651results about How to "Avoid defects" patented technology

The invention belongs to the technical field of biodegradable materials, and particularly relates to an environment-friendly degradable modified composite material, a preparation method and application. The material comprises PBAT, PBS, PLA, an inorganic mineral filler, natural plant fibers, PBAT-PTMO, nano-silica, an auxiliary agent and a plasticizer. In the preparation process, PLA is prevented from being hydrolyzed in vacuum drying, calcium carbonate and nano silicon dioxide are preheated and activated, natural plant fibers are dispersed through steam explosion and ethanol treatment, and raw material pretreatment comprises high-speed mixing and agglomeration breaking and medium-speed secondary premixing so as to realize uniform distribution. The co-rotating twin-screw extruder accurately controls the temperature, the speed, the rotating speed and the length-diameter ratio, and ensures melting plasticizing, uniform mixing and stable extrusion molding. According to the invention, by adopting accurate proportioning of multiple raw materials and a modification treatment process, the properties of mechanics, degradation, processing and the like of the material are synergistically improved, and the material is widely applied to multiple fields such as packaging bags, disposable tableware and agricultural plastic mulching films.

The invention provides a distributed electric vehicle steering stability early warning method, device, equipment and medium, and relates to the technical field of vehicle steering stability monitoring, the method comprises the following steps: building a digital twin model, realizing comprehensive mapping of a physical entity and a virtual entity, using CarSim and MATLAB / Simulink joint simulation platform, fusing multi-source data, and realizing early warning of the steering stability of a distributed electric vehicle. And the accuracy and reliability of the model are improved. Specifically, an LSTM neural network algorithm is adopted, key operation parameters of a vehicle are monitored and analyzed in real time, the maximum side slip angle and the yaw velocity are predicted, and therefore potential steering stability faults are warned in advance. Through comparison with real-time data acquired by a vehicle sensor, the system can accurately evaluate the driving state of the vehicle, and early warning is given out in time when abnormity is detected, so that a driver is reminded to take corresponding measures.

The invention provides a preparation method of a high-temperature-resistant antioxidant chopped carbon fiber reinforced ceramic-based composite material, and relates to the field of ceramic-based composite material preparation, and the preparation method comprises the following steps: S1, selection and surface treatment of reinforced fibers: selecting chopped carbon fibers as a reinforced material, and carrying out surface modification treatment on the chopped carbon fibers to obtain the reinforced fibers; according to the present invention, the surface modification treatment is performed on the short carbon fiber, and particularly the SiC coating is coated on the fiber surface by using the chemical vapor deposition (CVD) method, such that the oxidation resistance of the carbon fiber under the high temperature condition is effectively improved. The coating enhances the stability of the fiber, reduces the oxidation loss of the fiber at high temperature, enhances the interface bonding force between the fiber and the ceramic matrix, and avoids stripping or interface failure in a high-temperature environment, thereby ensuring the overall stability and service life of the material.

The invention discloses a PCB (Printed Circuit Board) defect identification method used in an automatic PCB sorting process, and relates to the technical field of defect identification, a visibility coefficient Kjxs is calculated based on the definition of a pattern formed by photoresist, an etching influence coefficient Syxs is calculated in combination with degree data after etching, and the etching influence coefficient Syxs is input into a defect evaluation model, so that the defect of the PCB is evaluated. Accurate evaluation of the defects is realized through a deep learning technology, and the method enables identification of the PCB defects to be more intelligent and efficient, and reduces manual intervention. On the basis of comparative analysis of the defect score Qpf and the preset evaluation threshold value Q, the system can automatically judge the defect condition of the PCB to be etched and adopt a corresponding automatic sorting mechanism, the intelligent automatic sorting mechanism can ensure that the qualified PCB enters the subsequent technological process, and the defective PCB is removed in time, so that the production efficiency is improved, and the production cost is reduced. And the risk that unqualified products flow into subsequent production links is reduced.

The invention relates to the technical field of ring piece rolling, and discloses a large special-shaped ring piece rolling forming process analysis method which comprises the following steps: (1) forge piece and blank design: designing different types of blanks; (2) material characteristic modeling: establishing a material model meeting rolling conditions; (3) finite element model establishment: establishing a geometric model of a rolling process by utilizing finite element analysis software; (4) rolling process scheme design: designing a plurality of rolling process schemes; (5) process simulation and defect prediction: analyzing strain, stress, temperature field and metal flow conditions in the simulated rolling process, and analyzing defect generation conditions; and (6) real-time monitoring and feedback control: monitoring changes of stress, strain and temperature in real time, and automatically adjusting process parameters. And through dynamic material characteristic modeling, a self-adaptive grid division technology and multi-physical field coupling analysis, the analysis accuracy of the rolling process is improved, so that defect prediction is more accurate, and the quality of finished products is improved.

The embodiment of the invention discloses a three-dimensional reconstruction method based on structured three-dimensional Gaussian representation. The method comprises the following steps: acquiring a target image containing a target object at multiple visual angles; generating an unstructured Gaussian primitive representation corresponding to the target object according to the target image; establishing a transmission matrix describing the unstructured Gaussian primitive distribution and the structured Gaussian primitive distribution, solving the transmission matrix by using an optimal transmission algorithm, and generating a structured Gaussian primitive representation corresponding to the target object according to the optimal transmission matrix; obtaining a text description for the target object, and complementing the structured Gaussian primitives according to the text description by using a diffusion model obtained by pre-training; and performing three-dimensional reconstruction by using the complete structured Gaussian primitive. According to the method, the optimal transmission algorithm is used for carrying out structured representation on the three-dimensional Gaussian primitives, and text description is used for complementing the Gaussian primitives through the diffusion model, so that the quality of three-dimensional reconstruction is improved.

The invention relates to the technical field of measurement and testing, in particular to a humanoid robot joint module performance testing system which comprises a testing frame and a top frame fixed to the surface of the testing frame and further comprises a compression resistance testing assembly arranged above the testing frame. The stress condition in an actual working state can be better simulated, accurate data support is provided for performance test and optimization of the joint module, the required pressure can be accurately applied under different test conditions by adjusting the output pressure of the loading hydraulic cylinder, the joint module is positioned by the positioning claw and the positioning block, and the test efficiency is improved. The pressure resistance and stability of the joint module in actual use can be better known, accurate data support is provided for design and optimization of a robot, deviation of measured data such as pressure and deformation caused by deviation of the joint module in the testing process is avoided, and therefore accurate performance testing data are obtained.

The invention belongs to the technical field of diaphragms, and particularly relates to an organic-inorganic composite spongy porous diaphragm as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a polyarylether high polymer material, a pore-foaming agent, metal oxide nanoparticles and an organic solvent, and carrying out defoaming treatment to obtain a membrane casting solution; preparing the membrane casting solution into a liquid membrane; the liquid film is placed in a wet air atmosphere for pre-phase inversion, in the pre-phase inversion process, water vapor in wet air and an organic solvent in the liquid film are subjected to preliminary exchange, a through spongy porous structure is induced to be formed in the liquid film, and a spongy porous liquid film is obtained; and placing the spongy porous liquid membrane in an extracting agent for phase inversion to obtain the organic-inorganic composite spongy porous diaphragm. The preparation method provided by the invention not only overcomes the defects of the existing diaphragm in pore channel connectivity and pore diameter control, but also remarkably improves the hydrophilic performance of the diaphragm, and greatly reduces the resistance at the same time.

The invention discloses a copper pipe cutting machine, and relates to the technical field of cutting machines, the copper pipe cutting machine comprises a machine tool, the middle of the machine tool is fixedly connected with a fixing frame, the top of the fixing frame is fixedly connected with a motor, an output shaft of the motor is fixedly connected with a first gear, the interior of the fixing frame is rotatably connected with a clamp, and the outer surface of the clamp is fixedly connected with a first gear ring; a clamping jaw is slidably arranged on the right side of the clamp, and a strip-shaped shell is fixedly connected between the left side of the fixing frame and the machine tool. The horizontal concentric positions of the stabilizing rings and the clamp are kept, the horizontal concentric positions of the stabilizing wheels and the clamp are also kept, rotation of the copper pipe can be kept stable through rolling, abutting and supporting of the stabilizing wheels on the copper pipe, and therefore the situation that due to the fact that the copper pipe is inclined, a cutter cannot evenly cut the copper pipe is reduced. And the copper pipe can be prevented from being impacted by the copper pipe, so that the service life of the cutting knife is prolonged.

The utility model relates to the technical field of laser welding, in particular to a laser welding system with an OCT (optical coherence tomography) online detection function, which comprises an OCT device, a laser processing system, an infrared sensor, a computer and a controller. The laser processing system is provided with a laser processing head, and the infrared sensor is used for acquiring a thermal induction temperature image so that the computer can generate a first control parameter; the OCT equipment is connected with the laser processing system through an optical fiber; the OCT equipment is used for providing a spectral interference fringe image for the computer; the computer is used for analyzing and processing the spectral interference fringe image to obtain a second control parameter; the controller is configured to control the laser processing head and adjust welding parameters in real time according to the first control parameter and the second control parameter; according to the laser welding system with the OCT online detection function, accurate welding is achieved, and various laser welding quality problems are effectively recognized.

The invention belongs to the technical field of force / position hybrid control of mechanical arm systems, and particularly discloses a finite-time self-adaptive impedance control method and system for a flexible joint mechanical arm system. In order to solve the problems that the control effect of a mechanical arm system is affected by nonlinear and unknown system model parameters at present and derivation is complex in backstepping design, the fuzzy self-adaptive finite time impedance controller is designed based on the impedance control technology so as to achieve hybrid control over the track and force of the tail end of the mechanical arm. In the design process of the controller, a real control law is constructed to realize finite time stability of the system; and meanwhile, command filtering and fuzzy self-adaptive technologies are introduced to solve the problems of calculation explosion in backstepping design and unmodeled dynamics of a mechanical arm system. By means of the control method, the influence caused by system uncertainty can be effectively overcome, the position tracking error of the mechanical arm system is reduced, and meanwhile it can be guaranteed that all signals in a closed-loop system are bounded within finite time.

The invention discloses a high-performance special ceramic material and a preparation process thereof, and the preparation process comprises the following steps: proportioning tungsten carbide, ternary boride, titanium nitride, molybdenum, nickel, silicon, cobalt and other raw materials with nano silicon carbide whiskers according to a ratio, carrying out ball milling treatment, adding a forming agent, and continuing ball milling and granulation; and then, carrying out compression molding on the ceramic powder, carrying out liquid phase sintering in a CO atmosphere, and cooling to room temperature to obtain the high-performance special ceramic material. The Mo3NiB3 ternary boride is introduced, so that the hardness and impact resistance of the ceramic material can be improved, the interface bonding force between a ceramic matrix and a reinforcing phase is enhanced, and the bending strength is improved; the nano silicon carbide whiskers are subjected to nickel plating treatment, so that the interface bonding force can be improved, microcracks are reduced, and the strength and toughness of the ceramic material are enhanced; by optimizing the sintering process and adopting a staged heating mode, grain growth can be controlled, and the density and mechanical properties of the ceramic material are effectively improved.

The invention discloses an X-ray thermoacoustic imaging method based on a multi-dimensional information fusion network, and relates to the technical field of artificial intelligence medical imaging. The method can adapt to rapid reconstruction of high-quality X-ray thermoacoustic images under different sampling conditions, effectively extract and utilize information of the signals and the images, guarantee the reconstruction quality through complementation of feature information in the signals and the images, reduce the time cost overhead, avoid the defects of a traditional X-ray thermoacoustic imaging method, and improve the imaging quality of the X-ray thermoacoustic images. And the development process of X-ray thermoacoustic imaging is accelerated.

The invention relates to an elevation control and precise regulation and control method for frozen sand mold additive manufacturing in a time sequence space. According to the method, a mathematical model that the thickness of floating sand changes along with time due to moisture heat exchange of the frozen sand mold in air is established, and the thickness of the floating sand of frozen sand molds with different curved surfaces under the parameter conditions of different environment temperatures, time scales, sand mold materials, moisture contents and the like is predicted and fed back; and in the freezing printing process, real-time adhesive and height compensation is carried out on sand molds at different wall thicknesses, and the dimensional precision and geometric precision of the frozen sand molds are protected to a certain extent. According to the method, the problem of dimensional accuracy error caused by floating sand generated by heat exchange in air in the manufacturing and subsequent placing processes of the frozen sand mold is effectively solved, and the dimensional accuracy of the sand mold during casting is ensured.

The invention belongs to but not limited to the technical field of welding, and discloses a power modulation galvanometer laser welding method and device for a zirconium alloy fuel rod. A laser beam adopts a circular scanning track for welding along a circumferential weld, the power of 36 phase points in the circular scanning track is adjusted, a gradient power mode that the middle is high and the two sides are low is adopted for welding, a molten pool is stirred through the rotating laser beam, flowing of the molten pool is aggravated, gas escape is promoted, and meanwhile in the power modulation mode, the welding speed is increased. The surface energy distribution of the whole molten pool is more uniform, the power of the edge position of the molten pool is reduced, the weld seam undercut degree is reduced, and weld seam surface forming is more uniform. Three welding production procedures are reduced into two welding production procedures, meanwhile, the rotating speed during fuel rod welding is increased, the welding procedures are optimized, and the welding efficiency is improved; in addition, the problem that oxidation color beside an end plug welding circumferential weld is heavy is solved; and the welding seam air hole defect is improved, and the welding quality is improved.

The invention discloses a mother substrate and a display panel using the mother substrate. The mother substrate is used for the display panel. A mother substrate for a display panel includes: a conductive ring disposed in a non-display area outside a display area and surrounding each of the display areas; and one or more dummy pixel driving circuits, the one or more dummy pixel driving circuits being disposed in a non-display area outside the display area. An electrostatic discharge (ESD) prevention structure inside the dummy pixel driving circuit may prevent defects of the display panel due to ESD occurring in a manufacturing process of the display panel.

The invention discloses a TOPCon battery front film layer with anti-UV attenuation effect and a preparation method thereof, belonging to the technical field of battery preparation. The invention adopts atomic layer deposition technology (ALD) and H2O as a precursor source to react in two stages to obtain a laminated aluminum oxide film layer with decreasing OH group content; then a silicon oxynitride film is added on the front laminated aluminum oxide film layer, and then a passivation film layer such as silicon nitride and silicon oxynitride is grown; the laminated structure can greatly reduce the interface state density of aluminum oxide and protect the passivation film layer; at the same time, the silicon oxynitride film layer and the heating process are added, so as to improve the film layer's blocking ability to H ions after UV irradiation, promote the crystallization of the aluminum oxide film layer, increase its effective thickness, and further improve its chemical passivation and field passivation effects, thereby reducing the UV attenuation effect of the TOPCon battery, improving the reliability measures of anti-UV attenuation, and compensating for the high efficiency loss of a single process of increasing the ALD reaction cycle.

The utility model provides a uniform cooling device for hot-rolled low-carbon strip steel. The uniform cooling device comprises a laminar cooling section, an aerial fog cooling section and a water replenishing cooling section which are sequentially arranged between a finishing mill group and a coiling machine, the laminar cooling section comprises a first-stage laminar cooling mechanism, a second-stage laminar cooling mechanism and a third-stage laminar cooling mechanism which are arranged in sequence; and an infrared imager for monitoring the transverse temperature of the strip steel in real time is arranged at the upstream of each stage of laminar cooling mechanism. Each stage of laminar cooling mechanism comprises four rows of cooling headers arranged side by side, one end of each cooling header is connected with a cooling water supply pipe, the other end of each cooling header is connected with two columns of gooseneck pipes, the gooseneck pipes are evenly distributed in the width direction of the low-carbon strip steel, the adjacent columns of gooseneck pipes are arranged in a staggered mode, and each gooseneck pipe is provided with an electric valve with the adjustable opening degree.

The invention provides a wafer bonding method, which comprises the following steps that a first silicon substrate is provided, a plurality of concave cavities are formed in a preset area of the first silicon substrate, the concave cavities are opened from the top surface of the first silicon substrate and extend downwards by a preset depth, and getter layers are formed on the bottom walls and the side walls of the concave cavities; providing a second silicon substrate, and directly bonding the first silicon substrate and the second silicon substrate; and annealing treatment. According to the invention, by introducing the activation treatment, the first silicon substrate and the second silicon substrate can realize high-quality bonding at a low temperature, and a strong bonding force is maintained. Meanwhile, a plurality of concave cavities filled with getter layers are formed in the first silicon substrate, and the getter layers are activated by adopting vacuum heating treatment, so that the getter layers can quickly and effectively absorb gases such as water vapor and the like generated on an interface in the low-temperature annealing process, the gases are effectively prevented from being accumulated at the bonding interface, cavities are effectively prevented from being formed, and the bonding quality of the semiconductor device is improved. And the reliability and the stability of direct bonding are further improved.

The invention discloses a preparation method and application for directly growing CuCoO2 on foamed nickel, and the preparation method comprises the following steps: dissolving copper nitrate, cobalt nitrate and a mineralizer in a solvent, intensely stirring to form a suspension A, then transferring the suspension A into a high-pressure kettle, and carrying out vacuum drying to obtain CuCoO2; meanwhile, the foamed nickel is placed in a polytetrafluoroethylene flower basket and then placed in an autoclave to be heated for a hydrothermal reaction, and after the hydrothermal reaction is finished, the foamed nickel is cooled to the room temperature. According to the method, the CuCoO2 electrode with the foamed nickel substrate can be prepared in one step, compared with a method for preparing CuCoO2 powder and then transferring the CuCoO2 powder to an electrode plate, the needed time is short, operation is easy, the electrode material is uniform, and the method can be widely applied to related fields as an efficient photoelectric functional material electrode preparation method.

The invention discloses a rectal cancer prognosis intelligent analysis method based on two-stage 3D feature extraction. The method comprises the steps of obtaining a prognostic MRI image of a target patient, constructing a 3D convolutional neural network based on a 3D-Unet architecture, performing staged training on the 3D convolutional neural network, and generating a rectal cancer tumor extraction model; taking the preprocessed MRI 3D image as a model input, segmenting a rectal cancer tumor image, and outputting a 3D tumor image and a risk score in stages; and performing prognosis evaluation by combining the risk score with clinical data of the target patient to obtain the survival rate of the target patient. According to the invention, the 3D tumor information in the MRI image can be extracted, the accuracy of prognosis analysis is further enhanced, a more accurate and more reliable prognosis result is provided, and the clinical decision is improved.

The invention belongs to the technical field of titanium-based thin-wall component machining, and discloses a method for machining a high-temperature-resistant titanium-based thin-wall component through cold spraying additive-hot pressing and the like. A titanium-based layered gradient structure prefabricated blank is prepared mainly through a cold spraying method, and machining of the high-performance and high-temperature-resistant titanium-based thin-wall component is achieved in combination with a subsequent equal material technology. The processing and preparing process comprises the steps that the component content of the titanium-based composite powder is determined; preparing composite powder; carrying out cold spraying additive printing to obtain a layered gradient preformed thin-wall blank; and carrying out reaction hot pressing to form the high-temperature-resistant thin-wall component. By means of the method, high-production-efficiency, low-cost and high-performance manufacturing of the high-temperature-resistant layered gradient titanium-based composite material or the titanium-aluminum intermetallic compound thin-wall component can be achieved; the high-temperature-resistant thin-wall component with the maximum service temperature of 800 DEG C can be machined and prepared according to the target service temperature requirement, and customization of the service performance can be achieved according to the mechanical property requirement of the component.

The invention discloses a process for processing a diamond blind groove by water-guided laser, which not only can optimize a laser incident angle, reduce a scattering effect and improve the smoothness of a groove wall through multi-angle compensation, but also can avoid periodic lines and defects caused by single-direction processing. The laser focus is always matched with the material surface through dynamic angle adjustment, the energy attenuation problem caused by depth increase is effectively relieved, and uniform machining of the bottom of the deep groove is ensured. And a complex multi-taper or gradual change structure can be realized, and the machining flexibility is obviously improved. Meanwhile, heat distribution is improved through multi-angle machining, the influence of heat accumulation on material performance is reduced, a water flow guide field is optimized, machining stability is enhanced, the limitation of the depth-diameter ratio is broken through, and the removal rate and machining precision are improved.

The invention relates to the technical field of flat wire stator head twisting equipment control, and discloses a process calculation method and system of flat wire stator head twisting equipment and the head twisting equipment, and the method comprises the steps: obtaining a plurality of setting parameters of a head twisting process input by a user; calculating according to the plurality of setting parameters to obtain an operation result; inputting an operation result into a point set formula of each layer of the torsion head module to obtain a data set, wherein the point set formula comprises a parameter equation and a compensation equation of spatial displacement; and writing the data set into a control file of a preset path, and performing a head turning process on the flat copper wire after the flaring process based on the control file. According to the invention, the motion trail of the equipment is approximate to the motion trail of the copper wire bending point, the copper wire is prevented from being scratched due to large relative displacement between the head twisting die and the copper wire bending point, the process trail of the product equipment and the model changing calculation can be quickly carried out, the device can adapt to the production of flat wire products with different specifications, the production efficiency is improved, and the production cost is reduced. The processing time is reduced.

The invention provides a thermal slip temporary bonding adhesive and a preparation method and application thereof, and the thermal slip temporary bonding adhesive is prepared from the following raw materials in parts by weight: 50-70 parts of an organic solvent; 15 to 25 parts of basic resin; 10 to 21 parts of tackifying resin; 0.2 to 2 parts of an auxiliary agent; the basic resin comprises any one or a combination of at least two of a cycloolefin copolymer, a cycloolefin polymer and a cyclic block copolymer; the tackifying resin comprises low molecular weight polymer resin and other tackifying resin. The thermal slip temporary bonding adhesive provided by the invention has excellent chemical corrosion resistance and excellent bonding performance, is tightly combined with a wafer and a substrate, can well bond the wafer and the substrate together, and effectively prevents bonding pair defects; the temporary bonding adhesive is excellent in high temperature resistance, and can stably play a role without denaturation in the processing processes of wafer thinning and the like.

The invention discloses a high-stability detachable inflatable antenna base supporting structure which comprises a fixed base, a movable square box, a supporting rod and a lateral thrust structure. The fixed base is arranged on the ground, a movable square box is installed at the top of the fixed base, a supporting rod is horizontally installed on the movable square box, and the lateral thrust structure is fixed to the supporting rod and used for laterally supporting an antenna body. According to the invention, by introducing a plurality of lateral thrust structures, the lateral force resistance and stability of the supporting structure are obviously enhanced; particularly, the performance is excellent in a strong wind or vibration environment, and the shaking risk is reduced.

The invention relates to the technical field of data processing, in particular to an injection molding method of an automobile connector, related equipment and a storage medium. The injection molding method specifically comprises the steps that a corresponding design precedence coefficient is calculated based on design parameters of the connector and a mold of the connector, the method comprises the following steps: determining injection pressures of different filling stages based on change characteristics of monitoring data of different stages in an injection filling process and a design preceding coefficient, constructing injection speeds of all moments of an initial filling stage based on average difference of the injection pressures of adjacent moments in combination with injection speeds of previous moments of all the moments, and constructing injection speeds of all the moments of the initial filling stage in combination with the unique injection pressure. The injection speed of the middle-stage pressure stabilization stage is calculated; accurate injection molding is conducted on the automobile connector according to the injection speed at each moment in the injection filling process, the problem that when injection molding is conducted through fixed preset injection molding parameters, due to the fact that design forms of different connectors are different, the injection molding result may have defects is solved, and defects of finished products are prevented. And the consistency and the production efficiency of finished products are ensured.

The invention discloses a real-time communication system based on dynamic broadcast routing. The real-time communication system comprises a system driving program of a broadcast network and a system application program corresponding to the system driving program, the system application program performs data communication with the system driving program through an interface, receives user data or a data packet, constructs and analyzes a broadcast link control packet, and obtains a private routing table of wireless communication equipment according to a complete path table of a broadcast network; the system driving program is located in a kernel program of an operating system, and is combined with the system application program to modify routing logic of a network protocol stack of the operating system, the routing logic comprises routing table maintenance, path selection and actual forwarding of broadcast data packets, and dual functions of data transmission and network monitoring are completed; the method specifically comprises the following three stages: the first stage is a broadcast network construction stage, the second stage is a routing path distribution stage, and the third stage is a broadcast network data transmission and routing maintenance stage. According to the invention, the standard RTP data packet is used as a monitoring object, and the monitoring of the link state is realized while the standard RTP data packet is used for bearing the broadcast data, so that the dual functions of data transmission and network monitoring can be completed without extra overhead; the method has the advantages of low network bandwidth occupation, expandability and good network applicability.

The invention discloses a self-twisting high-thermal-conductivity flexible graphene fiber and a preparation method thereof. Water is added into an organic-phase graphite oxide spinning solution, an organic phase and a water phase exist in the gel fiber in the solidification and drying process at the same time, the solvent concentration gradient and the surface tension gradient exist on the fiber surface due to the non-uniformity of the volatilization rate of a dual-phase solvent, and the non-uniformity causes the Mallangori effect and enables the gel fiber to generate rotary self-twisting. According to the method, controllable adjustment of the fiber twist can be realized by adjusting the water content of the initial spinning solution, and the self-twisted fiber is subjected to chemical reduction and graphitization treatment, so that the high-thermal-conductivity flexible graphene fiber can be obtained.

The invention provides a high-heat-conductivity diamond / metal joint and a brazing method thereof, and relates to the technical field of dissimilar material brazing connection. A brazing method for a high-heat-conductivity diamond / metal joint comprises the following steps that the surface of a diamond is machined through laser, and a periodic micro-nano structure is drawn on the surface of the diamond; and the surface, drawn with the periodic micro-nano structure, of the diamond is coated with brazing filler metal, fixing is carried out according to a diamond / brazing filler metal / metal sandwich structure, vacuum brazing is carried out, and the high-heat-conductivity diamond / metal connector is obtained. A periodic micro-nano structure is introduced into a diamond ablation area in the laser processing process, so that more efficient heat transfer and heat conduction performance improvement of an interface can be realized, the interior of a joint structure is uniform and has no defect, and the mechanical property of a joint is improved; the problem that the traditional connection technology is difficult to meet the mechanical property and heat transfer performance requirements of the diamond / metal interface at the same time is solved.