7 results about "Functionally gradient material" patented technology

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 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 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 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 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 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.