111 results about "Mo element" patented technology

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.

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 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 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%.

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 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 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.

The invention relates to the field of metal materials and manufacturing thereof, in particular to a seamless steel tube for a high-strength and high-toughness petroleum casing and a manufacturing method thereof.The seamless steel tube comprises, by weight, 0.20%-0.30% of C, 0.25%-0.30% of Si, 1.60%-2.40% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.002% of S, 0.020%-0.060% of Al, 0.06%-0.15% of Nb, 0.020%-0.040% of Ti, 0.04%-0.10% of V, 0.0020%-0.0040% of B, smaller than or equal to 0.0060% of N, 0.001%-0.005% of Ca, 0.20%-0.60% of Cr and the balance Fe and inevitable impurities, the Ti / N ratio is 2-8, the yield strength of the seamless the yield ratio is 0.85-0.92, the microscopic structure is fine tempered sorbite, the longitudinal impact energy of a Charpy V-shaped notch at the temperature of 0 DEG C is larger than or equal to 90 J, and the transverse impact energy of the Charpy V-shaped notch at the temperature of 0 DEG C is larger than or equal to 70 J. The process of high Nb microalloying, precise controlled rolling and controlled cooling and stepped tempering is adopted, Nb serves as the core, the synergistic effect of Ti, V and B elements is optimized, the strict performance requirement of the seamless pipe is met while no Mo element is added, and unified production of the 110-150 ksi-grade high-strength and high-toughness seamless steel pipe is achieved.

The invention discloses a high-strength wind power main shaft bearing and a processing method thereof, and the method comprises the following steps: S1, raw material preparation: a, blank selection: selecting high-strength alloy structural steel containing Cr, Ni and Mo elements as a bearing blank, wherein the content of the Cr element is 1.5%-2.0%, the content of the Ni element is 0.8%-1.2%, and the content of the Mo element is 0.2%-0.5%; high-strength alloy structural steel containing Cr, Ni and Mo is selected as a blank, the Cr element is used for improving abrasion resistance and hardenability, the Ni element is used for enhancing toughness and fatigue resistance, the Mo element is used for improving high-temperature strength and tempering-resistant stability, the performance bottleneck of a traditional material is broken through from the raw material level, meanwhile, through homogenizing annealing in the blank pretreatment stage, the hardness of the blank is improved, and the hardness of the blank is improved. The structure segregation in the blank is effectively eliminated, the uniformity of material components and structures is guaranteed, a stable material foundation is laid for subsequent machining procedures, and local stress concentration and early failure caused by uneven materials are avoided.

The invention relates to the technical field of amorphous alloy, in particular to a Fe-based amorphous alloy strip and a preparation method and application thereof, and the Fe-based amorphous alloy strip comprises the following elements of, by atomic percent, 75%-85% of Fe, 0.5%-4% of Si, 5%-12% of B, 0.1%-4% of P, 0.1%-4% of C, 0.5%-6% of Mo and 0.5%-5% of Ni. The sum of the atomic percentage contents of Fe, Si, B, P, C, Mo and Ni is 100%. According to the invention, the molybdenum element and the nickel element are introduced, so that the Fe-based amorphous alloy strip has high saturation magnetization, and meanwhile, the wear resistance and the toughness are remarkably improved.

Embodiments of the present application provide a martensitic steel and a preparation method therefor, a structural member, and a terminal device. The martensitic steel provided in the embodiments of the present application comprises the Ni element, the Co element, the Mo element, the Nb element, the C element, the Fe element and other trace elements; on the basis of the total mass of the martensitic steel, the mass fraction of the Ni element is 14%-16%, the mass fraction of the Co element is 16%-18%, the mass fraction of the Mo element is 7%-10%, the mass fraction of the Nb element is 0.1%-0.6%, and the mass fraction of the C element is 0.003%-0.1%. On the basis of the element selection of the martensitic steel and the design of the content of each element, the martensitic steel can be prepared by means of a powder molding process such as metal injection molding, and the martensitic steel prepared by means of the described process can have high strength, good toughness, and a preset shape.

The present application belongs to the technical field of electrolytic copper foil manufacturing, and particularly relates to a HVLP copper foil with low surface roughness and a preparation method thereof. The preparation method comprises the following steps: electrolytic foil growth, vacuum annealing treatment, electrochemical grain boundary pinning treatment, surface treatment and drying and slitting. The vacuum annealing treatment is performed after the electrolytic foil growth and before the surface treatment, so as to eliminate the residual stress in the copper foil; the electrochemical grain boundary pinning treatment adopts a silicon tungstate or phosphomolybdate electrolyte, and introduces tungsten or molybdenum elements at the grain boundary of the copper foil to form a pinning layer; in the surface treatment, the roughening treatment adopts pulse current and adds grain nano-refining additives, the solidification treatment is performed in a solidification liquid containing a rare earth salt, and the silane coupling agent treatment adopts a complex treatment liquid of KH-560 and a long-chain alkyl silane coupling agent. The obtained HVLP copper foil has a roughness Rz of the rough surface of less than or equal to 0.8 microns, high initial peel strength, a peel strength retention rate of more than 80% after hygrothermal aging, and good long-term service stability.

The application discloses a kind of co-high-entropy carbide cermet materials and preparation method and application thereof, belong to the field of cermet material.The co-high-entropy carbide cermet material provided by the application is with (WVMoTaTi) C ceramic as matrix, directly adding its corresponding metal elements (W element, V element, Mo element, Ta element, Ti element) as binder phase by discharge plasma coupling high-frequency induction sintering.The preparation method is to mix all raw materials in proportion first, then ball mill, dry to obtain mixed powder, and discharge plasma coupling high-frequency induction sintering is used.The application provides a kind of co-high-entropy carbide cermet material with high-entropy carbide solid solution and high-entropy alloy coexisting, which has excellent comprehensive mechanical properties, high precision and high-speed cutting ability, and shows irreplaceable importance in tool material, precision machining and other fields.

The application provides a kind of straw returning to field with self-hardening broken blade steel and its preparation method, and belongs to the field of steel preparation.The broken blade steel chemical composition includes C, Si, Mn, Cr, Ni, Mo, Nb, Ti, V, B and Fe; wherein, the content of C is 0.30%~0.55%, the content of Si is 0.15%~0.25%, the content of Mn is 0.45%~0.75%, the content of Cr is 0.85%~2.0%, the content of Ni is 3.0%~4.5%, the content of Mo is 0.4%~1.2%, the content of Nb is 0.01%~0.060%, the content of Ti is 0.015%~0.03%, the content of V is 0.3%~0.9%, and the content of B is 0.002%~0.005% by mass fraction.By limiting the addition of C, Si and Mn to improve the tensile strength of steel, adding Ti and Nb elements for fine-grain strengthening and second phase particle precipitation strengthening, adding B and Cr elements to improve the hardenability of steel, adding Ni to improve the toughness of steel, adding Mo element to improve the ability of anti-tempering brittleness, and adding V element to ensure hardenability at local high temperature, the metallographic structure of the steel is obtained in the form of lath martensite, thereby improving the performance of the broken blade.

The invention provides a membrane wall. The membrane wall comprises a plurality of metal base tubes, a plurality of fins, a corrosion-resistant layer and an alloy layer, the metal base tubes are connected through the fins; the corrosion-resistant layer is formed on the outer surface of the metal base pipe and forms metallurgical bonding with the outer surface; the alloy layer is formed on the surface of the corrosion-resistant layer and is metallurgically bonded with the surface of the corrosion-resistant layer; in the alloy layer, the mass percent of iron is smaller than or equal to 10%, the mass percent of chromium is larger than or equal to 12%, the mass percent of molybdenum is larger than or equal to 5%, the mass percent of tungsten is larger than or equal to 4%, the total mass percent of nickel and cobalt is larger than or equal to 50%, and the Vickers hardness of the alloy layer ranges from 350 Hv to 650 Hv. The invention further provides a manufacturing method of the membrane wall and a circulating fluidized bed boiler. The membrane wall formed by the method can effectively resist corrosion and abrasion.

The invention discloses an AlCrSiWN / Mo nano-composite coating with high hardness and high wear resistance and a preparation process of the AlCrSiWN / Mo nano-composite coating, and belongs to the technical field of coatings. The nano-composite coating is formed by doping Mo element in an AlCrSiWN high-hardness coating by adopting an arc ion plating technology, and the thickness of the nano-composite coating is 3-4 microns. The preparation process of the coating comprises the steps that an AlCrN transition layer of a columnar crystal structure is prepared firstly, then an AlCrSiW target and a CrMo target are started at the same time, the AlCrSiWN / Mo nano-composite coating with the high hardness and the self-lubricating performance is obtained by regulating and controlling the evaporation current of the CrMo target to be 122-150 A and utilizing the synergistic effect of the self-lubricating characteristic of the Mo element and the high hardness characteristic of the AlCrSiWN coating, and the self-lubricating performance of the AlCrSiWN / Mo nano-composite coating is improved while the high hardness of the coating is kept. The toughness and the self-lubricating performance of the coating are improved, and the friction coefficient is reduced while crack propagation is inhibited.

According to the yttrium-containing heat-resistant steel, by adding the rare earth yttrium element, the grain boundary binding force can be improved, the grain boundary strength and plasticity can be improved, the microstructure of steel can be remarkably refined, growth of thermal fatigue cracks can be inhibited, and therefore the steel can obtain better thermal ductility. And in addition, a proper amount of Mn and N elements are added to replace the Ni element, a proper amount of Zr / Nb / V elements are added to replace part of Mo element, the cost is jointly reduced, meanwhile, composite precipitation of (Zr / Nb / V / Mo) C / N is achieved, grains are further refined, the strength is improved, and therefore the steel has more excellent high-temperature performance.

The invention provides a Fe-Mn-Al-Ni-based superelastic alloy and a preparation method thereof, and belongs to the technical field of iron-based superelastic alloys. The Co element is added, so that a gamma phase with high number density can be formed, after the gamma phase is heated to an alpha single-phase region, a sub-crystal structure with wide orientation distribution, high average orientation difference and number density is formed in alpha-phase crystal grains, abnormal growth of individual sub-crystals is caused, other sub-crystals in mother crystal grains are completely consumed by the sub-crystals which grow abnormally, and therefore the performance of the alloy is improved. A huge free energy gradient is formed between mother crystal grains and surrounding normal crystal grains with sub-crystals, so that a greater driving force is provided for the growth of abnormal crystal grains, and the growth process of the abnormal crystal grains is greatly shortened; by adding the Mo element, the width of the sub-grain low-density area can be increased, the time that the grain boundary crosses the sub-grain low-density area is prolonged, and therefore the number of abnormal grains is reduced, and the final size of the grains is increased.

Provided is a coated cutting tool having improved wear resistance and fracture resistance and a long tool life. The coated cutting tool include a substrate and a coating layer formed on the substrate, wherein the coating layer has an alternately laminated structure of a first layer and a second layer, the first layer contains a compound having a composition represented by (AlaMbTi1-a-b, wherein M represents at least one of a Mo element and a W element, and 0.75≤a≤0.90 and 0.00<b≤0.20 are satisfied, the second layer contains a compound having a composition represented by (AlcMdTi1-c-d)N, wherein M represents at least one of a Mo element and a W element, and 0.75≤c≤0.90 and 0.00≤d≤0.20 are satisfied, the compound contained in the second layer being different from the compound contained in the first layer, at least one of a and c is 0.80 or more and, and an average thickness of the alternately laminated structure is 0.5 μm or more and 5.0 μm or less.

The invention discloses an electrocatalytic composite material based on cobalt monatomic regulation and control of molybdenum carbide phase change as well as a preparation method and application of the electrocatalytic composite material, and relates to the technical field of electrocatalytic hydrogen production. The preparation method comprises the following steps: dispersing a cobalt source, a molybdenum source and a surfactant in water, and adjusting to acidity to obtain a reaction solution; placing a substrate in the reaction solution, and reacting at 150-250 DEG C for 4-8 hours to obtain a precursor; placing the precursor and a carbon source in an inert atmosphere, raising the temperature to 800-1000 DEG C at 3-7 DEG C / min, and keeping the temperature for 1-3 hours to obtain an electro-catalytic composite material; in the reaction solution, the molar ratio of the molybdenum element to the cobalt element is 1: (0.01-0.33); the molar ratio of the molybdenum element to the carbon source in the reaction solution is 1: (0.01-0.03). A hydrothermal synthesis and high-temperature carbonization method is adopted, a carbide phase structure is precisely regulated and controlled through cobalt monatomic, and optimization of an electronic structure and catalytic performance is achieved, so that application of electrolyzed water in a full pH range is achieved.

The invention discloses a rhenium-free nickel-based single-crystal high-temperature alloy and a preparation method thereof, and relates to the technical field of high-temperature alloys. According to the high-temperature alloy provided by the invention, by finely regulating and controlling the proportion of strengthening elements such as Al, Ti, Ta and W and synergistically exerting the auxiliary effects of elements such as Cr, Co, C and Hf, after an expensive rhenium (Re) element and a molybdenum (Mo) element which is easy to promote generation of a harmful phase are thoroughly abandoned, collaborative optimization of high strength, high structure stability, excellent oxidation resistance and good casting performance is successfully realized. The rhenium-free nickel-based single crystal superalloy provided by the invention has high performance, high stability, excellent oxidation resistance and hot corrosion resistance and good castability, and provides an ideal material solution for low-cost and high-reliability manufacturing of high-temperature parts of heavy duty gas turbines.

The present invention discloses a TiAlMoN / TiAlTaN composite coating for steel processing and a preparation method thereof, which belongs to the technical field of coatings for cutting tools. The above-mentioned composite coating includes a Ti bonding layer, a TiN transition layer and a TiAlMoN / TiAlTaN functional layer. The present invention is based on a multi-arc ion plating machine. By adding Mo elements to the TiAlN coating, a MoO3 lubricating phase is formed on the surface of the substrate. The oxide phase has a layered structure and has low shear force, which significantly changes the cutting force and the temperature and contact area during the cutting process, greatly improving the wear resistance of the substrate. At the same time, the addition of Ta elements can inhibit the formation of γ-TiO2 to α-TiO2, delay the formation of h-AlN, and significantly improve the high-temperature heat resistance of the tool. In summary, the composite coating of the present invention has the characteristics of high hardness, high wear resistance, high heat resistance, simple preparation process and low production cost.

This invention discloses a doped magnesium vanadate cathode material, its preparation method, and its application, belonging to the field of magnesium battery technology. The preparation of the doped magnesium vanadate cathode material includes: reacting a mixed solution of vanadium source solution, molybdenum source solution, and magnesium source solution to obtain a cathode material precursor; and calcining the cathode material precursor. This method can precisely target the doping of Mo element in magnesium vanadate. Single doping of Mo introduces strong Mo-O bonds, effectively stabilizing the structure and suppressing the spinel-to-rock salt phase transition. Furthermore, O2p-Mo4d orbital hybridization improves electronic conductivity and rate performance, effectively overcoming the difficulty of simultaneously achieving structural stability and ion-electron dynamics in spinel cathode materials for magnesium batteries. The obtained doped magnesium vanadate cathode material is a spinel system, and the magnesium metal battery further prepared from it is the first discovered spinel-based magnesium metal battery capable of cycling at room temperature.

The application relates to the field of electrochemistry, and discloses a quaternary electrocatalytic anode material and a preparation method and application thereof. The quaternary electrocatalytic anode material takes a nickel foam as a carrier, a molybdenum element, an iron element and another secondary group metal element are deposited on the surface layer of the nickel foam, and the surface layer is a composite oxide of iron, nickel, molybdenum and another secondary group metal. The obtained quaternary electrocatalytic anode material can significantly improve the performance of electrocatalytic water splitting and oxygen evolution and electrocatalytic methanol oxidation, and has great application potential in large-scale commercial electrolytic cells.

The invention provides a platinum-doped hydrogen production electrode which is of a three-dimensional coralline structure and comprises a conductive substrate, a MoS2 / Ni2S3 nanosheet and Pt deposited on MoS2, the MoS2 / Ni2S3 nanosheets grow on the conductive substrate in situ, the length of the MoS2 / Ni2S3 stacked nanosheets is 2-6 [mu] m, and the average diameter of the MoS2 / Ni2S3 stacked nanosheets is 0.5-2 [mu] m; in the MoS2 / Ni2S3 nanosheet, the content of the Ni element is 20 to 50 weight percent, and the content of the Mo element is 0 to 5 weight percent; the deposition amount of Pt is not more than 0.1 mg / cm < 2 >. The hydrogen production electrode is of a three-dimensional coralline multi-stage structure, the mass transfer efficiency and the active site density of the electrode are improved, the MoS2 / Ni2S3 nanosheet grows on the conductive substrate in situ, the binding force between the MoS2 / Ni2S3 nanosheet and the conductive substrate is high, the interface contact resistance between the MoS2 / Ni2S3 nanosheet and the conductive substrate is greatly reduced, and the stability of the electrode is improved.

The invention discloses a high-bending-performance hot-die-casting-free aluminum alloy and a preparation method thereof. The high-bending-performance hot-die-casting-free aluminum alloy comprises 6.2%-7.5% of Si, 0.35%-0.60% of Mn, 0.08%-0.15% of Fe, 0.08%-0.15% of Mg, 0.12%-0.20% of Cu, 0.10%-0.25% of Mo, 0.05%-0.15% of Cr, 0.01%-0.03% of Sr, 0.01%-0.05% of Ba and the balance Al and inevitable impurity elements, and the total amount of the inevitable impurity elements is smaller than or equal to 0.5%. The Sr element and the Ba element have a synergistic modification effect, so that the Si modification effect can be remarkably improved, a thick and large flaky eutectic Si phase is converted into a dispersed granular or short rod-shaped Si phase, and the impact toughness and the bending performance of the alloy are greatly improved; through the composite solution strengthening effect of the elements of Mg and Cu, the solid solubility of a single element in a matrix is remarkably reduced, the solution strengthening effect of a casting is more uniform, the strength, toughness and impact toughness of the alloy are improved, the Fe phase morphology can be remarkably improved through the synergistic effect of the elements of Mn, Cr and Mo, needle-shaped and large-block-shaped Fe phases are converted into small-size block-shaped Fe phases, and the toughness of the alloy is improved.