CN100528423C - Connecting method of stephanoporate inner core and compact outer shell - Google Patents
Connecting method of stephanoporate inner core and compact outer shell Download PDFInfo
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- CN100528423C CN100528423C CNB2007100185949A CN200710018594A CN100528423C CN 100528423 C CN100528423 C CN 100528423C CN B2007100185949 A CNB2007100185949 A CN B2007100185949A CN 200710018594 A CN200710018594 A CN 200710018594A CN 100528423 C CN100528423 C CN 100528423C
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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
The present invention relates to a kind of method of attachment of metal material, be specifically related to the method for attachment of a kind of stephanoporate inner core and compact outer shell.
Background technology
Along with development of modern industry, the application of metal polyporous material and equipment thereof is constantly expanded, from early stage filtration be separated to throttling, surface combustion, from eliminate the noise, antidetonation is to Superlight etc., become a kind of new function material that has the excellent performance of function and structure double attribute concurrently, being widely used in industry such as metallurgical machinery, petrochemical industry, energy environment protection, defence and military, nuclear technology and bio-pharmaceuticals, is the indispensable critical material of above-mentioned industrial realization technological break-through.Driven the multi-direction development of material, shape and the kind of metal polyporous material thus, material develops into high temperature alloys such as stainless steel, titanium or titanium alloy, nickel alloy and tungsten, molybdenum, FeAl, FeCrAl by early stage copper, nickel, bluish yellow copper etc., its shape is extended to complicated shapes such as folding, quincunx from simple pipe, sheet, plate, band shape, to super large and microminiaturization development, kind also develops into complicated equipment by simple porous material to size by routine.
The application of metal polyporous material and equipment thereof is more and more, and the welding of porous material and dense material is also more and more important, and the quality of weld strength will directly influence the quality of whole element.What domestic now most of manufacturer adopted is with porous material and dense material split production, and then the technology that welds together, complex procedures, and the residual stress of the hole that easily produces in the weld seam, tissue oxidizing and cooling generation, make the tensile strength of whole filter element reduce, influence the service life of filter element.In addition, also there are more problems in the welding of undersized porous material and dense material, and the common weld width of argon arc welding is big relatively, the effective area of porous material is reduced, even all stop up hole; Though the Laser Welding weld width is less relatively, fusion penetration is wayward, and the uniformity of element is bad in batches, and cost is higher.If when the sintering of porous material, finish the welding with dense material simultaneously, the two is linked into an integrated entity, then can realize the integrated molding of porous material and dense material, and technology is simple, can reduce production costs greatly.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing coating conductor barrier layer technology of preparing, provide a kind of technology simple, produce the low stephanoporate inner core of cost and the method for attachment of compact outer shell in batches, to realize the integrated molding of porous material and dense material.
To achieve these goals, the technical solution used in the present invention is: the method for attachment of a kind of stephanoporate inner core and compact outer shell, inner core is a porous material, shell is a dense material, it is characterized in that this method of attachment is: select metal A, B powder in-80～+ 500 order scopes, by 1: 1 batching of its atomic ratio, put into the batch mixer mixing after the batching, then A, B metal mixed powder are directly packed in the fine and close pipe of making by metal A, through the 2.5-5.0MPa compression molding, in 350-1200 ℃ of vacuum-sintering 1-2 hour; Wherein the diffusion velocity of metal B in metal A is greater than the diffusion velocity of metal A in metal B, and porous material is the AB alloy, and dense material is a metal A.
Described AB alloy is Ti-Al alloy, Ti-Ni alloy, Fe-Al alloy, Fe-Cu alloy, Al-Cu alloy or Cu-Zn alloy etc.
The present invention utilizes some alloys owing to the Kirkendall effect sintering grow phenomenon can take place when sintering, show as the B metal to the diffusion velocity of A metal greater than the diffusion velocity of A metal to the B metal, and stay stable hole in B metal origin-location, or on the basis of pre-existent pore, form newly than macrovoid, become porous material; By of the diffusion of B metal, finished the sintering diffusion welding (DW) between AB metal polyporous material and the A dense material simultaneously, the two is linked into an integrated entity to the A metal.
The present invention compared with prior art has the following advantages: the present invention passes through powder metallurgy process, utilize some alloys that Kirkendall effect and sintering grow phenomenon take place when sintering, finish the sintering diffusion welding (DW) of porous material and dense material, the two is linked into an integrated entity, air tight, good airproof performance can be realized the integrated molding of porous material and dense material, and technology is simple, can reduce production costs greatly.
The specific embodiment
The present invention will be further described below in conjunction with embodiment.
Embodiment 1
TiAl is an alloy, and fine and close pipe is Ti, and stephanoporate inner core is the TiAl alloy.Ti, Al powder in-80～+ 500 order scopes of selection, press 1: 1 batching of atomic ratio, put into SPEX8000M high energy batch mixer mixing, in the fine and close Ti pipe of then mixed powder directly being packed into, through the 2.5-5.0MPa compression molding, at last in 600-800 ℃ of vacuum-sintering 1-2 hour.The diffusion velocity of Al in Ti by the diffusion of Al to Ti, realized the sintering diffusion welding (DW) between TiAl porous material and the fine and close Ti pipe greater than the diffusion velocity of Ti in Al.Porosity is 10-30%, and when pressure was 0.2MPa, gas passed through from the hole of TiAl, rather than spills from the junction between TiAl and the fine and close Ti pipe, illustrates and has realized sintering diffusion welding (DW) between the two, links into an integrated entity.
Embodiment 2
TiNi is an alloy, and fine and close pipe is Ti, and stephanoporate inner core is the TiNi alloy.Ti, Ni powder in-100～+ 400 order scopes of selection, press 1: 1 batching of atomic ratio, put into SPEX8000M high energy batch mixer mixing, in the fine and close Ti pipe of then mixed powder directly being packed into, through the 2.5-5.0MPa compression molding, at last in 800-950 ℃ of vacuum-sintering 2 hours.The diffusion velocity of Ni in Ti is Ti 4000 times of diffusion velocity in Ni, the position that pressed compact Central Plains pre-exists Ni becomes the cavity very soon, the Ni atom and the Ti that enter among the Ti form compound, cause macroscopical volume to increase, and have realized the sintering diffusion welding (DW) between TiNi porous material and the fine and close Ti pipe.Porosity is 10-30%, and when pressure was 0.2MPa, gas passed through from the hole of TiNi, rather than spills from the junction between TiNi and the fine and close Ti pipe, illustrates and has realized sintering diffusion welding (DW) between the two, links into an integrated entity.
Embodiment 3
FeAl is an alloy, and fine and close pipe is stainless steel, and stephanoporate inner core is the FeAl alloy.Fe, Al powder in-200～+ 400 order scopes of selection, press 1: 1 batching of atomic ratio, put into SPEX8000M high energy batch mixer mixing, in the fine and close stainless steel tube of then mixed powder directly being packed into, through the 2.5-5.0MPa compression molding, at last in 600-800 ℃ of vacuum-sintering 2 hours.The diffusion velocity of Al in Fe by the diffusion of Al to Fe, realized the sintering diffusion welding (DW) between FeAl porous material and the fine and close stainless steel tube greater than the diffusion velocity of Fe in Al.Porosity is 20-40%, and when pressure was 0.2MPa, gas passed through from the hole of FeAl, rather than spills from the junction between FeAl and the fine and close stainless steel tube, illustrates and has realized sintering diffusion welding (DW) between the two, links into an integrated entity.
Embodiment 4
FeCu is an alloy, and fine and close pipe is stainless steel, and stephanoporate inner core is the FeCu alloy.Fe, Cu powder in-150～+ 400 order scopes of selection, press 1: 1 batching of atomic ratio, put into SPEX8000M high energy batch mixer mixing, in the fine and close stainless steel tube of then mixed powder directly being packed into, through the 2.5-5.0MPa compression molding, at last in 1100-1200 ℃ of vacuum-sintering 1-2 hour.The diffusion velocity of Cu in Fe by the diffusion of Cu to Fe, realized the sintering diffusion welding (DW) between FeCu porous material and the fine and close stainless steel tube greater than the diffusion velocity of Fe in Cu.Porosity is 10-20%, and when pressure was 0.2MPa, gas passed through from the hole of FeCu, rather than spills from the junction between FeCu and the fine and close stainless steel tube, illustrates and has realized sintering diffusion welding (DW) between the two, links into an integrated entity.
Embodiment 5
AlCu is an alloy, and fine and close pipe is Al, and stephanoporate inner core is the AlCu alloy.Al, Cu powder in-100～+ 400 order scopes of selection, press 1: 1 batching of atomic ratio, put into SPEX8000M high energy batch mixer mixing, in the fine and close Al pipe of then mixed powder directly being packed into, through the 2.5-5.0MPa compression molding, at last in 350-600 ℃ of vacuum-sintering 2 hours.The diffusion velocity of Cu in Al by the diffusion of Cu to Al, realized the sintering diffusion welding (DW) between AlCu porous material and the fine and close Al pipe greater than the diffusion velocity of Al in Cu.Porosity is 10-20%, and when pressure was 0.2MPa, gas passed through from the hole of AlCu, rather than spills from the junction between AlCu and the fine and close Al pipe, illustrates and has realized sintering diffusion welding (DW) between the two, links into an integrated entity.
Claims (2)
1, the method for attachment of a kind of stephanoporate inner core and compact outer shell, stephanoporate inner core is a porous material, compact outer shell is a dense material, it is characterized in that this method of attachment is: select metal A, B powder in-80～+ 500 order scopes, by its atomic ratio 1: 1 batching, put into the batch mixer mixing after the batching, in the fine and close pipe of making by metal A of then A, B metal mixed powder directly being packed into, through the 2.5-5.0MPa compression molding, in 350-1200 ℃ of vacuum-sintering 1-2 hour; Wherein the diffusion velocity of metal B in metal A is greater than the diffusion velocity of metal A in metal B, and porous material is the AB alloy, and dense material is a metal A.
2, the method for attachment of a kind of stephanoporate inner core according to claim 1 and compact outer shell is characterized in that: described AB alloy is Ti-Al alloy, Ti-Ni alloy, Fe-Al alloy, Fe-Cu alloy, Cu-Al alloy or Cu-Zn alloy.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100185949A CN100528423C (en) | 2007-09-05 | 2007-09-05 | Connecting method of stephanoporate inner core and compact outer shell |
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| CNB2007100185949A CN100528423C (en) | 2007-09-05 | 2007-09-05 | Connecting method of stephanoporate inner core and compact outer shell |
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| CN101108421A CN101108421A (en) | 2008-01-23 |
| CN100528423C true CN100528423C (en) | 2009-08-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101560615B (en) * | 2009-05-15 | 2011-01-19 | 西安理工大学 | Method for preparing metallic hollow microsphere powder |
| CN102864323B (en) * | 2012-09-25 | 2014-07-02 | 中国科学院金属研究所 | Preparation method of Ni-Al alloy porous material with controllable structure |
| CN103624354B (en) * | 2013-12-12 | 2016-02-03 | 西北有色金属研究院 | The plug-in type welding method of a kind of metal compaction pipe and metal perforated pipe |
| CN105499576B (en) * | 2016-01-11 | 2018-01-16 | 北京科技大学 | A kind of method that powder metallurgy prepares porous titanium-aluminium alloy |
| CN109093123A (en) * | 2018-09-12 | 2018-12-28 | 北京恒源天桥粉末冶金有限公司 | A kind of preparation method of Combined filter element |
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