59 results about "Solid solubility" patented technology

The invention relates to the technical field of magnesium alloys, in particular to a high-toughness rare earth-containing magnesium alloy and a preparation method thereof.The high-toughness rare earth-containing magnesium alloy is prepared from, by weight, 3-8 parts of Zn, 1-5 parts of RE, 0.5-3 parts of Al, 0.1-1 part of Mn, 0.05-0.3 part of Zr and the balance Mg; rE is a combination of Y, Nd and La in a mass ratio of (2-3): 1: (0.5-1). Zinc is used as a secondary main element to replace part of aluminum, efficient solid solution strengthening is achieved through high solid solubility of zinc in magnesium, meanwhile, the morphology and distribution of a precipitated phase are regulated through rare earth, a beta-MgZn2 phase is formed, the high-temperature stability is better, balance optimization of strength, toughness and corrosion resistance is achieved, meanwhile, the welding performance of the alloy is improved through combination of Y, Nd, La and Zr, and the welding performance of the alloy is improved. The hot crack tendency is reduced, the brittle phase problem of a traditional high aluminum alloy is avoided, and the corrosion resistance and the machining performance are synergistically improved.

The invention discloses an ion doping method based on first principle calculation and application thereof. Relates to the technical field of building materials. The method comprises the following steps: firstly, constructing a cement clinker mineral phase crystal structure model, and performing structural relaxation on the model to obtain a model crystal structure with a determined lattice constant; secondly, analyzing and optimizing microstructure changes and corresponding energy state changes of various mineral phases in the ion doping process by utilizing a quantum mechanical simulation means, representing the solid solubility of doped ions and mineral phase structures through the defect formation energy of ion doping, forming energy being negative reaction process being spontaneous process, the closer to 0, the better the solid solubility, and the more to 0, the better the solid solubility; therefore, how to enhance the hydration reaction activity and improve the strength by ion doping is disclosed. The mechanical property, durability and corrosion resistance of the cement are improved by accurately regulating and controlling the characteristics of the multi-mineral-phase structure.

The invention discloses a rare earth aluminum alloy conductor material which comprises magnesium, silicon, boron and a rare earth element, the rare earth element comprises one of lanthanum, cerium, yttrium and erbium, and the balance is aluminum. Wherein in terms of mass fraction, the mass fraction of the magnesium is 0.2%-0.8%, the mass fraction of the silicon is 0.1%-0.5%, the mass fraction of the boron is 0.01%-0.15%, the mass fraction of the rare earth element is 0.1%-0.15%, and the balance is aluminum. Trace elements are introduced into the aluminum alloy to serve as microalloying elements. The atomic radius of the microalloying elements is generally much larger than that of aluminum, the solid solubility of the microalloying elements in an aluminum matrix is very low, lattice distortion and electron scattering caused by a large number of solute atoms are avoided, and the negative influence on conductivity is reduced; and the electron orbits of the compounds are complex, so that stable intermetallic compounds or second-phase particles can be easily formed.

The invention relates to a low-cost high-strength corrosion-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 6-11% of Al, 0.4-0.6% of Zn, 0.2-0.6% of Mn, 0.2-0.4% of Y, 0.2-0.6% of Ca and the balance of Mg and inevitable impurities. A small amount of Ca and Y elements are added, on one hand, an alpha-Mg matrix structure can be refined, beta phase distribution is more uniform, and the mechanical property is improved; and on the other hand, the solid solubility of the alloy element Y in an alpha-Mg matrix can be improved by adding the Ca element, the compactness of a surface oxidation film and a corrosion product film is promoted, compared with other rare earth elements, the potential difference between Al-Ca and Al-Y phases formed by Ca, Y and Al and the magnesium matrix is smaller, micro galvanic corrosion is smaller, and the corrosion resistance of the alloy is remarkably improved.

The invention discloses a high-conductivity super-heat-resistant aluminum alloy wire and a preparation method thereof, and the high-conductivity super-heat-resistant aluminum alloy wire comprises the following chemical components in percentage by mass: 2.0-2.5% of Ce and the balance of Al, the method comprises the following steps: firstly, carrying out gas-assisted continuous casting extrusion to obtain an alloy rod which contains alpha-Al with extremely low Ce solid solubility and an All1Ce3 phase with a small size, and then carrying out drawing and annealing treatment; by adding a small amount of Ce and combining gas-assisted continuous casting extrusion and annealing, the aluminum alloy wire has excellent strength, conductivity and heat resistance. The super-heat-resistant aluminum alloy wire prepared by the invention has relatively high conductivity, and the loss rate of a line during operation can be remarkably reduced.

This invention relates to the field of welding electrodes for duplex stainless steel, specifically to a welding electrode for duplex stainless steel and its preparation method. When residual stress at the weld seam of 2209 duplex stainless steel is eliminated through high-temperature heat treatment, the mechanical properties and corrosion resistance of the weld seam significantly decrease. To address the above technical problem, this invention provides a welding electrode for duplex stainless steel that effectively slows down the phase transformation rate during high-temperature heat treatment, avoids excessive austenite formation, and maintains the balance of the duplex structure. The electrode coating composition specifically includes lanthanum hexaboride and Ti-6Al-4V alloy, which have grain-refining effects and simultaneously inhibit the precipitation of harmful intermetallic phases. This effectively suppresses the precipitation of harmful phases such as the σ phase during weld heat treatment, ensures the solid solubility of chromium and molybdenum, and allows the weld seam to retain excellent comprehensive properties after high-temperature treatment.

The invention discloses a nuclear waste containing material and a preparation method and application thereof, and belongs to the technical field of nuclear waste treatment.The nuclear waste containing material is characterized in that site-specific doping of trivalent or tetravalent nuclides is achieved through trivalent or tetravalent nuclides, namely, A-site doping is conducted on Lu4Hf3O12 through Z < 3 + > or B-site doping is conducted on Lu4Hf3O12 through Z < 4 + >, the solid solubility of the A-site Z < 3 + > is as high as 25 mol%, and the solid solubility of the B-site Z < 4 + > is as high as 40 mol%; compared with a traditional pyrochlore-based material, the nuclide containing capacity is remarkably improved, the relative density of the nuclear waste containing material is larger than or equal to 95%, and the grain size can reach 1-5 microns; the prepared nuclear waste containing material is excellent in leaching resistance, and the leaching rate of the nuclear waste containing material is 2-4 orders of magnitude lower than that of a conventional curing material; the nuclear waste containing material prepared by the invention has better long-term chemical stability, and the mass loss rate of a highly-doped sample after long-term leaching is reduced by 21% compared with that of a low-doped sample.

The invention provides a high-toughness corrosion-resistant Ti-Zr-Ta alloy and a preparation method thereof, and belongs to the technical field of alloy materials. The high-toughness corrosion-resistant Ti-Zr-Ta alloy comprises the chemical components of 1-4 at.% of Ta and the balance Ti and Zr, any element in Ti and Zr is a main matrix element of the alloy and can be replaced with each other to form a continuous solid solution structure, the high-toughness corrosion-resistant Ti-Zr-Ta alloy is prepared through smelting and high-pressure heat treatment processes, and the high-toughness corrosion-resistant Ti-Zr-Ta alloy is prepared through the high-pressure heat treatment process. On one hand, the high-pressure heat treatment increases the solid solubility of Ta in a matrix, plays a role in solid solution strengthening and improves the corrosion resistance; and on the other hand, the alpha phase transformation behavior can be inhibited, so that a full-beta-phase structure is obtained, and the plasticity and toughness are greatly improved.

This application discloses a perovskite-structured high-entropy ceramic material with excellent dielectric temperature stability. The chemical formula of the high-entropy ceramic material is (Ca... 0.2 Sr 0.2 Ba 0.2 Mg 0.2 Bi 0.1 Na 0.1 (Ti1) x Zr x O3, x=0.05~0.2. This application employs an A-site high-entropy material composition design that enables elements to break through the solid solution limit, achieving greater solid solubility in the material system. By using Zr 2+ Ti at the B site in ion-substituted ceramics 2+ The composition design approach successfully achieved B-site ion doping, resulting in well-grown, dense grains within the ceramic. The sample microstructure exhibited few pores, with elements uniformly distributed throughout the ceramic without agglomeration. By optimizing and controlling the ceramic's microstructure, the dielectric ceramic obtained in this application possesses a high dielectric constant and excellent temperature stability, with capacitance-temperature variations meeting both X7R and X6R capacitor standards.

The invention discloses an up-conversion luminescence time sequence regulation color-changing material, color-changing ink and a preparation method and application thereof, the chemical general formula of the material is SrMoO4: xYb < 3 + >, yHo < 3 + > and zNa < + >, x is the molar doping amount of Yb < 3 + >, y is the molar doping amount of Ho < 3 + >, z is the molar doping amount of Na < + >, 0.10 < = x < = 0.40, 0.01 < = y < = 0.03, and 0.21 < = z < = 0.31. According to the material, under the condition of charge compensation ion Na < + > co-doping, the solid solubility of sensitizer ions Yb < 3 + > in SrMoO4 crystal lattices is remarkably improved, and under the condition of Na < + > excessive charge compensation, the material is remarkably superior to the upconversion luminescence effect of other charge compensation enhanced heterovalent doping systems reported in literatures; the color-changing ink for advanced dynamic anti-counterfeiting and the application method thereof are designed and developed by combining the remarkably enhanced up-conversion luminescence and the excellent time sequence regulation color-changing characteristic of the material, and the color-changing ink has a wide application prospect in the field of dynamic fluorescent anti-counterfeiting.

The present invention relates to the field of alloy preparation technology, and discloses a method for preparing a high-performance tungsten-rhenium alloy, comprising the following steps: Step 1: Preparation of tungsten-rhenium alloy powder, dissolving a certain proportion of ammonium metatungstate, ammonium rhenate, and oxalic acid in deionized water, and placing the solution in a magnetic stirrer for heating to 100-120°C. The solution is allowed to react for 3-5 hours, and the solid content of the precursor solution is 25%-32%. Precursor powder is then prepared using a spray drying device, and the spray drying parameters are set: inlet air temperature of 200-230°C, outlet air temperature of 100-120°C, atomizer speed of 300-350r / min, and feed rate of 1-2L / h. The tungsten-rhenium precursor is then hydrogen reduced, the tungsten-rhenium precursor is spread flat in a calcined boat, the calcined boat is then placed in a hydrogen reduction furnace, the hydrogen reduction furnace is vacuumed, and hydrogen is then introduced. The preparation method proposed in the present invention can prepare a single-phase tungsten-rhenium alloy with good solid solubility, high high-temperature strength, high hardness, high density and certain ductility.

Neutron shielding comprising a metal-hydride metal composite: the metal-hydride metal composite comprising: a metal matrix; and a plurality of metal-hydride particles dispersed within the metal matrix; wherein, the fraction of metal-hydride in the metal-hydride metal composite is at least 1 mol % and the volume fraction of metal-hydride in the metal hydride metal composite is no higher than the ratio of the solid solubility limit of hydrogen in the metal matrix and the molar fraction of hydrogen in the metal-hydride.

The invention discloses a high-strength and high-heat-resistance Al-Fe-Zr-Y alloy conductive material and a preparation method thereof.The material is prepared from, by weight, 0.5%-1.5% of Fe, 0.1%-0.2% of Zr, 0.05%-0.07% of Y and the balance aluminum; firstly, an alloy rod is obtained through gas-assisted continuous casting extrusion, the alloy rod contains an Al6Fe phase of dozens of nanometers to hundreds of nanometers and an alpha-Al matrix with high Y solid solubility, then a high-density nanoscale Al3 (Y, Zr) phase is formed through aging to stabilize the Al6Fe phase and improve the heat resistance of the alloy, and meanwhile, the Al6Fe phase and the Al3 (Y, Zr) phase cooperate to improve the strength level of the alloy; the conductive material is low in raw material cost, high in production efficiency and beneficial to popularization and application.

According to the plating solution for the pre-coated aluminum-silicon alloy coating hot-formed steel plate with the excellent painting performance, the hot-formed steel plate and the manufacturing method and application, compared with the prior art, Cu, Sn and Cr are added into the plating solution, so that the problem of poor painting adhesion caused by low coating surface roughness after hot forming of a thin pre-coated layer can be solved; cu and Cr in the plating solution form precipitates such as Al2Cu and Al7Cr in the cooling process after coating, and in the hot forming heating process, the Al2Cu and Al7Cr on the surface of a plating layer prevent the flowing of molten Al, so that the Al2Cu and Al7Cr regions and other regions form different fluctuations, and the higher surface roughness of the surface of the plating layer is ensured; a certain amount of Sn (higher than solid solubility) is added into the plating layer, and Sn separated out of the surface of the plating layer also has the same effect, so that higher surface roughness, plating layer paint adhesion and corrosion resistance are ensured.

The invention discloses a method for detecting the solid solution content of rare earth elements in a steel material, which comprises the following steps: firstly, electrolyzing a steel sample which is ground and polished until the surface has no macroscopic defects in a KCl or LiCl + tartaric acid (C4H6O6) aqueous solution, and filtering the electrolyzed suspension to realize the separation of solid-solution rare earth atoms from the rare earth elements in a second phase; then, concentrating the filtered solution, and cooling to a constant volume; and finally, measuring the concentration of the rare earth element in the solution by using an inductively coupled plasma mass spectrometer (ICP-MS), and calculating by using a formula to obtain the solid solubility of the rare earth element in the steel and iron material. The method can safely, reliably and cheaply measure the solid solubility of rare earth elements in steel and iron materials in laboratory research and production practice, and has the characteristics of high sensitivity, safe experimental process, efficient pretreatment process, cheap and easily available medicines and the like.

The invention relates to the technical field of thermoelectric materials, and discloses a method for improving thermoelectric performance of a tin selenide block material, which comprises the following steps of: 1, mixing Sn powder and Se powder according to a stoichiometric ratio, and adding Na2S and Li2S as codopants; 2, the mixed raw material is subjected to vacuum sealing treatment and then subjected to solid-phase melting reaction treatment, and a tin selenide cast ingot is obtained; step 3, carrying out ball-milling refining on the molten product to obtain tin selenide powder; and 4, carrying out spark plasma sintering on the tin selenide powder, and applying pulse current in the sintering process to obtain the tin selenide block material. By introducing alkali metal sulfides Na2S and Li2S, the solid solubility of alkali metal in a tin selenide matrix can be remarkably improved, so that the electrical transport performance and thermoelectric performance of the tin selenide material are improved.

This invention discloses a long-life, ablation-resistant hafnium-zirconium-based multi-component boride high-solid-solution, low-oxidation coating for carbon materials and its preparation method, mainly addressing the problems of low solid solubility, easy oxidation, and poor ablation resistance of existing coatings. The method includes: 1) uniformly mixing HfB2, ZrB2, TaB2, and TiB2 powders at a specific molar ratio and processing to obtain mixed ceramic powder; 2) mixing the ceramic powder, deionized water, ethanol, and 2wt.% PVA solution at a certain mass ratio and ball milling to obtain a mixed slurry; 3) setting relevant parameters and spray granulating the slurry to obtain boride powder; 4) subjecting the powder to inductive plasma spheroidization to obtain a solid solution powder; 5) spraying the solid solution powder onto a carbon substrate via vacuum plasma to form an ablation-resistant coating with low oxygen content and high solid solubility. The coating of this invention exhibits good solid solubility and low oxidation, effectively improving the service life of the boride ceramic coating on carbon materials.

The invention provides a method for improving the forming performance of ultra-low carbon steel by regulating and controlling the Al / N value, and relates to the technical field of ultra-low carbon steel. The method comprises the steps of smelting, forging, hot rolling, cold rolling and annealing. Wherein the mass percent of each component of the cast ingot is Clt; the steel comprises, by weight, 0.03% of Fe, less than or equal to 0.14% of Mn, 0.01-0.1% of Al, 0.0025-0.01% of N and the balance iron and residual elements, and the Al / N value ranges from 6.2 to 40. According to the method, the nitride AlN can be rapidly generated by effectively utilizing the strong affinity of the alloy element Al and the N element, the solid solubility of free interstitial N atoms in steel is reduced, and the problem that the forming performance is weakened due to excessive N element is solved; after the Al / N value is increased, the size of a nitride precipitated phase can be increased, the strength of a gamma texture ({111} / / ND) component is enhanced, and the strength of a Goss texture ({100} lt; 001gt, 001gt; the component strength eliminates the yield platform of the ultra-low carbon steel, and improves the percentage elongation after fracture and the plastic strain ratio r value; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The method comprises the steps that after samarium-cobalt permanent magnet powder and PrO2 powder are mixed, orientation forming, sintering, solid solution and aging treatment are carried out, PrO2 reacts with the samarium-cobalt permanent magnet at the high temperature, a (Sm, Pr) (Co, Fe, Cu and Zr) alloy matrix is formed, the saturation magnetization intensity of the matrix is improved, and the coercive force and the residual magnetism of the samarium-cobalt permanent magnet material are synchronously improved. Meanwhile, by means of the relatively low solid solubility of Cu in a (Sm, Pr) (Co, Fe, Cu and Zr) alloy matrix, part of Cu is driven to be separated out to a grain boundary area, grain boundary Cu-rich phases are formed in the grain boundary area of the alloy matrix and are evenly distributed in the grain boundary area in a nano-particle shape, the pinning strength of domain walls in the grain boundary area is improved, the coercive force is improved, and the magnetic field of the magnet is improved. Therefore, synchronous improvement of residual magnetism and coercive force of the samarium-cobalt permanent magnet material is ensured.

The invention discloses a high-strength and high-heat-resistance Al-Fe series alloy conductive material and a preparation method thereof, and the material comprises the following chemical components in percentage by weight: 0.5-1.0% of Fe, 0.4-0.6% of Zr and the balance of aluminum. Firstly, an alloy rod is obtained through gas-assisted continuous casting extrusion, the alloy rod contains an Al6Fe phase of dozens of nanometers to hundreds of nanometers and an alpha-Al matrix with the high Zr solid solubility, then a nanoscale Al3Zr phase is formed through low-temperature aging to stabilize the Al6Fe phase, the Zr element is sufficiently separated out through high-temperature aging to improve the conductivity of the alloy, and the alloy rod is prepared. The Al6Fe phase and the Al3Zr phase synergistically improve the mechanical property and the heat resistance of the alloy; the conductive material is low in raw material cost and beneficial to popularization and application.

The invention provides a preparation method of a soluble magnesium alloy with high iron content, and relates to the technical field of soluble magnesium alloys. According to the method, magnesium alloy is put into a low-carbon steel crucible to be sealed and then is subjected to heat preservation treatment at 800 DEG C for 5-15 h. The magnesium melt and the low-carbon steel crucible are subjected to interface reaction at high temperature, iron elements in the low-carbon steel crucible are diffused into the magnesium melt, meanwhile, the solid solubility of iron in magnesium at high temperature is higher than that at normal temperature, and the iron elements in the low-carbon steel crucible are continuously diffused into the magnesium melt through long-time heat preservation at high temperature; and the magnesium melt with the high iron content is formed. According to the diffusion method, the soluble magnesium alloy with the high iron content is formed in situ.

The invention relates to a MeTiO3 high-entropy dielectric ceramic material and a preparation method thereof, the chemical formula of the MeTiO3 high-entropy dielectric ceramic material is (Ca < 0-0.4 > Sr < 0-0.4 > Ba < 0-0.4 > Mg < 0-0.4 > Bi < 0-0.15 > Na < 0-0.15 >) TiO3, elements break through the solid solution limit, and higher solid solubility is obtained in a material system, so that a single-phase solid solution is obtained. The microstructure of the material is influenced by introducing entropy engineering, the optimized microstructure of the ceramic can reduce scattering of an electric field at a grain boundary, the dielectric loss is reduced, and the dielectric constant is improved. The high-entropy effect can promote the formation of a single-phase solid solution, so that a polar nanometer micro-region is formed in the material, and the dielectric loss of the material is reduced; the lattice distortion effect can enhance the polarization effect of the material, so that the dielectric constant of the material is improved; the hysteresis diffusion effect can reduce the grain size and enhance the grain boundary effect, so that the breakdown field strength of the material is improved. In addition, the entropy engineering design can also regulate and control the type and number of defects in the ceramic material, so that migration and distribution of electrons and ions are influenced, the sintering temperature is greatly reduced, the heat preservation time is shortened, and the production cost is remarkably reduced.

The invention discloses a preparation method of N-doped ZnO powder, and belongs to the technical field of material science. According to the method, the solid solubility of an N element in ZnO is improved by pre-doping an Al element, and efficient doping of N is realized by utilizing a high-concentration N environment generated by decomposing ammonium bicarbonate at a high temperature. The preparation method comprises the following specific steps: dropwise adding an aluminum nitrate solution into a zinc acetate solution, adjusting the pH value to be alkaline, centrifuging, washing and drying to obtain white powder, and carrying out heat treatment to obtain Al-doped ZnO nano powder; mixing and grinding the powder and ammonium bicarbonate, putting into a tubular furnace, putting calcium oxide solid powder beside the tubular furnace, heating in a vacuum closed state, and cooling along with the furnace to obtain the N-doped ZnO powder. According to the method, the problem that ZnO is difficult to dope with the N element is solved, the prepared powder has the advantages of being good in dispersity and narrow in particle size distribution, the process is simple, and the method is suitable for large-scale industrial production.

The invention relates to a preparation method of ultrahigh-purity iron with the purity of more than 6N grade, and relates to the technical field of steel and iron material processing, and the preparation method comprises the following steps: taking 3N-5N grade high-purity iron as a raw material, and performing solid-state region purification under an anti-oxidation condition by utilizing different solid solubility of ferrite and austenite on impurity elements in a solid state to obtain the ultrahigh-purity iron with the purity of more than 6N grade. Compared with zone melting, suspension melting, electromigration and other technologies adopted in existing ultra-high-purity iron preparation, the purity of the prepared ultra-high-purity iron is higher and reaches the 6N grade or above, and due to the fact that the heating temperature in the whole purification process is obviously reduced, the material is in a solid state, and the problems of gas impurity absorption and the like are solved.

This application discloses a high corrosion-resistant, non-magnetic austenitic stainless steel, its preparation method, and a wearable device, relating to the field of metal powder metallurgy technology. The stainless steel, by mass percentage, comprises: Cr: 22%–27%, Mn: 5%–9%, ​​Ni: 5%–9%, ​​Mo: 3%–7%, N: ≥0.6%, with the balance being Fe and impurities; its matrix microstructure is a single-phase austenite with supersaturated dissolved nitrogen. The preparation method includes mixing and granulation, injection molding, degreasing, vacuum sintering for densification, and solid-phase nitriding in a nitrogen-containing atmosphere with a nitrogen partial pressure of 4080 kPa during the cooling stage after sintering (1250–1100 °C). This application solves the problems of low nitrogen solid solubility and easy precipitation of brittle phases leading to decreased corrosion resistance and excessive magnetic properties caused by atmospheric pressure smelting by using a high-chromium composition system combined with a high-pressure nitriding process in the cooling stage. It achieves excellent properties that combine high strength, high hardness, high corrosion resistance, and complete non-magnetism, while reducing the nickel content and minimizing the risk of allergies.

The invention relates to the technical field of metal additive manufacturing, in particular to a method and system for predicting an additive aluminum alloy precipitation phase based on a non-equilibrium phase change model. The method comprises the steps that initial conditions are obtained, and a three-dimensional finite element model of the laser additive manufacturing process is established; the three-dimensional finite element model is operated, feature point data and a thermal cycle curve are extracted, and the feature point data comprise the solidification speed R and the temperature gradient G of the front edge of the solid-liquid interface of the molten pool; based on a rapid solidification theory, considering a solute capture effect, and calculating initial supersaturated solid solubility according to the feature point data; taking the thermal cycle curve and the initial supersaturation solid solubility as input conditions, performing numerical solution by adopting an unbalanced phase change model, and predicting a critical nucleation radius rppt * and a volume fraction fppt; and S2, verifying the critical nucleation radius and the volume fraction prediction result of the Si precipitation particles, and returning to the step S1 when the difference value is greater than a preset error. And the quantitative prediction of the size distribution and the volume fraction of the nano Si precipitated phase is realized.

The invention discloses a hexagonal phase silicon nanowire preparation method based on a gas-liquid-solid mechanism. The hexagonal phase silicon nanowire preparation method comprises the process steps of gold film deposition, chemical vapor deposition and the like. A stannic oxide precursor is introduced to participate in the growth process of the silicon nanowire by designing a self-compensation steam mechanism, and the characteristics of low melting point, low surface tension and low silicon equilibrium solid solubility of a tin element generated by disproportionation reaction of stannic oxide are utilized; on one hand, the thermodynamic driving force of hexagonal phase silicon nucleation is enhanced by dynamically improving the supersaturation degree of liquid drops, and on the other hand, the interface energy of the side wall of the nanowire is reconstructed by forming a tin wetting layer, so that the content of the hexagonal phase in the product is remarkably improved under the cooperative regulation and control of the dual action mechanism; and a simple, convenient, safe and efficient preparation way is provided for realizing the controllable growth of the high-purity hexagonal phase silicon nanowire.

A method for growing a multilayer graphene layer on a substrate by a simple process while restricting any impact on the substrate is provided. The graphene growing method includes: forming a carbon-containing metal thin film containing carbon in an amount exceeding the solid solubility solution on a substrate as a single layer, such that carbon content in the carbon-containing metal thin film is 3mol% or greater and 98mol% or less, subjecting the carbon-containing metal thin film to thermal treatment without introduction of a carbon raw material gas using an organic molecule, to form graphene and separating the metal contained in the carbon-containing metal thin film, and removing the metal separated, after completion of the thermal treatment.

The invention discloses a preparation method of a high-absorptivity silicon-based passivation contact battery, which comprises the following steps: firstly, providing a strategy for reducing a B-O recombination problem in p +-poly, introducing a p +-poly-Si layer formed by taking Ga as an alternative dopant into a battery structure, and enabling the Ga to have a high separation coefficient, low solubility and a larger atomic radius; the oxide damage can be reduced, and the p < + >-poly-Si contact performance can be improved; researches show that Ga doped in the SiOx layer has no significant peak value, the doping concentration is close to the solid solubility limit of Ga in Si, and a high Jsc value and excellent Voc are achieved.

The application discloses an Al-Fe-Mn heat-resistant high-strength rare earth reinforced aluminum alloy and a preparation method thereof, and belongs to the field of additive manufacturing technology.The aluminum alloy comprises Fe, Mn, Y, Sm, Er, V and Si in a mass percentage of 0.5-3 wt%, 0.5-2 wt%, 0.01-0.3 wt%, 0.05-0.2 wt%, 0.01-0.1 wt%, 0.01-0.3 wt% and 0.02-0.5 wt% respectively, and the balance is Al.The Y, Sm and Er rare earth elements are added to maintain the high-temperature stability of Al-TM particles, and the Mn and Fe elements are added to form a large number of dispersed distribution and heat-stable precipitated phases under the condition of the rapid cooling of 3D printing, so that the heat-resistant performance of the aluminum alloy is improved, and the solid solution strengthening effect can be achieved, and the problem of low solid solubility of a traditional Al-TM alloy is solved.