667 results about "Spray Granulation" patented technology

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

A preparation and use method for an Nb5Si3 composite spheroidized powder. The preparation method comprises: A) mixing an Nb powder, an Si powder, PVA and water, and ball milling the resulting mixture to obtain a slurry; and subjecting the slurry to spray granulation and sieving, so as to obtain an Nb5Si3 composite agglomerated powder; and B) subjecting the Nb5Si3 composite agglomerated powder to plasma spheroidization to obtain the product. The use method comprises mixing the Nb5Si3 composite spheroidized powder with NbTiX, wherein X is three or more of Zr, Hf, V, Mo and Ta; Nb and Si in the raw materials are subjected to an in-situ reaction during a laser additive melting process; and in combination with a rapid solidification process, a submicron Nb5Si3 particle-reinforced Nb5Si3 / Nbss dual-phase alloy can be obtained. Compared with a cast alloy having the same components, the Nb5Si3 particle-reinforced phase can be greatly reduced from a size level of dozens of microns to a submicron level, which greatly reduces the brittleness of the particle-reinforced refractory alloy, and significantly improves the strength of the particle-reinforced refractory alloy.

The invention discloses a double-component reinforced 5Y-PSZ dental ceramic material and a preparation method thereof, and relates to the technical field of ceramic material preparation. The method comprises the following steps: mixing ZrCl4 and deionized water, and dropwise adding an ammonia water solution to prepare m-ZrO2 nano ceramic powder; zrOCl2. 8H2O, Y (NO3) 3.6 H2O and deionized water are mixed, the m-ZrO2 nano ceramic powder and polyethylene glycol 2000 are added, and the material is prepared through calcination, spray granulation, hot-pressing presintering and high-temperature sintering. According to the 5Y-PSZ dental ceramic material disclosed by the invention, the nano-scale m-phase ZrO2 is adopted as a reinforcing material and is dispersed and distributed inside the 5Y-PSZ, and through volume expansion generated by t-m phase change of the m-phase ZrO2, the anti-aging performance is guaranteed, and meanwhile, the reinforcement of the 5Y-PSZ dental ceramic material is realized. The invention solves the problem of insufficient strength of the 5Y-PSZ dental ceramic material in the prior art.

The invention relates to the technical field of molten salt, in particular to nitro binary molten salt and a preparation method thereof. The preparation method comprises the following steps: mixing sodium carbonate and a potassium hydroxide solution, and then adding a starch-based grafted crystal inhibitor to inhibit crystallization; adding a nitric acid aqueous solution in two stages, and introducing eutectic seed crystals to guide nucleation at the end of the first stage; crystal distribution is optimized through falling film evaporation and concentration and setting of partial reflux; and after spraying granulation, carrying out short-time melting reforming and controlled cooling in an inert atmosphere. According to the method, the composition uniformity and the structural stability of the molten salt are remarkably improved, so that the product has a melting point close to a theoretical eutectic point, low supercooling degree, high melting latent heat and excellent thermal cycling stability and corrosion resistance, and is suitable for an industrial heat storage system running for a long time.

According to the high-thermal-conductivity flame-retardant copper-clad laminate and the preparation method thereof, the thermal conductivity and the limit oxygen index of a copper-clad plate can be effectively improved, so that the high-thermal-conductivity flame-retardant property of the copper-clad plate is effectively improved; modified aluminum nitride and phosphoric acid modified aluminum nitride powder in the heat-conducting filler can keep good hydrolysis resistance in the ball milling process; polyvinyl butyral and polyethylene glycol are compounded as a binder, so that the modified aluminum nitride has good sphericity and surface smoothness, and the spherical aluminum nitride prepared by water-based spray granulation is suitable for being used as a heat-conducting filler of a thermal interface material; modified silicon dioxide in the heat-conducting filler adopts cerium-doped hollow mesoporous silicon dioxide nanospheres coated with polydopamine, and a corrosion inhibitor MBT (2-mercaptobenzothiazole) is loaded by the cerium-doped hollow mesoporous silicon dioxide nanospheres; controllable release of the corrosion inhibitor MBT and rare earth cerium ions is achieved, the process of corroding the cathode and the anode can be inhibited at the same time, and the corrosion resistance and the corrosion self-repairing performance of the copper-clad plate can be effectively improved.

The invention belongs to the technical field of ceramic material preparation, and particularly relates to a process for preparing a high-compactness silicon carbide ceramic material based on a reaction sintering method, and the process comprises the steps of raw material preparation, material mixing, spray granulation, cold press molding, drying and glue discharging, mold filling, reaction sintering, demolding and grinding. The nano silicon carbide ceramic comprises the following raw materials in parts by weight: 88-92 parts of nano silicon carbide, 8-12 parts of a sintering aid, 2-4 parts of organic polyvinylpyrrolidone, 0.3-0.5 part of polycarboxylic acid and 0.2-0.3 part of a release agent. The sintering aid is a mixture of carbon black and graphite powder in a mass ratio of 3: 2. By optimizing the raw material ratio and the reaction sintering process and organically combining the raw material ratio and the reaction sintering process, the obtained silicon carbide ceramic material is good in compactness, high in toughness and bending resistance and excellent in overall performance, the reaction sintering process is low in energy consumption, the preparation cost is effectively reduced, and remarkable economic benefits and social benefits are achieved.

The invention discloses carbon-coated lithium iron manganese phosphate, a preparation method thereof, a positive pole piece containing the carbon-coated lithium iron manganese phosphate, a battery containing the carbon-coated lithium iron manganese phosphate, and an electric device containing the carbon-coated lithium iron manganese phosphate. Lithium iron manganese phosphate slurry with the volume distribution particle size Dv50 of 100-150 nm and lithium iron manganese phosphate slurry with the volume distribution particle size Dv50 of 400-800 nm are mixed, and then spray granulation treatment, sintering treatment and crushing treatment are performed to obtain the carbon-coated lithium iron manganese phosphate. And the carbon-coated lithium manganese iron phosphate is obtained. The carbon-coated lithium manganese iron phosphate prepared by the preparation method provided by the invention can have high gram volume, high powder compaction density, low specific surface area and high cycle stability, and when the carbon-coated lithium manganese iron phosphate is applied to a positive pole piece and a battery, the battery can have high energy density and good cycle performance.

The invention relates to the technical field of thermal protection coatings, and discloses a high-reflection thermal protection coating and a preparation method thereof.LSTN0.125 powder is subjected to spray granulation and then pre-sintered and sieved, and spherical LSTN0.125 ceramic powder is obtained; the alloy substrate is subjected to roughening treatment, and a bonding layer is prepared on the surface of the alloy substrate through the atmosphere plasma spraying technology; the spherical LSTN0.125 ceramic powder obtained in the step S1 is sprayed on the bonding layer through the atmosphere plasma spraying technology, and an LSTN0.125 ceramic layer is obtained; and the LSTN0.125 ceramic layer is subjected to heat treatment, and the LSTN0.125 thermal protection coating is obtained. According to the invention, the LSTN0.125 with high reflectivity is used as a powder raw material of the coating, so that the high reflection performance of the coating in a near-infrared band can be remarkably enhanced, and the effect of isolating high temperature is achieved.

The invention relates to the field of battery materials, in particular to a preparation method and application of a high-tap-density spheroidized silicon-carbon negative electrode material. The preparation method of the high-tap-density spheroidized silicon-carbon negative electrode material comprises the following steps: S1, graphite is subjected to shaping treatment; s2, preparing silicon-carbon mixed slurry; s3, carrying out spray granulation on the silicon-carbon mixed slurry; and S4, mixing, coating and carbonizing the silicon-carbon mixed particles and a coating agent. The invention provides the preparation method of the high-tap-density spheroidized silicon-carbon negative electrode material, and the finally prepared silicon-carbon negative electrode material improves the volume expansion of a silicon-based negative electrode and improves the tap density; according to the present invention, the sand milling mixing technology improves the non-uniform mixing of the materials in the precursor slurry of the spray granulation technology, the secondary coating of the particles can be achieved after the carbonization of the binder and the coating agent, and the coated silicon-carbon negative electrode battery has advantages of stable capacity, good cycle performance and wide application potential.

The invention discloses a preparation method of stable spray granulation silicon nitride slurry and granulation powder, and belongs to the technical field of ceramic materials. According to the invention, absolute ethyl alcohol is adopted as a solvent, so that the problem that silicon nitride slurry is easy to hydrolyze is solved, and the temperature during spray granulation is reduced. On the basis that a dispersing agent is added into slurry, tetramethylammonium hydroxide is added into the slurry, the Zeta potential value of the slurry is increased, the slurry is made to be in an alkaline environment, dissociation of Si-OH groups is promoted, more negative charges are carried on the surface of silicon nitride, meanwhile, zwitterions released by the tetramethylammonium hydroxide form a double-electron layer around silicon nitride particles, and therefore the conductivity of the silicon nitride particles is improved. The dispersity of the particles in the slurry is improved. The silicon nitride powder is more uniformly distributed in a medium such as a binder due to the improvement of the dispersibility, and the silicon nitride slurry with low viscosity, good dispersibility, good stability and good fluidity can be prepared. The slurry can be more symmetrically gathered and formed in the spray granulation process, and the sphericity degree and apparent density of granulation powder are improved.

The invention relates to an agglomerated ceramic abrasive which is prepared from the following raw materials in percentage by weight: 25-30% of a ceramic bond, 65-70% of diamond micro-powder, 1-3% of titanium powder, 2.5-5% of nitrate, 0.3-0.5% of nickel sulfate and 1-3% of aluminum zirconate, and is prepared by the following steps: adding water into the raw materials, uniformly mixing, and grinding; and then carrying out spray granulation, impurity drying and sintering to obtain the agglomerated ceramic abrasive material. Compared with a common ceramic bond diamond agglomerated abrasive material, the agglomerated ceramic abrasive material prepared by the method has the advantages of high hardness, uniform particle distribution, good grinding performance and the like. When the agglomerated ceramic abrasive is used for polishing marble tiles, no obvious scratches appear on the surfaces of the tiles, the surface consistency is good, and the polishing efficiency of the marble tiles is high.

The invention provides a high-frequency low-loss manganese zinc ferrite magnetic core and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing base material Fe2O3 powder, MnO powder and ZnO powder, and sequentially carrying out first ball milling treatment, first sintering treatment and spray granulation to obtain granulated powder; and (2) mixing the granulated powder and an additive, and sequentially carrying out second ball milling, compression molding and second sintering treatment to obtain the high-frequency low-loss manganese zinc ferrite magnetic core. The manganese-zinc ferrite magnetic core prepared by the method is relatively low in magnetic loss under the condition of 3-5MHz, and has a wide-range popularization and application prospect.

The invention provides partial yttrium-stabilized zirconia powder with a polymorphic pore structure and a preparation method of the partial yttrium-stabilized zirconia powder with the polymorphic pore structure, slurry is prepared by adding a pore-forming agent and adjusting the mass ratio of nano yttrium-stabilized zirconia powder to pore-forming agent powder to a dispersing agent solution to deionized water, then spray granulation is performed, and corresponding parameters are adjusted, so that the partial yttrium-stabilized zirconia powder with the polymorphic pore structure is obtained. And finally, preparing the partially yttria-stabilized zirconia powder with a polymorphic pore structure through a vacuum drying and degreasing calcination process. The coating with the composite pores is prepared by optimizing atmospheric plasma spraying parameters, such as setting plasma working voltage and current, powder feeding parameters and powder feeding speed, and adjusting the powder feeding air quantity and the like. According to the powder, a pore-forming agent and a dispersing agent are reasonably prepared in precursor slurry, and the powder has the advantages of forming a multi-stage pore structure, an internal supporting framework, good sphericity and sprayability and the like through the working procedures of spray granulation, vacuum drying, degreasing, calcination and the like. The powder can be used for preparing a coating with a porous composite structure, and the stability of the coating is remarkably improved.

The invention belongs to the technical field of fertilizers, and particularly discloses coated 5-aminolevulinic acid as well as a preparation method and application thereof. The preparation method of the coated 5-aminolevulinic acid comprises the following steps: (1) melting: melting urea phosphate to obtain a coating agent; and (2) mixing: uniformly mixing the coating agent and 5-aminolevulinic acid powder in a high-tower granulator, carrying out spray granulation, and cooling and curing to obtain the coated 5-aminolevulinic acid. The preparation method disclosed by the invention is simple in process, and the prepared coated 5-aminolevulinic acid is good in stability and can promote the growth of chilies.

The invention relates to the technical field of ladle bricks, and particularly discloses a low-aluminum refined ladle brick and a preparation method thereof.The low-aluminum refined ladle brick is prepared by mixing, by mass, 10-15 parts of fused magnesite with the particle size smaller than or equal to 0.088 mm, 30-40 parts of fused magnesite with the particle size ranging from 1 mm to 3 mm, 20-25 parts of fused magnesite with the particle size ranging from 3 mm to 5 mm, 5-8 parts of a composite binder, 2-3 parts of white clay and 0.5-1 part of carbon black; the preparation method comprises the following steps: taking fused magnesite, white clay, carbon black and a composite binder, mixing, homogenizing, carrying out mold pressing and heat treatment, and standing overnight at 45-55 DEG C, thereby obtaining the product, wherein the composite binder is obtained by mixing aluminum carbon silicide mixed powder and asphalt powder, then performing spray granulation to obtain mixed microspheres, humidifying the mixed microspheres, then mixing the mixed microspheres with pretreated silicon carbide fibers, rolling the mixed microspheres, and finally performing remelting and cooling treatment. By using the composite binder prepared by the invention, the oxidation resistance of the brick body can be improved, and the generation of microcracks can be inhibited.

A lithium iron phosphate / carbon / lithium-rich lithium iron oxide composite cathode material and a preparation method and an application thereof are provided. The preparation method includes the following steps: mixing iron salt, lithium compound, orthophosphate and an organic salt with water, to obtain a mixed slurry; performing a spray granulation on the mixed slurry, to obtain a precursor powder; and performing a heat preservation on the precursor powder in a protective atmosphere, to obtain a lithium iron phosphate / carbon / lithium-rich lithium iron oxide composite cathode material. The preparation method is based on the characteristics that electric double layer physical energy storage of porous carbon can enhance the rate, and lithium-rich lithium iron oxide additive can increase the system lithium source and prolong the service life, combined with the synthesis process of lithium iron phosphate and lithium-rich lithium iron oxide, a lithium iron phosphate / carbon / lithium-rich lithium iron oxide composite cathode material is synthesized by one-step method.

The invention relates to the technical field of ceramic product production and manufacturing equipment and a preparation process, in particular to a spray granulation process which comprises the following steps: preparing zirconium oxide slurry with the solid content of 90%, conveying the zirconium oxide slurry to a nozzle through a pipeline, and enabling the slurry to meet airflow at the nozzle and be atomized into tiny liquid drops; atomized liquid drops make contact with hot airflow for drying, the airflow temperature is controlled by a temperature control system to gradually rise from the inlet section to the outlet section of the main tower, and an airflow system adjusts the airflow speed and the airflow direction; the particles with the particle size larger than or equal to 40 micrometers fall to a discharging port in the bottom of the main tower under the action of strong airflow, and the particle size is lt; particles with the particle size of 40 microns flow to a brown air opening under the action of relatively weak air flow; the dried large particles are guided out from a discharge hole in the bottom of the main tower through a strong airflow regulator to be collected, and the dried small particles are collected through a connecting pipeline and a cyclone separator through an air inlet; the large particles are directly stored or subsequently processed, and the small particles are further processed or sub-packaged. Precise classified collection is achieved, and the granulation quality and the production efficiency are improved.

The invention discloses a preparation method and application of zirconia ceramics, and relates to the technical field of zirconia ceramics, and the preparation method comprises the following steps: mixing 100-200nm nano zirconia, 200nm-400nm alumina, a binder, an emulsifier and a dispersant, adopting a high-purity alumina grinding ball as a grinding medium, stirring and grinding for 4-8 hours at a rotating speed of 700-1000r / min, and then grinding for 1-2 hours at a sanding rotating speed of 1500-2000r / min, so as to obtain the zirconia ceramics. Mixed slurry is obtained; carrying out spray granulation on the mixed slurry; the components of the zirconia ceramic are mixed and granulated, Fe3Al is deposited on the surface of the composite ATZ powder in a magnetron sputtering mode, the uniform dispersion effect and binding force of the composite powder are guaranteed, and meanwhile, due to the fact that the composite powder has a similar thermal expansion coefficient with zirconia, the composite powder has good thermal expansion performance under the condition that the fracture toughness, strength and hardness of the composite powder are not sacrificed. The low-temperature thermal shock resistance of the zirconia ceramic is improved, the stability of the zirconia ceramic bearing is ensured, and the thermal shock resistance and strength of the ceramic are remarkably improved compared with a traditional mixed powder preparation process.

Compositions for the immediate release of one or more cannabinoids, in which the compositions comprise a population of particles. Each particle may comprise the one or more cannabinoids and one or more intra-granule excipients. Alternatively, each particle may comprise the one or more cannabinoids and a porous bead core. The composition may be prepared by a method that involves combining the one or more cannabinoids with the one or more intra-granule excipients, and then granulating the combination, such as through fluid bed granulation, shear-induced wet granulation, or spray granulation. The composition may also be prepared by a method that involves mixing the one or more cannabinoids with a population of porous bead cores.

The invention discloses metal ceramic MAX-phase composite powder for spraying and a preparation method of the metal ceramic MAX-phase composite powder, and belongs to the field of metal ceramic composite materials. The method comprises the following steps: mixing Ni powder, Cr powder and Cr2AlC nano powder with deionized water, a binder and a dispersant according to a specific ratio, and carrying out wet ball milling to prepare uniform slurry; carrying out spray granulation to obtain primary spherical powder; and finally, carrying out spheroidizing treatment on the primary powder by adopting radio frequency plasma under the protection of inert gas to obtain a final product. The core of the preparation method is that through an optimized two-step process, many limitations in the application aspect of an existing MAX phase material are solved, and the composite powder which is high in sphericity degree, good in flowability, compact in interior and stable in MAX phase component is successfully prepared. The powder can be directly used for thermal spraying, and an ideal raw material is provided for preparing a high-performance MAX-phase metal ceramic coating.

The invention discloses a gallium-cerium co-doped ITO target material and a preparation method thereof, and belongs to the field of transparent conductive oxide ceramic target materials, and the preparation method comprises the following steps: weighing indium oxide powder raw materials, tin oxide powder raw materials, gallium oxide powder raw materials and cerium oxide powder raw materials in proportion, and performing pretreatment; the raw material powder is subjected to independent ball milling till the raw materials reach the preset particle size; mixing the four kinds of slurry, and continuously performing ball milling to obtain uniform mixed slurry; adding a binder into the mixed slurry, and carrying out ball milling and mixing to form stable formed slurry; carrying out spray granulation on the formed slurry to obtain spherical precursor powder; pressing and forming the precursor powder to obtain a biscuit, then putting the biscuit into a sintering furnace, carrying out stepped sintering in an oxygen atmosphere, and naturally cooling to obtain the gallium-cerium co-doped ITO target material. According to the gallium-cerium co-doped ITO target material prepared by the method, the relative density is greater than or equal to 99.4%, the resistivity is less than or equal to 99.4%, and the three-point bending strength is greater than or equal to 230MPa.

The invention discloses a preparation method of a silicon-titanium composite particle with a raspberry-shaped structure, which comprises the following steps: compounding nano-scale silicon dioxide and titanium dioxide according to a certain ratio, and carrying out spray granulation to obtain the silicon-titanium composite particle. After light rays are incident, the light rays are subjected to multiple scattering due to aggregation and stacking of the microparticles, and the particles with the raspberry-shaped structures have a soft focus effect due to reflection and transmission of the surfaces and the internal particles of the particles. The high-refractive-index titanium dioxide uniformly distributed in the particles can improve the light diffusion effect and improve the sunscreen performance of the particles at the same time. The method has the characteristics of simplicity and convenience in operation, easiness in obtaining raw materials, high biocompatibility and the like, and has a wide application prospect in the field of cosmetics.

The invention relates to the technical field of ceramic products, in particular to a high-temperature-resistant and high-strength domestic ceramic product and a preparation method thereof.The preparation method comprises the following steps that modified alumina fibers, silicon carbide, a dispersing agent, a binding agent and deionized water are subjected to ball milling and mixing, and ceramic slurry is obtained; the modified alumina fiber is obtained by heating alumina-zirconia-lithium scandium silica gel fiber from room temperature to 600 DEG C at a heating speed of 2 DEG C / min, and keeping the temperature for 2 hours; the temperature is increased to 1000 DEG C at the temperature increasing speed of 8 DEG C / min, and heat preservation is conducted for 2 h; and carrying out spray granulation, dry pressing and sintering on the ceramic slurry to obtain the high-temperature-resistant and high-strength domestic ceramic. The alumina fiber is modified; the fracture toughness and the fracture strain of the silicon carbide ceramic can be remarkably improved, and the fracture toughness, the impact strength and the high-temperature strength retention rate of the silicon carbide ceramic can also be improved; and CTE gradient transition is realized, and the problems of high-temperature grain coarsening and brittle phase are solved.

The invention provides magnesium oxide coated aluminum nitride high-thermal-conductivity spherical powder and a preparation method thereof, and belongs to the field of coated aluminum nitride high-thermal-conductivity spherical powder. The preparation method comprises the following steps: preparing modified aluminum nitride powder, preparing magnesium salt nano micro-precipitation sol, performing spray granulation and calcining. The step of preparing the modified aluminum nitride powder comprises the following steps: carrying out ball milling treatment on aluminum nitride, absolute ethyl alcohol, yttrium oxide, lanthanum oxide and a modified aluminum nitride powder additive, and washing and drying to obtain the modified aluminum nitride powder; the modified aluminum nitride powder admixture is a mixture of phosphoric acid, aluminum dihydrogen phosphate, gamma-aminopropyltriethoxysilane and polyoxyethylene stearate; according to the magnesium oxide coated aluminum nitride high-thermal-conductivity spherical powder prepared by the preparation method disclosed by the invention, on the premise of ensuring the thermal conductivity, the hydrolysis resistance is improved, the surface density is enhanced, and the stability is improved.

The invention relates to a silicon nitride crystal based on high static nitrogen pressure and active nitrogen regulation and a growth method thereof. The silicon nitride crystal is prepared by the growth method, and the method adopts a physical gas phase transmission process and specifically comprises the following steps: introducing high static pressure nitrogen (1-3 bar) and trace NH3 / N2 mixed gas into source powder formed by mixing high-purity beta-Si3N4 and polycrystalline silicon, and dynamically maintaining the gas phase N / Si molar ratio to be (1.33 + / -0.1): 1, thereby inhibiting the decomposition of the source powder and stabilizing the crystal growth; carrying out spray granulation on the source powder, carrying out compression molding, placing the obtained product in a graphite crucible with the inner wall coated with TaC, and carrying out ordered epitaxial growth by controlling the temperature difference of a temperature zone at 1800-2000 DEG C and the axial temperature gradient; according to the method, the dislocation density and the carbon impurity content of the silicon nitride crystal can be remarkably reduced, then the high-purity silicon nitride crystal with a complete structure and a smooth surface is obtained, and the method is suitable for the fields of high-temperature electronic devices and deep ultraviolet light electronics.

The invention belongs to the technical field of electronic ceramic substrate materials, and particularly relates to a preparation method of a microcrystalline glass composite silicon nitride ceramic substrate, which is prepared from the following raw materials: 1-5% of alpha-phase silicon nitride powder, 86-95% of beta-phase silicon nitride powder, 0.2-3% of metal silicon powder, 2.5-8% of glass powder and 1.3-8% of metal oxide. The preparation method comprises the following steps: S1, mixing and grinding raw materials to obtain ceramic slurry; s2, adding Arabic gum into the ceramic slurry as a binder, and carrying out spray granulation; granulation powder is obtained; s3, carrying out dry pressing molding and cold isostatic pressing treatment on the granulation powder to prepare a ceramic plate blank; and S4, sintering and crystallizing the ceramic plate blank. According to the invention, the glass ceramic powder is introduced as a sintering aid and a second phase, and the sintering temperature of the silicon nitride is obviously reduced from the conventional temperature of more than 1800 DEG C to 1500 DEG C by utilizing the liquid phase effect of the glass ceramic powder in the sintering process, so that two modes of air pressure sintering and normal pressure sintering can be used, and the energy consumption and the requirements on equipment are reduced.

The invention discloses a nano-material piezoresistor and a preparation method thereof, and belongs to the technical field of piezoresistors, the preparation method of the nano-material piezoresistor comprises the following steps: S1, preparing raw materials for preparing the piezoresistor by mole percent: 94 to 96 percent of ZnO, 1.0 to 1.5 percent of Bi2O3, 0.5 to 1.5 percent of Co3O4, 0.3 to 0.8 percent of Mn2O3, 1.0 to 3.0 percent of Sb2O3 and 0.3 to 0.8 percent of NiO; s2, additives except ZnO are mixed, deionized water and a dispersing agent are added to prepare additive slurry, the additive slurry is dried and smashed after being sanded, and additive powder is obtained; s3, mixing ZnO with the additive powder, adding deionized water, a dispersing agent and a binder, and performing ball milling and refining in a ball mill to obtain total slurry; and S4, carrying out spray granulation, water-containing aging and dry-pressing molding on the total slurry, carrying out glue removal treatment on a green body subjected to dry-pressing molding, then carrying out high-temperature sintering, grinding and flattening, then carrying out heat treatment, coating silver electrodes on the upper and lower end surfaces, and coating insulating glaze on the side surfaces to obtain the piezoresistor. Wherein the dispersing agent improves the dispersity of the nano-powder, and the nano-powder has application prospects.

The invention relates to a method for preparing a hard carbon material from a low-rank coal hot melt, the hard carbon material obtained by using the method, application of the hard carbon material and a sodium ion battery containing the hard carbon material. The method comprises the steps of raw material pretreatment, degradation solvent extraction, precipitation separation, spray granulation, crosslinking, primary carbonization, secondary carbonization, cooling and the like. According to the method, microcrystalline defects of the coal-based hard carbon material are regulated and controlled through self-foaming of the low-rank coal hot melt, effective regulation and control of the hard carbon microcrystalline structure are achieved, the ultrafine grinding process is omitted, meanwhile, in-situ oxygen element doping is achieved, and the surface activity of the material and the first efficiency of the negative electrode material are effectively improved. Through the method, the low-rank coal can be converted into the sodium battery hard carbon negative electrode material in a high-valued manner, the application scene of the low-rank coal is expanded, and the comprehensive utilization level of coal resources is improved.

The present invention belongs to the technical field of abrasives. Provided are a modified diamond abrasive, and a preparation method therefor and the use thereof. The preparation method for the modified diamond abrasive comprises: modifying a diamond abrasive by means of a silane coupling agent, so as to obtain a first abrasive; uniformly mixing the first abrasive, a polyamide acid solution and an ionic liquid, and then subjecting the mixture to spray granulation, so as to obtain a second abrasive; and subjecting the second abrasive to an imidization treatment, so as to obtain the modified diamond abrasive, wherein the viscosity of the polyamide acid solution is 200-900 cp. The obtained modified diamond abrasive has a high sphericity degree and a high mechanical strength, thereby effectively solving the problems of passivation and a grinding efficiency reduced along with same of a grinding blade of a traditional diamond abrasive.

The invention relates to the technical field of pesticide bactericides, and particularly discloses a bactericide containing atomic copper and zinc oxide. Transition metal copper is anchored in defect sites on the surface of nano-zinc oxide in a monatomic form to obtain composite powder, the composite powder and an auxiliary agent are mixed and stirred and then subjected to coarse crushing, fine grinding, spraying and granulation, and the bactericide containing atomic copper and zinc oxide is obtained. The bactericide provided by the invention solves the waste caused by clusters and crystal lattices of copper ions, achieves the effect of supplementing copper and zinc at the same time through disposable use, greatly reduces the cost, saves copper resources, enables the utilization rate of copper to be high, reduces the pollution of heavy metals to the environment, and efficiently prevents and removes insect pests, bacterial diseases and fungal diseases of crops; the bactericidal composition can be applied to most crops, is high in bactericidal speed and lasting in prevention and treatment effect, and can be compounded with various agricultural agents for use.