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38 results about "Phase composition" patented technology

A phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i.e. density, crystal structure, index of refraction, and so forth). The most familiar examples of phases are solids, liquids, and gases. Less familiar phases include: plasmas and quark-gluon plasmas;

In-situ identification analysis method for superfine non-metallic inclusions in steel

The invention discloses an in-situ identification analysis method for superfine non-metallic inclusions in steel, and mainly solves the technical problems that the superfine non-metallic inclusions in the existing steel are difficult to identify and extract and the microstructure and phase composition of the inclusions are difficult to characterize. According to the technical scheme, the method for detecting and analyzing the small-size non-metallic inclusions in the steel by using the scanning electron microscope comprises the following steps: (1) preparing a metallographic sample; 2) preparing a transmission electron microscope sample, and determining an area where the inclusion of the metallographic sample is located by using a scanning electron microscope; carrying out accurate positioning and in-situ micro-nano thinning and cutting on the area where the inclusion of the metallographic sample is located by using a focused ion beam double-beam electron microscope system, and extracting the superfine non-metallic inclusion; and 3) analyzing the ultrafine non-metallic inclusions in the transmission electron microscope sample, and detecting the grain orientation of the ultrafine inclusions by using a transmission-type electron back scattering diffractometer. The method provided by the invention can accurately identify and extract the superfine non-metallic inclusions and the phase composition, components and grain orientation thereof in situ.
Owner:SHANGHAI MEISHAN IRON & STEEL CO LTD

Method for displaying and observing aggregated niobium compound causing layering and cracking of wheel steel

The invention discloses a method for displaying and observing aggregated niobium compounds causing stretching layering cracking of wheel steel. The method comprises the steps of sampling, grinding, low-power defect display, stripping, inlaying, grinding, polishing, corrosion, scanning electron microscope observation and phase component and element atomic ratio determination through an energy disperse spectroscopy. According to the method, the periphery is ground after sampling, then the segregation defect is displayed through corrosion of a low-power corrosive liquid, the sample is stripped off from the position 0.5-1 mm away from a segregation defect line through linear cutting, hot inlaying is conducted, and after grinding, polishing and corrosion are conducted, the shape, size and distribution of aggregated and distributed niobium compounds can be clearly displayed under a scanning electron microscope; and the components and atomic ratio of the phase can be determined by using an energy disperse spectroscopy.
Owner:TANGSHAN IRON & STEEL GROUP +2

High-b-value linear ntc thermistor material with good batch consistency, preparation method thereof and thermistor element

The application provides a high-B-value linear NTC thermistor material with good batch consistency, a preparation method thereof and a thermistor element, relates to the technical field of NTC thermistor materials, and is characterized in that a NiO-ZnO binary oxide system is selected, ZnO is used as a main crystal phase, the conductive behavior and resistance-temperature characteristics of the material are controlled through a small amount of NiO, a NiO-ZnO linear NTC thermistor material directly physically compounded by NiO and ZnO is formed, the system composition is more simplified, the composite path is shorter, the phase composition is more easily controlled, the composition fluctuation and the organization non-uniformity caused by the complex second phase generation process, the insufficient local reaction or the uneven phase distribution can be reduced, and therefore the performance dispersion between different batches is reduced, and the consistency and the repeatability of the material preparation are improved.
Owner:HELAN MOUNTAIN LABORATORY +2

Method for preparing high-strength high-conductivity nano-heterostructure copper-chromium-zirconium alloy by multi-stage deformation and multi-stage aging

ActiveCN116083827BZr alloyPhase composition
The application belongs to the technical field of non-ferrous metal materials, and particularly discloses a method for preparing high-strength and high-conductivity nano-heterostructure copper-chromium-zirconium alloy through multi-stage deformation and multi-stage aging. The copper-chromium-zirconium alloy has a composition by mass percentage of Cr: 0.5wt%-1.0wt%, Zr: 0.05wt%-0.1wt%, and the balance being copper. The method obtains a new microstructure structure, i.e. a composite structure composed of nano-crystal, nano-twin crystal, nano-precipitated phase and grown micro-precipitated phase. The nano-crystal matrix has a certain component of nano-twin crystal, and is uniformly and diffusely distributed with nano-precipitated phase and part of grown precipitated phase. The new type of copper alloy has a tensile strength of 750MPa-850MPa and an electric conductivity of 75%-80% IACS, and can meet the demand of the electrical and power industries for high-performance copper-chromium-zirconium alloy.
Owner:CHANGZHOU UNIV

Micro-scale analysis method for structural composition of oxide on surface of reinforcing steel bar

The invention relates to the technical field of material analysis, and discloses a reinforcing steel bar surface oxide structure composition microscale analysis method, which comprises the following steps: obtaining a high-fidelity sample through a layered inert protection sample preparation technology, and sequentially analyzing oxide microstructure and element distribution by adopting a scanning electron microscope-energy spectrum coupling technology, atomic-scale crystal defect observation is realized by combining a spherical aberration correction transmission electron microscope, macroscopic phase composition and microcell chemical valence information are respectively acquired synchronously through X-ray diffraction and X-ray photoelectron spectroscopy, and finally a cross-scale correlation model covering morphological characteristics, crystal structures, phase distribution and chemical states is constructed through multi-source data fusion. And micro-scale structure analysis is realized. Through combination of a multi-source characterization technology, steel bar oxide cross-scale analysis is realized, a high-fidelity sample preparation technology is adopted to guarantee an original state of a sample, a chloride ion diffusion quantitative model fused with crystal defect parameters is constructed, and rust layer protection evaluation is improved from qualitative observation to quantitative prediction.
Owner:HENAN ACADEMY OF SCI CHEM RES INST CO LTD

Component-induced high-degree-of-freedom heterostructure metal material and preparation method thereof

The invention discloses a component-induced high-degree-of-freedom heterostructure metal material and a preparation method thereof, and belongs to the field of advanced structure metal materials. According to the method, space geometry, microstructures and phase composition characteristics of a hard area and a soft area are designed in advance through machine learning, phase induction elements are selected according to the space geometry, the microstructures and the phase composition characteristics, and stirring friction alloying parameters of corresponding areas are determined through thermodynamic calculation and an empirical formula. And finally, high-precision manufacturing of the target structure is achieved by planning an adding position and a tool moving path. The method gets rid of the dependence of a traditional preparation process on overall uniform processing, realizes multi-scale and customizable construction of a heterostructure from a macrostructure to a microstructure, and provides a brand new design idea for high-performance metal materials required by high-end equipment.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY

A laser measurement method for microscopic mechanical properties of material constituent phases

This invention relates to a laser measurement method for the microscopic mechanical properties of a material's constituent phases, comprising the following steps: (1) determining the constituent phases of the metallic structural material to be tested; (2) establishing a system of two linear equations based on the mathematical relationship between the overall deformation depth of the metallic structural material surface and the phase content of the constituent phases under different phase content ratios, and obtaining the overall deformation depth of different constituent phases under the action of a pulsed laser beam; (3) determining the microscopic mechanical properties of different constituent phases. This invention provides a green laser measurement and characterization method for the different mechanical properties of the internal phase composition of structural materials, which is applicable to a wider range of occasions and requires lower surface finish of the material to be tested. The material constituent phase measurement method provided by this invention establishes a more direct correspondence between the microscopic and macroscopic mechanical properties of materials, laying an experimental foundation for technicians to more thoroughly understand the quantitative relationship between material structure and properties.
Owner:SHANDONG UNIV

Titanium alloy microstructure regulation method and application thereof in medical implant field

This invention relates to the field of additive manufacturing technology, and provides a method for controlling the microstructure of titanium alloys and its application in the field of medical implants. Pure Mo particles with an average particle size of 10 micrometers, pure Mo particles with an average particle size of 30 micrometers, and Ti6Al4V alloy powder with a particle size range of 15-53 micrometers are selected as raw materials. Powders of different masses from Si are uniformly mixed for at least 5 hours. A dense Ti6Al4V alloy is prepared by optimizing process parameters. Ti6Al4V alloys with α+β dual-phase microstructures with different β-phase contents are prepared. The β-phase content in the formed sample is controlled by changing the overall content of Mo powder. The beneficial effect is that adding Mo powder to control the phase composition of laser powder bed molten Ti6Al4V alloy can achieve the transformation from a completely α-phase to a completely β-phase in the laser powder bed molten Ti6Al4V alloy.
Owner:SHANDONG UNIV

A low-loss high-curie-point bismuth titanate-barium titanate lead-free piezoelectric ceramic material and a preparation method thereof

The application discloses a low-loss high-Curie-point bismuth ferrite-barium titanate lead-free piezoelectric ceramic material and a preparation method thereof. 1.02 FeO3-(0.25-x)BaTiO3-xCaZrO3+y%GeO2+z%MnO2; wherein x, y and z represent molar fractions, 0.005<=x<=0.020, 0.3<=y<=1, 0.5<=z<=1.5. The application introduces the third component CaZrO3, and adds GeO2 and MnO2, controls the crystal phase composition and the conductive carrier concentration, improves the microstructure, reduces the loss and improves the temperature stability, so that the Curie temperature, the depolarization temperature and the piezoelectricity are obviously improved. The lead-free piezoelectric ceramic material provided by the application has a simple synthesis process, and is expected to be applied to the preparation of high-temperature piezoelectric sensor devices.
Owner:SOUTH CHINA UNIV OF TECH

A MoNbZr / Zr nano-layered material and preparation method thereof

The invention discloses a MoNbZr / Zr nano-layered material and a preparation method thereof. The MoNbZr / Zr nano-layered material is prepared by depositing on a clean silicon substrate by a magnetron sputtering deposition method. Ar+ ions bombard a target material to cause elastic collisions with MoNbZr / Zr atoms, further generating a collision cascade, whereby the sample atoms are excited and reversely deposited onto the substrate. MoNbZr atoms and Zr atoms are deposited in sequence to alternately form multilayer nano-layered materials with different modulation periods, different interface structures, and different phase compositions. High-density plasmas such as secondary electrons generated by sputtering circulate in the form of cycloids under the combined action of mutually perpendicular electromagnetic fields, and do not contact the substrate. Therefore, the ionization efficiency is high and the deposition rate is fast. The invention not only successfully prepares nano-layered materials with different phase compositions, but also the obtained nano-layered materials are uniform and dense, with clear interface structures and excellent comprehensive performance.
Owner:XI AN JIAOTONG UNIV

Cr2Se3 single crystal and preparation method thereof

The invention provides a Cr2Se3 single crystal and a preparation method thereof, and relates to the technical field of crystal materials. According to the preparation method of the Cr2Se3 single crystal, the steps from raw material proportioning, cooked powder preparation to the single crystal growth process cooperate to inhibit impurity introduction and impurity phase generation, meanwhile, ordered arrangement of atoms is promoted, lattice vacancy and dislocation are eliminated, and the Cr2Se3 single crystal good in single-phase property, high in crystallinity and extremely low in defect density is prepared. Due to the high-purity and low-defect single-crystal structure, the semiconductor transport characteristic and antiferromagnetic orderliness of the single-crystal structure are guaranteed; meanwhile, interference of impurity scattering and lattice distortion is eliminated, the regulation and control effect of a magnetic field on the Cr atom magnetic moment is optimized, and the single crystal has the strong CMR effect close to-100%. And through cooperation of all the steps, it is ensured that the prepared Cr2Se3 single crystals are consistent in size, phase composition and structural integrity, and the preparation success rate and the controllability and repeatability of the process are greatly improved.
Owner:NINGBO UNIV

Preparation method of lunar soil simulation with controllable components based on thermal phase change

ActiveCN121521575BRealize Quantitative ControlSolve the problem of inability to carry out component factor experimental designPreparing sample for investigationTest designLunar soil
The application discloses a component-controllable simulated moon soil preparation method based on thermal phase change and belongs to the technical field of moon soil simulation material preparation.The application realizes controllable adjustment of the content of main mineral phases (plagioclase, pyroxene, olivine and amorphous phase) through thermal melting and crystallization processes, and determines the mixing ratio in combination with a nonlinear programming model, so that the simulated moon soil is highly similar to the target moon soil in terms of mineral phase composition, microstructure, optical performance and thermal performance.The method provides a high-fidelity simulation material with adjustable components for the ground experiment of ISRU technology (such as sintering, metallurgy and in-situ 3D printing), and solves the problem that the traditional simulation material preparation method cannot perform fine component factor test design in the related technical research process.
Owner:HARBIN INST OF TECH

Preparation method of micron-flower-shaped 1T / 2H phase molybdenum disulfide wave-absorbing material

The application relates to a preparation method of a micron-flower-shaped 1T / 2H phase molybdenum disulfide wave-absorbing material, and belongs to the technical field of electromagnetic wave absorbing material preparation. The application aims to solve the technical problems of unclear dielectric regulation mechanism of transition metal sulfide wave-absorbing material, narrow electromagnetic wave absorption band and weak absorption intensity. The method comprises the following steps: synthesizing high-purity 1T-MoS2 by a hydrothermal method; and gradually converting the phase composition of MoS2 from 1T phase to 2H phase by controlling the heat treatment temperature and time. The application utilizes the huge difference in dielectric properties and stability between the two phases of MoS2 to enhance the wave-absorbing performance. Compared with the prior art, the material preparation process is simple, the raw material cost is low, and the material can be produced on a large scale. Compared with other pure TMDs wave-absorbing materials, the composite wave-absorbing material has the characteristics of light weight, strong absorption, wide frequency band and thin matching thickness. The micron-flower-shaped 1T / 2H phase molybdenum disulfide wave-absorbing material prepared by the method can be applied to the field of electromagnetic wave absorbing materials.
Owner:HARBIN INST OF TECH

Sample preparation method and device for XRD (X-Ray Diffraction) test of microcell phase components

The invention discloses a sample preparation method for XRD (X-Ray Diffraction) test of microcell phase components, and belongs to the technical field of XRD phase component detection. A surface to be detected of a sample to be detected is covered with a selected covering, and then after the covering at a region to be detected of the sample to be detected is etched, only the region to be detected of the sample to be detected is exposed. Therefore, when the X-ray diffractometer is adopted to test the phase composition of the to-be-tested area, the to-be-tested surface outside the to-be-tested area has no diffraction peak or is not completely overlapped with the diffraction peak of the to-be-tested area, so that the diffraction peak spectrum of the micron-sized to-be-tested area can be obtained. According to the method disclosed by the invention, the XRD detection of the phase components of the micron-sized to-be-detected region is not limited by a measurement mode or an instrument hardware condition.
Owner:XIAMEN TUNGSTEN CO LTD

Device for measuring Young modulus of polybutylene-1

The invention discloses a device for measuring Young modulus of polybutylene-1, which belongs to the technical field of Young modulus measurement and has the measurement principle that the average T2 relaxation rate and Young modulus of the polybutylene-1 have good correlation. According to the measuring device, the Young modulus of a series of polybutylene-1 with different structures at different temperatures can be quickly obtained by utilizing the relationship. The method comprises the following steps: respectively measuring a stress-strain curve and a T2 relaxation curve of a polybutylene-1 sample in different states by using a stretching instrument and a low-field solid nuclear magnetic resonance spectrometer, obtaining Young modulus and a corresponding average T2 relaxation rate by using a corresponding program, and obtaining a linear function corresponding to the Young modulus and the average T2 relaxation rate; after the linear function is obtained, the Young modulus does not need to be obtained by repeatedly carrying out stretching detection on a sample through a stretching instrument like a traditional method, only the corresponding T2 relaxation time and phase composition need to be measured through a low-field solid nuclear magnetic resonance spectrometer, and then the Young modulus of polybutylene-1 in different states can be obtained by substituting the relaxation time and the phase composition into the function for calculation.
Owner:INST OF MATERIALS HENAN ACAD OF SCI

Sparse reconstruction method and system of X-ray diffraction spectrum based on dynamic dictionary

The present invention discloses a method and system for sparse reconstruction of X-ray diffraction spectra based on a dynamic dictionary. The method generates an initial dictionary, dynamically optimizes and updates the dictionary, and obtains a sparse dictionary. Based on the sparse dictionary, a subset of X-ray diffraction scanning angles is selected, an observation matrix is ​​constructed, the observation process is encoded, and compressed sampled X-ray diffraction projection data is obtained. Sparse vectors are obtained from the obtained compressed sampled X-ray diffraction projection data to obtain a reconstructed spectrum. The accuracy of the sparse representation is improved. The present invention provides a high-throughput XRD material spectrum analysis method that combines dynamic dictionary learning, compressed sensing theory, and deep learning, aiming to improve the efficiency and accuracy of crystal structure identification and phase composition analysis in new material research and development.
Owner:CHANGSHU INSTITUTE OF TECHNOLOGY

A large-size ETA phase-strengthened superalloy and its preparation method

The present invention discloses a large-sized ETA-phase strengthened superalloy and a preparation method thereof, aiming to improve the high-temperature resistance of the alloy. To this end, on the one hand, the large-sized ETA-phase strengthened superalloy provided by an embodiment of the present invention, in terms of phase composition, the superalloy includes a matrix, γ' phase and η phase; wherein, the grain size of the matrix is 10-30 μm, the γ' phase is dispersedly distributed in the matrix, the η phase is uniformly distributed in the matrix, the distribution form of the η phase is divided into needle-shaped and sheet-shaped, the average length of the η phase is 30-50 μm, and the size of the γ' phase is 30-200 nm.
Owner:CENT SOUTH UNIV

Methods for determining a temperature achieved by a heating process

A method for determining a temperature achieved on a substrate by a heating process includes receiving the substrate including a metal containing layer disposed over a first layer, the metal containing layer including a metal, the first layer including a first material different from the metal containing layer, and performing the heating process to heat the substrate using a pulsed laser. The method further includes, after performing the heating process, determining a phase composition of the metal containing layer and a material composition of the metal containing layer using a diffraction technique. And the method further includes, using the phase composition and the material composition of the metal containing layer, determining the temperature of the substrate achieved by the heating process.
Owner:TOKYO ELECTRON LTD

A triclinic nepheline glass-ceramic and a preparation method and application thereof

ActiveCN118954955BCrystallinityNepheline
The application relates to the technical field of glass ceramics, and discloses a tri-clinic nepheline glass ceramic as well as a preparation method and application thereof. The glass ceramic comprises the following components in terms of molar percentage: 43-58 mol% SiO2, 15-27 mol% Al2O3, 20-30 mol% Na2O, 0-10 mol% Li2O, 0-10 mol% K2O, 0-5 mol% P2O5 and 0-3 mol% ZrO2. The glass ceramic provided by the application has a crystallinity of more than 80%, a crystal size of less than 90 nm, an average transmittance of more than 90% in a visible light band, and a crystal phase composition containing only a main crystal phase tri-clinic nepheline phase or containing a secondary crystal phase nepheline phase and a phosphate phase. The reduction or removal of the phosphate phase in the crystal phase improves the chemical stability of the glass ceramic and enables chemical strengthening.
Owner:WUHAN UNIV OF TECH

Glass ceramic article, method for producing same, and use thereof

Sheet-like glass ceramic article are provided that include surfaces with a thickness between the surfaces between 0.5 mm and 1.9 mm and a core. The articles have a first microstructure provided on each of the surfaces and have a second microstructure in the core with a second thickness (d2). The first microstructures extend inwardly from the surfaces towards the core and has a first thickness (d1). The first microstructure has a difference from the second microstructure selected from a group consisting of: a crystalline phase type, a crystalline phase amount, crystalline phase size distribution, crystalline phase orientation, crystalline phases composition, crystalline inclusion, an amorphous phase type, an amorphous phase percentage amount, an amorphous phase composition, and any combinations thereof. The difference results in a first coefficient of linear thermal expansion of the first microstructure that is smaller than a second coefficient of linear thermal expansion of the second microstructure.
Owner:SCHOTT AG

Ag-cu-pd quaternary metal brazing filler and design method thereof

PendingCN122369725ACopperPalladium
This invention discloses an Ag-Cu-Pd quaternary metal solder and its design method. The method includes: constructing Gibbs energy models for each phase in the quaternary metal system and obtaining a database for predicting solidification paths, phase composition, and phase transition temperatures; setting the silver-copper ratio and palladium content in the quaternary metal system, using the remaining metal as a control variable, calculating equilibrium solidification through the database, and obtaining the melting temperature and melting range of the quaternary metal system; matching the melting characteristics with the target solder based on the melting temperature and melting range, and obtaining the as-cast and service microstructures of the quaternary metal system within the matching range, then matching the microstructure and phase composition with the target solder, using the lowest cost as a constraint, to obtain the final quaternary metal solder composition. Compared with the corresponding target solder, the solder obtained by this method reduces palladium usage by approximately 8-25%, reduces costs by 7.30-17.64%, and maintains the same key process performance, achieving an economical substitution of precious metal solders.
Owner:CENT SOUTH UNIV

Ca-based low dielectric microwave dielectric ceramic and preparation method thereof

The application provides a Ca-based low-dielectric microwave dielectric ceramic and a preparation method thereof, which is prepared from a compound with a chemical formula of xCaO-yMO-zAl3O2-kNO2 (M is Mg or Zn; N is Si or Ge), and the main crystal phase of the compound has a chemical formula of Ca4MAl2N3O 14 (M is Mg or Zn; N is Si or Ge). The Ca-based low-dielectric microwave dielectric ceramic prepared by the above method overcomes the defects in the synthesis of low-dielectric microwave dielectric ceramics in the prior art, has the characteristics of low dielectric constant and high quality factor, has the advantages of simple synthesis process and stable main crystal phase composition, and is a low-dielectric microwave dielectric ceramic material suitable for millimeter wave communication.
Owner:WUHAN TEXTILE UNIV

CoS2 / MoS2 composite material and synthesis method thereof

The invention provides a CoS2 / MoS2 composite material and a synthesis method thereof, the CoS2 / MoS2 composite material is prepared by combining a solvothermal method, a room-temperature stirring method and a hydrothermal vulcanization method, the CoS2 / MoS2 composite material is rod-like MoS2 with CoS2 particles loaded on the surface, a unique reaction system is innovatively constructed, a crystal growth kinetic process is controlled, and the CoS2 / MoS2 composite material is prepared. According to the present invention, the CoS2 / MoS2 rod-like structure phase composition and the microscopic morphology can be accurately controlled, the far-reaching scientific theoretical value is provided, the significant practical application significance is provided, and the synthesis method further has advantages of easy parameter control, good product morphology repeatability, high yield and the like, and is suitable for large-scale production.
Owner:SHANDONG ENERGY GRP CO LTD +1

A high-entropy rare-earth titanate ceramic coating material and its preparation method

The present invention relates to a high-entropy rare earth titanate ceramic coating material and a preparation method thereof, belonging to the technical field of high-entropy ceramic materials. The phase composition of the coating material is (La 0.3 K 0.1 Ca 0.2 Sr 0.2 Ba 0.2 )TiO 3+δ . The preparation method is to wet ball-mill and mix the raw material powders evenly to form a slurry, dry it, then heat it up to 900 °C to 1000 °C and keep it at a constant temperature for pre-calcination for 2 h to 3 h, cool it with the furnace, then heat it up to 1300 °C to 1400 °C and keep it at a constant temperature for calcination for 10 h to 15 h, and then cool it down to obtain the coating material. The coating material is successfully prepared into an ideal new high-entropy rare earth titanate ceramic coating material by the design addition of doping elements and by adjusting process parameters, which changes its crystal structure, microstructure and oxygen vacancy defect concentration, making the density of the coating bulk material greater than 98.4%, the Vickers hardness 10 GPa to 12 GPa, and the thermal conductivity 1.39 W·m ‑1 ·k ‑1 ~1.75 W·m ‑1 ·k ‑1 ; The process flow for preparing the coating material by the high-temperature solid-phase reaction method is simple, the preparation cost is low, and it is easy to promote.
Owner:ZHENGZHOU UNIV +1

Real-time crystal form control method and process control system for urapidil crystallization process

The invention relates to the technical field of pharmaceutical production workshops, in particular to a real-time crystal form control method and process control system for an urapidil crystallization process, and the method comprises the following steps: collecting spectral data of urapidil crystal slurry in a crystallization kettle in real time through a terahertz time-domain spectrometer; and analyzing by using a quantitative analysis model to obtain the real-time mass fraction of each crystal phase. And inputting the crystal form parameters into a process feedback control model, generating a control instruction according to a preset logic, and dynamically adjusting the process parameters such as the cooling rate and the stirring strength to form closed-loop feedback control. The system adopts an intelligent process unit design integrating a terahertz monitoring unit and a distributed control system. The method is suitable for modern pharmaceutical workshop design, and can realize online quantitative monitoring of phase composition in the urapidil crystallization process and automatic closed-loop control of process parameters, thereby eliminating inter-batch difference of product crystal forms.
Owner:GUANGDONG JINGHAO BIOPHARMACEUTICAL CO LTD

Crystal structure database-based material analysis method and system, and application

Disclosed are a material analysis method based on the crystal structure database, a system, a computer-readable storage medium and an application. The material analysis method includes comparing experimental pattern information obtained from examination of a to-be-tested sample with theoretical pattern information calculated from material structure data in the crystal structure database, and obtaining crystallographic information and phase composition of the to-be-tested sample through intelligent analysis. The crystallographic information include space group, unit cell parameter, and specific coordinates of atoms in unit cell. The crystal structure database has material structure data obtained by experimental measurement and / or theoretical prediction, including chemical formula, space group, unit cell parameter and specific coordinates of atoms in unit cell. Based on this method, large-scale high-throughput and high-precision material analysis can be achieved, laying the foundation for building a data mining and analysis platform for material patterns.
Owner:PEKING UNIV SHENZHEN GRADUATE SCHOOL

Alloy high-throughput preparation and characterization method

PendingCN122631397AHigh fluxNanoindentation
The application relates to an alloy high-flux preparation and characterization method, which comprises the following steps: preparing a first alloy rod material with a carbon content gradient in a radial direction; gradient heat treating the first alloy rod material, so that the first alloy rod material has a temperature gradient in the axial direction during the heat treatment process, and a second alloy rod material is obtained; cutting the second alloy rod material into a half cylinder along the carbon content gradient direction, performing Vickers hardness tests on different positions of the rectangular cross section of the half cylinder, and determining boundary conditions for one-dimensional steady-state heat conduction calculation and division of regions with different characteristic microstructures; and respectively adopting synchronous X-ray diffraction and high-speed nanoindentation tests to characterize phase compositions and phase characteristics of different positions of the rectangular cross section of the half cylinder. By adopting the above method, a UniSteel alloy composition-heat treatment process-microstructure-mechanical property relationship can be quickly established, and data support is provided for subsequent rapid screening of optimized alloy compositions (carbon contents) and heat treatment processes (isothermal holding temperatures), so that the work amount is greatly reduced, the research efficiency is improved, and the application has important significance.
Owner:SONGSHAN LAKE MATERIALS LAB

Rare earth sintered neodymium-iron-boron magnet, method for producing same and use of praseodymium hydride

The application discloses a rare earth sintered Nd-Fe-B magnet, a preparation method thereof and a use of praseodymium hydride. The rare earth sintered Nd-Fe-B magnet has an element composition of (R1, R2)-T-B-M; the rare earth sintered Nd-Fe-B magnet is composed of a sintered body containing main phase crystal grains and a grain boundary phase; the main phase crystal grains are composed of (R1, R2)2T 14 B phase; the Pr concentration C1 of the edge of the main phase crystal grains is higher than the Pr concentration C2 of the center of the main phase crystal grains; the R1 concentration of the grain boundary phase is higher than the R1 concentration of the main phase crystal grains; and the average thickness of the grain boundary phase is 20-60 nm. The coercive force and the remanence of the rare earth sintered Nd-Fe-B magnet reach a good balance.
Owner:BAOTOU TIANHE MAGNETICS TECH CO LTD

Method for calculating high-temperature elastic-plastic constitutive behavior and toughness characteristic of crystal-amorphous biphase metal based on deformation mechanism and microstructure composition

The invention discloses a method for calculating high-temperature elastic-plastic constitutive behaviors and toughness characteristics of crystal-amorphous double-phase metal based on a deformation mechanism and microstructure composition, which is based on an elastic-plastic theoretical framework, considers the deformation mechanism and the microstructure composition, realizes numerical calculation through MATLAB (matrix laboratory), and calculates the high-temperature elastic-plastic constitutive behaviors and toughness characteristics of the crystal-amorphous double-phase metal based on the deformation mechanism and the microstructure composition. And the high-temperature uniaxial stretching / compression elastic-plastic constitutive behavior and the toughness characteristic of the crystal-amorphous biphase metal are simulated and predicted. According to the method, microstructure characteristics such as metal internal grain size, dislocation density evolution, microcrack generation and evolution and amorphous integral number evolution along with temperature are considered, and high-temperature uniaxial tension / compression elastic-plastic constitutive behaviors and toughness characteristics of metal materials with microstructures composed of crystal phases and amorphous phases are simulated and predicted. In the preparation of a crystal-amorphous biphase metal material and a high-temperature mechanical property measurement experiment, a theoretical basis is provided for the high-temperature tensile / compressive property change of the crystal-amorphous biphase metal, and a theoretical guidance can be provided for improving the high-temperature mechanical property of the crystal-amorphous biphase metal.
Owner:ZHEJIANG UNIV