Connecting method of stephanoporate inner core and compact outer shell

Abstract

The invention discloses a method for connecting porous inner cores with compact casings, which comprises the following steps: -80-+500 meshes of metal powder A and B are selected and blended in atom ratio 1:1, then are put into a mixer to mix evenly; the mixed powder A, B is directly packaged into a compact tube made of metal A, after 2.5 to 5.0 MPa mould pressing and forming, the mixed powder A, B is sintered in vacuum at 350 to 1200 DEG C for 1 to 2 hours; wherein, the diffusion velocity of metal B in the metal A is quicker than the diffusion velocity of the metal A in the metal B, the porous material is AB alloy, the compact material is metal A. By adopting the powder metallurgy method, the invention takes use of the Kirkendall effect and the sintering grow phenomenon when some alloys is sintered to achieve sintering and diffusion welding of porous material and compact material, so that the porous material and the compact material are connected into an integral part without any air leakage and good air tightness. The invention can realize the integrated molding of the porous material and the compact material, and the process is simple and the production cost is greatly reduced.

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, ...