CN1686599A - Porous non layer boundary gradient metal film pipe and its preparation method - Google Patents
Porous non layer boundary gradient metal film pipe and its preparation method Download PDFInfo
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Abstract
A porous gradient metallic membrane pipe without layer interface is prepared through preparing slurry from basic metallic material, adhesive and carrier, filing it in metallic pipe mould, centrifugal shaping, removing carrier, baking, demoulding and sintering.
Description
Technical field
The present invention relates to that inoranic membrane prepares category in the Metallic Functional Materials field, specifically be a kind of porous non layer boundary gradient metal film pipe structure, form and preparation method thereof.
Background technology
Metal film has three big advantages: the one, and the mechanical strength height, can under higher pressure, use, and can not cause the distortion and the damage of membrane module and membrane material, the mode of the pressure reduction of available raising film both sides improves infiltration rate in film separates like this, because the intensity height is not fragile in operation, can reduce the replacing of membrane module, be good membrane carrier materials in addition.The 2nd, it has good heat-conductive characteristic.Because the material of metal film is the metal or alloy of good heat conductivity, metal film shows good thermal conductivity, perfect heat-dissipating in high temperature (organic relatively film) application, the service life that the thermal stress of minimizing membrane module improves membrane module.The 3rd, its favorable sealing property.It is to carry out under certain pressure that film separates, and required membrane module is wanted good seal performance, and metal membrane material is the metal or alloy of good welding performance, has excellent sealing performance.And in filter process, metal film has that the adsorbance of pair dirt is big, supportive good, filter area is big, the serviceability temperature scope is big, clean (can carry out chemistry, machinery or heated wash and backwash) easily, the life-span is long, and actual application value is arranged.Metal film has been widely used in fields such as machinery, electronics, chemistry, atomic energy, medical and health, biology.
What generally adopt when the preparation metal film pipe at present is the multilayer dissymmetrical structure, promptly generally includes the porous carrier (bottom) with certain mechanical strength, the approximate number millimeters thick, and it is the matrix of whole film pipe, the mechanical strength of film pipe is guaranteed by it.Have on carrier that the aperture is very little, the control rete of very thin thickness, centrifugation is mainly reached by it.Between carrier and control rete, also include one or more layers intermediate layer, the multilayer dissymmetrical structure of Here it is metal film.Like this, metal film will be by moulding and sintering process repeatedly, because metal film prepares required metal dust price and is higher than ceramic powders, its preparation cost has been higher than ceramic membrane, if adopt existing moulding and sintering process repeatedly, the metal film of the multilayer dissymmetrical structure that makes is like this cost an arm and a leg, than the price height of ceramic membrane, just high especially more a lot of than organic film, will restrict the application and the development of metal film.If can one-shot forming make metal film pipe, just require this metal film pipe to have gradient-structure, promptly the aperture has more performance at continually varying metal film radially than the metal film of sandwich construction.The asymmetric metal film of multilayer key-course or transition zone in the preparation all is on the body attached to preceding one deck macropore, because the powder granule diameter suddenlys change, following one deck powder granule will certainly stop up a part of last layer macropore, like this, will reduce the ability that sees through of metal film.The porous gold film of producing at present belongs to the aperture overwhelming majority also at micron order, and filtering accuracy is 2-50um, is mainly used in the coarse filtration of liquids and gases.In the practice, the someone thinks that this class porous metal film also is not a film truly, and is porous metals.And these porous metals membrane components all are the porous metal film pipe of symmetrical structure at present, and on whole filtering flow direction (radially), the aperture of film is consistent, and this structure will influence the serviceability of film pipe greatly.The porous metal film pipe is different from general metal pipe material, and it should have high intensity, excellent corrosion resisting performance, and high filtering accuracy and big filtration flux more will be arranged.
In sum, there is following deficiency in present existing metal film pipe:
(1) metal film in the preparation key-course or transition zone all be that because the powder granule diameter suddenly change, following one deck powder granule will certainly stop up a part of last layer macropore on the body attached to preceding one deck macropore, like this, will reduce metal film through ability.
(2) during the prior art for preparing metal film, just very high to the requirement of powder material, have only powder material particle of uniform size, just can prepare the film pipe of even aperture distribution.So just need carry out sieve classification to powder material.
(3) prior art can't prepare the porous non layer boundary gradient metal film pipe of complete distribution gradient.And powder granule changes continuously, and the metal film pipe that promptly has gradient-structure is the first-selection of industrial film.
The patent No. is the Chinese invention patent of ZL00117221.2: gradient ceramic-film tube and preparation method thereof, announced a kind of one-time formed ceramic-film tube and preparation method thereof, be one or more hybrid ceramic powder in diatomite, zirconia, aluminium oxide, the silica but its base-material adopts, different fully with the metal-powder base-material that the present invention adopts.The material that this patent adopts is a ceramic powder.Because material is no matter the gradient ceramic-film tube that this method forms is in intensity, sealing property, fragility, heat conductivity several respects its weakness to be arranged all.
Summary of the invention
The objective of the invention is provides a kind of preparation method of porous non layer boundary gradient metal film pipe in the problem that overcomes the existence aspect preparing of above-mentioned ceramic-film tube and existing metal film pipe.Another object of the present invention provides a kind of non layer boundary gradient metal film pipe.
Mechanism of the present invention: when adopting conventional method to prepare metal film or ceramic membrane, the screening of powder is very important, because have only powder material particle of uniform size, just may prepare the film pipe of even aperture distribution.So just very high to the requirement of powder material, therefore when metal film or ceramic membrane prepare, often all to carry out sieve classification to powder material voluntarily.And the present invention need not the metal-powder raw material is carried out classification when utilizing centrifugal casting to prepare porous non layer boundary gradient metal film pipe.Under action of centrifugal force, the powder granule that density is different can be made travel motion in the carrier slurry, and the bulky grain in the powder will be poly-partially to the cast inner surface because weight is bigger, and promptly the closer to the metal film pipe outer surface, particle is big more.Minimum particle then concentrates on the endosexine of metal film pipe.Because particle gets rid of up one by one during moulding, the film pipe of making like this is very fine and close.Be exactly in layer after the moulding, as the annual ring of big tree, being completely, gradient distributes.Its inside of film pipe of making under action of centrifugal force like this is not have pore or other defective.Even the appearance of last layer big slightly hole, the little metallic particles of following one deck will be blocked it at once, so its aperture of porous non layer boundary gradient metal film pipe of adopting the present invention to make is very even.As long as the particle in the raw material has the fine powder of some, just can obtain the enough little metal film pipe in key-course aperture.And the absolute distribution gradient of made metal film pipe.The film pipe internal surface is owing to its powder granule minimum, and the fenestra aperture of formation is also minimum, is key-course.
Select at the material of base-material, the fracture toughness of pottery generally is not more than 20MPam1/2, the fracture toughness of most ceramic materials is all less than 10MPam1/2, fracture toughness as aluminium oxide is 3.5-5MPam1/2, the little 1-2 of a fracture toughness order of magnitude than metal, so pottery especially porous ceramics is a fragility, more than the metal cracky.Aspect intensity, porous metals are more much better than than porous ceramics, with filtering accuracy is that the stainless steel porous material of 0.5 μ m is an example, its bending strength can reach 164MPa, and ceramic material, both having made is intensity aluminium oxide ceramics preferably wherein, and its bending strength is only less than 80MPa, and its bending strength does not also reach half of metal.In actual use, more be to consider the great pressure of these film pipe abilities, that is to say how many its breakdown pressures is.To crush bad pressure in the pipe fitting is example, crushes bad pressure greater than 2.5MPa in the pipe fitting of stainless steel porous material, nickel greater than 1MPa, monel greater than 1.5MPa, the wall thickness of above-mentioned metal porous pipe fitting is 1-3mm.The wall thickness of porous ceramic pipe is thicker than the metal tube, even when adopting the flowing to of ecto-entad, operating pressure generally all is not more than 1MPa (to same pipe fitting, to crush bad pressure high about 4 times than interior for general its external pressure breakdown pressure), promptly the porous metals pipe in crush bad pressure ratio porous ceramic pipe the external pressure breakdown pressure also want big.In actual use, the film pipe all will form membrane filtration module by assembling and just can come into operation, and this just must solve the problem that is tightly connected of film pipe.Metal film pipe can weld nipple, adopts to be threaded, to seal, and sealing easily.And the general employing of ceramic-film tube is bonding, although the heat-resisting quantity of ceramic-film tube is good, the temperature tolerance of used bonding agent has limited its use in hot environment.The thermal conductivity factor of metallic nickel, stainless steel, titanium is respectively 91.4W/ (m. ℃), 15.2W/ (m. ℃), 22W/ (m. ℃), and the heat conductivity of ceramic material is poor, general insulation material adopts ceramic material exactly, aspect the heat conduction, the porous metals pipe has very remarkable advantages than porous ceramic pipe.No matter so be that still ceramic-film tube and metal film pipe of the present invention all have bigger gap on sealing property in mechanical strength, heat conduction.It is base-material that the present invention adopts metal-powder, and the porous non layer boundary gradient metal film pipe of preparation is compared with gradient ceramic-film tube with existing metal film pipe, and its distinctive advantage and advantage is all arranged.
Porous non layer boundary gradient metal film pipe preparation method of the present invention comprises the steps:
The first step is in parts by weight, with 50～70 parts base-material, and 30～50 parts of carriers, 0～0.4 part of binding agent mixes, and stirs and makes composite mortar in 2～4 hours; Described base-material is one or more the mixed metal powder in metallic nickel, titanium, stainless steel, bronze, copper, the iron; Described carrier is water or ethanol; Described compound binding agent is that polypropylene mills amine, sodium carboxymethylcellulose, polyvinyl alcohol, gum arabic or Ludox;
The composite mortar that second step obtained the first step is injected in the metal cast that rotating speed is 1000rpm～12000rpm, rotates 1～20 minute, and centrifugal forming is made the metal film pipe green compact;
The 3rd step green compact drying rear demoulding under reduction or vacuum atmosphere, through 650-1250 ℃ sintering temperature, is incubated cooling after 1～2 hour again, makes porous non layer boundary gradient metal film pipe.
What the mould among the present invention was used is rigidity casts such as stainless steel, copper alloy, pipe die be integral cannula formula or two halves formula split the folding mould.
The metal film pipe fenestra pore-size distribution of the present invention's preparation is to distribute inner surface aperture minimum, outer surface aperture maximum by outwards being continuous gradient in the pipe.The fenestra aperture is 0.1-5 μ m, and film pipe porosity is 30-60%, diameter 5-300mm, and length 10-2000mm, wall thickness are 2-5mm.
The present invention compared with prior art has following advantage:
(1) can prepare the metal film pipe that complete gradient distributes, and preparation and sintering all are once to finish.
The film pipe densification of (2) making, inner pore-free or other defective.As long as the particle in the raw material has the fine powder of some, just can obtain the enough little metal film pipe in key-course aperture.
(3) recoil property is good, distributes because the aperture is a gradient, and from outside to inside, the filter cake of filtrate can be deposited on bigger film pipe outer wall one side in aperture during filtration, because filtration channel is a gradient, recoil is easy to just filter cake to be washed out from inside to outside.
(4) porosity height, its size evenly also can be regulated by preparation technology in the aperture.
Description of drawings
Fig. 1 is a porous non layer boundary gradient metal film pipe cross section structure schematic diagram of the present invention.
Fig. 2 is Fig. 1 arbitrary section partial enlarged drawing.
The specific embodiment
Below in conjunction with accompanying drawing, be described in further detail the present invention by embodiment, but embodiments of the present invention are not limited to following manner.
Embodiment 1:
With parts by weight is 60 parts, and average grain diameter is 3 μ m metal nickel powder base-materials, and parts by weight are that the polyacrylamide binding agent that 40 parts carrier water and parts by weight are 0.2 part mixes, and are mixed with composite mortar, through 3 hours mechanical agitation, make uniform slurry.Start centrifugal forming metal film pipe machine, composite mortar is injected in the stainless steel cast of rotation at a high speed, the cast rotating speed is 10000rpm, under action of centrifugal force, the metal nickel powder particle can be made travel motion in the carrier slurry, the bulky grain in the powder will be poly-partially to the cast inner surface because quality is bigger, promptly the closer to the metal film pipe outer surface, particle is big more; Minimum particle then concentrates on the endosexine of metal film pipe, because its powder granule minimum, the fenestra aperture of formation is also minimum, and the endosexine is exactly a key-course so.As shown in Figure 1, 2, the carrier 1 of the continuous non layer boundary gradient variation in aperture does not have stratum boundary with the control rete 2 of minimum-value aperture.The metal nickel powder granular size gradually changes in the slurry, and the size of particle is exactly descending gradually changing on the film tube section, does not have the stratum boundary between layer and the layer, and the fenestra of made metal film pipe is with regard to distribution gradient.By centrifugal forming, dehydration, rotate and make porous non layer boundary gradient nickel film pipe green compact after 20 minutes, green compact through demoulding after drying, under vacuum atmosphere sintering, film pipe sintering temperature is 750 ℃, temperature retention time 1 hour promptly obtains porous non layer boundary gradient metallic nickel film pipe after the cooling.After testing, gained metallic nickel film management and control preparative layer fenestra aperture is 0.2 μ m, film pipe porosity 41%, and diameter 25mm, length 500mm, the film tube thickness is 3mm.Crush bad pressure greater than 1MPa in this nickel metal film pipe, can be used for the micro-filtration of liquid, gas, as remove bacterium, algae and other suspended contaminant in the running water, obtain aseptic water capable of direct drinking.Also can be used for the purification of air, remove pollutants such as airborne bacterium, dust, obtain filtrated air.
Embodiment 2:
With parts by weight is 70 parts, average grain diameter is 40 μ m metallic titanium powder base-materials, and parts by weight are that the sodium carboxymethylcellulose binding agent that 30 parts carrier water and parts by weight are 0.1 part mixes, and are mixed with composite mortar, through 2 hours mechanical agitation, make uniform slurry.Start centrifugal forming metal film pipe machine, composite mortar is injected in the stainless steel cast of rotation at a high speed, the cast rotating speed is 8000rpm.Under action of centrifugal force, the metallic titanium powder particle can be made travel motion in the carrier slurry, and the bulky grain in the powder will be poly-partially to the cast inner surface because quality is bigger, and promptly the closer to the metal film pipe outer surface, particle is big more; Minimum particle then concentrates on the endosexine of metal film pipe, because its powder granule minimum, the fenestra aperture of formation is also minimum, and the endosexine is exactly a key-course so.As shown in Figure 1, 2, the carrier 1 of the continuous non layer boundary gradient variation in aperture does not have stratum boundary with the control rete 2 of minimum-value aperture.Because the metallic titanium powder granular size gradually changes in the slurry, the size of particle is exactly descending gradually changing on the film tube section, does not have the stratum boundary between layer and the layer, and the fenestra of made metal film pipe is with regard to distribution gradient.By centrifugal forming, dehydration, rotate and make porous non layer boundary gradient titanium film pipe green compact after 10 minutes, green compact through demoulding after drying, under reducing atmosphere sintering, film pipe sintering temperature is 1250 ℃, temperature retention time 2 hours promptly obtains porous non layer boundary gradient titanium film pipe after the cooling.After testing, gained porous non layer boundary gradient titanium film management and control preparative layer fenestra aperture is 2.0 μ m, film pipe porosity 35%, and diameter 50mm, length 1000mm, the film tube thickness is 3mm.Crush bad pressure in this porous non layer boundary gradient titanium pipe and can reach 1MPa, can be used for the coarse filtration of water, dusty gas,, alleviate the burden of follow-up water treatment as removing the solid suspended contaminant in anhydrating.Also can be used for removing the pollutants such as dust in the dusty gas, good dust removing effects is arranged.
Embodiment 3:
With parts by weight is 50 parts, and average grain diameter is 80 μ m stainless steel powders, and parts by weight are that the polyvinyl alcohol binding agent that 50 parts carrier ethanol and parts by weight are 0.1 part mixes, and are mixed with composite mortar, through 2 hours mechanical agitation, make uniform slurry.Start centrifugal forming metal film pipe machine, composite mortar is injected in the stainless steel cast of rotation at a high speed, the cast rotating speed is 2000rpm.Under action of centrifugal force, the stainless steel powder particle can be made travel motion in the carrier slurry, and the bulky grain in the powder will be poly-partially to the cast inner surface because quality is bigger, and promptly the closer to the metal film pipe outer surface, particle is big more; Minimum particle then concentrates on the endosexine of metal film pipe, because its powder granule minimum, the fenestra aperture of formation is also minimum, and the endosexine is exactly a key-course so.As shown in Figure 1, 2, the carrier 1 of the continuous non layer boundary gradient variation in aperture does not have stratum boundary with the control rete 2 of minimum-value aperture.Because the stainless steel powder granular size gradually changes in the slurry, the size of particle is exactly descending gradually changing on the film tube section, does not have the stratum boundary between layer and the layer, and the fenestra of made metal film pipe is with regard to distribution gradient.By centrifugal forming, dehydration, rotate and make porous non layer boundary gradient titanium film pipe green compact after 20 minutes, green compact through demoulding after drying, under vacuum atmosphere sintering, film pipe sintering temperature is 1150 ℃, temperature retention time 3 hours promptly obtains porous non layer boundary gradient stainless steel membrane pipe after the cooling.After testing, gained stainless steel membrane management and control preparative layer fenestra aperture is 5 μ m, film pipe porosity 50%, and diameter 350mm, length 2000mm, the film tube thickness is 5mm.Crush bad pressure in this porous non layer boundary gradient stainless steel membrane pipe and can reach 1MPa, be used to contain the waste water recovery of solid powder, the solid powder in the energy effectively catching water is for recycling, but and the water reuse after this film pipe filters.
Embodiment 4:
With parts by weight is 70 parts, and average grain diameter is 0.5 μ m copper powder, and parts by weight are that the gum arabic binding agent that 30 parts carrier water and parts by weight are 0.3 part mixes, and are mixed with composite mortar, through 4 hours mechanical agitation, make uniform slurry.Start centrifugal forming metal film pipe machine, composite mortar is injected in the stainless steel cast of rotation at a high speed, the cast rotating speed is 12000rpm, under action of centrifugal force, the copper powder particle can be made travel motion in the carrier slurry, the bulky grain in the powder will be poly-partially to the cast inner surface because quality is bigger, promptly the closer to the metal film pipe outer surface, particle is big more; Minimum particle then concentrates on the endosexine of metal film pipe, because its powder granule minimum, the fenestra aperture of formation is also minimum, and the endosexine is exactly a key-course so.As shown in Figure 1, 2, the carrier 1 of the continuous non layer boundary gradient variation in aperture does not have stratum boundary with the control rete 2 of minimum-value aperture.Because the copper powder granular size gradually changes in the slurry, the size of particle is exactly descending gradually changing on the film tube section, does not have the stratum boundary between layer and the layer, and the fenestra of made metal film pipe is with regard to distribution gradient.By centrifugal forming, dehydration, rotate and make porous non layer boundary gradient copper film pipe green compact after 2 minutes, green compact through demoulding after drying, under reducing atmosphere sintering, film pipe sintering temperature is 650 ℃, temperature retention time 1 hour promptly obtains porous non layer boundary gradient metal copper film pipe after the cooling.After testing, gained metal copper film management and control preparative layer fenestra aperture is 0.1 μ m, film pipe porosity 45%, and diameter 35mm, length 500mm, the film tube thickness is 3mm.This porous non layer boundary gradient stainless steel membrane pipe can reach 1MPa, can be used for compressed-air actuated degerming, obtains the pure air of 1000～100 grades of cleanliness factors.
Embodiment 5:
Meter is 10 μ m iron powders with 55 parts of average grain diameters by weight, and the silica sol binder of 45 parts of carrier water and 0.4 part mixes, and is mixed with composite mortar, through 4 hours mechanical agitation, makes uniform slurry.Start centrifugal forming metal film pipe machine, composite mortar is injected in the stainless steel cast of rotation at a high speed, the cast rotating speed is 6000rpm, under action of centrifugal force, ferrous powder granules can be made travel motion in the carrier slurry, the bulky grain in the powder will be poly-partially to the cast inner surface because quality is bigger, promptly the closer to the metal film pipe outer surface, particle is big more; Minimum particle then concentrates on the endosexine of metal film pipe, because its powder granule minimum, the fenestra aperture of formation is also minimum, and the endosexine is exactly a key-course so.Because the ferrous powder granules size gradually changes in the slurry, the size of particle is exactly descending gradually changing on the film tube section, does not have the stratum boundary between layer and the layer, and the fenestra of made metal film pipe is with regard to distribution gradient.By centrifugal forming, dehydration, rotate and make porous non layer boundary gradient iron film pipe green compact after 10 minutes, green compact through demoulding after drying, under reducing atmosphere sintering, film pipe sintering temperature is 1250 ℃, temperature retention time 2 hours promptly obtains porous non layer boundary gradient metallic iron film pipe after the cooling.After testing, gained metallic iron film management and control preparative layer fenestra aperture is 0.5 μ m, film pipe porosity 20%, and diameter 100mm, length 1000mm, the film tube thickness is 4mm.
Embodiment 6:
With parts by weight 60 is part, and average grain diameter is 3 μ m metal nickel powder base-materials, and the carrier water of 40 parts by weight and the polyacrylamide binding agent of 0.2 parts by weight mix, and are mixed with composite mortar, through 3 hours mechanical agitation, make uniform slurry.Start centrifugal forming metal film pipe machine, composite mortar is injected in the stainless steel cast of rotation at a high speed, the cast rotating speed is 10000rpm, under action of centrifugal force, the metal nickel powder particle can be made travel motion in the carrier slurry, the bulky grain in the powder will be poly-partially to the cast inner surface because quality is bigger, promptly the closer to the metal film pipe outer surface, particle is big more; Minimum particle then concentrates on the endosexine of metal film pipe, because its powder granule minimum, the fenestra aperture of formation is also minimum, and the endosexine is exactly a key-course so.Because the metal nickel powder granular size gradually changes in the slurry, the size of particle is exactly descending gradually changing on the film tube section, does not have the stratum boundary between layer and the layer, and the fenestra of made metal film pipe is with regard to distribution gradient.By centrifugal forming, dehydration, rotate and make porous non layer boundary gradient nickel film pipe green compact after 20 minutes, green compact through demoulding after drying, under vacuum atmosphere sintering, film pipe sintering temperature is 750 ℃, temperature retention time 1 hour promptly obtains porous non layer boundary gradient metallic nickel film pipe after the cooling.After testing, gained metallic nickel film management and control preparative layer fenestra aperture is 0.2 μ m, film pipe porosity 41%, and diameter 5mm, length 50mm, the film tube thickness is 1mm.Crush bad pressure greater than 1MPa in this nickel metal film pipe, can make laboratory micro-filtration membrane pipe.As be suitable in experiment, removing bacterium, algae and other suspended contaminant in the running water, obtain testing required sterilized water.Also can be used for the compressed-air actuated purification of small-sized air compressor, remove pollutants such as airborne bacterium, dust, obtain the required filtrated air of experiment.
Embodiment 7:
Meter is the mixture of 8 μ m metallic titanium powder and metal nickel powder with 55 parts of average grain diameters by weight, and the carrier water of 40 parts by weight and 0.2 part polyvinyl acetate binding agent mix, and are mixed with composite mortar, through 4 hours mechanical agitation, make uniform slurry.Start centrifugal forming metal film pipe machine, composite mortar is injected in the stainless steel cast of rotation at a high speed, the cast rotating speed is 8000rpm, under action of centrifugal force, the hybrid metal powder particles can be made travel motion in the carrier slurry, the particle that the quality in the powder is big, particle is big will be poly-partially to the cast inner surface because quality is bigger, promptly the closer to the metal film pipe outer surface, particle is big more; The Titanium particle particle minimum, the quality minimum then concentrates on the endosexine of metal film pipe, because its powder granule minimum, the fenestra aperture of formation is also minimum, and the endosexine is exactly a key-course so.Because metal mixed powder particles size gradually changes in the slurry, and the density difference of two kinds of metal powders, two kinds of metal powders of carrier part on the film tube section outside the internal control preparative layer are continuously shaped, do not have the stratum boundary between layer and the layer, the fenestra distribution gradient of made metal film pipe.By centrifugal forming, dehydration, rotate and make porous non layer boundary gradient Ni-Ti film pipe green compact after 10 minutes, green compact through demoulding after drying, under reducing atmosphere sintering, film pipe sintering temperature is 1000 ℃, temperature retention time 2 hours promptly obtains porous non layer boundary gradient metallic nickel-titanium film pipe after the cooling.After testing, gained metallic iron film management and control preparative layer fenestra aperture is 0.3 μ m, film pipe porosity 44%, and diameter 150mm, length 250mm, the film tube thickness is 1mm.Can be used for the micro-filtration of fluid and be used as membrane reactor.
Claims (5)
1, a kind of preparation method of porous non layer boundary gradient metal film pipe is characterized in that comprising the steps and process conditions:
The first step is the base-material of 50-70 part with parts by weight, 30-50 part carrier, and 0-0.4 part binding agent mixes, and stirs and makes composite mortar in 2～4 hours; Described base-material is one or more the mixed metal powder in metallic nickel, titanium, stainless steel, bronze, copper, the iron; Described carrier is water or ethanol;
The composite mortar that second step obtained the first step is injected in the metal cast that rotating speed is 2000rpm～12000rpm, rotates 2～20 minutes, and centrifugal forming is made the metal film pipe green compact;
The 3rd step green compact drying rear demoulding, under reduction or vacuum atmosphere, temperature is a 650-1250 ℃ of sintering, is incubated cooling after 1～3 hour, makes porous non layer boundary gradient metal film pipe.
2, the preparation method of porous non layer boundary gradient metal film pipe according to claim 1 is characterized in that described compound binding agent is polyacrylamide, sodium carboxymethylcellulose, polyvinyl alcohol, gum arabic, Ludox or polyvinyl acetate.
3, a kind of porous non layer boundary gradient metal film pipe is prepared from by the described method of claim 1.
4, porous non layer boundary gradient metal film pipe according to claim 3, it is characterized in that: described porous non layer boundary gradient metal film is to be continuous gradient from inside to outside along the film caliber to distribute, inner surface forms control rete, aperture minimum, outer surface aperture maximum.
5, according to claim 3 or 4 described porous non layer boundary gradient metal film pipes, it is characterized in that: aperture, controlling diaphragm tunic hole is 0.1～5 μ m, and film pipe porosity is 20～50%, diameter 5～350mm, and length 50～2000mm, wall thickness are 1～5mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101249389B (en) * | 2008-03-31 | 2010-06-02 | 徐小平 | Metallic filtering film with antisymmetric structure and method of preparing the same |
| CN102039412A (en) * | 2011-01-20 | 2011-05-04 | 北京科技大学 | Method for carrying out gel centrifugal forming on metal parts |
| CN101433807B (en) * | 2008-12-05 | 2011-05-11 | 西北有色金属研究院 | Method for optimizing filtering quality of metal porous membrane tube |
| CN103894075A (en) * | 2014-03-07 | 2014-07-02 | 中南大学 | Heterogeneous composite ceramic with gradient holes and preparation method for ceramic |
| CN105268247A (en) * | 2014-07-23 | 2016-01-27 | 上海一鸣过滤技术有限公司 | Nanoscale porous metal filter medium and preparation method thereof |
| CN106390763A (en) * | 2016-11-30 | 2017-02-15 | 佛山市高明区诚睿基科技有限公司 | Preparation method of stainless steel filtering membrane pipe |
| CN107020021A (en) * | 2017-03-09 | 2017-08-08 | 长沙理工大学 | Preparation method of multilayer titanium-nickel alloy filtering membrane |
| CN112044286A (en) * | 2020-09-08 | 2020-12-08 | 山东谷雨春生物科技有限公司 | Metal porous membrane tube and preparation method and application thereof |
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2005
- 2005-03-18 CN CN 200510033633 patent/CN1686599A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249389B (en) * | 2008-03-31 | 2010-06-02 | 徐小平 | Metallic filtering film with antisymmetric structure and method of preparing the same |
| CN101433807B (en) * | 2008-12-05 | 2011-05-11 | 西北有色金属研究院 | Method for optimizing filtering quality of metal porous membrane tube |
| CN102039412A (en) * | 2011-01-20 | 2011-05-04 | 北京科技大学 | Method for carrying out gel centrifugal forming on metal parts |
| CN103894075A (en) * | 2014-03-07 | 2014-07-02 | 中南大学 | Heterogeneous composite ceramic with gradient holes and preparation method for ceramic |
| CN103894075B (en) * | 2014-03-07 | 2015-10-28 | 中南大学 | A kind of heterogeneous body composite ceramics and preparation method with gradient pore |
| CN105268247A (en) * | 2014-07-23 | 2016-01-27 | 上海一鸣过滤技术有限公司 | Nanoscale porous metal filter medium and preparation method thereof |
| CN106390763A (en) * | 2016-11-30 | 2017-02-15 | 佛山市高明区诚睿基科技有限公司 | Preparation method of stainless steel filtering membrane pipe |
| CN106390763B (en) * | 2016-11-30 | 2018-12-28 | 佛山市高明区诚睿基科技有限公司 | A kind of preparation method of stainless steel filtering membrane tube |
| CN107020021A (en) * | 2017-03-09 | 2017-08-08 | 长沙理工大学 | Preparation method of multilayer titanium-nickel alloy filtering membrane |
| CN112044286A (en) * | 2020-09-08 | 2020-12-08 | 山东谷雨春生物科技有限公司 | Metal porous membrane tube and preparation method and application thereof |
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