CN102554228A - Method for forming ultrathin-wall porous metal pipe fitting - Google Patents
Method for forming ultrathin-wall porous metal pipe fitting Download PDFInfo
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- CN102554228A CN102554228A CN2012100095483A CN201210009548A CN102554228A CN 102554228 A CN102554228 A CN 102554228A CN 2012100095483 A CN2012100095483 A CN 2012100095483A CN 201210009548 A CN201210009548 A CN 201210009548A CN 102554228 A CN102554228 A CN 102554228A
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Abstract
A method for forming an ultrathin-wall porous metal pipe fitting belongs to the field of powder metallurgy production and includes the steps: firstly, adding monomers and crosslinking agents into organic solvents or deionized water according to the volume ratio of 1-120:1 to prepare pre-mixed liquor with the concentration of 5-50wt%; secondly, mixing metal powder and pore-forming agents with the prepared pre-mixed liquor of a stable gel system, adding dispersing agents accounting for 0.05-5wt% of the mass of metal powder, adjusting pH (potential of hydrogen) and stirring or ball-milling the mixture for 2-10h to prepare suspending slurry with fine flowability; thirdly, adding 0.1-3.5wt% of catalysts and initiating agents, evenly stirring the mixture, filling the mixture into a large-size mould in a complicated shape after vacuum degassing, demoulding after solidifying the mixture for 30s-30min at the temperature of 30-90 DEG C, and drying a blank in vacuum or protective atmosphere; and finally sintering the blank into a pair. The method can be used for preparing the ultrathin-wall porous metal pipe fitting, so that the problem of easiness of breakage in pressure forming is avoided. By adjusting the content and the granularity of the pore-forming agents, the porosity and the pore size of the part are controlled, and the method is simple in process and low in production cost.
Description
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Technical field
The present invention relates to a kind of ultra-thin-wall porous metals pipe fitting forming method, belong to metallic element preparation field in the powder metallurgical production technique, a kind of gel injection-moulding shape technology of near-net-shape ultra-thin-wall porous metals pipe fitting particularly is provided.
Technical background
The porous metals pipe fitting is mainly used in the filtration that gathers vinegar, oil product, pharmacy, food and drink and chemical products, also is used for the filtration of water and air etc.It has excellent corrosion resistance, non-oxidizability, wearability, mechanical property characteristics such as (ductility and impact strengths); And have that manufacturing process is simple, long service life, characteristics such as renewable; Also have properties such as permeability, noise reduction in addition, therefore be used widely at functional areas such as the filtration of petrochemical industry, the energy, environmental protection, food, medicine and other fields, separation, fluid distributions.
At present, the method for preparing metal porous pipe is a lot, and wherein the most frequently used have hydrostatic pressing, die forming and a plasticising extruding.
Hydrostatic pressing is applicable to the preparation large pipe; Its shortcoming is that productivity ratio is low, and the pressed compact size is restive, in order to obtain final pressed compact size; Often need process again pressed compact; And generally the pressed compact wall thickness produced of this method all can not be too thin, in the process of the demoulding, is prone to brokenly, and pipe range receives the restriction of die length.
Die forming is only applicable to L/D ratio and is not more than 3 tubing, and all causes the inhomogeneities of green density usually, generally only is used in the midget tube shaping.Prepared super-elongated metallic porous thin-walled tube in the past and all can not reach one-shot forming, and often all need weld just and can reach required size.
Plasticising extruding (be like the patent No. 200910219595.9 patent) is a kind of effective ways of producing long and thin porous tubing.The vertical density of porous material that is shaped in this way is even.Because extrusion modling pressure is low, contain a large amount of volatilizable plasticizer in the material again, so be particularly suitable for producing a large amount of interconnected pores, porous material that permeability is good.But in extrusion process, particle generation plastic deformation, the product pore size can not be effectively controlled, and is difficult to satisfy the product that porosity and pore size is had specific (special) requirements.
Summary of the invention
The object of the present invention is to provide a kind of forming technique of ultra-thin-wall porous metals pipe fitting, realize the preparation of ultra-thin-wall porous pipe fitting.The porous material that is shaped in this way is without crimp, and gained even pore distribution, and pore size can control, this method are suitable for preparing the ultra-thin metal pipe fitting that hole and porosity is had specific (special) requirements.
This technology at first is that metal dust and pore creating material are mixed with the stabilizing gel system premixed liquid for preparing in advance, processes the suspended nitride of good fluidity, injects tubular die and is solidified into base substrate, sinters part at last into, and concrete technical matters is following:
1, the making of mould: process the pipe fitting of required size, after the inwall outer wall is evenly smeared the very thin vaseline of one deck, vertically be placed on smooth place, the iron sheet that makes a circle all around prevents silica gel seepage in the casting process.The mixed of silica gel and curing agent being pressed 100:0.5 ~ 1.5 is even.The silica gel that will have good fluidity slowly pours into around the pipe fitting, and silica gel is fully contacted with pipe fitting.After fully solidifying through 10 ~ 48h, take out pipe fitting, mould is for use.
2, suspended nitride preparation: with organic monomer (hydroxyethyl methacrylate (HEMA) or EMA (EMA) or trimethyl propane three acrylates (TMPTA)) and organic solvent (toluene or gasoline or long-chain alcohol) by volume 1 ~ 120:1 be configured to the premixed liquid that concentration is 10 ~ 50 wt%.In premixed liquid, add the dispersant (Solsperse-6000 hyper-dispersant or oleic acid or polyacrylate) that is pre-mixed even metal dust and pore creating material and quality 0.05 ~ 5wt% thereof; And adjusting pH value to 9.0 ~ 11.0; After stirring; (benzoyl peroxide (BPO) and initator (dimethylaniline) pour into mould after it is stirred to add the catalyst of 0.1 ~ 3.5 wt% successively.
3, solidified forming: above-mentioned slurry is slowly poured in the mould, and curing molding under the normal temperature generally will be controlled between 30 s ~ 30 min hardening time.Base substrate after solidifying is placed (30 ~ 90 ℃) drying in vacuum drying chamber or the protective atmosphere.
4, sintering: 1000 ~ 1400 ℃ of sintering obtained final ultra-thin-wall (thickness can reach 1.5mm) porous metals pipe fitting in 0.5 ~ 2 hour under vacuum or protective atmosphere.
In the present invention, employing is the gel casting technology.At first, slurry has good flowability uniformly, has solved the problem of preparation thin-wall pipe shaping difficulty, can prepare the pipe fitting of ultra-thin-wall, and blank has higher precision; Secondly, can regulate the porosity and the pore size of product through the content and the granularity of control pore creating material; At last,, do not need special degreasing process, reduced the flow process of producing because content of organics is low in the molding blank.Molding blank has certain intensity, guaranteed that the transportation of blank is shifted after the moulding, and die cost is very low, makes production cost reduce.
With the pressure forming compared with techniques, its advantage is:
1, because metal suspension gel slurry fluidity is good, can fill the mould of ultra-thin-wall pipe fitting easily, need the limited and energy consumption issues of the excessive complex character that causes of pressure when having avoided, improve molding condition greatly owing to shaping;
2, can be through regulating the content and the granularity of pore creating material, the porosity and the pore size of control product.
3, this technology only need add the organic matter of less than 5 wt%, does not need special degreasing process, and technology is simple, and production cost is significantly reduced.
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The specific embodiment
Embodiment 1: thin-walled porous stainless steel pipe fitting goods (diameter 65.5mm, wall thickness 2.0mm, height 150mm, porosity is 62.4%, pore size is 50 ~ 100um) gel casting
1, takes by weighing 325 purpose stainless steel powders and the 30g powdered glucose (use 160 orders, 300 mesh sieve mesh screens are got the particle that granularity is 50 ~ 100um) of 300g, add in the organic solution of 31 ml hydroxyethyl methacrylates (HEMA) and 31 ml toluene, mix and stir;
2, take by weighing 3g Solsperse-6000 hyper-dispersant and add in the 1st step slurry, mix, make suspended nitride;
3, measure 0.4g benzoyl peroxide (catalyst) and 1.5 ml dimethylanilines (initator) respectively and add in the suspended nitride, slowly pour pre-prepd mould after stirring into, curing molding at normal temperatures after the injection obtains the pipe fitting base substrate;
4, the pipe fitting base substrate is placed on the drying box inner drying 48h of 70 ℃ of constant temperature;
5, with dried stainless steel pipe base substrate in vacuum 3.5 * 10
-2Intensification sintering under the Pa.Temperature control: below 500 ℃ the time, programming rate is 1 ℃/min, and wherein at 300 ℃ of insulation 2 h, 500 ~ 1050 ℃ of following programming rates are 4 ℃/min, and in 1050 ℃ of insulation 2 h sintering, finally obtain ultra-thin-wall porous stainless steel pipe fitting goods.Wherein dimensional accuracy 0.5%, weight dispersion degree ± 1%, porosity is 62.4%, pore size is 50 ~ 100um.
Embodiment 2: titanium tube of thin wall spare goods (external diameter 90mm, wall thickness 3mm, height 170mm, porosity is 68%, pore size is 50 ~ 100um) gel casting
1, takes by weighing 325 purpose titanium valves and the 20g powdered glucose (use 160 orders, 300 mesh sieve mesh screens are got the particle that granularity is 50 ~ 100um) of 200g, add in the organic solution of 58 ml hydroxyethyl methacrylates (HEMA) and 58ml toluene, mix and stir;
2, take by weighing 5g Solsperse-6000 hyper-dispersant and add in the 1st step slurry, mix, make suspended nitride;
3, measure 0.75g benzoyl peroxide (catalyst) and 1.3 ml dimethylanilines (initator) respectively and add in the suspended nitride, slowly pour pre-prepd mould after stirring into, curing molding at normal temperatures after the injection obtains the pipe fitting base substrate;
4, the pipe fitting base substrate is placed on the drying box inner drying 48h of 70 ℃ of constant temperature;
5, with dried stainless steel pipe base substrate in vacuum 3.5 * 10
-2Intensification sintering under the Pa.Temperature control: below 500 ℃ the time, programming rate is 1 ℃/min, and wherein at 300 ℃ of insulation 2 h, 500 ~ 1050 ℃ of following programming rates are 4 ℃/min, and in 1400 ℃ of insulation 2 h sintering, finally obtain ultra-thin-wall POROUS TITANIUM pipe fitting goods.Wherein dimensional accuracy 0.5%, weight dispersion degree ± 0.8%, porosity is 68%, pore size is 50 ~ 100um.
Claims (4)
1. plant the manufacturing process of ultra-thin-wall porous metals pipe fitting, its characteristic comprises following processing step:
(1) making of mould: process the pipe fitting of required size, after the inwall outer wall is evenly smeared the very thin vaseline of one deck, vertically be placed on smooth place, the iron sheet that makes a circle in week prevents silica gel seepage in the casting process; The mixed that silica gel and curing agent are pressed 100:0.5 ~ 1.5 evenly after, the silica gel that will have good fluidity slowly pours into around the pipe fitting, and silica gel is fully contacted with pipe fitting, after fully solidifying through 10 ~ 48h, the taking-up pipe fitting, mould is for use;
(2) suspended nitride preparation: with organic monomer and organic solvent by volume 1 ~ 120:1 mix; Add the dispersant that is pre-mixed uniform alloy powder and pore creating material and quality 0.05 ~ 5 wt% thereof; After stirring; The catalyst and the initator that add 0.1 ~ 3.5 wt%, and simultaneous vacuum deaeration pour into the said mould of step (1) after then it being stirred;
(3) solidified forming: the described suspended nitride of step (2) is slowly poured in the said mould of step (1), and curing molding under the normal temperature is controlled between 30 s ~ 30 min hardening time; Place under vacuum drying chamber or inherent 30 ~ 90 ℃ of scopes of protective atmosphere the base substrate after solidifying dry;
(4) sintering: 1000 ~ 1400 ℃ of sintering obtained final thickness in 0.5 ~ 2 hour and reach 1.5mm ultra-thin-wall porous metals pipe fitting under vacuum or protective atmosphere.
2. according to the manufacturing process of the said ultra-thin-wall porous metals of claim 1 pipe fitting, it is characterized in that the said pore creating material of step (2) is glucose, sucrose or urea.
3. according to the manufacturing process of the said ultra-thin-wall porous metals of claim 1 pipe fitting; It is characterized in that the organic monomer in the said suspended nitride preparation of step (2) is hydroxyethyl methacrylate (HEMA) or EMA (EMA) or trimethyl propane three acrylates (TMPTA), organic solvent is toluene or gasoline or long-chain alcohol.
4. according to the manufacturing process of the described ultra-thin-wall porous metals of claim 1 pipe fitting; It is characterized in that the said dispersant of step (2) is Solsperse-6000 hyper-dispersant or oleic acid or polyacrylate; Catalyst is benzoyl peroxide (BPO), and initator is dimethylaniline or ammonium persulfate or potassium peroxydisulfate.
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Cited By (7)
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| CN103350229A (en) * | 2013-07-05 | 2013-10-16 | 北京科技大学 | Gel ultrasonic concussion forming method for metal parts |
| CN103846445A (en) * | 2012-12-03 | 2014-06-11 | 长沙聚众冶金科技有限公司 | Production method of high-length-diameter-ratio high-precision thin walled parts |
| CN104841208A (en) * | 2015-04-17 | 2015-08-19 | 成都易态科技有限公司 | Flue gas filtration system |
| CN105884339A (en) * | 2016-04-14 | 2016-08-24 | 上海大学 | Method for preparing straight-pass-type air supply aluminum oxide element with gel casting technique |
| CN107876775A (en) * | 2017-10-27 | 2018-04-06 | 兰州理工大学 | A kind of porous Ti of structure-controllable low damage processing method |
| CN112453399A (en) * | 2020-11-17 | 2021-03-09 | 太原科技大学 | Composite pore structure foamed aluminum and preparation process thereof |
| CN113262324A (en) * | 2021-05-19 | 2021-08-17 | 辽宁工业大学 | Multi-phase gradient-distributed porous Zn-Ag-TCP composite material and preparation method thereof |
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| CN112453399A (en) * | 2020-11-17 | 2021-03-09 | 太原科技大学 | Composite pore structure foamed aluminum and preparation process thereof |
| CN113262324A (en) * | 2021-05-19 | 2021-08-17 | 辽宁工业大学 | Multi-phase gradient-distributed porous Zn-Ag-TCP composite material and preparation method thereof |
| CN113262324B (en) * | 2021-05-19 | 2022-01-18 | 辽宁工业大学 | Multi-phase gradient-distributed porous Zn-Ag-TCP composite material and preparation method thereof |
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