Electron beam partition scanning forming method for porous tungsten material

Abstract

The invention discloses a method for forming a porous tungsten material by electron beam partition scanning, the method comprising: 1. establishing a three-dimensional lattice structure model; 2. establishing a porous body model; 3. merging the porous tungsten material model and layering it; 1. Import the layered porous tungsten material model into the electron beam selective melting forming equipment, and then perform input parameters, powder loading, leveling the forming bottom plate, vacuuming and preheating; 5. Selective melting and selective melting of tungsten powder Sintering to obtain a single-layer solid sheet; 6. Repeat the preparation process of the single-layer solid sheet to form a porous tungsten material; 7. Remove residual powder after cooling to form a porous tungsten material. The invention adopts the electron beam partition scanning forming method to sequentially prepare the three-dimensional lattice structure and the porous body structure of the porous tungsten material, and adjusts the mechanical properties and porosity of the porous tungsten material by adjusting the three-dimensional lattice structure and the sintering degree of the internal porous body, and the process flow is short , suitable for porous tungsten materials with special requirements, expanding the application range of porous tungsten materials.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to an electron beam partition scanning forming method for a porous tungsten material. Background technique [0002] Porous materials have the characteristics of low density and high specific surface, and have important applications in many technical fields such as catalysts, filtration, and composite materials. Porous tungsten materials are widely used in aerospace, power electronics, metallurgical industries and other extreme environment fields because of their high melting point and boiling point, low vapor pressure and other characteristics of tungsten. For example, it can be used for porous cathode substrates with high current density, filters for high-temperature fluids, high-temperature gas purifiers, skeletons of sweating materials, and gas distribution materials at high temperatures. At the same time, the porous tungsten matrix can also be used to m...

AI Technical Summary

Problems solved by technology

In the patent "a method for preparing porous tungsten with uniform pores (publication number CN108436079 A)", the powder with a narrow particle size distribution is used as the raw material, and the porous tungsten is prepared by the traditional pressing-sintering method, which realizes mass production, but this method cannot be directly formed For special-shaped porous materials, it is difficult to ensure the connectivity of pores

The patent "An electrolytic preparation method of porous tungsten" (authorized publication number CN103774184 B) provides a method for preparing porous materials by electrolytically treating tungsten blocks by electrochemical methods and adjusting porosity by controlling weight loss. Pore ​​distribution and depth of porous tungsten are difficult to control

The patent "high-porosity microporous reticular porous tungsten structure and its preparation method (authorized publication number CN101660080 B)" provides a through-hole organic foam as a carrier, using grouting to obtain a green body, and then performing high-temperature vacuum sintering to obtain a porous body This method can prepare tungsten porous structure with high porosity, but because of the need to use foam carrier and binder, the purity of the sample is affected, and at the same time, the uniformity of slurry spreading on the carrier is also difficult to control

The patent "A method for preparing porous tungsten bulk material with uniform and controllable pores (authorized publication number CN105734332 B)" provides a method for preparing porous tungsten materials by plasma rapid sintering. This method requires the use of molds. There will be restrictions on the forming of porous components

The patent "A method for preparing heterogeneous porous tungsten products with uniform pores (publication number CN105499574 A)" provides a method for preparing porous tungsten structures by injection molding technology, which can be used to prepare porous tungsten products with complex shapes and high dimensional accuracy structure, however, this method requires the use of binders, and the process is more complicated

Images