20 results about "Sphericity" patented technology

The invention relates to a powder sphericity detection method, relates to the technical field of powder property detection, and solves the problem of poor accuracy of an existing powder sphericity detection method. The detection method comprises the following steps: randomly extracting powder to be detected, and obtaining a contour descriptor of each powder particle; calculating a geometrical shape factor and a mesoscopic descriptor of each powder particle according to the contour descriptor of each powder particle; classifying the powder to be detected according to the section morphology of the powder particles, and counting the number of the powder particles in the powder with different section morphology types; according to the number of the powder particles in the powder of each section morphology type and the geometrical shape factor and the mesoscopic descriptor of each powder particle, calculating the average sphericity value of the powder of each section morphology type; and calculating the final sphericity degree of the powder to be measured based on the average sphericity degree value of the section morphology type powder. According to the invention, scientificity and accuracy of a powder sphericity detection result can be ensured.

The application discloses a kind of multi-dimensional evaluation and anchor point constraint scoring method of particle shape, belong to the technical field of particle shape analysis.The method includes: obtaining the three-dimensional grid model of particle sample and pre-processing;Extract the multi-dimensional shape features including corner angle, sphericity, size, symmetry, texture and taper;Filter key features by multi-model voting;Group key features according to preset dimension and carry out adaptive dimension reduction, construct multi-dimensional evaluation space;Determine anchor point sample set for each evaluation axis, construct two-classification sub-problems for the evaluation axis containing intermediate anchor point, determine initial scoring parameter using seven-model performance weighted integration;Based on the score relationship of low-end, intermediate and high-end anchor points, the initial parameter is corrected by ridge regression, and the final scoring parameter is obtained by sequential monotonicity check;Based on the final scoring parameter, the multi-dimensional score of the particle to be scored is carried out and the result is output.The application realizes the multi-dimensional automatic evaluation of particle shape, has the advantages of feature selection objectivity, weight distribution accuracy, intermediate morphological particle position rationality, dimension reduction method adaptivity, visualization richness and the like.

The application relates to the field of soft magnetic material preparation, and particularly discloses a centrifugal atomization method and system for preparing superfine soft magnetic powder. The method comprises the following steps: controlling the superheat degree of a Fe-Si-Al alloy melt, injecting the melt into a high-speed centrifugal atomizer through a laser texturing centrifugal disc to generate refined liquid drops; controlling the atmosphere and performing multi-stage cooling under a specific hydrogen proportion and a low-oxygen environment; preparing the powder through ultrasonic-assisted rapid cooling and solidification; adopting an intelligent algorithm and multi-stage separation to accurately classify the particle size; detecting the morphology, oxygen content and magnetic performance of the powder to screen qualified products; and finally realizing process optimization through equipment deviation analysis and system calibration. The method can accurately control the particle size distribution of the powder, effectively reduce the oxygen content, and significantly improve the sphericity and soft magnetic performance of the powder.

The application relates to a powder sphericity detection method and relates to the technical field of powder property detection, and solves the problem of poor accuracy of the existing powder sphericity detection method. The detection method comprises the following steps: randomly extracting a powder to be detected, and obtaining a contour descriptor of each powder particle; calculating a geometric shape factor and a mesoscopic descriptor of each powder particle according to the contour descriptor of each powder particle; classifying the powder to be detected according to the cross-section morphology of the powder particles, and counting the number of powder particles in different cross-section morphology types of powder; calculating the average sphericity value of each cross-section morphology type of powder according to the number of powder particles in each cross-section morphology type of powder and the geometric shape factor and the mesoscopic descriptor of each powder particle; and calculating the final sphericity of the powder to be detected based on the average sphericity value of the cross-section morphology type of powder. The application can guarantee the scientificity and accuracy of the powder sphericity detection result.

The invention discloses a method for mechanically shaping superfine powder, and relates to the preparation field of particle size control and morphology control of glass superfine powder, and the method comprises the following steps: 1, conveying a primarily crushed powder raw material into a multi-stage turbo-type shaping cavity which is composed of a fixed wall and a high-speed rotor, and the high-speed rotor is provided with a shaping medium; 2, synchronously applying an impact, shearing and rolling composite force field; 3, treating for 5-30 minutes in a low-temperature environment from-50 DEG C to normal temperature; 4, monitoring the sphericity degree and the particle size distribution of the powder in real time through an online particle image analyzer; 5, collecting the sphericity gt through a cyclone separator; and 0.95 of the superfine powder finished product is obtained. The sphericity gt of the powder is produced; 0.95, the surface roughness is Rat; the sphericity degree of the traditional ball milling process is generally 1t; and 0.75, microcracks generated by impact crushing are avoided through the synergistic effect of shearing and rolling.

A tantalum-tungsten alloy product and a preparation method therefor where the method comprises: (1) providing spherical tantalum-tungsten alloy powder, wherein the powder is characterized in that the lower limit of the particle size is 15 μm-25 μm, the upper limit of the particle size is 50 μm-60 μm, the time for 50 g of the powder to pass through a standard funnel is 5-10 seconds, the sphericity of the powder is greater than or equal to 0.8, the hollow particle ratio of the powder is less than or equal to 5%, and the apparent density is 9-11 g / cm3; (2) processing and molding the powder by using a 3D printing process to obtain a printed blank; (3) performing printing post-treatment on the blank; and (4) performing vacuum heat treatment on a product from step (3), wherein the temperature of the heat treatment is 1350° C. to 1750° C., and the time is 30-90 minutes.

The invention discloses a method and a device for preparing silicon nitride ceramic balls by a slope rolling titration method. According to the slope rolling titration balling device, a slope rolling method is creatively adopted, the influence of gravity on the sphericity degree of liquid drops is reduced, and silicon nitride green balls with ultrahigh roundness can be obtained; and the problems that a compact core part cannot be obtained due to low-density rolling forming of the silicon nitride powder, the ball is not round due to traditional direct titration, and the small balls cannot be produced in quantity and are provided with indentations due to compression forming are fundamentally solved.

The application relates to the field of amorphous alloy materials, in particular to a high-sphericity amorphous soft magnetic alloy powder and a preparation method thereof, the structural general formula of which is as follows: (Fe 0.65 Ni 0.1 Si 0.1 Mo 0.05 Cu 0.09 P 0.01 ) 100‑x (A a B 1‑a ) x , wherein A and B are the same or different and are selected from rare metals; when A and B are the same, a is 0; when A and B are different, a is 0.1-0.5; and x is 1-5; the amorphous soft magnetic alloy has a saturation magnetization intensity of greater than or equal to 172.7 A.m 2 / kg, a coercive force of only 28.4 A / m, can meet the application requirements of an iron loss Pc < 800 mW / cm m under the test conditions of 100 kHz and B 3 = 100 mT, and has excellent comprehensive soft magnetic performance with a magnetic permeability reduction of less than or equal to 30% under the condition of 100 Oe direct current superposition.

The utility model provides a standard ball rod for measuring error calibration of a phase type laser radar measuring system. The standard ball rod comprises two standard balls and a connecting rod, the two standard balls are fixedly connected to the two ends of the connecting rod; the length of the distance between the ball centers is 1-1.5 m, the diameter of the two standard balls is 100-150 mm, and the sphericity of the two standard balls is 2-5 microns. According to the standard ball rod for calibrating the measuring error of the phase type laser radar measuring system, the measuring error of the phase type laser radar measuring system can be accurately calibrated. According to the measurement method, a series of problems such as feeding the phase type laser radar into a laboratory or moving laboratory equipment into a plant are avoided, and the method has the characteristics of simplicity in operation, high universality, high measurement accuracy and reliability in work.

The invention discloses a simulation method based on a crystal plasticity finite element coupling irradiation effect and damage, and the method comprises the specific steps: S1, building a three-dimensional polycrystalline model with controllable grain size and sphericity based on electron back scattering diffraction (EBSD) experimental data; s2, constructing a crystal plastic model coupled with dislocation density evolution, distinguishing movable and immovable dislocation densities, and correcting a slip resistance formula; s3, introducing an irradiation-induced dislocation loop term into the crystal plastic model to add an irradiation effect in the slip resistance and dislocation evolution equation of the crystal plastic model, and coupling the maximum shear strain damage factor to a flow equation of the crystal plastic model; s4, a crystal plastic model is achieved through a UMAT subprogram, periodic boundary conditions are applied to the three-dimensional polycrystalline model to execute uniaxial stretching simulation, and a stress-strain curve is output through volume averaging on the basis of the crystal plastic model. The method can accurately predict the tensile properties of the nuclear power steel before and after irradiation, and has the advantages of clear physical significance, high calculation efficiency and the like.

The invention provides a sphericity error evaluation method based on a cone search algorithm. The method comprises the following steps: A, sampling to obtain coordinates of a collection point; calculating a least square ball center coordinate based on the acquisition point coordinate, and then calculating to obtain a least square ball error; b, constructing an auxiliary ball, determining coordinates of search points of the auxiliary ball, calculating the distance from each collection point to the search points, and solving a range value between the maximum distance and the minimum distance; searching point coordinates corresponding to the minimum value and the second minimum value in the range values are found; c, constructing a cone model, obtaining a cone search point, and calculating a quasi-sphere center coordinate; d, calculating a sphericity error f1 value and a sphere center coordinate of a '3 + 2 'structural form of a minimum containing area method based on the quasi sphere center coordinate; e, calculating a sphericity error f2 value and a sphere center coordinate in a '2 + 3' structural form based on a quasi sphere center coordinate calculation method; and F, comparing the f1 value with the f2 value, and outputting a minimum value of the f1 value and the f2 value as a sphericity error evaluation result. According to the method, the sphericity error evaluation efficiency and precision can be remarkably improved.

The invention provides a manufacturing method of an erosion-resistant nozzle, the nozzle is manufactured by using a hard alloy material through a laser powder bed melting process, and the specific technical scheme is as follows: WC-Co type spherical hard alloy powder is selected as a raw material, the content of Co in percentage by weight is 6%-20%, the fluidity of the powder exceeds 9.25 s / 50g, the apparent density is greater than 6.83 g / cm < 3 >, and the powder is prepared into a spherical hard alloy material; the spheroidization rate is greater than 99%, and the average sphericity of the powder is greater than 99%; in the printing process parameters, the thickness of a powder laying layer is 0.01-0.045 mm; the value range of the linear energy density of the laser is 0.3 J / mm to 0.8 J / mm; the scanning distance ranges from 0.01 mm to 0.15 mm; and the scanning path strategy is that the layers are alternately staggered by 67 degrees. The coal water slurry nozzle effectively solves the prominent problems that a traditional coal water slurry nozzle is serious in erosive wear, short in service life and the like. According to the additive manufacturing method, the advancement of the 3D printing technology and the excellent performance of the hard alloy powder are fused, so that a more efficient and economical nozzle manufacturing mode is provided, and the performance of the nozzle is remarkably improved.

This invention belongs to the field of metallic materials technology, specifically a single-phase TiZrMo spherical refractory high-entropy alloy powder and its preparation method. The refractory high-entropy alloy powder is composed of any two of Al, Cr, and Nb, and Ti, Zr, and Mo. The atomic radius difference of the refractory high-entropy alloy powder is ≤6.5%, the alloy entropy enthalpy ratio Ω is ≥1.4, and the mixing enthalpy ΔH is... mix The energy density is -20.27 to -3.27 kJ / mol, and the vacancy electron concentration (VEC) is <4.96. Furthermore, the preparation method of this invention has the advantages of simple steps, easy composition control, high production efficiency, and near-net-shape forming. The prepared spherical single-phase BCC refractory high-entropy alloy powder has a high sphericity, smooth surface, and low cost. The high-entropy alloy bulk prepared from this powder has stable microstructure and properties, and its density (2.70–10.22 g / cm³) can be adjusted within a wide range. 3 It possesses both good plasticity (compressive fracture strain ≥10.0%) and strength (compressive strength ≥965MPa), making it suitable for large-scale industrial applications.

The present invention relates to a foamed bead having a foam structure, a method for producing such a bead, and a method for producing a molded component using the bead. The present invention relates to a foamed bead having a foam structure, the foamed bead having a spherical shape defined by a sphericity φ of more than 0.94 and less than 1.00, and having an angle of repose value of 31.0°-50.0° as measured in accordance with ISO 4324.

The application discloses a kind of cerium-rich R-T-B series sintered magnets and preparation method thereof, the preparation method includes the following steps: S1, preparation mixed powder, the mixed powder is obtained by the first R-T-B series alloy powder of cerium-rich rare earth and the second R-T-B series alloy powder of cerium-poor rare earth is mixed uniformly, wherein, the sphericity of the first R-T-B series alloy powder is not less than 0.75;S2, mixed powder is prepared into R-T-B series sintered magnet.The preparation method constructs the grain shell layer of low Ce content in the interior of cerium-rich R-T-B series sintered magnet, to improve the intrinsic coercivity of cerium-rich R-T-B series sintered magnet.By the preparation method of the application, high-performance R-T-B series sintered magnet rich in Ce element can be prepared, and the application of Ce resources in R-T-B series sintered magnet is promoted.

This disclosure provides a steel sheet with excellent hardenability and excellent cold workability. The steel sheet disclosed herein has the following composition by mass %: C: 0.15~0.50%, Si: 0.01~0.50%, Mn: 0.20~1.30%, P: less than 0.100%, S: less than 0.100%, Al: less than 0.100%, Cr: 0.01~1.20%, N: less than 0.0150%, and the balance being Fe and impurities. The total surface area of ​​ferrite and cementite particles is 95% or more, the average grain size of ferrite is 5.0~20.0 μm, and the Cr concentration in the cementite particles is [Cr]. θ and Mo concentration [Mo] θ To satisfy equation (1), the average particle size of the cementite particles is less than 1.50 μm, the sphericity of the cementite particles is greater than 85%, and the dispersion DI of the number of cementite particles in a small square partition with a side length of 10 μm, as defined by equation (2), is less than 45%. 2[Cr] θ +3[Mo] θ ≤3 / √C (1) DI=σ θ / N θ ×100 (2)

The invention provides a spherical alumina material and a preparation method thereof.The spherical alumina material comprises rare earth oxide, silicon dioxide and alpha-alumina, the mass of the rare earth oxide and the mass of the silicon dioxide account for 0.05%-0.5% of the mass of the spherical alumina material, the rare earth oxide comprises at least one of Sc2O3, Y2O3, La2O3, Nd2O3, Gd2O3, Lu2O3 and Dy2O3, the alpha-alumina comprises alpha-alumina, and the rare earth oxide comprises at least one of Sc2O3, Y2O3, La2O3, Nd2O3, Gd2O3, Lu2O3 and Dy2O3. The D50 average particle size of the alpha-alumina is 0.8-2 [mu] m, the sphericity degree is not less than 0.95, and the specific surface area is 5-15 m < 2 > / g. The average particle size of the alpha-alumina D50 is 0.8-2 [mu] m, the sphericity degree is not lower than 0.95, the specific surface area is 5-15 m < 2 > / g, and the requirement of the electronic heat conduction market for spherical alumina powder can be met.

The present application relates to the technical field of numerical simulation analysis, and particularly relates to a typical structure identification method, device, equipment, storage medium and program product. The method comprises the following steps: obtaining a three-dimensional particle point set of a target to be identified, and calculating porosity, directional eigenvalue, overall linearity, overall flatness and sphericity based on the three-dimensional particle point set; determining whether the target to be identified belongs to a first typical category set, a second typical category set or a third typical category set based on the porosity; when the target to be identified belongs to the first typical category set, identifying the typical structure of the target to be identified based on the porosity; when the target to be identified belongs to the second typical category set, identifying the typical structure of the target to be identified based on the sphericity; and when the target to be identified belongs to the third typical category set, identifying the typical structure of the target to be identified based on the directional eigenvalue, the overall linearity and the overall flatness. The method can effectively improve the efficiency of structure type identification and space debris impact spacecraft risk simulation evaluation.

Provided is a wire bonding method that makes it possible to use a bonding wire in which a coating layer containing Au as a main component is provided on the surface of a core material containing Ag as a main component, to form, in the atmosphere, an FAB that has a high sphericity and thus has a favorable shape. The wire bonding method comprises a ball formation step for generating discharges between the distal end portion of a bonding wire W and a discharge electrode, to form a ball in the distal end portion of the bonding wire. The ball formation step of the wire bonding method includes a melting step for generating a first discharge between the distal end portion of the bonding wire W and a discharge electrode 51 to melt the distal end portion of the bonding wire W with a first discharge current in the first discharge, thereby generating a molten wire, and a slow-cooling step for generating a second discharge between the distal end portion of the bonding wire W and the discharge electrode until the molten wire generated in the melting step at least re-solidifies, to supply, between the distal end portion of the bonding wire W and the discharge electrode 51, a second discharge current that has a current value that gradually decreases in the range of not greater than the current value of the first discharge current.

The invention relates to the technical field of numerical simulation analysis, in particular to a typical structure identification method, device and equipment, a storage medium and a program product. Comprising the following steps: acquiring a three-dimensional particle point set of a to-be-identified target, and calculating porosity, a direction characteristic value, overall linearity, overall flatness and spherical degree based on the three-dimensional particle point set; judging whether the to-be-identified target belongs to a first typical category set, a second typical category set or a third typical category set based on the porosity; when the to-be-identified target belongs to the first typical category set, identifying the typical structure of the to-be-identified target based on the porosity; when the to-be-recognized target belongs to the second typical category set, recognizing the typical structure of the to-be-recognized target based on the sphericity; and when the to-be-identified target belongs to the third typical category set, the typical structure of the to-be-identified target is identified based on the direction characteristic value, the overall linearity and the overall flatness, and the efficiency of structure type identification and space debris impact spacecraft risk simulation evaluation can be effectively improved.