtaining a pearlite type structure rich in Mo cementite through a normalizing or tempering process by utilizing the characteristic that Mo element is easily enriched in the cementite; then austenitizing treatment is conducted through a rapid heating technology by means of the characteristics that in the austenitizing process, the dissolving speed of molybdenum-rich cementite is low, and the diffusion speed of the Mo element is low, and a superfine austenite structure with the Mo element distributed unevenly is obtained, that is, a nanometer / submicron Mo-rich area exists in superfine austenite; and then quenching and tempering treatment are carried out, a tempered martensite structure with a superfine heterostructure is obtained, so that excellent strength and plasticity are obtained, the yield strength of the alloy can reach 2000-2500MPa, the tensile strength can reach 2100-2700MPa, and the ductility is 6-12%.

The embodiment of the invention relates to a method for recovering ferro-molybdenum through co-smelting of waste silicon-molybdenum rods and copper slag, and the method comprises the following steps: mixing the copper slag, the silicon-molybdenum rods, coke and calcium oxide to obtain a mixture; the mixture is heated, so that the copper slag and the coke are subjected to a smelting reduction reaction to obtain metal iron, molybdenum disilicide in the silicon molybdenum rod is subjected to a pyrolytic reaction under the action of the metal iron and calcium oxide, molten metal and molten slag are obtained, and the molten metal contains ferromolybdenum alloy components; according to the method, the molybdenum element in the waste silicon molybdenum rod can be fully enriched into iron, the recovery rate is high, the process is efficient and environmentally friendly, and waste liquid is not generated.

The invention discloses a high-entropy oxide composite negative electrode material as well as a preparation method and application thereof, and relates to the technical field of all-solid-state lithium battery negative electrode materials, and the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, wherein the metal elements are at least five of a chromium element, an iron element, a nickel element, a manganese element, a molybdenum element, a copper element and a cerium element; the molar ratio of the metal element to the oxygen element is 3: 4; the high-entropy oxide composite negative electrode material is of a spinel structure. According to the prepared high-entropy oxide composite negative electrode material, the problems that a traditional negative electrode material is unstable in structure, poor in interface contact and short in cycle life are solved, the electrochemical performance is improved, and an all-solid-state lithium battery prepared from the high-entropy oxide composite negative electrode material shows high reversible specific capacity and excellent cycle stability.

The invention belongs to the technical field of ferrous metallurgy and high-strength wear-resistant materials, and discloses large-thickness high-toughness NM550 wear-resistant steel and a preparation method thereof. Nb, Ti and V are cooperated according to the mass ratio of 1: 1: 2 to form a multi-element nano carbide (Nb, Ti, V) C main strengthening phase with the average particle size of 5-50 nm; in the controlled rolling and austenitizing stages, Cr and Mo elements form fine carbides, a main strengthening phase is induced to be separated out preferentially, and cluster aggregation is prevented; al initial deoxidation and Ce and Ca composite denaturation treatment are adopted to form spherical Ce-Ca-Al-O composite oxide inclusions, and the average particle size is smaller than or equal to 2 microns. By adopting clean smelting, uniform-temperature heating, temperature-controlled rolling, three-stage flow-regulating water cooling and two-stage tempering treatment, uniform regulation and control and multi-scale strengthening of the structure are realized. The yield strength is greater than or equal to 1400 MPa, the tensile strength is greater than or equal to 1850 MPa, the ductility is greater than or equal to 15%, the ballistic work at-20 DEG C is greater than or equal to 40 J, and the surface hardness is greater than

The invention discloses an iron-chromium-nickel-aluminum high-temperature alloy material and an application method thereof. The iron-chromium-nickel-aluminum high-temperature alloy material comprises a chromium element, an aluminum element, a nickel element, a manganese element, a tungsten element, a molybdenum element, a titanium element, a nitrogen element, a tantalum element, a zirconium element and the like with specific mass contents, wherein the contents of the chromium element, the aluminum element and the nickel element meet the requirement that the volume percent value of a NiAl precipitated phase at a high temperature is smaller than 3%. The iron-chromium-nickel-aluminum high-temperature alloy material has excellent anti-coking performance, anti-oxidation performance and high-temperature durability, and the operation efficiency and economic benefits of the ethylene radiation furnace can be obviously improved.

The invention relates to the technical field of steel and iron materials, and discloses tungsten-containing maraging ultrahigh-strength steel and a preparation method thereof. The tungsten maraging ultrahigh-strength steel comprises, by mass, 14.5%-16.0% of Co, 17.0%-18.0% of Ni, 6.0%-8.0% of Mo, 1.0%-1.5% of Ti, 0.5%-1.0% of W and the balance Fe and inevitable impurities, and the impurity elements are controlled according to the requirements that C is smaller than or equal to 0.008%, Si is smaller than or equal to 0.1%, Mn is smaller than or equal to 0.1%, P is smaller than or equal to 0.005%, S is smaller than or equal to 0.005%, N is smaller than or equal to 0.0015%, and O is smaller than or equal to 0.0015%. Based on calculation and research results of a first principle that element doping influences a precipitated phase in the maraging steel, 0.5-1.0% of W element is added into a component system of the maraging steel, meanwhile, the content of Mo element in the steel is increased, and under the condition that the grain size of the steel is larger than or equal to 8.0 level, the tensile strength Rm is larger than or equal to 2800MPa, and the elongation A is larger than or equal to 5%.

Provided herein are low resistance metallization stack structures for 3D-NAND applications and related methods of fabrication. In some embodiments, thin metal oxynitride nucleation layers are deposited on dielectric material followed by deposition of a pure metal conductor using process conditions that increase non-molybdenum component element content at the oxynitride-dielectric interface. Certain embodiments of the methods described below convert less than all of the metal oxynitride nucleation layer to a pure metal layer, further lowering the resistivity.

The invention relates to the technical field of research and development of low-temperature bolt steel, and discloses a low-temperature impact performance control process for low-temperature bolt steel. Comprising the steps that S1, in the steelmaking refining stage, purity and uniformity control is conducted, S2, casting blank homogenization treatment is conducted, stress relief and structure regulation are conducted, S3, a heat treatment core process is conducted, structure and toughness balance regulation is conducted, and S4, online detection and dynamic feedback are conducted, and performance stability is guaranteed. By accurately controlling the element proportion of carbon (C), silicon (Si), manganese (Mn), chromium (Cr) and molybdenum (Mo) in steel and combining with an optimized heat treatment process (such as 860 DEG C oil quenching and 640-650 DEG C high-temperature tempering, and the heat preservation time is prolonged to 120 minutes or more), the V-shaped notch impact energy of the material in the environment of-101 DEG C stably reaches 35 J or more, the impact energy of part of samples can reach 50 J or more, and the impact energy of the part of samples can reach 50 J or more. The problem that the low-temperature impact performance is insufficient after wire hardening and tempering is thoroughly solved, and it is ensured that the brittle failure resistance of the bolt is remarkably improved in the ultralow-temperature environment.

The invention discloses hard alloy welding powder for valve sealing surface surfacing and a preparation method of the hard alloy welding powder. The welding powder comprises 1.20%-1.40% of C element, 2.70%-3.5% of Si element, 3.00%-4.50% of Mn element, 24.00%-26.00% of Cr element, 2.00%-2.20% of Mo element, 3.50%-4.50% of Ni element, smaller than or equal to 0.20% of Co element, smaller than or equal to 0.02% of B element, smaller than or equal to 0.10% of N element and the balance Fe element. The preparation method comprises the following steps: weighing raw materials, mixing and smelting the raw materials to obtain alloy liquid; and the alloy liquid is subjected to gas atomization to prepare powder, and the hard alloy welding powder is obtained after screening. The Co element content is strictly limited, and meanwhile the hardness and other performance can meet the design requirement; the preparation method is simple and reliable in process.

A duplex precipitation-strengthened ultra-high strength and toughness stainless steel, wherein the duplex precipitates include NiAl nano-scale precipitates and M2C nano-scale precipitates. M in M2C is mainly Mo element, and also contains metal elements such as Cr and Ni. The NiAl nano-scale precipitates and M2C nano-scale precipitates are both promoted by Co to precipitate and are diffusely distributed in the lath martensite microstructure with a high dislocation density. The ultra-high strength and toughness means that the test results according to national standards GB / T 228.1-2018 and GB / T 21143-2014 are as follows: tensile strength ≥ 1900 MPa, elongation ≥ 10.0%, fracture toughness ≥ 70 MPa·m1 / 2. It is characterized in that it includes the following chemical element components and their wt% contents: C = 0.12 - 0.40%, Cr = 8.0 - 14.0, Ni = 7.0 - 17.0, Mo = 0.80 - 1.60, Al = 0.6 - 3.1, Co = 7.0 - 15.5, W = 0.35 - 0.75, Si ≤ 0.10%, Mn ≤ 0.10%, P ≤ 0.0050%, S ≤ 0.0015%, Fe = the balance.

The invention discloses an aluminum alloy recovery method, a recovered 6-series aluminum alloy and application. According to the method, the V and Mo elements and the optional Cr element are added into the recycled aluminum alloy and serve as modifiers for modifying the recycled aluminum alloy, meanwhile, the use amount of the V and Mo or the use amount of the V, the Mo and the Cr elements is controlled, the mass ratio of Fe / Mn and the mass ratio of Mg / Si in the recycled aluminum alloy are adjusted and controlled, a coarse primary iron-rich phase in the recycled material can be inhibited, and the recycling rate of the recycled aluminum alloy is increased. And the size of the iron-rich phase is refined, and the distribution uniformity is improved, so that the iron-rich phase is uniformly distributed in the regenerated aluminum alloy matrix, and the area fraction of the iron-rich phase and the width or diameter of the iron-rich phase are relatively small. And the V and Mo modifiers or the V, Mo and Cr modifiers all have a synergistic effect. The regenerated aluminum alloy has excellent mechanical properties after being subjected to subsequent heat treatment.

The invention relates to the technical field of preparation of high-entropy ceramics, and discloses a method for preparing compact high-entropy carbide ceramics, Ti3AlC2, TiC, VC, NbC, TaC and Mo2C are mixed and charged, then sintering is carried out, and the high-entropy carbide ceramics TiVNbTaMoCx are obtained after sintering is completed. In Ti3AlC2, TiC, VC, NbC, TaC and Mo2C, the molar ratio of Ti element to V element to Nb element to Ta element to Mo element is 1: 1: 1: 1: 1. According to the method, the density of the high-entropy carbide ceramic is improved by adopting a simple method, the process is simple and convenient, the production period is short, the raw materials do not need to be subjected to complex pretreatment, the preparation energy consumption and cost are remarkably reduced, and a new way is provided for large-scale preparation of the high-performance high-entropy ceramic material.

The present invention provides a Q690D steel plate with high and low temperature impact toughness and a production method thereof. The Q690D steel plate with high and low temperature impact toughness is designed with low-C steel, and Nb, V, and Ti elements are added to improve the strength of the steel plate; Cr and Mo elements improve hardenability, and P, S, N, and impurity elements are strictly controlled. The production method of the Q690D steel plate with high and low temperature impact toughness includes the following technological steps: hot metal pretreatment, converter steelmaking, post-furnace argon blowing, LF steel refining treatment, RH steel refining treatment, slab continuous casting, slab heating, descaling, rough rolling, finish rolling, preliminary straightening, ultra-fast cooling process, straightening, cooling bed, tempering, sampling, steel plate inspection, marking and warehousing. The Q690D steel plate produced by the present invention has high strength, excellent comprehensive properties such as plasticity, toughness, bending, and welding, and meets the use requirements of users.

The invention relates to an aluminum alloy material, an aluminum alloy structural part, a battery box body, a battery system, a power utilization device, a preparation method and application. The aluminum alloy material comprises the following composition elements: Si, Mn, Mo, Zr, Sr, Sc, B, a matrix element Al and inevitable impurity elements. In the aluminum alloy material, the content of the Mo element and the content of the Zr element are both low. The aluminum alloy material has good mechanical properties and excellent corrosion resistance, can be used as a main body material of an aluminum alloy structure in a battery box body, and can effectively prolong the service life of the battery box body.

The invention discloses an AlCrMoTiSiN high-entropy alloy coating with a self-lubricating property and a preparation process of the AlCrMoTiSiN high-entropy alloy coating, and belongs to the technical field of coatings. The AlCrMoTiSiN high-entropy alloy coating comprises the following chemical components in percentage by weight: 9.84 at.% to 33.52 at.% of Al, 19.59 at.% to 38.16 at.% of Cr, 3.75 at.% to 6.98 at.% of Mo, 2.06 at.% to 5.31 at.% of Ti, 1.01 at.% to 5.5 at.% of Si, and 36.52 at.% to 44.26 at.% of N. The invention further discloses a preparation method of the AlCrMoTiSiN high-entropy alloy coating. And depositing the high-entropy alloy coating on the substrate by adopting an arc ion plating technology. According to the preparation method, the high-entropy alloy coating with high hardness and a self-lubricating function is prepared through process design and optimization of the Mo element content.

The invention discloses a 980MPa-grade steel plate with a high bake hardening value, which contains Fe and inevitable impurities, and also contains the following chemical elements in percentage by mass: 0.15-0.25% of C; 0.5 to 1.7 percent of Si; mn: 1.50 to 2.50%; 0.03% to 0.80% of Al; 0 < B < = 0.001%; the 980 MPa grade steel plate does not contain Nb, V, Ti, Cr and Mo elements. The microstructure of the 980 MPa grade steel plate comprises at least one of retained austenite, martensite, tempered martensite and partition martensite, and the total area proportion of the retained austenite, the martensite, the tempered martensite and the partition martensite is not lower than 50%. The dislocation density of the martensite, the tempered martensite and the partition martensite is not lower than 0.7 * 10 < 15 > / m < 2 >.

The invention provides a secondary battery and an electric device. The secondary battery comprises a pole piece, the pole piece comprises a current collector, the current collector comprises an iron element and a molybdenum element, and based on the mass of the current collector, the mass content of the molybdenum element is 0.1%-20%, and the mass content of the iron element is 50%-99%.

The invention discloses 5.5 Ni steel with excellent ultralow-temperature impact toughness as well as a preparation method and application of the 5.5 Ni steel. The 5.5 Ni steel is prepared from chemical components in percentage by mass as follows: 0.04%-0.1% of C, 0.04%-0.15% of Si, 0.5%-1.5% of Mn, 5.0%-6.0% of Ni, 0.2%-0.3% of Mo and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: smelting; carrying out thermal mechanical treatment; and carrying out heat treatment by a quenching-two-phase region quenching-tempering process. According to the 5.5 Ni steel provided by the invention, only a certain mass fraction of Mo element is added, so that the problem of insufficient hardenability and strength caused by reduction of Ni element is solved, and the problem of low low-temperature toughness when the 5.5 Ni steel replaces 9Ni steel is solved through a QLT heat treatment process of thermal mechanical treatment and a quenching-two-phase region quenching-tempering process; the impact absorbing energy of the 5.5 Ni steel at the temperature of-196 DEG C reaches 250 J or above, the yield strength at the room temperature is larger than 580 MPa, and the requirements for strength and low-temperature toughness of the steel for the LNG storage tank are met.

The utility model discloses equipment for recovering molybdenum element in liquid phase, which relates to the technical field of heavy metal wastewater treatment, and comprises a reaction kettle and a reaction cavity, the reaction cavity is arranged in the reaction kettle, a liquid inlet pipe is arranged on the outer side of the reaction kettle and is communicated with the reaction cavity, a dripping pipe is arranged at the top of the reaction kettle in a penetrating manner, and the dripping pipe is communicated with the reaction cavity. Wherein one end of the dropwise adding pipe is located in the reaction kettle, the other end of the dropwise adding pipe protrudes out of the reaction kettle, and a feeding assembly is arranged in the dropwise adding pipe. And the stirring blades are driven by the stirring shaft to do uniform circular motion to stir the wastewater containing the molybdenum element to enable the wastewater to flow. Meanwhile, the stirring radius of the special-shaped blades is larger than that of the stirring blades, so that the stirring range can be enlarged, the flowability of the wastewater is higher, and the fed precipitation agent reacts with the molybdenum-containing wastewater more sufficiently. Moreover, the special-shaped blades can rotate along with the stirring shaft to change the distance to the stirring shaft under the action of centrifugal force, so that the stirring range is further flexibly adjusted, and the stirring shaft can be reset under the action of the spring when stopping rotating.

This utility model discloses a large-diameter pipe fitting for hydrogen transportation pipelines based on a composite plate, comprising: a tee structure, wherein the tee structure has an internal support structure in contact with each other; this utility model relates to the technical field of large-diameter pipe fittings. The tee structure and support structure are designed with an inner tube made of S31703 stainless steel and an outer tube made of Q345R alloy structural steel. The inner tube, with its high chromium, nickel, and molybdenum elements forming an anti-corrosion barrier, can directly contact the hydrogen medium. The outer tube, as a low-alloy high-strength steel, has both excellent plasticity and structural strength, which can meet the processing requirements of large-diameter pipe fittings such as rolling and stamping. Through the cooperation of the rotating shaft and the support rod, a cross structure is formed by rotating around it. The cooperation of the sliding groove, the sliding plate, and the support threaded rod, combined with the threaded transmission of the throttle handle, can precisely adjust the extension and retraction of the top block, so that it tightly presses against the inner wall of the inner tube, thus playing a supporting role.

The invention discloses a metal ceramic material containing rare metal elements and a preparation method and application thereof.The metal ceramic material comprises a hard phase and a binding phase, the hard phase is bound through the binding phase, and the hard phase comprises a first black core, a second white core and gray ring layers wrapping the first black core and the second white core respectively; the grey ring layer and the second white core are each provided with rare metal elements in a solid solution mode, and the rare metal elements comprise the molybdenum element and the rhenium element. According to the preparation method of the metal ceramic material containing the rare metal elements, the production cost is low, the rhenium element is added in the form of MoRe alloy powder, pre-ball milling and combined sintering are conducted on the rhenium element and binding phase powder, Mo and Re in a binding phase and a hard phase are evenly distributed, a uniform organization structure is obtained, the abrasion resistance and toughness of metal ceramic are improved, and the service life of the metal ceramic material is prolonged. And the metal ceramic material has better reliability and durability in application.

The present invention discloses a molybdenum-containing heat-conducting austenitic manganese steel and a preparation method thereof, which relates to the technical field of molybdenum-containing manganese steel and comprises the following processes: mixing pig iron and pure iron and melting them; adding ferrochrome, ferromanganese, ferromolybdenum, ferrotitanium, ferroniobium and chromium nitride, and continuing to melt to form molten steel; discharging the furnace and casting to obtain a blank; and performing heat treatment to obtain austenitic manganese steel. By adding element molybdenum to the manganese steel, carbides are formed with carbon in the manganese steel and are dispersed in the steel, which can optimize the morphology and distribution of carbides in the austenitic manganese steel, reduce defects in the manganese steel, and inhibit dislocation movement, which helps to improve the thermal conductivity of the manganese steel; at the same time, solute atoms around it are depleted, which can further improve its thermal conductivity.

The invention relates to a surface anti-corrosion treatment and coloring method for a stainless steel component. According to the surface anti-corrosion treatment and coloring method for the stainless steel component, pollutants such as impurities and oil stains on the surface of the stainless steel component can be removed through chemical oil removal and alkali corrosion treatment; through oxidation treatment, Cr and Mo elements can be introduced to the surface of the stainless steel component, and a surface passivation layer is formed, so that the corrosion resistance of the stainless steel component is enhanced; and through electrolytic treatment, the stainless steel component is subjected to hole sealing treatment, and the corrosion resistance of the stainless steel component is further enhanced. And through hardening treatment, the corrosion resistance of the stainless steel component is further enhanced. And moreover, the CrO3 concentration and the oxidation treatment duration are adjusted, so that the surface of the stainless steel component subjected to surface treatment can present different colors. According to the surface anti-corrosion treatment and coloring method for the stainless steel component, the anti-corrosion performance of the stainless steel component is greatly improved, the equipment requirement is low, therefore, the treatment cost is low, and the attractiveness of the stainless steel component can be improved.

The application relates to a feed for metal injection molding, a preparation method of the feed and a metal product, wherein the preparation method of the feed comprises the following steps: S1, obtaining the following components according to weight parts: 40-50 parts of Fe elements, 2-8 parts of Ni elements, 20-25 parts of Cr elements, 20-25 parts of Co elements, 2-8 parts of Mo elements, 2-8 parts of Cu elements, 0.1-3 parts of Si elements, 1-3 parts of Mn elements, mixing and then heating to melt the material, and then adopting a high-pressure water-gas combined atomization method to obtain mixed powder; S2, obtaining a forming agent; S3, preheating the mixed powder obtained in S1 under vacuum conditions, then adding the forming agent into the mixed powder for mixing, and then performing plasticizing extrusion granulation to prepare the feed. The feed can meet the size precision requirements of MIM injection, green compact degreasing sintering and related post-process machining, the existing MIM materials on the market cannot simultaneously meet the problem of high polishable hardness, and the obtained metal product has the comprehensive advantages of appearance and hardness.

The invention relates to the technical field of metal additive manufacturing, in particular to a titanium-based composite coating for laser additive remanufacturing and a preparation method and application thereof. The method comprises the following steps: adhering tungsten carbide and nano metal Mo powder by adopting an acoustic resonance technology; the composite coating structure is prepared in a laser directional energy deposition and cold spraying mode; and stress is eliminated through heat treatment. Composite powder with Mo adhered to the surface of tungsten carbide is added into TC4 titanium alloy, and then the titanium alloy composite coating is prepared through the laser directional energy deposition and cold spraying technology. Wherein the adhesion of Mo can effectively promote the transformation of beta phase on one hand, and on the other hand, Mo can be used as a barrier to firstly contact a matrix to reduce the generation of brittle phase and improve the strength and wear resistance of the coating. And through heat treatment, stress concentration of the coating is reduced, the diffusion effect of the Mo element is improved, surface lubrication and abrasion reduction are achieved, and the mechanical property of the titanium alloy composite coating is improved.

Ultrafine-grained W-Mo-Cu composite materials with Mo elements distributed at the W / Cu phase boundary belong to the fields of W-Cu composite materials and powder metallurgy. The ultrafine-grained W phase is uniformly distributed in the Cu matrix, and the added Mo element is dispersed at the W / Cu phase boundary. The Mo content is 2-10 at.%, and the mass percentage of Cu is 20%-40%. The average W phase size can be controlled in the range of approximately 100-400nm. A preparation technology that can control the content of the added components and distribute the added components at the W / Cu phase boundary has been developed. Through this preparation technology, a new ultrafine-grained W-Mo-Cu composite material with ultrafine W grain size and Mo elements distributed at the phase interface has been obtained. This composite material exhibits excellent comprehensive properties in terms of high-temperature stability, strength, plasticity and electrical conductivity.

The invention belongs to the technical field of steelmaking, and particularly relates to a molybdenum oxide composite pressed ball formula process which comprises the following components: 5-30% of lime powder, 5-20% of dolomite powder, 3-8% of anthracite powder, 3-6% of magnesium particles, 40-80% of molybdenum oxide powder, 3-10% of AD powder and 1-3% of binder. CaO in the lime, MgO in the dolomite and molybdenum oxide generate molybdate with a relatively high melting point through presintering in the rotary kiln, so that volatilization of the molybdenum oxide during direct alloying is effectively inhibited; in the pre-sintering process, C, Mg and Al can pre-reduce part of molybdenum oxide in advance; in the early stage of converter smelting, the molybdenum oxide composite pressed balls are added into a converter, C, Mg and Al in the molybdenum oxide composite pressed balls and C in molten iron can reduce molybdate and molybdenum oxide, and the generated molybdenum element enters molten steel to achieve the purpose of molten steel alloying. As the price of molybdenum oxide is far lower than that of ferromolybdenum, the economic benefit is remarkable.

The invention provides stainless steel with a stable medium-temperature thermal expansion coefficient, an interconnection plate and a preparation method, and belongs to the field of alloys. The stainless steel comprises the following chemical components: 21%-30% of Cr, 0.05%-0.19% of Al, 0.1%-2.5% of Mn, 0.05%-3% of Nb, 0.02%-0.14% of Si, 0.5%-2.5% of W, 2.1%-7% of Mo, and the balance of Clt. 0.008%, T.O < = 0.002%, N < = 0.001%, and Fe. Through matching and cooperation of alloy elements Al, Cr, Mn, V, Si and Mo, the medium-temperature expansion coefficient is adjusted to be (10-12) * 10 <-6 > / K, and the medium-temperature thermal expansion requirement of the solid oxide fuel cell is met. Different elements have different influences on lattice vibration at medium temperature, and the Mo element obviously reduces the lattice vibration, so that the thermal expansion coefficient of the alloy is effectively reduced, and the thermal expansion coefficient of the alloy at 600-900 DEG C is effectively controlled to be consistent with the thermal expansion coefficient of a solid electrolyte through matching and cooperation of the alloy elements.

The invention discloses a perovskite anode catalyst layer material and a preparation method thereof, and belongs to the technical field of ceramic fuel cells. The perovskite anode catalyst layer material is prepared by adopting a plasma-assisted ball milling method, the molecular formula of the perovskite anode catalyst layer material is Sr < 2-x > Fe < 1.5-y > Ru < y > Mo < 0.5 > O < 6-delta >, x is equal to 0.05-0.10, y is equal to 0.05-0.15, and delta is equal to 0.10-0.35. A-site defect and B-site doping are designed on the basis of Sr2Fe1. 5Mo0. 5O6-delta perovskite, and performance breakthrough of the direct ammonia proton ceramic fuel cell at medium and low temperatures is achieved through the synergistic effect. Under the synergistic effect of argon plasma and mechanical force, nano-scale crushing and atomic-scale uniform mixing of raw materials are achieved, a large number of defects and active sites are generated on the surface of powder, subsequent solid-phase reaction activation energy is remarkably reduced, volatilization loss of ruthenium and molybdenum elements at high temperature is inhibited, and stoichiometric accuracy and structural uniformity of a final product are guaranteed.