Connecting method of stephanoporate inner core and compact outer shell

A connection method and dense technology, applied in the field of connection between porous inner core and dense outer shell, can solve problems such as complex process, high cost, and clogged holes, and achieve the effect of simple process, reduced production cost, and good airtightness

Inactive Publication Date: 2008-01-23
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] TiAl series alloy, the dense tube is Ti, and the porous inner core is TiAl alloy. Select Ti and Al powders within the range of -80 to +500 mesh, mix them in an atomic ratio of 1:1, put them into a SPEX8000M high-energy mixer and mix them evenly, then directly put the mixed powder into a dense Ti tube, and pass through 2.5-5.0 MPa compression molding, and finally vacuum sintering at 600-800°C for 1-2 hours. The diffusion rate of Al in Ti is greater than that of Ti in Al. Through the diffusion of Al to Ti, the sintered diffusion welding between TiAl porous material and dense Ti tube is realized. When the porosity is 10-30%, and the pressure is 0.2MPa, the gas passes through the pores of TiAl instead of leaking from the connection between TiAl and dense Ti tube, indicating that the sintering diffusion welding has been realized between the two, and the connection becomes One.

Embodiment 2

[0013] TiNi alloy, the dense tube is Ti, and the porous inner core is TiNi alloy. Select Ti and Ni powders within the range of -100 to +400 mesh, mix them in an atomic ratio of 1:1, put them into a SPEX8000M high-energy mixer, and then put the mixed powder directly into a dense Ti tube. After 2.5-5.0 MPa compression molding, and finally vacuum sintering at 800-950°C for 2 hours. The diffusion rate of Ni in Ti is 4,000 times that of Ti in Ni. The part where Ni originally existed in the compact quickly becomes a cavity, and the Ni atoms entering Ti form a compound with Ti, resulting in an increase in the macroscopic volume. Sintered diffusion welding between TiNi porous material and dense Ti tube. When the porosity is 10-30% and the pressure is 0.2MPa, the gas passes through the pores of TiNi instead of leaking from the joint between TiNi and dense Ti tube, indicating that the sintering diffusion welding has been realized between the two, and the connection becomes One.

Embodiment 3

[0015] FeAl alloy, the dense tube is stainless steel, and the porous inner core is FeAl alloy. Select Fe and Al powders within the range of -200 to +400 mesh, and mix them in the SPEX8000M high-energy mixer according to the atomic ratio of 1:1. MPa compression molding, and finally vacuum sintering at 600-800°C for 2 hours. The diffusion rate of Al in Fe is greater than that of Fe in Al. Through the diffusion of Al to Fe, the sintered diffusion welding between FeAl porous material and dense stainless steel tube is realized. When the porosity is 20-40%, and the pressure is 0.2MPa, the gas passes through the pores of FeAl instead of leaking from the connection between FeAl and dense stainless steel pipe, indicating that the sintering diffusion welding has been realized between the two, and the connection becomes One.

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PUM

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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, ...

Claims

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Application Information

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IPC IPC(8): B22F7/08C22C1/08
Inventor 谈萍汤慧萍康新婷汪强兵李程朱纪磊王建永葛渊
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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