20 results about "Functionally gradient material" patented technology

The invention discloses a quality detection method in a functionally graded material preparation process, and relates to the technical field of functionally graded materials.The quality detection method comprises the following steps that the temperature of a green body in the functionally graded material preparation process is collected, and green body temperature distribution data is obtained; performing real-time thickness measurement on the green body according to the green body temperature distribution data to obtain a green body thickness change curve; identifying an abnormal fluctuation section in the thickness change curve of the green body, and carrying out phase detection on a physical region with the abnormal fluctuation section of the green body to obtain regional phase composition data; performing internal defect scanning on the green body according to the regional phase composition data to obtain an internal defect map of the green body; performing quality evaluation on the green body based on the green body internal defect map to obtain a quality grade judgment result; according to the method, the ultrasonic flaw detection scanning range is guided based on the phase abnormal region, and high-resolution internal flaw detection can be performed on the high-risk region of the functionally graded material in a targeted manner.

The invention relates to the field of material thermal expansion testing, and provides a thermal expansion measuring device and method for gradient materials, and the device comprises an array probe module, a machine vision system, a temperature control system, a driving mechanism, a control module and a housing. The probe array module comprises probes arranged at equal intervals, and the bottom ends of the probes are in direct contact with the surface of a sample; the driving mechanism drives the probe array to scan along a sample component gradient direction; the machine vision system is used for collecting a probe top end image and combining an image processing algorithm to achieve full-area analysis of gradient components. Compared with existing equipment, the thermal expansion behavior of samples such as component gradient materials and composite materials can be represented, the thermal expansion behavior characterization device is particularly suitable for thermal expansion behavior characterization of key components such as aerospace gradient coatings and nuclear reactor cladding materials, and a reliable testing means is provided for design optimization of functionally gradient materials.

This invention relates to the field of functionally graded materials, specifically to a multidimensional gradient composite material structure and its design method for high-speed impact loading. The composite material structure includes a main body composed of multiple material gradients, a function-controlled outer edge slope, and a bottom high-density layer. By adjusting the side pressure distribution and enhancing the central pressure through the high-density layer, the deformation of the homogeneous material under high-speed loading is effectively reduced, with a maximum deformation ≤0.06mm, and the launch velocity is increased, with a central final velocity ≥13km / s. This invention is applicable to three-stage lightweight gas gun loading technology, providing high-precision data support for protective material research in aerospace and planetary science fields.

The invention discloses a method for calculating the inherent frequency of a porous two-dimensional functionally graded material framework, and belongs to the technical field of structural design, the framework is simplified into a beam model with two clamped ends, a motion control equation of a porous two-dimensional functionally graded material beam in a humid and hot environment is deduced through a Hamilton principle based on a Timoshenko beam theory, and the inherent frequency of the porous two-dimensional functionally graded material beam is calculated. Simplifying the equation by using a variable separation method; the inherent frequency of the beam is solved by adopting a differential quadrature method; a motion control equation is discretized by utilizing a differential quadrature method discretization principle, then the equation is converted into a matrix form, the problem of solving the motion equation is converted into the problem of solving a matrix eigenvalue by adopting a matrix transformation method, and finally solving is carried out by writing a corresponding program. The corresponding solving program is clear in logic and high in uniformity, the calculation efficiency and precision are greatly improved, and a theoretical reference can be provided for the design of the functional gradient skeleton in the later period.

The invention provides a pump impeller and a preparation method thereof, and belongs to the technical field of fluid machinery. The method comprises the steps that based on impeller operation conditions, stress concentration and corrosion and cavitation erosion high-risk areas of the impeller are identified through simulation analysis; designing a functionally graded material layer in the region in the impeller three-dimensional model; a laser additive manufacturing process is adopted, the proportion of various raw materials is adjusted in real time, and an impeller blank with continuous gradient change of components, structures and performance is manufactured through layer-by-layer cladding; and finally carrying out post-treatment processing. Precise reinforcement of the key area of the impeller is achieved, the fatigue resistance, corrosion resistance and cavitation erosion resistance of the impeller are remarkably improved, meanwhile, the problem that the cost is too high due to the fact that high-performance materials are integrally used is solved, and reliability, durability and economical efficiency are considered.

The present application relates to a method and system for additive manufacturing of continuous gradient materials with nonlinear composition transitions, which can solve the problem that traditional functional gradient materials with linear composition changes are prone to brittle phases and insufficient performance in composition-sensitive intervals. The method includes: determining the gradient step size according to the part size, and calculating the composition change rate of each layer based on the printing layer thickness and height; preparing full-composition functional gradient materials by linear transition, and identifying the brittle phase generation interval in combination with microstructure characterization methods; designing a nonlinear composition transition method for sensitive intervals to suppress element segregation and brittle phase generation, and optimize interface bonding strength and comprehensive performance. The composition of the gradient material prepared by this application is continuously controllable in any direction, and there is no sudden interface in the composition distribution. The strength, high-temperature oxidation resistance and thermal fatigue life are significantly better than those of traditional linear gradient materials, and it is suitable for high-performance demand scenarios such as aerospace, nuclear energy heat dissipation and biological implants.

The application discloses a quality detection method in a functional gradient material preparation process, and relates to the technical field of functional gradient materials, and comprises the following steps: collecting the temperature of a blank body in the functional gradient material preparation process to obtain blank body temperature distribution data; performing real-time thickness measurement on the blank body according to the blank body temperature distribution data to obtain a blank body thickness change curve; identifying an abnormal fluctuation section in the blank body thickness change curve, performing phase detection on a physical region where the blank body exists the abnormal fluctuation section to obtain regional phase composition data; performing internal defect scanning on the blank body according to the regional phase composition data to obtain a blank body internal defect atlas; and performing quality evaluation on the blank body based on the blank body internal defect atlas to obtain a quality grade judgment result; the application realizes the guidance of the ultrasonic flaw detection scanning range based on the phase abnormal region, and can perform high-resolution internal defect detection on the high-risk region of the functional gradient material in a targeted manner.

The present invention relates to the technical field of functional gradient materials, and in particular to a method for preparing functional gradient materials. An embodiment of the present invention provides a method for preparing functional gradient materials, comprising: preparing metal particles of different particle sizes by adjusting the rotation speed of the rotating electrode in the plasma rotating electrode process; mixing the metal particles of different particle sizes with different amounts of ceramic powder to obtain multiple groups of mixed particles; wherein, in the multiple groups of mixed particles, the finer the particle size of the metal particles, the higher the proportion of the ceramic powder; performing a first hot pressing and sintering treatment on each group of the mixed particles to obtain multiple hot pressed layered bodies; stacking the multiple hot pressed layered bodies in the order of the ceramic content along the thickness direction, and performing a second hot pressing and sintering treatment to obtain the functional gradient material. An embodiment of the present invention provides a method for preparing a functional gradient material, which can provide a functional gradient material that takes into account both hardness and toughness.

The application discloses a functional gradient material and a preparation method and application thereof. The functional gradient material comprises, in sequence, a martensitic stainless steel base material layer, a transition layer, a nickel-based alloy layer, a composite gradient layer and a maraging steel layer. The transition layer is made of nickel-based alloy and austenitic stainless steel; the composite gradient layer is made of nickel-based alloy and maraging steel; and the microhardness of the martensitic stainless steel base material layer, the transition layer and the nickel-based alloy layer satisfies the following relationship: martensitic stainless steel base material layer < transition layer < nickel-based alloy layer; in the composite gradient layer, at least two sublayers with different compositions are included; and from the nickel-based alloy layer to the maraging steel layer, the mass percentage of nickel-based alloy in each layer decreases by 20-40 wt% in turn. The functional gradient material effectively solves the problem of interface hardness mutation during deposition of the maraging steel, and makes the material have excellent yield strength, elongation and wear resistance.

The functionally gradient material can be produced by integral casting using one mold irrespective of the kinds of the resin compositions different from each other.SOLUTION: The functionally gradient material (1') in which a plurality of resin compositions (11', 12') different from each other are joined is manufactured by including a step of casting the next resin composition (12') after the resin composition (11') previously cast into a mold reaches a predetermined viscosity.SELECTED DRAWING: Figure 1

The application relates to an additive manufacturing device for realizing functionally gradient material mixing and recycling, belonging to the technical field of additive manufacturing, which is provided with a powder electrostatic real-time proportioning device in a forming chamber, a material forming device in the forming chamber, and a powder recycling device on the lower side of the forming chamber; a forming table is fixed on the lower side of the forming chamber, a forming pool is arranged on the forming table, a powder containing pool is arranged on the forming table, the powder containing pool is communicated with the powder recycling device; a powder pushing device is arranged on the forming table; a lifting plate is arranged in the forming pool; the powder electrostatic real-time proportioning device is used for uniformly mixing powder and then feeding the powder onto the forming table; a control center is arranged on the forming chamber and is used for controlling the powder electrostatic real-time proportioning device, the material forming device and the powder recycling device to work. The powder recycling device can separate and recycle materials with different densities, so that the powder recycling rate is improved, and the environmental protection effect of powder utilization is improved.

The application discloses a floating pontoon type platform based on intelligent materials and a structure self-recovery method thereof, the platform adopts an isosceles triangular floating pontoon type structure, and the method comprises the following steps: S1, collecting platform structure real-time response data; S2, constructing a response driving type posture offset function; S3, obtaining an excitation temperature rise condition required by a shape memory alloy execution unit for executing recovery changes; S4, calculating platform structure offset recovery stress; and S5, recovering the platform structure and detecting the recovered platform structure in real time. Through the setting of the shape memory alloy execution unit and the functional gradient material, the response amount corresponding to the floating pontoon type platform is taken as input data, a closed-loop control method from platform structure offset risk identification to self-recovery is constructed, offset data can be obtained in real time, offset structure self-recovery can be performed, periodical manual inspection is not needed, the platform structure offset trend can be monitored in real time, and the problems of lacking automatic monitoring and dynamic adjustment mechanisms are effectively solved.

The present invention relates to the field of time-varying reliability technology, and in particular to a method and system for analyzing the time-varying reliability of a functionally gradient material cylinder. The method comprises: defining random variables, random processes, and a time domain for the functionally gradient material cylinder; discretizing the random processes and time domain to obtain a number of time nodes, as well as an instantaneous functional function and independent random variables at each time node; performing dimensionality reduction processing on the instantaneous functional function based on a single-variable dimensionality reduction method, and calculating the statistical moments of the instantaneous functional function; calculating the probability density function of the instantaneous functional function based on the statistical moments, and then calculating the instantaneous failure probability; and jointly combining the instantaneous failure probabilities of all time nodes to obtain a failure probability curve, thereby completing the time-varying reliability analysis of the functionally gradient material cylinder. The present invention combines random process discretization with single-variable dimensionality reduction to calculate failure probabilities, achieving high efficiency and accuracy.

The invention belongs to the technical field of heat transfer characteristic analysis of functional gradient hollow cylinders, and discloses a method for analyzing heat transfer characteristics of functional gradient hollow cylinders under the action of high temperature, which comprises the following steps: S1, acquiring parameters of hollow cylinders, including the inner diameter, the outer diameter, the application temperature, the material density of the outer surface, the specific heat capacity and the heat conductivity; s2, establishing expressions of density, specific heat capacity and heat conductivity of the hollow cylinder material; s3, establishing a heat conduction model and an energy conservation model to obtain a heat conduction control model and an energy conservation control model; s4, based on the heat conduction control model and the energy conservation control model, obtaining a temperature model containing non-uniform parameters, thermal hysteresis time and relative temperature change, and analyzing the influence of the temperature model on the temperature; based on the non-Fourier heat conduction model, the heat conduction behavior of the functionally gradient hollow cylinder is researched, and a theoretical basis and a parameter basis are provided for safety design of a functionally gradient material under a high-temperature load condition.

The invention relates to the technical field of fluid machinery, and discloses a lightweight cross-scale double-low-temperature inspirator which comprises a disc-shaped upper liquid collecting disc and a butterfly-shaped lower liquid collecting device, and four cavities of the upper liquid collecting disc correspondingly communicate with four annular cavities of the lower liquid collecting device; each annular cavity of the lower liquid collector is provided with two groups of annularly arranged nozzles, and the nozzles are perpendicular to the surfaces of the annular cavities where the nozzles are located. The invention further provides a 3D printing method of the injector, firstly, multi-scale three-dimensional modeling is carried out and divided into a macroscopic structure layer and a microcosmic feature layer, then layered printing is carried out, and when interface transition areas of different materials are printed, integrated forming of the multifunctional gradient material is achieved through material alternate deposition. According to the injector, low-temperature sufficient gasification and efficient combustion of fuel are guaranteed structurally, the cross-scale 3D printing technology adopted in manufacturing supports integrated forming of a complex internal flow channel and a functional structure, and the hydrodynamic performance and the combustion efficiency are further improved.

The present application discloses a method and apparatus for 3D printing a multilayer structure of a functional gradient material, which introduces a step-by-step printing strategy. Unlike the printing of other traditional materials and processes, the single-layer printing process is carried out in steps, corresponding to different printing areas: a border area and a filling area; a top heating module is added to preliminarily pre-cure the liquid material that is easy to flow. The degree of pre-curing is controlled in a semi-cured state. According to the printed functional gradient material, a specific optimized value is selected. The filling area is constrained by the border area, and the material is confined within the border, ensuring the morphology of the entire part. The present application solves the problem of easy spreading during the printing process of thermosetting liquid materials, and realizes the precision, integration, and efficient manufacturing of functional gradient multilayer structures.

The present application relates to a kind of based on high flux SLM technology preparation 316L / IN718 functional gradient material method, belong to additive manufacturing technical field, solve the technical problem that the existing technology does not prepare high-precision, excellent mechanical property 316L / IN718 functional gradient material component.It is a kind of based on high flux SLM technology preparation 316L / IN718 functional gradient material method, including step 1, with 316L powder as raw material, using high flux SLM technology is deposited on substrate and forms iron-based alloy layer;Step 2, with the raw material of mixed uniform 316L powder and Inconel718 powder, using high flux SLM technology is deposited on iron-based alloy layer and forms several nickel-iron-based gradient layer of composition gradual change, constitute nickel-iron-based gradient zone;Step 3, with Inconel718 powder as raw material, using high flux SLM technology is deposited on nickel-iron-based gradient zone and forms nickel-based alloy layer, obtains the 316L / IN718 functional gradient material component of deposited state.The present application can prepare the 316L / IN718 functional gradient material component of excellent mechanical property.

The invention relates to a method for preparing a 316L / IN718 functionally graded material based on a high-throughput SLM technology, belongs to the technical field of additive manufacturing, and solves the technical problem that a 316L / IN718 functionally graded material component with high precision and excellent mechanical property cannot be prepared in the prior art. A method for preparing a 316L / IN718 functionally graded material based on a high-throughput SLM technology comprises the steps that 1, 316L powder serves as a raw material, and an iron-based alloy layer is deposited on a substrate through the high-throughput SLM technology; 2, uniformly mixed 316L powder and Inconel718 powder are used as raw materials, a high-flux SLM technology is adopted for deposition on the iron-based alloy layer to form a plurality of nickel-iron-based gradient layers with gradually-changed components, and a nickel-iron-based gradient area is formed; and 3, the Inconel 718 powder serves as a raw material, a high-flux SLM technology is adopted for deposition on the nickel-iron-based gradient area to form a nickel-based alloy layer, and the 316L / IN718 functionally graded material component in the deposition state is obtained. According to the method, the 316L / IN718 functionally graded material component with excellent mechanical properties can be prepared.

The application relates to the field of 3D printing technology and discloses a functional gradient material light-curing 3D printing device which comprises a processing platform, a material conveying device, a printing device, a laser positioner, a material layering device, a positive pressure air path device and a controller. First, the functional gradient material is laid by the material layering device, is conveyed to the lower side of the printing platform by the material conveying device, is pre-light-cured, and then is recycled to print the next layer, and is solidified, so that the material transition problem in the printing process of multiple photosensitive materials can be solved, and the precise, integrated and efficient manufacturing of the functional gradient material structure can be realized.

The application discloses an additive manufacturing method of a bionic functional gradient heat protection structure and belongs to the technical field of additive manufacturing. The method designs a heat protection structure skin structure as a heat insulation layer, a heat absorption layer and a bearing layer, the heat insulation layer is composed of low-thermal-conductivity ablation-resistant heat protection materials, the heat absorption layer is composed of heat insulation honeycomb plates and expanded foam materials, and the bearing layer is composed of a functionally gradient material tree root bionic structure integrally formed through additive manufacturing. The method comprises the following steps: determining the size of a three-dimensional model of a skin and a frame of a heat protection structure workpiece; inputting bearing and heat insulation requirements; topological optimization of a tree root bionic structure; selection of a functionally gradient layer composition gradient; designing a three-dimensional model of a bionic structure; simulation verification of design parameters; slicing of the three-dimensional model and planning of a laser processing path; adding heat absorption foam materials inside the heat insulation honeycomb plates; coating the surface of the heat absorption layer with heat protection materials; and post-processing to obtain a final formed piece. The application realizes the preparation of a bionic functional gradient heat protection structure skin facing the additive manufacturing technology, has excellent heat insulation performance, a lightweight structure, strong designability, high mechanical properties and other characteristics, has wide application potential in the fields of aerospace and national defense and military affairs, and expands the application prospect of additive manufacturing.