58results about How to "Improve high temperature characteristics" patented technology

The invention discloses a plastic-encapsulated power diode and a manufacturing process thereof, and relates to the technical field of semiconductor discrete devices. Its manufacturing process does not adopt the cleaning and dehydration process of organic solvents such as isopropanol and absolute ethanol in the prior art, and the water washing and dehydration process after cleaning with organic solvents is omitted; the chip connected with the wire is put into a heated oven Baking in medium temperature for 4-10 hours, the oven temperature is 200-250°C, and the hydrogen-nitrogen mixed gas or clean air is passed through the oven; put the chip coated with liquid epoxy resin or liquid silicone rubber into the oven at 150±10°C to cure the glue for 10 -60 minutes. Compared with the prior art, the product of the invention has excellent high-temperature characteristics, consistency and reliability.

The invention belongs to the technical field of a gelling agent for geologic hazard control as well as filling control of goaf and waste laneway or collapse craters after exploitation of other mines, and provides a formula and a method of a novel polymer composite gelling agent for grouting. The gelling agent comprises the following components in percentage by weight: 10-25% of bentonite, 5-20% of cellulose, 5-20% of vegetable gum, 10-15% of calcium hydroxide, 10-25% of inorganic hygroscopic agent, 0.5-1.5% of inorganic dispersant, 0.5-2% of inorganic flocculent, 6-18% of organic flocculent, and 5-15% of alkali metal carbonate. The gelling agent is used for processing and crushing, mixing with water, and injecting to slurry for gelling. According to the invention, the characteristics of high-hydroscopicity mineral matters and hydroscopic synthetic resin are sufficiently absorbed and utilized, and various ion groups are introduced and adjusted to obtain specific performance, so that the gelling agent has strong water solubility, can form hydrophile and water-insoluble gel in the slurry, and has excellent adhesion force to solids and dissolved matters in the slurry, good gelling property, strong water control function, high and adjustable jelling speed, low cost and no pollution.

The invention aims to provide a low-activation martensitic heat-resistant steel with oxidation resistance and liquid lead-bismuth corrosion resistance. The heat-resistant steel comprises the following alloy elements in percentage by mass: C not less than 0.09% and not more than 0.12%, Cr not less than 8.8% and not more than 9.2%, W not less than 1.48% and not more than 1.54%, V not less than 0.17% and not more than 0.23%, Ta not less than 0.12% and not more than 0.16%, Mn not less than 0.48% and not more than 0.50%, Si not less than 0.40% and not more than 0.80%, N less than 0.010%, Al less than 0.010%, Ni less than 0.005%, Mo less than 0.005%, Nb less than 0.010%, Co less than 0.005%, Ti less than 0.010%, Cu less than 0.010%, O less than 0.005%, P less than 0.005%, S less than 0.005%, and a matrix being Fe. The heat-resistant steel has excellent mechanical performance, high-temperature characteristic, oxidation resistance and liquid metal corrosion resistance.

The invention discloses a preparation method of a high-nickel positive electrode material, which comprises the following steps: uniformly mixing up a Ni-containing hydroxide, a lithium-containing compound and a doping element, and calcining to obtain a base material A after the mixing operation; adding the base material A into a washing solution, controlling the temperature of the washing solution, washing away residual lithium carbonate and lithium hydroxide on the surface, adding a lithium-containing compound into the washing solution, and drying the washed base material to obtain a mixtureB; uniformly mixing the mixture B, a coating element and a lithium-containing compound, calcining, and crushing to obtain the finally modified high-nickel positive electrode material. The high-temperature stability of the nickel material is improved through doping. The residual lithium carbonate and lithium hydroxide on the surface are reduced through washing. The water absorption and processing performance of the material is improved. The damage to the surface of the material during washing can be repaired through coating. The direct contact between the positive electrode material and the electrolyte can be reduced, so that the high-temperature characteristic and long-cycle performance of the battery cell are improved.

The invention provides a cathode material for a lithium ion secondary battery, which is represented by a general formula of x (AlyZn1-yO)/(1-x)LiMn2O4. LiMn2O4 is coated with an AlyZn1-yO thin film, wherein x is more than or equal to 0 and less than or equal to 0.5; and y is more than or equal to 0 and less than or equal to 0.2. The invention further provides a preparation method of the cathode material, a lithium ion secondary battery anode adopting the cathode material and a lithium ion secondary battery adopting the cathode material. The cheap and environmental-friendly Al-doped ZnO thin film is adopted to carry out surface decoration on a LiMn2O4 material. On one hand, the large-current discharge characteristic of the material is improved by improving electronic conductivity; and on the other hand, the existence of the thin film can also prevent decomposition of an electrolyte on the surface of an active material so as to improve the high temperature characteristic of the electrolyte.

The invention discloses a 6H-SiC substrate reversed polarity AlGaInP LED chip and a manufacturing process thereof. The reversed polarity AlGaInP LED chip comprises a substrate and an epitaxial layer on the substrate, wherein a 6H-SiC material is used as the substrate; and the epitaxial layer sequentially comprises an N-type AlGaInP layer, a light emitting layer, a P-type AlGaInP layer, a P-type GaP layer and a metal reflecting and bonding layer from top to bottom; the N-type AlGaInP layer is provided with an N-type electrode; and the bottom surface of the 6H-SiC substrate or the metal reflecting and bonding layer is provided with a P-type electrode. The manufacturing process comprises the steps that the surface of the 6H-SiC substrate is provided with the metal reflecting and bonding layer in a vapor deposition mode; the epitaxial layer and the substrate are bonded together; then a selective corrosion method is used for corroding and peeling off an original CaAs underlay; and the electrode formed by the processes of vapor deposition, corrosion, and the like is manufactured into a pipe core. The 6H-SiC substrate reversed polarity AlGaInP LED chip uses the 6H-SiC substrate material with high heat conductivity as the substrate and transfers an LED light emitting layer onto the 6H-SiC substrate so as to improve the high-temperature characteristics of products and improve the reliability of the products.

The invention provides a method for manufacturing a high-temperature-resistant high-reliability electrolytic capacitor. The method includes the steps that an anode core block is manufactured in a pressed mode and sintered, a dielectric oxide film is manufactured on the surface of the anode core block, an electrolyte is prepared, a gel electrolyte is prepared, capacitor assembly is performed, and the electrical performance of the capacitor is tested under a high-temperature environmental condition. A low-temperature step change potentiostatic method dielectric oxide film forming process technology is adopted, a heat treatment crystalline phase adjustment process is further added under a vacuum or inert gas or hydrogen environment, high-boiling-point organic modified solvents and depolarizers are added in the working electrolyte of the capacitor so that the high-temperature characteristic of the capacitor can be improved, and the capacitor can still have excellent electrical performance even when capacitor elements are exposed in a high temperature (higher than 200 DEG C) environment.

High power 808nm semiconductor laser is widely applied to pumping Nd:YAG solid laser, laser processing, laser medical treatment and other fields, due to the fact that the semi-conductor laser has the advantages of high efficiency, compact structure, convenient modulation and the like. Meanwhile, people always concern the problems of the semi-conductor laser on efficiency, temperature property and the like. The invention provides design and extension growth of a 808nm laser material by adopting (In)GaAs/GaAs straining isolated layer. Adopting insertion of strained quantum barrier into a wave guide layer and an active layer as a method for improving the physical distance between a quantum well and a growth interface of an initial barrier layer and the electron reflecting layer, and reducing accumulation of heterojunction interface oxygen of an active region and a wave guide region; multiple effective methods and special wave guide structure designs are utilized in the extension growth to improve conduction band edge potential energy, enhance capability of preventing current carrier leakage, restrict current density of threshold, and improve temperature property and quantum efficiency of the laser.

This invention relates to a hydrogen absorbing electrode, in which a rare earth element having a basicity weaker than that of La is mixed to a hydrogen absorbing alloy or contained in it for serving as a component element. The invention relates to a nickel electrode, in which a rare earth element is mixed to a nickel hydroxide or contained in it as a solid solution. The invention further relates to an alkaline storage battery, in which a rare earth element is coated on a surface of a nickel electrode or a surface of a separator.

The purpose of the present invention is to provide a heat-resisting steel for exhaust valves, which contains a relatively small amount of Ni and has excellent mechanical characteristics (such as tensile strength, fatigue strength, wear resistance and hardness) at high temperatures and excellent corrosion resistance. The present invention provides a heat-resisting steel for exhaust valves, which contains 0.45 mass% or more but less than 0.60 mass% of C, 0.30-0.50 mass% (exclusive) of N, 19.0 mass% or more but less than 23.0 mass% of Cr, 5.0 mass% or more but less than 9.0 mass% of Ni, 8.5 mass% or more but less than 10.0 mass% of Mn, 2.5 mass% or more but less than 4.0 mass% of Mo, 0.01 mass% or more but less than 0.50 mass% of Si and 0.01 mass% or more but less than 0.30 mass% of Nb, with the balance made up of Fe and unavoidable impurities. This heat-resisting steel for exhaust valves satisfies 0.02 <= Nb/C < 0.70 and 4.5 <= Mo/C < 8.9.

The invention provides a semiconductor device capable of improving the voltage endurance capability and the high temperature endurance of a common insulated gate bipolar transistor and avoiding the current rebounding phenomenon. According to the semiconductor device, a P type substrate is provided with a buried oxide layer, the buried oxide layer is provided with a drift region, a P type body region is arranged on one side of the drift region, and an N type buffer layer is arranged on the other side of the drift region. A P type emitter region and an N type emitter region connected with the P type emitter region are arranged in the P type body region, and the P type body region is provided with metal used for being connected with the P type emitter region and the N type emitter region and an emitter metal field plate. A P type collector region is arranged in the N type buffer layer, and the N type buffer layer is provided with metal used for connection and a collector metal field plate. A polysilicon gate is arranged above the portion, between the buried oxide layer and the N type emitter region, of the P type body region. Two trench isolation layers are arranged outside an N type body region, a gap for a carrier to flow is reserved between the two trench isolation layers, and two N type collector regions are arranged outside the trench isolation layers and connected with the P type collector region through the metal.

The invention discloses a neodymium iron boron permanent magnet and a preparation method and application thereof. The grain boundary phase and the main phase of the neodymium iron boron permanent magnet have the following structure distribution: the total length of the grain boundary phase in the measurement range is recorded as Lm, the total length of the grain boundary phase with the grain boundary width of more than or equal to 1 [mu] m in the measurement range is recorded as Ln, and Lm and Ln satisfy the relationship of 0.40 < = Ln/Lm < = 1; in the measurement range, the total length of grain boundary phases with the width between adjacent grain boundaries being larger than or equal to 2 microns is recorded as Lx and Lm, and Lx meets the relation that Lx/Lm is larger than or equal to 0and smaller than or equal to 0.2; the total length of the grain boundary phase scanned by the EPMA line in the measurement range is recorded as Le, the total length of the grain boundary phase scanned by the EPMA line in the measurement range is recorded as LM, and Le and LM meet the relationship of 0.40 < = Le/LM < 1. The high-temperature demagnetization-resistant magnet with high Br, high Hcj,high square degree, specific grain boundary phase and main phase structure is prepared.

The invention discloses a ferrite-carbon nanotube composite wave absorption material and a preparation method thereof. The ferrite-carbon nanotube composite wave absorption material comprises a carbonnanotube and a ferrite layer, wherein the ferrite layer comprises 5-17% of macromolecule binding agent, 80-92% of ferrite and additive smaller than or equal to 3% by calculation according to percentby weight, and the carbon nanotube layer comprises 8-20% of macromolecule binding agent, 75-87% of carbon nanotube and an additive smaller than or equal to 5%. By combining a high-absorption magnetic-loss ferrite wave absorption material and light-weight dielectric loss-type carbon nanotube wave absorption material, the high-temperature property, the density, the stability, the processing performance and the application performance of the ferrite are improved; and by changing relative content of each constituent of the composite material, a formula and a preparation process, the electromagnetic parameter of the composite material is controlled, the wave absorption frequency band of a compound is expanded, and the absorption efficiency of the compound is improved.

The invention discloses a DFB laser for improving the high-temperature characteristics of a laser, and the epitaxial structure of the DFB laser comprises an InP substrate which is sequentially provided with a buffer layer, a grating layer, a lower limiting layer, a lower waveguide layer, a quantum well, an upper waveguide layer, an electron blocking layer, a corrosion blocking layer, a ridge waveguide layer, a potential barrier gradient layer and an ohmic contact layer from the bottom to the top; the electron blocking layer is a superlattice formed by AlAs0.56Sb0.44 with ternary components andAlxGa(1-x)AsySb(1-y) materials with quaternary components. According to the epitaxial structure of the DFB laser, a wide-bandgap superlattice electron blocking layer is designed through energy band engineering to limit carriers, on one hand, the probability that the carriers overflow out of a quantum well active region at high temperature is reduced through a high potential barrier, on the otherhand, the valence band potential barrier is reduced through superlattices, hole injection into the active region is facilitated, the high-temperature characteristic of the laser can be effectively improved, and the DFB laser can work normally within the temperature range of -40 DEG C to 115 DEG C.

The invention relates to a non-aqueous electrolyte considering high-temperature characteristics and normal-temperature circulation, an application thereof and a lithium ion battery. Based on the totalweight, the non-aqueous electrolyte comprises the following components in percentage by mass: 70-90% of a non-aqueous organic solvent, 5-20% of electrolyte lithium salt and an additive, based on thetotal weight of the non-aqueous electrolyte, the additive comprises 0.1-2.5% of lithium difluorophosphate, 0.1-2.5% of propane sultone, 0.5-3% of lithium bis (fluorosulfonyl) imide, 0.1-1% of tetravinyl silane and 0.1-1.5% of lithium difluorobis (oxalato) phosphate. The non-aqueous electrolyte disclosed by the invention is good in stability under high voltage, relatively good in circularity, relatively small in gas production rate in the aspect of high-temperature storage and relatively small in DCR growth, and can improve the electrochemical characteristics of the lithium ion battery under high temperature and high pressure.

This invention relates to a hydrogen absorbing electrode, in which a rare earth element having a basicity weaker than that of La is mixed to a hydrogen absorbing alloy or contained in it for serving as a component element. The invention relates to a nickel electrode, in which a rare earth element is mixed to a nickel hydroxide or contained in it as a solid solution. The invention further relates to an alkaline storage battery, in which a rare earth element is coated on a surface of a nickel electrode or a surface of a separator.

The invention discloses a super junction structure, and the structure is formed above the surface of a first N-type epitaxial layer, wherein the width of a P-type column at the top position of a super junction unit is less than that of an N-type column and is unchanged in a step mode; the N-type column is composed of a second N-type epitaxial layer filling grooves, the P-type column is composed of a first P-type epitaxial layer between the grooves, and the first P-type epitaxial layer is formed on the first N-type epitaxial layer; the grooves penetrate through the first P-type epitaxial layer, and the bottoms of the grooves are in contact with the first N-type epitaxial layer; the total amount of P-type impurities of the P-type column in the super junction unit is matched with the total amount of N-type impurities of the N-type column, the second N-type epitaxial layer is formed by overlapping at least two N-type epitaxial sub-layers, and the doping concentration of the first N-type epitaxial sub-layer is higher than that of the P-type column. The invention further discloses a manufacturing method of the super junction device. According to the invention, the process control difficulty can be reduced, the charge balance of the super junction unit can be improved, the reverse recovery current of the body diode is reduced, and the high-temperature characteristic of the device is improved.

The invention relates to an AlGaN-based double-channel Schottky diode based on a groove anode structure and a preparation method. The diode comprises a substrate, a buffer layer, a channel layer, a first barrier layer, a superlattice layer, a second barrier layer and a GaN cap layer, an anode and a cathode; the substrate, the buffer layer, the channel layer, the first barrier layer, the superlattice layer, the second barrier layer and the GaN cap layer are sequentially stacked from bottom to top; a first conductive channel is formed between the channel layer and the first barrier layer; a second conductive channel is formed between the superlattice layer and the second barrier layer; the anode is arranged on the GaN cap layer; the bottom of the anode sequentially penetrates through the GaN cap layer and the second barrier layer; the anode is located in the superlattice layer; the anode and the superlattice layer form Schottky contact; the cathode is arranged on the GaN cap layer and surrounds the periphery of the anode; a distance exists between the cathode and the anode; and the cathode and the GaN cap layer form ohmic contact. According to the AlGaN-based double-channel Schottky diode based on the groove anode structure, the conductive channels are adopted, so that the electron concentration is improved, and the on-resistance is reduced.

The invention provides a preparation method of a green electromagnetic shielding building material, which comprises the following operation steps: selecting a proper amount of carbon nanotubes, and cutting the carbon nanotubes by a chemical longitudinal cutting method. Nano Fe3O4 particles and graphene oxide nanobelts are compounded to prepare a ferroferric oxide-graphene oxide nanobelt compositematerial, the ferroferric oxide-graphene oxide nanobelt composite material is reduced to obtain a Fe3O4-graphene nanobelt composite material; and the ferroferric oxide-graphene nanobelt composite material with different Fe3O4 loading capacities is prepared by adjusting the Fe3O4 loading capacity. The wave-absorbing performance of the material with the continuous thickness of 0.5 mm and 5 mm is calculated, the wave-absorbing performance of the material with the ratio of F to G being 1: 1 and the wave-absorbing performance of the material with the ratio of 2: 1 are the best, and the optimal loading capacity and the optimal thickness of Fe3O4 can be determined. The green electromagnetic shielding building material has the characteristics of light weight and wide wave absorption, and is convenient for industrial large-scale production. The material can be used in a multimedia indoor venue with a large number of electronic devices, not only can protect the health of visitors, but also can improve the visiting experience.