17 results about "Phase diffusion" patented technology

The present invention provides a transient liquid phase diffusion bonding preform, and a transient liquid phase diffusion bonding method and a power module using same, the preform having a unidirectional porous metal body applied thereto and thus facilitating high-temperature bonding. The transient liquid diffusion bonding preform to which a unidirectional porous metal body is applied, according to an embodiment of the present invention, comprises: a unidirectional porous metal body having a plurality of unidirectional pores extending in one direction from a first surface to a second surface and made of a high-melting point metal; a first surface layer disposed on the first surface of the unidirectional porous metal body and made of a low-melting point metal; a second surface layer disposed on the second surface of the unidirectional porous metal body and made of the low-melting point metal; and a pore-filling layer for filling at least a portion of the plurality of unidirectional pores of the unidirectional porous metal body and made of the low-melting point metal.

The invention provides a phosphate positive electrode material and application thereof, the phosphate positive electrode material comprises an inner core and a plurality of linear structures connected to the surface of the inner core, and the linear structures are made of lithium manganese iron phosphate. The phosphate positive electrode material can reduce the interface diffusion impedance, improve the ion solid phase diffusion coefficient, increase the energy density of the positive electrode plate and improve the electrochemical performance of the battery.

The application discloses a method for obtaining C / C composite ablation morphology based on physical information neural network, and relates to the field of aerospace, comprising the following steps: taking the coordinate data of a C / C composite three-dimensional space model under a Cartesian coordinate system, an ablation time, a dimensionless parameter Sh and a dimensionless parameter A as inputs of a pre-trained multilayer perceptron network, outputting oxygen molar concentration and solid volume fraction through the pre-trained multilayer perceptron network; solving a gas phase diffusion equation and a solid phase evolution equation through the oxygen molar concentration and the solid volume fraction output by the multilayer perceptron network to obtain the C / C composite ablation morphology. The method can efficiently and accurately solve the gas-solid coupling equation, overcome the limitations of traditional numerical methods, accurately obtain the ablation morphology of the C / C composite under the gas-solid coupling effect at a low calculation cost, and provide strong theoretical support and technical support for the application of the C / C composite in the field of aerospace and the like.

The embodiment of the invention provides a method for acquiring a solid-phase diffusion coefficient of a state of charge of a battery electrode material, and the method comprises the steps: assembling a battery material to form a test battery in preset environment requirements, the preset environment requirements comprising pressure quantification and consistent hard sealing; performing a plurality of charging and discharging cycles on the tested battery, and identifying a flat potential interval; applying repeated small potential steps to the first test battery, recording a current-time curve, and calculating a first solid phase diffusion coefficient; repeated constant current pulses are applied to a second test battery, the second test battery is cut off after a fixed duration, and a voltage-time recovery curve after the second test battery is cut off is recorded to calculate a second solid phase diffusion coefficient; and associating the first solid-phase diffusion coefficient and the second solid-phase diffusion coefficient with the corresponding SOC points, and drawing a solid-phase diffusion coefficient change curve in the flat potential interval.

This invention discloses a sensor based on metal solid-phase diffusion and its processing method. The diaphragm fixing assembly includes a base and a connecting ring disposed on the outer wall of the diaphragm. A base cavity is provided on the lower end face of the base, and a circuit board is assembled within the base cavity. An annular boss is provided between the bottom surface of the base cavity and the top surface of the circuit board. The base is made of a first metal material. The circuit board is made of a second metal material with a surface coating forming a metal film layer. The annular boss is made of either the first or second metal material, wherein the melting point of the second metal is higher than that of the first metal. A metal solid-phase diffusion layer is formed between the annular boss and the bottom surface of the base cavity in contact with it for sealing, or a metal solid-phase diffusion layer is formed between the annular boss and the metal film layer for sealing. The above sensor, by setting the annular boss and forming a metal solid-phase diffusion layer for sealing, improves the reliability of the seal between the circuit board and the base cavity, and enhances the sealing performance of the oil cavity.

The invention discloses a color-adjustable hybrid manganese-based metal halide as well as a preparation method and application thereof, and belongs to the technical field of luminescent materials. The chemical formula of the color-adjustable hybrid manganese-based metal halide is (C30H34P2) MnCl4, on the premise of not changing the chemical composition, a hydrogen bond network and a local structure environment are regulated and controlled by adopting a cooling crystallization method and a three-layer liquid phase diffusion method, so that two kinds of crystals emitting green light (520 nm) and red light (670 nm) are prepared; the technical problems that an existing hybrid manganese-based halide is fixed in light emitting color, and multi-color regulation and control are difficult to achieve under the same component are solved. In addition, the process is simple, repeatability is good, and a new strategy is provided for development of multicolor luminescent materials and optical devices.

The invention relates to a process strengthening method and system based on ultrasonic cavitation targeted enrichment and pressure relief blasting atomization. The method comprises the following steps: A, a pressurized synergistic cavitation and targeted enrichment step; b, millisecond-level pressure release energy control blasting and atomization; and C, interface instantaneous mass transfer and reaction. According to the process strengthening method, the speed control step of the process is revolutionarily converted into interface behavior control from bulk phase diffusion control, and the order of magnitude of efficiency is improved. The system for implementing the method has the characteristics of high integration, energy coupling, channelization and modularization, various traditional unit operations are replaced by strategic storage and controllable release of energy, energy consumption is greatly reduced, and equipment miniaturization is realized.

The invention discloses a dynamic coupling diffusion coefficient-based low-permeability reservoir oil-water displacement numerical simulation method, and belongs to the technical field of oil-gas field development numerical simulation. Comprising the following steps: based on reservoir physical properties and fluid parameters, establishing an oil-water two-phase expansion mass conservation equation in which a dynamic coupling diffusion coefficient is introduced; the coefficient is determined through a coupling function, so that the diffusion coefficient of each phase depends on the own saturation and the saturation and saturation gradient of the other phase at the same time; and on the basis of the initial pressure and the saturation field, performing iterative solution by adopting a Newton-Rafson method: in each iteration step, determining a diffusion coefficient of each phase according to the current pressure and saturation field, performing linear solution on the equation to obtain pressure and saturation increment, and updating the corresponding field. Repeatedly iterating until the pressure and saturation field variation is lower than a preset threshold value, and completing the numerical simulation of the oil-water displacement process; by depicting the dynamic interaction of the two-phase diffusion, the precision of the water-displacement-oil simulation is remarkably improved.

The application relates to a diffusion connection method based on pre-diffusion and post-membrane breaking, which is suitable for preparing an aluminum alloy laminated structure and relates to the field of welding. The application aims to solve the problems existing in the existing aluminum alloy diffusion connection technology and aluminum alloy laminated composite structure manufacturing technology, simplifies a process, and obtains aluminum alloy laminated composite structures of different scales under low-temperature and low-pressure welding conditions. The method comprises the following steps: 1, pretreating aluminum alloy base materials and a Zn intermediate layer; 2, heating, pressurizing and heat-insulating after assembling the aluminum alloy and the intermediate layer, so as to realize solid-phase diffusion connection; 3, applying ultrasonic waves after temperature rising to a liquid phase, so as to break the oxide film in the joint; and 4, continuing heat-insulating after temperature falling to joint solidification, so as to realize joint homogenization. The application breaks through the limitation of the aluminum alloy laminated composite material preparation process, is especially suitable for the preparation of aluminum laminated structures, such as micro-channel radiators, lithium battery tabs and aluminum honeycomb structures, and has great application prospects.

The invention relates to a diffusion coefficient determination method and device, computer equipment and a storage medium. The method comprises the following steps: applying a test current to a pre-prepared symmetric battery, and obtaining relaxation voltages at a plurality of acquisition moments after the application of the test current is stopped; wherein the symmetrical battery is a battery with a positive electrode and a negative electrode made of the same electrode material, the symmetrical battery comprises an electrolyte and two preset electrodes, and the solid phase diffusion coefficient of the preset electrodes is greater than a preset coefficient value; and determining the liquid phase diffusion coefficient of the electrolyte according to the relaxation voltages at the plurality of acquisition moments. By adopting the method, the liquid phase diffusion coefficient of the electrolyte can be directly determined, the test error can be reduced, and the test stability and the test result consistency can be improved.

This application provides a method, apparatus, device, and storage medium for determining the solid-phase diffusion coefficient of an electrode material. The method includes: acquiring pulse relaxation data of a battery; wherein the pulse relaxation data is the potential of the positive and / or negative electrodes of the battery within a preset time period after applying a pulse current to the battery in its state of charge, and the preset time period is shorter than the time required for the battery to reach its equilibrium potential; fitting the pulse relaxation data using a preset approximation function to obtain fitted data and an equilibrium potential; and determining the solid-phase diffusion coefficient of the battery's electrode material based on the fitted data and the equilibrium potential. This application's embodiment uses a preset approximation function to fit the pulse relaxation data within a short time period, thereby obtaining fitted data when the battery reaches potential equilibrium, and then obtaining the solid-phase diffusion coefficient based on the fitted data and the equilibrium potential. Therefore, it shortens the battery's resting time and improves the efficiency of obtaining the solid-phase diffusion coefficient.

This invention provides a tetrathiofulvalene tetrabenzaldehyde Schiff base cage compound, the molecular formula of which is C2. 126 H 108 N 16 S 12 The molecular weight is 2231.08, and the unit cell parameters are: a=17.0810(12)Å, b=19.3138(13)Å, c=22.0054(4)Å; α=104.811(2)°, β=101.466(2)°, γ=101.348(2)°, V=6639.3(8)Å. 3 The compound has a Z=2 crystal, space group P-1, and belongs to the triclinic crystal system. It exhibits a wide ultraviolet transmission cutoff edge above 400 nm and a significant near-infrared absorption rate. Near-infrared photothermal conversion performance tests show that the crystal can stably reach above 160°C in 40 seconds during 10 light-cooling cycles, demonstrating excellent photothermal conversion performance. This crystal is obtained through a liquid-phase diffusion method, where it is allowed to diffuse freely by layering and allowing it to stand still. This method offers advantages such as simple operation, the use of common organic raw materials, a short growth cycle, and stable physicochemical properties, making it suitable for various photothermal conversion materials.

Provided is a light detection device capable of suppressing a reduction in area efficiency while enhancing sidewall pinning. Specifically, the light detection device includes: a semiconductor substrate; a plurality of photoelectric conversion units formed in a two-dimensional array on the semiconductor substrate; and a trench separation structure formed in a region between the photoelectric conversion units of the semiconductor substrate to penetrate the semiconductor substrate from a back surface to a front surface of the semiconductor substrate. Then, at least a portion of the trench separation structure (one-side solid-phase-free diffusion) includes a portion that covers only the back side in order to cover one of the two side walls facing each other. And a p-type solid phase diffusion layer formed on each of the one side wall and the other side wall and completely covering the other side wall with respect to the other side wall.

Embodiments include a system for reducing noise-induced phase diffusion of an oscillator. The system includes a sensor, a first drive signal generator, an adaptive controller, and a second drive signal generator. The sensor is configured to generate a sensor output indicative of oscillations of an oscillator. The first drive signal generator is configured to receive the sensor output and generate, based on the sensor output, a first drive signal. The first drive signal is provided to the oscillator. The adaptive controller is configured to receive the sensor output and determine, based at least in part on the sensor output, one or more adaptive control parameters. The second drive signal generator is configured to receive the sensor output and the adaptive control parameters, and generate, based on the sensor output and the adaptive control parameters, a second drive signal. The second drive signal is provided to the oscillator.

The utility model relates to an insulating and sealing drainage structure for an AEM hydrogen production electrolytic cell, which is characterized in that the insulating and sealing drainage structure comprises a plate body, and a rectangular hole matched with a gas-liquid two-phase diffusion layer in size is formed in the middle of the plate body; a liquid inlet square hole and a gas and liquid outlet square hole are respectively formed in the plate body on the outer sides of the two ends of the rectangular hole; according to the utility model, the diversion trench structure is arranged on the insulated sealing drainage structure, so that the diversion trench can be prevented from being processed on the polar plate, and the processing efficiency of the polar plate is improved; a converging area is arranged on the diversion trench, and the rectangular hole is communicated with the liquid inlet square hole and the gas-liquid outlet square hole by adopting diversion trench units which are arranged in parallel; the parallel diversion trench units can more effectively ensure the rigid stability of the connecting part, and the phenomenon of damage is not easy to occur; the collecting groove is connected with the flow guide groove unit, so that the gas-liquid flow guide efficiency can be effectively improved, and meanwhile, the gas-liquid mixed flow phenomenon can be effectively avoided by increasing the groove depth of the collecting groove.

The invention discloses a directional direct diffusion bonding method for a refractory metal or alloy single crystal material. The method comprises the following steps: 1, preparing the refractory metal or alloy single crystal material into a cylindrical block, and then grinding and polishing; secondly, the ground and polished cylindrical block is subjected to electrolytic polishing; 3, performing crystal face calibration on the polished cylindrical block body by using an X-ray single crystal orientation device to obtain the actual position of a specified crystal face in the cylindrical block body; and fourthly, the two cylindrical blocks with the calibrated crystal faces are directionally assembled and fixed, and the refractory metal or alloy welding joint is obtained after vacuum diffusion connection. Directional assembly of the to-be-connected samples is achieved through crystal face calibration, the to-be-connected surfaces are tightly combined with the solid-phase diffusion connection technology, connection interface holes are efficiently closed, generation of interface small-angle crystal boundaries, recrystallized crystal grains and mixed crystals is inhibited, and the yield of the to-be-connected samples is improved. And the refractory metal and alloy welding joint with single crystal structure characteristics, good interface welding, few defects and high welding rate is obtained, and the method is suitable for the fields of nuclear reactors, medical equipment and the like.

A battery diffusion impedance decoupling method comprises the following steps: providing a battery which comprises a positive plate and a negative plate; performing discharging and relaxation operation on the battery to obtain solid-phase diffusion impedance R1 of the battery in the relaxation operation stage; performing infiltration operation on the positive plate and the negative plate to obtain a positive electrode infiltration rate K1 and a negative electrode infiltration rate K2 of the positive plate; and the positive electrode solid-phase diffusion impedance R2 and the negative electrode solid-phase diffusion impedance R3 of the battery are calculated through the solid-phase diffusion impedance R1 and the positive electrode infiltration rate K1 and the negative electrode infiltration rate K2 of the positive plate. Compared with a symmetric battery method and a three-electrode method, the battery diffusion impedance decoupling method has the advantages that the required time is shorter, the preparation period is shortened, and the experimental environment required by the discharge operation, the relaxation operation and the infiltration operation is simpler compared with the symmetric battery method and the three-electrode method, so that the preparation period is remarkably shortened by the battery diffusion impedance decoupling method; and the equipment and labor cost is greatly reduced.