91 results about "Spray Granulation" patented technology

This invention belongs to the field of fluidized bed spray granulation technology, and provides a fluidized bed spray granulation device for fluopyram·cymoxanil water-dispersible granules. The device includes a fluidized bed tower with a discharge pipe connected to its bottom; an air inlet pipe connected to the bottom of the fluidized bed tower; an exhaust pipe connected to the top of the fluidized bed tower; a cyclone separator connected to the other end of the exhaust pipe; an extraction pipe connected to the upper part of the cyclone separator; and an induced draft fan installed on the extraction pipe. By relying entirely on the existing structure of the original fluidized bed equipment, the induced draft fan power, and the fine powder recycling system, only simple welding modifications to the main body of the equipment are required. No new power units such as fans and motors are needed, and no adjustments to the original airflow design are required. The modification can be completed simply by coaxially nesting a screen cylinder assembly inside the discharge pipe and connecting a recycling hose. It can be quickly disassembled and reassembled, restoring the equipment to its original factory state at any time. The modification cost is low, and it is compatible with most models of top-spray fluidized bed granulators on the market.

This application belongs to the field of powder metallurgy technology, specifically a bicrystalline cemented carbide and its preparation method. The preparation method includes the following steps: mixing fine WC powder (2~4μm), Co powder, VC, and Cr3C2, followed by ball milling and spray granulation to obtain fine WC-Co composite powder; mixing coarse WC powder (8~12μm), Co powder, and ultrafine WC powder (0.15~0.25μm), followed by ball milling and spray granulation to obtain coarse WC-Co composite powder; and dry mixing, pressing, and sintering the fine WC-Co composite powder and the coarse WC-Co composite powder to obtain a bicrystalline cemented carbide with a Rockwell hardness of 87~90 HRA and a fracture toughness of 14~17 MPa·m. 1 / 2 The bending strength is 2500~3000MPa. This application prepares coarse and fine WC-Co composite powders separately, so that the inhibitor can effectively suppress the growth of fine WC grains during the sintering stage, while the ultrafine WC can promote the growth of coarse WC grains. This results in the prepared cemented carbide exhibiting a clear dual-scale WC grain distribution, while possessing both high hardness and high toughness. After dry mixing and pressing sintering, the prepared bicrystalline cemented carbide has high density.

The application discloses a kind of plasma spraying self-reduction TiC / Ti composite coating and its preparation method and application, belong to thermal spraying coating field, TiC powder, deionized water and binder are mixed and stirred and ball milled, and TiC spherical powder is prepared by spray granulation;Using plasma spraying process, TiC spherical powder is sprayed on substrate, so that TiC occurs self-reduction reaction to generate Ti metal phase, and forms plasma spraying self-reduction TiC / Ti composite coating on substrate;In plasma spraying self-reduction TiC / Ti composite coating, Ti metal phase is distributed between TiC ceramic phase, and forms layered inlay structure.The application uses TiC powder as raw material, and generates Ti metal bonding phase in situ by adjusting and controlling plasma spraying process parameters during spraying process, avoids additional metal bonding phase and subsequent annealing treatment, simplifies process flow and reduces cost.The bonding strength of the prepared plasma spraying self-reduction TiC / Ti composite coating can reach 52.40 MPa at most, which significantly improves the problem of large brittleness and poor interface bonding of traditional TiC coating.

The application belongs to the technical field of lithium battery cathode material preparation, and relates to a method for recycling and preparing lithium manganese iron phosphate and the lithium manganese iron phosphate. First, recycled lithium iron phosphate black powder, a manganese source and deionized water are uniformly mixed according to a proportion, a precipitant is added in the process, the mixed slurry is filtered after synthesis is completed, and the filter cake is dried to obtain a solid product; the solid product is placed in a calcining furnace for first sintering to obtain a precursor 1; then the precursor 1 is mixed with a phosphorus source, a lithium source and a carbon source according to an element proportion, sand grinding and spray granulation are performed under deionized water as a solvent to obtain a precursor 2; the precursor 2 is placed in an atmosphere furnace for second sintering, and lithium manganese iron phosphate cathode material is obtained after crushing, screening and iron removal. The raw material of the application is recycled material, which is low in price and can reduce the recycling cost; the prepared lithium manganese iron phosphate material is excellent in processing and electrical performance, and the process and operation are easy to be industrialized for large-scale production.

This invention provides a high work function metal oxide target material and a method for producing the same. [Solution] The manufacturing method includes the steps of: mixing high work function metal oxide powder, indium oxide powder, and zinc oxide powder into a mixed powder in a predetermined mass ratio; putting the mixed powder into deionized water, adding a dispersant, and preparing a slurry; performing high-energy sand mill grinding on the slurry, and adding a binder before the end of sand mill grinding; spray granulation of the slurry to obtain spherical granulated powder; performing mold press molding and cold isostatic pressurization on the spherical granulated powder to obtain a target material blank; and performing degreasing and sintering integration treatment on the target material blank to obtain a high work function metal oxide target material. [Effects] The disclosed target material has a small crystal grain size, uniform distribution, high density, and excellent electrical performance, and can be used in the manufacture of flexible OLED anodic layer thin film materials.

This invention relates to the field of medical ceramic materials technology, and more particularly to a method for preparing a zirconia-based medical composite ceramic material. The method includes: adjusting the target number of cycles in response to the slurry mixing state, or compensatingly adjusting the spray granulation process parameters based on slurry state parameters; determining whether the current batch of green bodies has a risk of closed pores based on the green body characteristics, and determining an adjustment feature point based on the actual shrinkage rate variation; stopping the sintering heating and adding a holding stage in response to the adjustment feature point, and determining the intermediate holding temperature and the holding stage duration; obtaining the sintered body phase to determine the tetragonal zirconia retention rate, and determining whether the sintering adjustment strategy matches the characteristics of the current batch of slurry based on the sintered body performance; and adjusting the intermediate holding temperature of subsequent sintering processes based on the tetragonal phase retention rate deviation in response to the sintered body performance. This invention improves the performance of ceramic implants by adjusting the sintering temperature curve based on the characteristics of zirconia-based powder.

A process for preparing a granule containing (A) at least one chelating agent selected from alkali metal salts of methylglycinediacetic acid (MGDA) and iminodisuccinic acid (IDS) and, optionally, (B) at least one homopolymer or copolymer of (meth)acrylic acid, partially or completely neutralized with alkali, wherein said process comprises the steps of (a) providing an aqueous solution or slurry containing chelating agent (A) and, if applicable, (co)polymer (B), (b) removing most of said water by spray granulation in a fluidized bed, (c) treating the resulting granule in a vessel at least a portion of which rotates about a horizontal axis and wherein said vessel is selected from paddle mixers, drop mixers, and grate mixers.

This invention discloses a high-thickness, high-purity MAX phase coating and its preparation method. The method includes: 1. Mixing a metal oxide and a carbon source, followed by high-energy ball milling and spray granulation to prepare spherical precursor powder; 2. Depositing a transition layer on a sandblasted substrate surface using plasma spraying, and then depositing the spherical precursor powder on the transition layer to form a precursor coating; 3. Immersing the substrate with the precursor coating in molten salt for electrolysis, causing the precursor coating to be electro-deoxidized and converted into a MAX phase coating. This invention employs a synergistic process of "plasma spraying-molten salt electrochemical conversion," converting the sprayed precursor coating into a MAX phase coating through in-situ electro-deoxidation in molten salt electrochemistry. This process has high deposition efficiency and avoids the defects of carbon loss, phase decomposition, and oxidation in the coating product when directly thermally spraying MAX materials. It achieves the preparation of a high-thickness, high-purity MAX phase coating, suitable for the field of surface protection.

The application discloses a preparation method of imitation volcanic stone foamed ceramic, which comprises the following steps: (1) preparing foamed ceramic powder: after a known foamed ceramic base material taking silicon carbide as a foaming agent is prepared into a base powder through ball milling and spray granulation, a pore-forming material is added and uniformly mixed, the mass ratio of the base powder to the pore-forming material is 70-85:15-30, and the particle size range of the pore-forming material is 6-30 meshes; (2) spreading the foamed ceramic powder according to a preset thickness in a refractory kiln, and scraping; (3) sending into a kiln for firing, the firing temperature is 1160-1170 DEG C, and the firing period is 8-13.5 h; (4) removing the refractory kiln after cooling out of the kiln, and thus imitation volcanic stone foamed ceramic is obtained. In step (1), the content of silicon carbide in the pore-forming material is greater than the content of silicon carbide in the foamed ceramic base material. The foamed ceramic after firing can form an imitation volcanic stone decorative effect with pores of different sizes.

This invention discloses a method for preparing highly stable gyromagnetic ferrites, belonging to the field of magnetic material preparation technology. The method includes formulation preparation, multi-stage sand milling and granulation, molding and sintering, composite structure preparation, and precision machining steps. The formulation consists of VIII-series, IIIB-series, lanthanide-series, IVB-series, and VIIB-series metal oxides in a specific molar ratio, with rare earth nano-additives added to enhance lattice stability. Uniform slurry particle size is achieved through two-stage sand milling and spray granulation. A curved sintering process is used to control the temperature rise and oxygen content to obtain a high-density green body. A yttrium iron garnet or dysprosium iron garnet functional layer is formed on the surface of the green body by magnetron sputtering, constructing a multi-layer composite structure. Finally, a conductive modification layer is formed on the surface through integrated laser cutting and chemical mechanical polishing. The gyromagnetic ferrite material prepared by this method exhibits high saturation magnetization, low high-frequency loss, and excellent thermal stability, making it suitable for 5G communication, radar, and high-frequency microwave devices.

The application belongs to the technical field of hard alloy, and particularly relates to high-performance hard alloy with dispersed and uniform tantalum carbide and a preparation method thereof. The preparation method comprises the following steps: adding potassium fluotantalate solution into a cobalt-nickel solution; adjusting the pH of the solution to make cobalt, nickel and tantalum completely precipitate, and then filtering, washing with water and drying to obtain cobalt-nickel-tantalum precursors; then reducing, crushing and sieving to obtain precursor powder; mixing the precursor powder with carbon black, tungsten carbide and paraffin, and then wet ball-milling, spray granulating, preparing a compact and sintering to obtain high-performance hard alloy. By adding nickel element, using a liquid-liquid mixing method and reducing, superfine cobalt-nickel solid solution powder is obtained, which can improve the toughness of the alloy; the conversion of tantalum is completed in the sintering process, which is beneficial to the dispersion of tantalum and the strengthening of the alloy performance, improves the solid solution amount of tantalum in cobalt-nickel, inhibits the sintering growth of WC, and improves the hardness and wear resistance of the alloy.

This invention relates to the field of composite material coating technology, specifically to a high-temperature sprayed iron-based composite material coating and its preparation method, comprising the following steps: S1. Grinding the surface protrusions of the substrate, cleaning and degreasing it, ultrasonically cleaning it with anhydrous ethanol and drying it, and then sandblasting it with white corundum to obtain a pretreated substrate; S2. Preheating the pretreated substrate, and spraying modified spraying powder onto the surface of the substrate to obtain a sprayed substrate; S3. Cutting the sprayed substrate into discs, remelting the discs using a remelting device, and cooling them to room temperature to obtain a high-temperature sprayed iron-based composite material coating. This invention effectively improves the coating's bonding strength, pitting resistance, and wear resistance through the synergistic effect of modified metal powder and modified spraying powder. Together with dry premixing, wet dispersion, and spray granulation processes, they solve the problems of uneven distribution of the reinforcing phase and poor powder flowability in traditional mechanical mixing methods.

The application relates to the technical field of intelligent control, and discloses an intelligent control method for an alumina powder spray granulation process, which comprises the following steps: collecting multi-source process parameters in the running process of a spray granulation tower in real time, and generating an original process parameter data set; performing data fusion and feature extraction processing on the original process parameter data set to generate a key process feature vector; when real-time control of the alumina powder spray granulation process is performed, feeding forward prediction of key powder performance indexes is performed through a pre-trained powder performance prediction model, and the process state is judged in advance in combination with a granulation process state evaluation index, so that the system can evaluate the potential deviation trend of the powder performance in real time and prospectively, the problems that powder performance data cannot be acquired in real time and prospectively predicted and adjustment lag exists in traditional methods are solved, the pre-control property of the granulation process and the stability of the powder quality are ensured, and the risk of non-standard batch quality is reduced.

This utility model relates to a modular spray granulation drying chamber that is easy to clean, belonging to the field of spray granulation drying technology. It includes a mounting frame, a support frame fixedly connected to the top of the mounting frame, a feeding chamber on the top of the support frame, an outer shell on the top plate of the mounting frame, an inner barrel inside the outer shell, and a connecting barrel fixedly connected to the mounting frame, with the top of the connecting barrel fitting snugly against the bottom of the inner barrel. By using the mounting frame, support frame, feeding chamber, outer shell, inner barrel, motor, bidirectional threaded rod, and threaded block in coordination, the drying chamber of the spray granulation dryer can be quickly cleaned, significantly improving cleaning efficiency, shortening downtime, and allowing for thorough cleaning of the drying chamber without dead corners, reducing cross-contamination, thereby reducing the risk of material residue, ensuring product quality, extending equipment life, and reducing maintenance costs.

This invention relates to the field of ceramic technology, specifically to a corrosion-resistant daily-use ceramic and its preparation method. The ceramic body is obtained by firing basic green body particles that have undergone outer coating and sequential treatment with a dual zirconium source. The core of the method lies in: at the end of the spray granulation stage, a carboxyl-grafted polysiloxane precursor and aluminum nitrate nonahydrate are used to coat the outer layer of the basic green body particles; subsequently, zirconium acetylacetonate and zirconium oxynitrate are introduced sequentially for treatment. This technical solution can precisely enrich the modified components in the outer layer and interface region of the green body particles, thereby significantly improving the ceramic's acid and alkali corrosion resistance, post-corrosion mechanical strength retention, and mechanical washing resistance without significantly altering the traditional potassium feldspar-quartz-kaolin main formulation.

This invention relates to a protective slag for sulfur-containing free-cutting steel crystallizers using photovoltaic silicon mud and its preparation method. The protective slag of this invention contains, by mass percentage, 30.6–31.6 wt% CaO, 36.7–37.7 wt% SiO2, 6.1–7.1 wt% Al2O3, 8.2–9.2 wt% Na2O, 5.0–6.0 wt% F, and 9.0–10.0 wt% C. 固 H2O up to 0.5 wt%; C 固 The carbon in the protective slag is fixed. Raw materials include 7-9 wt% silica mud, 14-16 wt% blast furnace slag, 24-26 wt% phosphorus slag, 14-16 wt% silicate cement, 4-6 wt% wollastonite, 10-12 wt% soda ash, 2-4 wt% fluorite, 6-8 wt% cryolite, and 10-12 wt% carbon powder. The preparation method includes batching, slurry preparation (solid content 40-45%), spray granulation (spray gun orifice diameter 1.0-1.5 mm, inlet temperature 450-480℃), and post-treatment. This invention enables the utilization of photovoltaic silica mud, reducing the cost of protective slag containing silica mud by 870 yuan per ton, and increasing the flaw detection pass rate of continuously cast billets from 25.99% to 55.17%, thus possessing both energy-saving and emission-reduction value and a circular economy value.

This utility model relates to a spray granulation tower for processing alumina ceramic materials, including a heating system and a granulation component disposed at the air outlet of the heating system. The granulation component further includes a granulation tower body, and includes a filter component disposed at the top inside the granulation tower body to prevent ceramic particles from being discharged with the air. The filter component includes several vertically arranged filter bags for filtering ceramic particles, and also includes a drive mechanism for shaking the filter bags. This utility model improves the utilization rate of raw materials by providing a filter component at the top of the granulation tower body to prevent the formed particles from escaping with the air from the granulation tower body.

This invention discloses a method and application for in-situ decarburization of SiC nanowires to reinforce dental all-ceramic materials, belonging to the field of biomedical ceramics technology. The method includes the following steps: first, SiC nanowires are prepared by polycondensation and carbothermal reduction using organosilicon and carbon sources as raw materials; then, they are mixed with a dispersion medium, dispersant, PVA solution, and 5Y-PSZ ceramic powder to prepare a composite powder; subsequently, a green body is prepared by spray granulation and dry pressing; finally, the finished product is obtained through atmospheric pressure sintering, decarburization treatment, and secondary sintering. This invention uses SiC nanowires as a precursor, doping and decarburizing 5Y-PSZ to in-situ transform the SiC nanowires into SiO2 nanowires. This achieves crack deflection, bridging, and pull-out strengthening of the nanowires themselves, while simultaneously forming synergistic strengthening with the compressive stress generated by decarburization, significantly improving the mechanical properties of the material. This solves the problems of insufficient strength and mismatch between the nano-reinforcing phase and the matrix interface in materials prepared by existing technologies.

The application provides a preparation method of Nb5Si3 composite spheroidized powder, comprising the following steps: A) mixing Nb powder, Si powder, PVA and water and ball milling to obtain a slurry; the slurry is sprayed and granulated, and sieved to obtain Nb5Si3 composite agglomerated powder; B) the Nb5Si3 composite agglomerated powder is subjected to plasma spheroidization, and the Nb5Si3 composite spheroidized powder is obtained. In the application, Nb powder and Si powder are combined with in-situ reaction between Nb and Si in a molten state in a laser additive process and a rapid solidification process, so that a submicron Nb5Si3 particle reinforced Nb5Si3 / Nbss refractory alloy can be obtained. Compared with a cast refractory alloy with the same composition, the size of the Nb5Si3 particle reinforced phase can be greatly reduced from dozens of microns to submicrons, so that the brittleness of the particle reinforced refractory alloy is greatly reduced, and the strength of the particle reinforced refractory alloy is obviously improved based on the Orowan strengthening principle.

The application relates to a preparation method of an antioxidative high-purity graphite product, and belongs to the technical field of graphite products. The application comprises the following steps: preparing a multi-level structure nano precursor through electrostatic spray granulation combined with programmed pyrolysis; mixing and kneading the precursor with graphite powder, carbon black and coal pitch, cold isostatic pressing, programmed baking, impregnation-carbonization circulation and gradient purification treatment to obtain a nano composite graphite matrix; sequentially loading a nano seed layer, a CVD deposited SiC transition layer, reaction infiltration densification and purification treatment on the surface of the matrix, and finally performing finishing and ultrasonic cleaning and drying to obtain the graphite product. Through the double enhancement of the multi-level structure nano precursor on the matrix and the coating, in combination with gradient purification and gradient coating design, the purity and the antioxidative performance of the graphite product are remarkably improved, and the graphite product is suitable for high-end applications in high-temperature harsh environments.

The utility model relates to compound fertilizer processing technical field, and disclose a kind of compound fertilizer production spray drying device, including spray granulator, and the side of granulating box is equipped with exhaust pipe, and one end of exhaust pipe is equipped with cleaning structure, and cleaning structure includes air induction pipe component and the support of installation at air induction pipe component bottom end, and the side top end of support is equipped with cleaning box, and the position of clear water will be lower than the top end position of outer air induction pipe, and outer air induction pipe carries out shunting to hot air and powdery compound fertilizer, and hot air and powdery compound fertilizer are introduced into clear water in box inside using inverted U shape inner tube, when the bubble generated in clear water floats, the thorn needle set will be broken to bubble, and clear water can capture powdery compound fertilizer by wetting and adhering effect, to reduce the diffusion of powdery compound fertilizer, avoid pollution external environment.

This invention discloses an intelligent control system for ceramic tile production processes, used for the automated control of a spray drying granulation system. It includes a blower, heater, spray drying tower, liquid tank, conveying pump, separator, dust collector, induced draft fan, and control device. The sprayer includes a shell and a cover plate. The key feature is that a first vortex chamber and a second vortex chamber are separated by a partition wall and fluidly connected only through a connecting channel, which is approximately tangent to the outer periphery of both chambers. An inlet hole, approximately tangent to the outer periphery of the first vortex chamber, is provided. A first vortex impeller assembly is rotatably installed in the first vortex chamber, and a second vortex impeller assembly is rotatably installed in the second vortex chamber. This invention ensures the uniformity of the liquid concentration, improves the vortex performance of the liquid, enhances the uniformity of the sprayer's spray, and increases the spray / spray granulation efficiency.

This invention relates to the field of grouting technology, specifically to a rare earth modified thermal insulation grout and its preparation method, as well as a method for preparing rare earth modified hollow spheres. The rare earth modified thermal insulation grout is made from the following raw materials in parts by weight: 23-50 parts rare earth modified hollow sphere aggregate, 15-30 parts lightweight waste brick aggregate, 20-30 parts rare earth modified hollow sphere fine powder, 10-20 parts lightweight waste brick fine powder, 1-5 parts Shuozhou clay, and 0.05-0.2 parts of a first dispersant; a first binder comprising 20-40% of the total weight of the above raw materials; wherein the rare earth modified hollow spheres are obtained by mixing rare earth compounds, waste crucible powder, and refractory oxides, followed by wet ball milling and granulation. This invention, through ball milling and spray granulation processes of rare earth oxides, carbonates, waste crucibles, and refractory oxides, produces rare earth modified hollow spheres with a unique hollow structure and excellent performance. These hollow spheres not only have a low density but also exhibit good thermal insulation properties, providing a new approach to lightweighting and thermal insulation of grouting materials.

This invention discloses a low-temperature rapid-fired high-density building ceramic brick and its preparation method, belonging to the technical field of building ceramic materials. The ceramic brick uses potassium-sodium feldspar, kaolin, clay, quartz sand, calcined talc, wollastonite, waste ceramic powder, a low-temperature eutectic densifying component, sodium carboxymethyl cellulose, sodium polycarboxylate dispersant, and water as raw materials. The low-temperature eutectic densifying component has a borosilicate glassy phase coating layer, lithium aluminum silicon crystal nuclei, and a calcium-magnesium flux phase. The brick is prepared by ball milling, spray granulation, aging, pressing, drying, and rapid firing. This invention can promote liquid phase wetting, interstitial filling, and glassy phase bridging under low-temperature rapid firing, improving density, mechanical properties, and the utilization rate of waste ceramic powder.

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 utility model discloses a spray granulation device, belonging to the technical field of spray granulation devices. It includes an output pipe, a device body, and a sealing ring. The output end of the pump is connected to the output pipe, and a nozzle is movably mounted on the bottom end of the output pipe via a sealed bearing. Large holes are evenly distributed on the outer wall of the nozzle, and small holes are distributed on the outer wall of the nozzle on one side of the large holes. Baffles are installed on the outer sides of the large holes, and rotating sleeves are connected to both ends of the baffles. A screen is installed on the inner side of the screening box. This utility model utilizes the outward pulling of a pull plate, which deforms the first return spring, causing the movable rod to move the locking block away from the second locking hole. Then, the operator rotates the rotating sleeve, causing the baffle to move simultaneously to block the small holes. After releasing the pull plate, the first return spring returns to its original position, causing the locking block to engage in the first locking hole and lock. This facilitates switching between large and small holes without changing the nozzle, solving the problem of inconvenient adjustment of granulation size.

This invention discloses an amoxicillin capsule and its preparation method, relating to the field of pharmaceutical technology. The preparation method includes the following steps: S1: Wet ball milling of amoxicillin trihydrate and hydroxypropyl methylcellulose E5, followed by spray drying to obtain surface-modified amoxicillin trihydrate micropowder; S2: Mixing the surface-modified amoxicillin trihydrate with a filler; S3: Fluidized bed granulation, including spray granulation using aqueous ethanol as a wetting agent followed by drying; S4: Granulation and mixing, including granulating the dried particles and then adding a disintegrant, a flow aid, and a lubricant; S5: Capsule filling, including capsule filling with controlled ambient humidity. This invention achieves the goals of maintaining the crystal stability of amoxicillin trihydrate, inhibiting hydrothermal degradation, and ensuring dissolution behavior consistent with the original drug by combining wet ball milling of hydroxypropyl methylcellulose E5 with spray drying for surface modification, fluidized bed granulation with aqueous ethanol, and controlling the humidity of the filling environment.

This invention provides a spherical aluminum nitride powder with narrow particle size distribution and good flowability, and its preparation method, belonging to the field of spherical powder preparation technology. The preparation method of the spherical aluminum nitride powder includes the following steps: (1) dissolving ammonium polyacrylate and citric acid in an ethanol aqueous solution, then mixing nano-alumina powder and carbon powder at a weight ratio of 72-76:24-28 and adding them to the above solution to prepare a slurry; (2) spray granulating the slurry obtained in step (1) at 100-120℃ to obtain a precursor; (3) sintering the precursor under a nitrogen atmosphere at a pressure of 0.1-0.4 MPa and a sintering temperature of 1650-1700℃ for 2 hours to obtain spherical aluminum nitride powder. The spherical aluminum nitride powder prepared by this invention has the characteristics of narrow particle size distribution, high sphericity, good sphericity, good flowability and resistance to deformation, and has better application prospects in the field of filler materials.

This invention belongs to the field of metal coating technology, and relates to a laser cladding ceramic particle-reinforced aluminum-based cladding layer and its preparation method. The preparation method includes: mixing nano-TiN particles with a pyrolysis initiator in a volatile solvent, followed by a first-stage spray granulation and low-temperature curing treatment to obtain energy-carrying ceramic particles; mixing aluminum-based alloy powder with the energy-carrying ceramic particles and a composite slurry, followed by a second-stage spray granulation to obtain spherical composite powder; cladding the spherical composite powder onto the surface of an aluminum alloy substrate that has undergone three-step chemical pretreatment; the composite slurry contains modified paraffin wax, polyvinyl butyral, and hexagonal boron nitride; the modified paraffin wax is prepared by heating and melting the paraffin wax, then adding petroleum resin and ethylene-vinyl acetate copolymer, and stirring and reacting under nitrogen protection. This invention solves the problem of simultaneously achieving high hardness, wear resistance, and crack resistance in aluminum-based cladding layers.

This utility model provides a centrifugal spray granulation device for apple polyphenols, relating to the field of spray granulation technology. It includes: a cylinder; at least three spray granulation mechanisms disposed within the cylinder, each spray granulation mechanism spraying granules onto the inner wall of the cylinder; a drying mechanism disposed outside the cylinder to dry the contents of the cylinder; and an adjusting mechanism to adjust the distance between the spray granulation mechanisms and the inner wall of the cylinder. According to this utility model, the spraying range and spray thickness of the spray granulation mechanisms are adjusted by the adjusting mechanism, allowing the spray granulation mechanisms to be adjusted according to the environment or the desired coating thickness. This enables the spray granulation mechanisms to maintain different angles relative to the inner wall, thereby changing the spraying range and adjusting the thickness of the sprayed coating accordingly, thus improving work efficiency.