77results about How to "Good batch consistency" patented technology

The invention provides an inter-board perpendicular interconnection circuit structure for a substrate integrated ridge waveguide (SIRW), and aims to provide a millimeter wave inter-board perpendicular interconnection circuit structure with small volume, easy integration, high interconnection property and long-term reliability. The inter-board perpendicular interconnection circuit structure is implemented by the following technical scheme: the SIRW (3) perpendicular to the surface of a base board is integrated on an LTCC multilayered circuit board (1); a substrate integrated ridge waveguide opening is etched in a corresponding outlet in the metal ground on the surface of the LTCC multilayered circuit board (1); Z-direction metalized filling holes (2) are arranged to form a metal hole gate array to equivalently form the waveguide wall and single-side ridges in the waveguide; metallic shield holes and probe restraining cavities (7) on the two sides of a 50-ohm strip line (8) are arranged at the equal spacing; and the alignment pressing and connection of the SIRW interfaces on the opposite sides between two boards is realized through pin hole alignment, so that the perpendicular interconnection transition of the millimeter wave signal between two boards in a way of 50-ohm strip line-SIRW-SIRW-50-ohm strip line is realized consequently.

The invention discloses an electronic parking executor 1 applied to a motor vehicle brake system, which comprises a shell, a cover, a motor, motor accessories, a planetary gear transmission mechanism, parking brake calipers and the like. The electronic parking executor also comprises an integrated transmission mechanism frame, wherein a transmission mechanism and a planetary gear transmission mechanism from a motor shaft and a planetary gear main shaft are installed on a body in the integrated transmission mechanism frame, and the power transmission route of the transmission mechanism is from the motor shaft to the planetary gear main shaft. The technical scheme provided by the invention can effectively solve the problems of inconsistent assembly between rigid spacers and the motor shaft and the main shaft of the planetary gear transmission mechanism, axial nonparallelism and easy deformation of the rigid spacers after stressing in the prior art; meanwhile, the invention also has the characteristics of increasing the stability of internal transmission mechanism and the performance consistency after being connected with braking, reducing assembly cost, increasing assembly quality, benefiting tests, having good batch consistency and the like.

The invention discloses an industrial production method for preparing nanometer lithium iron phosphate by adopting a solvent thermal method. The industrial production method comprises the following steps that phosphorus source compounds, iron source compounds, lithium source compounds, carbon sources and solvents are proportionally and sequentially added into a sealed reaction kettle and are uniformly mixed and stirred, the stirring temperature rising reaction is carried out in inert atmosphere, primary products of the lithium iron phosphate are obtained, solid and liquid separation is carried out, washing and drying are carried out, the roasting is carried out in the inert atmosphere, and the lithium iron phosphate products are obtained. Waste water and waste organic solvents generated in the production process are recovered and reutilized through reduced pressure distillation. The obtained product of the lithium iron phosphate materials has fine primary particle size and narrow particle size distribution, in addition, the distribution is uniform, the conductivity is good, the electrochemical performance of products is good, the product batch consistency is good, the operation of a recovery method is simple, the control is easy, the energy consumption is low, and the method is suitable for industrial production and application.

The invention discloses a secondary sintering synthesis method for lithium iron phosphate, which comprises the following process steps of: 1, preparing materials in a molar ratio of lithium to iron to phosphorus element of (0.98-1.02): 1: 1, and mixing the materials uniformly; 2, heating the obtained mixture to between 350 and 550 DEG C, preserving the heat for 5 to 15 hours, then cooling the mixture along with a furnace to room temperature, and crushing the obtained material to obtain lithium iron phosphate powder; 3, mixing the obtained lithium iron phosphate powder, a carbon source and a solvent uniformly, drying the mixture and then heating the mixture to between 650 and 850 DEG C, preserving the heat for 10 to 20 hours, then cooling the mixture along with the furnace to room temperature, and crushing, screening and grading the mixture to obtain a screened product which is a lithium iron phosphate product produced by the method. The method is simple; the operation is convenient; the prepared lithium iron phosphate has high electric conductivity, good storage performance, good low-temperature performance and good batch consistency; and the method greatly improves the electric conductivity, low-temperature performance, storage performance and batch stability of the lithium iron phosphate. The method is suitable for industrialized production and can replace the conventional one-time high temperature sintering process.

The invention provides a preparation method for a large-size slice-shaped and ultrahigh-heat-conductivity diamond/copper composite material and relates to the preparation method for the diamond/coppercomposite material. The purpose of the preparation method for the large-size slice-shaped and ultrahigh-heat-conductivity diamond/copper composite material is to solve the problems of the low heat conductivity and the poor interfacial bonding strength of the diamond/copper composite material. The preparation method comprises the steps that diamond particles coated with metal films are filled intoa mold cavity of a graphite mold to obtain a prefabricated body; and the prefabricated body is placed into a crucible, block-shaped pure copper and copper alloy are placed at the upper portion of theprefabricated body inside the crucible to be placed into an air pressure leaching furnace, interfacial layer material tissue form adjusting and control are performed under an argon protective atmosphere, warming copper melting, heat preservation and pressure maintaining leaching are performed, and finally, pressure maintaining stepped cooling is performed. In an obtained composite material component, the diamond volume fraction is 60-85%, the heat conductivity reaches 1500 W/mK, the edge length reaches 60-130 mm, and the thickness reaches 0.2-4 mm. The preparation method for the large-size slice-shaped and ultrahigh-heat-conductivity diamond/copper composite material is suitable for preparing the high-heat-conductivity diamond/copper composite material.

The invention discloses a hard carbon negative electrode material, a lithium ion battery and a preparation method and application of the hard carbon negative electrode material. The preparation method comprises the following steps: (1) carrying out cross-linking reaction on carbon source precursor powder and an additive to prepare a modified carbon source precursor, wherein the additive comprises a cross-linking agent, a modifier and a dispersing aid; (2) sequentially carrying out heat treatment and cooling on the modified carbon source precursor, and mixing the modified carbon source precursor with a lithium-rich agent to prepare a modified hard carbon precursor; and (3) carrying out vacuum carbonization on the modified hard carbon precursor to obtain the hard carbon negative electrode material. The hard carbon negative electrode material prepared by the method belongs to typical amorphous carbon and is high in pyrolysis yield, and the lithium ion battery prepared by taking the hard carbon negative electrode material as the negative electrode material is high in first reversible capacity, high in first coulombic efficiency, stable in property and good in batch consistency.

The embodiment of the invention relates to a printed circuit board and discloses a printed circuit board as well as a manufacture method and associated equipment thereof. The associated equipment comprises a device for solving the reflux of a radio-frequency power amplifier and communication equipment. The printed circuit board comprises a plurality of monolayer printed circuit boards, and the first surface of the printed circuit board is attached with a surface copper sheet; one reference monolayer printed circuit board of the printed circuit board is attached with a reference copper sheet which corresponds to the surface copper sheet and is different from the monolayer printed circuit board attached on the surface copper sheet; the printed circuit board comprises a window, and the side wall of the window is attached to side wall metal; and the side wall metal is electrically connected with the reference copper sheet and insulated with the surface copper sheet. The technical scheme does not need the complicated processing procedure of the printed circuit board when the problem of the reflux is solved.

The invention discloses a manufacture method of a carbon-silicon compound cathode material of a lithium ion battery, belonging to the technical field of cathode materials of a lithium ion battery. The invention is a simple in a synthetic technology and a use device; and compared with the synthetic method of traditional carbon-silicon compound cathode materials such as a chemical vapor deposition method, the manufacture method is lower in the production cost; and by adopting the process method and the technological parameter, amphiphilic carbon material nanoparticles are manufactured through freezing and drying, so that the step of an organic solvent replacement process is saved, and the cost and the environmental pollution and the toxicity to the personal, caused by the organic solvent are reduced.

The invention provides a high-precision over-temperature protection circuit. The high-precision over-temperature protection circuit is characterized by comprising a PTAT reference current generation circuit, an over-temperature comparison voltage generation circuit, a reference voltage generation circuit and an over-temperature comparator, the over-temperature comparison voltage generation circuit and the PTAT reference current generation circuit serve as current mirror images of each other, the output end of the over-temperature comparison voltage generation circuit and the output end of the reference voltage generation circuit are connected with the negative phase input end and the positive phase input end of the over-temperature comparator respectively, and the output end of the over-temperature comparator serves as output of the over-temperature protection circuit. Whether temperature exceeds the over-temperature protection threshold value is judged by comparing the over-temperature comparison voltage and the constant reference voltage, so that when the product temperature is too high, an over-temperature protection signal is output, and a product is controlled to enter the temperature protection state. The circuit is simple in structure, the over-temperature protection trigger point is not influenced by the manufacturing process, and the high-precision over-temperature protection circuit is accurate, high in batch consistency and high in accuracy, can be used as an over-temperature protection module in products such as integrated circuit chips, MCU modules and switch power supplies, and has good market development value.

The embodiment of the invention relates to a device and method for preparing fine particle size metal powder through local melting of particles. The device comprises an atomizing chamber, a powder feeding mechanism, a heat source, a rotating mechanism and a driving mechanism, wherein the powder feeding mechanism is used for feeding first metal powder into the atomizing chamber; the heating part ofthe heat source is arranged in the atomizing chamber and used for melting the first metal powder into second metal powder with the periphery in a liquid state; the rotating part of the rotating mechanism extends into the atomizing chamber and receives the second metal powder falling to the surface of the rotating part; and the driving mechanism is connected with the rotating mechanism, and the driving mechanism drives the rotating part to rotate to generate centrifugal force to crush the second metal powder into a plurality of third metal powder. According to the device and method, the coarseparticle size metal powder can be subjected to secondary crushing to prepare fine particle size metal powder, the quality and yield of the fine particle size metal powder can be increased, and the application range of the metal powder is expanded.

The invention discloses a 5G low-profile high-performance ultra-wideband antenna oscillator and a base station antenna. The 5G low-profile high-performance ultra-wideband antenna oscillator comprisesa bottom plate, a bracket and a substrate which are connected in sequence; a metal layer is arranged on the top surface of the substrate; a cross groove is formed in the center of the metal layer; themetal layer is divided into four radiators by the cross groove; the support is provided with a feed line and a first conductor layer which are coupled with each other, the bottom plate is provided with a second conductor layer, the first conductor layer is respectively conducted with the metal layer and the second conductor layer, the end part of the cross-shaped groove is branched to form two sub-gaps which are respectively communicated with the edge of the metal layer, and a triangular resonance structure is formed between the two sub-gaps. According to the 5G low-profile high-performance ultra-wideband antenna oscillator, the triangular resonance structure is loaded through the unique polygonal radiator structure, the antenna oscillator has the advantages of being low in height, smallin size, light in weight and easy to integrate under the condition that the antenna size is not increased, and meanwhile the antenna frequency band and the antenna radiation performance index are effectively improved.

The invention discloses a stratified anode material of a O3-type sodium-ion battery and a preparation method and application thereof. The anode material is composed of NaNi1/2Co1/6Mn3/8O2. The preparation method of the anode material is a high temperature solid state method and includes the following steps that metallic oxides and a sodium source are mixed according to the stoichiometric ratio, after even mixing, tabletting is conducted, then temperature programming is conducted for a needed temperature, the temperature is maintained for a while, and then cooling is conducted to obtain the anode material, wherein the metallic oxides are NiO, Co2O3 and MnO2. The synthesis method of the stratified anode material of the O3-type sodium-ion battery is simple, and amplification application is easy; the material is stable in property and even in grain size and has excellent cycle performance and potential for being used by the sodium-ion battery for mass energy storage, and the application prospects are good.

The invention belongs to the technical field of bearing materials, and relates to a porous polyimide composite material for a bearing retainer, a preparation method of the porous polyimide composite material and the bearing retainer. The porous polyimide composite material for the bearing retainer is prepared by limiting, pressing and sintering the following raw materials in percentage by mass: 92-97% of monoether anhydride polyimide and 3-8% of polytetrafluoroethylene, wherein the monoether anhydride polyimide is prepared by polycondensation, dehydration and cyclization of 4, 4 '-oxybisphthalic anhydride and 4, 4'-diaminodiphenyl ether. Under the condition that the porosity of the composite material is equivalent to that of an existing material, the strength of the composite material canbe remarkably improved, so that the strength performance of the composite material is compatible with micropore characteristics, long-term use of the retainer after one-time oiling is facilitated, andthe service life of a bearing is prolonged under the condition that the requirements of harsh bearing working conditions are met.

The present invention provides a novel polyanion type positive electrode material preparation process. The technical scheme comprises that an organic matter assisted spray drying method is adopted to prepare the novel polyanion type positive electrode material Li3V2(PO4)3, and the prepared Li3V2(PO4)3 has the specific capacity close to the theoretical capacity, and has good rate cycle stability. The preparation process of the present invention has the following characteristics that: the monoclinic crystal base Li3V2(PO4)3 has the NASICON (sodiumsuperionconductor) structure so as to improve the rate performance of the material; and the 3 Li<+> in Li3V2(PO4)3 can be reversibly inserted and deinserted, the theoretical specific capacity achieves 197 mAh/g, and the Li3V2(PO4)3 has the highest specific capacity in the currently found phosphate lithium ion battery electrode material.

The invention belongs to the technical field of preparation of graphene and in particular relates to a preparation method of graphene. The preparation method of graphene comprises the following steps: firstly mixing oxidants uniformly in a process of preparing graphite oxide, then adding graphite powder, effectively separating the mixing heat from the reaction heat and enabling the temperature of the whole feeding stage to be controllable. Compared with the prior art, the graphene prepared through the method is relatively high in specific surface area and obviously high in batch stability.

The invention relates to an IPD absorption band-pass filter and belongs to the technical field of filters. The sensor comprises a substrate layer and a back gold layer on the lower surface of the substrate layer, wherein a first silicon nitride layer grows on the substrate layer, a thin-film resistance layer is sputtered on the first silicon nitride layer, a first metal layer is formed on the first silicon nitride layer, a second silicon nitride layer grows on the first metal layer, and a polyimide layer grows on the second silicon chloride layer; a second metal layer is formed on the polyimide layer, a third silicon nitride layer grows on the second metal layer, and a filter circuit structure is formed on the first metal layer and the second metal layer; the filter circuit structure comprises a first band-pass signal processing unit, a second band-pass signal processing unit and an LC parallel resonance circuit which are connected in series between an input port and an output port, anIPD-GaAs process is adopted, the absorption type filter circuit structure is manufactured on a GaAs substrate through photoetching, sputtering, electroplating, etching and other procedures, and the effect of high stop band suppression is achieved.

The invention discloses a dual-frequency dual-polarized dipole antenna unit for 5G. The dual-frequency dual-polarized dipole antenna unit comprises an antenna oscillator composed of a dielectric substrate and metal radiators, the dielectric substrate is a PCB, and the metal radiators are symmetrically arranged on the two sides of the dielectric substrate through a copper-clad process and are provided with open grooves. The radio frequency cable is connected with the metal radiators through the microstrip line and feeds the metal radiators, the shapes of the metal radiators and the open grooves can be set according to the performance and structural requirements of the antenna unit, the antenna unit has the advantages of wide bandwidth, high gain, good directional diagram consistency and convergence, and the antenna is compact in structure and small in size, has the dual-frequency dual-polarization characteristic, is good in radiation characteristic, and is especially suitable for a 5G base station with higher requirements for the bandwidth and size of the antenna.

The invention discloses a large-scale preparation method of single-phase NiS2 powder. The preparation method comprises the steps of 1) mixing metal nickel powder and sublimed sulfur powder in proportion; 2) performing high-temperature solid-phase synthesis heat treatment on the mixed powder in a protective gas atmosphere; 3) carrying out grinding, sieving and phase characterization on the synthesized powder, if a phase characterization result shows that sulfur is insufficient, supplementing sublimed sulfur powder for mixing, and carrying out high-temperature solid-phase synthesis again according to the condition in the step (2) until metal nickel is completely synthesized into a NiS2 phase; and 4) performing differential thermal analysis on the NiS2 powder synthesized in the step 3), if the differential thermal analysis shows that the mass percentage content of elemental sulfur is higher than 0.2%, removing redundant elemental sulfur through high-temperature heat treatment until the mass percentage content of elemental sulfur is lower than 0.2%. The process is simple, large-scale production can be achieved, the obtained NiS2 powder is high in purity, high in conductivity and uniform in particle size, and a foundation is laid for obtaining high-power thermal batteries.