CN106513637A - Preparing method of foamed aluminum sandwich plate - Google Patents
Preparing method of foamed aluminum sandwich plate Download PDFInfo
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- CN106513637A CN106513637A CN201610908524.XA CN201610908524A CN106513637A CN 106513637 A CN106513637 A CN 106513637A CN 201610908524 A CN201610908524 A CN 201610908524A CN 106513637 A CN106513637 A CN 106513637A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 72
- 238000005187 foaming Methods 0.000 claims abstract description 38
- 239000004088 foaming agent Substances 0.000 claims abstract description 31
- 229910000048 titanium hydride Inorganic materials 0.000 claims abstract description 21
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 239000004411 aluminium Substances 0.000 claims description 34
- 239000006260 foam Substances 0.000 claims description 33
- 238000009413 insulation Methods 0.000 claims description 18
- 230000008719 thickening Effects 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000011282 treatment Methods 0.000 claims description 7
- 239000008187 granular material Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 16
- 239000002344 surface layer Substances 0.000 abstract description 6
- 239000007769 metal material Substances 0.000 abstract description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 41
- 239000000956 alloy Substances 0.000 description 41
- 239000000155 melt Substances 0.000 description 15
- 239000010410 layer Substances 0.000 description 12
- 238000007664 blowing Methods 0.000 description 9
- 238000004663 powder metallurgy Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 239000011148 porous material Substances 0.000 description 5
- 230000007812 deficiency Effects 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- GQWNECFJGBQMBO-UHFFFAOYSA-N Molindone hydrochloride Chemical compound Cl.O=C1C=2C(CC)=C(C)NC=2CCC1CN1CCOCC1 GQWNECFJGBQMBO-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Refrigerator Housings (AREA)
Abstract
The invention provides a preparing method of a foamed aluminum sandwich plate and belongs to the field of porous metal materials. Core aluminum alloy (material A) is fused, preserved and tackified at a temperature T1, and a foaming agent TiH2 treated by pre-oxidation is added into the tackified core aluminum alloy melt (material A), stirred and dispersed; a foaming die is preheated to the temperature T1, an aluminum or aluminum alloy plate (material B) is preheated to a temperature T2 which is 10-15 DEG C lower than the solidus temperature of the aluminum or aluminum alloy plate (material B), and the difference between T1 and T2 is 10-20 DEG C; the preheated aluminum or aluminum alloy plate (material B) is padded at the bottom of the die, the tackified core aluminum alloy melt (the material A) containing the TiH2 is poured into the die, and the temperature of the die is controlled at the T1 to carry out heat preservation and foaming; and after the foaming process is finished and cooling is carried out, the foamed aluminum sandwich plate of which the surface layer and a foamed aluminum core are metallurgically combined is obtained, and the thickness of the surface layer of the sandwich plate is controlled through the thickness of a panel.
Description
Technical field
The present invention relates to a kind of preparation method of aluminium foam sandwich plate, belongs to porous metal material field.
Background technology
Aluminium foam sandwich plate is that a kind of surface is aluminum or aluminum alloy solid layer, and sandwich of the core for foamed aluminium, with list
Pure foamed aluminium is compared, with higher specific strength and energy absorption capability, in building, motor vehicles, aircraft, ship, decoration etc.
Field has wide practical use.
At present, the main flow preparation method of aluminium foam sandwich plate be mull technique, powder metallurgy foaming method and.Mull technique is adopted to be had
Machine glue is by foamed aluminium and aluminum（Or aluminium alloy）Panel is bonded together, and obtains aluminium foam sandwich plate；Powder metallurgy foaming rule is
Pass through powder metallurgy route first（Mixed powder, pressure processing）, expandable precursor is obtained, then by expandable precursor and aluminum
（Or aluminium alloy）Panel carries out composite rolling, obtains aluminium foam sandwich plate finally by foamable.The weak point of mull technique
Be that panel is low with the bond strength of foam core, and 200 DEG C are usually no more than using temperature；Although powder metallurgy foaming method is obtained
Panel and the high intensity aluminium foam sandwich plate that foam core is metallurgical binding, but limited by powder metallurgy process itself, in product
Exist in cost, yield and size clearly disadvantageous.
For obtaining panel and foam core for the controllable high strength sandwich panel of metallurgical binding and surface layer thickness, this patent proposition
A kind of aluminium foam sandwich plate preparation method, obtains the expandable precursor for including foaming agent from melt approach, with reference to
TiH2Pretreatment, cladding the process such as aluminum or aluminum alloy plate and thermal insulation foaming, prepare between panel and foam core be metallurgical binding
The controllable aluminium foam sandwich plate of interface and surface thickness, overcomes powder metallurgy foaming method in goods cost, yield and size
Deficiency, overcome deficiency of the mull technique aluminium foam sandwich plate in plate-core bond strength.
The content of the invention
By aluminium alloy（Materials A）In the temperature melting insulations of T1, thickening, Jing pre-oxidation is added in the core aluminum alloy melt of thickening
The foaming agent TiH of process2It is stirred dispersion；Foaming mould is preheated to into T1 temperature, aluminum or aluminum alloy plate（Material B）It is preheated to
10 ~ 15 DEG C lower than its solidus temperature of T2 temperature；One block of preheated aluminum or aluminum alloy plate is encased inside into mold bottom, and will be contained
TiH2The core aluminum alloy melt of thickening pour in mould, subsequently in one piece of preheated aluminum or aluminum alloy of bath surface lid
Plate, finally covers mould upper cover plate；The temperature for controlling mould carries out thermal insulation foaming for T1, and in foaming process, core aluminum alloy melts
Body foaming becomes the foamed aluminum-core of sandwich plate, and panel melts and forms the solid object surface layer up and down of sandwich plate；Foaming process terminates
And after cooling down, obtaining surface layer and the aluminium foam sandwich plate that foamed aluminum-core is metallurgical binding, sandwich plate surface layer thickness passes through face
Plate thickness is controlled.Concrete steps include：
（1）Aluminium alloy melt melting and heat preservation：By aluminium alloy（Materials A）At temperature T1 higher than 20 ~ 30 DEG C of its liquidus temperature
After fusing, insulation obtains core aluminum alloy melt in 30 ~ 60 minutes；
（2）Aluminium alloy melt is viscosified：In step（1）Viscosifier metal Ca is added in the core aluminum alloy melt of acquisition, with 1000 ~
The mixing speed of 2000rpm is stirred 10 ~ 15 minutes, obtains the aluminium alloy melt of thickening；Wherein, the addition of Ca is molten for aluminium alloy
1 ~ 3%wt of weight；
（3）Add foaming agent：In step（2）The foaming agent of Jing pre-oxidation treatments is added in the aluminium alloy melt of the thickening for obtaining
TiH2, 40 ~ 100s is stirred with the mixing speed of 1000 ~ 3000rpm, expandable melt is obtained；
（4）Mould and aluminium sheet preheating：By the aluminum or aluminum alloy plate that thickness is 1 ~ 2mm（Material B）It is preheated to than its liquidus temperature
Temperature T2 that low 10 ~ 15 DEG C of T3, mould are preheated to temperature T1, and preheated aluminum or aluminum alloy plate is encased inside step below mould
（3）The expandable melt for obtaining pours mould into, in one layer of aluminum or aluminum alloy plate of bath surface lid and covers mould upper cover plate；
（5）Thermal insulation foaming：By step（4）The mould for including melt and aluminum or aluminum alloy plate for obtaining thermal insulation foaming at temperature T1
5 ~ 7 minutes, after foaming body air cooling, obtain aluminium foam sandwich plate.
Step of the present invention（1）Described in aluminium alloy be that binary that aluminum and Si, Cu, Mg, Zn, Mn element are constituted or polybasic aluminum are closed
Gold；Step（4）Described in aluminum or aluminum alloy plate be commercial pure Al sheet or all kinds of aluminium alloy plates.
Foaming agent TiH of the present invention2The particle size range of granule is 37 ~ 74 μm；Foaming agent TiH2Preprocess method for adopting
With 400 DEG C of 6h+（470~520）The technique of DEG C 1h carries out oxidation processes in atmospheric environment.
Temperature T1 of the present invention>T3>T2, T1-T2=10 ~ 20 DEG C.
The aluminium foam sandwich plate that the method for the invention is prepared, solid layer, core of the surface for 1.0 ~ 2.0mm of thickness
For 3 ~ 6mm of average pore size, the aluminium foam sandwich plate of porosity 75 ~ 90%.
Inventive principle：
1st, the matching principle of blowing temperature, preheating temperature and upper and lower aluminum or aluminum alloy plate liquidus temperature
Prepare aluminium foam sandwich plate and need to determine 3 key temperatures, blowing temperature T1, upper and lower aluminum or aluminum alloy plate preheating temperature T2,
Upper and lower aluminum or aluminum alloy plate liquidus temperature T3, triadic relation is T1>T3>T2, experimental studies results show there is following relation：
（1）Blowing temperature, core aluminum alloy melting and heat preservation temperature, mold preheating temperature are T1
（2）Upper and lower aluminum or aluminum alloy plate preheating temperature T2, T1-T2=10 ~ 20 DEG C
（3）Upper and lower aluminum or aluminum alloy plate liquidus temperature T3, T3-T2=10 ~ 15 DEG C
Mould is different from the preheating temperature of upper and lower aluminum or aluminum alloy plate, separately preheats, and T1>T2；Aluminum or aluminum alloy plate exists up and down
Preheating（Preheating temperature T2）When be solid-state, and foaming when be liquid（Blowing temperature T1）.
The starting point of Temperature Matching is core aluminum alloy (materials A）Liquidus temperature, thus release thermal insulation foaming temperature
T1, determines upper and lower aluminum or aluminum alloy plate according to T1（Material B）Preheating temperature and liquidus temperature T2, subsequently select aluminum and aluminium alloy
Plate（Material B）I.e.：The liquidus temperature of materials A → thermal insulation foaming temperature T1 →（Material B）Preheating temperature and liquidus temperature →
Determine material B.
2nd, the porosity control law of foamed aluminium
Relation between blowing temperature, foamed time and porosity is：
In formula,：The porosity of foamed aluminium board（%, 0<<100%）
t：Foamed time（min）
T 2 ：Blowing temperature（600~670℃）
3rd, the relation of foaming agent pretreatment and foam process
To foaming agent TiH2Surface oxidation treatment is carried out, oxide layer can be generated in its surface in situ, disperseed in high temperature aluminum melt
The low decomposition platform area of Shi Youyi sections（Ith areas of Fig. 2 Zhong）, the TiH within the period2Do not decompose or decompose on a small quantity, be conducive to foaming agent
It is dispersed, and which can be made to keep enough activity in foaming process（II, III area in Fig. 2）, obtain enough
Gas production is realizing effective foaming process.
The dispersed with stirring time（That is time period in Ith areas of Tu2Zhong）It is mutual between blowing temperature, foaming agent pretreating process
Relation is：
In formula, S：TiH2In the dispersed with stirring time of temperature（S,>0）
T 1 ：TiH2The maximum temperature of oxidation processes（470~520℃）
T 2 ：Blowing temperature（600~670℃）
Beneficial effects of the present invention：The expandable precursor for including foaming agent is obtained from melt approach, with reference to TiH2It is pre-
Process, coat the process such as aluminum or aluminum alloy plate and thermal insulation foaming, prepare between panel and foam core as metallurgical bonding interface and table
The controllable aluminium foam sandwich plate of face thickness, overcomes deficiency of the powder metallurgy foaming method in goods cost, yield and size, gram
Deficiency of the mull technique aluminium foam sandwich plate in plate-core bond strength is taken, technical process is simple, controllable, be capable of achieving industrialization
Production.
Description of the drawings
Fig. 1 is aluminium foam sandwich plate preparation technology flow chart；
Fig. 2 is oxidation pre-treatment TiH2In the Isothermal Decomposition curve synoptic diagram of blowing temperature.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, but protection scope of the present invention is simultaneously
It is not limited to the content.
Embodiment 1
（1）Alloy melting and heat preservation：AlSi12 alloys are melted in 600 DEG C, 30 minutes are incubated；
（2）Thickening：To step（1）Add in the AlSi12 alloy melts of acquisition and with AlSi12 alloy melt mass percents be
The Ca of 1.5%wt, is stirred 15 minutes with the mixing speed of 1000rpm, obtains the AlSi12 alloy melts of thickening；
（3）Add foaming agent：To step（2）Add and AlSi12 alloy melt quality in the thickening AlSi12 alloy melts of acquisition
Foaming agent TiH of the percentage ratio for 400 DEG C of 6h+470 DEG C of 1h pre-oxidation treatments of 1.0%wt, Jing2, foaming agent TiH2The granularity model of granule
Enclose for 37 ~ 74 μm, it is 70s that the mixing speed of foaming agent dispersed with stirring is 3000rpm, mixing time, obtains foamable melt；
（4）Mould and aluminium sheet preheating：AlSi9 alloy sheets of the thickness for 1mm are preheated to into 590 DEG C, mould is preheated to 600 DEG C, mould
Tool lower section be encased inside preheated AlSi9 alloy sheets, by step 3 obtain containing TiH2Thickening aluminium alloy melt pour mould into,
One layer of AlSi9 alloy sheets of bath surface lid simultaneously cover mould upper cover plate；
（5）Thermal insulation foaming：Mold temperature of the step 4 containing melt and AlSi9 alloy sheets is maintained at into 7 points of 600 DEG C of thermal insulation foamings
Clock, it is average pore size 3mm, porosity 75% to obtain surface after foaming body air cooling for the solid AlSi9 alloy-layers of thickness 1mm, core
AlSi12 alloy foam sandwich plates.
Embodiment 2
（1）Aluminium alloy melt melting and heat preservation：ZL111 alloys are melted in 620 DEG C, 50 minutes are incubated；
（2）Thickening：To step（1）In the ZL111 alloy melts of acquisition, addition is 2%wt with ZL111 alloy melts mass percent
Ca, stirred 12 minutes with the mixing speed of 1500rpm, obtain the ZL111 alloy melts of thickening；
（3）Add foaming agent：To step（2）Add and ZL111 alloy melts quality hundred in the thickening ZL111 alloy melts of acquisition
Divide than the foaming agent TiH for 400 DEG C of 6h+490 DEG C of 1h pre-oxidation treatments of 1.5%wt, Jing2, foaming agent TiH2The particle size range of granule
For 37 ~ 74 μm, the mixing speed of foaming agent dispersed with stirring is 2000rpm, and mixing time is 40s, obtains foamable aluminium alloy
Melt is stand-by；
（4）Mould and aluminium sheet preheating：AlSi7 alloy sheets of the thickness for 1mm are preheated to into 600 DEG C, mould is preheated to 620 DEG C, mould
Tool lower section is encased inside preheated AlSi7 alloy sheets, by step（3）Obtain containing TiH2Thickening aluminium alloy melt pour mould into,
In one layer of AlSi7 alloy sheets of bath surface lid and cover mould upper cover plate；
（5）Thermal insulation foaming：By step（4）The mold temperature containing melt and AlSi7 alloy sheets for obtaining is maintained at 620 DEG C to be carried out
Thermal insulation foaming 6 minutes, it is average pore size to obtain surface after foaming body air cooling for the solid AlSi7 alloy-layers of thickness 1m, core
The ZL111 alloy foam sandwich plates of 4mm, porosity 80%.
Embodiment 3
（1）Aluminium alloy melt melting and heat preservation：7075 alloys are melted in 670 DEG C, 50 minutes are incubated；
（2）Thickening：To step（1）In 7075 alloy melts for obtaining, addition is 3%wt's with 7075 alloy melt mass percents
Ca, is stirred 12 minutes with the mixing speed of 1800rpm, obtains 7075 alloy melts of thickening；
（3）Add foaming agent：To step（2）Add and 7075 alloy melt quality percentages in 7075 alloy melt of thickening of acquisition
Than the foaming agent TiH for 400 DEG C of 6h+520 DEG C of 1h pre-oxidation treatments of 2%wt, Jing2, foaming agent TiH2The particle size range of granule be 37 ~
74 μm, the mixing speed of foaming agent dispersed with stirring is 1000rpm, and mixing time is 100s, obtains foamable aluminium alloy melt
It is stand-by；
（4）Mould and aluminium sheet preheating：Pure aluminum plate of the thickness for 2mm is preheated to into 650 DEG C, mould is preheated to 670 DEG C, below mould
Preheated pure aluminum plate is encased inside, by step（3）Obtain containing TiH2Thickening aluminium alloy melt pour mould into, in bath surface lid
One layer of pure aluminum plate simultaneously covers mould upper cover plate；
（5）Thermal insulation foaming：By step（4）The mold temperature containing melt and pure aluminum plate for obtaining is maintained at 670 DEG C and is incubated
Foaming 5 minutes, it is average pore size 5mm, porosity to obtain surface after foaming body air cooling for the solid aluminum layer of thickness 2mm, core
85% 7075 alloy foam sandwich plates.
Embodiment 4
（1）Aluminium alloy melt melting and heat preservation：AlMg10 alloys are melted at 640 DEG C, 60 minutes are incubated；
（2）Aluminium alloy melt is viscosified：To step（1）Addition and AlMg10 alloy melt quality in the AlMg10 alloy melts of acquisition
Ca of the percentage ratio for 2.0%wt, is stirred 10 minutes with the mixing speed of 2000rpm, obtains the AlMg10 alloy melts of thickening；
（3）Add foaming agent：To step（2）Add and AlMg10 alloy melt quality in the thickening AlMg10 alloy melts of acquisition
Foaming agent TiH of the percentage ratio for 400 DEG C of 6h+510 DEG C of 1h pre-oxidation treatments of 1.7%wt, Jing2, the stirring speed of foaming agent dispersed with stirring
Spend for 2000rpm, mixing time is 45s；
（4）Mould and aluminium sheet preheating：AlSi4 alloy sheets of the thickness for 1.5mm are preheated to into 620 DEG C, mould is preheated to 640 DEG C,
Preheated AlSi4 alloy sheets are encased inside below mould, by step（3）Obtain containing TiH2Thickening aluminium alloy melt pour mould into
Tool, in one layer of AlSi4 alloy sheets of bath surface lid and covers mould upper cover plate；
（5）Thermal insulation foaming：By step（4）The mold temperature containing melt and AlSi4 alloy sheets for obtaining is maintained at 640 DEG C to be carried out
Thermal insulation foaming 7 minutes, it is average pore size to obtain surface after foaming body air cooling for the solid AlSi4 alloy-layers of thickness 1.5mm, core
The AlMg10 alloy foam sandwich plates of 6mm, porosity 90%.
Claims (4)
1. a kind of preparation method of aluminium foam sandwich plate, it is characterised in that specifically include following steps：
（1）Aluminium alloy melt melting and heat preservation：Protect after aluminium alloy is melted at temperature T1 higher than 20 ~ 30 DEG C of its liquidus temperature
Temperature obtains core aluminum alloy melt in 30 ~ 60 minutes；
（2）Aluminium alloy melt is viscosified：In step（1）Viscosifier metal Ca is added in the core aluminum alloy melt of acquisition, with 1000 ~
The mixing speed of 2000rpm is stirred 10 ~ 15 minutes, obtains the aluminium alloy melt of thickening；Wherein, the addition of Ca is molten for aluminium alloy
1 ~ 3%wt of weight；
（3）Add foaming agent：In step（2）The foaming agent of Jing pre-oxidation treatments is added in the aluminium alloy melt of the thickening for obtaining
TiH2, 40 ~ 100s is stirred with the mixing speed of 1000 ~ 3000rpm, expandable melt is obtained；
（4）Mould and aluminium sheet preheating：By thickness for 1 ~ 2mm aluminum or aluminum alloy plate be preheated to it is lower by 10 than its liquidus temperature T3 ~
15 DEG C of temperature T2, mould are preheated to temperature T1, and preheated aluminum or aluminum alloy plate is encased inside step below mould（3）Obtain
Expandable melt pours mould into, in one layer of aluminum or aluminum alloy plate of bath surface lid and covers mould upper cover plate；
（5）Thermal insulation foaming：By step（4）The mould for including melt and aluminum or aluminum alloy plate for obtaining thermal insulation foaming at temperature T1
5 ~ 7 minutes, after foaming body air cooling, obtain aluminium foam sandwich plate.
2. the preparation method of aluminium foam sandwich plate according to claim 1, it is characterised in that：Step（1）Described in aluminium alloy
The binary constituted with Si, Cu, Mg, Zn, Mn element for aluminum or polynary aluminium alloy；Step（4）Described in aluminum or aluminum alloy plate be work
Industry pure aluminum plate or all kinds of aluminium alloy plates.
3. the preparation method of aluminium foam sandwich plate according to claim 1, it is characterised in that：Foaming agent TiH2The granularity of granule
Scope is 37 ~ 74 μm；Foaming agent TiH2Preprocess method be using 400 DEG C of 6h+（470~520）The technique of DEG C 1h is in big compression ring
Oxidation processes are carried out in border.
4. the preparation method of aluminium foam sandwich plate according to claim 1, it is characterised in that：T1>T3>T2, T1-T2=10 ~ 20
℃。
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