CN106363174B - A kind of preparation method of the thin-wall special-shaped part of foamed aluminium - Google Patents
A kind of preparation method of the thin-wall special-shaped part of foamed aluminium Download PDFInfo
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- CN106363174B CN106363174B CN201610822707.XA CN201610822707A CN106363174B CN 106363174 B CN106363174 B CN 106363174B CN 201610822707 A CN201610822707 A CN 201610822707A CN 106363174 B CN106363174 B CN 106363174B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
- B22F3/1125—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers involving a foaming process
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Abstract
The present invention relates to a kind of preparation methods of the thin-wall special-shaped part of foamed aluminium, belong to porous metal material technical field.Use three one-step forming techniques in the preparation of expandable prefabricated blank, i.e., increase multi pass drawing process again on the basis of traditional cold pressing+hot extrusion, prepared diameter 2-5mm the expandable prefabricated blank of threadiness.In thin-wall special-shaped part preparation process, it only need to be according to the density requirements of the wall thickness and sandwich layer foams of profiled piece, select the expandable prefabricated blank of threadiness of suitable diameter, after being folded using rational folding mode, in the merging metal mold cavity compound with it, it is placed in thermal insulation foaming in holding furnace together, no longer needs to take a substantial amount of time the expandable prefabricated blank for preparing multiple small sizes that more green body foamings need.The present invention substantially increases production efficiency, reduces production cost, to pushing the process of industrialization of the thin-wall special-shaped part of foamed aluminium to have very positive meaning.
Description
Technical field
The present invention relates to a kind of preparation methods of the thin-wall special-shaped part of foamed aluminium, belong to porous metal material technical field.
Background technology
Foamed aluminium profiled piece is exactly by foamed aluminium and certain material（Steel, aluminium, copper etc.）Formation is with foamed aluminium after compound
The three-dimensional structure of core material.Its both lightweight with foamed aluminium, Gao Biqiang, sound absorption, heat-insulated, fire-retardant, vibration damping, damping, absorption
The characteristics of impact etc. is had excellent performance, while solving the relatively low disadvantage of single foamed aluminium intensity again, it is a kind of excellent combination property
Novel lightweight material.Therefore there is huge open in the industries such as communications and transportation, Aeronautics and Astronautics, especially auto industry
Send out potentiality and wide application prospect.
Foamed aluminium profiled piece is complex-shaped as a kind of 3 D stereo component, is difficult to adopt newest Rolling compund, accumulation
It is prepared by the production technologies of the battenboards such as ply rolling.And traditional gluing technique, due to belonging to physical connection, bond strength is relatively low,
High temperature resistant, corrosion resistance are poor, and application range is also extremely limited.The expandable precursor of powder metallurgy foaming technology utilization is in closo
Intracavitary heat preservation, expansion, the mode that is finally integrated into a whole with external form prepare profiled piece, have short route, near-net-shape
The characteristics of, it is considered to be a kind of preparation process of current most foamed aluminium profiled piece of potentiality to be exploited.
However, traditional powder metallurgic method, is that will use single way stempressing or squeeze the expandable precursor prepared, directly
It is placed in thermal insulation foaming in closed cavity, due to profile shape complexity, generally requires the side of the i.e. more green body foaming of multiple prefabricated blanks
Formula could be realized.And when profiled piece wall thickness is smaller, also there are many very little, quantity for the size of the expandable precursor needed, often
Need longer time that could prepare completion, this greatly reduces production efficiency, improves production cost, seriously hinders foamed aluminium
The process of industrialization of thin-wall special-shaped part.
Invention content
Goal of the invention：It is an object of the invention to overcome problems of the prior art, a kind of foamed aluminium thin-walled is provided
The preparation method of profiled piece, while improving production efficiency, reducing production cost, the industrialization for the thin-wall special-shaped part of foamed aluminium provides
Necessary technical support.
Technical solution：
A kind of preparation method of the thin-wall special-shaped part of foamed aluminium, it is characterised in that：This approach includes the following steps：
（1）The mixing of powder：Raw material aluminium powder and foaming agent hydride powder are uniformly mixed；
（2）The preparation of precast body：By step（1）In the powder that mixes using being first cold-pressed, then hot extrusion, last multi-pass
The mode of drawing prepares linear expandable prefabricated blank；
（3）The preparation of foamed aluminium profiled piece：According to the lumen thickness of metal mold cavity, select the threadiness of suitable diameter expandable
Prefabricated blank；According to the density requirements of sandwich layer the cavity of the metal compound with it is placed in after folding linear expandable prefabricated blank
In, it is then transferred into after being kept the temperature in holding furnace, is transferred in foaming furnace and foams, can be prepared by using foamed aluminium as core after cooling
Layer is using composition metal as the thin-wall special-shaped structural member on surface layer：
Wherein：
The step（1）In foaming agent hydride powder granularity be 25 μm or less；The foaming agent hydride powder uses
120 minutes treatment process of heated oxide in 480 DEG C of air；
The step（1）The additive amount of middle foaming agent hydride powder is the 0.1-0.2% of precast body gross mass, remaining is aluminium
Powder.
A kind of preparation method of the thin-wall special-shaped part of foamed aluminium, it is characterised in that：The step（2）Middle precast body
Preparation method uses three one-step formings：
Mixed-powder is first pressed into the cold pressing base of high-compactness by the first step by the way of 500MP cold pressings；
Second step will be cold-pressed base and be put into holding furnace after 400 DEG C of Heat preservations 90-120 minutes, be quickly transferred to preheat
It is squeezed in good extrusion die；
Crowded base is carried out multi pass drawing by third step, is finally made linear expandable prefabricated blank.
A kind of preparation method of the thin-wall special-shaped part of foamed aluminium, it is characterised in that：The step（2）Middle extrusion ratio is
Not less than 30:1, the preheating temperature of extrusion die and pressure head is 390 DEG C ± 20 DEG C, the cross-sectional diameter of obtained circular extrusion base
For 12-15mm.
A kind of preparation method of the thin-wall special-shaped part of foamed aluminium, it is characterised in that：The step（2）Middle extruded stock is more
In passage drawing process, every time reduction of area controls between 15-20%, prefabricated blank before the 1st passage and the 6th passage drawing
400 DEG C of heating, 60 minutes heat treatment process are all made of, threadiness expandable prefabricated blank of the diameter between 2-5mm is finally prepared.
A kind of preparation method of the thin-wall special-shaped part of foamed aluminium, it is characterised in that：The step（3）In, according to thin
The wall thickness of wall profiled piece requires the expandable prefabricated blank of threadiness of selection suitable diameter, will according to the density requirements of sandwich layer foams
After linear expandable prefabricated blank folds, in the merging cavity compound with it, finally it is put into holding furnace, thermal insulation foaming.
A kind of preparation method of the thin-wall special-shaped part of foamed aluminium, it is characterised in that：The step（3）In, holding furnace
Holding temperature be 550-580 DEG C, soaking time be 40-50 minutes, wait for that the temperature of linear prefabricated blank and metal shape all reaches
After the set temperature of holding furnace, be transferred into foaming furnace foam rapidly, the temperature of foaming furnace be set in 720-750 DEG C it
Between, the thermal insulation foaming time between 120-180 seconds, waits for that foams are full of entire cavity, combines closely with metallic walls, is formed special-shaped
It is cooled down rapidly after structure, the type of cooling is that water cooling or water mist are cold.
Advantage and effect：
（1）The thin-wall special-shaped part of foamed aluminium, since wall thickness is relatively thin, the size of the expandable prefabricated blank of use is smaller, foams
Cheng Zhong, heat absorption speed is fast, fusing time is short, foaming agent utilization rate is high, blowing power is strong, and the hydrogen that titantium hydride decomposes release holds very much
The constraint for easily breaking through coating metal, overflows foams, to cause caving in for foam, the serious quality for reducing sandwich layer foams.
Therefore this technique uses small particle, the scheme of few additive in the design of foaming agent.The titantium hydride of small particle can make foam
Body is in growth course, and number of bubbles increases in unit volume, and the driving force that foams is constant, and the average force of single isolated bubbles subtracts
Small, the stability of foams growth increases, and bubble, which merges, uniformly to carry out, and is not in and to be generated because of partial foaming hyperenergia
Macropore, even overflows external phenomenon at through-hole, to can guarantee consistency, the uniformity of pore structure of pore size.Low addition
The titantium hydride of amount, under the premise of thin-wall special-shaped part infusion utilization rate occurred frequently, not but not reduce sandwich layer foams expansion rate,
It can make that foaming process is more stable instead, moreover it is possible to further increase the expansion rate of foams；
（2）Three one-step forming techniques are used in the preparation of expandable prefabricated blank, are reheated after traditional cold pressing base
Drawing procedure is increased on the basis of the two one-step forming techniques squeezed, i.e., extruded stock obtained after hot extrusion is used into multi-pass again
The mode of drawing finally prepares linear expandable prefabricated blank.It, only need to be according to profiled piece in thin-wall special-shaped part preparation process
The density requirements of wall thickness and sandwich layer foams select the expandable prefabricated blank of threadiness of suitable diameter, using rational folding mode,
After linear expandable prefabricated blank is folded, in the merging metal mold cavity compound with it, being placed in thermal insulation foaming in holding furnace together is
It can.After taking a substantial amount of time the expandable prefabricated blank for preparing multiple small sizes, then by the way of the foaming of more green bodies
To prepare thin-wall special-shaped part.The present invention substantially increases production efficiency, reduces production cost, to pushing foamed aluminium thin-wall special-shaped
The process of industrialization of part has very positive meaning.
（3）By the way of the foaming of more green bodies, each small foaming prefabricated blank, due to not preparing simultaneously, in consistency
More or less all has a certain difference.In foaming process, each small foaming precursor must in Initial Dilatation time, expansion rate
So there is also certain differences.Therefore also can be more or less between final obtained thin-wall special-shaped part each section that there are some is close
Difference is spent, to influence the comprehensive performance of profiled piece.The expandable prefabricated blank that this technique uses is obtained one under identical conditions
Whole expandable prefabricated blank of threadiness all keeps the consistent of height in alloying component and consistency, therefore final obtained thin
It, will well very compared with more green body foamings in the consistency of density, the uniformity of pore structure between wall profiled piece each section
More, comprehensive performance is also far above thin-wall special-shaped parts prepared by more green body foamings, this industry to the thin-wall special-shaped part of foamed aluminium
It is also highly beneficial to change.
Description of the drawings：
The folding mode schematic diagram of the linear expandable prefabricated blanks of Fig. 1；
The preparation technology flow chart of the thin-wall special-shaped part of Fig. 2 foamed aluminiums.
Specific implementation mode：
The present invention is a kind of preparation method of the thin-wall special-shaped part of foamed aluminium, and steps are as follows for this method：
（1）The mixing of powder：First by foaming agent TiH2Powder is using 120 minutes places of heated oxide in 480 DEG C of air
Then science and engineering skill selects grain size in 25 μm of TiH below by the way of vibrating screen screening2Particle makees foaming agent, by quality hundred
Divide the ratio than 0.1-0.2% to be added in matrix aluminium powder, finally mixed-powder is put on ball mill and is mixed, incorporation time is
120 minutes.
（2）The preparation of precast body：The preparation method of precast body uses three one-step formings：The first step first uses 500MP cold pressings
Mixed-powder is pressed into the cold pressing base that high-compactness reaches by mode.Second step will be cold-pressed base and be put into holding furnace the heat preservation at 400 DEG C
It after heating 90-120 minutes, is quickly transferred to be squeezed in extrusion die, wherein the extrusion ratio of extrusion die is not less than 30:
1, the preheating temperature of extrusion die and pressure head is 390 DEG C（Temperature fluctuates deviation and is no more than 20 DEG C up and down）, obtained circular extrusion
The cross-sectional diameter of base is 12-15mm.Third step carries out multi pass drawing to extruded stock, and the control of every time reduction of area exists
Between 15-20%, prefabricated blank is all made of 400 DEG C of heating, 60 minutes heat treatment process before the 1st passage and the 6th passage drawing, final to make
It is standby go out threadiness expandable prefabricated blank of the diameter between 2-5mm.
（3）The preparation of foamed aluminium profiled piece：Require the threadiness of selection suitable diameter that can send out according to the wall thickness of thin-wall special-shaped part
Prefabricated blank is steeped, is folded linear expandable prefabricated blank using rational folding mode according to the density requirements of sandwich layer foams
Afterwards, it is placed in the cavity compound with it, is placed in 550-580 DEG C of holding furnace together, keep the temperature 40-50 minutes, wait for linear prefabricated blank
After the set temperature for all reaching heat preservation stove with the temperature of metal shape, it is transferred into foaming furnace foams rapidly, foaming furnace
Temperature be set between 720-750 DEG C, the thermal insulation foaming time between 120-180 seconds, wait for foams be full of entire cavity, with
Metallic walls are combined closely, and form abnormally-structured rear rapid cooling, the type of cooling is that water cooling or water mist are cold.
The folding mode of linear expandable prefabricated blank is as shown in Figure 1, wherein d is the diameter of linear expandable prefabricated blank, 2-
5mm；D is the folding spacing of expandable prefabricated blank, calculates and obtains according to the density requirements of thin-wall special-shaped part sandwich layer foams；H is thin
The height of wall profiled piece；L is the total length of thin-wall special-shaped part.Since thin-wall special-shaped part is not for the cuboid of rule, figure
Middle H, L are the summation of each section of height or length, the H of each segmentIt is small、LIt is smallIt is suitably adjusted according to the shape of profiled piece.
The foamed aluminium special-shaped structure piece prepared using this technique, the density of sandwich layer foams is in 0.65g/cm3-1.35g/cm3
Between, sandwich layer foam thickness is between 2-5mm.
This method uses small particle, the scheme of few additive in the design of foaming agent, bubble stabilization can be made to grow,
Bubble, which merges, uniformly to carry out, and is not in and to generate macropore because of partial foaming hyperenergia, through-hole, even overflow external show
As to can guarantee consistency, the uniformity of pore structure of pore size.
Invention is further explained in the following with reference to the drawings and specific embodiments：
Embodiment 1
The preparation of precast body：
Granularity after 480 DEG C of heated oxides are handled 120 minutes is less than 25 μm of TiH2Powder is put into roller batch mixing with aluminium powder
It is mixed on machine, incorporation time is 120 minutes, wherein TiH2Additive amount is 0.1%, and surplus is aluminium powder.Next it will mix equal
In even powder merging cylindrical die, it is pressurized to 500MPa, mixed-powder is pressed into cylindrical cold pressing by pressurize 10 minutes
Base.It will be cold-pressed base after demoulding, be placed in Heat preservation 120 minutes in 400 DEG C of holding furnace, be then quickly transferred to 30：1 preheating
Hot extrusion is carried out in good extrusion die（The preheating temperature of extrusion die and pressure head is 390 DEG C）, it is prepared into squeezing for diameter 12mm
Green compact.Multi pass drawing finally is carried out to extruded stock, prefabricated blank is all made of 400 DEG C of heating 60 before the 1st passage and the 6th passage drawing
Minute heat treatment process, every time reduction of area are controlled 15% or so, and it is left that extruded stock is finally drawn into a diameter of 2mm
The right expandable prefabricated blank of threadiness,
The preparation of foamed aluminium profiled piece：
After linear expandable prefabricated blank is folded in the merging metal mold cavity compound with it, after then loading first
Be put into 550 DEG C, holding furnace in, keep the temperature 50 minutes, wait for that the temperature of linear prefabricated blank and metal shape all reaches holding furnace
It after the set temperature of son, is transferred into foaming furnace foams rapidly, the temperature of foaming furnace is set in 720 DEG C, when thermal insulation foaming
Between at about 180 seconds, wait for that foams are full of entire cavity, combine closely with metallic walls, formed it is abnormally-structured after it is rapid cooling, it is cold
But mode is that water cooling or water mist are cold.The thin-wall special-shaped structural member of foamed aluminium prepared using this technique, the density of sandwich layer foams
In about 1.35g/cm3, sandwich layer foam thickness is in about 2mm.
Embodiment 2
The preparation of precast body：
Granularity after 480 DEG C of heated oxides are handled 120 minutes is less than 25 μm of TiH2Powder is put into roller batch mixing with aluminium powder
It is mixed on machine, incorporation time is 120 minutes, wherein TiH2Additive amount is 0.2%, and surplus is aluminium powder.Next it will mix equal
In even powder merging cylindrical die, it is pressurized to 500MPa, mixed-powder is pressed into cylindrical cold pressing by pressurize 10 minutes
Base.It will be cold-pressed base after demoulding, be placed in Heat preservation 90 minutes in 400 DEG C of holding furnace, be then quickly transferred to 30：1 preheating
Hot extrusion is carried out in good extrusion die（The preheating temperature of extrusion die and pressure head is 390 DEG C）, it is prepared into squeezing for diameter 15mm
Green compact.Multi pass drawing finally is carried out to extruded stock, prefabricated blank is all made of 400 DEG C of heating 60 before the 1st passage and the 6th passage drawing
Minute heat treatment process, every time reduction of area are controlled 20% or so, and it is left that extruded stock is finally drawn into a diameter of 5mm
The right expandable prefabricated blank of threadiness,
The preparation of foamed aluminium profiled piece：
After linear expandable prefabricated blank is folded in the merging metal mold cavity compound with it, after then loading first
It is put into 580 DEG C of holding furnace, keeps the temperature 40 minutes, wait for that the temperature of linear prefabricated blank and metal shape all reaches heat preservation stove
Set temperature after, be transferred into foaming furnace foam rapidly, the temperature of foaming furnace is set in 750 DEG C, the thermal insulation foaming time
It about 120 seconds, waits for that foams are full of entire cavity, combines closely with metallic walls, form abnormally-structured rear rapid cooling, cooling side
Formula is that water cooling or water mist are cold.The thin-wall special-shaped structural member of foamed aluminium prepared using this technique, the density of sandwich layer foams is about
For 0.65g/cm3, sandwich layer foam thickness is in about 5mm.
Embodiment 3
The preparation of precast body：
Granularity after 480 DEG C of heated oxides are handled 120 minutes is less than 25 μm of TiH2Powder is put into roller batch mixing with aluminium powder
It is mixed on machine, incorporation time is 120 minutes, wherein TiH2Additive amount is 0.15%, and surplus is aluminium powder.It next will mixing
In uniform powder merging cylindrical die, it is pressurized to 500MPa, mixed-powder is pressed into cylindrical cold pressing by pressurize 10 minutes
Base.It will be cold-pressed base after demoulding, be placed in Heat preservation 105 minutes in 400 DEG C of holding furnace, be then quickly transferred to 30：1 preheating
Hot extrusion is carried out in good extrusion die（The preheating temperature of extrusion die and pressure head is 390 DEG C）, it is prepared into diameter 13.5mm's
Extruded stock.Multi pass drawing finally is carried out to extruded stock, prefabricated blank is all made of 400 DEG C of heating before the 1st passage and the 6th passage drawing
60 minutes heat treatment process, every time reduction of area are controlled 17.5% or so, are finally drawn into extruded stock a diameter of
The expandable prefabricated blank of threadiness of 3.5mm or so,
The preparation of foamed aluminium profiled piece：
After linear expandable prefabricated blank is folded in the merging metal mold cavity compound with it, after then loading first
It is put into 565 DEG C of holding furnace, keeps the temperature 45 minutes, wait for that the temperature of linear prefabricated blank and metal shape all reaches heat preservation stove
Set temperature after, be transferred into foaming furnace foam rapidly, the temperature of foaming furnace is set in 735 DEG C, the thermal insulation foaming time
It about 150 seconds, waits for that foams are full of entire cavity, combines closely with metallic walls, form abnormally-structured rear rapid cooling, cooling side
Formula is that water cooling or water mist are cold.The thin-wall special-shaped structural member of foamed aluminium prepared using this technique, the density of sandwich layer foams is about
For 1.0g/cm3, sandwich layer foam thickness is in about 3.5mm.
Claims (4)
1. a kind of preparation method of the thin-wall special-shaped part of foamed aluminium, it is characterised in that：This approach includes the following steps：
（1）The mixing of powder：Raw material aluminium powder and foaming agent hydride powder are uniformly mixed；
（2）The preparation of precast body：By step（1）In the powder that mixes using being first cold-pressed, then hot extrusion, last multi pass drawing
Mode, prepare linear expandable prefabricated blank；
（3）The preparation of foamed aluminium profiled piece：According to the lumen thickness of metal mold cavity, select the threadiness of suitable diameter expandable prefabricated
Base；It is placed in the cavity of the metal compound with it, so after folding linear expandable prefabricated blank according to the density requirements of sandwich layer
After be transferred to and kept the temperature in holding furnace after, be transferred in foaming furnace and foam, can be prepared by after cooling using foamed aluminium as sandwich layer with
Composition metal is the thin-wall special-shaped structural member on surface layer：
Wherein：
The step（1）In foaming agent hydride powder granularity be 25 μm or less；The foaming agent hydride powder uses 480 DEG C
120 minutes treatment process of heated oxide in air；
The step（1）The additive amount of middle foaming agent hydride powder is the 0.1-0.2% of precast body gross mass, remaining is aluminium powder；
The step（2）The preparation method of middle precast body uses three one-step formings：
Mixed-powder is first pressed into the cold pressing base of high-compactness by the first step by the way of 500MP cold pressings；
Second step will be cold-pressed base and be put into holding furnace after 400 DEG C of Heat preservations 90-120 minutes, be quickly transferred to preheated
It is squeezed in extrusion die；
Crowded base is carried out multi pass drawing by third step, is finally made linear expandable prefabricated blank；
The step（2）Middle extrusion ratio is not less than 30:1, the preheating temperature of extrusion die and pressure head is 390 DEG C ± 20 DEG C, is obtained
The cross-sectional diameter of the circular extrusion base arrived is 12-15mm.
2. a kind of preparation method of the thin-wall special-shaped part of foamed aluminium according to claim 1, it is characterised in that：The step
（2）During middle extruded stock multi pass drawing, every time reduction of area controls between 15-20%, the 1st passage and the 6th passage
Prefabricated blank is all made of 400 DEG C of heating, 60 minutes heat treatment process before drawing, and finally preparing threadiness of the diameter between 2-5mm can
Foam prefabricated blank.
3. a kind of preparation method of the thin-wall special-shaped part of foamed aluminium according to claim 1, it is characterised in that：The step
（3）In, the expandable prefabricated blank of threadiness of selection suitable diameter is required according to the wall thickness of thin-wall special-shaped part, according to sandwich layer foams
Density requirements after folding linear expandable prefabricated blank, in the merging cavity compound with it, are finally put into holding furnace, keep the temperature
Foaming.
4. a kind of preparation method of the thin-wall special-shaped part of foamed aluminium according to claim 3, it is characterised in that：The step
（3）In, the holding temperature of holding furnace is 550-580 DEG C, and soaking time is 40-50 minutes, waits for linear prefabricated blank and metal shape
Temperature all reach the set temperature of holding furnace after, be transferred into foaming furnace foam rapidly, the temperature of foaming furnace is set in
Between 720-750 DEG C, the thermal insulation foaming time between 120-180 seconds, waits for that foams are full of entire cavity, is closely tied with metallic walls
It closes, forms abnormally-structured rear rapid cooling, the type of cooling is that water cooling or water mist are cold.
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| CN107552793B (en) * | 2017-09-15 | 2019-09-27 | 中国民航大学 | A kind of preparation method of foamed aluminium filling in situ thin-wall tube |
| CN111331138B (en) * | 2020-02-19 | 2021-11-16 | 北京锦灏科技有限公司 | Method for preparing foam metal thin-wall composite pipe with controllable filling density gradient |
| CN111842898B (en) * | 2020-08-06 | 2022-07-19 | 航天特种材料及工艺技术研究所 | Powder metallurgy diffusion method for preparing foamed aluminum, foamed aluminum prepared by powder metallurgy diffusion method and sandwich foamed aluminum plate |
| CN112122611B (en) * | 2020-09-25 | 2022-07-05 | 航天特种材料及工艺技术研究所 | Foam aluminum with sandwich structure and preparation method thereof |
| CN118003540B (en) * | 2024-04-09 | 2024-06-04 | 太原理工大学 | Foam metal filled seamless composite pipe heat treatment foaming device and preparation method |
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| JPH08209266A (en) * | 1995-02-06 | 1996-08-13 | Hitachi Cable Ltd | Production of porous metallic wire |
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| CN101172303A (en) * | 2007-10-26 | 2008-05-07 | 东南大学 | Method for producing bubble aluminum alloy special-shaped member with even pore structure |
| CN103589892A (en) * | 2013-11-29 | 2014-02-19 | 沈阳工业大学 | Low density and small pore size powder metallurgy foam aluminum composite structure preparation method |
| CN104550972A (en) * | 2014-12-05 | 2015-04-29 | 沈阳工业大学 | Preparation method of new special-shaped aluminum foam irregular parts |
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