328 results about "Grain distribution" patented technology

A horizontal magnetic recording medium that has as its magnetic film a granular film with grains of a chemically-ordered FePt or FePtX (or CoPt or CoPtX) alloy in the tetragonal L10 structure uses an etched seed layer beneath the granular film. The granular magnetic film reveals a very high magnetocrystalline anisotropy within the individual grains. The film is produced by sputtering from a single alloy target or cosputtering from several targets. The granular structure and the chemical ordering are controlled by means of sputter parameters, e.g., temperature and deposition rate, and by the use of the etched seed layer that provides a structure for the subsequently sputter-deposited granular magnetic film. The structure of the seed layer is obtained by sputter etching, plasma etching, ion irradiation, or laser irradiation. The magnetic properties, i.e., Hc and areal moment density Mrt, are controlled by the granularity (grain size and grain distribution), the degree of chemical ordering, and the addition of one or more nonmagnetic materials, such as Cr, Ag, Cu, Ta, or B. The resulting granular magnetic film has magnetic properties suitable for application in high-density, horizontal magnetic recording media.

The invention discloses a simulation method of texture evolvement of a heat affected zone in a welding process, relating to a fine texture simulation method of a welding connector and aiming at solving the problems that the quantification of the present fine texture evolvement of a weld joint is mainly based on an experiential or half experiential deterministic model or analysis calculation, and only the texture content is calculated but the state, the size and the distribution of the texture cannot be reflected dynamically. The method comprises the following steps: step 1, calculating the temperature fields of the heat affected zone; step 2, calculating the crystalline grain growth process of crystalline grains at different positions above a beta phase zone according to the distribution of the temperature fields; and step 3, calculating continuous cooling solid state phase change according to the cooling velocity and the beta phase crystalline grain distribution calculation result obtained through the temperature field calculation. The simulation method is used for the fine texture simulation of the welding connector.

The invention relates to a manufacturing process of a ceramic accessory tile and the ceramic accessory tile. The manufacturing process comprises the steps of: (1) printing a ground coat on the surface glass layer of sintered ceramic tile; (2) conducting ink-jet printing on the printing ground coat to form patterns; (3) applying transparent dry grains on the surface of the pattern layer for two times, and sintering; (4) electroplating metal color on a groove of the surface glass layer by adopting a lamination positioning electroplating method, and sintering; (5) polishing the surface of the sintered product; and (6) cutting the sintered accessory tile blank to prepare the accessory tile. The ceramic accessory tile comprises a base tile, ground coat applied on the surface of the base tile, the pattern layer attached on the ground coat, and the first dry grain layer and the second dry grain layer applied on the pattern layer. Irregular pits, grooves or concave curves, wherein the irregular pits, the grooves or the concave curves are hollowed towards the inside and are arranged on the layer surface of the second dry grain distribution layer. The accessory tile varieties include ground flowers, ground line, waist line and corner, and is used for supporting the ceramic wall and floor tiles.

The invention relates to a grinding method to improve aluminum ore grinding particle distribution. It screens or separates the fine aluminum ore or paste, with thick particles or block ore for grinding. Using quick grinding, forced ore extraction and highly efficient leveling technique, it reduces the regrinding for acceptable grain product, reducing pelitization or overgrinding, especially fine level content, with -200 being 85%, reducing -400 content lower than 40%, significantly improving grain distribution of the grind ore and reduced grinding energy consumption.

The invention discloses a chemical processing method, in particular to a preparation method for utilizing a solvothermal method to synthesize nano iron oxide. The invention adopts a certain amount of ferric chloride and dissolves the ferric chloride into a certain amount of methanol, ethanol or glycol and then a certain amount of sodium hydroxide is added, and later ultrasonic sound is adopted to equally disperse the mixture, and then the prepared mixture is transferred into a hydro-thermal reactor for a hydro-thermal processing under the temperature of 140 to 200 DEG C, and de-ethanol and/or deionized water for reaction liquid are adopted to wash reactants, and a centrifuge is adopted to remove the glycol solution and spare sodium hydroxide; the reactant is dried to obtain the iron oxide powder. The invention has the advantages that the method is simple, safe and reliable; the material is cheap; the output is high; the dispersity is better and the grain distribution is narrow, etc. The invention can be widely used by iron oxide manufacturers.

The invention discloses a hard alloy blade and a preparation method thereof. The hard alloy blade comprises a hard alloy blade basal body and a coating layer; the hard alloy blade basal body uses Co as a binding phase, and uses tungsten carbide and a titanium-contained cubic-phase compound as a hard phase; the solid solution is performed for a W element and a Cr element in the binding phase; the mass fraction of the W element in the binding phase is 2-10 wt.%; the mass fraction of the Cr element in the binding phase is 1-10 wt.%; the titanium-contained cubic-phase compound is a carbon-nitrogen compound containing one or two in a Ta element and a Nb element and a Ti element; and the grain distribution of tungsten carbide has a double-peak structure. The preparation method comprises batching, powder preparation by mixing, molding by pressing, sintering and preparation of a coating layer. The hard alloy blade has the advantages of high hardness, toughness and strength and excellent and stable cutting performance, and is high in generality, suitable for various processing fields, simple in preparation method and low in cost.

In one aspect, the invention includes a heat stable, formed ceramic component that includes a multimodal grain distribution including (i) at least 50 wt % of coarse grains including stabilized zirconia, the coarse grains comprising a D50 grain size in the range of from 5 to 800 μm, based upon the total weight of the component; and (ii) at least 1 wt % of fine grains comprising a D50 average grain size not greater than one-fourth the D50 grain size of the coarse grain, dispersed within the coarse grains, based upon the total weight of the component; wherein after sintering, the component has porosity at ambient temperature in the range of from 5 to 45 vol. %, based on the formed volume of the component. In other embodiments, the invention includes a process for the manufacture of a hydrocarbon pyrolysis product from a hydrocarbon feed using a regenerative pyrolysis reactor system, comprising the steps of: (a) heating a pyrolysis reactor comprising a bi-modal stabilized zirconia ceramic component to a temperature of at least 1500° C. to create a heated reactive region, wherein after exposing the component to a temperature of at least 1500° C. for two hours the component has a bulk porosity measured at ambient temperature in the range of from 5 to 45 vol. %, based on the bulk volume of the component; (b) feeding a hydrocarbon feed to the heated pyrolysis reactor to pyrolyze the hydrocarbon feed and create a pyrolyzed hydrocarbon feed; and (c) quenching the pyrolyzed hydrocarbon feed to produce the hydrocarbon pyrolysis product.

The invention provides a method and a system for reconstruction and analysis of an earth-rock aggregate three-dimensional microstructure. The method includes preparing an earth-rock aggregate sample, subjecting the earth-rock aggregate sample to computed tomography (CT) scanning to acquire a CT cross-section image sequence of the earth-rock aggregate sample, acquiring rubble cross-section area of each CT cross-section image of the CT cross-sectional image sequence and dividing the rubble cross-section area into multiple independent rubble cross sections, registering the independent rubble cross sections in each CT cross-section image to generate a three-dimensional microstructure model of rubbles according to a registration result, analyzing the three-dimensional microstructure model to determine rock percentage, grain distribution, rubble spatial distribution, rubble geometrical features and rubble morphological characteristics of the earth-rock aggregate sample. The three-dimensional microstructure model is easy to generate by the method and the system. The method and the system have the advantage of accurate and reliable analysis result of the earth-rock aggregate and can be applied to numerical calculation and analysis directly.

The invention relates to a synthesis method of nanometer oxide powder, which belongs to the technical field of ultra fine powder preparation. The method comprises the following steps: respectively adding acid substances and alkaline substances into proper dispersing agents and surface active agents; carrying out mixing reaction again on two mixtures under a certain mixing condition at the proper temperature after being uniformly dispersed under a certain dispersing condition; and thus, directly synthesizing the required oxide nanometer powder. The synthesis method does not need high-temperature calcination, and inhibits the generation of the glomeration and the excessive growth of crystal grains, and the oxide powder with the grain diameter between 5 and 100 nm, uniform grain granular size, narrow grain distribution and uniform and stable ingredient can be directly prepared from the solution. The powder prepared by the synthesis method has high chemical activity and wide application range.

The invention discloses microemulsion for animals and a preparation method thereof. The microemulsion for animals comprises effective components and auxiliary solvents, which are 1 to 30 percent of effective components, 10 to 20 percent of surfactant, 5 to 10 percent of cosurfactant, 10 to 25 percent of oil phase, and the balance of water based on the total amount of 100 percent. The microemulsion prepared by the method has the advantages of small grain sizes, narrow distribution range, uniform grain distribution and good stability, has better curative effect compared with conventional preparation, and can be used for preparing medicament which is widely used in clinical veterinarian.

The invention relates to a preparation method of high-toughness and high-thermal-stability hot work die steel. The preparation method comprises the following steps of optimizing alloy components, andstrictly controlling the production process; and the specific process route is as follows, electric furnace smelting, ladle refining furnace refining, vacuum refining furnace refining, electrode blankcasting, protective atmosphere electroslag furnace remelting, forging, ultrafine treatment and spheroidizing annealing production processes are adopted at the same time. The invention further relatesto the high-toughness and high-thermal-stability hot work die steel prepared through the preparation method. The product has the advantages of uniform annealed microstructure, favorable spheroidizedstructure, fine and uniform grain distribution and uniform quenched and tempered structure, and the fine precipitated phases of the Mo and Cr carbides have the dispersion strengthening action in the use process, thereby enhancing the properties of the material and endowing the material with high toughness and high isotropy. The product can be widely used for manufacturing hot extrusion dies, mandrels, hammer dies of die forging hammers, dies of forging presses and dies for precision forging machines, and particularly can be used as a high-end die-casting die made of aluminum, copper and alloysthereof.

The invention provides a granularity-controllable boehmite preparation method and relates to the field of new materials. The granularity-controllable boehmite preparation method comprises the following steps: mixing Al(OH)3 and water to form a suspension with the concentration of 20-60% (by weight percent); adjusting the pH of the suspension to be 2-9; treating the suspension for 24-40 h at the temperature of 170-240 DEG C and the pressure of 1.0-1.7 MPa; filtering, drying and dispersing the treated suspension to obtain monodispersed boehmite with the granularity of 0.1-10 micrometers. The granularity-controllable boehmite preparation method is a wet preparation method of boehmite, and the prepared high-purity boehmite is narrow in grain distribution, uniform in appearance, controllable in granularity and favorable in dispersity. The granularity of boehmite can be adjusted through adjusting the pH value and the time of reaction and the granularities of the raw materials.

The invention relates to a preparation method of precision casting fused quartz powder and quartz powder produced by the method. The preparation method comprises the following steps of: smashing, sieving, purifying, fusing by an electric furnace, smashing, dry type ball-milling and sieve for a quartz raw material to obtain a product. An ultrasonic field is introduced in the scouring purifying and washing process of quartz, so that the content of impurities in powder is effectively reduced, and the step time is greatly shortened and the production efficiency is improved. Full grain fused quartz powder required is directly obtained by optimizing ball-milling process parameters and adopting a unique feeding mode, so that the grain composition step in conventional method is reduced. The method is simple in technical process, short in period, low in energy consumption and low in cost, and is beneficial for large-scale batch production. The fused quartz powder produced is high in purity, wide in grain distribution, free from graduation, mellow and full on surface of grains and good in rheological property of paint, and can be better applied to the field of investment casting and can partially or completely replace expensive shell material zircon power, so that the production cost of precision casting is effectively reduced.

The nanometer-nanometer type Al2O3-base heterogeneous ceramic consists of nanometer Al2O3 50-95 vol%, and nanometer SiC, TiC, Si3N4, AlN, BN, TiN or ZrB2 5-50 vol%. Its preparation process includes steps of preparing material, ball milling, forming, heat treatment of biscuit, assembling biscuit, high pressure sintering, etc. The present invention adopts high pressure and low temperature fast sintering without need of atmosphere control, and the produced nanometer-nanometer type Al2O3-base heterogeneous ceramic has homogeneously nanometer level crystal grain distribution, high density and excellent performance, and may be used in crucial conditions, such as being used as ceramic cutter, antiwear and anticorrosive device, high temperature utensil, etc.

The invention discloses a preparation method of high-performance sintering permanent magnetic ferrite magnet. The magnet is prepared by the method that pre-sintered powder with main phase of Ca(x1)Sr(x2)Ba(x3)La(x)O nFe2O3 is added with second additive to obtain high-performance magnet with Br higher than 4200Gs, Hcj higher than 4500Oe and rectangularity Hk/Hcj higher than 0.94 through high-temperature soft ball milling process, wherein x1 is 0.05-0.40, x2 is 0.20-0.60, x3 is 0-0.15, x is 0.1-0.5, and n is 6.0-6.5. The preparation method disclosed by the invention has the advantages that the rare precious metal cobalt is not added into the preliminary pre-sintered powder, thus being favorable for large-scale production; the second additive is reasonable, the adjustability of addition of the rare precious metal cobalt is high, thus being more economical; and the high-temperature soft ball milling process is adopted in the ball milling process, so the ball milling time is short, the grain distribution is narrow, the average grain size is large, no dispersant is added, the dehydration property is good, and the molding efficiency is high.

The invention relates to the field of hard alloy materials, in particular to a hard alloy raw material and a method for preparing a hard alloy cutter material through the hard alloy raw material. The hard alloy raw material comprises, by weight percentage, 80% to 90% of tungsten carbide, 6%-12% of cobalt powder, 0%-5% of titanium carbide, 0%-5% of titanium nitride and 0%-0.5% of microelements. The grain distribution of raw material powder ranges from 0.5 micrometer to 2 micrometers. The method for preparing the hard alloy cutter material through the hard alloy raw material includes the steps of powder mixing, ball milling, drying, sieving, block pressing, presintering, high-temperature vacuum sintering and high-temperature nitrogen sintering. The hard alloy cutter material prepared through the method is low in manufacturing cost, high in hardness, good in wear resistance and high in film-substrate cohesion, and the surface has the gold or reddish brown appearance; and the relative density of the hard alloy cutter material prepared through the method is higher than 99%, the hardness ranges from 20 GPa to 28 GPa, the breakage toughness ranges from 6 MPa.m<1/2> to 8 MPa.m<1/2>, and the film-substrate cohesion critical load obtained through a scratch method test is larger than 80 N.

The invention particularly relates to a manufacture method for a staining resistant artificial quartz stone, which includes the steps of quartz stone powder sand surface modification, mixed pressing, sizing and solidifying and the like to generate a transparent film on the surface of the artificial quartz stone. The manufacture method has the advantages that by means of mechanical activation and modification of quartz stone powder sand serving as raw materials of the artificial quartz stone, flowability of the quartz stone powder sand during pressing is enhanced so that the quartz stone powder sand tends to be accumulated orderly and most densely, and binding of the quartz stone powder sand and resin during solidification is enhanced; the proportion and the grain distribution range are strictly controlled in an artificial quartz stone formula so that micron-sized pore quantity on the surface of the artificial quartz stone is decreased maximally; the surface of the artificial quartz stone is filled to form chemical adsorption so as to improve glossiness of the surface of the artificial quartz stone; and the micron-sized film formed on the surface of the artificial quartz stone has the hydrophobic feature, oil stains within 24 hours can be cleaned by wet cotton cloth, and hidden dirt and bleeding are effectively prevented, therefore, the artificial quartz stone is high in staining resistance. The manufacture method is simple in process, easy in operation and short in consumed time.

The invention discloses a method for treating arsenic-containing wastewater and solidifying arsenic. The method comprises the following steps: separating and enriching arsenic in the arsenic-containing wastewater in the form of calcium arsenate or/and calcium arsenite precipitate; and oxidizing the obtained arsenic enriched product in a ferric sulfate or ferrous sulfate solution, and carrying outnormal-pressure reaction or pressurized hydrothermal reaction or normal-pressure hydrothermal reaction, so that arsenic in the arsenic enriched product is solidified in the form of scorodite crystals.The obtained scorodite crystals are complete in grain development, uniform in grain distribution and stable in structure under acidic conditions. The method has the advantages of high operation efficiency, good arsenic fixation effect, convenience in operation, low arsenic solidification treatment cost and the like, and is suitable for industrial application of harmless treatment of arsenic-containing wastewater.

The invention discloses a three-dimensional modeling method of the surface morphology of a parallel diamond grinding wheel. The method comprises the steps of defining a parallel diamond grinding wheelmodel and an abrasive grain model, calculating an average space of the abrasive grains according to the surface morphology of a grinding wheel and a grinding wheel concentration, carrying out cube mesh division on the grinding wheel and establishing a cube virtual lattice, carrying out spherical abrasive grain initial positioning in the center of a cube such that spherical abrasive particles randomly move in the virtual lattice, replacing the spherical abrasive particles with defined actual abrasive grains and carrying out turning of different directions to realize direction offset, definingthe surface of a bonding agent to obtain a plate-shaped grinding wheel surface morphology model, and carrying out circular bending on the plate-shaped grinding wheel surface morphology model to obtaina parallel diamond grinding wheel surface morphology model. According to the method, multiple shapes of abrasive particles are used, an abrasive grain size, an abrasive grain distance and abrasive grain distribution are considered to establish the grinding wheel surface morphology model, the model is more close to the actual parallel diamond grinding wheel surface morphology, and the grinding performance and result of the grinding wheel can be accurately evaluated and predicted.