19 results about "Solid solubility" patented technology

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.

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 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.

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.

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.

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.

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 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.

The invention discloses a preparation method of a short-process high-purity alloy with large melting point difference and low solid solubility, which comprises a powder canning step, a vacuum treatment step and a finished product forming step, and adopts powder as a raw material, the composition proportion is flexible, the preparation process does not need a conventional sintering process or hot isostatic pressing, the forming and deformation processing are synchronous, the process is simple, convenient and efficient, and the production cost is low. The cost is low. The oxygen content of the powder in the sealed container is reduced by utilizing oxide decomposition balance, pressure reduction, temperature increase and oxide decomposition in the degassing stage, and the method has the main advantages that the powder material is purified, the oxygen content is smaller than 100 ppm, the purity is larger than or equal to 99%, short-process forming is achieved, and the product density is high.

The invention particularly relates to a method and a system for testing hydrogen absorption and desorption rate constants of zirconium-like alloy, and belongs to the technical field of material performance testing. The method comprises the following steps: S1, carrying out high-pressure gas-phase hydrogen permeation test on a zirconium-like alloy sample at a test temperature, and calculating a hydrogen desorption rate constant of the zirconium-like alloy sample by combining the hydrogen dissolution limit solid solubility of the zirconium-like alloy sample at the test temperature; s2, performing low-pressure gas-phase hydrogen permeation test on the zirconium-like alloy sample at the test temperature, and calculating the hydrogen absorption rate constant of the zirconium-like alloy sample by combining the hydrogen desorption rate constant of the zirconium-like alloy sample; and S3, changing different test temperatures, and repeating S1 and S2 to obtain the change rule of the hydrogen absorption rate constant and the hydrogen desorption rate constant of the zirconium-like alloy sample along with the temperature. The system is used for implementing the method. The method realizes accurate and reliable determination of the hydrogen absorption and desorption rate constants of the zirconium-like alloy.

The invention discloses a high-conductivity 6101 aluminum alloy material and a preparation method thereof. The core of the method is that a direct aging process is adopted, and the method comprises the following steps: firstly, carrying out solid solution on a 6101 aluminum alloy blank at 530 + / -5 DEG C for 60-120 seconds; then, a traditional water quenching step is omitted, the steel plate is immediately placed in a forced convection air furnace, and the steel plate is continuously and controllably air-cooled to 160 + / -5 DEG C from 530 DEG C through hot air; and finally, carrying out artificial aging at 160 + / -5 DEG C for 15-24 hours. Through a slow cooling process in a temperature zone of 200-400 DEG C, solute atom precipitation is promoted, a wide precipitation-free precipitation zone (PFZ is greater than or equal to 300nm) is formed, and the solid solubility of a matrix is remarkably reduced. The product obtains excellent high conductivity (greater than or equal to 58% IACS) while ensuring sufficient mechanical properties (tensile strength is greater than or equal to 200 MPa), and is especially suitable for application scenarios with strict requirements on conductivity, such as power transmission and new energy automobile high-voltage connecting pieces.

The application discloses nitrogen-doped high-entropy alloy powder and a preparation method thereof. In order to solve the problems of low gap nitrogen solid solubility, easy precipitation of brittle metal nitride and uneven composition in the existing physical nitriding technology, the application adopts anhydrous metal halide, alkali metal amide and alkali metal azide as a reaction precursor. In the process of closed heating reaction, the amide is melted to provide a continuous liquid phase mass transfer medium; the azide is decomposed to release alkali metal and local high-pressure nitrogen gas; the alkali metal drives the metal halide to co-reduction; in the initial stage of nucleation and growth, the multi-component metal atoms are combined with the amino free radicals and high-pressure nitrogen gas in the system to directly embed nitrogen atoms into the lattice gap position, and high-concentration in-situ solid solution doping is completed. The application avoids the diffusion resistance of gas molecules in the traditional gas-solid nitriding, and realizes the preparation of alloy powder with high purity, uniform phase and no precipitation of brittle metal nitride.

The invention relates to the technical field of ceramic powder, and discloses quaternary composite functional ceramic powder and a preparation method thereof.The quaternary composite functional ceramic powder is prepared from, by weight, 396.1-563.4 parts of a coordination passivation metal alkoxide solution, 396.1-563.4 parts of a complexing passivation metal alkoxide solution, 396.1-563.4 parts of a complexing passivation metal alkoxide solution, 396.1-563.4 parts of a complexing passivation metal alkoxide solution, 396.1-56.2 30.0 to 62.5 parts of a silicon source; 80.0 to 85.0 parts of a vanadium-containing active precursor solution; 4.5 to 8.0 parts of a pH (Potential of Hydrogen) regulator; and 200.0 to 250.0 parts of a water carrying agent. Wherein the coordination passivation metal alkoxide solution B is a mixed solution prepared by reacting an aluminum source, a titanium source, ethanol and acetylacetone; the vanadium-containing active precursor solution A is a mixed solution prepared by reacting a vanadium source, water and 1, 4-butanediol. The problems of component segregation, vanadium volatilization and hard agglomeration are solved, and the obtained quaternary composite functional ceramic powder has high chemical uniformity, high vanadium solid solubility, excellent dispersity and good sintering activity.

The invention discloses light-cured alumina-based ceramic slurry and alumina-based ceramic. The preparation method comprises the following steps: mixing Al2O3, La2O3 and ammonium metatungstate, and carrying out ball milling, drying and sieving to obtain ceramic powder; mixing the ceramic powder with photosensitive resin, a photoinitiator and a dispersing agent to prepare ceramic slurry; forming a green body with a honeycomb structure through photocuring 3D printing; the preparation method comprises the following steps: performing degreasing and sintering treatment, diffusing W < 6 + > to a grain boundary and a surface and generating WO3 in situ by utilizing the characteristic that the solid solubility of the W < 6 + > in Al2O3 is reduced in a sintering cooling process, and meanwhile, inhibiting abnormal growth of grains by using La2O3 as a grain boundary pinning agent, thereby finally preparing the WO3-containing aluminum oxide-based ceramic. The WO3-containing alumina-based ceramic prepared by the preparation method disclosed by the invention can be used for efficiently degrading tetracycline, sulfamethoxazole and ofloxacin under the irradiation of visible light.

The invention provides a multi-nanophase reinforced aluminum-based composite material and a preparation method and application thereof, and belongs to the technical field of composite materials. The multi-nanophase reinforced aluminum-based composite material disclosed by the invention comprises a ZrB2 nano-particle reinforced phase, an Al2O3 nano-particle reinforced phase and an Al (Er, Y) 3 multi-nanophase. The Al (Er, Y) 3 multi-nanophase is obtained by adding double rare earth (Er, Y) for coupling and strengthening, the Al (Er, Y) 3 multi-nanophase cooperates with a ZrB2 nano-particle strengthening phase and an Al2O3 nano-particle strengthening phase, agglomeration of nano-particles is avoided, wettability of the nano-particles is improved, the nano-particles are uniformly dispersed, the high-toughness and anti-fatigue multi-nanophase strengthened aluminum-based composite material is obtained, and a high-precision thin-wall pipe can be prepared; meanwhile, double rare earth (Er, Y) is coupled and strengthened, so that the problems that single rare earth Er is high in price, low in solid solubility, large in quantity, easy to form coarse compounds and limited in performance improvement are solved.

The present application belongs to the field of coating, and particularly relates to a hard wear-resistant TaN / MoS2 composite coating and a preparation method thereof. The present application uses a Ta target and a MoS2 target as target materials, N2 as a reaction gas, and argon as a sputtering gas, and obtains a TaN / MoS2 composite coating on a substrate by direct current magnetron sputtering of the target materials; a total flow of 40 sccm is adopted, and the nitrogen flow is fixed at 4 sccm, and the argon flow is 36 sccm. The solid solubility of Mo atoms and the MoS2 content are changed by changing the power of the MoS2 target material, the hardness and toughness of the coating are improved by solid solution strengthening effect enhancement and grain boundary strengthening, and meanwhile, the special structure of the good mechanical properties and the strong covalent bond and weak van der Waals bond of MoS2 is combined, so that the tribological performance of the coating is improved.

The present application relates to a kind of gradient current net blocking device, vacuum induction melting furnace and blocking method, gradient current net blocking device generates gradient current net in the case of being passed into pulse current, gradient current net blocking device is in vacuum induction melting furnace, for the inclusion in the vacuum alloy before casting is blocked, inclusion includes oxygen, nitrogen, sulfur, and the content of inclusion is reduced by blocking.The gradient current net is formed by pulse current in the chute, and the gradient current net forms resistance to the movement of inclusion in high-temperature alloy melt, thereby filtering and removing inclusion from high-temperature alloy melt;In addition, since the pulse current changes the free energy of high-temperature alloy melt system, the solid solubility of oxygen, nitrogen and sulfur in high-temperature alloy melt is reduced, the discharge of oxygen, nitrogen and sulfur gas components is promoted, and the solid solubility of oxygen, nitrogen and sulfur in high-temperature alloy melt is further reduced;Pulse current ensures that larger current gradient is constructed under low energy consumption, so that the method of the present application is green and energy-saving.