CN105435535A - Modified filter material and preparation method thereof - Google Patents

Modified filter material and preparation method thereof Download PDF

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Publication number
CN105435535A
CN105435535A CN201510847946.6A CN201510847946A CN105435535A CN 105435535 A CN105435535 A CN 105435535A CN 201510847946 A CN201510847946 A CN 201510847946A CN 105435535 A CN105435535 A CN 105435535A
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powder
filtering material
modification
modified layer
material body
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高麟
汪涛
李波
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Intermet Technology Chengdu Co Ltd
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Intermet Technology Chengdu Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing

Abstract

The invention discloses a modified filter material and a preparation method thereof. The modified filter material comprises a filter material body and a modification layer chemically connected with the filter material body, wherein the filter precision of the modification layer is higher than that of the filter material body; the thickness of the modification layer is 20-300 mu m, preferably, the thickness of the modification layer is 100-200 mu m, the average aperture is 1-14 mu m, and preferably, the average aperture is 3-10 mu m. The modification layer is connected with the filter material body through a middle layer, and the middle layer is obtained through reaction of the filter material body and powder sprayed to the surface of the filter material body; powder which does not react with the filter material body is converted into the modification layer. With the addition of the modification layer, the filter precision is improved by the aid of the smaller aperture of the modification layer relative to the filter material body; the filter material body is connected with the modification layer through the middle layer, so that the interaction force between the filter material body and the modification layer is high, and the modification layer is not prone to falling off.

Description

Modification filtering material and preparation method thereof
Technical field
The present invention relates to a kind of modification filtering material, also relate to the preparation method of this modification filtering material.
Background technology
At present, rigid filtration material such as tubular ceramic and metal filtering core make it be mainly used in the harsh corrosive environment of high temperature because its great number cost limits, as temperature >=400 DEG C.Therefore, in < 300 DEG C of low temperature systems, main employing lower-cost organic porous material, metal fiber felt and multi-layer sintering net.Although organic porous material has with low cost and that air permeability is large advantage, because it is formed by the braiding of the macromolecular material such as nylon, polypropylene, there is the intrinsic defect that aperture is large, filtering accuracy is low; In use easily occur burning bag, not only complex operation, had a strong impact on normalization production, production efficiency is low simultaneously simultaneously; The filtering materials such as metal fiber felt and multi-layer sintering net have the excellent properties such as high temperature resistant, corrosion-resistant, but it exists the major defect of filtering accuracy difference.At present, also untappedly go out a kind ofly have excellent resistance to elevated temperatures and high filtering precision concurrently and there is the novel filter material of low cost.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly has excellent high-temperature behavior and high filtering precision concurrently and have the novel filter material of low cost.The present invention also will provide the preparation method of this filtering material.
It is modification filtering material that the present invention solves the problems of the technologies described above adopted technical scheme, described modification filtering material comprises filtering material body, also comprise and the modified layer that is connected of filtering material body chemistry, the filtering accuracy of modified layer is higher than the filtering accuracy of filtering material body; The thickness of described modified layer is 20-300 μm, preferably 100-200 μm, and average pore size is 1-14 μm, preferably 3-10 μm.
The main cause of body rete filtering accuracy difference is that average pore size is larger, by increasing modified layer on its surface, the aperture utilizing modified layer less relative to filtering material body reaches the object promoting filtering accuracy, after larger particles in thing to be filtered filters by filtering material body, modified layer refilters the comparatively granule in thing to be filtered.The performance of thickness to modification filtering material of modified layer has a certain impact, and the thicker cost that not only can cause of modified layer is higher, and modified layer difficulty is fully utilized and not easy to clean, and the thinner meeting of modified layer causes cleaning frequent, reduction of service life.By chemical bond, filtering material body is connected with modified layer, makes the interaction force between filtering material body and modified layer strong, modified layer difficult drop-off.
As a further improvement on the present invention, described modified layer is connected with filtering material body by intermediate layer, and described intermediate layer is obtained by the powder and filtering material bulk reaction being sprayed at filtering material body surface; Be not converted into modified layer with the powder of filtering material bulk reaction.Between the intermediate layer obtained by in-situ chemical reaction and filtering material body and the Interaction Force of intermediate layer and modified layer strong, modified layer difficult drop-off.
As a further improvement on the present invention, described powder comprises the first powder and the second powder; Described intermediate layer is solid solution and/or intermetallic compound; Described modified layer is metal alloy porous material.Powder and filtering material bulk reaction not only generate the intermediate layer with connection function, and intermediate layer has certain aperture, can be used as the flow channel of thing to be filtered; The physico-chemical property temperature of solid solution and/or intermetallic compound, has good heat-resisting quantity, can promote the performance of modification filtering material further.Described first powder/the second powder is Ni powder/Cu powder, Fe powder/Al powder, Ti powder/Al powder, Cu powder/Zn powder, Fe powder/Cr powder, Mg powder/Cd powder, Ag powder/Au powder or Ti powder/Zr powder; When the first powder/the second powder is Ni powder/Cu powder, described modified layer is Ni-Cu alloy, and the solid solution in intermediate layer is the surface that Cu and Ni is solid-solution in filtering material body, and intermetallic compound is NiCu and/or NiCrFe.The composition in intermediate layer was determined by powder and forming of filtering material body.Described second powder accounts for the 1%-28% of powder gross mass, preferably 10%-20%.
The pre-configured form slurry of described powder, then sprays to filtering material body surface, and described slurry contains the proportioning preparation of 1-5g thermoplastic resin, 50-90g powder according to every 100mL alcohol solution.The slurry configured needs to make powder lot dispersing even, and the viscosity of slurry meets can in filtering material body surface film forming.Described thermoplastic resin comprises at least one in PE, PVC, PVB, PS, PA, PC; Described alcohols is methyl alcohol, ethanol, normal propyl alcohol, at least one in isopropyl alcohol; Described thermoplastic resin can be dissolved in described alcohols and form uniform dispersion liquid.
As a further improvement on the present invention, described filtering material body is sintered metal mesh or felt-metal, and its average pore size is 15-30 μm, air flux is 500-2000m 3/ m 2hKPa, material is steel alloy.The thickness of felt-metal is 0.6-2.5mm, is preferably 0.6-1.2mm; The thickness of sintered metal mesh is 0.5-3mm, is preferably 1-1.5mm.The material of described sintered metal mesh or felt-metal can select 304 types, 316 types or 316L type steel alloy, this kind of filtering material has the excellent properties such as high temperature resistant, corrosion-resistant, but it exists the major defect of filtering accuracy difference, there is no a kind of scheme promoting this kind of filtration of material precision at present yet.
The preparation method of modification filtering material, comprise the following steps: the proportioning preparation slurry 1) containing 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, the equal particle diameter of Ni powder peace that described powder is 3-5 μm by average grain diameter is that the Cu powder of 5-10 μm forms, and wherein the percentage by weight of Cu powder is 1%-28%; 2) filtering material body at least one side spraying slurry and at 50-120 DEG C dry 2-6h, described filtering material body is sintered metal mesh or felt-metal, and average pore size is 15-30 μm, material is steel alloy; 3) segmented sintering process: the sintering temperature of first stage is 120-300 DEG C, insulation 120-180min, programming rate is 1-20 DEG C/min, and its effect is slowly removed by moisture remaining in slurry, evades moisture and volatilizees fast and cause film to ftracture and cavitation; The sintering temperature of second stage is 500-700 DEG C, insulation 90-240min, and programming rate is 1-5 DEG C/min, and the effect in this stage removes PVB and reaction pore-creating; The sintering temperature of phase III is 900-1100 DEG C, insulation 90-180min, and programming rate is 1-10 DEG C/min, and its effect promotes pore-creating and generates intermetallic compound.4), after having sintered, cool and obtain described modification filtering material.Being controlled the thickness of modified layer by the thickness controlling slurry spraying, controlling the aperture of modified layer by controlling sintering time.
Modification filtering material of the present invention has the advantage of filtering material body and modified layer concurrently, namely while the excellent high temperature resistance performance keeping filtering material body and decay resistance, increase modified layer by simple modified technique, modification filtering material filtering accuracy is significantly promoted.The preparation technology of modification filtering material is simple, cost is low, and the range of choice of modified layer composition material is large, can the multiple filtering material body of modification, the modification filtering material Stability Analysis of Structures that modification obtains, filtering accuracy has remarkable lifting compared with the filtering accuracy of filtering material body.
Detailed description of the invention
Embodiment 1
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 1wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(average pore size is 15 μm, and air flux is 500m to adopt the felt-metal of 304 steel alloy materials 3/ m 2hKPa, thickness is 0.6mm) be filtering material body, be coated on felt-metal body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of felt-metal body spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 120 DEG C from room temperature, insulation 180min; Second stage: rise to 500 DEG C from 120 DEG C, insulation 240min; Phase III: rise to 1050 DEG C from 500 DEG C, insulation 90min; Heating rate in whole sintering process is 5 DEG C/min.
Namely obtain modification felt-metal filtering material after having sintered, wherein intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of felt-metal body), and modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 300 μm, and average pore size is 1 μm.After modified layer is added on the surface of felt-metal, the filtering accuracy of gained modification felt-metal filtering material has greatly improved compared with the filtering accuracy of felt-metal body, and felt-metal body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification felt-metal filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.
Embodiment 2
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 10wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(aperture is 20 μm, and air flux is 1600m to adopt the felt-metal of 304 steel alloy materials 3/ m 2hKPa, thickness is 0.9mm) be filtering material body, be coated on felt-metal body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of felt-metal body spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 180 DEG C from room temperature, insulation 160min; Second stage: rise to 550 DEG C from 180 DEG C, insulation 180min; Phase III: rise to 1050 DEG C from 550 DEG C, insulation 120min; Heating rate in whole sintering process is 5 DEG C/min.
Namely modification felt-metal filtering material is obtained after having sintered, intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of felt-metal body) and NiCu intermetallic compound, wherein, the Ni powder of Ni element source in intermetallic compound in felt-metal body and powder, the Cu powder of Cu element source in powder, modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 200 μm, and average pore size is 3 μm.After modified layer is added on the surface of felt-metal, the filtering accuracy of gained modification felt-metal filtering material has greatly improved compared with the filtering accuracy of felt-metal body, and felt-metal body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification felt-metal filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.
Embodiment 3
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 20wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(aperture is 25 μm, and air flux is 2000m to adopt the felt-metal of 304 steel alloy materials 3/ m 2hKPa, thickness is 1.2mm) be filtering material body, be coated on felt-metal body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of felt-metal body spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 240 DEG C from room temperature, insulation 140min; Second stage: rise to 650 DEG C from 240 DEG C, insulation 150min; Phase III: rise to 1050 DEG C from 650 DEG C, insulation 150min; Heating rate in whole sintering process is 5 DEG C/min.
Namely modification felt-metal filtering material is obtained after having sintered, intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of felt-metal body) and NiCu intermetallic compound, wherein, the Ni powder of Ni element source in intermetallic compound in felt-metal body and powder, the Cu powder of Cu element source in powder, modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 100 μm, and average pore size is 10 μm.After modified layer is added on the surface of felt-metal, the filtering accuracy of gained modification felt-metal filtering material has greatly improved compared with the filtering accuracy of felt-metal body, and felt-metal body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification felt-metal filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.
Embodiment 4
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 28wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(aperture is 30 μm, and air flux is 1100m to adopt the felt-metal of 304 steel alloy materials 3/ m 2hKPa, thickness is 2.5mm) be filtering material body, be coated on felt-metal body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of felt-metal body spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 300 DEG C from room temperature, insulation 120min; Second stage: rise to 700 DEG C from 300 DEG C, insulation 90min; Phase III: rise to 1050 DEG C from 700 DEG C, insulation 180min; Heating rate in whole sintering process is 5 DEG C/min.
Namely modification felt-metal filtering material is obtained after having sintered, intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of felt-metal body), NiCu intermetallic compound and NiCrFe intermetallic compound, wherein, the Ni powder of Ni element source in intermetallic compound in felt-metal body and powder, the Cu powder of Cu element source in powder, Cr element and Fe element source are in felt-metal body, modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 20 μm, and average pore size is 14 μm.After modified layer is added on the surface of felt-metal, the filtering accuracy of gained modification felt-metal filtering material has greatly improved compared with the filtering accuracy of felt-metal body, and felt-metal body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification felt-metal filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.
Embodiment 5
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 1wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(aperture is 15 μm to the sintered metal mesh of employing 316L steel alloy material, and air flux is 560m 3/ m 2hKPa, thickness is 0.5mm) be filtering material body, be coated on sintered metal mesh body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of sintered metal mesh spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 120 DEG C from room temperature, insulation 180min; Second stage: rise to 500 DEG C from 120 DEG C, insulation 240min; Phase III: rise to 1050 DEG C from 500 DEG C, insulation 90min; Heating rate in whole sintering process is 5 DEG C/min.
Namely obtain modification sintered metal mesh filtering material after having sintered, wherein intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of sintered metal mesh body), and modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 300 μm, and average pore size is 1 μm.After modified layer is added on the surface of sintered metal mesh, the filtering accuracy of gained modification sintered metal mesh filtering material has greatly improved compared with the filtering accuracy of sintered metal mesh body, and sintered metal mesh body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification sintered metal mesh filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.
Embodiment 6
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 10wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(aperture is 20 μm to the sintered metal mesh of employing 316L steel alloy material, and air flux is 1550m 3/ m 2hKPa, thickness is 1mm) be filtering material body, be coated on sintered metal mesh body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of sintered metal mesh body spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 180 DEG C from room temperature, insulation 160min; Second stage: rise to 550 DEG C from 180 DEG C, insulation 180min; Phase III: rise to 1050 DEG C from 550 DEG C, insulation 120min; Heating rate in whole sintering process is 5 DEG C/min.
Namely modification sintered metal mesh filtering material is obtained after having sintered, intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of sintered metal mesh body) and NiCu intermetallic compound, wherein, the Ni powder of Ni element source in intermetallic compound in sintered metal mesh body and powder, the Cu powder of Cu element source in powder, modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 200 μm, and average pore size is 3 μm.After modified layer is added on the surface of sintered metal mesh, the filtering accuracy of gained modification sintered metal mesh filtering material has greatly improved compared with the filtering accuracy of sintered metal mesh body, and sintered metal mesh body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification sintered metal mesh filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.
Embodiment 7
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 20wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(aperture is 23 μm to the sintered metal mesh of employing 316L steel alloy material, and air flux is 2000m 3/ m 2hKPa, thickness is 1.5mm) be filtering material body, be coated on sintered metal mesh body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of sintered metal mesh body spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 240 DEG C from room temperature, insulation 140min; Second stage: rise to 650 DEG C from 240 DEG C, insulation 150min; Phase III: rise to 1050 DEG C from 650 DEG C, insulation 120min; Heating rate in whole sintering process is 5 DEG C/min.
Namely modification sintered metal mesh filtering material is obtained after having sintered, intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of sintered metal mesh body) and NiCu intermetallic compound, wherein, the Ni powder of Ni element source in intermetallic compound in sintered metal mesh body and powder, the Cu powder of Cu element source in powder, modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 100 μm, and average pore size is 10 μm.After modified layer is added on the surface of sintered metal mesh, the filtering accuracy of gained modification sintered metal mesh filtering material has greatly improved compared with the filtering accuracy of sintered metal mesh body, and sintered metal mesh body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification sintered metal mesh filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.
Embodiment 8
First carbonyl Ni powder (purity is 99.5%, and average grain diameter is 3-5 μm) and Cu powder (purity is 99.7%, and average grain diameter is 5-10 μm) batch mixing 8h in batch mixer are made its abundant batch mixing even, in powder, Cu content is 28wt%.Then contain the proportion preparation slurry of 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, stir 2h until without obvious bubble and layering in slurry.(aperture is 30 μm to the sintered metal mesh of employing 316L steel alloy material, and air flux is 900m 3/ m 2hKPa, thickness is 3mm) be filtering material body, be coated on sintered metal mesh body by spraying by slurry, then dry 4h at 60 DEG C, wherein, the quantity for spray of slurry is every square metre of sintered metal mesh body spraying 300g slurry.Adopt following sintering process subsequently: the first stage: rise to 300 DEG C from room temperature, insulation 120min; Second stage: rise to 700 DEG C from 300 DEG C, insulation 240min; Phase III: rise to 1050 DEG C from 700 DEG C, insulation 180min; Heating rate in whole sintering process is 5 DEG C/min.
Namely modification sintered metal mesh filtering material is obtained after having sintered, intermediate layer comprises solid solution (Cu and Ni is solid-solution in the surface of sintered metal mesh body), NiCu intermetallic compound and NiCrFe intermetallic compound, wherein, the Ni powder of Ni element source in intermetallic compound in sintered metal mesh body and powder, the Cu powder of Cu element source in powder, Cr element and Fe element source are in sintered metal mesh body, modified layer is Ni-Cu alloy, comprises intermetallic compound.The thickness of modified layer is 20 μm, and average pore size is 14 μm.After modified layer is added on the surface of sintered metal mesh, the filtering accuracy of gained modification sintered metal mesh filtering material has greatly improved compared with the filtering accuracy of sintered metal mesh body, and sintered metal mesh body is combined with modified layer by intermediate layer, adhesion is strong, comprehensive mechanical property is excellent, long service life, therefore, this modification sintered metal mesh filtering material has excellent resistance to elevated temperatures, high filtering precision and low cost of manufacture concurrently.

Claims (10)

1. modification filtering material, described modification filtering material comprises filtering material body, it is characterized in that: described modification filtering material also comprises and the modified layer that is connected of filtering material body chemistry, and the filtering accuracy of modified layer is higher than the filtering accuracy of filtering material body; The thickness of described modified layer is 20-300 μm, and average pore size is 1-14 μm.
2. modification filtering material as claimed in claim 1, it is characterized in that: described modified layer is connected with filtering material body by intermediate layer, described intermediate layer is obtained by the powder and filtering material bulk reaction being sprayed at filtering material body surface; Be not converted into modified layer with the powder of filtering material bulk reaction.
3. modification filtering material as claimed in claim 2, is characterized in that: described powder comprises the first powder and the second powder; Described intermediate layer is solid solution and/or intermetallic compound; Described modified layer is metal alloy porous material.
4. modification filtering material as claimed in claim 3, is characterized in that: described first powder/the second powder is Ni powder/Cu powder, Fe powder/Al powder, Ti powder/Al powder, Cu powder/Zn powder, Fe powder/Cr powder, Mg powder/Cd powder, Ag powder/Au powder or Ti powder/Zr powder; When the first powder/the second powder is Ni powder/Cu powder, modified layer is Ni-Cu alloy, and the solid solution in intermediate layer is the surface that Cu and Ni is solid-solution in filtering material body, and intermetallic compound is NiCu and/or NiCrFe.
5. modification filtering material as claimed in claim 4, is characterized in that: described second powder accounts for the 1%-28% of powder gross mass.
6. modification filtering material as claimed in claim 5, is characterized in that: described second powder accounts for the 10%-20% of powder gross mass.
7. modification filtering material as claimed in claim 2 or claim 3, it is characterized in that: the pre-configured form slurry of described powder, then spray to filtering material body surface, described slurry contains the proportioning preparation of 1-5g thermoplastic resin, 50-90g powder according to every 100mL alcohol solution.
8. modification filtering material as claimed in claim 1, is characterized in that: the thickness of described modified layer is 100-200 μm, and average pore size is 3-10 μm.
9. modification filtering material as claimed in claim 1, is characterized in that: described filtering material body is average pore size is 15-30 μm, material is steel alloy sintered metal mesh or felt-metal.
10. the preparation method of modification filtering material, comprise the following steps: the proportioning preparation slurries 1) containing 1-5gPVB, 50-90g powder according to every 100mL ethanolic solution, the equal particle diameter of Ni powder peace that described powder is 3-5 μm by average grain diameter is that the Cu powder of 5-10 μm forms, and wherein the percentage by weight of Cu is 1%-28%; 2) at least one side of filtering material body spraying slurries and at 50-120 DEG C dry 2-6h, described filtering material body is sintered metal mesh or felt-metal, and average pore size is 15-30 μm, material is steel alloy; 3) segmented sintering process: the sintering temperature of first stage is 120-300 DEG C, insulation 120-180min, programming rate is 1-20 DEG C/min, the sintering temperature of second stage is 500-700 DEG C, insulation 90-240min, programming rate is 1-5 DEG C/min, and the sintering temperature of phase III is 900-1100 DEG C, insulation 90-180min, programming rate is 1-10 DEG C/min; 4), after having sintered, cool and obtain described modification filtering material.
CN201510847946.6A 2015-11-26 2015-11-26 Modified filter material and preparation method thereof Pending CN105435535A (en)

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Application publication date: 20160330