79 results about "Particle size ratio" patented technology

A glass powder surface gradient activation-asphalt interface bonding enhancement technology is created for the first time, and the industry bottleneck that the compatibility of waste glass and asphalt is poor is broken through. The core of the method comprises the following steps: 1, an original pretreatment process: carrying out three-stage crushing, wet magnetic separation (the magnetic field intensity is 1.2 T), plasma etching (the ratio of Ar to O2 is 4: 1, and the power is 800W) and controllable ball milling (zirconium oxide balls are used for ball milling) on waste glass; according to interface molecular engineering, a bifunctional silane coupling agent (KH-792: gamma-aminoethyl aminopropyl trimethoxy silane) and titanate (NDZ-201) are compounded with a modifying agent (the mass ratio is 3: 1), and a-Si-O-Ti-cross-linked network 3 is constructed on the surface of the glass powder through in-situ hydrolytic condensation. According to mixture collaborative design, mineral powder is replaced by 35-55% of activated glass powder, and the particle size ratio of the activated glass powder to the mineral powder is 1: 2, D90 is smaller than or equal to 20 [mu] m < 2 >, D90 is smaller than or equal to 20 [mu] m < 2 >, and D90 is smaller than or equal to 20 [mu] m < 2 >. The technical effect of forming a core-shell structure reinforced phase in the SBS modified asphalt is as follows: the dynamic stability reaches 5032 + / -210 times / mm (JTGE20-2011T0719), and compared with the traditional mixture, the water sensitivity (TSR) is improved by 79.7% from 81.3% to 96.5%.

The invention discloses a high-specific-gravity and high-toughness tungsten-nickel-copper material and a preparation method thereof, and belongs to the technical field of non-ferrous metal materials. The material comprises the following components in percentage by mass: 6-15% of nickel; 2-5% of copper; 2-5% of manganese, and the balance tungsten and inevitable impurities. The preparation method of the material comprises the following steps: preparing materials (pure tungsten powder, pure nickel powder, pure copper powder and pure manganese powder), mixing the powder, pressing, sintering, and carrying out recrystallization annealing heat treatment. In the burdening step, two kinds of tungsten powder with different particle size grades are selected and added, and the gradient particle size ratio is adjusted. By adding the strengthening element manganese, combining the gradient particle size ratio and enhancing interface bonding, the high specific gravity and high strength of the material are kept, meanwhile, excellent toughness can be kept, and the material is suitable for aerospace gyroscope rotors and balance weight parts, electronic industry precise instrument parts, medical instrument ray shielding materials and national defense military industry kinetic energy armor-piercing weapon parts.

The invention provides a single-layer core-shell structure polishing abrasive for silicon carbide wafer polishing, a polishing solution, a preparation method and a polishing method, and relates to the technical field of chemical mechanical polishing, the single-layer core-shell structure polishing abrasive takes silicon dioxide with the particle size of 300-800 nm as an inner core and aluminum oxide with the particle size of 10-150 nm as an outer shell, the particle size ratio of the inner core to the outer shell is 2: 1-10: 1, and the polishing solution is prepared from silicon dioxide with the particle size of 300-800 nm and aluminum oxide with the particle size of 10-150 nm. And single-layer coating is realized through cationic polyelectrolyte assisted electrostatic adsorption. The polishing solution comprises the following components in parts by weight: 3-15 parts of a polishing abrasive with a single-layer core-shell structure, 0.2-8 parts of an oxidizing agent, 0.1-8 parts of a dispersing agent and the balance of deionized water, and the pH value is adjusted to 8-11. The hardness of the inner core abrasive material of the prepared polishing abrasive material with the core-shell structure is smaller than that of the outer shell abrasive material, the polishing abrasive material with the core-shell structure has high dispersity and low agglomeration rate, in the final polishing process of SiC wafers, the surface roughness Ra smaller than or equal to 0.15 nm can be obtained, meanwhile, the material removal rate is kept to be larger than or equal to 1500 nm / h, the scratch density is remarkably reduced, and the polishing abrasive material is suitable for batch finish machining of high-end power device substrates.

The invention provides low-temperature base metal conductive paste and a preparation method and application thereof.The low-temperature base metal conductive paste comprises 86 wt%-90 wt% of a conductive phase, 3 wt%-6 wt% of resin, 0.1 wt%-0.5 wt% of a curing agent, 0.1 wt%-1 wt% of a dispersing agent, 0.1 wt%-3 wt% of an antioxidant, 0.8 wt%-1.4 wt% of an anti-settling agent and the balance solvent, the conductive phase comprises 30-60 wt% of first-class tin-coated copper powder, 10-30 wt% of second-class tin-coated copper powder and 30-60 wt% of pure copper powder, the first-class tin-coated copper powder is spheroidic and / or blocky and has an average particle size D1, the second-class tin-coated copper powder is flaky and has an average particle size D2, the pure copper powder has an average particle size D3, and D1 / D2 is larger than or equal to 0.5 and smaller than or equal to 1, and D1 / D3 is larger than or equal to 6 and smaller than or equal to 16.7. The tin-coated copper powder with different morphologies is matched according to a specific mass ratio and a specific particle size ratio and is further compounded with the pure copper powder according to a ratio, so that a conductive phase system with dense powder accumulation is formed, the electrode resistivity is reduced, metal silver does not need to be used, the dependence of conductive paste on a conductive network formed by silver powder is eliminated, and the remarkable cost reduction effect is achieved.

This invention provides a brazing filler metal, a brazing filler metal preparation method, and a rectifier brazing method. The brazing filler metal includes a first brazing filler metal and a second brazing filler metal. The brazing filler metal preparation method involves uniformly mixing high-temperature alloy powder and brazing binder at a mass ratio of 2:1 to 3:1 to form the first brazing filler metal; and uniformly mixing BNi2 powder and brazing binder at a mass ratio of 10:1 to 15:1 to form the second brazing filler metal. By specifying brazing filler metals with a specific particle size ratio and applying different types of brazing filler metals in different zones, defects such as incomplete welding and porosity that are difficult to control in large-gap welds during processing and assembly are solved, improving the welding quality of welds with both large and small gaps, thereby increasing the product qualification rate.

The application discloses high-efficiency aerobic granular sludge and a preparation method and application thereof, and belongs to the technical field of biological wastewater treatment. The application provides high-efficiency aerobic granular sludge and a preparation method thereof. The granular sludge is prepared by taking dewatered sludge with a water content of 60-75% in a wastewater plant as a raw material, and through steps of mud cake crushing, particle size screening, specific gravity air selection and elutriation activation, and has different particle sizes, a specific gravity of 1.04-1.10, a sphericity coefficient of 0.75-0.95, a consistency of 0.50-0.65 and a diameter distance of 1.05-1.50, so that the AGS system can be rapidly started. The high-performance granular sludge can be prepared only by simple processing operation. It has been verified that the granular sludge prepared by the application is added to an aerobic reactor, which helps to achieve the target requirements of rapid starting and stable operation of the AGS system.

This invention provides a low-cost, bimodal particle size distribution titanium-based powder for additive manufacturing, titanium-based parts, and a method for preparing the same. The method utilizes two different medium particle sizes D... 50 Using near-spherical titanium-based powder as raw material, a near-spherical bimodal particle size distribution titanium-based powder with good uniformity is obtained by wet mixing of suspension and rotary degreasing in a furnace. Various near-spherical bimodal particle size distribution titanium-based powders can also be prepared. The difference between these powders lies in the different particle size ratios and mass ratios of the two raw material powders used. The bulk density and flowability of each bimodal powder are tested to determine the range of particle size ratios and mass ratios of the two powders in near-spherical bimodal particle size distribution powders with high bulk density and flowability. This guides the preparation of high-quality near-spherical bimodal particle size distribution titanium-based powders for additive manufacturing. Ultimately, additive manufacturing technology is used to prepare high-performance, low-cost titanium-based parts to meet the stringent performance requirements of titanium components in high-end fields such as aerospace.

The present application provides a kind of polyurethane foam of wide frequency range sound absorption.The polyurethane foam of wide frequency range sound absorption includes polyurethane matrix and the porous polyurethane microsphere of bimodal distribution of particle size dispersed therein, the porous polyurethane microsphere is prepared by incomplete reverse emulsification method, its particle size presents bimodal distribution, the particle size ratio of large particle size porous microsphere and small particle size porous microsphere is 2:1~10:1, and the total mass ratio of large particle size porous microsphere and small particle size porous microsphere is 0.5:1~4:1.The present application is dispersed by bimodal distribution of porous polyurethane microsphere in polyurethane foam material, so as to obtain the polyurethane foam sound absorption material of wide frequency range, and the method process is simple.

The invention discloses an armored sand-ceramsite bimodal proppant based on performance matching as well as a preparation method and application thereof, and relates to the technical field of oil and gas exploitation. The proppant comprises ceramsite and armored sand which are compounded according to the mass ratio of (20: 80)-(60: 40), the volume density ratio of the ceramsite to the armored sand is 0.9-1.1, the median particle size ratio of the ceramsite to the armored sand is 1.5-3.0, it can be ensured that the proppant is evenly and stably conveyed to a target crack, the ceramsite forms a bearing framework, gaps are filled with the armored sand, and a synergistic and stable composite supporting structure is constructed. According to the proppant, the four-in-one performance matching design of volume density, breakage rate, acid solubility and particle size is adopted, the obtained proppant is superior to a conventional proppant in breakage resistance, acid corrosion resistance and long-term flow guide performance, the preparation cost is low, the defects of performance mismatch, system failure and the like of the conventional proppant can be overcome, and the proppant has wide application prospects in hydraulic fracturing construction of oil and gas fields.

To enable stable and inexpensive provision of highly dense, highly heterogeneous sintered particles for radiation shielding materials.SOLUTION: Sintered particles for radiation shielding material are provided for radiation shielding tools, the sintered particles being produced by using LiF, or LiF mixed with one or more fluorides selected from MgF2, CaF2, NaF, AlF3, and / or BaF2, to form spheres with a particle size ratio of 1.2 or less and sintering the spheres.SELECTED DRAWING: Figure 2

The invention discloses a formula design and a preparation method of high-permeability soft magnetic composite powder, and the high-permeability soft magnetic composite powder comprises the following components in parts by weight: 20-30 parts of amorphous magnetic powder with D50 distribution of 25 [mu] m; 70-80 parts of carbonyl iron powder, wherein D50 distribution is 9 [mu] m; the adhesive is composed of epoxy resin, an anhydride curing agent and gamma-aminopropyltriethoxysilane, the anhydride curing agent accounts for 20% of the weight of the adhesive, the gamma-aminopropyltriethoxysilane accounts for 6.7% of the weight of the adhesive, and two molecular ends of the gamma-aminopropyltriethoxysilane are chemically bonded with hydroxyl on the surface of the magnetic powder and the epoxy resin respectively; the particle size ratio of the amorphous magnetic powder to the carbonyl iron powder is controlled to be (2.5-3): 1. According to the formula design, the magnetic powder with a specific proportion and a specific particle size ratio is mixed, and a special adhesive is matched to enhance the interface bonding force, so that the defect of single magnetic powder is overcome.

The present invention discloses a high-strength diamond-boron carbide composite ceramic material and a preparation method thereof. The preparation method comprises the following steps: preparing a powder raw material, molding, degreasing, and siliconizing and sintering. The powder raw material preparation comprises: using diamond powder and B4C powder as raw materials, adding a binder, mixing the raw materials, and drying to obtain a mixed material. The diamond powder comprises diamond micropowder and diamond nanopowder. The particle size of the diamond micropowder is 5 to 100 μm, the particle size of the diamond nanopowder is 5 to 500 nm, and the particle size of the B4C powder is 50 to 300 μm. The particle size ratio of the diamond micropowder, diamond nanopowder, and B4C powder is 1:(0.001 to 0.02):(3 to 10). By controlling the particle size range and particle size ratio of the diamond powder and the boron carbide powder and adopting a specific method for preparing the powder raw material, the present invention can effectively improve the powder fluidity and reduce friction, and also reduce the impact of the siliconizing reaction on the performance of the ceramic material.

The invention belongs to the technical field of water purification filtering materials, and particularly relates to a degerming carbon rod as well as a preparation method and application thereof. The degerming carbon rod comprises first active carbon particles, second active carbon particles, a metal oxide, a polyethylene binder and a bacteriostatic agent. The ratio of the D50 particle size of the first activated carbon particles to the D50 particle size of the second activated carbon particles is (1.2-3.0): 1; the ratio of the D50 particle size of the second active carbon particles to the D50 particle size of the metal oxide is (1.2-5.0): 1; the D50 particle size of the metal oxide is 20-50 [mu] m; and the content of the metal oxide in the degerming carbon rod is 4-8wt%. The key point of the invention is to regulate and control the D50 particle size proportion and mass ratio of the first activated carbon particles, the second activated carbon particles and the metal oxide, so that the obtained carbon rod not only has low pressure drop and high flow rate, but also has high filtration precision, high sterilization rate and high disinfection byproduct removal rate.

Embodiments of the present application provide an aluminum-based silicon carbide, a preparation method thereof, a heat dissipation member and equipment. The aluminum-based silicon carbide comprises mixed aluminum alloy particles and beta-silicon carbide particles. The beta-silicon carbide particles comprise first beta-silicon carbide particles with a D50 of 2-4 mu m and second beta-silicon carbide particles with a D50 of 6-12 mu m. The volume fraction of the first beta-silicon carbide particles in the beta-silicon carbide is 20-45%, and the volume fraction of the second beta-silicon carbide in the beta-silicon carbide is 55-80%. The beta-silicon carbide particles are spherical particles, and the sphericity of the spherical particles is greater than or equal to 0.80. The present application improves the plasticity of the obtained aluminum-based silicon carbide by adding spherical beta-silicon carbide particles with different D50 particle size ratios in the aluminum alloy.

A thermally conductive material obtained by dispersing a filler in a matrix composed of a resin. The filler includes spherical particles composed of aluminum nitride and plate-like particles composed of boron nitride. The volume ratio of plate-like to spherical particles is, for example, 0.4 to 1.5. The particle diameter ratio of the plate-like to the spherical particles is, for example, 0.05 to 0.5. The volume percent of the filler to the thermally conductive material as a whole is, for example, 73 to 93 vol %. The thermally conductive material that satisfies such conditions can develop remarkably high thermal conductivity. The thermally conductive material can be produced through a preparation step of obtaining a mixture in which spherical particles, plate-like particles, and a resin are present in a mixed manner, and a molding step of forming the mixture into a molded body. The preparation step may be performed in multiple stages.

The invention relates to the technical field of sliding bearings, in particular to a self-lubricating bearing and a preparation method and application thereof. According to the preparation method of the self-lubricating bearing, a compact copper powder transition layer and a porous copper powder buffer layer are formed by laying and sintering on a substrate supporting layer, a gradient copper powder layer with the median particle size ratio larger than or equal to 7.5: 1 and the porosity difference larger than or equal to 25% is formed, and the porous copper powder buffer layer forms the communicating aperture of 200-500 microns; carrying out thermoplastic film forming on a mixed material containing PEEK resin, whiskers, a solid lubricant and a flow modifier, and controlling the cooling speed to be 20-80 DEG C / s; and after the obtained toughened PEEK film and a gradient copper powder layer are subjected to hot-pressing compounding, 0.5-2 MPa back pressure is applied at the temperature of 150-170 DEG C, and reverse rolling welding forming is carried out. Through gradient pore structure design and molding process innovation, the problems that an existing injection molding PEEK bearing is insufficient in ductility, low in interface bonding strength and prone to cracking after being rolled back are solved.

This invention discloses a method for preparing high-entropy zirconate PVD ceramic films. The method involves first spray-granulating five rare earth oxides—nano-Sm₂O₃, nano-Eu₂O₃, nano-Tb₂O₃, nano-Dy₂O₃, nano-Lu₂O₃, and nano-ZrO₂—with zirconium oxide to obtain target raw material powder. After sieving, spherical powders with different particle size ratios are obtained. These powders are then used to fabricate target green bodies using cold isostatic pressing, followed by sintering. Finally, the high-entropy zirconate EB-PVD target is deposited onto a smooth and glossy PVD substrate using PVD technology to form a high-entropy zirconate PVD ceramic film. The high-entropy ceramic film prepared using PVD technology exhibits significantly improved high-temperature stability, capable of withstanding environments exceeding 1500℃, enhanced interfacial adhesion, and adaptability to repeated thermal cycling requirements.

Provided is a silica that exhibits a high matting property when utilized as a matting agent for a paint, and can also suppress the occurrence of cloudiness. The silica has an aggregated structure in which primary particles are aggregated, has a particle diameter ratio R represented by the following equation (1) of from 4.3 to 5.2, has an absorbance of 0.6 or less for light having a wavelength of 700 nm as an aqueous dispersion having a concentration of 1.48 mass %, and has a particle density measured with a He pycnometer of 2.18 g / cm3 or more: Equation (1) R=LD50 / CD50 (in the equation (1), LD50 represents a volume-based 50% cumulative particle diameter (μm) of the silica measured based on a laser diffraction / scattering method, and CD50 represents a volume-based 50% cumulative particle diameter (μm) of the silica measured based on a Coulter counter method).

The invention relates to the technical field of binder spray forming manufacturing, and discloses a method for regulating and controlling the surface roughness of a binder spray forming initial blank. The method comprises the following steps: acquiring a particle size reference ratio of raw material powder, preparing an initial blank by adopting a binder spray forming process according to the ratio, measuring the surface roughness of the initial blank to obtain a measured value, and comparing the measured value with a target roughness threshold value. And when the measured value is larger than the target roughness threshold value, the particle size ratio of the raw material powder is adjusted through the calculation model. And repeating the steps of preparing the initial blank, measuring the surface roughness and comparing until the measured value of the surface roughness is less than or equal to the target roughness threshold value. According to the method, accurate regulation and control of the surface roughness of the initial blank are achieved, diversified requirements of different products for the surface quality can be met, meanwhile, the method has the advantages of being efficient, low in cost and the like, and powerful support is provided for wide application of the binder spray forming technology in the manufacturing industry.

The invention discloses an automatic preparation method of high-permeability stratum shield slurry based on a deep learning model, and belongs to the technical field of high-permeability stratum shield slurry, and the method comprises the following steps: S1, designing slurry parameters by adopting an orthogonal design method, and selecting three factors of effective particle size, specific gravity and viscosity of slurry for research; the effective particle size of the slurry is prepared from pure bentonite slurry with the swelling-water ratio of 1: 12 and particle materials with different particle sizes; s2, carrying out penetration test on the prepared slurry sample in stratums with different permeability coefficients, and recording the change condition of the water filtering amount along with time, the type of a formed mud film and the thickness of the mud film; by establishing the quantitative evaluation index based on the deep learning model, the mud film performance can be accurately and objectively evaluated, and a scientific basis is provided for mud preparation. And in combination with quantitative evaluation indexes and a deep learning model, automatic optimization of the slurry formula is realized, the slurry preparation efficiency is improved, and the labor cost is reduced.

The invention discloses a pH response microcapsule dental floss and a preparation and use method thereof, and belongs to the technical field of oral care. The dental floss comprises a matrix and a color developing coating, the coating contains pH response microcapsules, the average particle size is 5-20 microns, the single-layer wall thickness is 0.5-2.0 microns, and the ratio of the wall thickness to the particle size is 0.03-0.3; the core material is a pH color-changing dye conforming to the GB / T 16886.10 standard, develops color in a plaque acid environment with the pH being less than or equal to 5.5, and automatically fades color in a neutral environment with the pH being greater than or equal to 6.8; and the wall material is a biocompatible polymer. The microcapsule is stable in saliva, is only broken and released under the friction shearing force of the dental floss, realizes the specific color development of the plaque, and disappears and is not stained after being washed with clear water. The preparation method comprises the following steps: preparing microcapsules by a complex coacervation method, preparing a coating solution, dipping and coating, and drying and sub-packaging. The dental floss is stable in storage and controllable in use, has cleaning, bacterial plaque visual detection and antibacterial functions, and remarkably improves user compliance.

To produce sintered ore having higher quality by using a mixed dry distilled material obtained by mixing iron ore with biomass and dry distilling the mixture.SOLUTION: A particle size adjustment step of adjusting the particle size of the biomass and the iron ore to a predetermined particle size, a carbonization step of carbonizing a mixture of the biomass and the iron ore having the adjusted particle size to produce a mixed carbonized product which is a mixture of a biomass carbide and a reduced ore, and a sintering step of producing sintered ore using the mixed carbonized product, wherein the predetermined particle size of the biomass is a top size of 3 mm or more and 7 mm or less, and the predetermined particle size of the iron ore is a top size of 7 mm or more and 10 mm or less, wherein a particle diameter ratio of a top size is 0.3 or more, a mass ratio of the biomass and the iron ore in the mixture is 0.2 or more, a dry distillation temperature in the dry distillation step is 700 °C or more and 900 °C or less, and a reduction rate of the reduced ore produced in the dry distillation step based on hematite is 70% or less.SELECTED DRAWING: Figure 1

The invention discloses a reactor for a sodium ion positive electrode material with high thermal shock resistance and a preparation method, and belongs to the technical field of reactors, the reactor comprises the following raw materials by weight: 20-30% of cordierite, 2-10% of talcum powder, 20-22% of mullite, 18-20% of tabular corundum, 12-18% of activated alumina, 4-8% of molybdenum trioxide, 5-6% of Guangxi white mud, 3-10% of an alumina silicate fiber fabric, and 4-8% of a binder; the binding agent is an aluminum dihydrogen phosphate solution with the concentration of 60%, and the aluminum silicate fiber fabric is subjected to high-temperature cracking treatment. According to the invention, by regulating and controlling the particle size ratio of cordierite to mullite, a compact network skeleton structure is formed in a reactor matrix, the stacking density and strength are optimized, the thermal stress is effectively dispersed, and cracks and spalling caused by temperature shock in a high-temperature repeated use process are reduced, so that the thermal shock stability of the reactor is improved.

The present application relates to aggregate gradation design method, asphalt mixture design method and pavement structure, comprising the following steps: sequentially determining the optimum dosage of each aggregate, the dosage determination method of adjacent two aggregates is: determining the average particle size ratio of fine aggregate and coarse aggregate in adjacent two aggregates; when the average particle size ratio is not greater than the set value, the first void index under a plurality of different coarse aggregate volume contents is measured, the boundary effect model is determined according to the first void index, the second void index when the coarse aggregate volume content is 100% is measured, the non-interference effect model is determined according to the second void index, and the optimum coarse aggregate dosage is determined according to the boundary effect model and the non-interference effect model; when the average particle size ratio is greater than the set value, the CBR value under a plurality of different coarse aggregate contents is measured, and the coarse aggregate volume content corresponding to the maximum CBR value is taken as the optimum coarse aggregate dosage, the aggregate gradation obtained by the design method satisfies the mineral material gap rate requirement.

The present application provides a kind of inkjet ink, ink set and image recording method capable of recording image with excellent concealment and capable of inhibiting wear and tear degradation of inkjet head.The inkjet ink contains water, titanium dioxide particles and silicon compound, the average primary particle size of titanium dioxide particles is 100 nm or more, the silicon compound is at least one selected from the group consisting of silicate and colloidal silicon dioxide, the content of silicon compound is 0.0020 mass% or more relative to the total amount of titanium dioxide particles, and the ratio of volume average particle size of colloidal silicon dioxide to the average primary particle size of titanium dioxide particles is 0.04 or less.

The application provides a high-thermal-conductivity heating element and a preparation method thereof. The high-thermal-conductivity heating element is prepared from first black silicon carbide powder, second black silicon carbide powder, flaky graphite, polyvinyl alcohol aqueous solution and a small amount of high-thermal-conductivity MgO sintering aid. The particle sizes of the first black silicon carbide powder and the second black silicon carbide powder are different, and the particle size ratio of the first black silicon carbide powder and the second black silicon carbide powder satisfies the Horsfield filling relationship. The application uses two silicon carbide powder raw materials with different particle size distributions, so that the D50 index satisfies the Horsfield filling relationship, the small-particle-size silicon carbide powder can be filled in the gaps formed by the particle accumulation of the large-particle-size silicon carbide powder, the forming density of the pressed silicon carbide heating sheet blank is improved, the requirement for realizing the densification of the heating sheet through the shrinkage of the later high-temperature sintering is reduced, the sintering temperature is reduced, and the loss of the flaky graphite in the sintering process is avoided.

The invention discloses a method for regulating and controlling the particle size gradient of calcined zircon powder for preparing precision casting slurry, which comprises the following steps: selecting zircon sand subjected to impurity removal and purification as an initial raw material, and carrying out high-temperature calcination on the zircon sand; screening the zircon sand subjected to high-temperature calcination, mixing the zircon sand with different particle size grades to obtain a zircon sand mixture with different particle size ratios, and taking the zircon sand mixture as a base material for regulating and controlling the particle size gradient of the zircon powder; performing ball milling on the zircon sand mixtures with different particle size ratios to obtain zircon powder; and the zircon powder is subjected to particle size grading and particle size regulation and control, and the zircon powder with different particle size ratios is mixed, so that accurate regulation and control of the particle size gradient of the calcined zircon powder for preparing the precision casting slurry is completed. According to the regulation and control method, the stability and consistency of the powder preparation process can be remarkably improved, and the prepared powder can meet the requirement for preparation of surface layer slurry and back layer slurry of a ceramic shell for precision casting at the same time.

The application discloses a preparation method of high-thermal-conductivity diamond composite material, and further discloses the obtained high-thermal-conductivity diamond composite material.The preparation method comprises the following steps: S1, putting transition diamond micro powder and a catalyst into a three-dimensional mixer to obtain first powder raw materials; S2, putting etched diamond particles and high-viscosity liquid into the three-dimensional mixer to obtain second powder raw materials; S3, putting the two kinds of powder raw materials into the three-dimensional mixer to mix and obtain third powder raw materials; S4, loading the third powder raw materials into a molybdenum material cup to form an assembly; S5, performing sintering reduction treatment on the assembly; and S6, putting the assembly after reduction into a six-surface press to synthesize the high-thermal-conductivity diamond composite material.The high-thermal-conductivity diamond composite material is prepared by the preparation method of the high-thermal-conductivity diamond composite material provided by the application, under the action of high temperature, high pressure and catalyst, and by optimizing the diamond particle size ratio, a good thermal conduction path is formed between the diamonds, and the diamond composite material with high thermal conductivity is prepared.

A resin composition and the use thereof. The resin composition comprises the following components, in percentages by weight: 40-70% of a crosslinkable and curable resin and 30-60% of a filler. The filler is silicon dioxide prepared by means of an organosilicone hydrolysis method; the average particle size D50 of the silicon dioxide is 0.1-3 μm; and the particle size ratio D100:D10 of the silicon dioxide is less than or equal to 2.5. By means of the composition, a prepared adhesive film and resin-coated copper foil have a higher elongation rate, a higher peel strength, low CTE, low Df, better drilling processability and higher electrical strength. A finer line processing capability can be achieved, which can be applied to a printed circuit board material of a multilayer laminate, in particular a printed circuit board material of a multilayer laminate of thin lines.

The application discloses a control method of a grinding machine group. The method comprises the following steps: acquiring a particle size ratio of target ore materials output from the second outlet of the cyclone group, the particle size of the target ore materials being less than or equal to a preset particle size threshold, the particle size ratio being a ratio between a content of the target ore materials and a content of total ore materials output from the second outlet; and if the particle size ratio is not in a preset particle size ratio range, adjusting a water adding rate of the first pump pulp tank until the particle size ratio is in the particle size ratio range, wherein the water adding rate is positively correlated with the particle size ratio. The classification accuracy of the cyclone group can be improved by the application.