75 results about "Beryllium oxide" patented technology

The present invention relates to the technical field of inorganic materials, and particularly to a method for clean smelting of beryllium oxide and beryllium oxide. The smelting method includes using iron powder to remove trivalent iron in the acid leaching solution of beryllium ore; using a non-saponified extraction system without sodium ions and ammonium cations, and the non-saponified extraction system exchanges hydrogen ions with itself when extracting beryllium ions. The present invention solves the problems existing in beryllium smelting preparation in the prior art, such as low beryllium recovery rate, easy interference by associated elements, large pollution, and difficult waste liquid treatment. An alkaline earth metal compound is used as a raffinate impurity removal reagent and a non-saponified extraction system, and the raffinate after impurity removal is recycled for beryllium ore leaching, improving the beryllium recovery rate and reducing the environmental pollution caused by waste liquid discharge.

The invention relates to a porous beryllium oxide ceramic and a preparation method thereof, belongs to the technical field of porous ceramics, and aims to solve at least one of the problems that the porous beryllium oxide ceramic prepared by the existing method is low in porosity, low in strength, high in sintering process difficulty, easy to cause powder aggregation, poor in forming and the like. According to the invention, the nano beryllium oxide, the nano magnesium oxide, the nano aluminum silicate, the polyvinyl butyral, the sesbania powder and the absolute ethyl alcohol are combined according to a specific proportion, and the substances have a synergistic effect, so that the porosity, the strength and other properties of the porous beryllium oxide ceramic are improved. According to the invention, through elaborately designed component combination and a synergistic effect mechanism, comprehensive improvement of the performance of the porous beryllium oxide ceramic is realized, and a wider prospect is opened up for research, development and application of a ceramic material.

The invention belongs to the technical field of electrode paste, and relates to stainless steel silver platinum electrode paste and a preparation method and application thereof. The stainless steel silver platinum electrode slurry provided by the invention comprises composite conductive powder, modified composite conductive powder, glass powder, an inorganic carrier and a solvent, wherein the composite conductive powder is composed of stainless steel powder, silver powder and platinum powder; the preparation method of the modified composite conductive powder comprises the following steps: adding a mixture of stainless steel powder, silver powder and platinum powder into a mixture of carboxymethyl cellulose, N-(beta-aminoethyl)-gamma-aminopropyltrimethoxysilane and polyvinyl alcohol, ultrasonically dispersing uniformly, reacting for 4-6 hours at the temperature of 100-110 DEG C, cleaning and drying, thereby obtaining the modified composite conductive powder. The glass powder is prepared from SiO2, H3BO3, Al2O3, CuO and IrO2; the inorganic carrier is zirconium oxide or beryllium oxide; the solvent is absolute ethyl alcohol or diisooctyl ether. The conductivity and the stability of the electrode paste are remarkably improved.

The invention discloses a preparation method for a large beryllium oxide structural member, and belongs to the technical field of production processes of electronic functional ceramic materials. According to the preparation method for the large beryllium oxide structural part, the large beryllium oxide structural part can be produced, the internal stress of a green body can be effectively reduced in the production process, and then the ceramic sintering cracking risk is reduced. The preparation method comprises the following steps: dispersing and slurrying beryllium oxide powder, granulating and screening beryllium oxide slurry, and preparing a large-scale beryllium oxide structural part blank from qualified beryllium oxide granules in a cold isostatic pressing manner; and the large beryllium oxide structural part blank is subjected to segmented sintering forming in a kiln at least in three heating temperature sections with the heating rates gradually reduced. Wherein the beryllium oxide powder is dispersed by adopting a UP circulating stirring mill, and 0.3% of a magnesium and silicon eutectic mixture is added before stirring. In the forming process, only particles screened by 60-40 meshes and 40-20 meshes are selected to be mixed with slurry according to the proportion of 1: (3-5) to serve as a forming raw material.

The utility model discloses a film-coated cover plate capable of adjusting optical performance and a smart phone display screen, the film-coated cover plate capable of adjusting optical performance comprises a glass cover plate, and an aluminum oxynitride layer, a beryllium oxide layer and a bismuth trioxide layer which are arranged on the upper surface of the glass cover plate in sequence from bottom to top, the thickness of the aluminum oxynitride layer is 20nm-30nm, and the thickness of the beryllium oxide layer is 20nm-30nm. The thickness of the beryllium oxide layer ranges from 30 nm to 40 nm, and the thickness of the bismuth trioxide layer ranges from 10 nm to 20 nm. And the aluminum oxynitride layer is used as an adhesion layer, so that the adhesion between the subsequent plating layer and the glass cover plate can be enhanced. The bismuth trioxide layer serves as the outermost layer, possibly has specific optical and electrical properties and can be used for adjusting the optical performance of the coating layer, such as increasing the light transmittance and the refractive index, so that the optical performance of the coating layer is adjustable, and the competitiveness of the product is improved.

The invention belongs to the technical field of nuclear reactor cores, and particularly relates to a fast thermal coupling metal hydride reactor core controlled by a rotating drum and a rotating drum control method, and the reactor core comprises the rotating drum, a reactor core active area, a coolant flow channel, a beryllium oxide reflecting layer and a thermal insulation shielding layer; the coolant flow channel is composed of a coolant flow channel inner barrel and a coolant flow channel outer barrel; the reactor core active area is wrapped by the coolant flow channel inner barrel, and oxide fuel rods and metal hydride fuel rods are arranged in the reactor core active area; the beryllium oxide reflecting layer is arranged on the coolant flow channel outer barrel in a sleeving manner, and the heat preservation shielding layer is arranged on the beryllium oxide reflecting layer in a sleeving manner; a plurality of rotating drums are arranged between the beryllium oxide reflecting layer and the heat preservation shielding layer in the circumferential direction. The oxide fuel rods and the metal hydride fuel rods are arranged in the reactor core active area at the same time, so that the fast thermal coupling design of a reactor core neutron energy spectrum is realized, and the reactivity control value of the rotating drum is improved.

An electrically drivable motor for use in an aircraft, the motor comprises a motor coil 110 with coil windings; elongate thermally conductive members 120 arranged to thermally communicate with the coil windings; and a thermally conductive portion arranged to thermally communicate with the elongate thermally conductive members. A portion of the elongate thermally conductive members abuts a portion of the coil windings. Each of the elongate thermally conductive members has an in use thermal conductivity of at least 100 Wm-1K-1 and an electrical conductivity of less than 10-14 Sm-l. This could be for example a sapphire, diamond, aluminum nitride, alumina or beryllium oxide. The elongate thermally conductive members may be connected to the coil windings via laser ablation or a sol-gel process. The thermally conductive members may be in the form of plates or cables. The elongate thermally conductive members may be interleaved with the coil windings. The motor may be used in an aircraft propulsion system which uses cryogen for energy generation as well as for providing heat exchange to the thermally conductive portion or elongate thermally conductive members, aiding cooling of the windings.

The application relates to the field of ceramic materials, and particularly discloses high-thermal-conductivity alumina ceramics and a preparation process thereof. The high-thermal-conductivity alumina ceramics are prepared from 50-70 parts of alumina powder, 40-50 parts of alumina fiber, 8-15 parts of a sintering aid, 0.7-1.5 parts of a dispersant and 0.2-0.3 parts of a binder, wherein the sintering aid is beryllium-zirconium composite fiber. The high-thermal-conductivity alumina ceramics have excellent thermal conductivity and mechanical properties, and have important application prospects in the field of heat dissipation of high-performance electronic devices. In addition, the preparation process can reduce the sintering temperature of the alumina ceramics, form a more uniform and refined grain system in the alumina ceramics, and significantly improve the thermal conductivity of the alumina ceramics.

The invention belongs to the technical field of porous ceramic manufacturing, and particularly relates to a preparation method of a porous beryllium oxide ceramic chip. Granular polymer modified polyvinyl acetal with a specific particle size of 5-8 [mu] m is prepared through specific monomers and a monomer ratio, then beryllium oxide powder, a sintering aid and the polymer modified polyvinyl acetal are subjected to ball milling, then cold isostatic pressing molding is performed, the polymer modified polyvinyl acetal is subjected to ball milling and serves as an adhesive and a pore-forming agent at the same time, and the porous beryllium oxide is obtained. Sintering is carried out after molding, a large number of uniform pore structures are formed in the sintering process, excellent electrical properties are provided, and good mechanical properties are kept.

The invention belongs to the technical field of beryllium oxide processing, and particularly relates to an energy-saving beryllium oxide processing device which comprises a supporting frame, a discharging hopper is installed in the middle of the supporting frame, a drying cylinder is installed at the top of the discharging hopper, and a sealing head is installed at the top of the drying cylinder. And an injection mechanism is rotationally mounted at the top of the sealing head, a driving motor for driving the injection mechanism to be rotationally connected is mounted at the top of the supporting frame, and a feeding mechanism is mounted at the top of the supporting frame. The cleaning mechanism moves on the surface of the inner wall of the drying cylinder, materials which are not dried completely can be prevented from adhering to the inner wall of the drying cylinder to cause the wall hanging phenomenon, after the water content of slurry is stable, the cleaning mechanism moves downwards to reset, scraping cleaning action is formed on the inner wall of the drying cylinder, and stripped wet materials make contact with hot air to be dried again. The device not only avoids the unstable drying phenomenon caused by the change of the water content of the slurry, but also can reduce the heat loss and lower the equipment operation cost.

The invention provides a paint, a coating and a preparation method thereof. The coating comprises a non-metal filler, a metal filler, glaze and a dispersing agent, wherein the metal filler comprises at least one of nickel, chromium, manganese and titanium; the glaze comprises at least one of silicon oxide and aluminum oxide, at least one of boron oxide, sodium oxide and zirconium oxide, and beryllium oxide. The metal filler comprises at least one of nickel, chromium, manganese and titanium, the bonding performance between the metal filler and the metal matrix is high, and a coating prepared from the coating can be firmly bonded with the metal matrix (such as stainless steel). And due to the composition of the glaze, the coating has excellent moisture resistance and corrosion resistance, so that the coating can keep excellent performance in a severe environment, and the thermal shock resistance of the coating is enhanced.

Provided in the present invention is a preparation method for monodisperse nanometer beryllium oxide, comprising the following steps: (S1) uniformly mixing urea and an aqueous formaldehyde solution, adjusting the pH with an organic amine to be weakly alkaline, and adding hydroxyalkyl (meth)acrylate, C12-16 alkyl (meth)acrylate and polyethylene glycol diacrylate to obtain a premix; (S2) adding a water-soluble beryllium salt to the premix, and under an inert atmosphere, adding a water-soluble initiator and slowly raising the temperature to 60-80°C for reaction to obtain a gel precursor; and (S3) after the gel precursor is dried, calcining same, washing same, and filtering same to obtain monodisperse nanometer beryllium oxide. The present invention involves a simple process and low costs, and the obtained beryllium oxide is nanoscale and has a monodisperse particle size.

The invention relates to the technical field of nuclear fuel, in particular to beryllium oxide-based nuclear fuel dressing particles and a preparation method thereof. The nuclear fuel dressing particle comprises a nuclear fuel particle and a beryllium oxide layer located on the periphery of the nuclear fuel particle. The nuclear fuel particle comprises a fuel core, a loose pyrolytic carbon layer, an inner compact pyrolytic carbon layer and a carbide layer which are sequentially arranged from inside to outside. According to the nuclear fuel dressing particle, beryllium oxide is coated on the surface of the nuclear fuel particle, so that the problem that the nuclear fuel particle and a beryllium oxide powder material cannot be uniformly mixed due to large density difference is solved, and the distribution uniformity of the nuclear fuel particle in a beryllium oxide matrix material is remarkably improved; and the serious problems of particle breakage, even failure and the like caused by direct contact of the nuclear fuel particles under high pressure in the compression molding process can be effectively avoided, and the safety of the nuclear fuel particles is greatly improved.

A method for forming an integrated resistance heater. The method includes the steps of: applying a metal layer in a pattern onto a beryllium oxide ceramic body, wherein the pattern of the metal layer is connected to a conductor; forming a pre-assembly by bringing a first surface of a substrate into contact with the metal layer so that the substrate is aligned with the ceramic body, wherein the substrate includes ceramic; and forming a heating element by heating the pre-assembly to a bonding temperature of 800°C to 1900°C to bond the substrate to the ceramic body, wherein the pattern maintains integrity when forming the heating element. The metal layer contains 10% to 100% by weight of niobium.

The present invention relates to the field of inorganic materials technology, and in particular to a method for separating metallic beryllium from the cathode product of a fluoride molten salt electrolysis reaction. The method comprises: adding a refluxing agent to the cathode electrolysis product of the fluoride molten salt electrolysis reaction and remelting the product to obtain agglomerated metallic beryllium; the melting density of the refluxing agent is greater than the density of the metallic beryllium, and the melting point of the refluxing agent is less than the melting point of the metallic beryllium. The addition of the refluxing agent during remelting improves the separation of elemental beryllium and entrained molten salt in the cathode electrolysis product during remelting, thereby resolving the problems of the prior art of preparing metallic beryllium by electrolyzing beryllium oxide in fluoride molten salts, such as the difficulty in separating beryllium and molten salt, and the low purity of the finished beryllium product.

The present invention belongs to the technical field of metallurgical separation and purification, and relates to a beryllium ore smelting process based on a medium and high frequency induction furnace, which comprises the following steps: A. Crushing: Mixing beryllium ore and a flux and then performing crushing, and controlling the particle size of the crushed mixed material to be between 1 mm and 250 mm; B. Batching: Adding a conductive agent to the mixed material, mixing evenly, adding it to the medium and high frequency induction furnace, and introducing nitrogen for smelting, and controlling the frequency of the medium and high frequency induction furnace to be between 4500 Hz and 20000 Hz. The method for smelting beryllium ore by using a medium and high frequency induction furnace proposed by the present invention reduces power consumption and water consumption, and the number of furnace treatments of the crucible is increased by more than 30%; the conversion rate of beryllium in the furnace charge is increased, the conversion rate of beryllium exceeds 99%, and the comprehensive recovery rate of beryllium is increased by more than 12% compared with the conventional sulfuric acid method for beryllium smelting, and the quality requirement of preparing a high-purity beryllium oxide product without adding a purification step for beryllium oxide is successfully achieved.

The invention relates to the technical field of thermal interface materials, in particular to heat-conducting gel based on Cu-based core-shell structure heat-conducting filler and a preparation method of the heat-conducting gel. The component of the heat-conducting gel comprises a heat-conducting filler with a Cu-based core-shell structure, and the core-shell structure of particles in the heat-conducting filler is as follows: copper particles are used as cores, and a high-heat-conductivity compound is used as a shell; the high-thermal-conductivity compound is aluminum nitride, beryllium oxide, aluminum oxide, boron nitride, silicon carbide, zinc oxide, silicon nitride or magnesium oxide. The preparation method of the heat-conducting gel based on the Cu-based core-shell structure heat-conducting filler comprises the following steps: mixing the polymer matrix, the heat-conducting filler and the cross-linking agent in a heating state according to the formula ratio; after cooling, adding a catalyst and mixing; and carrying out vacuum defoaming to obtain the heat-conducting gel. The nano-copper particles with shells with high heat-conducting property are used as the heat-conducting filler, so that the high heat-conducting property of copper can be exerted, the insulativity and oxidation resistance of the heat-conducting filler can be ensured, and the heat-conducting gel has excellent electric conductivity.

The invention belongs to the technical field of semiconductor devices, and particularly relates to a transistor with an improved self-heating effect and a preparation method thereof, and the method specifically comprises the steps: selecting a silicon substrate, and preparing a beryllium oxide heat dissipation layer on the silicon substrate through atomic layer deposition; performing atomic layer deposition on the beryllium oxide heat dissipation layer to prepare an indium oxide channel layer; etching two ends of the indium oxide channel layer to obtain a channel region, wherein a middle non-etched region is a non-channel region; preparing a source electrode and a drain electrode on the channel region; preparing a hafnium oxide gate dielectric layer on the source and drain electrodes and the non-channel region through atomic layer deposition; preparing a top gate electrode on the hafnium oxide gate dielectric layer; and annealing in an oxygen atmosphere. And the beryllium oxide material with high thermal conductivity is introduced as the heat dissipation substrate, so that the stability of the device is improved, the device can normally work under higher working voltage or working current, and the reliability of the transistor is improved.

The invention provides a preparation method of an infrared wavelength selective emitter and the infrared wavelength selective emitter, and the method can comprise the steps: a beryllium oxide layer preparation step: preparing a beryllium oxide layer with a first specified thickness on a substrate, and obtaining a current multi-layer thin film; a first all-dielectric layer preparation step: preparing a first all-dielectric layer on the current multi-layer thin film to obtain an updated current multi-layer thin film; a second all-dielectric layer preparation step: preparing a second all-dielectric layer on the current multi-layer thin film to obtain an updated current multi-layer thin film; and repeating the first all-dielectric layer preparation step and the second all-dielectric layer preparation step to form the first all-dielectric layer and the second all-dielectric layer which are alternately stacked until the thickness of the current multi-layer thin film reaches the set thickness, and obtaining the target infrared wavelength selective emitter. By means of the method, infrared selection can be achieved under the condition that the high-temperature-resistant and oxidation-resistant capacity is high.

A method for thermal management of semiconductor devices provides a semiconductor material. A beryllium oxide (BeO) layer is epitaxially grown over the semiconductor material. A polycrystalline diamond coating is deposited over the BeO layer.

The invention discloses a high-temperature resistant and high-power quick-plug SMP load, comprising an SMP quick-plug female connector, a grounding clamp, a load sheet, an inner core cavity and a cover plate; the SMP quick-plug female connector, the inner core cavity and the cover plate are fixedly connected in sequence; the load sheet is fixed in the inner core cavity through the grounding clamp and is connected to the SMP quick-plug female connector; wherein the load sheet is a beryllium oxide dielectric substrate; a dense resistance film layer is added on the surface of the beryllium oxide dielectric substrate, and the scheme can achieve high power and high temperature resistance performance by arranging the load sheet in the inner core cavity and adding a dense resistance film layer on the load sheet; secondly, the structure of the scheme is very convenient to assemble, and can be quickly plugged in and out through the SMP quick-plug female connector.

An integral resistance heater is disclosed. The heater includes a beryllium oxide (BeO) ceramic body having a first surface and a second surface. A heating element is formed from a metal foil or metallizing paint and is printed onto the top or second surface of the beryllium oxide ceramic body.

The invention relates to the technical field of metal beryllium manufacturing, in particular to a preparation method of high-purity metal beryllium with beryllium oxide as a raw material. According to the preparation method of the high-purity metal beryllium with the beryllium oxide as the raw material, a compound of calcium hydride, silicon carbide and aluminum oxide serves as a reducing agent, the 2N-level high-purity metal beryllium is prepared through reaction at the temperature of 1300-1500 DEG C, and the yield is 75% or above. The industrial production potential is realized. According to the invention, beryllium fluoride is not used as a raw material any more, and a novel metal beryllium preparation process is developed.

The invention relates to a fine-grain beryllium oxide ceramic film substrate and a preparation method thereof, belongs to the technical field of ceramics, and is used for solving at least one of the problems of large average grain size, high surface roughness, low heat conductivity, low breaking strength at room temperature and the like of a beryllium oxide ceramic substrate prepared by the existing method. The fine-grain beryllium oxide ceramic film substrate is prepared from the following raw materials in parts by weight: 99 to 99.5 parts of nano beryllium oxide, 0.2 to 0.5 part of magnesium aluminum silicate and 0.2 to 0.3 part of nano silicon dioxide. Through the synergistic effect of the nano beryllium oxide, the magnesium aluminum silicate and the nano silicon dioxide and the specific proportion, the volume density, the heat conductivity and the breaking strength of the beryllium oxide ceramic substrate are improved, and the grain size is reduced.

The invention discloses a preparation method of a beryllium oxide ceramic crucible, belongs to the technical field of preparation of beryllium oxide ceramic crucibles, and solves the problems of high energy consumption of high-temperature sintering, coarse grains and easy cracking in preparation of beryllium oxide ceramic crucibles in the prior art. The preparation method comprises the following steps: preparing a citric acid solution; the preparation method comprises the following steps: weighing beryllium oxide powder, MgO-Al2O3 and polyvinyl alcohol; beryllium oxide powder, MgO-Al2O3, polyvinyl alcohol and a citric acid solution are mixed and subjected to ball milling, and mixed slurry is obtained; carrying out cold pressing sintering on the mixed slurry to obtain a green body; and carrying out heat treatment strengthening on the green body to obtain the beryllium oxide ceramic crucible. The beryllium oxide ceramic crucible prepared by the method is high in density, high in purity and fine in crystal grain.

The photoelectric detector comprises a germanium thin film layer and a silicon dioxide dielectric layer which are arranged on an SOI (Silicon On Insulator) substrate, and the silicon dioxide dielectric layer covers the germanium thin film layer; the beryllium oxide interface passivation layer is arranged between the germanium thin film layer and the silicon dioxide dielectric layer, the germanium thin film layer in contact with the beryllium oxide interface passivation layer is provided with a germanium surface subjected to 850-950 DEG C high-temperature treatment, and the beryllium oxide interface passivation layer is formed at the low temperature of 188-212 DEG C; and the thin film layer which has a compact crystal structure of Be-O covalent bonds and is conformal with the surface of the germanium thin film layer and is 6-20nm in thickness after being subjected to medium-temperature treatment at 500-600 DEG C. The beryllium oxide interface passivation layer is arranged, so that the dark current of the photoelectric detector can be further reduced on the premise that the responsivity of the detector is not obviously influenced.

A power amplifier packaged by multiple layers of ceramics comprises a closed tube shell and a power amplifier circuit arranged on a base in the closed tube shell, and is characterized in that the closed tube shell is formed by connecting the base, an outer shell and a cover plate in a sealed mode, the outer shell is made of multiple layers of ceramic materials and internally provided with a plurality of tube shell leading-out ends, a beryllium oxide substrate is fixed on the base, and the beryllium oxide substrate is fixed on the cover plate. An operational amplifier, a triode and a resistor of the power amplifier circuit are respectively adhered to corresponding copper conduction bands through high-thermal-conductivity silver paste and are electrically connected through silicon-aluminum wires, and the copper conduction bands are respectively sintered and fixed on a beryllium oxide substrate. The power amplifier has the advantages that the performance of the power amplifier circuit can be combined with high thermal conductivity, the heat dissipation performance of a product can be effectively improved, and the power amplifier can be suitable for the working environment of-55 DEG C to 125 DEG C; and meanwhile, a lead-free packaging structure is adopted by the closed tube shell, so that the welding space volume of the product can be effectively reduced.

The invention discloses a method for preparing a beryllium cast ingot by recycling beryllium cloth bag powder waste, and belongs to the technical field of material recycling, the method comprises the following steps: sequentially carrying out acid washing suction filtration, water washing suction filtration and absolute ethyl alcohol cleaning suction filtration on the beryllium cloth bag powder waste with the beryllium content greater than 90% to obtain wet beryllium cloth bag powder with the beryllium content greater than 96%; pressing the wet beryllium cloth bag powder into a cloth bag powder cake, and performing vacuum drying; after the vacuum-dried cloth bag pressed powder and beryllium beads are placed in a beryllium oxide crucible of a vacuum melting furnace, vacuum melting is conducted under the protection of argon, and beryllium cast ingots are obtained; and naturally cooling the beryllium cast ingot to room temperature, and washing with water. The pure beryllium cast ingot prepared through the method is low in impurity element content and high in purity, the raw material use requirement of pure beryllium powder metallurgy can be met, the amount of cloth bag powder waste capable of being recycled at a time is large, beryllium bead raw materials are saved, and the current situation that beryllium raw material supply is short is relieved.

The present invention belongs to the field of slurry technology and relates to the application of beryllium oxide in slurry development. The present invention provides the application of beryllium oxide in slurry development, the slurry includes glass powder and a carrier, wherein the preparation method of the carrier is: beryllium oxide and an additive are mixed according to a mass ratio of 1:1.5-2, placed in a mixer and blended for 2-6h to obtain; the additive is composed of polyamide, isooctyl alcohol, polydimethylsiloxane and terpineol. The interaction and synergistic effect between these components of the present invention enable the slurry to maintain stable performance under extreme conditions, and can also resist the erosion of corrosive substances, thereby improving the stability and reliability of electronic devices.