33 results about "Beryllium oxide" patented technology

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.

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.

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.

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 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.

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 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 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 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 application belongs to the technical field of porous ceramic manufacturing, and particularly relates to a preparation method of a porous beryllium oxide ceramic sheet. The application is prepared by specific monomers and monomer proportions to obtain granular polymer modified polyvinyl acetal with a specific particle size of 5-8 microns. Then, beryllium oxide powder, a sintering aid and the polymer modified polyvinyl acetal are ball milled, and then cold isostatic pressing is performed. The polymer modified polyvinyl acetal ball milling simultaneously serves as a binder and a pore forming agent. After forming, sintering is performed. A large number of uniform pore structures are formed in the sintering process, excellent electrical properties are provided, and good mechanical properties are maintained.

The application discloses a double-layer coated soft magnetic composite material, which comprises a soft magnetic powder, and the surface of the soft magnetic powder is sequentially coated with an inorganic insulating layer and an organic insulating layer; raw materials of the inorganic insulating layer comprise an inorganic powder, a silane coupling agent and a dispersing agent; raw materials of the organic insulating layer comprise a thermosetting resin and a curing agent; the soft magnetic powder is one of a cobalt-based soft magnetic powder, a zirconium-based soft magnetic powder, an iron-based soft magnetic powder and a nickel-based soft magnetic powder; and the inorganic powder comprises one or a combination of several of calcium oxide, barium oxide, beryllium oxide, zirconium oxide, tungsten carbide, carbonate and silicate. The application further discloses a preparation method of the double-layer coated soft magnetic composite material. The obtained double-layer coated soft magnetic composite material not only has high magnetic permeability and resistivity, but also has excellent high-temperature resistance, high-pressure resistance, corrosion resistance and loss resistance.

An electrostatic chuck includes a ceramic top plate layer made of a beryllium oxide material, a ceramic bottom plate layer made of a beryllium oxide material, a ceramic middle plate layer disposed between the ceramic top plate layer and the ceramic bottom plate layer, an electrode layer disposed between the ceramic top plate layer and the ceramic middle plate layer, and a heater layer disposed between the ceramic middle plate layer and the ceramic bottom plate layer. The electrode layer joins and hermetically seals the ceramic top plate layer to the ceramic middle plate layer, and the heater layer joins and hermetically seals the ceramic middle plate layer to the ceramic bottom plate layer.

The invention discloses a high-thermal-conductivity insulating pouring adhesive for a large-scale motor, a preparation method and application, and the preparation method comprises the following steps: step 1, mixing high-purity nanoscale beryllium oxide powder and micron-sized spherical inorganic filler in proportion, stirring, heating, preserving heat and cooling to obtain beryllium composite microspheres with high thermal conductivity; 2, mixing the beryllium composite microspheres obtained in the step 1 with an inert dispersant and a surface modifier, and stirring at a specific temperature to perform a modification reaction; after the reaction is completed, sequentially performing filtering, drying and ball milling treatment to obtain surface-modified beryllium composite microspheres with high thermal conductivity; and step 3, adding the surface-modified beryllium composite microspheres obtained in the step 2 into an insulating resin matrix as a heat-conducting filler to prepare the high-heat-conductivity insulating pouring adhesive. Compared with aluminum oxide, boron nitride and the like, the thermal conductivity of added beryllium oxide is increased; compared with the addition of pure beryllium oxide, the beryllium composite microsphere provided by the invention has the advantage that the use amount of beryllium oxide is reduced, so that the cost is greatly reduced.

This invention discloses a high-temperature resistant beryllium copper oxide alloy for switches and its preparation process. The alloy composition, by weight percentage, includes: Be: 1.30%–1.60%, Co: 0.80%–1.20%, Ni: 0.40%–0.60%, Si: 1.80%–2.00%, Cr: 2.20%–2.50%, Al: 1.20%–1.50%, Ti: 2.30%–2.60%, Mg: 0.30%–0.50%, Zr: 0.030%–0.050%, RE: 0.022%–0.028%, Pb ≤ 0.003%, Sn ≤ 0.003%, and the total amount of other impurity elements ≤ 0.01%, with the balance being Cu. The total amount of other unavoidable impurity elements ≤ 0.01%, with the balance being Cu. The preparation process includes batching, smelting, hot rolling, cold rolling, and secondary aging treatment, resulting in the in-situ formation of a dense composite oxide film on the alloy surface. This invention significantly improves the high-temperature strength and high-temperature oxidation resistance of the alloy through the synergistic effect of Be-strengthened alloy and multiple antioxidant elements. The finished strip exhibits a yield strength ≥880MPa, tensile strength ≥1000MPa, elongation ≥7%, and oxidation rate ≤8×10⁻⁶ at 300℃. ‑5 mg / (cm 2 ·h), a high-reliability switching element suitable for high-temperature environments.

The application discloses a high-crystalline-water-content aluminum ammonium alum slag resourceful treatment method, which comprises the following steps: putting aluminum ammonium alum slag and silicon dioxide powder into a microwave reactor, wherein the aluminum ammonium alum slag is produced in a beryllium oxide smelting process, the main component of the aluminum ammonium alum slag is NH4Al(SO4)2·12H2O, and the water content of the aluminum ammonium alum slag is 40%-50%, and then performing microwave heating to obtain dried aluminum ammonium alum slag; and then performing high-temperature calcination to obtain a calcined sample which can be applied to the preparation of refractory materials. The method can realize efficient dehydration of the aluminum ammonium alum slag, effectively solve the problem of material puffing in the heating process and affect the treatment efficiency, greatly reduce the Be content of the leaching toxicity of the calcined product, has the advantages of good drying effect, short treatment process, full-component resource utilization, and meets the requirements of safe, efficient and green treatment of the aluminum ammonium alum slag.

The invention belongs to the technical field of electronic paste, and discloses electronic paste for a beryllium oxide matrix and a preparation method of the electronic paste. The electronic paste is composed of the following components in percentage by mass: 60-75% of a metal functional phase, 10-20% of a glass phase, 2-5% of a binder, 10-20% of a solvent and 0.7-2% of an auxiliary agent. The sintering temperature of the electronic paste is 1650 DEG C and is slightly lower than that of a BeO ceramic substrate which is larger than or equal to 1900 DEG C, the forming state of the substrate cannot be changed, the electronic paste and the substrate can form a chemical bonding transition phase, and the interface bonding strength is remarkably improved. The difference between the thermal expansion coefficients of the functional layer prepared from the electronic paste and the BeO substrate is lower than 2.5 ppm / K, the interface thermal stress can be reduced, the number of thermal cycles is remarkably increased, and the anti-cracking 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.

This invention discloses a beryllium oxide-coated intermediate package and its preparation method, relating to the field of intermediate package coating preparation technology. The preparation method includes: step S1, preparing a first mixture with phosphoric acid and deionized water, then adding beryllium oxide powder and an antifoaming agent to obtain a beryllium oxide dispersion; step S2, immersing the sandblasted intermediate package in the beryllium oxide dispersion for 2-3 coating treatments; and step S3, calcining the coated intermediate package to obtain an intermediate package with a beryllium oxide coating of 1.5-2.0 mm thickness. This invention first uses phosphoric acid as a binder to prepare the beryllium oxide dispersion, and then obtains a beryllium oxide-coated intermediate package by repeatedly coating the inner wall of the inexpensive intermediate package with the beryllium oxide dispersion followed by calcination. This method can resist the thermal shock of molten beryllium metal and ensure the purity of the beryllium powder.

The utility model relates to a glass cover plate with a multi-layer composite protection structure. The glass cover plate comprises a glass substrate; the composite coating is positioned on the front surface of the glass substrate and sequentially comprises a chromium carbide layer, a beryllium oxide layer and a nickel-3 aluminum layer from inside to outside; the composite structure layer is positioned in a frame area on the back surface of the glass substrate and sequentially comprises a photosensitive color-changing ink layer and an aluminum nitride layer from inside to outside. The thickness of the chromium carbide layer is 20-50nm, the thickness of the beryllium oxide layer is 10-20nm, and the thickness of the nickel-3 aluminum layer is 5-15nm. The Vickers hardness of the chromium carbide layer is larger than or equal to 2500 HV, and the surface roughness Ra is smaller than or equal to 0.05 micrometer. The refractive index of the beryllium oxide layer ranges from 1.65 to 1.72, and the chemical stability meets the requirement that the beryllium oxide layer is not corroded after being soaked in a 5% NaOH solution for 24 hours According to the layered structure of the coating layer of the cover plate provided by the utility model, various high-performance materials are ingeniously fused, and a composite protective layer is formed through layer-by-layer superposition. The material of each layer has a synergistic effect, so that not only is the physical performance of the cover plate optimized, but also the cover plate is endowed with unique visual characteristics and environment-friendly adaptability, and revolutionary improvement is brought to the appearance design and user experience of electronic products.

A catheter system (100) for treating a treatment site (106) within or adjacent to a blood vessel (108) includes a power source (124), a light guide (122), and a plasma target (242). In various embodiments, the light guide (122) receives power from the power source (124). The light guide (122) has a distal tip (244), and the light guide (122) emits light energy (243) in a direction away from the distal tip (244). The plasma target (242) is spaced apart from the distal tip (244) of the light guide (122) by a target gap distance (245). The plasma target (242) is configured to receive light energy (243) from the light guide (122) such that plasma bubbles (234) are generated at the plasma target (242). The power source (124) may be a laser, and the light guide (122) may be an optical fiber. The catheter system (100) may also be an inflatable balloon (104) surrounding the distal tip (244) of the light guide (122). The plasma target (242) may have a target surface (1672) that receives the light energy (243) from the light guide (122). The plasma target (242) may be formed from one or more of tungsten, tantalum, platinum, molybdenum, niobium, iridium, magnesium oxide, beryllium oxide, tungsten carbide, titanium nitride, titanium carbonitride, and titanium carbide.

A reactor unit cell is disclosed including a graphite moderator structure, a heat pipe positioned in the graphite moderator structure, and a fuel assembly positioned in the graphite moderator structure. The fuel assembly comprises a beryllium-oxide sleeve and nuclear fuel positioned in the beryllium-oxide sleeve.

The invention discloses a high-gain copper beryllium alloy secondary electron emitter and a preparation method thereof, and relates to the technical field of material preparation, and the preparation method comprises the following steps: carrying out pulse electrolytic polishing surface pretreatment on a punch-formed copper beryllium alloy base material, then putting the copper beryllium alloy base material subjected to surface pretreatment into a tubular furnace, and heating the tubular furnace to obtain a copper beryllium alloy secondary electron emitter; after argon and hydrogen mixed gas is introduced for gas washing, vacuumizing is conducted, then the tubular furnace is heated, low-oxygen-pressure thermal activation treatment is conducted on the copper-beryllium alloy base material in two steps, a beryllium oxide active layer with the high secondary electron emission coefficient is formed on the surface, and the high-gain copper-beryllium alloy secondary electron emitter is obtained. The beryllium oxide active layer is uniform, compact and low in roughness, the copper beryllium alloy secondary emitter is high in secondary electron emission coefficient and stable in performance, and the problem that a conventional copper beryllium alloy secondary electron emitter is insufficient and unstable in performance is effectively solved.

The application belongs to the technical field of metallurgy and relates to a pretreatment method of a beryllium sulfate solution containing fluorine, which comprises the following steps: S1, defluorination: adjusting the pH of the beryllium sulfate solution containing fluorine to 0.5-1.5 by using sodium alkali, heating to 85-95 DEG C and reacting for 90-150 min, adding a reducing agent and a defluorination agent, and filtering to obtain defluorination liquid and cryolite slag; S2, iron removal by oxidation: slowly adding an oxidizing agent to the defluorination liquid, heating to 88-95 DEG C and reacting for 16-24 h, and filtering to obtain iron removal by oxidation liquid and goethite slag; and S3, oil removal by activated carbon: adding activated carbon to the iron removal by oxidation liquid, removing oil at 45-50 DEG C for 35-45 min, and filtering to obtain a pretreatment liquid of the beryllium sulfate solution. The application applies the cryolite defluorination method and the goethite method to the pretreatment of the beryllium sulfate solution, and compared with the conventional sulfuric acid method, the amount of aluminum removal slag and iron removal slag is greatly reduced, and the requirement that high-purity beryllium oxide can be obtained without purification of beryllium oxide is realized.

The invention discloses a beryllium-oxide-based nuclear fuel element and a preparation method thereof.The beryllium-oxide-based nuclear fuel element comprises a fuel zone, the fuel zone comprises nuclear fuel dressing particles and a beryllium-oxide matrix, the beryllium-oxide matrix wraps the nuclear fuel dressing particles, the nuclear fuel dressing particles comprise nuclear fuel coating particles and beryllium-oxide layers, and the beryllium-oxide coating particles are coated with the beryllium-oxide matrix. The beryllium oxide layer wraps the nuclear fuel coated particles; and the fuel-free area wraps the fuel area. The fuel-free area is arranged on the surface of the fuel area, so that the problem that fuel particles in a nuclear fuel element without the fuel-free area are exposed and are damaged by external force is solved, the service stability and reliability of the beryllium oxide-based nuclear fuel element are improved, and the safety of a small modular reactor is improved. Meanwhile, beryllium oxide also has relatively high moderation capability and thermal conductivity, fast neutrons generated by nuclear fission can be moderated in time, and heat is efficiently transferred to the coolant.

The present invention relates to the technical field of beryllium-aluminum alloy powder preparation, and provides nano beryllium oxide strengthened beryllium-aluminum alloy powder, a preparation method, and a use. The method comprises the following steps: step S1, sequentially placing nano beryllium oxide, an aluminum block, and a beryllium ingot into a crucible in a vacuum container for melting, and then performing uniform stirring to obtain a melt; step S2, pouring the melt into a thermal insulation package above an atomization nozzle, wherein the melt flows out through a flow guide pipe at the bottom of the thermal insulation package, and when passing through the atomization nozzle, meets with high-pressure argon to be atomized into tiny droplets, and in an atomization tower, the droplets are rapidly solidified into spherical nano beryllium oxide-containing beryllium-aluminum alloy powder; and step S3, on the basis of powder particle sizes, classifying the nano beryllium oxide-containing beryllium-aluminum alloy powder into grade-1 powder, grade-2 powder and grade-3 powder. In the present invention, the beryllium-aluminum alloy powder is prepared by a method of first melting aluminum in vacuum, and then introducing inert gas to continue to melt beryllium, thereby reducing the content of oxygen in the powder and preventing aluminum evaporation.

A method for manufacturing a semiconductor substrate. The method includes providing a single-crystal diamond base layer. Then, the method forms a beryllium oxide (BeO) layer on the single-crystal diamond base layer. Then, the method forms a gallium nitride (GaN) layer on the BeO layer. In some embodiments, the method forms a surfactant on the single-crystal diamond base layer and the BeO layer.

The invention discloses an aluminum nitride ceramic material and a preparation method thereof.The preparation method comprises the steps that S100, a first doped sintering aid and a second doped sintering aid are mixed according to a preset proportion, a first mixture is obtained through wet ball milling, the first doped sintering aid comprises a first component and a second component, the first component is beryllium oxide, and the second component is aluminum oxide; the second component is selected from one of magnesium oxide and yttrium oxide, the ball milling medium is an alcohol compound, and the second doped sintering aid is used for bonding the aluminum nitride powder and the first aid; s200, drying the first mixture and separating to obtain a second mixture of which the particle size is less than or equal to 100 microns; and S300, carrying out dry pressing molding on the second mixture, and sintering in a nitrogen atmosphere to obtain the aluminum nitride ceramic material. According to the invention, different components in the auxiliary agent generate action mechanisms with different affinity to oxygen impurities, so that the high-performance aluminum nitride ceramic is obtained.

The invention relates to the technical field of metal beryllium manufacturing, in particular to a method for preparing metal beryllium by taking beryllium oxide as a raw material and improving the yield. According to the preparation method of the high-purity metal beryllium with the beryllium oxide as the raw material, calcium hydride, silicon carbide and calcium-magnesium alloy serve as compound reducing agents, calcium fluoride and aluminum oxide serve as compound fluxing agents, the metal beryllium is prepared through a reaction at the temperature of 1300-1400 DEG C, then the beryllium phase and the slag phase are rapidly separated through the melting centrifugal technology, the separation efficiency is high, and the purity is high. And the direct yield of the metal beryllium is obviously improved.

An absorber-reflector unit 100 for a nuclear reactor control drum (200, Fig. 9), comprises: a neutron-reflecting material 20, e.g. nuclear-grade graphite, beryllium oxide or aluminium oxide; a neutron