1036 results about "Internal stress" patented technology

The invention belongs to the technical field of PBT plastic particle injection molding, and particularly relates to a precise injection molding process control system for PBT plastic particles. The control system is composed of the following modules: a material characteristic sensing and modeling module, a multi-physical field simulation and parameter generation module, a distributed optical fiber global sensing module, a predictive closed-loop control module, and a digital twinning and full-period optimization module. The material characteristic sensing and modeling module is used for acquiring microscopic parameters of PBT raw materials through a near infrared spectrum sensor and constructing a material characteristic dynamic model; raw material characteristic fluctuation is pre-judged through near infrared spectrum dynamic modeling, technological parameter drift is predicted in advance in combination with an LSTM neural network, and feed-forward compensation is started before deviation is formed; compared with post correction in the prior art, the mechanism has the advantages that the parameter fluctuation control precision is improved, and the prevention efficiency for the problems of hydrolytic degradation, internal stress concentration and the like which are prone to occurring in PBT is improved.

The application relates to the field of building technology, in particular to a post-tensioned prestressed seamless concrete floor construction method. In the construction preparation step, a strain sensing sensor is arranged, and a steel strand with a protective sleeve is arranged; in the concrete pouring step, concrete with good early strength is adopted; in the prestressed tensioning step, the stress and tension are monitored through a preset sensor, the strain value when the floor first cracks is determined, the initial value for starting the tensioning device is determined, and the tensioning device is controlled to start tensioning operation. Subsequent control is realized through a control system according to the information monitored by the sensor and the instruction control, and the preset threshold value is preferably less than the initial value for starting the tensioning device, so that the tensioning is started before the internal stress of the concrete is insufficient to cause cracks, and the tensioning process is effectively controlled before the cracks are generated, so that the floor is ensured not to generate cracks.

The invention discloses a straight bar splicing type stator core for a frameless torque motor, and relates to the field of stator cores, the straight bar splicing type stator core comprises a stator core body, the initial state of the stator core body is a straight bar shape, stator core split bodies are arranged in a straight line, the inner side projection of the stator core body is provided with a stator core tooth part, and the inner side projection of the stator core body is provided with a stator core tooth part. Coils are sequentially wound on the tooth parts of the stator core, and after the coils are wound, the stator core body is subjected to integral circle surrounding welding. According to the straight bar splicing type stator iron core for the frameless torque motor, the stator iron core body adopts a straight bar type design, the split structures of the stator iron core body are arranged in a straight line, and the connection part of each split body is provided with a process hole which is specially used for eliminating internal stress generated in the manufacturing and operation processes, so that the production process is simplified, the production efficiency is improved, and the production cost is reduced. And the uniformity and the stability of the iron core are ensured, the stress concentration is effectively reduced, the production speed and the production efficiency are improved, meanwhile, the manual intervention requirement is reduced, and large-scale manufacturing is facilitated.

The invention discloses a multispectral image and LiDAR fusion method suitable for dam body deformation monitoring, and belongs to the field of hydraulic engineering safety monitoring. According to the method, a dam body surface multispectral image and three-dimensional point cloud data are obtained through an unmanned aerial vehicle, and crack spectral features and structural joint geometric features are extracted after processing; constructing a CNN and finite element coupling model, inputting the surface displacement field after feature fusion into the finite element model, and simulating internal stress-strain distribution in combination with material parameters; and analyzing the space-time correlation between the surface displacement and the internal stress, optimizing parameters by combining measured data, and outputting a deformation correlation result. According to the invention, all-directional correlation monitoring of the surface and internal deformation of the dam body is realized, the limitation of a single data source is overcome, the monitoring precision and reliability are improved, and support is provided for safety assessment of the dam body.

The invention relates to a mechanical metamaterial structure based on a six-rod and six-cable tensegrity structure, and belongs to the field of mechanical metamaterials, the mechanical metamaterial structure comprises a six-rod and six-cable tensegrity cell structure, and the tensegrity cell structure comprises corner assemblies, first connecting shafts, fixing rings and middle tensegrity assemblies; under the action of the middle tensioning assembly, when the structure is not subjected to an external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; under the state of being subjected to an external load, the structure can generate self-adaptive deformation; and the external load is removed again, and the structure can recover to the initial state. The mechanical metamaterial structure based on the six-rod six-cable tensegrity structure has the advantages of adaptivity, isotropy, negative Poisson's ratio and the like, the tensegrity structure and the mechanical metamaterial structure are combined, and the types of existing mechanical metamaterial cell element structures are enriched; and a brand new direction is opened up for the design, analysis and application of the tensioning mechanical metamaterial structure.

The invention discloses an ejector pin anti-fatigue strengthening method based on multi-section variable-temperature treatment, and relates to the technical field of ejector pin anti-fatigue strengthening, and the ejector pin anti-fatigue strengthening method comprises the following steps: austenitizing high-temperature quenching: heating an ejector pin to an austenitizing temperature, and then carrying out zoned cooling on the ejector pin; medium-temperature tempering and thermal-state mechanical strengthening are conducted, specifically, the ejector pin is tempered at the medium-temperature tempering temperature, and thermal-state shot blasting or laser shock is conducted on the ejector pin in the heat preservation period or after heat preservation is completed; intermediate low-temperature plasma nitriding: carrying out plasma nitriding in a nitrogen-hydrogen gas environment; subzero treatment: placing the ejector pin in liquid nitrogen; and finally, low-temperature tempering and cold-state mechanical strengthening are conducted. Through multi-section temperature gradient treatment, phase change distribution control over different temperature sections is achieved, too high internal stress and brittleness generated by one-time quenching are avoided, sudden size change and hot cracks induced by phase change are prevented, a controllable surface-core hardness and toughness gradient is formed, the surface crack initiation tendency is reduced, and the surface quality is improved. And the consistency and controllability of anti-fatigue basic conditions are improved.

The application relates to the technical field of metal casting, and discloses a directional solidification casting equipment for low-internal-stress aluminum alloy complex structures, which comprises a heat preservation furnace, a rotary casting assembly, an infiltration temperature control assembly and a forming die. The casting equipment is provided with the rotary casting assembly and the forming die on a rotary table, the rotary table rotates at different rotating speeds to provide controllable centrifugal force, metal liquid is infiltrated and cast on the forming die in the anti-gravity mode under the action of the centrifugal force, the infiltration speed and pressure can be adjusted by changing the centrifugal force, the limitation of workpiece size in negative pressure casting is broken, and the anti-gravity casting of complex structure workpieces is facilitated, the equipment can simultaneously synchronously cast multiple molds, each process parameter is convenient to uniformly control, the quality consistency is ensured, the problem that continuous carbon fiber reinforced aluminum matrix composite materials are difficult to mass produce is solved, and the production efficiency is improved.

The invention relates to the technical field of material science, and discloses a slurry valve erosion-resistant multi-layer coating with gradient function design and a preparation method thereof.The coating comprises a bonding layer, a gradient function layer and an erosion-resistant surface layer which are sequentially arranged from inside to outside, the bonding layer is composed of nickel-based alloy or cobalt-based alloy, the thickness of the bonding layer is 50-100 micrometers, and the thickness of the gradient function layer is 50-100 micrometers. The gradient functional layer is made of composite powder of metal and ceramic, the metal is nickel or cobalt, the ceramic is tungsten carbide or chromium carbide, and the components of the gradient functional layer are from the bonding layer side to the erosion-resistant surface layer side; the bonding layer is arranged and forms firm metallurgical bonding with the matrix, the interface stress is reduced, the basic reliability of bonding of the coating and the matrix is guaranteed, meanwhile, the gradient functional layer with the metal and ceramic volume fraction gradually changing continuously is adopted, the problem that the thermal expansion coefficients of the coating and the matrix are not matched is solved, and the service life of the coating is prolonged. And the crack initiation and expansion risk caused by internal stress concentration is reduced, so that the long-term stability of the coating structure is ensured.

The invention discloses a high-toughness PPR pipe machining device which comprises an extrusion system, a pulsation mixing system, a melt online monitoring device, a sizing cooling system, a traction device and a winding device. The extrusion system is used for melting and conveying raw materials, and the pulsation mixing system is used for deeply mixing a melt by utilizing a periodic disturbance structure, so that a toughening agent and a copolymerization component are more uniformly dispersed in the melt. The melt on-line monitoring device can detect the temperature, pressure and dispersity of the melt in real time, so that the extrusion process is monitorable. The sizing cooling system adopts a subsection cooling mode of rapid cooling, constant-temperature slow release and low-temperature shaping, and stable shape control is achieved through vacuum sizing. The traction device and the winding device are used for keeping the production rhythm stable and achieving continuous winding of the formed pipe. According to the invention, the melt mixing quality can be improved, the cooling internal stress is reduced, and the toughness and dimensional stability of the PPR pipe are improved.

The invention relates to the technical field of brick compression molding, in particular to a sliding plate brick compression molding device and a compression molding method thereof.The device comprises a gantry rack, a hydraulic column ascending and descending in the gantry rack, a switching box device connected with the bottom end of the hydraulic column, an impact die connected with the bottom end of the switching box device and a discharging die arranged below the impact die; compared with the situation that in traditional sliding plate brick pressing production, a mold continuously and rigidly impacts brick raw materials, the internal stress of the raw materials is uneven, and the pressure resistance of the produced sliding plate brick is reduced, the impact mold continuously impacts the brick raw materials, the initial impact mold is subjected to strong flexible thrust which is gradually converted into weak flexible thrust, and therefore the pressure resistance of the sliding plate brick is improved. The internal stress of the brick raw materials is effectively eliminated, finally, the brick raw materials are accurately shaped through impact of rigid thrust, and after machining is finished, the impact die is automatically switched from rigidity to flexibility again under thrust, and preparation is made for next sliding plate brick production.

The invention relates to the technical field of package detection, and discloses a non-abandoned wine product package box compression resistance detection method and system based on a sensor. According to the method, surface pressure distribution data and internal stress waveforms of a packaging box are collected through a sensor network, and a multi-modal sensing data flow is generated. A three-dimensional digital twinning model of the packaging box is constructed based on the data flow, and material elastic parameters and structural constraint conditions are initialized; and carrying out compression resistance prediction training on the model to generate an adaptive compression resistance prediction model, and outputting a deformation simulation sequence in a virtual pressure environment. Real-time sensor data and a simulation sequence are dynamically compared to calculate a deformation error coefficient, so that a trigger threshold value of a pressure detection device is adjusted, and a compression resistance detection cycle is started. Multi-source data are fused in the circulation process for spatio-temporal feature analysis, and the overall compressive strength of the packaging box is evaluated. According to the invention, accurate prediction and dynamic detection of the compression resistance of the packaging box are realized.

Provided are methods and structures for keeping the integrity of layers deposited on a semiconductor wafer through a thermal cycle. Deposition of a second backside layer, or a cap, with an internal stress opposite to a first backside layer may be used to reduce bow shift of a wafer during a thermal cycle. The first backside layer may have a tensile internal stress or a compressive internal stress. The second backside layer has an internal stress opposite to the first backside layer. Each of the backside layers may be deposited by a backside deposition apparatus.

The invention discloses an impacting-splitting-cutting composite rock breaking configuration of a cantilever type heading machine, relates to the field of coal mine underground heading equipment, and solves the problems of low efficiency, serious cutting pick abrasion, poor stability and insufficient adaptability of an existing heading machine during hard rock operation. A multi-stage cylinder executing mechanism is arranged on a cutting arm of the heading machine, an angle adjusting rotary table is arranged at the upper end of the multi-stage cylinder executing mechanism, and a breaking hammer and a rock cracking machine are arranged on the angle adjusting rotary table; the angle adjusting rotary table comprises a track plate and a rotary table, and the rotary table drives the track plate to rotate; a breaking hammer is arranged at one end of the track plate, and a rock cracking machine is arranged at the other end. The breaking hammer and the rock cracking machine are integrated at the front end of the heading machine, pre-broken rock can be split, the number of times of breaking is reduced, vibration and noise caused by repeated breaking are avoided, the internal stress of a rock stratum is damaged by additionally arranging the rock cracking machine, other work of the whole machine is not affected, and the service life of the heading machine is not affected.

The invention provides an intelligent temperature control method and system for relieving stress of a glass annealing kiln. The method comprises the following steps: transmitting acoustic surface waves through a distributed sonic sensor to collect stress propagation data in glass, decoupling coupling characteristics of sound velocity and temperature, extracting a relaxation time constant, and generating a stress relaxation rate; performing time difference cross-correlation analysis to construct a stress propagation three-dimensional gradient field, establishing an incidence relation between the relaxation rate and the gradient field, and constructing a mapping strategy of the temperature set value and the relaxation rate according to the incidence relation; generating a dynamic temperature adjusting parameter and converting the dynamic temperature adjusting parameter into a heater power control signal; and dynamically adjusting a stress data feature extraction rule to match a real-time stress state according to the relevance between the gradient field update frequency and the temperature adjustment rate. According to the application, dynamic mutual optimization of the annealing stress elimination efficiency and the kiln temperature setting precision is realized, the glass residual stress is reduced, and the hidden danger of plate explosion is eliminated.

The invention belongs to the technical field of hard alloy surface engineering, and particularly relates to an MT-TiCN gradient coating of a hard alloy cutter and a preparation method of the MT-TiCN gradient coating. The coating sequentially comprises a TiN bottom layer, an MT-TiCN gradient layer, a transition layer and an Al2O3 layer from inside to outside, wherein the C / N atomic proportion of the MT-TiCN gradient layer is in gradient distribution from rich N to rich C in the thickness direction. The coating is prepared through a medium-temperature chemical vapor deposition process, the internal stress of the coating is effectively relieved, and the bonding strength, toughness and wear resistance of the coating and a matrix are remarkably improved.

The invention relates to a composite current collector and a lithium battery. The composite current collector comprises a metal layer, a supporting layer and an adjusting layer arranged between the metal layer and the supporting layer, the adjusting layer comprises matrix resin, and the glass transition temperature Tg of the matrix resin is less than or equal to 70 DEG C, so that the adjusting layer has excellent flexibility and deformability, can effectively absorb and buffer internal stress generated by thermal expansion coefficient difference of metal and polymer, and prevents interface stripping caused by stress concentration, thereby greatly improving the durability of the binding force. By limiting the number of carbon atoms of a molecular main chain in a range of 12-700, the flexibility and cohesion strength of the adjustment layer can be balanced, so that stress can be buffered, the adjustment layer can serve as a firm whole, the binding force of the metal layer and the polymer layer is further improved, interface separation is avoided, the cycle life of the lithium battery is prolonged, and the use safety of the lithium battery is improved.

The invention relates to clamping equipment for a workpiece with a cambered surface, belongs to the technical field of accessories of machine tools, and solves one of the problems that in the prior art, the workpiece with the cambered surface is difficult to clamp and position during machining, the internal stress generated by machining is large, the workpiece is easy to deform, and the supporting adaptability is low. The clamping equipment comprises a positioning locking module and an auxiliary supporting module. The positioning and locking module is used for positioning and locking a workpiece through a clamping element; the auxiliary supporting module comprises a plurality of supporting blocks which are arranged at intervals and can independently and universally rotate, when the supporting blocks are located at the working positions, the top faces of all the supporting blocks are located on the same arc face, and the diameter of the arc face is equal to that of the arc face of the workpiece. The positioning and locking module is adopted for positioning and supporting the workpiece with the cambered surface, the auxiliary supporting module is used for achieving auxiliary floating supporting on the peripheral face of the workpiece with the cambered surface, and internal stress and deformation generated during machining can be reduced.

The invention provides a real-time data driving-based mortar microstructure regulation and control method, which comprises the following steps of: acquiring flow state data of a mortar material in real time in a construction process through a sensor network, recording internal stress distribution and a particle movement track of the material, and generating an initial flow state data set; if the structure distribution data set does not reach the target threshold value, dynamically adjusting the external intervention intensity through a feedback control module, recalculating vibration or electromagnetic guide parameters in combination with real-time monitoring data, and generating an improved intervention strategy; and for the improved intervention strategy or the material reaching the target threshold value, continuously monitoring the mechanical property index after molding, recording related data of crack resistance and flexibility improvement, and generating a comprehensive performance evaluation result.

The invention discloses a flexible composite pipe safety state monitoring method, device and system, and the method comprises the steps: predicting the current condition of a to-be-detected pipeline through obtaining historical monitoring data, obtaining a prediction state vector, then building a coupling observation function to determine a Kalman gain, determining whether a predicted value is believed or not based on the Kalman gain, and after the believed predicted value is determined, carrying out the monitoring of the safety state of the to-be-detected pipeline. Correcting the predicted value based on Kalman gain to obtain a corrected target state vector, then determining a soil state mark based on the target state vector so as to determine the current maximum internal stress of the to-be-detected pipeline, and determining a pipeline state risk level in combination with a function that the allowable stress of the material changes along with the temperature. Finally, the leakage identification result, the leakage position and the leakage severity are determined through the signal leakage identification model, automatic monitoring of the safety state of the buried flexible composite pipe is achieved, and meanwhile the safety monitoring accuracy of the buried flexible composite pipe is improved.

The invention discloses an FMM preparation method and material processing equipment, and relates to the field of semiconductor processing, and the method comprises the steps: carrying out the pretreatment of a strip-shaped metal substrate, removing the surface impurities of the strip-shaped metal substrate, and improving the flatness of the strip-shaped metal substrate; the two sides of the metal base material are thinned, and the thinning amount of the first surface of the metal base material is smaller than that of the second surface of the metal base material; and forming a plurality of evaporation holes penetrating through the first surface and the second surface on the metal substrate, wherein the evaporation holes are gradually expanded from the first surface to the second surface. According to the preparation method of the FMM, the internal stress in the material can be balanced in the metal base material thinning process, and the FMM is not prone to deformation in the preparation process or the evaporation process.

The invention relates to the technical field of electronic component manufacturing, solves the technical problem that interface contact resistance bounces and rises due to thermal stress mismatch, and particularly relates to an electronic component preparation parameter optimization method and system. Generating a gradient layer of which the thermal expansion coefficient continuously changes; and calculating a target thermal expansion coefficient for eliminating the interface thermal stress and an actual thermal expansion coefficient of the in-situ monitoring gradient layer based on the metal and ceramic concentration distribution function. According to the method, component continuous transition is achieved through metal / ceramic precursor dynamic flow control, continuous gradual change from metal to ceramic components is achieved, the coefficient of thermal expansion is in smooth transition in the thickness direction, and internal stress accumulation caused by material expansion difference is blocked from the source; and dynamic deposition regulation is combined to ensure that the thermal expansion gradient at any position is lower than a critical threshold value, and stripping or cracking caused by stress concentration in thermal circulation is avoided.

The invention relates to the technical field of polymer optical materials, in particular to an optical-grade polymethyl methacrylate material and a preparation method thereof, and the optical-grade polymethyl methacrylate material comprises the following raw materials in parts by weight: 95-105 parts of methyl methacrylate, 200-240 parts of a composite liquid medium, 1.5-2.5 parts of a composite additive and 0.08-0.12 part of an initiator. According to the invention, the composite additive is used as a main material and the composite liquid medium is used as an auxiliary material, so that the heat resistance and the size stability of the material are synergistically improved, powder in the composite additive is uniformly dispersed in a methyl methacrylate matrix to form a compact physical support skeleton, and the powder is matched with a treating agent and a methyl methacrylate molecular chain to form strong chemical bond combination; the composite liquid medium optimizes the flowability of a polymerization system, reduces polymerization internal stress residues, avoids material deformation caused by internal stress release at high temperature, and enhances high-temperature stability.

The disclosure concerns a 3D printhead, a radiation emission device, and processes for additive fabrication and extrusion. The printhead comprises a radiating plate configured to transmit a thermal energy to the printing material deposited on a surface. A radiation emission device may be attached to an additive fabrication or extrusion device and comprising a radiating plate and a heating element. Additive fabrication and extrusion processes using a radiation for heating a surface for deposition of the material. Characteristics of products thus produced, such as porosity rate, warping, isotropy, maximum stress, internal stress, impact resistance, bending resistance, deformation at break, rigidity modulus, crystallinity rate, and impermeability are improved.

The invention discloses a forming method of a composite material flange and a mold thereof in the technical field of aviation structure connecting piece manufacturing. The forming method comprises the steps of mold pretreatment, layered paving design, twisted wire core material preparation and soft mold auxiliary forming. Fiber arrangement is optimized through gradient paving of the R area and spaced arrangement of the flexible gaskets, and the structural stability is ensured in combination with tooth groove lockrand packaging. A stepped heat-seal pressing curing process is adopted, and synchronous compaction of an R area and a plane area is achieved in cooperation with air bag pressurization. The process comprises core material filling verification, vacuum preloading and temperature control demolding, and finally the high-precision flange component is obtained. According to the method, the problems of poor fiber attachment, non-uniform pressure and stress concentration of the R area of the composite material flange are effectively solved through a synergistic process of progressive pre-compaction and stepped heat-sealing pressing curing, so that continuous arrangement of complex curved surface fibers is realized, the internal stress of an interface is remarkably reduced, and finally, a high-quality flange component with a compact structure and uniform performance is obtained.

The invention provides a composite material for forming a stress release layer, a preparation method of the composite material, an integrated co-fired piezoelectric ceramic actuator and a preparation method of the integrated co-fired piezoelectric ceramic actuator. The method for preparing the composite material for forming the stress release layer comprises the following steps: carrying out ball milling treatment on Bi2O3, Fe2O3, Pb3O4 and TiO2 to obtain precursor powder; the precursor powder is subjected to heat treatment, and BiFeO3-PbTiO3 ceramic powder is obtained; and mixing the BiFeO3-PbTiO3 ceramic powder with the inner electrode metal slurry to obtain the composite material. The internal stress of the actuator is effectively regulated and controlled by utilizing the negative thermal expansion characteristic of the BF-PT ceramic. The elasticity of the inner electrode metal ensures the stress slow-release capability of the inner electrode metal and the outer electrode metal serving as a composite material of a stress release layer, and meanwhile, an effective water vapor barrier is constructed due to the high density of the inner electrode metal.

The invention discloses a gradient vulcanization preparation method of a rubber sealing strip for an automobile, and relates to the technical field of automobile part manufacturing. The multi-layer structure blank comprises a functional outer layer, a first composite layer of a high-melting-point phase change material and an electrogenerated shape memory polymer, a second composite layer of a low-melting-point phase change material and a thermogenerated shape memory polymer, a core layer containing an induction medium and a functional inner layer. Through step-by-step control of core layer pilot vulcanization and outer layer synergistic vulcanization and in combination with directional infrared energy supplementation, the contradiction between insufficient corner vulcanization and overheating degradation of the core layer is solved, and the overall vulcanization uniformity of the product is ensured. By means of the synergistic effect of the shape memory polymer and the phase change material, gradient pulse cooling and post-treatment shaping are matched, vulcanization internal stress is effectively released, the product straightness and size stability are remarkably improved, and the deformation risk is reduced.

The invention relates to the technical field of metal material heat treatment, in particular to a metal lock body toughness strengthening heat treatment process, a metal lock body is low-carbon steel or medium-carbon steel, the carbon content is 0.12%-0.45%, and the metal lock body toughness strengthening heat treatment process comprises the steps that surface cleaning and stress pretreatment are sequentially conducted on the metal lock body; the treated metal lock body is placed in a heat treatment furnace, and segmented heating is conducted to the austenitizing temperature according to a preset heating curve; first-stage heat preservation is conducted in the austenitizing temperature interval, and then cooling is conducted to the bainite transformation temperature interval for second-stage heat preservation; after double-temperature-area heat preservation is completed, stepped cooling treatment is conducted on the metal lock body; and the cooled metal lock body is sequentially subjected to low-temperature tempering, shot blasting treatment and secondary tempering. Through surface cleaning, stress treatment, segmented heating, double-temperature-zone heat preservation, stepped cooling, low-temperature tempering, graded shot blasting and secondary tempering, lock body stress is fully released, structure defects are reduced, internal stress is slowly released, and toughness, strength and performance stability are improved.

The application belongs to the field of medical biological materials, and relates to a preparation method of a hierarchical nanofiber composite film for nerve repair and application thereof. The method comprises the following steps: preparing multilayer nanofibers with different internal stresses through continuous multiple electrostatic spinning units, stacking the multilayer nanofibers with different internal stresses to form a composite nanofiber film with an internal stress gradient; chemically crosslinking the composite nanofiber film; performing adhesion molecule adhesion treatment on the upper surface of the composite nanofiber film; and preparing the hierarchical nanofiber composite film with an internal stress gradient and capable of self-deforming under the action of liquid to wrap nerves. The film provided by the application has excellent flexibility, biocompatibility and degradation performance, can efficiently and quickly adhere to the surface of damaged nerves, provides a good support microenvironment for nerve cell growth, promotes nerve regeneration and repair, and has a wide application prospect in the field of peripheral nerve injury repair.

The application discloses a kind of synergistically modified decorative functional composite board and preparation method thereof.The board is all inorganic system, by substrate layer, inorganic hydrophilic expansion stress compensation layer, inorganic modulus transition layer and photocatalytic functional surface layer superposition.The compensation layer can produce reversible expansion with humidity, offset the shrinkage internal stress of board;Transition layer matches the mechanical properties of each layer, improves structural stability.The application can effectively prevent board warping, cracking and delamination, has air purification function, and there is no problem of organic component being photocatalytically oxidized, simple process, easy industrialization.

The invention relates to a preparation method of a high-quality EB evaporation target, and relates to the field of target preparation, and the preparation method comprises the following steps: loading a powder raw material into a cleaned crucible, and pre-compacting to obtain a pre-compacted crucible; putting the pre-compacted crucible into spark plasma sintering equipment, vacuumizing and pressurizing, starting auxiliary heating to raise the temperature to a thermal shock buffer temperature, stopping auxiliary heating, introducing current to raise the temperature to a sintering densification temperature, preserving heat, stopping introducing current, starting auxiliary heating to carry out speed-controlled cooling, and cooling to a stress safety cooling threshold value, so as to obtain the high-temperature-resistant and high-pressure-resistant crucible. And transferring into a program control cooling system for cooling, removing the crucible, cleaning and drying to obtain the high-quality EB evaporation target material. The prepared target material has high density and mechanical strength, internal stress is relieved, good evaporation stability and film layer uniformity are shown in the electron beam physical vapor deposition process, and the finally obtained coating is compact in structure and has high hardness and high adhesive force.