167 results about "Functionally graded material" patented technology

There is disclosed a method of making a metallic or ceramic component, such as a cutting or forming tool, from at least two distinct powder precursors. In one embodiment, the method comprising forming a first mixture comprised of a plurality of coated particles, such as Tough-Coated Hard Powder (TCHP) composite particles created by encapsulating extremely hard core particles with very tough binder and structural materials, and at least one support powder, such as a carbide, typically WC—Co. The mixture is formed into a green body and sintered to form a functionally graded or multicomponent article. Non-limiting examples of the articles made from the disclosed methods are also disclosed and include drills, mills, cutting tools, forming tools, wires dies and mechanical components.

The present invention is a method for producing functionally graded materials that contain a hard phase that is embedded in a metal matrix phase. The material have a continuous gradient of a matrix metal phase. An example of these types of materials include functionally graded cemented tungsten carbide (the hard phase) that has a continuous gradient of cobalt (the matrix metal) from one reference position, for example, one surface of a part, to another reference position, for example, the opposite surface of the part or within the part. The functionally graded materials are sintered via a liquid phase sintering (LPS) technique. In order to achieve the desired continuous gradient of the matrix metal, an initial gradient of one of the chemical elements of the hard phase is designed and built into the part prior to liquid phase sintering. The exact gradient of the composition material elements that will be required depends on factors such as the desired final matrix metal gradient, the dimension of the part to be made, and the sintering time and temperature.

The invention discloses a powder spreading processing based functionally graded material preparation device and method. The powder spreading processing based functionally graded material preparation device comprises a powder spreading device, a feeding device, a powder collecting device and a powder mixing control device; the feeding device, the powder collecting device and the powder mixing control device are connected sequentially from upside to downside through pipelines; the feeding device comprises three powder cylinders, i.e., powder cylinder A, powder cylinder B and powder cylinder C; the powder collecting device comprises a powder collecting chamber; the powder mixing control device is provided; the powder cylinders are connected to the powder collecting chamber through pipelines, and flow controllers and gas power generators are arranged on the pipelines sequentially from upside to downside; a pressure-limiting valve is arranged at the joint of the powder collecting chamber and the powder mixing control device. The functionally graded material which is prepared by adopting the device and method has no obvious interface or separated layer, the gradient change can be realized in a horizontal plane and a vertical plane of substrate during the processing process, good spatial continuity is achieved, direct melting molding of high-melting metal can be realized, and the use range of the functionally graded material is enlarged.

The invention discloses a laser near-net shaping method for a metal-ceramic multi-dimensional functionally-graded structural component. According to the laser near-net shaping method for the metal-ceramic multi-dimensional functionally-graded structural component, a laser fast shaping system is used for combining metal powder and ceramic powder, which are used as raw materials and have changeable proportioning rates, to form the multi-dimensional functionally-graded structural component directly. The laser near-net shaping method specifically includes the following steps: firstly, two types or more than two types of metal powder and ceramic powder are dried and respectively placed in different powder barrels of a powder feeding device; secondly, inert gas is used as powder feeding and protecting gas; and lastly, a numerical control program is used for controlling the moving trajectory and the moving speed of a laser machining head and the real-time powder feeding amount of each powder barrel of the powder feeding device, the change of gradients can be realized in a horizontal plane and a vertical plane of a base plate, and therefore the complex multi-dimensional gradient change in the overall space can be realized. On one hand, the laser near-net shaping method for the metal-ceramic multi-dimensional functionally-graded structural component is a direct shaping method, and on the other hand, the laser near-net shaping method is suitable for melting solidification shaping of various high-melting-point materials, and the selection range of the design of functionally-graded materials is expanded.

A turbine vane includes a platform; and at least one airfoil mounted to the platform and having a trailing edge and a leading edge, wherein the vane is composed of a functionally graded material having a first material and a second material, wherein the trailing edge includes a greater amount of the first material than the second material, and the leading edge includes a greater amount of the second material than the first material.

The invention relates to a laser additive manufacturing method for a homogeneous functionally graded material and structure. The method includes the following steps that different functions are mapped into different temperatures which serve as boundary conditions to be exerted on different parts of a three-dimensional model; a three-dimensional finite element method is used for calculating a heat conduction equation of the model, inner temperature graded distribution, namely the temperature field of a model, is obtained, that is a temperature field of the model is obtained; an isothermal surface of the model is extracted, and a curved surface set with different temperature marks is obtained; slicing is conducted on the curved surface set, the intersection outline of each layer and the isothermal surface is obtained, in other words, plane isothermal lines are obtained; slices of each layer are processed, and a scanning route with laser parameters of the single layer in graded variation is obtained; the steps are repeatedly conducted until slicing is completed and a laser scanning route of the model is obtained; the generated laser scanning route is input into a laser 3D printing machine to control the additive manufacturing process, and the homogeneous functionally graded structure is obtained. According to the additive manufacturing method, the fact that the homogeneous functionally graded material and the homogeneous functionally graded structure can be manufactured in an additive mode is achieved, and the fact cannot be achieved through a current laser additive manufacturing method.

A device for implantation a patient may include a tubular fiber wall that defines at least one opening and at least one lumen continuous with the one opening and adapted to allow the passage of fluid. The tubular fiber wall typically contains a porosity gradient that is adapted to permit passage of different size substances at different locations along the gradient. In one aspect, a second tubular fiber wall substantially encircling the tubular fiber wall.

The invention discloses an electromagnetic flexible composite fused deposition direct preparation forming method for a gradient part. The method comprises the following steps of 1, building a model, wherein functionally graded material CAD/CAM software is applied to build a geometric three-dimensional part model, and material gradient distribution and tissue gradient distribution are determined in the geometric three-dimensional model to form a space comprehensive model; 2, cutting the model into slices and generating numerical control codes, wherein layering and slicing processing is performed on the space comprehensive model formed in the step 1, and numerical control codes are generated; 3, obtaining a reverse solution for electromagnetic characteristics, wherein the reverse solution for externally-added magnetic pole distribution and exciting current characteristics is obtained; 4, performing fused deposition formation, wherein magnetic poles and/or electromagnetic coils are arranged, and fused deposition formation is performed layer by layer. According to the electromagnetic flexible composite fused deposition direct preparation forming method, the CAD/CAM software is adopted for determining the part organization and the material gradient distribution; with the combination of electricity-magnetism-heating power multi-physical field coupling control, integrated manufacturing of the gradient organization and gradient material part shape and microstructure is achieved.

A method and system for depositing multiple materials onto a substrate is described. The method broadly comprises the steps of providing a source of a first powder material to be deposited, providing a source of a second powder material to be deposited, and sequentially depositing the first powder material and the second powder material onto the substrate at a velocity sufficient to deposit the materials by plastically deforming the materials without metallurgically transforming the particles of powder forming the materials.

A method for manufacturing functionally graded cemented tungsten carbide with hard and wear-resistant surface and tough core is described. The said functionally graded cemented tungsten carbide (WC—Co) has a surface layer having a reduced amount of cobalt. Such a hard surface and tough core structure is an example of functionally graded materials in which mechanical properties are optimized by the unique combination of wear-resistance and toughness. WC—Co with reduced-cobalt surface layer may be fabricated through a carburization heat treatment process following conventional liquid phase sintering. The graded WC—Co thus obtained contains no brittle η phase.

The invention provides a 3D printer for integral manufacturing of a functionally graded material and a forming structure, and a working method thereof. A feeding module, a mixing module and a printingsprayer are split; and through ingenious arrangement of the components, integral manufacturing of the continuous functionally graded material and the complex three-dimension structure can be achieved. The 3D printer has the characteristics and outstanding advantages of active, efficient and uniform mixing of various materials, high print resolution (due to micro-nano microscale characteristic structure printing), diverse applicable materials, high production efficiency, low cost and simple structure; and particularly, the 3D printer can achieve integral manufacturing of the continuous functionally graded material and the complex three-dimension structure based on material composition and microstructures.

The invention relates to an incremental sheet metal stirring composite forming device and method. The forming device comprises an incremental stirring forming tool head, a reverse roof pressure head, a spindle motor, a main drive unit, an auxiliary drive unit and a sheet metal fixture. The forming method includes: generating an incremental forming track according to a three-dimensional model of a machining part to be machined to serve as a synchronous movement track of the main drive unit and the auxiliary drive unit; controlling the spindle motor to rotate, allowing the incremental stirring forming tool head to be driven to rotate by the spindle motor to be inserted in the interior of a sheet metal to be machined, and the reverse roof pressure head and the incremental stirring forming tool head pressing the sheet metal; respectively controlling the incremental stirring forming tool head and the reverse roof pressure head to move synchronously according to the synchronous movement track to complete incremental sheet metal stirring composite forming. Compared with the prior art, the incremental sheet metal stirring composite forming device and method has the advantages that functionally graded materials can be integrated in welding and forming, the manufacturing process is shortened, the number of tools is reduced, and the problem that traditional functionally graded materials are poor in extension and cannot be formed can be avoided as well.

The electrical power generation system using renewable energy is particularly adapted to provide electrical power to an independent or remotely situated electrical device such as a street light, emergency call box, or illuminated road sign. The system includes a pivotally mounted venturi with vanes assuring that the venturi is oriented into the prevailing wind. A vertical axis wind turbine is installed in the venturi throat, and drives a shaft extending through the column upon which the venturi is installed to a generator at the base of the column. The venturi and vanes may include photovoltaic cells thereon for further electrical power. The venturi may be heated from a geothermal source, and may include a variable diameter internal wall to adjust the cross-sectional area of the throat of the venturi. The use of functionally graded materials and other phase change materials may also improve the performance of the device.

The invention discloses a multi-layer composite super-wear-resistant liner of sandwich structure and a preparation process of the liner, belonging to the field of preparation of wear-resistant liners. The wear-resistant liner is composed of a substrate support layer, a bonding transition layer and a hard surface wear-resistant layer by compositing functionally graded materials, wherein the substrate support layer is formed by compression instead of conventional casting; the bonding transition layer is formed by flame remelting with self-fluxing alloy material, having good substrate invasion and high bonding strength; and the hard surface wear-resistant layer is formed by flame remelting with ceramic alloy material, having excellent bonding performance and high abrasive resistance. Compared to the prior art, by gathering the advantages of high toughness of the metal material and high abrasive resistance of the ceramic alloy material, the multi-layer composite super wear-resistant liner of sandwich structure and the preparation process thereof disclosed by the invention have the advantages of simple substrate forming process, low cost, and strong controllability of coating material and process, so that complicated technology for heating processing during an alloy casting process is avoided and the service life is prolonged by more than 10 times compared with that of ordinary steel liners.