67results about How to "High sphericity" patented technology

The invention provides a preparation method of a high-rate and high-sphericity lithium iron phosphate positive electrode material, which comprises the following steps: weighing iron phosphate and a lithium source according to a certain proportion, dispersing in pure water, and mixing and sanding to obtain slurry A; under a stirring condition, adding a small amount of fluorine source into the slurry A to obtain lithium fluoride doped slurry B; and under the stirring condition, adding an organic carbon source into the slurry B to prepare an electrostatic spinning solution C, and drying and calcining at high temperature to obtain the high-rate and high-sphericity lithium iron phosphate composite positive electrode material. The preparation method comprises the following steps: synthesizing a lithium fluoride doped stock solution through an in-situ reaction of a fluorine source and a lithium source, and preparing a uniformly doped precursor through electrostatic spinning; the generated lithium fluoride is used as a fluxing agent to promote the formation of high-sphericity lithium iron phosphate in the sintering process; and meanwhile, the doping of fluorine ions weakens the interaction between Li and O, so that the lithium ions can be separated / embedded in a bulk phase during charging and discharging, and the conductive carbon layer is rich in lithium fluoride, so that the migration efficiency of the lithium ions at a positive electrode / electrolyte interface is improved.

The invention discloses a barium titanate coated Ni particle material synthesized under the assistance of a spray drying technology and a method thereof, and belongs to the technical field of metal powder material preparation. The method comprises the following steps: firstly, taking metatitanic acid and barium hydroxide as raw materials, and mixing the metatitanic acid and the barium hydroxide with nano and submicron Ni powder to prepare a mixed solution; secondly, synthesizing a Ni-based composite material intermediate by adopting a spray drying method; and finally, sintering in a tubular furnace to form the barium titanate coated Ni powder. The barium titanate coated Ni inner electrode material is Ni coated BaTiO3 spherical particles with a core-shell structure, the particles are of a core / shell microstructure, a shell layer is a barium titanate coating layer with the thickness of 10-15 nm, and the particle size of the particles is 100-150 nm. According to the method, required equipment can be scaled, components and microstructures are easy to regulate and control, and the method has high sphericity and dispersity, high compactness and good repeatability; the particle size and distribution can be changed by adjusting process parameters; meanwhile, good interface bonding with a ceramic dielectric layer is realized, and the key problems of mismatching of interlayer interface volume shrinkage, easy cracking and the like in the sintering process are relieved.

A method for preparing spherical aluminum hydroxide micropowder includes the following steps: A sodium aluminate solution A is prepared by mixing aluminum hydroxide and sodium hydroxide; after heating, a self-made polyvinylpyrrolidone-g-polysiloxane additive is added, and the mixture is continuously heated and stirred to form solution B; sodium bicarbonate is then added and the reaction is continued with stirring; after the reaction is complete, the mixture is filtered while hot to obtain the filtrate, which is solution C; solution C is heated under stirring conditions, and after the reaction is complete, the temperature is lowered at a certain rate to obtain a mixed product; the mixed product is filtered, washed, and dried to obtain spherical aluminum hydroxide. The spherical aluminum hydroxide prepared by this method has a regular morphology and concentrated particle size distribution, with a D50 of approximately 7-10 micrometers. Compared with irregularly shaped aluminum hydroxide of the same particle size, it has better filling performance, effectively improving the problems of poor dispersibility and high viscosity caused by high filling of aluminum hydroxide in polymer materials, and improving the subsequent processing performance of the material.

This invention belongs to the field of electronic packaging and soldering materials technology, and relates to a lead-free solder powder for reflow soldering and its preparation method. This lead-free solder powder is based on a Sn-Ag-Cu alloy system, and achieves melt purification, β-Sn grain refinement, and interface IMC stabilization by adding trace amounts of Ce and Ni elements. Its composition, by mass percentage, is: Ag 2.9%–3.1%, Cu 0.45%–0.55%, Ce 0.01%–0.10%, Ni 0.01%–0.05%, with the balance being Sn and impurities. During preparation, a Ce-Ni master alloy is used to introduce microalloying elements, followed by vacuum melting, inert gas atomization, and surface treatment to obtain spherical solder powder. The resulting solder powder has low oxygen content, good wettability, slow interface IMC growth after reflow, high solder joint strength, and excellent thermal cycling reliability, making it suitable for high-reliability electronic packaging applications.

The application belongs to the technical field of polymer materials, and particularly relates to a nylon powder and a preparation method and application thereof. The nylon powder comprises high-viscosity nylon resin, low-viscosity nylon resin and an additive, wherein the relative viscosity of the high-viscosity nylon resin is 1.75-1.85, the relative viscosity of the low-viscosity nylon resin is 1.55-1.65, the mass ratio of the high-viscosity nylon resin to the low-viscosity nylon resin is 10:1-3, and the additive comprises an antioxidant. The high-viscosity nylon resin and the low-viscosity nylon resin with specific viscosities are compounded and used in proportion, the high-viscosity nylon resin serves as a skeleton of a hydrogen storage bottle inner container and provides mechanical property support, and the low-viscosity nylon resin provides fluidity and ensures few defects in bottle forming. The use of the nylon powder of the application improves the mechanical property of the hydrogen storage bottle inner container and the integrity of the inner container structure, and a stable and defect-free type IV nylon hydrogen storage bottle inner container is prepared.

The invention provides spherical copper oxide water atomization production equipment and a preparation process thereof, and relates to the technical field of copper oxide preparation, firstly, a medium-frequency induction smelting furnace is used for smelting and pre-oxidizing a copper material, and then an atomization tower and a porous rotary damping spray head in the atomization tower are used for carrying out water atomization crushing and oxidation on molten copper; and then a rotational flow dehydrator and an airflow drying tower are used for dehydration and deep oxidation. Copper liquid pollution is prevented through nitrogen whole-process protection and smelting segmented oxidation, the rotating speed of the porous rotary damping spray head is stabilized through wavy concave-convex structure embedment and constant damping design of ball groove bearing balls, and particle aggregation and nozzle deposition are avoided in combination with pulse type intermittent jet flow. The copper oxide powder with high sphericity, uniform granularity and pure surface is obtained, the production efficiency of spherical copper oxide is improved, the service life of a nozzle is prolonged, and energy consumption is reduced.

The invention relates to the technical field of high-activity metal powder, in particular to high-environmental-stability aluminum-lithium alloy powder and a manufacturing method and application thereof.The high-environmental-stability aluminum-lithium alloy powder comprises, by weight, 1.0-10.0 wt.% of Li, 1.0-10.0 wt.% of Al, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0- 0.1 to 5.0 wt.% of Zr; 0.01 to 2.0 wt.% of Ti; 0.05 to 3.0 wt.% of RE; wherein RE is a rare earth element and at least comprises Y, Ce, La or a combination thereof, the sum of Zr, Ti and RE does not exceed 8.0 wt.%, and the balance is Al and inevitable impurities. The method has the effect of improving the use stability and the machining consistency of the aluminum-lithium alloy powder.

The application provides a silicon-carbon composite negative electrode material and a preparation method and application thereof, and belongs to the technical field of new energy materials and electrochemistry. Silicon powder and metal oxide are tightly combined through sand milling to build a continuous and stable structure, the volume expansion of the silicon powder and the metal oxide is inhibited, the stress of the silicon powder is released, then the sand-milled composite slurry is mixed with carbon material, and spray drying granulation and carbonization treatment are performed to prepare the negative electrode material. Based on the mutual stability effect, the application can accommodate and relieve the large volume expansion of the silicon material, and the stability of the material is maintained. The prepared composite negative electrode shows extremely low volume expansion (<20%). The metal oxide in the application has the ability to stabilize the SEI film and improve the conductivity. In combination with the addition of the carbon material, the conductivity of the composite material is synergistically improved, and the electrochemical performance is improved. Therefore, the prepared composite material has high sphericity, high tap density and excellent electrochemical performance.

The invention belongs to the technical field of inorganic materials, and particularly relates to a preparation method of high-purity barium carbonate. High-purity barium carbonate is prepared from a barium chloride solution and an ammonium bicarbonate solution through a coprecipitation method, a crystal form control agent is added into the barium chloride solution in advance, and a surfactant is added into the ammonium bicarbonate solution, so that an auxiliary agent is adsorbed to a potential crystal nucleus site in advance, the liquid phase interfacial tension is reduced, and the uniformity of a barium carbonate precipitation reaction is ensured; hyperbranched polycarboxylic acid and tartaric acid are compounded to form a crystal form control agent, polyacrylic acid and citric acid are compounded to form a composite dispersing system, the crystal form control agent, a surfactant and a composite dispersing agent are added, and the pH value in the reaction process is controlled, so that the prepared barium carbonate has higher purity and sphericity and narrower particle size distribution.

This invention provides a spherical TC4 alloy fine powder, its preparation method, and its application, belonging to the field of alloy material preparation technology. The preparation method of the spherical TC4 alloy fine powder includes the following steps: S1: Hydrogenation pre-crack formation, using spherical TC4 coarse powder particles as raw material, heating to 700~1000℃ in a hydrogen atmosphere, and holding at that temperature for 20~90 min; S2: Preparing spherical TC4 titanium alloy powder using radio frequency plasma hydrogen explosion; the hydrogen explosion gas includes hydrogen and inert gas; S3: After ultrasonic separation of the spherical TC4 titanium alloy powder from step S2, the spherical TC4 alloy fine powder is obtained. This achieves an integrated technical route of TC4 powder refinement and hydrogen explosion spheroidization, obtaining MIM powder with high sphericity and high flowability.

The application belongs to the technical field of lithium ion battery ternary precursors, and particularly relates to a high specific surface area high-nickel ternary precursor oxide as well as a preparation method and application thereof. The high specific surface area high-nickel ternary precursor oxide prepared by the method has a larger specific surface area, which can reach 180.19 m 2 / g, a high tap density, and loose and porous particles, and has high overall consistency, and can effectively improve the electrochemical performance of the positive electrode material when the positive electrode material is prepared. By adjusting the temperature and time of the calcination process, the application effectively reduces the moisture and organic impurity content, improves the sphericity of the later forming, effectively adjusts the half-peak of the ternary precursor oxide, and controls the specific surface area. By oxidizing the loose and porous high-nickel ternary precursor hydroxide, the structure of the ternary precursor oxide prepared is more stable, and the advantage is greater in the preparation of the subsequent ternary positive electrode material.

The invention discloses a method for preparing cobalt hydroxide, comprising the following steps: (1) adding a cobalt salt solution and an ammonia solution to deionized water at 30 to 75°C, controlling the reaction system pH to 6 to 9, and obtaining α-Co(OH)2; (2) adding an antioxidant to the reaction system, continuing to heat to 75 to 100°C, and keeping warm for 4 to 16 hours to obtain β-Co(OH)2; (3) aging, filtering, and taking a filter residue to obtain the cobalt hydroxide. The cobalt hydroxide prepared by the method for preparing cobalt hydroxide of the present invention has the characteristics of narrow particle size distribution range, high sphericity, high purity, and large bulk ratio. The method of the present invention is simple in process and easy to operate. There is no need to add strong alkali sodium hydroxide in the reaction, and there is no need to consume a large amount of water in the washing process caused by adding sodium hydroxide to cause the product to contain more sodium salts. The cobalt hydroxide slurry is easy to wash and has good process safety.

This invention relates to a stabilizer for preparing polycaprolactone and its application. The stabilizer is an asymmetric block copolymer comprising polycaprolactone segments and carbonyl-dependent segments, with an anchor-to-solubility ratio of 0.5 to 5.0, wherein the anchor-to-solubility ratio is the ratio of the number-average molecular weight of the carbonyl-dependent segments to that of the polycaprolactone segments. When the stabilizer of this invention is used to prepare polycaprolactone, polycaprolactone microspheres with controllable particle size range, narrow particle size distribution, and high sphericity can be obtained.

The invention discloses a multi-channel micro-fluidic chip and a preparation method of monodisperse chitosan microspheres in the multi-channel micro-fluidic chip, and belongs to the technical field of chitosan microsphere preparation, the multi-channel micro-fluidic chip comprises an upper layer substrate, a middle layer substrate and a lower layer substrate, and further comprises a continuous phase channel assembly, a disperse phase channel assembly and a microsphere collection assembly, the upper-layer substrate, the middle-layer substrate and the lower-layer substrate are fixedly connected in sequence from top to bottom, the upper-layer substrate is connected with a continuous phase channel assembly, the middle-layer substrate is connected with a dispersed phase channel assembly, the lower-layer substrate is connected with a microsphere collecting assembly, and the continuous phase channel assembly, the dispersed phase channel assembly and the microsphere collecting assembly are connected with one another. Through the mode, the monodisperse chitosan microspheres with uniform size and controllable morphology can be prepared.

The invention discloses a preparation method of a large-particle ternary precursor with high sphericity degree and low tap density, which comprises the following steps: S1, introducing N2 into a first reaction base solution, simultaneously introducing a ternary solution and a regulating solution, and carrying out first-stage reaction to obtain first slurry; s2, adjusting the introduction flow of the ternary solution and the adjusting solution, and carrying out a second-stage reaction to obtain a second slurry; s3, washing and dehydrating the second slurry to obtain a seed crystal; s4, introducing N2 into the second reaction base solution, then adding a seed crystal, heating and stirring to obtain a seed crystal mixture; s5, introducing the ternary solution and the adjusting solution into the seed crystal mixture, and carrying out a step-by-step stirring reaction to obtain slurry; s6, aging, washing, dehydrating and drying the slurry to obtain a large-particle ternary precursor with high sphericity degree and low tap density; according to the preparation method, the high-nickel ternary precursor with high sphericity, low tap density and no cracking is obtained through the steps of firstly synthesizing the seed crystal and then carrying out grain growth, and adjusting condition parameters of each stage.

The application provides SiC-ZrC-HfC composite powder for thermal spraying and a preparation method thereof, and belongs to the technical field of ultra-high-temperature ceramic powder.The SiC-ZrC-HfC composite powder prepared by the application has the characteristics of high uniformity of three components, narrow grain size distribution and good interface bonding, and the powder has high sphericity and good fluidity, and is suitable for thermal spraying process.The composite powder exhibits excellent ablation resistance and oxidation resistance at high temperatures, can meet the stringent requirements of aerospace field thermal protection components such as hypersonic aircraft, space shuttles and reusable launch vehicles, and simultaneously uses biomass carbon to partially replace graphite, thereby reducing production cost and energy consumption, reducing environmental pollution and having significant industrial application value.

The invention discloses a ternary single crystal positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of battery materials. The preparation method of the ternary single-crystal positive electrode material comprises the following steps: mixing a ternary positive electrode material precursor with a first lithium salt, and carrying out first sintering to obtain a first sintered material; mixing the first sintering material with a second lithium salt, and carrying out second sintering; the ratio of the molar weight of Li in the first lithium salt to the total molar weight of metals in the ternary positive electrode material precursor is 0.6: 1 to 0.85: 1; the ratio of the total molar weight of Li in the first lithium salt and Li in the second lithium salt to the total molar weight of metal in the ternary positive electrode material precursor is 1.05: 1. The method is simple to operate, the sphericity and the tap density of the ternary single crystal positive electrode material can be effectively improved by adopting two times of lithium supplementation and controlling the lithium ratio of each time of lithium supplementation, so that the volume energy density of the material is further improved, and the specific capacity and the cycle performance of a battery prepared from the positive electrode material are favorably improved.

The invention discloses a degradable embolism microsphere and a preparation method thereof, and belongs to the technical field of medical treatment. A PVA aqueous solution with the viscosity of 500-2500mm < 2 > / s is added into an oil phase, a cross-linking agent and a basic catalyst are added, stirring and dispersing are carried out, so that PVA and the cross-linking agent are subjected to a cross-linking curing reaction under the catalytic action of the basic catalyst, the degradable embolization microspheres are formed, the size and morphology uniformity of the microspheres is improved, the balling quality is improved, and the degradable embolization microspheres are obtained. Therefore, the treatment effect and the safety of the degradable embolism microspheres are improved.

The present invention discloses a method for preparing a high-nickel polycrystalline ternary precursor. The method can realize the step-by-step and hierarchical growth of particle size by adopting a multi-step seed preparation process, showing characteristics similar to a core-shell structure. At the same time, the first two stages of the process are controlled at medium and low temperatures, and the temperature of the last stage of growth is maintained at a high temperature, so that a precursor with good particle dispersion, uniform primary particles, obvious internal radial structure and clear layered contours can be obtained.

The invention provides a polymer microsphere as well as a preparation method and application thereof. The polymer microspheres contain a first polyester material and a second polyester material, the first polyester material is polyester modified by a hydrophilic substance, and the second polyester material is polyester not modified by the hydrophilic substance; the polymer microsphere has a through pore channel structure, the through pore channel structure forms pores in the surface of the polymer microsphere, and the interior of the polymer microsphere is of a porous honeycomb structure. When the polymer microsphere provided by the invention is used as an organism filling agent, the polymer microsphere has a good adhesion effect on cells, better cell adhesion can be realized, and collagen secretion is improved; meanwhile, the through pore channel structure enables body tissues to grow more uniformly in the microspheres and strengthens the combination of the tissues and the polymer microspheres, so that the polymer microspheres are not easy to displace after being injected and in the later degradation process, and the safety is improved.

The application discloses a silicon nitride-aluminum nitride-based composite ceramic powder and a preparation method thereof. The preparation method of the composite ceramic powder comprises the following steps: preparing aluminum borate precursors and / or borate composite precursors by using a solid-phase reaction method; placing the prepared aluminum borate precursors and / or borate composite precursors in a high-temperature furnace; and performing a high-temperature nitriding reaction under a nitrogen or ammonia atmosphere to prepare binary or multi-element aluminum nitride-aluminum oxide composite powder. Then, the binary or multi-element aluminum nitride-aluminum oxide composite powder is combined with high-thermal-conductivity and high-strength silicon nitride-based spherical powder by airflow compounding to prepare the silicon nitride-aluminum nitride-based composite ceramic powder. The borate precursor solid-phase synthesis, one-step in-situ nitriding and airflow compounding process can be used to prepare the silicon nitride-aluminum nitride-based composite ceramic powder which can be applied to 6-35KV medium and high-voltage electric heating tubes. The process is free of carbon source and organic additive addition in the whole process, and complex processes such as hydrothermal treatment and spray granulation are abandoned, and the comprehensive production cost is reduced by 60%.

The present invention discloses a high-nickel large-particle ternary precursor and a preparation method thereof, belonging to the technical field of lithium-ion batteries. The ternary precursor has a chemical formula of Ni x Co y Mn (1‑x‑y) (OH)2, where 0.90 ≤ x < 0.98 and 0 < y < 0.05. The D50 of the high-nickel large-particle ternary precursor is 14 - 16 μm, the specific surface area is 23 - 40 m 2 / g, and the tap density is 1.7 - 2.1 g / cm 3 . The primary particles of the high-nickel large-particle ternary precursor are slender, and the secondary particles are loose and porous. The length of the primary particles ≥ 600 nm, and the diameter of the primary particles ≤ 31 nm. The high-nickel large-particle ternary precursor of the present invention has a large specific surface area, a high tap density, slender and small-sized primary particles, loose and porous secondary particles, and high overall consistency. When preparing the cathode material, it can effectively improve the electrochemical performance of the cathode material.

The material for a ceramic ball according to an embodiment of the present invention has a spherical surface section and a band-shaped section that is formed in the shape of a band. The material for a ceramic ball is characterized by having a roundness C in the range of more than 0% but not more than 2.5%, where C represents a roundness as observed from the height direction of the band-shaped section. When the material for a ceramic ball is subjected to a grinding process, the durability of the sharpening stone can be improved. In addition, at least one of aluminum oxide, silicon nitride, boron nitride, and zirconium oxide is applicable as the ceramic.

The present application relates to the technical field of preparation of tritium breeder, in particular to a method for batch preparation of Li2TiO3 tritium breeding microspheres and rich phase structure by centrifugal granulation, comprising the following steps: S1, Li2TiO3 ceramic powder is pretreated by spray granulation, then sprayed with a solution of xanthan gum for granulation, and sieved to obtain a green body; S2, the green body is added into a centrifugal granulator, and a second binder solution is sprayed at the same time, so that Li2TiO3 microsphere seeds with a preset diameter are generated by centrifugal granulation; S3, then the second binder solution is sprayed while lithium-containing ceramic powder is added for granulation and bonding; S4, the process of S3 is repeated until ceramic microsphere green bodies with the required diameter are obtained; S5, then deionized water is sprayed in the granulator and continues to roll for 3-8 min; S6, the ceramic microspheres obtained in S5 are dried at constant temperature and humidity, degummed, and sintered. The method can realize batch preparation of high-lithium-content tritium breeding microspheres with single-phase structure or multi-phase structure.

The invention discloses a preparation method of antioxidant nano-copper particles based on an intermediate metastable state, which comprises the following two steps: firstly, reacting copper salt with a first reducing agent and a pH regulator for 10-40 minutes in a first organic solvent of 70-130 DEG C to obtain copper-based intermediate particles of 20-25 nm; and then dispersing the intermediate in deionized water, adding a second reducing agent, a pH regulator and a coating agent, reacting at 70-130 DEG C for 20-60 minutes, so that the coating agent and copper atoms are deposited and synchronously bonded in situ under an alkaline condition to form a continuous coating layer with the thickness of 4-10nm, and finally obtaining the antioxidant nano-copper particles with the particle size of 30-40nm and high sphericity through epitaxial growth control. According to the preparation method, nucleation and growth processes are accurately regulated and controlled under mild conditions, and the nano-copper particles which are uniform in particle size, high in sphericity degree and long-acting in oxidation resistance are directly prepared.

The invention discloses laser cladding metal matrix composite wear-resistant powder and a composite cladding layer, and belongs to the technical field of laser cladding composite materials. The laser cladding metal matrix composite wear-resistant powder comprises, by weight, strengthening phase adding powder and metal matrix phase powder, the strengthening phase adding powder is composed of, by weight, 3%-50% of WC powder, 5%-45% of Cr3C2-20NiCr powder and 0.2%-5% of VC powder, the total content of the strengthening phase adding powder does not exceed 60%, and the balance metal matrix phase powder. The method is used for solving the problems of selection and performance maintenance of second-phase particles in the laser cladding process, balance between the powder particle size and powder feeding smoothness, high powder preparation cost and cladding layer pore defects.

The application relates to a device for preparing metal powder based on inductive coupling thermal plasma torch, and belongs to the technical field of metal powder preparation. The device comprises a feeder, a powder feeding gun, a plasma generating device, a spheroidizing chamber and a quenching chamber. The feeder sends metal raw powder carried by inert gas into the plasma generating device through the powder feeding gun. After being heated to form metal liquid drops, the metal liquid drops enter the spheroidizing chamber to become spherical liquid drops, and then enter the quenching chamber to be cooled into spherical powder. The upper end of the quenching chamber is connected with the spheroidizing chamber, the side wall is provided with upper, middle and lower quenching channels from top to bottom, and the three quenching channels are all composed of a plurality of inclined channels which are circumferentially distributed around an axis. The first, second and third cooling gases are respectively introduced into the three quenching channels to form rotational gas flows which are perpendicular to the axis, and the inert gas content in the three cooling gases increases gradually. The application can realize better cooling effect and improve the quality of the formed powder.

This invention provides an analytical method based on CFD-DEM-PBM coupled simulation, an ultra-high nickel cathode precursor, a ternary cathode material, and a preparation method. The method includes: constructing a CFD-DEM bidirectional coupled simulation model for a reactor with a volume ≥1000 L; calculating the macroscopic flow field using RANS equations combined with a turbulence model; transferring the data to the DEM module via an Eulerian-Lagrange framework to calculate the trajectory of discrete particles in the flow field, inter-particle collision energy, and collision frequency; feeding back the calculated particle volume fraction to the CFD; introducing a population equilibrium model to select a stirrer configuration and rotation speed combination that maximizes the particle orientation index, minimizes collision energy below the critical collision energy threshold, and narrows the Span value over time, thus confirming the stirrer type and optimal rotation speed. The preparation method of this invention is simple, significantly shortens the preparation cycle of the ultra-high nickel cathode precursor, and has broad application prospects.

The invention provides a preparation method of water-resistant spherical aluminum nitride-boron nitride composite powder. The preparation method comprises the following steps: heating a boron source, an aluminum source, a carbon source, an alkaline nitrogen source and distilled water in a reaction kettle for reaction to obtain aluminum nitride-boron nitride precursor slurry; then, uniformly mixing the aluminum nitride-boron nitride precursor slurry with yttrium aluminate, and performing spray granulation to obtain a spherical aluminum nitride-boron nitride precursor; then putting the spherical aluminum nitride-boron nitride composite powder into an atmosphere furnace for melting and calcining under a protective atmosphere to obtain spherical aluminum nitride-boron nitride composite powder; and finally, modifying through a coupling agent and resin to obtain the water-resistant spherical aluminum nitride-boron nitride composite powder. The powder has the advantages of higher sphericity, uniform particle size distribution, smooth surface, compact structure and excellent flowability and dispersity; the resin coating layer effectively improves the hydrolysis resistance of the powder, and enhances the long-term stability and reliability of the powder.

This invention discloses a high-purity ultrafine spherical silica powder, its production method, and its application, belonging to the technical field of high-value mineral material preparation and high-value utilization of industrial solid waste. The preparation method includes: flotation and acid washing of silica mud to obtain purified silica powder; air jet milling and air jet classification of the purified silica powder to obtain ultrafine silica powder; and feeding the ultrafine silica powder into a plasma reactor in the presence of an oxygen-containing flow, causing simultaneous oxidation and spheroidization to obtain high-purity ultrafine spherical silica powder. The oxygen volume concentration in the oxygen-containing flow is 25-60%; the ratio of the input power of the plasma reactor to the powder feeding rate of the ultrafine silica powder is 15 kWh / kg-50 kWh / kg. Based on the material characteristics of silica mud, this method achieves high-value utilization of silica mud through the synergistic regulation of pretreatment purification, precise particle size control, and energy-coupled spheroidization throughout the entire process, while possessing advantages such as low energy consumption, uniform product particle size, high purity, and good sphericity.