CN102029391A - Stainless steel based metal fiber porous material with high specific surface area and preparation method thereof - Google Patents
Stainless steel based metal fiber porous material with high specific surface area and preparation method thereof Download PDFInfo
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- CN102029391A CN102029391A CN2010105226449A CN201010522644A CN102029391A CN 102029391 A CN102029391 A CN 102029391A CN 2010105226449 A CN2010105226449 A CN 2010105226449A CN 201010522644 A CN201010522644 A CN 201010522644A CN 102029391 A CN102029391 A CN 102029391A
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Abstract
The invention discloses a stainless steel based metal fiber porous material with high specific surface area and a preparation method thereof. The preparation method comprises the following steps of: firstly machining continuous stainless steel fiber on a stainless steel bar material by a large-blade inclination-angle multi-tooth cutting tool; after pretreatments including washing, deoiling and acid washing are carried out on a stainless steel fiber, plating the surface of the stainless steel bar material with a chemical copper plating method to obtain a copper plating layer with a structure of abundant surface copper micro-particles; and after the stainless steel fiber with plated copper is molded and preformed, placing the stainless steel fiber in a reducing atmosphere protective furnace to carry out the low-temperature solid-phase sintering for 30-90mins at 850-950 DEG C, and then cooling along the furnace to prepare the stainless steel based metal fiber porous material with the high specific surface area. The BET(Brunauer Emmett Teller) specific surface area of the stainless steel based metal fiber porous material can be up to more than 0.2m<2>/g, and the shearing force thereof is more than twice of that of a sintering copper fiber porous material under the same test conditions.
Description
Technical field
The present invention relates to a kind of metal fiber polyporous material, particularly relate to the preparation method of the stainless steel-based metal fiber polyporous material of high-specific surface area.
Background technology
Porous metal material has the three-dimensional pore space structure because of inside and has kept the characteristic of metal material, thereby becomes the characteristics new engineering material of structure set material and functional material.Important branch as porous metal material, characteristics such as metal fiber polyporous material (SMFM) has the mechanical strength height, specific area is big, porosity is high and production cost is low, these advantages make its sound absorption, filter and separate, fields such as catalytic carrier, biomedical material, fuel cell, porous metals electrode are used widely.Along with the continuous expansion of SMFM application, its requirement no longer is confined on machinery, the physical property.Discover that the size of SMFM specific area directly influences the performance of material at aspects such as filtration, sound absorption, capillary function and catalyst adhere to.Yet in the SMFM manufacture process, behind the metallic fiber process traditional handicraft thermal sintering, the original micro-structural of fiber surface can obviously reduce even disappear, and causes SMFM specific area and correlation loss of energy.Experiment shows that reducing sintering temperature is to reduce the effective way that sintering process is destroyed for the fiber surface pattern.
On the basis of the achievement in research that people such as German RM obtain for interpolation sintering aid activated sintering technology, be widely used in field of metallurgy at present by the intensified-sintered technology of adding active material reduction sintering temperature.MARKAKI A E, GERGELY V, COCKBURN A, CLYNE T W.Production of a highly porous material by liquid phase sintering of short ferritic stainless steel fibres and a preliminary study of its mechanical behaviour[J] .Composites Science and Technology, 2003,63 (16): 2345-2351 discloses the sintering that low-temperature sintering technology is applied to stainless steel fibre, adopt electroplating technology on the stainless steel fibre surface plated copper layer equably, realize the metallurgical binding of stainless steel fibre by liquid-phase sintering in short-term.Realized that the low-temperature sintering shaping of stainless steel material also can obtain the SMFM material of mechanical strength properties excellence, yet its liquid sintering technology that adopts meeting heavy damage fiber surface micro-structural is not suitable for the preparation of height ratio table SMFM.
Summary of the invention
The object of the present invention is to provide a kind of BET specific area test value to reach 0.2190m
2/ g, the preparation method of the stainless steel-based metal fiber polyporous material of good mechanical performance.
Another purpose of the present invention is to provide the stainless steel-based metal fiber polyporous material of method for preparing.
The present invention obtains having the high surface energy that enriches the microparticle surface texture, the copper coating of height ratio table by the stainless steel fibre rough surface chemistry plating in machining, and adopt the low temperature solid-phase sintering to reduce the destruction of sintering process, thereby realize the preparation of the stainless steel-based metal fiber polyporous material of height ratio table for the fiber surface micro-structural.
The present invention's first purpose is achieved through the following technical solutions:
The preparation method of the stainless steel-based metal fiber polyporous material of a kind of height ratio table comprises the steps and process conditions:
(1) adopt big cutting edge inclination multitooth tool on lathe, to cut out continuous stainless steel fibre;
(2) stainless steel fibre being placed temperature is that 60 ~ 70 ℃, mass concentration are that 20 ~ 30% sodium hydroxide solutions soaked 10 ~ 20 minutes; It is that 60 ~ 70 ℃, mass concentration are that 10 ~ 15% sulfuric acid solutions soaked 10 ~ 20 minutes that stainless steel fibre after will soaking then places temperature; Adopt the electroless copper method at the attached copper layer of stainless steel fibre surface plating again, with the densimeter in plating bath, plating bath consists of: Salzburg vitriol 8-12g/L, ethylenediamine tetra-acetic acid 8-12g/L, sodium potassium tartrate tetrahydrate 30-40g/L, NaOH reagent 8-14g/L, formaldehyde 8-10g/L and catalytic activity agent nickelous sulfate 2-3g/L; Bath temperature is controlled to be 40 ~ 60 ℃, is incubated to plating bath to clarify;
(3) stainless steel fibre after the copper facing is pressed in the mould, places gas-protecting sintering stove low temperature sintering, under 850 ℃ ~ 950 ℃ temperature, sintering 30-90 minute;
For further realizing the object of the invention, the described big cutting edge inclination multitooth tool material of described step (1) is a high-speed steel, utilizes line cutting processing mode to process the main cutting edge that a plurality of S type pocket knife teeth are formed, tooth pitch m=0.3mm, tooth depth h=0.2mm.
Mould in the described step (3) comprises stainless steel die cavity, corundum baffle and stainless steel platen, all is provided with corundum baffle and stainless steel platen in stainless steel die cavity both sides.
Another purpose of the present invention is achieved through the following technical solutions:
The stainless steel-based metal fiber polyporous material of a kind of high-specific surface area, by method for preparing, the BET specific area test value 〉=0.2m of this material
2/ g; Shearing force testing value 〉=2500N.
With respect to prior art, the present invention has following characteristics:
1) adopts the stainless steel fibre copper coating of chemical plating process in machining; The copper coating that obtains has the cell space of enriching shape copper microparticle surface topography, has greatly improved fiber specific surface area and made fiber be in the high surface energy state to be beneficial to sintering;
2) the low temperature solid-phase sintering of having finished copper facing stainless steel fibre sample under 850 ℃ sintering temperature is shaped, and effectively reduces the destruction of sintering process to the fibrous material surface micro-structure;
3) adopt the stainless steel-based metal fiber polyporous material of this technology preparation to have higher specific surface area: BET specific area test value reaches 0.2190m
2/ g, and present commercialization stainless steel fibre porous material＜0.01m
2/ g;
4) adopting the stainless steel-based metal fiber polyporous material of this technology preparation to have the good mechanical performance, is more than 2 times of sintered copper fiber multihole material in its shearing force under the same test condition.
Description of drawings
Fig. 1 is the multitooth tool structural representation;
Fig. 2 is the SEM photo of the stainless steel fibre that processes;
Fig. 3 is the SEM photo of stainless steel fibre after the copper facing;
Fig. 4 makes stainless steel fibre felt SEM photo for behind the sintering.
Specific embodiments
Below the specific embodiment of the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
First step processing stainless steel fiber.The long stainless steel rod iron of Φ 60 * 400mm is clamped on the CM6140 lathe, at first adopts normal cylindrical lathe tool excision stainless steel bar rough surface part.Next uses big cutting edge inclination multitooth tool turning stainless steel fibre, cutter structure is (is introduction among 200610124078.x Fig. 4 and the embodiment referring to the patent No.) as shown in Figure 1, cutter material is a high-speed steel, utilize line cutting processing mode to process the main cutting edge that a plurality of S type pocket knife teeth are formed, tooth pitch m=0.3mm, tooth depth h=0.2mm.It is as follows to utilize this big cutting edge inclination multitooth tool to make the stainless steel fibre process: cutter is installed on the knife rest, and the cutter setting angle is 45 °, adjusts the cutter height.Cutting parameter is as follows: amount of feeding f=0.1mm/r, back engagement of the cutting edge a
p=0.1mm, cutting speed v=13.19m/min, machining condition is for doing cutting.Cut out continuous stainless steel fibre, its equivalent diameter is 50 μ m.
Second step was carried out preliminary treatment to fiber.The stainless steel fibre that processing is obtained is cut into the long short fiber of 20mm on cutting machine, collecting and being placed on mass concentration is in 20% the sodium hydroxide solution, and water-bath is heated to 60 ℃ and be incubated 20 minutes, to remove the grease of fiber surface.Wash with fiber collecting and with running water after oil removing finishes, the alkali lye that flush away is residual places mass concentration 10% sulfuric acid solution again, water-bath is heated to 60 ℃ and be incubated 20 minutes, make the fiber surface passivation, wash the acid solution that flush away is residual with fiber collecting and with running water after passivation finishes;
The 3rd step was used chemical method copper facing on fiber.At first dispose plating bath, according to the densimeter of batching in plating bath, electroplate liquid formulation is as follows: Salzburg vitriol (8g/L), ethylenediamine tetra-acetic acid (8g/L), sodium potassium tartrate tetrahydrate (30g/L), NaOH reagent (8g/L), formaldehyde (8g/L) and catalytic activity agent nickelous sulfate (2g/L).With 500ml plating bath plating 30g stainless steel fibre is example, the copper facing operation is as follows: get Salzburg vitriol 5g, ethylenediamine tetra-acetic acid 5g, sodium potassium tartrate tetrahydrate 20g, NaOH 6g and nickelous sulfate 1g respectively and put into container, the back adds pure water preparation 500ml solution, the solution water-bath is heated to 50 ℃, be stirred to all components and all dissolve, this moment, solution was navy blue.Add pretreated fiber again, splash into formaldehyde 5g simultaneously, be incubated to the plating bath complete reaction, the plating bath clarification, the copper layer of one deck redness is enclosed in plating on the visible stainless steel fibre.Stainless steel fibre after copper facing surface copper coating SEM figure as shown in Figure 3, the copper coating that the stainless steel fibre surface forms after the plating has been realized stainless steel base is coated preferably, and the distributing cell space shape copper particle of a large amount of minute yardsticks of coating surface;
The pressing sintering of the 4th step fiber.With the oven dry of the stainless steel fibre after the copper facing, be pressed in the die cavity of sintering mold, tighten with screw.Mould comprises stainless steel die cavity, corundum baffle and stainless steel platen, all is provided with corundum baffle and stainless steel platen in stainless steel die cavity both sides.The mould outermost layer is two stainless steel platens, and penetralia is the stainless steel die cavity, separates with the corundum baffle between pressing plate and the die cavity.Mold integral is placed the gas-protecting sintering stove, passes to hydrogen, be heated under 850 ℃ of temperature, sintering 60 minutes, after cool to room temperature with the furnace.Can take a sample after stove is cold; open mould; the porous fibre felt that can obtain sintering; its structure such as Fig. 3 show; this be since in sintering process the less copper microparticle of coating surface yardstick can take the lead in being evaporated or melting, these are discrete and a small amount of liquid phase copper that exists can be realized gathering and spheroidizing under capillary effect.
After testing, adopt the stainless steel-based metal fiber polyporous material of this method preparation to have the copper microparticle surface topography coating structure that enriches cell space shown in Figure 4, not only the specific area height can reach 0.2190m
2/ g, and realized the excellent metallurgical binding at the fiber contact area, porosity reaches 90%.
Embodiment 2
First step processing stainless steel fiber.The long stainless steel rod iron of Φ 60 * 400mm is clamped on the CM6140 lathe, at first adopts normal cylindrical lathe tool excision stainless steel bar rough surface part.Next uses big cutting edge inclination multitooth tool turning stainless steel fibre, cutter structure as shown in Figure 1, cutter material is a high-speed steel, utilizes line cutting processing mode to process the main cutting edge that a plurality of pocket knife teeth are formed, tooth pitch m=0.3mm, tooth depth h=0.2mm.Multitooth tool is as shown in Figure 2 made the stainless steel fibre process, and detailed process is as follows: cutter is installed on the knife rest, and the cutter setting angle is 45 °, adjusts the cutter height.Cutting parameter is as follows: amount of feeding f=0.1mm/r, back engagement of the cutting edge a
p=0.2mm, cutting speed v=13.19m/min, machining condition is for doing cutting.Cut out continuous stainless steel fibre, its equivalent diameter is 50 μ m.
Second step was carried out preliminary treatment to fiber.The stainless steel fibre that processing is obtained is cut into the long short fiber of 25mm on cutting machine, collecting and being placed on mass concentration is in 30% the sodium hydroxide solution, and water-bath is heated to 70 ℃ and be incubated 10 minutes, to remove the grease of fiber surface.Wash with fiber collecting and with running water after oil removing finishes, the alkali lye that flush away is residual places mass concentration 15% sulfuric acid solution again, water-bath is heated to 70 ℃ and be incubated 10 minutes, make the fiber surface passivation, wash the acid solution that flush away is residual with fiber collecting and with running water after passivation finishes;
The 3rd step was used chemical method copper facing on fiber.At first dispose plating bath, according to the densimeter of batching in plating bath, electroplate liquid formulation is as follows: Salzburg vitriol (12g/L), ethylenediamine tetra-acetic acid (12g/L), sodium potassium tartrate tetrahydrate (40g/L), NaOH reagent (14g/L), formaldehyde (10g/L) and catalytic activity agent nickelous sulfate (3g/L).With 500ml plating bath plating 30g stainless steel fibre is example, the copper facing operation is as follows: get Salzburg vitriol 5g, ethylenediamine tetra-acetic acid 5g, sodium potassium tartrate tetrahydrate 20g, NaOH 6g and nickelous sulfate 1g respectively and put into container, the back adds pure water preparation 500ml solution, the solution water-bath is heated to 50 ℃, be stirred to all components and all dissolve, this moment, solution was navy blue.Add pretreated fiber again, splash into formaldehyde 5g simultaneously, be incubated to the plating bath complete reaction, the plating bath clarification, the copper layer of one deck redness is enclosed in plating on the visible stainless steel fibre.Stainless steel fibre after copper facing surface copper coating SEM figure as shown in Figure 4, the copper coating that the stainless steel fibre surface forms after the plating has been realized stainless steel base is coated preferably, and the distributing cell space shape copper particle of a large amount of minute yardsticks of coating surface;
The pressing sintering of the 4th step fiber.With the stainless steel fibre after copper facing oven dry, take by weighing in a certain amount of die cavity that is pressed on sintering mold, tighten with screw.Sintering mold structure such as Fig. 5 show that the sintering mold outermost layer is two stainless steel platens, and penetralia is the stainless steel die cavity, separates with the corundum baffle between pressing plate and the die cavity.Mold integral is placed the gas-protecting sintering stove, passes to hydrogen, be heated under 950 ℃ of temperature, sintering 90 minutes, after cool to room temperature with the furnace.Can take a sample after stove is cold, open mould, the porous fibre felt that can obtain sintering, its structure such as Fig. 6 show, this be since in sintering process the less copper microparticle of coating surface yardstick can take the lead in being evaporated or melting, these are discrete and a small amount of liquid phase copper that exists can be realized gathering and spheroidizing under capillary effect;
Adopt the stainless steel-based metal fiber polyporous material of this method preparation to have the copper microparticle surface topography coating structure that enriches cell space shown in Figure 6, not only the specific area height can reach 0.2190m
2/ g, and realized the excellent metallurgical binding at the fiber contact area, porosity reaches 80%.
Embodiment 3
First step processing stainless steel fiber.The long stainless steel rod iron of Φ 60 * 400mm is clamped on the CM6140 lathe, at first adopts normal cylindrical lathe tool excision stainless steel bar rough surface part.Next uses big cutting edge inclination multitooth tool turning stainless steel fibre, cutter structure as shown in Figure 1, cutter material is a high-speed steel, utilizes line cutting processing mode to process the main cutting edge that a plurality of pocket knife teeth are formed, tooth pitch m=0.3mm, tooth depth h=0.2mm.Multitooth tool is as shown in Figure 2 made the stainless steel fibre process, and detailed process is as follows: cutter is installed on the knife rest, and the cutter setting angle is 45 °, adjusts the cutter height.Cutting parameter is as follows: amount of feeding f=0.15mm/r, back engagement of the cutting edge a
p=0.1mm, cutting speed v=13.19m/min, machining condition is for doing cutting.Cut out continuous stainless steel fibre, its equivalent diameter is 50 μ m.
Second step was carried out preliminary treatment to fiber.The stainless steel fibre that processing is obtained is cut into the long short fiber of 22.5mm on cutting machine, collecting and being placed on mass concentration is in 25% the sodium hydroxide solution, and water-bath is heated to 65 ℃ and be incubated 15 minutes, to remove the grease of fiber surface.Wash with fiber collecting and with running water after oil removing finishes, the alkali lye that flush away is residual places mass concentration 12.5% sulfuric acid solution again, water-bath is heated to 65 ℃ and be incubated 15 minutes, make the fiber surface passivation, wash the acid solution that flush away is residual with fiber collecting and with running water after passivation finishes;
The 3rd step was used chemical method copper facing on fiber.At first dispose plating bath, according to the densimeter of batching in plating bath, electroplate liquid formulation is as follows: Salzburg vitriol (10g/L), ethylenediamine tetra-acetic acid (10g/L), sodium potassium tartrate tetrahydrate (35g/L), NaOH reagent (111g/L), formaldehyde (9g/L) and catalytic activity agent nickelous sulfate (2.5g/L).With 500ml plating bath plating 30g stainless steel fibre is example, the copper facing operation is as follows: get Salzburg vitriol 5g, ethylenediamine tetra-acetic acid 5g, sodium potassium tartrate tetrahydrate 20g, NaOH 6g and nickelous sulfate 1g respectively and put into container, the back adds pure water preparation 500ml solution, the solution water-bath is heated to 50 ℃, be stirred to all components and all dissolve, this moment, solution was navy blue.Add pretreated fiber again, splash into formaldehyde 5g simultaneously, be incubated to the plating bath complete reaction, the plating bath clarification, the copper layer of one deck redness is enclosed in plating on the visible stainless steel fibre.Stainless steel fibre after copper facing surface copper coating SEM figure as shown in Figure 4, the copper coating that the stainless steel fibre surface forms after the plating has been realized stainless steel base is coated preferably, and the distributing cell space shape copper particle of a large amount of minute yardsticks of coating surface;
The pressing sintering of the 4th step fiber.With the stainless steel fibre after copper facing oven dry, take by weighing in a certain amount of die cavity that is pressed on sintering mold, tighten with screw.Sintering mold structure such as Fig. 5 show that the sintering mold outermost layer is two stainless steel platens, and penetralia is the stainless steel die cavity, separates with the corundum baffle between pressing plate and the die cavity.Mold integral is placed the gas-protecting sintering stove, passes to hydrogen, be heated under 900 ℃ of temperature, sintering 75 minutes, after cool to room temperature with the furnace.Can take a sample after stove is cold, open mould, the porous fibre felt that can obtain sintering, its structure such as Fig. 6 show, this be since in sintering process the less copper microparticle of coating surface yardstick can take the lead in being evaporated or melting, these are discrete and a small amount of liquid phase copper that exists can be realized gathering and spheroidizing under capillary effect;
Adopt the stainless steel-based metal fiber polyporous material of this method preparation to have the copper microparticle surface topography coating structure that enriches cell space shown in Figure 6, not only the specific area height can reach 0.2190m
2/ g, and realized the excellent metallurgical binding at the fiber contact area, porosity reaches 70%.
The above, it only is the preferable embodiment of patent of the present invention, be not that the present invention is done any type of restriction, anyly be familiar with these professional method personnel and may utilize the technology contents of above-mentioned announcement to be changed or be modified to the equivalent embodiment of equivalent variations, but everyly do not break away from technical scheme content of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification all still belong to the scope of technical solution of the present invention.
Claims (4)
1. the preparation method of the stainless steel-based metal fiber polyporous material of height ratio table is characterized in that comprising the steps and process conditions:
(1) adopt big cutting edge inclination multitooth tool on lathe, to cut out continuous stainless steel fibre;
(2) stainless steel fibre being placed temperature is that 60 ~ 70 ℃, mass concentration are that 20 ~ 30% sodium hydroxide solutions soaked 10 ~ 20 minutes; It is that 60 ~ 70 ℃, mass concentration are that 10 ~ 15% sulfuric acid solutions soaked 10 ~ 20 minutes that stainless steel fibre after will soaking then places temperature; Adopt the electroless copper method at the attached copper layer of stainless steel fibre surface plating again, with the densimeter in plating bath, plating bath consists of: Salzburg vitriol 8-12g/L, ethylenediamine tetra-acetic acid 8-12g/L, sodium potassium tartrate tetrahydrate 30-40g/L, NaOH reagent 8-14g/L, formaldehyde 8-10g/L and catalytic activity agent nickelous sulfate 2-3g/L; Bath temperature is controlled to be 40 ~ 60 ℃, is incubated to plating bath to clarify;
(3) stainless steel fibre after the copper facing is pressed in the mould, places gas-protecting sintering stove low temperature sintering, under 850 ℃ ~ 950 ℃ temperature, sintering 30-90 minute;
2. the preparation method of the stainless steel-based metal fiber polyporous material of height ratio table according to claim 1, it is characterized in that the described big cutting edge inclination multitooth tool material of described step (1) is a high-speed steel, utilize line cutting processing mode to process the main cutting edge that a plurality of S type pocket knife teeth are formed, tooth pitch m=0.3mm, tooth depth h=0.2mm.
3. the preparation method of the stainless steel-based metal fiber polyporous material of height ratio table according to claim 1; it is characterized in that the mould in the described step (3) comprises stainless steel die cavity, corundum baffle and stainless steel platen, all is provided with corundum baffle and stainless steel platen in stainless steel die cavity both sides.
4. the stainless steel-based metal fiber polyporous material of high-specific surface area prepares the BET specific area test value 〉=0.2m of this material by each described method of claim 1-3
2/ g; Shearing force testing value 〉=2500N.
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| CN102290582A (en) * | 2011-06-20 | 2011-12-21 | 华南理工大学 | Stainless steel fiber felt used for fuel battery bipolar plate and manufacturing method thereof |
| CN104475740A (en) * | 2014-11-12 | 2015-04-01 | 华南理工大学 | Copper fiber felt material with nanometer porous surface structure and preparation method thereof |
| CN105013542A (en) * | 2015-06-15 | 2015-11-04 | 华南理工大学 | Honeycomb carrier based on stainless steel fiber sintering, and preparation method thereof |
| CN105880596A (en) * | 2016-06-06 | 2016-08-24 | 华南理工大学 | Application of bending torsion filaments obtained by chopping steel wire rope |
| CN106237712A (en) * | 2016-08-31 | 2016-12-21 | 朱正秋 | A kind of nano metal fiber filter material |
| CN106319581A (en) * | 2016-10-21 | 2017-01-11 | 昆明理工大学 | Method for green copper plating of stainless steel filaments under catalysis of metals |
| CN111530507A (en) * | 2020-04-08 | 2020-08-14 | 上海大学 | Monolithic catalyst for low-temperature selective catalytic oxidation of ammonia, preparation method and application thereof |
| CN114411141A (en) * | 2022-01-19 | 2022-04-29 | 西部宝德科技股份有限公司 | Nest-shaped stainless steel porous material and preparation method thereof |
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| CN102290582A (en) * | 2011-06-20 | 2011-12-21 | 华南理工大学 | Stainless steel fiber felt used for fuel battery bipolar plate and manufacturing method thereof |
| CN104475740A (en) * | 2014-11-12 | 2015-04-01 | 华南理工大学 | Copper fiber felt material with nanometer porous surface structure and preparation method thereof |
| CN104475740B (en) * | 2014-11-12 | 2016-04-13 | 华南理工大学 | A kind of copper fibrous felt materials with nano-porous surface structure and preparation method thereof |
| CN105013542A (en) * | 2015-06-15 | 2015-11-04 | 华南理工大学 | Honeycomb carrier based on stainless steel fiber sintering, and preparation method thereof |
| CN105880596A (en) * | 2016-06-06 | 2016-08-24 | 华南理工大学 | Application of bending torsion filaments obtained by chopping steel wire rope |
| CN105880596B (en) * | 2016-06-06 | 2017-10-20 | 华南理工大学 | Steel wire rope is chopped into the filametntary application of bending |
| CN106237712A (en) * | 2016-08-31 | 2016-12-21 | 朱正秋 | A kind of nano metal fiber filter material |
| CN106319581A (en) * | 2016-10-21 | 2017-01-11 | 昆明理工大学 | Method for green copper plating of stainless steel filaments under catalysis of metals |
| CN111530507A (en) * | 2020-04-08 | 2020-08-14 | 上海大学 | Monolithic catalyst for low-temperature selective catalytic oxidation of ammonia, preparation method and application thereof |
| CN114411141A (en) * | 2022-01-19 | 2022-04-29 | 西部宝德科技股份有限公司 | Nest-shaped stainless steel porous material and preparation method thereof |
| CN114411141B (en) * | 2022-01-19 | 2023-07-07 | 西部宝德科技股份有限公司 | Nest-shaped stainless steel porous material and preparation method thereof |
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