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158results about How to "Guaranteed low temperature stability" patented technology
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Nanofiltration membrane with nanometer hybridized desalination layer
The invention discloses a nanofiltration membrane with a nanometer hybridized desalination layer. The desalination layer formed through interphase hybridization of an inorganic nanoparticle with a particle size of 1 to 1000 nm and polyamide or polyimide is arranged on a porous supporting layer of the membrane. A preparation method for the nanofiltration membrane mainly comprises the following steps: pre-dispersion of the nanoparticle, preparation of a solution A, preparation of a solution B, interfacial polymerization, surface polishing and roller squeezing, rinsing with deionized water, moisture retention with glycerin and drying, wherein air drying and sulfonation can be carried out after surface polishing and roller squeezing. According to the invention, nanometer hybridization effects of a high polymer nano-material in the nanofiltration membrane are made full use of, so hydrophilic performance, antioxidation performance and anti-pollution performance of the nanofiltration membrane are improved, and the nanofiltration membrane has the advantages of low pollution, great flux and a high removal rate. The preparation method is scientific and reasonable, enables the nanometer composite nanofiltration membrane with a specific nanoparticle and polyamide hybridized desalination layer to be prepared and has higher ion selectivity, low pollution capability and temperature stability.
Owner:VONTRON TECH CO LTD
Low sulfur tall oil fatty acid
InactiveUS20070049727A1Low costReduce sulfur contentFatty oils/acids recovery from wasteLiquid carbonaceous fuelsTall oilSulfur content
The invention relates to tall oil fatty acid compositions having low sulfur content, as well as methods of using and making the same.
Owner:ARIZONA CHEM CO
Glassceramic in applying to semiconductor illumination, and preparation method
InactiveCN101092282ALow resistance to UV radiationGuaranteed low temperature stabilityThermal stabilityThermal treatment
This invention discloses a glass ceramic for semiconductor illumination. The glass ceramic is composed of: SiO2 45-60 mol%, Al2O3 0-25 mol%, Na2O 0-10 mol%, NaF 0-10 mol%, ZnF2 0-20 mol%, MF2 0-40 mol%, CeF3 0.5-30 mol%, and RF3 0.1-20 mol%, wherein, M is one or more of Mg2+, Ca2+, Sr2+ and Ba2+, and R is one or more of Dy3+, Eu3+, Tb3+, Sm3+ and Pr3+. The glass ceramic is prepared by high temperature melting and thermal treatment. The preparation method has such advantages as simple process, no pollution and low cost. The glass ceramic has such advantages as broad excitation wavelength, high light brightness, high UV radiation resistance, high chemical stability and high thermal stability, and can be used to fabricate novel LED illuminator together with UV, violet or blue LED.
Owner:ZHEJIANG UNIV
Hybrid lumped distribution miniature band-pass filter
InactiveCN102509824ACompact structureSimple structureMultiple-port networksWaveguide type devicesCapacitanceOut of band rejection
The invention relates to a hybrid lumped distribution miniature band-pass filter. The hybrid lumped distribution miniature band-pass filter comprises a 50-ohmage input-output port installed on the surface, four parallel-connection resonance units, two interstage coupling inductors, a interstage coupling capacitor, a Z-shaped cross coupling capacitor and an input / output inductor which are all achieved through the multilayer low-temperature co-fired ceramic technical skill. The hybrid lumped distribution miniature band-pass filter has the advantages of being good in band-pass selectivity and out of band rejection, low in insertion loss, light in weight, small in volume, high in reliability, good in electric performance, phase-frequency characteristic linearity, temperature stability and electric performance batch uniformity, low in cost, capable of being produced massively and the like, and is especially applicable to radars, communication, rocket carrying, plane carrying, missile carrying, spacecrafts, man-portable mobile communication terminals and other wireless communication handheld and portable terminal products and corresponding frequency range systems with strict requirements for volume, weight, electric performance, reliability and the like.
Owner:WUXI NANLIGONG TECH DEV
Multi-layer magnet arrangement in a permanent magnet machine for a motorized vehicle
InactiveUS20080303368A1Enhanced magnetic forceGuaranteed low temperature stabilityMagnetic circuit characterised by magnetic materialsDC commutatorMotorized vehicleHollow core
A permanent magnet machine includes a stator having a hollow core, a rotor rotatably disposed inside the hollow core, and a plurality of multilayered permanent magnets embedded in the rotor. Each multilayered permanent magnet has opposite first and second ends, and includes a first magnet disposed at the first end, and a second magnet disposed at the second end and coupled to the first magnet. The second magnet has higher magnet strength than the first magnet, and also has lower high-temperature stability than the first magnet.
Owner:GM GLOBAL TECH OPERATIONS LLC
Biodegradable quasi dry cutting oil and preparation method thereof
InactiveCN102002419AGood lubricityGood extreme pressure and anti-wear propertiesLubricant compositionChemistryPolyester
The invention relates to the technical field of chemistry, in particular to biodegradable quasi dry cutting oil and a preparation method thereof. The biodegradable quasi dry cutting oil is characterized in that the cutting oil is prepared from the following raw materials in percentage by weight: 30 to 40 percent of diester, 30 to 40 percent of polyol ester, 20 to 30 percent of poly alpha-olefin PAO20, 5 to 6 percent of zinc dialkyl dithiophosphate (ZDDP), 2 to 3 percent of polyester and 1 to 2 percent of N-laurel acyl alanine. Compared with the prior art, the cutting oil has good lubricating property and extreme pressure abrasion resistance, is biodegradable, and reduces the environmental pollution to minimum.
Owner:上海通快实业有限公司
Method for preparing porous adsorption material by using microwave low-temperature pore-forming activated granular red mud
InactiveCN102908983AGood water resistanceWon't breakOther chemical processesAlkali metal oxides/hydroxidesPorosityMicrowave
The invention provides a method for preparing a porous adsorption material by using microwave low-temperature pore-forming activated granular red mud. The method comprises the following steps: taking a bonding agent which is 2-10 percent of mass of the red mud, uniformly mixing red mud wastes and the bonding agent, kneading into grains by using a granulator or by a hand and activating the red mud grains for 5-30 minutes at an activation temperature of 80-500 DEG C by utilizing microwaves to obtain the porous adsorption material. The red mud is activated by utilizing the selective heating and resonant sintering effects of the microwaves on iron and other matters in the red mud. The porous adsorption material prepared by the method has a pore volume of more than 0.0826 ml / g and a specific surface area of 18.62-24.25 m2 / g, and the grain size can be different as required. The produced porous adsorption material has the characteristics of fine grain, high porosity, large surface area, strong hydroscopicity, good temperature-resistant stability and low cost and has the great advantage in aspect of wastewater adsorption and treatment.
Owner:KUNMING UNIV OF SCI & TECH
Prepn and application of Li and Ti doped nickel oxide-base ceramic
The Li and Ti doped NiO-base ceramic is prepared through a sol-gel process of preparing Li doped NiO precursor powder and subsequent mixing with TiO2 and sintering. The precursor powder prepared through sol-gel process has msll grain size and homogeneous chemical performance, and is easy to sintered and favorable to raising material performance. Regulating the doped Li and Ti amount can alter thedielectric performance of the ceramic material for different requirement. The ceramic has very high dielectric constant, greater than 10 to the power 4 at 1-10 MHz, and high temperature stability andmay be used in thermoelectric electricity generation, thermoelectric refrigeration, producing high-density capacitor and other fields.
Owner:TSINGHUA UNIV
Multi-layer magnet arrangement in a permanent magnet machine for a motorized vehicle
InactiveUS7847461B2Enhanced magnetic forceGuaranteed low temperature stabilityMagnetic circuit characterised by magnetic materialsDC commutatorEngineeringMotorized vehicle
A permanent magnet machine includes a stator having a hollow core, a rotor rotatably disposed inside the hollow core, and a plurality of multilayered permanent magnets embedded in the rotor. Each multilayered permanent magnet has opposite first and second ends, and includes a first magnet disposed at the first end, and a second magnet disposed at the second end and coupled to the first magnet. The second magnet has higher magnet strength than the first magnet, and also has lower high-temperature stability than the first magnet.
Owner:GM GLOBAL TECH OPERATIONS LLC
Nuclear shell type long-acting antibacterial emulsion and preparation method thereof
ActiveCN104592459ANot easy to scrub and dissolveLow film forming temperatureAntifouling/underwater paintsPaints with biocidesEmulsionChemistry
The invention relates to a nuclear shell type long-acting antibacterial emulsion. The nuclear shell type long-acting antibacterial emulsion comprises the following raw material components: water, n-butyl acrylate, isobutyl acrylate, isooctyl acrylate, styrene, methyl methacrylate, vinyl acetate, guanidinium oligomer macromonomers, an emulsifying agent, an initiating agent, a cross-linking agent and sodium bicarbonate. The preparation method comprises the following steps: preparing each raw material component; adding water, the emulsifying agent and isooctyl acrylate into a reactor, stirring, heating to 60-70 DEG C, adding the initiating agent to initiate reaction, and after the emulsion becomes blue, maintaining for 60-120 minutes, so as to obtain a nuclear layer emulsion; maintaining the temperature at 70-80 DEG C, adding n-butyl acrylate, heating to 81-85 DEG C, maintaining the temperature, cooling, and discharging, so as to obtain the nuclear shell type long-acting antibacterial emulsion. According to the preparation method, guanidinium and guazatine oligomers are taken as antibacterial functional groups, and guanidyl serves as a main antimicrobial group, has an obvious antibacterial effect and is very safe to human bodies. The preparation method for the nuclear shell type long-acting antibacterial emulsion is simple, rapid, environmentally friendly and suitable for industrial production, and the operation is easy.
Owner:GUANGXI UNIV
Low-temperature stable transparent soap base bath composition
ActiveCN106619182ALess irritatingGood low temperature stabilityCosmetic preparationsToilet preparationsHigh concentrationIrritation
The invention belongs to the field of daily cosmetics, relates to soap base shower cream and particularly relates to low-temperature stable transparent soap base bath composition. The bath composition contains higher-concentration fatty acid and varieties of surface active agents; on the premise of keeping high fatty acid, the transparent soap base bath composition is in a transparent state at 5 DEG C, can still keep transparent appearance after room temperature restores from -5+ / -2 DEG C and avoids white tallate precipitation; the bath composition has the characteristics of being stable, small in irritation, strong in cleaning force and transparent.
Owner:GUANGZHOU KENENG COSMETICS RES CO LTD +1
System for High Efficiency Solid-State Light Emissions and Method of Manufacture
InactiveUS20100032699A1Reduce intensityImprove high temperature stabilityLamination ancillary operationsLayered product treatmentProduct gasLight emission
In one embodiment of the invention, a bonding material is used to bond a substitute substrate to the LED, wherein the bonding material does not including gold or tin. The bonding material preferably includes gallium (Ga), such as a combination of Ga and Al or Cu. This bonding material has high thermal conductivity, high strength, high temperature stability and is low cost. In another embodiment of the invention, the substitute substrate is first thinned before it is bonded to the LED structure, so that the substitute substrate is flexible and conforms to the shape of the LED structure. In yet another embodiment of the invention, an apparatus is used for bonding a substitute substrate to a LED which comprises a plurality of semiconductor epitaxial layers, said semiconductor epitaxial layers having been grown on the growth substrate so that said semiconductor epitaxial layers are curved in shape. The apparatus comprises a conduit for evacuating a region near the substitute substrate on a side of the substitute substrate that is opposite to that of said semiconductor epitaxial layers. Gas pressure is applied on the semiconductor epitaxial layers, and the substitute substrate conforms to the shape of said semiconductor epitaxial layers as a result of pressure applied. A bonding material is used for bonding said substitute substrate to the semiconductor epitaxial layers.
Owner:DICON FIBEROPTICS
Bismuth ferrite-barium titanate based high-temperature lead-free piezoelectric ceramic with low dielectric loss and high-temperature stability and preparation method thereof
ActiveCN110272270ALow dielectric lossGuaranteed low temperature stabilityPiezoelectric/electrostrictive device manufacture/assemblyDivalent metalDielectric loss
The invention discloses bismuth ferrite-barium titanate based high-temperature lead-free piezoelectric ceramic with low dielectric loss and high-temperature stability and a preparation method thereof. The bismuth ferrite-barium titanate based high-temperature lead-free piezoelectric ceramic has a formulation composition with a general formula of (Bi<1-w>Mw)(Fe<1-t>Me'''t)O<3-x>BaTiO<3+y>Bi(Me'0.5Me''0.5)O<3+z>Bi(Zn0.5Ti0.5)O<3+u>NdCoO<3+m>P<+n>MnCO3, where x, y, z, u, m, n, t and w represent mol fractions; x is more than 0 and no more than 0.4; y is no less than 0 and no more than 0.1; z is more than 0 and less than 0.05; u is no less than 0 and no more than 0.1; m is more than 0 and no more than 0.1; n is more than 0 and no more than 0.1; w is no less than 0 and no more than 0.1; and t is no less than 0 and no more than 0.1. In the general formula, M and Me''' are trivalent metal elements; Me'' and M' respectively are a divalent metal element and a pentavalent metal element; and P is a sintering auxiliary agent. The piezoelectric ceramic provided by the invention has low dielectric loss and high-temperature stability and can be applied to the field of high temperature.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Luminous glass ceramic used for LED white-light illumination and preparation method thereof
InactiveCN101723593AHigh luminous intensityGood Luminescent Matrix ConditionsSpectral modifiersWhite lightSemiconductor
The invention discloses glass ceramic used for semiconductor illumination, which comprises the following components in percentage by mol: 45 to 60 percent of SiO2, 0 to 20 percent of Al2O3, 0 to 15 percent of Na2O, 0 to 20 percent of ZnF2, 12 to 20 percent of CeF3, 1 to 3 percent of DyF3 and 1 to 3 percent of EuF3. The glass ceramic is prepared by adopting a high-temperature melting and thermal treatment process, and the method is simple, pollution-free and low in cost. The glass ceramic of the invention has the characteristics of wide exciting wavelength, high luminous brightness, ultraviolet radiation resistance, and good chemical stability and thermal stability. A novel LED illumination device can be made by matching the glass ceramic with an ultraviolet, purple-light or blue-light LED.
Owner:ZHEJIANG UNIV
High performance multilayer ceramic capacitor medium and preparation method thereof
InactiveCN102363579AHigh dielectric constantLow priceFixed capacitor dielectricStacked capacitorsSilver electrodeCeramic capacitor
The invention discloses a multilayer ceramic capacitor medium with a formula of {[(1-x)BaTiO3+xNBT]+y wt% Nb2O5}+z wt% MgO+a wt% Glass+b wt% RE2O3+c wt% MnCO3; wherein x=0.1-0.25, and x is the mole percentage content of [(1-x)BaTiO3+xNBT]; y=2.2-2.8, and y is the mass percentage content of additional Nb2O5 on a basis of [(1-x)BaTiO3+x NBT]; z=1.0-2.0, a=1-7, b=0-0.015, c=0-0.5; and z, a, b, c aremass percentage contents of additional raw materials on a basis of {[(1-x)BaTiO3+xNBT]+y wt% Nb2O5}; NBT=natrium bismuth titanate; RE=La, Nd, or Gd; and Glass is a self-made additive, wherein the formula of Glass is 1-15% SnO2+0-22% PbO+2-26% TiO2+0-42% Bi2O3+5-39% B2O3. The preparation method comprises steps that: (1) the additive and NBT are prepared; (2) a clinker is fired according to the formula of [(1-x)BaTiO3-xNBT]-y wt% Nb2O5; (3) blending, ball-milling, drying, and grinding are carried out according to the formula; (4) the material is granulated, pressed, and shaped; (5) the product is sintered under a temperature of 1100 DEG C-1200 DEG C; and (6) silver electrode are fired, and the product is tested. The invention provides a multilayer ceramic capacitor medium material with an excellent temperature stable form (X9R form). The material is adaptable under a working temperature above 200 DEG C.
Owner:TIANJIN UNIV
Method for monitoring temperature of annealing machine bench
ActiveCN102054655AMonitor temperatureStable temperatureSemiconductor/solid-state device testing/measurementSemiconductor/solid-state device manufacturingCobalt metalMonitoring temperature
The invention relates to a method for monitoring the temperature of an annealing machine bench. The method is characterized by comprising the following steps of: forming a cobalt metal layer and a cobalt metal protective layer on the surface of a wafer; performing an annealing process on the wafer so as to form a cobalt silicide layer; performing an etching process on the wafer, removing the cobalt metal layer which is not reacted to form the cobalt silicide layer, and measuring the resistance value of the cobalt silicide layer; and acquiring a monitoring temperature value according to a corresponding relation database of the resistance value and a temperature value, and monitoring the temperature of the annealing machine bench according to the monitoring temperature value. By the method for monitoring the temperature of the annealing machine bench, the low temperature of the annealing machine bench can be monitored and the stability of a low temperature process of the annealing machine bench can be objectively reflected by using the characteristics that the sensitive temperature of a cobalt silicide sheet resistance to the annealing machine bench is between 500 and 900 DEG C. Theuniformity of sheet resistances can be easily controlled, and the uniformity of temperatures can be easily adjusted by a deposition method for depositing metals.
Owner:CSMC TECH FAB2 CO LTD
Photovoltaic cell
InactiveUS7323635B2Improve integrityImprove stabilityDeferred-action cellsElectrolytic capacitorsCross-linkSemiconductor package
A method of making a photovoltaic cell includes contacting a cross-linking agent with semiconductor particles, and incorporating the semiconductor particles into the photovoltaic cell.
Owner:MASSACHUSETTS LOWELL UNIV OF +1
P wave band third octave miniature directional coupler
The invention relates to a P wave band third octave miniature directional coupler which comprises four surface-mounted 50-ohm input ports and output ports, an asymmetric strip line, a three-dimensional folded and coupled strip line and a ground plate. The structure is achieved by adopting a multi-layer high-frequency and low-loss dielectric stack technology. The P wave band third octave miniature directional coupler has the advantages of wide operating frequency band, small dimension, high reliability, excellent electrical performance, good direct and coupled port broadband phase orthogonality, small direct and coupled port amplitude deviation, good temperature stability, good heat radiation performance, simple structure, high yield, good bulk electrical performance consistency, low cost, convenient installation and use and the like, and can be widely applied to communication, and radar with corresponding frequency bands and wireless systems.
Owner:NANJING UNIV OF SCI & TECH
System for high efficiency solid-state light emissions and method of manufacture
InactiveUS7919780B2Reduce intensityImprove high temperature stabilityLamination ancillary operationsLayered product treatmentLight emissionLead structure
Owner:DICON FIBEROPTICS
2.4-kilomegahertz miniature band-pass filter with low loss and double-zero
InactiveCN101621147ACompact structureReduce lossMultiple-port networksWaveguide type devicesPhysicsMicrowave frequency
The invention discloses a 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero, which comprises a surface-mounted 50-ohm impedance input port, a first-stage parallel resonance unit, a first-stage serial resonance unit, a first inter-stage coupling capacitor, an inter-stage serial coupled inductor, a second inter-stage coupling capacitor, a second-stage parallel resonance unit, a second-stage serial resonance unit, a surface-mounted 50-ohm impedance output port and a ground terminal. The 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero has the advantages of low insertion loss, small volume, light weight, high reliability and the like, and is particularly suitable for Bluetooth transmission, ISM (industry, science and medicine) frequency band transmission, communication of corresponding microwave frequency bands, digital radar and wireless communication handheld terminals, as well as occasions and corresponding systems which are serious to volume, electrical performance, temperature stability and reliability.
Owner:NANJING UNIV OF SCI & TECH
Method for Enhancing High Temperature and Low Temperature Resistance of Aluminum Electrolytic Capacitors
InactiveCN102280257AGuaranteed low temperature stabilityRaise the ratioElectrolytic capacitorsPhosphorous acidPhosphoric acid
The invention discloses a method for enhancing the high temperature resistance and low temperature resistance of an aluminum electrolytic capacitor, which includes the preparation of an electrolyte, and the electrolyte includes the following raw materials in parts by weight: main solvent: 48-80%; auxiliary solvent: 10-32%, solute : 15-30%, additives: 0.3-3.2%, wherein, the solvent composed of the main solvent and the auxiliary solvent is a liquid with low saturated vapor pressure; the solute is tetramethylammonium maleate, ammonium adipate, triethylamine, One or more of 1,2-dimethylimidazolium phosphoric acid and phosphorous acid. Due to the selection of solvents with low saturated vapor pressure, the ratio of solutes is increased to ensure that the electrolyte does not condense at low temperature and the solutes do not precipitate; adding hydrogen absorbing agents and water suppressing agents reduces the internal pressure of the product; adding inhibitors and low leakage agents, The occurrence of high-temperature characteristic defects such as too fast recovery of electric leakage is prevented; the invention can also effectively ensure the low-temperature stability of the electrolyte, and provide guarantee for the stable operation of the LED driving power supply.
Owner:ZHAOQING BERYL ELECTRONICS TECH
Refrigeration lubricant composition
ActiveUS20060278845A1Improve the lubrication effectImprove stabilityLiquid carbonaceous fuelsHeat-exchange elementsCarboxylic acidN-pentanoic acid
The present invention provides a refrigeration lubricant composition that have necessary properties such as compatibility with a hydrofluorocarbon refrigerant, thermal stability, hydrolytic stability and low-temperature fluidity, and good lubricity, and has high stability under low temperature conditions so that crystals are prevented from being precipitated over a long term. The refrigeration lubricant includes an ester obtained from a mixed alcohol and a mixed carboxylic acid, wherein the mixed alcohol consists of 65 to 99.95 mol % of pentaerythritol and 0.05 to 35 mol % of dipentaerythritol, the mixed carboxylic acid consists of n-pentanoic acid, n-heptanoic acid, and isononanoic acid, the molar ratio of the n-pentanoic acid to the n-heptanoic acid is 0.3 or more and 10 or less, and the isononanoic acid is contained in the mixed carboxylic acid at a ratio of 10 mol % or more and 45 mol % or less.
Owner:NOF CORP
Positive electrode active material for lithium secondary battery and lithium secondary battery including the same
PendingUS20200083531A1High reversible capacityGuaranteed low temperature stabilityPositive electrodesLi-accumulatorsElectrolytic agentPhysical chemistry
The present invention relates to a positive electrode active material for a lithium secondary battery and a lithium secondary battery including the same. The positive electrode active material according to the present invention reduces the specific surface area and grain boundary of a secondary particle in which a side reaction with an electrolyte solution occurs to improve the high-temperature stability of the positive electrode active material and reduce gas generation caused by the positive electrode active material.
Owner:ECOPRO BM CO LTD
Sealing gasket covered with carbon-fiber covering yarn and preparation method of sealing gasket
The invention discloses a sealing gasket covered with carbon-fiber covering yarn. The sealing gasket comprises two mixed padding layers, a reinforcing fiber layer and a carbon-fiber covering yarn layer, wherein the reinforcing fiber layer is located between the two mixed padding layers, and the carbon-fiber covering yarn layer is arranged at the outer side of the sealing gasket in a covering manner. The sealing gasket is made of polytetrafluoroethylene, nitrile rubber, graphite, natural rubber, coke powder, vermiculite powder, barite powder, aramid fibers and glass fibers, and therefore the sealing gasket has the beneficial effects of being quite low in friction coefficient, quite good in high temperature stability and heat shock resistance, quite high in strength and heat conductivity coefficient, low in expansion coefficient, quite high in electrical resistivity, resistant to corrosion and capable of allowing microwaves or infrared rays to permeate and the like, the natural rubber is quite high in elasticity, and therefore the sealing gasket is quite good in elasticity and plasticity; the periphery of the sealing gasket is covered with the carbon-fiber covering yarn layer, and therefore the sealing gasket has the beneficial effects of being quite high in acid resistance, alkali resistance, corrosion resistance and abrasion resistance; and in addition, the sealing gasket is subjected to vulcanization treatment, so that the sealing gasket is durable and not prone to aging.
Owner:DONGTAI HUAYANG GLASS FIBER
Refrigeration lubricant composition
ActiveUS7507348B2Maintain good propertiesImprove the level ofLiquid carbonaceous fuelsHeat-exchange elementsAlcoholPentaerythritol
Owner:NOF CORP
Ultra-wideband multi-octave micro directional coupler
The invention relates to an ultra-wideband multi-octave micro directional coupler, which comprises four surface-mounted 50-ohm input ports and output ports, an asymmetric strip-line, a three-dimensional foldable-structural coupled strip-line and a grounding plate; the above structures are realized through a multilayer high-frequency low-loss medium lamination technique. The ultra-wideband multi-octave micro directional coupler has advantages that the working frequency band is wide, the size is small, the reliability is high, the electric performance is excellent, the wideband phase orthogonality of a through port and a coupling port is good, the amplitude deviation of the through port and the coupling port is small, the temperature stability is good, the heat radiation performance is good, the structure is simple, the rate of finished product is high, consistence of electric performance indexes in mass production is good, the cost is low, convenience in installation and application is realized and the like, and the ultra-wideband multi-octave micro directional coupler can be widely applied to the communication, radar and wireless systems of corresponding frequency bands.
Owner:CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
Surface acoustic wave sensor with low loss and high temperature stability
InactiveCN101644611AReduce lossGuaranteed low temperature stabilityAnalysing fluids using sonic/ultrasonic/infrasonic wavesForce measurement using piezo-electric devicesElectricityLithium
The invention provides a surface acoustic wave sensor with low loss and high temperature stability, which comprises a piezoelectric substrate, an input interdigital transducer and an output interdigital transducer which are deposited on the piezoelectric substrate and sensitive membranes covered on the piezoelectric substrate, the input interdigital transducer and the output interdigital transducer. The piezoelectric substrate is made of crystal materials with high electromechanical coupling factor and high temperature stability, and the piezoelectric substrate adopts LGS, LGT, LGN, gallium phosphate, Sr3TaGa3Si2O14, Sr3NbGa3Si2O14, Ca3TaGa3Si2O14, Ca3NbGa3Si2O14, Sr3Ga2Ge4O14 and lithium tetraborate. The input interdigital transducer excites and spreads acoustic waves in the piezoelectricsubstrate, the output interdigital transducer is used for receiving the acoustic waves, when a loaded object to be tested reacts with the sensitive membranes, the features of the acoustic waves are changed, and a conclusion of the features of the object to be tested is obtained by detecting the changes. The surface acoustic wave sensor improves the performances of the sensor on the structural aspect and realizes the practical surface acoustic wave sensor with low loss and high temperature stability.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Aluminum dihydrogen phosphate-silica powder composite high-temperature binder and preparation method thereof
InactiveCN108083665AExtended service lifeSmall coefficient of thermal expansionPhosphateUltimate tensile strength
The invention discloses an aluminum dihydrogen phosphate-silica powder composite high-temperature binder and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing 25-30 parts by weight of rho-Al2O3 powder, 10-15 parts by weight of 0.2-0.6mm tabular corundum, 10-15 parts by weight of 0.5-1.0mm tabular corundum, 20-25 parts by weight of silica powder, 8-13 parts by weight of aluminum dihydrogen phosphate, 8-13 parts by weight of magnesium oxide and 15-20 parts by weight of water in a mixer, thereby obtaining the aluminum dihydrogen phosphate-silicapowder composite high-temperature binder. The aluminum dihydrogen phosphate-silica powder composite high-temperature binder overcomes the problems such as low bonding strength, limited use temperaturerange and high curing temperature of an existing high-temperature binder, and has the characteristics of being low in cost, simple in process, low in curing temperature and good in strength at a hightemperature.
Owner:河南东大高温节能材料有限公司
Small high-low temperature tester
ActiveCN102941131ASmall sizeSimple structureHeating or cooling apparatusEnclosures/chambersThermal insulationHeater Rod
The invention discloses a small high-low temperature tester, which provides a high-low temperature environment for tests. The small high-low temperature tester comprises a high-low temperature test box, a temperature sensor, a single-headed heating rod, an electromagnetic valve, a self-pressurizing liquid nitrogen tank and a high-low temperature controller; the high-low temperature test box adopts the high-low temperature controller as a controller to control the single-headed heating rod and the electromagnetic valve to carry out heating and cooling processes; the high-low temperature test box adopts epoxy boards as thermal insulation layers, and when the difference between the temperatures inside and outside the high-low temperature test box is about 100 DEG C, the outside of the high-low temperature test box cannot be frosted. The size of the high-low temperature test box is small, the structure is simple, the small high-low temperature tester is practical and convenient, the temperature stability is good, the precision is higher, the temperature can be optionally set within a range from 60 DEG C below zero to 60 DEG C, and the small high-low temperature tester can satisfy part of currently known high-low temperature tests needing transmission shaft input.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Polyimide containing carbazole structure, preparation method thereof and application thereof
The invention discloses polyimide containing a carbazole structure, a preparation method thereof and application thereof. According to the polyimide, carbazole structure included aromatic diamines high in planarity and various tetracid dihydride are used as raw materials to prepare polyimide powder materials or film through thermal imidization or chemical imidization. The lowest energy state structure of diamine monomers have high planarity and rigidity, the prepared polyimide molecular chain is stacked tightly and has outstanding blocking performance, high glass-transition temperature and heat stability as well as low thermal expansion coefficient. The polyimide preparation method is simple and diversified in process and applicable to industrial production. The polyimide can be widely applied to the field of high and new technology industries such as microelectronics, war industry, aerospace, high-performance packaging and protection and electronic device packaging.
Owner:HUNAN UNIV OF TECH
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