CN102554228B - Method for forming ultrathin-wall porous metal pipe fitting - Google Patents
Method for forming ultrathin-wall porous metal pipe fitting Download PDFInfo
- Publication number
- CN102554228B CN102554228B CN 201210009548 CN201210009548A CN102554228B CN 102554228 B CN102554228 B CN 102554228B CN 201210009548 CN201210009548 CN 201210009548 CN 201210009548 A CN201210009548 A CN 201210009548A CN 102554228 B CN102554228 B CN 102554228B
- Authority
- CN
- China
- Prior art keywords
- pipe fitting
- porous metal
- ultrathin
- metal pipe
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Powder Metallurgy (AREA)
- Catalysts (AREA)
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
Technical field
The present invention relates to a kind of ultrathin-wall porous metal pipe fitting manufacturing process, belong to metallic element preparation field in powder metallurgical production technique, a kind of gel injection-moulding shape technology of near-net-shape ultrathin-wall porous metal pipe fitting particularly is provided.
Technical background
Porous metal pipe fitting is mainly used in the filtration of poly-vinegar, oil product, pharmacy, food and drink and chemical products, also is used for the filtration of water and air etc.It has the characteristics such as excellent corrosion resistance, non-oxidizability, wearability, mechanical property (ductility and impact strength), and have that manufacturing process is simple, long service life, the characteristics such as renewable, also have in addition the properties such as permeability, noise reduction, 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 perforated pipe is a lot, and wherein the most frequently used have hydrostatic pressing, die forming and a plasticising extruding.
Hydrostatic pressing is applicable to prepare large pipe, its shortcoming is that productivity ratio is low, the pressed compact size is restive, in order to obtain final pressed compact size, often need pressed compact is processed again, and the pressed compact wall thickness that general the method is produced all can not be too thin, and is easily broken in the process of the demoulding, and pipe range is subjected to the restriction of die length.
Die forming is only applicable to L/D ratio and is not more than 3 tubing, and usually all causes the inhomogeneities of green density, 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 needed to weld just and can reach required size.
Plasticising extruding (be as the patent No. 200910219595.9 patent) is a kind of effective ways of producing long and thin porous tubing.The porous material density that is shaped in this way is even.Because extrusion modling pressure is low, contain again a large amount of volatilizable plasticizer in material, therefore 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 ultrathin-wall porous metal 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.
At first this technology is that metal dust and pore creating material are mixed with the stable gel rubber system premixed liquid for preparing in advance, makes the suspended nitride of good fluidity, injects tubular die and is solidified into base substrate, sinters at last part into, and concrete technical matters is as follows:
1, the making of mould: process the pipe fitting of required size, vertically be placed on smooth place evenly smear the vaseline of thin layer at the inwall outer wall after, the surrounding iron sheet that makes a circle prevents silica gel seepage in casting process.Silica gel and the curing agent ratio in 100:0.5 ~ 1.5 is mixed.The silica gel that will have good fluidity slowly pours into the pipe fitting surrounding, and silica gel is fully contacted with pipe fitting.After fully solidifying through 10 ~ 48h, take out pipe fitting, mould is stand-by.
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%.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 in premixed liquid, 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 successively the catalyst of 0.1 ~ 3.5 wt%.
3, solidified forming: above-mentioned slurry is slowly poured in mould, curing molding under normal temperature, generally with curing time control between 30 s ~ 30 min.Base substrate after solidifying is placed in (30 ~ 90 ℃) drying in vacuum drying chamber or protective atmosphere.
4, sintering: 1000 ~ 1400 ℃ of sintering obtained final ultra-thin-wall (thickness can reach 1.5mm) porous metal 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 mobility uniformly, has solved preparation thin-wall pipe shaping hard problem, can prepare the pipe fitting of ultra-thin-wall, and blank has higher precision; Secondly, can by controlling content and the granularity of pore creating material, regulate porosity and the pore size of product; At last, because content of organics in molding blank is low, do not need special degreasing process, reduced the flow process of producing.Molding blank has certain intensity, guaranteed that after the moulding, the transportation of blank is shifted, and die cost is very low, makes production cost reduce.
Compare with the pressure forming technology, its advantage is:
1, due to metal suspension gel slurry good fluidity, can fill easily the mould of ultra-thin-wall pipe fitting, needing owing to being shaped to have avoided the limited and energy consumption issues of the excessive complex character that causes of pressure, greatly improved molding condition;
2, can by regulating content and the granularity of pore creating material, control porosity and the pore size of product.
3, this technology only need add the organic matter of less than 5 wt%, does not need special degreasing process, and technique is simple, and production cost is significantly reduced.
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, take 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 blend;
2, take 3g Solsperse-6000 hyper-dispersant and add in the 1st step slurry, mix, make suspended nitride;
3, measure respectively 0.4g benzoyl peroxide (catalyst) and 1.5 ml dimethylanilines (initator) add in suspended nitride, slowly pour pre-prepd mould after stirring into, curing molding at normal temperatures after 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
-2Sintering heats up under Pa.Temperature is controlled: below 500 ℃ the time, programming rate is 1 ℃/min, and wherein at 300 ℃ of insulation 2 h, 500 ~ 1050 ℃ of lower programming rates are 4 ℃/min, and in 1050 ℃ of insulation 2 h sintering, finally obtain ultra-thin-wall porous stainless steel pipe fitting goods.Dimensional accuracy＜0.5% wherein, weight dispersion degree ± 1%, porosity is 62.4%, pore size is 50 ~ 100um.
Embodiment 2: thin-wall titanium pipe fitting goods (external diameter 90mm, wall thickness 3mm, height 170mm, porosity is 68%, pore size is 50 ~ 100um) gel casting
1, take 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 blend;
2, take 5g Solsperse-6000 hyper-dispersant and add in the 1st step slurry, mix, make suspended nitride;
3, measure respectively 0.75g benzoyl peroxide (catalyst) and 1.3 ml dimethylanilines (initator) add in suspended nitride, slowly pour pre-prepd mould after stirring into, curing molding at normal temperatures after 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
-2Sintering heats up under Pa.Temperature is controlled: below 500 ℃ the time, programming rate is 1 ℃/min, and wherein at 300 ℃ of insulation 2 h, 500 ~ 1050 ℃ of lower programming rates are 4 ℃/min, and in 1400 ℃ of insulation 2 h sintering, finally obtain ultra-thin-wall POROUS TITANIUM pipe fitting goods.Dimensional accuracy＜0.5% wherein, weight dispersion degree ± 0.8%, porosity is 68%, pore size is 50 ~ 100um.
Claims (1)
1. the manufacturing process of a ultrathin-wall porous metal pipe fitting, its feature comprises following processing step:
(1) making of mould: process the pipe fitting of required size, vertically be placed on smooth place evenly smear the vaseline of thin layer at the inwall outer wall after, the iron sheet that makes a circle in week prevents silica gel seepage in casting process; After silica gel and curing agent were mixed in the ratio of 100:0.5 ~ 1.5, the silica gel that will have good fluidity slowly poured into the pipe fitting surrounding, and silica gel is fully contacted with pipe fitting, after fully solidifying through 10 ~ 48h, takes out pipe fitting, and mould is stand-by;
(2) suspended nitride preparation: with hydroxyethyl methacrylate or EMA or trimethyl propane three acrylates and toluene or gasoline or long-chain alcohol by volume 1 ~ 120:1 mix, add and be pre-mixed uniform alloy powder and glucose, sucrose or urea as pore creating material and quality 0.05 ~ 5 wt%Solsperse-6000 hyper-dispersant thereof or oleic acid or polyacrylate as dispersant, after stirring, the benzoyl peroxide that adds 0.1 ~ 3.5 wt% as catalyst and dimethylaniline or ammonium persulfate or potassium peroxydisulfate as initator, and simultaneous vacuum deaeration, then pour into the described mould of step (1) after it being stirred,
(3) solidified forming: the described suspended nitride of step (2) is slowly poured in the described mould of step (1), curing molding under normal temperature, curing time control is between 30 s ~ 30 min; Be placed under vacuum drying chamber or protective atmosphere 30 ~ 90 ℃ of inherences scope the base substrate after solidifying dry;
(4) sintering: 1000 ~ 1400 ℃ of sintering obtained final thickness in 0.5 ~ 2 hour and reach the 1.5mm ultrathin-wall porous metal pipe fitting under vacuum or protective atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210009548 CN102554228B (en) | 2012-01-13 | 2012-01-13 | Method for forming ultrathin-wall porous metal pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210009548 CN102554228B (en) | 2012-01-13 | 2012-01-13 | Method for forming ultrathin-wall porous metal pipe fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102554228A CN102554228A (en) | 2012-07-11 |
| CN102554228B true CN102554228B (en) | 2013-11-06 |
Family
ID=46401593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210009548 Expired - Fee Related CN102554228B (en) | 2012-01-13 | 2012-01-13 | Method for forming ultrathin-wall porous metal pipe fitting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102554228B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103350229B (en) * | 2013-07-05 | 2015-08-12 | 北京科技大学 | A kind of gel ultrasonic vibration manufacturing process of metallic element |
| CN104841208B (en) * | 2015-04-17 | 2017-08-25 | 成都易态科技有限公司 | Flue gas filter 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 |
| CN107876775B (en) * | 2017-10-27 | 2019-11-12 | 兰州理工大学 | A kind of low damage processing method of the porous Ti of structure-controllable |
| CN112453399A (en) * | 2020-11-17 | 2021-03-09 | 太原科技大学 | Composite pore structure foamed aluminum and preparation process 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4894194A (en) * | 1988-02-22 | 1990-01-16 | Martin Marietta Energy Systems, Inc. | Method for molding ceramic powders |
| US6228299B1 (en) * | 1997-09-16 | 2001-05-08 | Ut-Battelle, Llc | Gelcasting compositions having improved drying characteristics and machinability |
| CN1456535A (en) * | 2003-05-30 | 2003-11-19 | 武汉理工大学 | Process for preparing porous ceramic by water-based gel injection moulding method |
| CN1669705A (en) * | 2004-12-31 | 2005-09-21 | 华南理工大学 | Porous inorganic microstraining core and preparation method thereof |
| CN1817510A (en) * | 2006-03-21 | 2006-08-16 | 北京科技大学 | Gel mould-injecting formation of nickel-titanium-based shape memory alloy with high porosity |
| CN101279106A (en) * | 2008-05-21 | 2008-10-08 | 北京科技大学 | Preparation of gel injection molding of porous titanium-cobalt alloy medical implant article |
| CN102039412A (en) * | 2011-01-20 | 2011-05-04 | 北京科技大学 | Method for carrying out gel centrifugal forming on metal parts |
-
2012
- 2012-01-13 CN CN 201210009548 patent/CN102554228B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4894194A (en) * | 1988-02-22 | 1990-01-16 | Martin Marietta Energy Systems, Inc. | Method for molding ceramic powders |
| US6228299B1 (en) * | 1997-09-16 | 2001-05-08 | Ut-Battelle, Llc | Gelcasting compositions having improved drying characteristics and machinability |
| CN1456535A (en) * | 2003-05-30 | 2003-11-19 | 武汉理工大学 | Process for preparing porous ceramic by water-based gel injection moulding method |
| CN1669705A (en) * | 2004-12-31 | 2005-09-21 | 华南理工大学 | Porous inorganic microstraining core and preparation method thereof |
| CN1817510A (en) * | 2006-03-21 | 2006-08-16 | 北京科技大学 | Gel mould-injecting formation of nickel-titanium-based shape memory alloy with high porosity |
| CN101279106A (en) * | 2008-05-21 | 2008-10-08 | 北京科技大学 | Preparation of gel injection molding of porous titanium-cobalt alloy medical implant article |
| CN102039412A (en) * | 2011-01-20 | 2011-05-04 | 北京科技大学 | Method for carrying out gel centrifugal forming on metal parts |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102554228A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102554228B (en) | Method for forming ultrathin-wall porous metal pipe fitting | |
| CN105108154B (en) | A kind of method that utilization Powder Injection Molding Technology prepares abnormal complex part | |
| CN101518820B (en) | Method for extruding and molding metal powder gelatin | |
| CN103801696B (en) | Method for preparing powder metallurgy complex shape part by using 3D printing mold | |
| CN103801697B (en) | A kind of metal paste 3D prints without mould gel forming method | |
| CN100449012C (en) | Method of preparing SiCp/Al composite material with complicated shape and high volume percent ratio | |
| CN104446623B (en) | Mullite porous ceramic and preparation method thereof | |
| CN104496480A (en) | Silicon carbide ceramic preform, aluminum-based silicon carbide ceramic material, and preparation method of silicon carbide ceramic preform | |
| CN101774021B (en) | Method for forming big-size complicated shape tungsten product | |
| CN105016751A (en) | Method for preparing zircon refractory material by using particle size distribution combined with gel injection molding process | |
| CN104446487A (en) | Slurry and method for gelcasting pressureless sintered silicon carbide ceramics | |
| CN102151832A (en) | Extrusion forming agent and preparation and use thereof | |
| CN105543526A (en) | Method for preparing high-compactness titanium or titanium alloy by using gel casting formation | |
| CN105312578A (en) | Gel-casting forming method for stainless steel powder | |
| CN104589461A (en) | Ceramic rotary target slip casting die and manufacturing method thereof | |
| CN108017378A (en) | A kind of water-based alumina base 3D printing base substrate method and its forming method | |
| CN103667762A (en) | Preparation method for low-density porous metal material | |
| CN105921752A (en) | Method for preparing invar alloy resonance bar | |
| CN111995425A (en) | Gel casting material composition of aluminum silicon carbide composite material, prefabricated part and preparation method of structural part | |
| JP5399897B2 (en) | Method for producing a masterbatch for injection molding or extrusion molding | |
| CN100382917C (en) | Gel mould-injecting formation of porous titanium with various shape | |
| CN1944482B (en) | Gel polymer for gel injection molding and its preparing method | |
| CN105234414A (en) | Process for manufacturing filter element through low-pressure injection molding | |
| CN102039412B (en) | Method for carrying out gel centrifugal forming on metal parts | |
| CN103465345B (en) | A kind of gel casting forming prepares the method for the dull and stereotyped ITO target base substrate of large gauge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20180113 |