2950 results about "Composite plate" patented technology

The invention discloses a composite board ultrasonic defect detection method which comprises the following steps: S1, fixing a carbon fiber circumferential winding composite pressure container on a bracket, and establishing a coordinate system with the axis of the container as a z axis; s2, a 40 MHz dry coupling phased array ultrasonic probe is attached to the scanning starting point, and the contact angle of the probe is recorded; s3, moving the probe along the spiral track of the outer surface of the container at the speed of 20mm / s, and collecting A-scanning echo signals of all array elements; s4, performing pulse compression and time domain deconvolution processing on the acquired signal to obtain a time domain echo sequence; s5, delay time is calculated according to the shell curvature, the array element signals are compensated, and focusing B-scanning data are generated; s6, splicing the B-scanning data at the step length of 0.5 mm * 0.5 mm, and reconstructing C-scanning data corresponding to the space coordinates; and S7, inputting the C-scanning data into the trained Transform network, and outputting defect types, sizes and three-dimensional coordinates. The method realizes high-frequency ultrasonic composite board defect accurate detection, remarkably improves the microcrack recognition rate, and is widely applied to safety evaluation scenes of high-pressure hydrogen storage tanks and pressure vessels.

A process or method for manufacturing a fire-retardant treated wood composite board or panel, such as oriented-strand board, with a low melting point fire retardant (FR) material, such as boric acid, while the press is operating at typical press temperatures above the FR material melting point. An intervening overlay is applied to the top surface of the mat on the forming line, after the use or application of any FR material within or on the mat, prior to entry into the press. The intervening overlay covers the top surface so as to prevent the melting fire retardant material from contacting the press platen(s). After pressing, the intervening overlay may be removed from the top surface by sanding, buffing, or other methods. The intervening overlay also may be sized so as to extend over one or more edges of the underlying panel, for ease of removal post-process.

The invention provides a titanium-steel composite plate manufacturing optimization method and system based on a neural network model, and relates to the technical field of artificial intelligence, and the method comprises the steps: collecting interface data in a titanium-steel composite plate manufacturing process, and generating interface combination features; inputting the interface bonding features into an adaptive memory network, and predicting interface bonding strength; generating an optimized process parameter combination through a double-delay depth Q network structure with a priority experience playback mechanism; and taking the optimized process parameter combination as an initial population, and generating an optimal process parameter scheme based on performance indexes and process stability by adopting a phase change temperature point staged control and theory-differential gradient fusion mode.

The invention discloses an electronic packaging heat dissipation substrate and a processing technology and application thereof. The electronic packaging heat dissipation substrate comprises a copper-clad diamond copper plate, a diamond sheet located on the copper-clad diamond copper plate and a first copper layer covering the diamond sheet. The copper-clad diamond copper plate comprises a diamond copper core material and a copper layer located on the surface of the diamond copper core material. The diamond copper core material and the copper layer form a composite board with a copper layer-core material-copper layer sandwich structure; and the copper-clad diamond copper plate, the diamond sheet and the first copper layer are connected into a whole through brazing. According to the electronic packaging heat dissipation substrate, the peeling and cracking risks can be reduced, and the problem of low heat transfer efficiency is solved.

The invention discloses a planar phased array ultrasonic transducer, and relates to the technical field of transducers, the planar phased array ultrasonic transducer comprises a 1-3 type piezoelectric composite board, a common positive electrode panel and a flexible circuit board, the 1-3 type piezoelectric composite board comprises a polymer frame and a plurality of PZT piezoelectric ceramic columns, all the PZT piezoelectric ceramic columns are embedded in the polymer frame in an array, and the PZT piezoelectric ceramic columns are connected with the flexible circuit board. One end of each PZT piezoelectric ceramic column is a positive electrode end, the other end of each PZT piezoelectric ceramic column is a negative electrode end, the common positive electrode panel is connected with the positive electrode ends of the PZT piezoelectric ceramic columns, the flexible circuit board is provided with a bonding pad area and at least one pin area, the bonding pad area is fixedly provided with a plurality of bonding pads, the pin area is fixedly provided with a plurality of pins, and the flexible circuit board is provided with a plurality of conductive terminals. All the pins, all the bonding pads and all the negative electrode ends of the PZT piezoelectric ceramic columns are in one-to-one correspondence, the bonding pads are electrically connected with the pins, and the bonding pads are connected with the negative electrode ends of the PZT piezoelectric ceramic columns; according to the invention, the PZT is applied to the planar phased array ultrasonic transducer.

The invention discloses a method for preparing a copper-aluminum layered composite board by introducing laser into an intermediate layer, which comprises the following steps: introducing laser into the intermediate layer (Al-Cu-Mg-Si-Zr-Sc series alloy), so that on one hand, copper and aluminum to be compounded are in a heating state to be subjected to rolling compounding by utilizing the heat conduction effect of the heated intermediate layer; the rolling reduction rate and the rolling mill capacity requirement are obviously reduced; and on the other hand, the added middle layer has excellent obdurability, so that the cooperative deformation capacity between the to-be-compounded dissimilar materials can be improved, and the interface bonding performance of the composite material is improved. And a mode of'introducing laser into the middle layer and carrying out short-time online annealing treatment 'is adopted to replace'large down pressure and long-time diffusion annealing' adopted by a traditional copper-aluminum composite material, so that the processing and forming efficiency of the copper / aluminum composite material is remarkably improved, and the method has the characteristic of short process.

The invention discloses a thermal insulation color steel sandwich composite board product quality detection system based on digital twinning, and particularly relates to the field of quality control. The system comprises a composite board full-dimension three-dimensional digital model construction module, a production digital twinborn body creation module, a total-factor real-time data acquisition module, a data preprocessing module, a twinborn data driving and model calibration module, a quality intelligent analysis decision module and an optimization execution module. The model construction module constructs a reference model and embeds a process standard and a quality threshold value; the twin creation module builds a virtual production line, standardizes a data interface and assigns an ID to a plate; the data acquisition module acquires real-time data; the preprocessing module removes abnormal values, standardizes data and associates the data; the calibration module updates the twin body, calculates the deviation and calibrates the model; the analysis module realizes compliance judgment, defect analysis and quality prediction; and the optimization module generates and executes an instruction, so that the problems of low efficiency, data splitting and no closed loop of traditional detection are solved, and the quality control precision and efficiency are improved.

The invention relates to the technical field of metal composite material rolling, and discloses equipment and a process for hot-warm wave flat rolling of a titanium steel composite plate. The rolling assembly comprises a first rolling piece and a second rolling piece, and a plate is firstly subjected to corrugated rolling through the first rolling piece and then subjected to flat rolling through the second rolling piece; the straightening part is used for straightening the plate subjected to corrugated rolling; the conveying part is arranged on the rack, located above the first rolling part and used for stably conveying the heated plate; and the heating assembly comprises a heat preservation piece and two heating pieces, the two heating pieces are arranged on the first rolled piece and the second rolled piece correspondingly and used for heating the plate materials before rolling, and the heat preservation piece is arranged on the conveying piece and used for conducting heat preservation on the conveyed plate materials. According to the invention, the bonding strength of the composite plate is improved, the residual stress of the rolled plate is reduced, the phenomena of tail slippage, tail cracking, oxidation and the like of the plate are avoided, and the phenomenon of surface cracking caused by poor metal plasticity is avoided.

The invention relates to a vacuum electron beam welding method for an extra-thick double-sided stainless steel composite blank. The vacuum electron beam welding method comprises the steps that S1, a blank is prepared; s2, processing the surface of the base material carbon steel; s3, processing the surface of the composite stainless steel; s4, assembling and vacuum electron beam direct welding are carried out twice; s5, performing surface anti-oxidation spraying and packaging treatment on the double-sided composite blank after secondary welding; s6, heating the composite blank in a heating furnace, and rolling; and S7, the composite blank is rolled to the thickness required by the product according to the rolling ratio required by the finished product, and the stainless steel + carbon steel + stainless steel extra-thick double-sided stainless steel composite plate can be obtained after cooling. According to the method, the key technical bottleneck of producing the extra-thick double-sided stainless steel composite blank through the vacuum electron beam welding process is solved, particularly, the influence of vacuum electron beam welding magnetic blowing is eliminated, and powerful technical support can be provided for follow-up variety development and stable production.

The invention discloses a composite cold plate-phase change cold storage coupled liquid cooling server heat dissipation device, which comprises a composite plate assembly, the composite plate assembly comprises a cold plate seat, a cold plate module, a phase change cooling module, an input port, an output port and an assembling mechanism, the cold plate seat is internally provided with a supporting and lining groove, and the supporting and lining groove is internally provided with a supporting and lining groove; the phase change cooling module is installed at the lower end of the cold plate module in an embedded mode, the input port and the output port are installed on the upper end face of the cold plate module, the lower end face of the cold plate module is movably connected with the upper end face of the supporting and lining groove, and the cold plate module is connected with an inner cavity of the cold plate base in a sleeved mode. A first connecting pipe is installed between the circulating pump and the output port and used for circulating cooling liquid in the circulating pump, and the cold storage assembly comprises a liquid storage box, a cover plate, cooling fins and a cooling fan. Through the coupling design of the composite cold plate and the phase change material, efficient absorption, dynamic buffering and multi-stage recovery of heat of the server are achieved, and the bottleneck of traditional liquid cooling heat dissipation is broken through.

The invention belongs to the technical field of metal composite materials and hydrogen storage and transportation materials, and particularly relates to a high-strength hydrogen-embrittlement-resistant layered metal composite material for hydrogen storage and a preparation method and application of the high-strength hydrogen-embrittlement-resistant layered metal composite material. According to the preparation method, the nickel-saving austenitic stainless steel (NEASS) and the 30CrMo steel are alternately overlapped in a multi-layer mode, and the processes of vacuum electron beam welding, high-temperature hot rolling, accumulative ply rolling, multi-stage heat treatment and the like are combined, so that the composite board with the layer number reaching hundreds of layers, firm interface bonding, excellent mechanical performance and good hydrogen embrittlement resistance is prepared; the technical problem that strength, toughness and hydrogen brittleness resistance of an existing metal material in a high-pressure hydrogen environment are difficult to consider at the same time is solved. The obtained composite material has high strength, high plasticity and excellent hydrogen embrittlement resistance, and is suitable for structural materials of high-pressure hydrogen storage tanks, hydrogen conveying pipelines and other key hydrogen energy equipment.

A disclosed nondestructive testing device for internal defects of a copper-aluminum composite board comprises a base plate, the base plate is connected with a C-shaped frame through an integral moving device, the upper end and the lower end of the C-shaped frame are respectively provided with an X-ray source and a ray detector, and the X-ray source and the ray detector are oppositely arranged; a signal conversion device, a high-voltage power supply and a control host are further arranged on the bottom plate, the high-voltage power supply is connected with the X-ray power supply, and the ray detector is in electric signal connection with the control host through the signal conversion device. The X-ray principle is utilized to irradiate the copper-aluminum composite board, the density difference in the board is reflected through the X-ray imaging board, the internal defects of the board are automatically judged through an algorithm, X-rays penetrate through the detected board and do not affect or damage the board, and the non-contact detection mode is compared with a destructive detection means, so that the detection accuracy is improved. The problem that a product is damaged in the detection process is solved.

The invention relates to the technical field of wood strength detection, in particular to a strength testing device for a wood composite board and a detection method.The strength testing device comprises a base table and a driving base fixed to the base table, and is characterized by further comprising symmetrical supporting mechanisms; a driving mechanism is arranged in the driving base so as to drive the two sets of supporting frames to be close to or away from each other. A centering roller and first pressure sensor cooperation mechanism of the transverse centering mechanism is adopted, a roller driving mechanism is combined to drive a driving roller to rotate, a plate is driven to transversely move through friction force, two sets of first pressure sensors detect the pressure bearing value of the roller in real time, and rotation is stopped when the numerical values on the two sides are equal; the transverse center of the plate is aligned with the axis of the driving roller, and personal errors are eliminated.

A copper-aluminum composite plate material prepared by aluminum liquid continuous casting and a process thereof. The method includes: S1, heating an aluminum ingot to 700-800° C. and smelting for 1-3 h; S2, degassing smelted aluminum liquid, and keeping the temperature and standing; S3, texturing a copper strip, and then cleaning; S4, heating the pretreated copper strip to 200-650° C.; S5, under the protection of inert gas, continuously casting the treated aluminum liquid on the treated copper strip, performing quenching crystallization on a copper-aluminum composite material, and performing oxygen-free continuous casting; and S6, continuous rolling: rolling the continuously cast copper-aluminum composite material to obtain the copper-aluminum composite plate material prepared by aluminum liquid continuous casting.

The invention relates to the technical field of composite material mechanical property detection, in particular to a composite material plate compression test clamping device, which comprises a fixed seat, and a clamping mechanism, a power device and a loading assembly which are arranged on the fixed seat, the clamping mechanism comprises a first clamping assembly and a second clamping assembly which are oppositely arranged, the first clamping assembly is driven by a power device to move towards the second clamping assembly, the sample plate is clamped and fixed from the two sides of the sample plate, and the stability of uniform clamping of the sample plate is ensured. The first movable clamping plate and the second movable clamping plate are connected with the loading assembly and are driven by the loading assembly to move towards the first fixed clamping plate and the second fixed clamping plate respectively. A clamped and fixed sample plate is vertically loaded by independently controlling a loading assembly, the loading assembly comprises a downward pressing seat and a loading rod arranged on the downward pressing seat, a ball head part of the loading rod is rotationally connected with the downward pressing seat, a ball joint can compensate the installation angle deviation of the sample, and it is ensured that a compression load acts on the center of the sample plate in the vertical direction all the time.

The invention discloses a hot continuous rolling preparation method of a single-sided stainless steel composite plate, which comprises the following steps of: milling and grinding one surface of each of two base materials according to a relative shape complementation mode; the surface is machined into an irregular concave-convex surface comprising n planes which are sequentially connected in the transverse direction or the longitudinal direction, the base material is a non-uniform-thickness blank with the thickness non-monotonically changing in the transverse direction or the longitudinal direction, and n is larger than or equal to 2; assembling according to the stacking sequence of the base material, the composite material, the composite material and the base material to prepare a composite blank; the composite blank is heated at the temperature of 1210-1270 DEG C, then hot continuous rolling is conducted, rolling is conducted for 1-3 passes at the temperature of 1180-1240 DEG C, and the rolling reduction is larger than or equal to 30 mm; rolling is conducted for 3-5 passes at the temperature of 1050-1170 DEG C, and the rolling reduction is larger than or equal to 28 mm; the initial rolling temperature is larger than or equal to 950 DEG C, the finish rolling temperature is larger than or equal to 850 DEG C, then cooling is conducted, and coiling is conducted at 560-660 DEG C; and flattening the obtained composite coil, and then carrying out stack cooling between two steel plates with the temperature of Tf-Tf + 150 DEG C.

The invention discloses a production method of a T2+Q355B copper steel rolled composite plate. The technological process comprises the steps of assembling, heating, rolling, stack cooling, finishing, flaw detection and warehousing. A T2 + Q355B copper steel rolled composite plate with excellent bonding strength, mechanical property and conductivity is obtained by adopting a vacuum rolling composite technology, a symmetric assembly technology and a low-speed deformation technology and utilizing wide and thick plate production line equipment and technical advantages, the thickness of a base material ranges from 5 mm to 40 mm, the thickness of a composite layer ranges from 1 mm to 20 mm, the width is smaller than or equal to 3600 mm, the yield strength is larger than or equal to 250 Mpa, the tensile strength ranges from 350 Mpa to 600 Mpa, the shear strength is larger than or equal to 120 Mpa, and the composite layer T2 copper conductivity IACS is larger than or equal to 85%. The intergranular corrosion crack rate is 0. The product can be widely applied to the fields of high-voltage electric appliances, ship manufacturing, new energy equipment and the like, and has the potential of replacing traditional products.

The invention provides a method and device for preparing a composite board based on laser remelting and ultrasound, and relates to the technical field of composite board preparation. The method specifically comprises the steps that a molten pool is formed on a first metal plate to be compounded through laser remelting, a fiber laying manipulator control system is started, a fiber laying manipulator is made to lay carbon fibers into the molten pool according to a preset track of a laser remelting head, ultrasonic vibration is started at the same time, and a preformed composite plate is obtained; the molten pool on the preformed composite board is solidified through a temperature control system, ultrasonic vibration is started at the same time, and a metal / carbon fiber mechanical-metallurgical composite interface is formed; and a second metal plate to be compounded is compounded through roller pressure, and the metal / fiber / metal three-layer composite plate is obtained. The device comprises a laser remelting and fiber laying manipulator, a temperature control system and an ultrasonic vibration probe. According to the invention, laser remelting and ultrasonic vibration are combined to form a metal / carbon fiber mechanical-metallurgical composite interface, so that the interface strength of the composite board is enhanced, and the practicability of the composite board is improved.

The invention discloses a copper-aluminum composite board and a preparation method thereof. The preparation method comprises the following steps: pretreatment; rolling is conducted; and friction stir welding. Through combined use of rolling and friction stir welding, energy consumption in the production process can be effectively reduced, defects of a composite interface and the number of intermetallic compounds can be reduced, the influence of a copper-aluminum composite interface on the overall conductivity is effectively reduced, the quality of the copper-aluminum composite pole is improved, and the production cost is reduced. And the prepared copper-aluminum composite board is excellent in comprehensive performance, and the service life of the battery is prolonged.

The invention provides a wave finite element and boundary element mixed composite board structure sound insulation performance prediction method, and the method belongs to the acoustics field, and comprises the steps: carrying out the post-processing of a wave finite element model based on the wave finite element model of a composite board structure and a corresponding equivalent nodal force, and obtaining the wave finite element equation of the whole composite board structure; based on a sound-structure coupling equation, through a boundary element method, a discrete boundary element equation related to the surface vibration speed of the composite board and the radiation sound wave pressure is constructed; coupling the wave finite element equation and the discrete boundary element equation of the whole composite board structure, and determining the sound pressure of radiation sound waves of the composite board structure and the surface vibration speed of the composite board; and based on the sound pressure of the radiation sound wave of the composite board structure and the surface vibration speed of the composite board, obtaining a sound insulation performance prediction result by calculating the sound power of the incident sound wave and the radiation sound wave, and completing prediction of the sound insulation performance of the composite board structure. The problems that the sound transmission loss of large plates and medium-high frequency plates is difficult to predict and the calculation cost is high are solved.

The invention discloses a quality evaluation method and system for a composite board, and relates to the technical field of quality detection, and the method comprises the steps: constructing a latent variable feature space representing interface binding energy abnormity based on an initial response data field through a physical constraint relation between interface local response features and binding energy distribution; extracting a topological correlation structure between local latent variable features in the latent variable feature space through a graph convolutional network to obtain a local binding energy anomaly initial candidate region; active response mode enhanced excitation is carried out on the local area of the initial candidate area, the dynamic enhanced response of each local area is obtained, and a binding energy abnormal area is determined; determining the specific position and range of the hidden pseudo solder strip according to the correlation topological structure difference between the local feature in the binding energy abnormal region and the normal region; according to the method, precise identification and high-precision positioning of the titanium-steel composite plate interface hidden cold solder strip are realized.

The invention provides a preparation method of a small-caliber titanium-steel composite pipe, which comprises the following steps: firstly, carrying out pipe bending forming on a titanium-steel composite plate by adopting a JCO process, and then carrying out titanium-titanium and steel-steel welding to obtain a titanium-steel composite welded pipe; and then annealing the titanium steel composite welded pipe obtained in the previous step, and then carrying out cold machining and vacuum annealing to obtain the small-caliber titanium steel composite pipe. The cold processing comprises cold rolling and / or cold drawing. According to the preparation method of the small-caliber titanium-steel composite pipe, the technical difficulty of direct compounding is reduced, the welding operation problem of small-caliber pipe titanium on the inner side is avoided, and meanwhile, the appearance precision of a cold-drawn product is higher. According to the method, the bonding strength can be guaranteed, high-precision control is achieved, and continuous and large-scale production capacity can be achieved. By the adoption of the mode, the high-precision titanium steel composite pipe with the diameter smaller than 300 mm can be obtained, and the average economic benefit can reach 0.5 million yuan / ton.

The invention relates to the technical field of titanium-steel composite plates, and particularly discloses a high-thermal-conductivity titanium-steel cold-rolled composite plate and a preparation method thereof.The preparation method comprises the steps that plasma etching treatment is conducted on a titanium plate, a TiB2-graphene heat conduction layer is arranged on the etched surface in a laser cladding mode, and an aluminum oxide whisker layer is deposited on a stainless steel plate through plasma electrolysis; the preparation method comprises the following steps: spraying nano-copper slurry on the surface of aluminum oxide whiskers, curing, carrying out composite rolling on a modified titanium plate and a stainless steel plate, and carrying out annealing and tempering treatment after rolling to obtain the high-thermal-conductivity titanium steel cold-rolled composite plate.

The utility model discloses a stainless steel composite board surface polishing device which comprises an installation frame, the installation frame is horizontally and rotatably connected with a driving shaft, and the installation frame is further fixedly connected with a motor in transmission connection with the driving shaft. The multiple driving wheels are distributed in the axial direction of the driving shaft at equal intervals, all the driving wheels are connected with the driving shaft through connecting bearings, and clutch mechanisms are arranged between all the driving wheels and the driving shaft; the driven wheel is connected with the mounting frame through a lifting mechanism, and an abrasive belt is arranged between the driving wheel and the driven wheel; and the tensioning wheel is arranged on the inner side of the abrasive belt and is in rolling connection with the abrasive belt, and the tensioning wheel is connected with the mounting frame through an elastic piece. The polishing device is provided with a plurality of abrasive belts of different models, and different abrasive belts can be switched to be used through the lifting mechanism and the clutch mechanism, so that the time for replacing the abrasive belts is saved, and the machining efficiency of the device is improved; the multiple abrasive belts are used at the same time, the grinding range of the grinding device can be enlarged, and the grinding efficiency is improved.

The invention provides a production method of a cold-rolled titanium steel composite plate coil. Industrial production is achieved through the following steps that S1, the titanium steel composite plate coil is selected as a cold-rolled raw material; s2, removing the titanium layer at the head and the tail of the raw material to expose the steel base material, and welding the steel base material with the stainless steel leading tape; s3, a continuous annealing furnace is adopted for annealing the composite plate coil welded in the step S2, shot blasting is carried out after annealing, and acid pickling is carried out after shot blasting; a reversible reciprocating rolling mill is adopted for rolling, a constant rolling force mode is adopted for cold rolling, the accumulative deformation is controlled to be 50%-75%, and the single pass is smaller than or equal to 15%; s5, degreasing the cold-rolled composite plate coil; s6, carrying out multi-step vacuum annealing on the degreased composite plate coil; s7, flattening the composite plate roll subjected to vacuum annealing; and S8, the flattened composite plate coil is pulled and straightened, and the cold-rolled titanium steel composite plate coil is prepared. According to the method, the continuous production of the cold-rolled titanium steel composite plate coil with good performance can be realized by adopting a conventional production line without first-pass heavy reduction or a special powerful rolling mill.

According to the production method of the hot-rolled copper-steel double-metal composite plate, copper is oxygen-free copper, and Cu is larger than or equal to 99.95%; the steel is low-alloy high-strength steel; the key process steps of the copper-steel composite plate comprise assembling, heating, rolling, cooling and finishing. By controlling the rolling temperature, the pass reduction rate, the cooling speed and other processes, the plate shape of the copper-steel rolled composite plate is obviously improved, the stability of the bonding surface is greatly improved, and therefore industrial production and application of the copper-steel bimetal rolled composite plate are achieved.

The embodiment of the invention discloses electronic equipment, a composite board and a preparation method thereof, and relates to the field of board structures. The conductive performance of the composite board is improved. According to the specific scheme, the composite board comprises a composite layer, a carbon fiber yarn layer, a conductive layer and a floor. The composite layer is provided with a groove structure; the carbon fiber yarn layer is embedded in the composite layer, and part of the carbon fiber yarn layer is located in the groove structure. The conductive layer and the composite layer are stacked, and the conductive layer covers at least part of the groove structure and is electrically connected with the carbon fiber yarn layer. One side of the conductive layer away from the composite layer is electrically connected with the floor. And the conductive layer is electrically conducted with the carbon fiber yarn layer. And the carbon fiber yarn layer embedded in the composite layer is electrically connected with the floor through the arrangement of the groove structure and the conductive layer. Therefore, charges in the whole carbon fiber yarn layer can flow to the floor through the conductive layer. And the whole carbon fiber yarn layer has an electromagnetic compatibility protection effect. When the composite board is applied to the electronic equipment, the electromagnetic compatibility protection performance of the electronic equipment can be improved.

The invention relates to the technical field of functional board manufacturing, in particular to a damp-proof and wear-resistant composite board and a laminating process thereof. The composite material is prepared from 40-50 parts of dithiocar-bamate modified epoxy resin, 30-40 parts of nano silicon dioxide-carbon quantum dot modified polyurethane, 5-8 parts of a graphene-silane-metal organic framework compound, 2-4 parts of magnetic field oriented silicon carbide whiskers and 1-3 parts of self-repairing microcapsules. The modified epoxy resin is prepared from epoxy chloropropane and mercapto silane through a reaction, the graphene compound is embedded into the ZIF-8 nanoparticles, and the silicon carbide whiskers are directionally arranged through a 0.5-1T magnetic field during lamination; the plate is of a three-layer structure, covalent bonds are formed among layers through a silane coupling agent, and the plate has moisture-proof, wear-resistant and self-repairing functions. The composite material is low in water absorption rate, high in wear resistance frequency, high in microcrack repairing efficiency, high in interlayer bonding strength, capable of being stably used in high and low temperature environments, efficient in preparation process and suitable for the fields of high-end buildings, electronic equipment and the like, and the moisture-proof grade reaches IP67.

The invention discloses an asymmetric extrusion preparation method for a heterogeneous magnesium alloy composite board with an adjustable layer thickness ratio. The method comprises the steps that an asymmetric extrusion die with an extrusion outlet deviating from the center is designed, and an extrusion deformation section is of a triangular section in the thickness direction and of an isosceles trapezoid section in the width direction; a VK41 magnesium alloy, a ZK61 alloy and pure magnesium are machined into blanks with the thicknesses of A, B and C, the blanks are combined according to the EZP sequence after homogenization treatment, the blanks are heated to 350-400 DEG C, heat preservation is conducted, and the extrusion speed is 1-2 mm / s; extruding by adopting an asymmetric die, and placing pure magnesium on the alpha angle side to obtain a three-layer composite board; and carrying out folding or V-shaped bending test on the processed sample. By regulating and controlling the ratio of A: B: C and the extrusion shrinkage angle, accurately controlling the layer thickness ratio, introducing shear strain to improve the texture, coordinating the tension and compression asymmetry and remarkably improving the bending performance, the process is simple, and the method is suitable for industrial production and is suitable for the fields of aerospace, automobiles and the like.

The invention provides a heat preservation box capable of rapidly replacing a cold source. The heat preservation box comprises a box body and cold storage plates; the box body is provided with a box door, a cold storage area, a control area and a cold source area are arranged in the box body, the cold storage area is separated from the control area and the cold source area through a middle partition board, and the control area and the cold source area are separated through a side partition board; a backflow partition board is arranged in the cold source area, the cold source area is divided into a cold source cavity and a backflow cavity through the backflow partition plate, the cold source cavity communicates with the lower portion of the backflow cavity, a plurality layers of cold sourceframes used for containing the cold storage plates are arranged in the cold source cavity, and the cold source cavity communicates with the cold storage area through an air inlet channel; an exhaustfan is arranged on the air inlet channel, the cold storage area communicates with the backflow cavity through a backflow channel, and an air blower is arranged on the backflow channel; a control module is arranged in the control area, a first temperature sensor is arranged in the cold storage area, the exhaust fan, the air blower, and the first temperature sensor are electrically connected with the control module; and box body, the middle partition plate and the side partition plate are all made of vacuum composite plates. According to the heat preservation box, the replacement efficiency of the cold source is improved.