CN102962464B - Asymmetrical stainless steel filter membrane tube and production method thereof - Google Patents
Asymmetrical stainless steel filter membrane tube and production method thereof Download PDFInfo
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- CN102962464B CN102962464B CN201210470800.0A CN201210470800A CN102962464B CN 102962464 B CN102962464 B CN 102962464B CN 201210470800 A CN201210470800 A CN 201210470800A CN 102962464 B CN102962464 B CN 102962464B
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Abstract
The invention provides an asymmetrical stainless steel filter membrane tube and a production method thereof. The asymmetrical stainless steel filter membrane tube produced by the production method for the asymmetrical stainless steel filter membrane tube comprises a support layer and a control layer and is characterized by further comprising stainless steel fiber felts between the support layer and the control layer. According to the asymmetrical stainless steel filter membrane tube disclosed by the invention, the stainless steel fiber felts are additionally arranged among different powder layers, so that the filtering precision and the filtering performance of the filtering tube in performance are ensured; and meanwhile, the problems of cracking, peeling and the like of the stainless steel filter membrane with mutant fluctuant gradient in the sintering process are solved to the great degree.
Description
Technical field
The present invention relates to a kind of metal filtration pipe and preparation method thereof, be specifically related to a kind of asymmetric stainless steel filtering membrane tube and preparation method thereof.
Background technology
Metal polyporous material is as the important a member in porous material family, be widely used in the functional areas such as the filtration in the fields such as petrochemical industry, the energy, environmental protection, food, pharmacy, separation, fluid distrbution with the performance of its uniqueness, and be the indispensable critical material of above-mentioned industrial realization technological break-through.Metal polyporous material good penetrability, hole and aperture are controlled, dimensionally stable, high temperature resistant, can regenerate, can process, be the class functional material that some other porous material of special industry field cannot replace.
Along with the fast development of modern industry, more and more higher to the requirement of filtering material performance, even porous material, as filtering the matrix of rete, can not meet that some department is ventilative greatly, high-precision performance requirement.Under the diactinic prerequisite of guarantee porous metals filtering material, for improving its filtering accuracy, usually coat one or more layers perforated membrane to improve its filtering accuracy at porous material surface.Based on this thought, a lot of patent discloses the preparation method of such material successively, such as application number be CN200610137991.3, CN200710035404.4,200810232586.4 and CN200910187849.3 just propose the preparation method of unsymmetrical metal filtering membrane tube.For continuous gradient metallic filtering film Guan Eryan, due to the mutual suppression of sintering stress between different powder gradient layer, and then easily realize synchronous sintering (co-sintering), avoid the generation of material cracks phenomenon, but the preparation technology of continuous gradient filtering membrane tube relatively complicated (see patent CN101428346), yield rate is low, is difficult to the industrial production realizing scale; It is then the difficult problem being difficult in gradient filtration film pipe preparation process avoid of suddenling change that rete and supporting layer occur to ftracture in sintering process.Therefore, how selecting appropriate forming method and sintering process, avoid material cracks, is the key successfully preparing sudden change graded metal filtering membrane tube.
The performance requirement of development to metal polyporous material of modern industry is more and more higher, and such as military service performance, require that filtering accuracy is more and more higher, transmitance is increasing; In pore property, require that aperture is more and more less, porosity is increasing; The mechanical properties such as heat-conductivity conducting rate will be got well, anticorrosive, antifatigue want high.Such as, juice clarification needs filtering accuracy to be the porous material of 0.2-0.5 μm, microorganism is separated to filter with cell fragment needs filtering accuracy to be the porous material of 0.2-1.6 μm, blood plasma is separated and degerming in dairy industry, the concentrated filtering accuracy that then needs is the porous material of 0.1-1 μm, gas cleaning at high temperature requires high temperature resistant, corrosion-resistant, and fuel cell electrode needs high conductivity, high-specific surface area etc.But, there is mutual restriction between some military service performance and pore properties, if the compressive resistance of material and through performance are conflicts: screen pipe tube wall is thicker, and its compressive resistance is higher, and permeability is poorer; Large discharge and high accuracy are also conflicts for porous material: aperture is less, and the filtering accuracy of material is higher, and fluid transit dose is less.Asymmetric apertures structural porous material is utilized effectively to address this problem.At present, for graded metal multi-hole filtering film pipe, ensure people under diactinic prerequisite usually utilize porous metal film pipe matrix surface spraying or brush the control that one deck pottery or metal porous membrane realize filtering accuracy, or directly prepare continuous gradient metallic filtering film pipe by centrifugal deposition method, but all there is certain shortcoming in these methods, such as, ceramic membrane on porous metal film pipe matrix its intensity after co-sintering is not high, in use easily there is obscission, cause life of product short, and it is poor with the machining property of the multi-hole filtering film pipe of ceramic membrane compound, in addition, centrifugal deposition legal system is more complicated for the method for metallic filtering film pipe, is also not suitable for the industrial production of scale.
As mentioned above, unsymmetrical metal filtering membrane tube can be divided into Catastrophe and evolution graded pore structure two kinds.Sudden change (also known as stepped---have obvious material interface) bore diameter gradient porous material is all filter key-course or transition zone is attached on the supporter of front one deck macropore, and this kind of material is metal membrane material above-mentioned.By changing forming method and sintering process, control the thickness of metallic diaphragm, the preparation of this type of material can be completed, such as application number is 201210024816.9 preparation methods that then provides a kind of graded metal filter that suddenlys change, and this patent relates to a kind of preparation method of the gradient filtration film pipe that suddenlys change.The asymmetric stainless steel filtering membrane tube prepared by this patent in guarantee compared with under the prerequisite of high filtering precision, can make it have excellent through performance.
Summary of the invention
The object of this invention is to provide a kind of unsymmetrical metal filtering membrane tube of applicable large-scale production and preparation method thereof.For solving the problems of the technologies described above, the technical solution used in the present invention relates generally to a kind of asymmetric stainless steel filtering membrane tube and preparation method thereof, it is characterized in that preparation process is: (1), adding a small amount of resin respectively in that be sieving through, varigrained thick, thin powder of stainless steel, mixes; (2) in mould, introduce stainless steel fibre felt, fix plug and gum cover; (3) first take corase meal and the fine powder of certain mass in step (1), shaping of then feeding, must ensure that in charging process corase meal and fine powder powder high-sequential in a mold alternately increase, to ensure the uniformity of different powder Thickness of Gradient Layer.Meal last layer is screen pipe supporting layer, and fine powder last layer is screen pipe precision controlling layer; Can the position (inwall of screen pipe or outer wall) of choice accuracy key-course according to actual condition situation; (4) the screen pipe semi-finished product obtained in step (3) are put in cold isostatic press compressing; (5) asymmetric stainless steel screen pipe green compact step (4) finally obtained carry out the demoulding; (6) the asymmetric stainless steel screen pipe green compact obtained through step (5) sinter at vacuum drying oven or in hydrogen furnace, heating rate is 2 ~ 10 DEG C/min, sintering temperature is 1150 ~ 1250 DEG C, is incubated 1 ~ 4 hour, namely obtains asymmetric stainless steel filtering membrane tube after cooling.
Pressing pressure in described step (4) is for being 15 ~ 30 MPa;
During sintering in hydrogen furnace in described step (6), sintering gas is hydrogen or inert gas, as argon gas, and nitrogen etc.
According to the asymmetric stainless steel filtering membrane tube that the preparation method of described asymmetric stainless steel filtering membrane tube obtains, comprise supporting layer 1, key-course 3, be also included in the stainless steel fibre felt 2 between supporting layer and key-course.
For the manufacture of a mould for described asymmetric stainless steel filtering membrane tube, comprise charging door 1, charging door 2, plug 5, be also included in and be provided with one for placing the groove 7 of stainless steel fibre felt bottom mould.
The screening of powder particle is the important step preparing metal polyporous material.When preparing conventional metal polyporous material, the powder of certain granules Size Distribution will be selected according to the requirement of strainability, usually the bulky grain in this polyporous materials is mixed and disorderly mixing with granule, the sintering shrinkage of such material various piece when sintering is identical substantially, sintering warpage is less likely to occur material, but the high filtering accuracy of homogeneous metal porous material and high through performance can not reach simultaneously.The technology path key that this method relates to is: the corase meal and the fine powder that are obtained narrower particle size distribution by screening, in above-mentioned charging process, stainless steel fibre felt is introduced between meal last layer (base layer) and fine powder last layer (key-course), can realize asymmetric stainless steel filtering membrane tube shaping of key-course in screen pipe outer wall or inwall two type, the special sintering technique then utilizing this method to relate to finally realizes the preparation of finished product filtering membrane tube.As the transition zone between filtering membrane tube base layer and key-course, stainless steel fibre felt, performance both ensure that filtering accuracy and the through performance of screen pipe, also largely solved the problem such as cracking, peeling that sudden change gradient stainless steel filtering membrane tube occurs in sintering process simultaneously.
For in practical application to the thickness requirement of metallic filtering film pipe, the present invention is by selecting the metal dust of different grain size classification, and under the prerequisite ensureing strainability, its thickness also can obtain precision controlling; For in practical application to the strainability requirement of metallic filtering film pipe, when thickness and powder size are fixing, can realize regulating strainability by regulating the relative thickness of base layer and key-course.The present invention, while guarantee metal filtering membrane tube filtering accuracy, improves the air transmission coefficient of non-gradient stainless steel filtering membrane tube; The asymmetric stainless steel filtering membrane tube of preparation is once sintered shaping, and required cost is lower than having the preparation cost that metal film or ceramic membrane are the asymmetric stainless steel filtering membrane tube of filtering accuracy key-course; The sintering process carrying out low speed intensification at a certain temperature that this method relates to can effectively improve sintering finished rate, avoids the generation of cracking phenomena in sintering process.
The feature of this preparation method is also in the charging procedure of asymmetric stainless steel filtering membrane tube preparation process, have employed the charging mould of moulding process particular design for this reason: adopt this mould can the thickness of accurately controlled filter pipe supporting layer and precision controlling layer, and then ensure the performance of screen pipe.
Below by drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of asymmetric stainless steel filtering membrane tube;
Fig. 2 is the structural representation (front view) of asymmetric stainless steel filtering membrane tube; Fig. 3 is the structural representation that the forming method adopting this patent to relate to prepares specific charging mould used in asymmetric stainless steel filtering membrane tube process.
Wherein: 1-supporting layer; 2-fibrofelt; 3-key-course; 4-charging door 1; 5-plug; 6-charging door 2; 7-groove (fibrofelt position).
Detailed description of the invention
embodiment 1by filtering accuracy be 20um stainless steel fibre felt load comprise charging door 1, (see figure 3) in the groove 7 of the mould of charging door 2 and plug, after good plug to be fixed and gum cover,-180 ~ 300 object powder of stainless steel are loaded in charging door 1, in charging door 2, load-300 object powder of stainless steel simultaneously, must ensure that in charging process corase meal and fine powder powder high-sequential in a mold alternately increase, to ensure the uniformity of different powder Thickness of Gradient Layer, the powder of charged is put in cold isostatic press compressing together with mould, then the demoulding is taken out, sinter these asymmetric stainless steel filtering membrane tube green compact in a vacuum furnace, sintering temperature is 1200 DEG C, carries out low speed at a certain temperature and heat up to prevent sample from ftractureing during sintering, finally obtain as depicted in figs. 1 and 2 comprise supporting layer 1, the asymmetric stainless steel filtering membrane tube of key-course 3 and stainless steel fibre felt 2.
embodiment 2by filtering accuracy be 20um stainless steel fibre felt load mould groove 7 in, see Fig. 3, after good plug to be fixed and gum cover,-180 ~ 340 object powder of stainless steel are loaded in charging door 1, in charging door 2, load-340 object powder of stainless steel simultaneously, must ensure that in charging process corase meal and fine powder powder high-sequential in a mold alternately increase, to ensure the uniformity of different powder gradient layer.The powder of charged is put in cold isostatic press compressing together with mould, then takes out the demoulding; Sinter these asymmetric stainless steel filtering membrane tube green compact in a vacuum furnace, sintering temperature is 1150 DEG C, carries out low speed at a certain temperature and heat up to prevent sample from ftractureing during sintering; Finally obtain asymmetric stainless steel filtering membrane tube.
embodiment 3by filtering accuracy be 20um stainless steel fibre felt load mould groove 7 in, see Fig. 3, after good plug to be fixed and gum cover,-300 object powder of stainless steel are loaded in charging door 1, in charging door 2, load-180 ~ 300 object powder of stainless steel simultaneously, must ensure that in charging process corase meal and fine powder powder high-sequential in a mold alternately increase, to ensure the uniformity of different powder gradient layer.Put the powder of charged into isostatic pressing machine together with mould compressing, then take out the demoulding; Sinter these asymmetric stainless steel filtering membrane tube green compact in hydrogen furnace atmosphere of hydrogen, sintering temperature is 1200 DEG C, carries out low speed at a certain temperature and heat up to prevent sample from ftractureing during sintering; Finally obtain asymmetric stainless steel filtering membrane tube.
Claims (5)
1. a preparation method for asymmetric stainless steel filtering membrane tube, its preparation process is: (1), adding a small amount of resin respectively in that be sieving through, varigrained thick, thin powder of stainless steel, mixes; (2) in mould, introduce stainless steel fibre felt, fix plug and gum cover; (3) corase meal and the fine powder of certain mass in step (1) is first taken, then to feed shaping, must ensure that in charging process corase meal and fine powder powder high-sequential in a mold alternately increase, to ensure the uniformity of different powder Thickness of Gradient Layer, meal last layer is screen pipe supporting layer, and fine powder last layer is screen pipe precision controlling layer; (4) the screen pipe semi-finished product obtained in step (3) are put in cold isostatic press compressing; (5) asymmetric stainless steel screen pipe green compact step (4) finally obtained carry out the demoulding; (6) the asymmetric stainless steel screen pipe green compact obtained through step (5) sinter in vacuum drying oven or hydrogen furnace, heating rate is 2 ~ 10 DEG C/min, sintering temperature is 1150 ~ 1250 DEG C, is incubated 1 ~ 4 hour, namely obtains asymmetric stainless steel filtering membrane tube after cooling.
2. the preparation method of a kind of asymmetric stainless steel filtering membrane tube according to claim 1, is characterized in that in step (4), pressing pressure is 15 ~ 30 MPa.
3. the preparation method of a kind of asymmetric stainless steel filtering membrane tube according to claim 1, is characterized in that the sintering gas of step (6) in hydrogen furnace is hydrogen or inert gas.
4. the asymmetric stainless steel filtering membrane tube that obtains of the preparation method of an asymmetric stainless steel filtering membrane tube according to claim 1 and 2, comprise supporting layer (1), key-course (3), is further characterized in that the stainless steel fibre felt (2) be also included between supporting layer and key-course.
5. the mould for the manufacture of a kind of asymmetric stainless steel filtering membrane tube described in claim 1 or 2, comprise charging door 1(4), charging door 2(6), plug (5), characterized by further comprising and be provided with one for placing the groove (7) of stainless steel fibre felt bottom mould.
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| 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 |
| CN109014219A (en) * | 2018-09-14 | 2018-12-18 | 河南德源净化装备有限公司 | A kind of production method of the powder sintered screen pipe of smooth outer surface type |
| CN109158607B (en) * | 2018-09-14 | 2020-06-30 | 河南德源净化装备有限公司 | Method for preparing enhanced metal powder sintered multilayer filter pipe |
| CN109365824B (en) * | 2018-10-25 | 2021-06-25 | 西安石油大学 | Preparation method of 6.5 wt% high-silicon electrical steel thin-wall hollow pipe |
| CN109364583A (en) * | 2018-10-25 | 2019-02-22 | 西安石油大学 | A kind of Industrial cleaning facility Ti-Ti6Si4The preparation method of outer wall light type metallic filtering film tubing |
| CN110508824A (en) * | 2019-08-23 | 2019-11-29 | 西安石油大学 | A kind of Ti-Ti5Si3Porous internal walls Gradient Film tube preparation method and its application |
| CN112828280B (en) * | 2021-01-06 | 2022-09-09 | 南京工业大学 | Preparation method of metal membrane with gradient pore diameter structure |
| CN116196771A (en) * | 2023-04-28 | 2023-06-02 | 成都华之煜新材料有限公司 | Preparation method of asymmetric porous metal film with high porosity |
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| CN100577330C (en) * | 2005-12-28 | 2010-01-06 | 西部金属材料股份有限公司 | Preparation method of composite filtering net of stainless steel net and metal fiber felt |
| EP2056985A4 (en) * | 2006-07-28 | 2012-03-07 | Univ California | Joined concentric tubes |
| CN100497089C (en) * | 2006-09-27 | 2009-06-10 | 北京航空航天大学 | Fibre-reinforced metal/ceramic sheet-like composite container casing and its manufacture method |
| CN101413071A (en) * | 2008-12-05 | 2009-04-22 | 西北有色金属研究院 | Metal polyporous material with gradient pore structure and preparation thereof |
| CN201735796U (en) * | 2010-08-20 | 2011-02-09 | 西北有色金属研究院 | Device for controlling the uniformity of wall thickness of powder antipriming pipe |
| CN102078962B (en) * | 2010-12-01 | 2012-12-26 | 成都易态科技有限公司 | Mould for forming multi-channel filter element and method for forming intermetallic compound multi-channel filter element |
| CN102029396B (en) * | 2010-12-06 | 2012-05-23 | 西北有色金属研究院 | Method for preparing integral type seamless metal fiber perforated pipe and tangling device |
| CN102489079A (en) * | 2011-12-30 | 2012-06-13 | 安泰科技股份有限公司 | Asymmetric metal filter core and preparation method thereof |
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