43results about How to "Increase volume fraction" patented technology

The invention discloses an MIM injection molding process of a neodymium-iron-boron magnet, which comprises the steps of raw material ratio adjustment, melt-spinning molding of a strip-shaped sheet, crushing treatment, mixing with a mixed solution of a coupling agent and ethanol, mixing and banburying with a binder, orientation injection molding, extraction degreasing, thermal degreasing, sintering, magnetizing and the like. Through the processes of optimization of raw material components, orientation injection molding, extraction degreasing, thermal degreasing and the like, near-net forming of a complex shape is achieved, meanwhile, the MIM neodymium-iron-boron magnet can achieve the excellent magnetic performance that the residual magnetization is larger than or equal to 1.04 T and the maximum magnetic energy product is larger than or equal to 29.7 MGOe, and the magnet yield and the production efficiency are greatly improved.

The vertical centrifugal discharging horizontal sand mill comprises a grinding rotor and a grinding cylinder, and a grinding block is arranged on the grinding rotor; an outlet of the grinding cylinder is formed in one side of the grinding cylinder and is communicated with a discharge hole of the horizontal sand mill; a separation pipeline is arranged between the outlet of the grinding cylinder and the discharge port of the horizontal sand mill, a first bulge is arranged on the inner wall of the separation pipeline, the first bulge is of a wavy structure with a plurality of continuous bulge parts, and the bulge parts closer to the discharge port of the horizontal sand mill are higher on the inner wall of the separation pipeline; a separation paddle is further arranged between the outlet of the separation pipeline and the discharge hole of the horizontal sand mill, the separation paddle comprises a paddle blade and a paddle hub used for mounting the paddle blade and driving the paddle blade to rotate, and the separation paddle endows the slurry with a vertically downward speed component through the paddle blade. According to the invention, ball leakage at the discharge port can be avoided by controlling the motion trail and speed of the material and the grinding medium, circulation of the grinding medium in the grinding cylinder is accelerated, and the grinding efficiency is improved.

The invention relates to a mixed transportation pipeline hydrate blockage risk grading method which comprises the following steps: determining the height of a sedimentary bed layer in a pipeline based on the hydrate generation deposition amount in the pipeline, and determining a hydrate blockage risk area and grade in the pipeline through an established hydrate blockage area judgment criterion. And finally, the hydrate blockage risk grading method in the mixed transportation pipeline is formed. According to the method, the risk of pipeline blockage can be comprehensively evaluated, the design optimization work of a pipeline transportation system is guided, and the method has important significance on hydrate flow safety guarantee.

The invention discloses a room-temperature-cured high-strength high-thermal-conductivity and high-electric-conductivity silver adhesive which is characterized by comprising the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 2-6 parts of carbon nanotubes, 200-450 parts of conductive particles, 1-5 parts of a silane coupling agent, 5-12 parts of a cross-linking agent and 0.5-5 parts of a catalyst. The invention further discloses a preparation method of the room-temperature-curing high-strength high-thermal-conductivity and high-electric-conductivity silver adhesive. The room-temperature-cured high-strength high-thermal-conductivity and high-electrical-conductivity silver adhesive has the advantages of short curing time, low volume resistivity, high bonding strength and good electrical conductivity. The product is tested after being placed in an outdoor environment for 12 months for a long time, the volume resistivity and the bonding strength of the conductive silver adhesive disclosed by the invention are hardly influenced, and the conductive silver adhesive shows excellent weather resistance; the product has high stability and can be used for a long time.

The invention discloses an asynchronous rolling process method of a high-strength and high-toughness Al-Cu-Mg-Ag alloy plate, which comprises the following steps: carrying out multi-pass asynchronous hot rolling on an Al-Cu-Mg-Ag alloy ingot to obtain a hot-rolled plate, carrying out annealing treatment on the hot-rolled plate to obtain an annealed part, and carrying out multi-pass asynchronous cold rolling on the annealed part to obtain a cold-rolled plate, and finally, the cold-rolled plate is sequentially subjected to solution treatment and aging treatment, and the high-strength and high-toughness Al-Cu-Mg-Ag alloy plate is obtained. According to the method, the initial cast ingot is directly subjected to asynchronous rolling forming, the morphology of a primary phase is remarkably improved, the content of Cu atoms in an aluminum solid solution is increased, the microstructure is regulated and controlled through plastic deformation and heat treatment process adjustment, and then the strength of the alloy plate is remarkably improved.

Disclosed herein is a hydrocarbon component comprising predominantly a C15 to C22 normal paraffin, a C15 to C22 single branched isoparaffin, and a C15 to C22 multi-branched isoparaffin. In the hydrocarbon component, the weight ratio of isoparaffins to n-paraffins is higher than that of hydrocarbon components in the prior art. Due to its improved properties, the hydrocarbon component according to the invention can be used for a wide range of applications, in particular in north grade diesel fuels, where it can be incorporated in higher proportions.

The invention relates to the technical field of aluminum alloy materials, in particular to an aluminum alloy material, an aluminum alloy conductor wire core and a preparation method and application of the aluminum alloy conductor wire core. The aluminum alloy material comprises, by mass, 0.3%-1.0% of iron (Fe), 0.03%-0.2% of magnesium (Mg), 0.1%-0.8% of manganese (Mn), 0.08%-0.3% of zirconium (Zr), 0.004%-0.03% of boron (B), 0.015%-0.65% of rare earth (RE), 0-0.12% of silicon (Si) and the balance aluminum (Al) and inevitable impurities, the single impurity is not larger than 0.03%, and the sum of the impurities is not larger than 0.1%. Wherein the rare earth (RE) is prepared from the following components in percentage by mass: 0.003 to 0.1 percent of lanthanum (La), 0.004 to 0.15 percent of cerium (Ce) and 0.008 to 0.4 percent of scandium (Sc). The prepared aluminum alloy material has the characteristics of high conductivity, high strength, heat resistance, corrosion resistance and good fracture and impact toughness, is very suitable for being used as a cable conductor, and is particularly applied to places with high requirements on high temperature, vibration, movement, corrosion and the like, such as power cables, electrical connecting wires, drag chain cables applied to metal smelting places and the like.

The invention discloses a rolling deformation method for improving the mechanical property of a CoCrFeNiMo0.35 high-entropy alloy, through high-temperature severe plastic deformation, the structure of the CoCrFeNiMo0.35 high-entropy alloy is refined, meanwhile, as-cast sample structure defects such as air holes can be eliminated, the alloy structure is densified, and along with the increase of rolling reduction, the mechanical property of the CoCrFeNiMo0.35 high-entropy alloy is improved, so that the mechanical property of the CoCrFeNiMo0.35 high-entropy alloy is improved. And further refining of crystal grains is effectively promoted. This is the first main factor causing improvement of the mechanical property of the alloy. Besides, in the hot rolling deformation process, alloy grains are stretched into a flat shape in the rolling direction, the volume fraction of a sigma phase is increased along with increase of rolling reduction, the sigma phase is a common hard phase in the high-entropy alloy, and therefore improvement of the alloy strength can be promoted, and the strength of the alloy is improved. The room-temperature tensile engineering stress-strain curve of the CoCrFeNiMo0.35 high-entropy alloy corresponding to different rolling reduction amounts is shown in the figure 7. It can be seen that when the rolling reduction is increased from 10% to 50%, the yield strength and the tensile strength of the alloy are both obviously improved.

The invention provides a method for ultrasonically optimizing the structure and performance of a Ni-Co-based high-temperature alloy. The method comprises the following steps: 1, smelting a Co block, a Ni block, a Cr block and an Al block twice and preserving heat to obtain an alloy melt; secondly, the temperature of a preheating casting mold reaches 900 DEG C or above; thirdly, the alloy melt is poured into a preheated casting mold, then ultrasonic vibration treatment with the frequency of 17-25 kHz is conducted on the alloy melt contained in the casting mold, the cooling speed is controlled, and an alloy ingot is obtained; and fourthly, the alloy ingot is subjected to heat treatment, and the structure and performance of the Ni-Co-based high-temperature alloy are further improved. According to the method, the Ni-Co-based alloy melt is subjected to wall vibration type treatment by adopting ultrasonic waves, a proper smelting-pouring system is formulated according to the thermophysical property of the alloy, and an experimental scheme of effectively applying ultrasonic waves in a segmented manner and controlling cooling is implemented for different phase change stages and solidification structures, so that the as-cast solidification structure and the mechanical property of the Ni-Co-based alloy are regulated and controlled.

The invention discloses a high-entropy alloy hydrogen permeation film and a preparation method and application thereof.The high-entropy alloy hydrogen permeation film comprises a high-entropy alloy layer and a surface Pd layer, the chemical general formula of the high-entropy alloy layer is Nb100-(a + b + c + d) HfaCobMoc-Md, M is selected from at least one of Ni, W and Cu, a is larger than 5 and smaller than or equal to 35, b is larger than 5 and smaller than or equal to 35, c is larger than 5 and smaller than or equal to 30, and d is larger than 5 and smaller than or equal to 35. According to the high-entropy alloy layer, generation of intermetallic compounds can be avoided through mutual dissolution of multiple components of Nb, Hf, Co and Mo elements and Ni, W and Cu elements, formation of a primary phase in a high-entropy alloy hydrogen permeation film is promoted, and the hydrogen permeation performance of the hydrogen permeation film is effectively improved. And by adding Ni, W and Cu elements, formation of a eutectic phase in the high-entropy alloy hydrogen permeation film is promoted, the volume fraction of the eutectic phase is increased, and the hydrogen embrittlement resistance of the high-entropy alloy hydrogen permeation film is effectively improved.

The invention provides an aluminum-copper-cerium heat-resistant aluminum alloy and a preparation method thereof. The aluminum-copper-cerium heat-resistant aluminum alloy comprises the following components in percentage by weight: 7%-9.5% of Cu, 1.3%-2.3% of Ce, 0.1%-0.5% of Mn, 0.1%-0.4% of Sc, 0.1%-0.4% of Zr and the balance of Al and inevitable impurities. The structure morphology of the heat-resistant aluminum alloy is an isometric crystal, coarse precipitation Al3 (Sc, Zr) exists in the isometric crystal, and the heat-resistant aluminum alloy is an alpha-Al nucleating agent; a large number of high-thermal-stability L12Al3 (Sc, Zr) with the size smaller than or equal to 10 nm and a large number of Al2Cu nanoscale dispersed precipitated phases with the thickness smaller than or equal to 10 nm are separated out in crystal grains, and granular and lamellar Al24MnCu8Ce3, Al16Cu4Mn2Ce and Al8CeCu4 micron-scale heat-resistant intermetallic compound networks are continuously distributed along the crystal boundary. The heat-resistant aluminum alloy is excellent in high-temperature performance and high in high-temperature yield strength and tensile strength and is superior to a traditional ZL206 alloy (T6) and a traditional ZL207 alloy (T6), and the long-term service capacity of the cast heat-resistant aluminum alloy at the high temperature is remarkably improved.

This utility model discloses a system for combined denitrification under full-load conditions in a circulating fluidized bed boiler, comprising a wide-temperature-range SNCR denitrification module and a flue gas circulation module. The injectors in the wide-temperature-range SNCR denitrification module are arranged in the inlet flue of the high-temperature separator, the inlet flue of the high-temperature superheater, or the boiler furnace. The flue gas circulation module includes a flue gas circulation header and flue gas circulation branch pipes arranged along the flue gas flow direction. The flue gas circulation header connects to the flue gas circulation branch pipes, which are connected to the air preheater via a primary air fan. The inlet of the flue gas circulation header connects to the outlet of the induced draft fan. This utility model extends the lower limit of the conventional 800~1050℃ temperature window to 650℃. It uses ethanol as a low-temperature additive, resulting in relatively low denitrification costs and convenient ethanol addition and removal. Compared with existing SCR denitrification technology, the system is simpler and more economical. It does not require boiler modification, nor does it require additional denitrification reactors and catalysts, making the system relatively simple and facilitating switching between low-temperature denitrification mode and conventional denitrification mode.

The invention relates to the technical field of preparation of lead-free metal halide scintillator crystal powder, and particularly discloses chlorine zirconium cesium crystal powder for a composite scintillator and a confinement growth method of the chlorine zirconium cesium crystal powder. The cesium zirconium chloride crystal powder is cesium zirconium chloride-gas phase oxide composite powder formed on the micro-nano scale by means of in-situ crystallization, and the cesium zirconium chloride crystal powder is composed of 50-95.3 wt% of cesium zirconium chloride and 4.7-50 wt% of gas phase oxide. The preparation method comprises the following steps: preparing zirconium chloride-gas phase oxide powder, preparing a cesium chloride solution, mixing zirconium chloride-gas phase oxide slurry, and growing chlorine zirconium cesium crystal powder in an in-situ crystallization confinement range. The cesium zirconium chloride crystal powder prepared by the method has the advantages of adjustable particle size, stable suspension and efficient scintillation luminescence performance, solves the problem of crystal powder-polymer phase separation in a composite scintillator, and can be used for large-scale preparation of the composite scintillator in the field of radiation detection.

The invention discloses a multifunctional electrical detection chip for detecting cell parameters, comprising various levels of flow channels connected in sequence through connecting flow channels; a pair of first-level conformable stereoscopic electrodes are symmetrically arranged on both sides of the end of the input flow channel close to the connecting flow channel; a pair of second-level conformable stereoscopic electrodes are symmetrically arranged on both sides of the end of the first-level contraction flow channel close to the connecting flow channel; a third-level conformable stereoscopic electrode is arranged on one side of the end of the first-level contraction flow channel close to the connecting flow channel; a fourth-level conformable stereoscopic electrode is arranged on one side of the middle of the second-level contraction flow channel; a fifth-level conformable stereoscopic electrode is arranged on one side of the end of the third-level contraction flow channel close to the connecting flow channel; a sixth-level conformable stereoscopic electrode pair is symmetrically arranged on both sides of the end of the third-level contraction flow channel close to the connecting flow channel; a seventh-level conformable stereoscopic electrode pair is symmetrically arranged on both sides of the end of the output flow channel close to the connecting flow channel; the ends of the conformable stereoscopic electrodes of each level are conformal to the wall of the corresponding flow channel, and the ends of the conformable stereoscopic electrodes of each level serve as the wall of the corresponding flow channel.

The invention discloses a high-strength anti-steam oxidation coating material and a coating, a preparation method and application thereof, and belongs to the technical field of corrosion prevention of inner walls of through-flow components of thermal power generating units. The high-strength steam oxidation-resistant coating material disclosed by the invention is composed of the solid-phase component and the liquid-phase component, and all the components play a synergistic role, so that the steam oxidation resistance of a coating is improved, and meanwhile, the mechanical property of the coating is enhanced, so that the coating is prevented from cracking in the service process, and the service life of the coating is prolonged. The problem that an existing coating cracks in a high-temperature environment is solved.

The invention relates to the technical field of hard alloy material preparation, in particular to a high-wear-resistance hard alloy composite material and a preparation method thereof. The problems that the hard alloy composite material is poor in comprehensive mechanical property and poor in wear resistance are solved. Tungsten carbide and titanium carbide are uniformly mixed, and a hard phase is obtained through heat treatment; nickel sulfate, sodium molybdate and nanoparticles are dissolved and subjected to electrochemical treatment, a binding phase is obtained, the hard phase and the binding phase are subjected to ball milling, pressing, sintering, annealing treatment, grinding and cleaning, and the hard alloy composite material is obtained; the hardness of the alloy is improved by controlling the heat treatment temperature and time; the current density and the solution temperature are controlled to adjust the dosage of the molybdenum element to improve the toughness of the alloy; the sintering temperature and time are adjusted, and the hardness and transverse breaking strength of the alloy are improved; the annealing time and temperature are controlled, the grain size of the hard alloy is adjusted, and the comprehensive mechanical property of the alloy is improved; and the wear resistance of the alloy is improved by controlling the variety and dosage of the nanoparticles.

The present application relates to an Al-Zn alloy material and a preparation method thereof, the Al-Zn alloy material comprises the following components in percentage by weight: Zn 8-12 wt.%, Mg 2.8-3.2 wt.%, Cu 1.2-1.5 wt.%, Zr 0.1-0.2 wt.%, and the balance is Al. On the one hand, the high Zn content changes the nucleation and growth kinetics of the η' phase, and increases the volume fraction of intragranular precipitates. On the other hand, the Al3Zr dispersed phase formed by the Zr element effectively pins dislocations and grain boundaries, inhibits recrystallization and limits the segregation of solute atoms to grain boundaries, thereby significantly inhibiting the continuous precipitation of grain boundaries and the expansion of PFZ.

The invention provides a method and a system for simulating and predicting tensile strength of aramid paper, relates to a composite material of the aramid paper and a use finite element method, and belongs to the technical field of electric digital data processing. By constructing the interface phase field model, the equivalent material field representing the three material phases can be generated, so that the phase field model can be used for analyzing the crack propagation problem of material attribute mutation. According to the method, a dynamic phase field model basic equation containing an interface phase field and a crack phase field is given, and the tensile strength of the aramid paper composite material can be obtained by combining finite element analysis. According to the method, when the tensile strength of the aramid paper is predicted, the real microstructure characteristics of the aramid paper, including the diameter and length of fibers, the random distribution of the fibers, the volume fraction of the fibers and the porosity, are fully considered; when the tensile strength is predicted, the volume fraction of a fiber reinforced material, the volume fraction of pores, the strength and critical energy release rate of an interface, the strength and critical energy release rate of a matrix and the like can be used as input characteristics.

The invention relates to composite powder particles of an open arc surfacing NbC phase reinforced high-boron alloy. The composite powder particles with the particle size of 10-12 meshes are prepared through the preparation process steps of screening and weighing powder components contained in the composite powder particles, dry powder mixing, adding of water glass for wet powder mixing, rotary bonding and granulation of wet powder, low-temperature sintering and powder particle screening. And carrying out self-protection open arc surfacing on the composite powder particles and an ER304 stainless steel solid welding wire of phi 2.5 to prepare the high-boron alloy. An ER304 welding wire and metal chromium powder are used for surfacing to form a high-boron alloy with high chromium content, and a main wear-resistant phase which comprises a primary M2B phase and an M23 (C, B) 6 phase and has the volume fraction of 60-70% is obtained; the content of Ti, Nb and Si components is optimized to regulate and control the number and distribution of carbon atoms, and an austenite matrix strengthened through dispersion precipitation of NbC is obtained; the microhardness of the surfacing high-boron alloy can reach 1500-1980 HV, and the surfacing high-boron alloy shows excellent wear resistance. The composite powder particle can be used for surfacing a wear-resistant alloy layer bearing impact load for parts, such as surfacing the inner wall of a sand blasting pipe or the inner wall of a concrete conveying pipe.

The invention discloses a creep-resistant magnesium alloy with high elasticity modulus and high damping and a preparation method thereof, and the creep-resistant magnesium alloy with high elasticity modulus and high damping comprises the following components in percentage by mass: 1.2%-3.5% of Zn element, 2.5%-12% of Gd element, 0.5%-6% of Yb element, 0.15%-1.2% of Ni element, 0.3%-0.8% of Mn element, 0-0.5% of Cu element, 0.1%-5% of HRE element and the balance of Mg element. The HRE element is one or more of a Dy element, a Sm element and a Tb element, and the mixing enthalpy delta H of the creep-resistant magnesium alloy with the high elastic modulus and the high damping is-1.1 kJ / mol to-0.2 kJ / mol. The creep-resistant magnesium alloy with high elastic modulus and high damping is suitable for the fields of aerospace, precise instruments, transportation, 3C electronics and the like, and has remarkable technical and economic values.

The invention discloses a preparation method of a high-strength and high-wear-resistance tungsten carbide hydrophobic layer on the surface of a steel and iron material, which comprises the following steps: 1) obtaining the steel and iron material with a carburized layer on the surface through pre-carburization; (2) a tungsten layer and an iron layer are prepared on the surface of the carburized steel material in sequence, aminated polystyrene microspheres are added in the iron layer preparation process, and a large number of aminated polystyrene microspheres are distributed on the interface between the tungsten layer and the iron layer; (3) carburizing treatment is conducted, the aminated polystyrene balls are decomposed at high temperature, the tungsten layer is converted into a tungsten carbide layer, and a rough interface is formed between the tungsten carbide layer and the iron layer; and (4) removing the iron layer, and modifying with a low-surface-energy substance to finally obtain a rough tungsten carbide layer and a hydrophobic layer on the surface of the rough tungsten carbide layer. The hydrophobic layer prepared through the method is high in strength and hardness, excellent in wear resistance, high in film-substrate binding force, good in hydrophobicity and corrosion resistance, easy and convenient to operate, high in applicability and high in production efficiency.

The invention relates to a homogenized diamond / silicon carbide composite material as well as a preparation method and application thereof, in particular to the homogenized diamond / silicon carbide composite material which is based on a solvothermal process and is prepared by the following steps: firstly, dipping diamond particles in a precursor reaction solution to obtain a blend of diamond and the precursor reaction solution; and secondly, heating the blend for gelation-curing, and then performing carbonization and siliconizing to obtain the homogenized diamond / silicon carbide composite material. The preparation method provided by the invention solves the problems of non-uniform distribution of silicon carbide and silicon, poor comprehensive performance and the like in the prior art.

The present application relates to the technical field of biomass catalytic material, and particularly relates to a biomass waste derived biochar based single-atom catalyst and a preparation method thereof.A specific technical scheme is as follows: the preparation method of the biomass waste derived biochar based single-atom catalyst comprises the following steps: (1) after drying and grinding of agricultural and forestry waste, the agricultural and forestry waste is mixed with a nickel nitrate solution to obtain a mixture; (2) after drying of the mixture, the mixture is calcined under N2 atmosphere and negative pressure to obtain a biochar loaded nickel single-atom catalyst.The catalyst has the characteristics of low cost, simple and easy-to-operate preparation method, and excellent catalytic performance for tar high-temperature catalytic reforming reaction.

The invention discloses a gradient nanostructure high-entropy alloy and a preparation method thereof, and belongs to the technical field of alloy preparation, the high-entropy alloy is composed of iron, manganese, aluminum, nickel, chromium and copper according to the atomic ratio of 32-36: 28-32: 14-16: 7-9: 7-9: 4.5-5.5; the high-entropy alloy is excellent in performance, the price of the high-entropy alloy is lower than that of other high-entropy alloys in the market, and the problems that an existing high-entropy alloy is high in cost and poor in performance can be effectively solved.

The invention relates to a preparation method of a magnesium-lithium alloy plate, in particular to a preparation method of a high-toughness magnesium-lithium alloy plate. The invention aims to solve the technical problems that the Mg2Si phase in the existing magnesium-lithium alloy has larger grain size and poorer formability, and the magnesium-lithium alloy plate prepared by the conventional rolling process is difficult to achieve high toughness. The Al-27Si eutectic alloy formed by spray deposition is added in the smelting process, and an Mg2Si phase with a small size is introduced, so that a fine grain structure and better formability can be obtained; according to the method, high-density dislocation is introduced through a rolling process of heating and then cooling, the microstructure of the magnesium-lithium alloy is adjusted, second-phase particles are refined, a large number of fine recrystallized grains are generated, and then the comprehensive mechanical property of the magnesium-lithium alloy is improved through high-temperature annealing; the tensile strength of the high-strength and high-toughness double-phase magnesium-lithium alloy plate prepared by the preparation method disclosed by the invention is 280-305 MPa, and the ductility is 8-16%.

This invention discloses a method for preparing a high-strength, high-thermal-conductivity Mg-Zn-Cu-Mn magnesium alloy, belonging to the field of magnesium alloy preparation technology. Metal raw materials are prepared according to the atomic percentage ratio of each constituent element in the Mg-3Zn-3Cu-xMn alloy (0≤x≤1). Then, alloy melting, homogenization treatment, and hot extrusion deformation are performed sequentially. The extrusion temperature is 260-270℃, and the extrusion speed is 0.3-0.6 mm / s. This invention achieves homogeneous dispersion of Mn to cluster precipitation in the Mg-Zn-Cu magnesium alloy through Mn alloying modification treatment. When 0.6 wt.% Mn is added, the alloy exhibits the best thermal conductivity and tensile strength. This invention refines the grain size of the Mg-Zn-Cu-Mn magnesium alloy and eliminates some casting defects, thereby further improving the alloy's strength and thermal conductivity.

The invention discloses a MIM injection molding process for a NdFeB magnet, comprising the steps of adjusting raw material ratio, melting and strip-spinning to form strip-shaped sheets, crushing, mixing with a mixed solution of a coupling agent and ethanol, mixing and kneading with a binder, oriented injection molding, extraction degreasing, thermal degreasing, sintering, magnetizing and the like. By optimizing raw material components, oriented injection molding, extraction degreasing, thermal degreasing and the like, near-net-shape forming of a complex shape is achieved, and the MIM NdFeB magnet can achieve excellent magnetic properties with residual magnetization intensity ≥1.04 T and maximum magnetic energy product ≥29.7 MGOe, and greatly improves the magnet yield and production efficiency.

The invention belongs to the technical field of aluminum alloy materials, and particularly discloses a microalloyed aluminum-copper-cerium heat-resistant aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 7%-9.5% of Cu, 1.3%-2.3% of Ce, 0.1%-0.5% of Mn, 0.1%-0.4% of Sc, 0.1%-0.4% of Zr, 0.1%-0.5% of Mg, 0.1%-0.3% of Si and the balance Al and inevitable impurities, the content relation of Cu and Ce is that Cu is equal to 2Ce + 4%-5%, and the content relation of Mg and Si is that Mg is larger than 1.5 Si. The aluminum alloy has high yield strength and high tensile strength in a high-temperature environment, the yield strength and the tensile strength at the temperature of 300 DEG C are 235-248 MPa and 245-257 MPa respectively, the ductility is 4-5%, the yield strength and the tensile strength at the temperature of 400 DEG C are 100-106 MPa and 105-110 MPa respectively, the ductility is 9-10%, and the aluminum alloy is obviously superior to a traditional ZL206 alloy and a traditional ZL207 alloy.

The invention discloses medium-carbon medium-manganese high-wear-resistance steel with a spheroidized ghost pearlite structure and a preparation method of the medium-carbon medium-manganese high-wear-resistance steel. The medium-carbon medium-manganese high-wear-resistance steel comprises the following chemical elements in percentage by mass: 0.3-0.5% of C, 4-7% of Mn and the balance of Fe and other inevitable impurities. The matrix is martensite, retained austenite is dispersed on the martensite matrix, and the volume fraction of the retained austenite is 20-45%. According to the method, a spheroidized ghost pearlite structure combining spherical retained austenite and martensite is obtained in the medium-carbon medium-manganese steel mainly through multi-stage treatment, and the spheroidized ghost pearlite structure has the ultra-fine grain size and the high retained austenite volume fraction; the special structure enables the medium-carbon medium-manganese steel to have high hardness and high wear resistance. The volume fraction and stability of the retained austenite are improved by regulating the austenite in the pearlite to be spherical, martensite is used as a matrix, excellent strength and plasticity and wear resistance are achieved, and the heat treatment efficiency is greatly improved.

The present invention provides an AlSi powder material and a preparation method and application thereof. The AlSi powder material comprises metal Si, Mg, Zr, Mn, Er and a balance of Al and optionally Sc. The present invention partially or completely replaces the metal Sc in the AlSi material by adding metal Er and Zr to the Al‑Si alloy system, and strictly controls the content of each of the above metal components within a suitable range, so as to give full play to the synergistic effect between the metal components and improve the mechanical strength of the Al‑Si alloy system. The characteristics of Er having a small solid solubility in the Al matrix, Er having a strong precipitation driving force in the Al matrix, and Zr being able to form a kinetically stable L12Al3 (Er, Zr) phase with Er can make the AlSi material have better mechanical properties. Adding the abundant and low-priced metal Er to replace the metal Sc therein can also reduce the cost of the AlSi powder material.