11 results about "Boric acid powder" patented technology

The application discloses a preparation method of a microcrystalline glass binder for a semiconductor wafer thinning grinding wheel, which comprises the following steps: obtaining a plurality of raw materials of the microcrystalline glass binder, including ethyl orthosilicate, pseudo-boehmite, lithium hydroxide sol, boric acid, sodium nitrate, potassium nitrate, chromium hydroxide sol and butyl titanate; mixing the plurality of raw materials in a first solvent and sufficiently hydrolyzing to obtain a homogeneous precursor solution; then adding a PH adjusting substance, a non-polar solvent, lithium hydroxide sol and chromium hydroxide sol in sequence to obtain a homogeneous sol system; adding boric acid powder, sodium nitrate powder and potassium nitrate powder into the homogeneous sol system and performing heating and stirring to obtain a homogeneous mixed sol; performing aging and drying on the homogeneous mixed sol to obtain a mixed gel; and performing dry ball milling and wet ball milling on the mixed gel to obtain a microcrystalline glass binder powder. The microcrystalline glass binder prepared according to the application has a relatively low softening temperature and has relatively high strength and wettability.

The present application relates to aquaculture wastewater treatment technical field, specifically to a kind of surface boric acid layer modified zero-valent iron material and its preparation and application.The present application provides a kind of surface boric acid layer modified zero-valent iron material preparation method, comprising: boric acid powder is mixed with zero-valent iron powder to obtain mixture, water is added, ball milling is carried out under inert atmosphere, to obtain surface boric acid layer modified zero-valent iron.This method is based on mechanical chemistry principle, uses mechanical shearing force, impact force and friction force and other forces, boric acid, water and zero-valent iron are mechanically ball-milled, and a layer of uniform coated surface boric acid layer is generated on the surface of zero-valent iron material, to improve the removal efficiency of fluorophenylc.

This application provides a high-purity, low-density boron nitride crucible, its preparation method, and its application, relating to the field of crucible technology. The boron nitride crucible preparation method of this application includes the following steps: pulverizing and drying boron nitride raw materials to obtain boron nitride powder; mixing boron nitride powder, boric acid powder, and melamine powder evenly, baking at 300℃-400℃ for 4-8 hours, and then isostatically pressing into a blank; under flowing nitrogen protection, heating the blank to 350℃-400℃ at a heating rate of 3℃ / min-5℃ / min, and then further heating at a heating rate of 0.2℃ / min-0.5℃ / min to... The temperature is initially set at 550℃-600℃, then increased to 1150℃-1250℃ at a rate of 3℃ / min-5℃ / min, followed by a further increase to 1850℃-1900℃ at a rate of 5℃ / min-10℃ / min. The temperature is held for 1-3 hours and then cooled. After processing into plates and frames of different sizes, the temperature is further increased to 1950℃-2000℃ under flowing nitrogen protection, held for 20-50 hours, cooled, and assembled into boron nitride crucibles. The boron nitride crucibles obtained in this application have high purity and low density, and can be used to prepare silicon nitride substrates; the preparation cost is low.

The invention discloses a preparation method of a refractory material for an economical medium-frequency induction furnace lining, which comprises the following steps: mixing 6-15 parts by weight of magnesia particles with the particle size of 1-3mm and 8-20 parts by weight of fused alumina-magnesia spinel material with the particle size of 5-8mm, then adding 10-35 parts by weight of magnesia particles with the particle size of 0-1mm and 7-15 parts by weight of silicon carbide micro powder with the particle size of 200 meshes, and mixing to obtain a mixture; the preparation method comprises the following steps: adding a water glass aqueous solution, uniformly mixing, then adding an additive boric acid powder which accounts for 1.5-3.0% of the total weight of the water-mixed material, and stirring for 20-35 minutes to prepare the economical refractory material for the medium-frequency induction furnace lining, thereby obtaining the refractory material which has stronger slag resistance and erosion resistance and is suitable for melting metals such as high-carbon steel, cast iron, alloy steel and the like. The alkaline furnace lining has the advantages of being capable of resisting corrosion of impurities such as metal oxides and the like, high in mechanical performance and capable of prolonging the service life of the intermediate frequency furnace lining, and the furnace lining mixture is non-toxic, harmless, environmentally friendly and free of pollution.

The invention relates to a phosphazene boric acid powder material, a preparation method and an application of the phosphazene boric acid powder material in a polymer solid electrolyte, and belongs to the technical field of functional polymer materials and new energy storage batteries, the molecular structural formula of the phosphazene boric acid powder material is as follows: 4-hydroxyphenylboronic acid pinacol ester and phosphonitrilic chloride trimer are taken as raw materials, and hexa (4-boric acid-phenoxy) cyclotriphosphazene (BCTP) is prepared through reaction; and then the BCTP is introduced into a polymer (taking polyethylene oxide as an example) solid electrolyte system, so that the thermal stability and the electrochemical performance of the solid electrolyte system are remarkably improved. The cycle of a lithium symmetric battery assembled by the phosphazene boric acid polymer solid electrolyte prepared by the invention can be as long as 800 hours. The phosphazene boric acid polymer solid-state electrolyte, a lithium iron phosphate pole piece and a lithium piece are assembled into a solid-state battery for performance research, and the result shows that the solid-state battery assembled by the phosphazene boric acid polymer solid-state electrolyte shows excellent cycle performance and can be stably charged and discharged for more than 1000 times.

The invention provides a high-purity low-density boron nitride crucible as well as a preparation method and application thereof, and relates to the technical field of crucibles. The preparation method of the boron nitride crucible comprises the following steps: crushing a boron nitride raw material, and drying to obtain boron nitride powder; the preparation method comprises the following steps: uniformly mixing boron nitride powder, boric acid powder and melamine powder, baking at 300-400 DEG C for 4-8 hours, and carrying out isostatic pressing to form a green body; under the protection of flowing nitrogen, heating the green body to 350-400 DEG C at the heating rate of 3-5 DEG C / min, then heating to 550-600 DEG C at the heating rate of 0.2-0.5 DEG C / min, then heating to 1150-1250 DEG C at the heating rate of 3-5 DEG C / min, then heating to 1850-1900 DEG C at the heating rate of 5-10 DEG C / min, keeping the temperature for 1-3 hours, and then cooling; the preparation method comprises the following steps: processing the raw materials into plates and frames with different sizes and specifications, heating to 1950-2000 DEG C in a programmed manner under the protection of flowing nitrogen, preserving heat for 20-50 hours, cooling, and assembling into the boron nitride crucible. The boron nitride crucible prepared by the invention is high in purity and low in density, and can be used for preparing a silicon nitride substrate; the preparation cost is low.

The utility model discloses a nuclear power plant non-nuclear area boric acid powder full -automatic vacuum metering conveying system relates to conveying system technical field, include: crushing device for the crushing of material, metering device, and the discharge end of crushing device is connected to the feeding end, is used for the metering of material, reaction kettle, and the discharge end of metering device is connected to the feeding end, is used for receiving material and carries out the reaction, vacuum pump, with metering device and reaction kettle intercommunication, is used for providing vacuum environment. The conveying system of the utility model has simple operation step, equipment operation is reliable, work efficiency is high and can continuous operation etc. advantage, has reduced the labor intensity of operator, improved work environment, saved manpower cost.

The invention relates to the technical field of building materials, and discloses a novel anti-dispersion grouting material capable of adjusting setting time under a flowing water condition. The invention relates to a quick hardening iron aluminate cement mortar which is prepared from the following raw materials: quick hardening iron aluminate cement, silica fume, superfine fly ash, a modified inorganic thixotropic stabilizer, a composite setting time regulator, polycarboxylate superplasticizer powder, hydroxyethyl methyl cellulose, an organic silicon defoaming agent and the like. The dispersion resistance of the slurry in a flowing water environment is improved; the hydration rate is regulated by utilizing the synergistic effect of the boric acid powder and the trisodium citrate dehydrate powder, so that the technical problem that the setting time of the quick-hardening cement is difficult to control is solved; and in cooperation with the micro-grading filling effect of the mineral admixture, the high fluidity, high flowing water retention rate and high early strength of the slurry under the low water-binder ratio are achieved, and the slurry is suitable for grouting reinforcement in the complex underground flowing water environment.

The application relates to the technical field of fastener manufacturing and processing, and discloses a chipless rotary swaging forming process for a screw tail drill tip, which comprises the following steps: preparing a water-based lubricating composition containing boric acid powder, D-tartaric acid, polyethylene glycol and water-soluble friction chemical extreme pressure agent; after being cleaned, a metal wire is sprayed with the water-based lubricating composition on the surface; the metal wire is subjected to surface layer heating through a high-frequency induction heating coil, and the surface is blown by an annular air knife to form a high-viscosity semi-solid pre-coating film through dehydration; the metal wire with the pre-coating film is fed into a rotary swaging die to form a screw tail drill tip structure through rotary swaging; and the formed structure is cooled, cleaned and dried. The semi-solid pre-coating film with physical strength is formed on the metal surface through heating and blowing, continuous lubrication is provided in the rotary swaging process, lubricant loss is avoided, the drill tip is formed without chips, and die wear is reduced.

The invention belongs to the field of analysis and detection, and relates to a method for rapidly determining chromium content in high-carbon ferrochrome, which comprises the following steps: 1) crushing high-carbon ferrochrome and sieving to obtain high-carbon ferrochrome powder; (2) boric acid powder is used for bottoming, the high-carbon ferrochrome powder obtained in the step (1) is laid on the boric acid powder, pressing is conducted through a tablet press, and a pressed sheet sample is obtained; (3) analyzing the sheet sample obtained in the step (2) by adopting a qualitative and semi-quantitative method in a fluorescence spectrophotometer to obtain the sum of the mass percentage contents of the elements and the uncorrected mass percentage content of the chromium element; and 4) calculating the chromium content: CCr = CCr0 * 100% / (CC + SUQ). The method has the advantages that the sheet formed by pressing the high-carbon ferro-chrome sample is measured by adopting the fluorescence spectrophotometer, and the measurement result is corrected, so that the characterization method of the chromium content is finally obtained.

The invention discloses a movable boron adding device for boron preparation of a nuclear power plant, relates to the technical field of operation supply systems, and aims to solve the problems that the boron preparation time is relatively long in the boron preparation operation process of the existing nuclear power plant, boric acid is poured by personnel in high-altitude load-bearing operation, boric acid solid dust splashes, and boric acid powder agglomerates to influence the boron preparation efficiency. The device comprises a boron preparing and dosing device part and a boric acid tank cart, the boron preparing and dosing device part comprises a boron adding bin of a trapezoidal bevel structure, the boron adding bin is further connected with a boron adding bin supporting rod, the bottom of the boron adding bin is connected with a boric acid conveying component through a discharging device, and a variable frequency motor is further arranged between the discharging component and the boric acid conveying component; the boric acid tank is fixed on the roll-over stand of the boric acid tank cart through the clamping and fixing clamp, the roll-over stand is connected with the lifting table through a rotating shaft at the front part of the lifting table, and the lifting table is mounted on the movable frame and can lift on the boric acid tank cart.