355 results about "Beryllium oxide" patented technology

A wavelength conversion device, a manufacturing method thereof, and a related illumination device. The wavelength conversion device comprises a fluorescent powder layer (110) that is successively stacked, a diffuse reflection layer (120), and a high-thermal-conductivity substrate (130). The diffuse reflection layer (120) comprises white scattered particles for scattering the incident light; the high-thermal-conductivity substrate (130) is one of an aluminum nitride substrate, a silicon nitride substrate, a silicon carbide substrate, a boron nitride substrate, and a beryllium oxide substrate. The wavelength conversion device has good reflectivity and thermal stability.

A pulsed, Q-switched, waveguide CO2 laser includes a plurality of waveguide channels formed in a block of a beryllium oxide ceramic material and is operated at a wavelength between about 9.2 and 9.7 micrometers. The laser has an output power up to 55% greater than that of a similarly configured laser, operated at the same wavelength and pulse conditions, but wherein the waveguide channels are formed in a block of an alumina ceramic material.

The invention relates to a high thermal conductivity polyimide film. The high thermal conductivity polyimide film is prepared from 80-99 wt% of reaction monomer mixtures and 1-20 wt% of nanometer material slurry; the reaction monomer mixtures are composed of amine monomers and anhydride monomers, and the mole ratio of the amine monomers to the anhydride monomers is 1:1-1.15; the nanometer material slurry is prepared from 30-40 wt% of aprotic polar solvent, 50-66 wt% of inorganic nano-materials, 2-5 wt% of dispersing agents and 2-5 wt% of coupling agents, wherein the inorganic nano-meterials adopt one of or several of beryllium oxide, mica, boron nitride, aluminum oxide, diamond, magnesium oxide and graphite; the thermal conductivity coefficient of the high thermal conductivity polyimide film is set as 1-5 Wm-1k-1, and the glass transition temperature is set at 300-380 DEG C. The inorganic nano-materials with the high thermal conductivity are added in the formula of the polyimide film, therefore, the thermal conductivity performance of the polyimide film is improved, the thermal conductivity coefficient of the polyimide film is increased to 1-5 Wm-1k-1 from the original 0.2 Wm-1k-1, and meanwhile the glass transition temperature is lowered to 300-380 DEG C from 400-420 DEG C.

The invention discloses highly fire-resistant foundry sand for steel casting and a preparation method of the highly fire-resistant foundry sand. The highly fire-resistant foundry sand is prepared from the following raw materials in parts by weight: 50-80 parts of fused ceramite, 10-15 parts of high-alumina cement, 17-23 parts of sludge dry powder, 20-30 parts of volcanic tuff, 15-25 parts of dickite, 16-22 parts of natural manganese sand, 8-12 parts of nacrite, 10-15 parts of asbestos powder, 5-10 parts of aluminum dihydrogen tripolyphosphate, 10-15 parts of modified bentonite, 4-8 parts of alumn powder, 3-6 parts of cellulose glycolate, 2.5-4.5 parts of corn syrup, 4.5-6.5 parts of beryllium oxide, 3-5 parts of China wood oil, 4-6 parts of sodium metasilicate, 2-4 parts of polyethylene glycol and an appropriate amount of water. Compared with conventional foundry sand, the highly fire-resistant foundry sand provided by the invention is not only excellent in fire-resistant performance, can maintain a higher strength and relatively low thermal expansion coefficient under high temperature, does not easily cause expansion and breakage, has excellent plasticity, air permeability and collapsibility, can remarkably improve the surface quality of castings and improve the finished product rate of castings.

The present invention discloses an alumina fiber reinforced alumina ceramic matrix composite and a preparation method thereof, the alumina fiber reinforced alumina ceramic matrix composite is characterized by comprising the following raw materials by weight: 40-60 parts of alumina, 20-30 parts of clay, 10-15 parts of modified alumina fiber, 2-3 parts of antimony sulfide, 1-3 parts of beryllium oxide, 0.03-0.05 part of methyl ethyl ketone peroxide, 3-5 parts of vinyl acetate, 0.2-0.4 part of silane coupling agent KH550, 1-2 parts of microcrystalline wax, 1-2 parts of carboxymethyl cellulose, 20-30 parts of ethanol, and 30-40 parts of deionized water; the antioxidant treated alumina fiber added in the alumina fiber reinforced alumina ceramic matrix composite is used as a ceramic reinforcing phase, and has the characteristics of ceramic toughness reinforcing properties, mechanical properties, abrasion resistance, hardness and high temperature resistance, the gel casting technology used in the method can reduce the production cost, and improve the material integrity and machinability, and any shape and size of ceramic structural workpieces can be convenient to produce.

The invention discloses a low temperature co-fired ceramic material which mainly comprises high heat conductivity ceramic materials such as beryllium oxide, carborundum and so on, as well as borosilicate series powder glass materials.

The invention discloses a method for extracting beryllium oxide from low-grade beryllium ore. The method is characterized by comprising the following steps of: grinding the low-grade beryllium ore, pelletizing, drying, roasting, and crushing to obtain a roasted material; adding concentrated sulfuric acid, stirring, leaching, and separating to obtain acidified liquid and acidified slag; adding the acidified liquid into the other roasted material, and stirring and leaching to obtain primary steep and primary leaching residue; adding concentrated sulfuric acid into the primary leaching residue, adding water, and stirring and leaching to obtain secondary steep and secondary leaching residue, wherein the acidified liquid is replaced by the secondary steep for recycling; extracting the primary steep by adopting an extracting agent in a volume ratio of phosphors extracting agents: alkanol: kerosene of (25-45):(5-1):(50-70) to obtain a beryllium-loaded organic phase and raffinate; washing the beryllium-loaded organic phase by adopting solution of oxalic acid, and performing back extraction by using solution of NaOH to obtain a blank organic phase and stripping solution; and regulating the concentration of hydroxyl ions in the stripping solution to ensure that beryllium is hydrolyzed and precipitated, and calcining a precipitate to obtain the beryllium oxide. The method is easy to operate, the cost is low, the beryllium oxide with the content of over 97 percent is obtained, and the recovery rate of the beryllium is about 80 percent. The method is suitable for extracting the beryllium oxide from low-grade beryllium ore with low BeO content and high CaF2 content.

The invention belongs to the technical field of electronic materials. Multi-element doped high-performance beryllium oxide ceramic material, in addition to beryllium oxide, also includes 0.2-0.6% by mass of multi-element dopant; said multi-element dopant is composed of MgO, Al2O3, SiO2, CaO, ZnO and rare earth oxides , the mass percentage content of each component is: MgO: 5-60%, Al2O3: 0-40%, SiO2: 20-95%, CaO: 0.1-0.5%, ZnO: 0-0.5%, containing Y, La, Single or random mixed rare earth oxides of Ce or Sm: 0.01-0.5%. The multi-element dopant is prepared by a sol-gel method, and then mixed with a high-purity beryllium oxide raw material, shaped and sintered at a high temperature to obtain the multi-element doped high-performance beryllium oxide ceramic material of the present invention. The multi-component doped high-performance beryllium oxide ceramic material provided by the invention has lower sintering temperature, higher density, thermal conductivity and mechanical properties; its microstructure has the characteristics of compactness, uniform crystal grains and few pores. The preparation method has simple process, low production cost and good repeatability, and is suitable for industrialized production.

The invention discloses a chemical metallurgy method for extracting beryllium oxide from chrysoberyl. The chemical metallurgy method is a comprehensive treatment technology for carrying out chemical metallurgy on refractory chrysoberyl with not more than 0.5% of Be. The chemical metallurgy method is characterized by comprising the following steps of: carrying out structural transformation roasting on the minerals by using ammonium fluosilicate as a structural transforming agent in the presence of activator limestone; cooling the roasted minerals and using water to spray dump leaching beryllium; precipitating beryllium for the ammonium fluoroberyllate solution by using ammonium bicarbonate to obtain basic beryllium carbonate; calcining the basic beryllium carbonate to release carbon dioxide and water vapor to obtain the product beryllium oxide; and concentrating and crystallizing a beryllium-precipitated solution which is the beryllium fluoride solution under reduced pressure, and drying the concentrated and crystallized solution in air flow to obtain the product ammonium fluoride. The chemical metallurgy method disclosed by the invention is simple in process, low in price, free of pollution, high in metal recovery rate, low in production cost and capable of effectively separating and extracting beryllium in the chrysoberyl.

The invention discloses a cleaning process of beryllium oxide ceramic. The process has the following process flow of: preparing oil-removing solution, removing oil with ultrasonic waves, filtering the solution and treating scrap materials, cleaning with flowing water, cleaning with the ultrasonic waves, drying, and taking the beryllium oxide ceramic out. The cleaning process is simple, easy to realize and low in cost; toxic dust attached to the beryllium oxide can be effectively washed off; and the hurt to a human body caused by the beryllium oxide is reduced.

The invention provides a COB type LED packing piece based on beryllium oxide ceramic substrate and production method, and the packing piece comprises a substrate made of the beryllium oxide ceramic board, a box dam and two symmetrical electrodes are formed on the substrate; a plurality of series circuits not crossed to each other and composed of light-emitting diode are formed in the substrate solid crystal region, two ends of each series circuit are respectively connected to two electrodes, the fluorescent powder glue is fixedly sealed in the box dam. The COB type LED packing piece based on beryllium oxide ceramic substrate is prepared by the steps as follows: cleaning beryllium oxide ceramic board, screen-printing the electrode, high temperature sintering, manufacturing the box dam, baking and dehumidifying, plasma cleaning, pasting LED chip, baking, bonding, baking, coating fluorescent powder glue in the box dam and solidifying, blanking, spectral testing, packaging and putting in storage. The beryllium oxide substrate is applied to the LED in the LED packing piece with good heat radiation capability, the high power LED packing product is small in volume, light in weight and high in reliability.

The invention discloses a preparation method of a beryllium oxide modified uranium dioxide nuclear fuel. The preparation method comprises the following steps: extremely uniformly coating the surfaces of UO2 particles with BeO micro-powder through a spheroidizing and cladding technology, shaping the coated UO2 particles to make BeO extremely uniformly dispersed in a UO2 matrix, and carrying out high temperature sintering for a long time to locally melt the BeO in UO2 particle gaps and realize intercommunication in order to form a three-dimensional network structure and finally obtain the BeO modified UO2 nuclear fuel containing uniform distributed BeO and having a BeO and UO2 matrix formed interpenetrating network structure. The BeO enhancement phase of the three-dimensional network structure provides a rapid channel for heat conduction, so the heat conductivity of a BeO/UO2 composite core is maximally improved; and the UO2 matrix and the BeO of the three-dimensional network structure are interlaced, and can well support and constrain the BeO enhancement phase in a high temperature radiation environment, so the high temperature stability and the radiation resistance of the core are well guaranteed.

The invention discloses a preparation method of fusion reactor cladding neutrons and tritium breeding agent beryllium acid lithium pellets. The preparation method of the fusion reactor cladding neutrons and tritium breeding agent beryllium acid lithium pellets comprises the following steps: preparing a beryllium acid lithium material, representing, preparing beryllium acid lithium pellets with the diameter of 1mm, detecting performances, preparing lithium hydroxide and beryllium oxide raw materials at room temperature, putting into a container according to the proportion of 1 of Li/Bi molecule mole ratio, rotating and stirring for about 20 hours, mixing fully and uniformly, putting dried gel in a sintering furnace, warming to 1073K under an air environment, forging for 5 hours, and carrying out solid phase reaction fully; taking a beryllium acid lithium sample, grinding fully into particles, analyzing the formation of components by adopting XDR (external data representation; analyzing the Li/Bi mole ratio by adopting ICP-AES (inductively coupled plasma-atomic emission spectrometry). According to the invention, the problem that when lithium silicate or lithium titanate pellets are originally adopted as breeding agents, a plurality of layers of beryllium zone breeding neutrons are required to be arranged in a cladding is overcome, so that the utilization efficiency of breeding agents in a limited space of the cladding is improved extremely, and the fusion reactor tritium self-sustaining difficulty can be solved effectively.

The invention discloses a rapid preparation method of beryllium oxide-enhanced uranium dioxide nuclear fuel. The preparation method comprises preparing BeO-coated UO2(UO2/BeO) core-shell structure particles through SPS low-temperature rapid pre-sintering granulation, spheroidization and coating processes, and carrying out SPS rapid sintering on the core-shell structure particles to obtain a UO2/BeO composite nuclear fuel pellet. The preparation method is fast and efficient. The beryllium oxide-enhanced uranium dioxide nuclear fuel can solve the problem that the existing UO2 fuel pellet has low thermal conductivity.

The invention discloses a ceramic substrate for LEDs. Various raw materials used in the LTCC preparation technology are optimized, aluminum nitride, boron nitride, alumina and beryllium oxides serve as the main raw materials, meanwhile, glass sintering additives, copper and aluminum alloy nano-particles, rare earth oxides, solvents, plasticizer, dispersant, binder and other additives are added, and the physical and chemical properties of the ceramic substrate are further optimized. The thermal conductivity of the ceramic substrate is larger than 400 W/(m*k), the bending strength is larger than 300 Mpa, and the dielectric constant is smaller than 2. Meanwhile, due to a conventional LTCC preparation method, the main raw materials and the additives can be prepared into the high-conductivity ceramic substrate, the preparation technology is simple, and industrialization is facilitated.

The invention relates to a self-lubricating wear-resistant ceramic for cutting tools, which is prepared from the following raw materials in parts by weight: 2-3 parts of bismuth sulfide, 2-3 parts of diethanolamine, 2-3 parts of ammonium sulfate, 2-3 parts of magnesium chloride, 2-3 parts of calcium carbide sludge, 2-3 parts of graphene oxide, 0.6-0.8 part of KOH, 0.2-0.3 part of polyoxyethylene castor oil, 3-4 parts of magnesium oxide, 36-40 parts of titanium boride, 4-5 parts of nano tungsten trioxide, 30-35 parts of titanium carbide, 3-5 parts of beryllium oxide, 1-2 parts of silver powder, a right amount of ethanol, a right amount of deionized water, 1-1.5 parts of polyacrylic acid, 1.2-1.6 parts of polyethyleneglycol and 4-5 parts of antiwear assistant. The added nano tungsten trioxide enhances the high temperature resistance of the ceramic. The ceramic has the characteristics of high temperature resistance, high carrying capacity, self lubrication, thermal shock resistance, high wear resistance and the like, and is suitable for manufacturing cutting tools. The antiwear assistant can enhance the wear resistance and heat resistance of the ceramic.

The invention discloses a heat-flow meter for measuring heat flux of aluminium oxide inside a solid rocket engine dynamically in real-time. The heat-flow meter comprises a heat-flow meter body including a cylindrical heat-sink copper piece and a constantan piece that are arranged coaxially. A thermal-insulation ceramic plate that is used for cooling high-temperature heat flux at the surface of the constantan piece is arranged at the top of the constantan piece coaxially; and the outer sides of the thermal-insulation ceramic plate, the constantan piece, and the heat-sink copper piece are coated with a beryllium-oxide ceramic housing and the thermal-insulation ceramic plate is fixed at the top of the constantan piece by the beryllium-oxide ceramic housing. The beryllium-oxide ceramic housing is used for guiding one part of heat flux to the matrix of the heat-sink copper piece. A heat-sink copper hole is formed along the axis direction inside the heat-sink copper piece; and a thermocouple for measuring the top temperature of the heat-sink copper piece is installed approaching the constantan piece inside the heat-sink copper hole. Therefore, a problem that condensed-phase particle washing or density measurement of disposition heat flux inside a solid rocket engine can not be realized on the high-temperature, high-pressure, and high-heat-flux conditions can be solved.

The invention discloses a 99BeO ceramic metallizing slurry and a preparation method thereof, belonging to the technical field of electronic material. The 99BeO ceramic metallizing slurry consists of 60-70% of metallizing raw material by mass and 30%-40% of organic adhesive. The metallizing raw material consists of 70-90% of metal W by mass and 10-30% of multi-element metal oxide active agent by mass. The multi-element metal oxide active agent consists of MgO, Al2O3, SiO2 and more than one oxides containing Sm, Nd, Pr or Tb. The preparation method comprises the steps: at first, preparing the multi-element metal oxide active agent with raw materials like MgO, Al2O3, SiO2, etc. by ball milling; then mixing the multi-element metal oxide active agent with metal tungsten powder, followed by ball milling and drying so as to obtain the metallizing raw material; and finally mixing the metallizing raw material with the organic adhesive, followed by vibration milling so as to obtain the metallizing slurry. When the metallizing slurry provided by the method is used to metallize the surface of 99 beryllium oxide ceramic, the sintering temperature of metallization can be lowered, and the metallized layer on the surface of beryllium oxide ceramic devices has higher tensile strength and thermal conductivity; and simultaneously, the preparation method thereof is simple in process, low in cost, excellent in repeatability and suitable for industrial production.

What is proposed is a heat-transfer interface device for use in a range of up 320° C. working temperatures for transfer of heat from a source of heat to a heat-receiving object under severe conditions. The device comprises an elastomeric material filled with an electrically-nonconductive and thermally-conductive filler material. The elastomeric material may have recesses on the surface or the surface may be curved, e.g., on the side facing the source of heat for forming a space between the surface of the device and the mating surface of the source of heat. The elastomeric material is clamped between the heat source and heat receiver in a compressed state so that when it is expanded under the effect of an increased temperature, the material is redistributed and the recesses are flattened. The elastomeric material comprises perfluoroelastomer polymer, and the filler can be selected from boron nitride, aluminum nitride, beryllium oxide, etc. If necessary, a combined mixing-assisting and compression-set reducing agent in the form of perfluoropolyether can be added.