Connecting method of stephanoporate inner core and compact outer shell

Abstract

The invention discloses a connection method of porous belly core and compact shell, the method is that: choose metal A and B powder in the range of negative 80 to positive 500 items, blend according to atom ratio 1 / 1, then put into a mixer to mix evenly, then package the A,B metal mixing powder into a compact tube made of metal A directly, after 2.5 to 5.0 MPa mould pressing and forming, weld in vacuum at 350 to 1200 DEG C. for 1 to 2 hours; wherein, the spreading speed of metal B in the metal A is large than that of the metal A in the metal B, the porous material is AB alloy, the compact material is metal A. With the method of powder metallurgy, the invention uses little alloy which can produce Kirkendall effect and welding swelling during welding, to finish welding spreading welding, and makes two parts connected into a whole body without air leakage and has good sealing performance, which can realize the integration forming of the porous material and the compact material, and has simple technics and lowers the production cost greatly.

Description

technical field [0001] The invention relates to a connection method of metal materials, in particular to a connection method of a porous inner core and a dense outer shell. Background technique [0002] With the development of modern industry, the application fields of metal porous materials and their equipment have been continuously expanded. From early filtration and separation to throttling and surface combustion, from noise reduction, shock resistance to ultra-light structure, etc., it has become a multifunctional New functional materials with excellent performance and structural properties are widely used in industries such as metallurgical machinery, petrochemical industry, energy and environmental protection, national defense and military industry, nuclear technology, and biopharmaceuticals. They are indispensable key materials for the above-mentioned industries to achieve technological breakthroughs. This has led to the multi-directional development of the material, ...

AI Technical Summary

Problems solved by technology

At present, most manufacturers in China adopt the process of making porous materials and dense materials separately, and then welding them together. The tensile strength of the filter element is reduced, which affects the service life of the filter element

In addition, there are more problems in the welding of small-sized porous materials and dense materials. Argon arc welding usually has a relatively large weld width, which reduces the effective area of ​​porous materials and even completely blocks the holes; although laser welding has a relatively small weld width Small, but the depth of penetration is not easy to control, the consistency of batch components is not good, and the cost is high