CN1373233A - Method for making porous Al sintered material - Google Patents
Method for making porous Al sintered material Download PDFInfo
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- CN1373233A CN1373233A CN 01108978 CN01108978A CN1373233A CN 1373233 A CN1373233 A CN 1373233A CN 01108978 CN01108978 CN 01108978 CN 01108978 A CN01108978 A CN 01108978A CN 1373233 A CN1373233 A CN 1373233A
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Abstract
A sintered porous Al material is prepared from the Al or al-alloy powder as basic powder, the Al-alloy powder which has a melting point lower than that of basic powder and can generate liquid phase, and/or one or more alloy powder or metal powder which has a melting point lower than that of basic powder and can generate eutectic reaction when it is fused along with basic powder through mixing, charging in mould, and sintering in non-oxidizing or reducing atmosphere under (0.9-20)X10 to the power -3 kgf/sq.cm of pressure.
Description
Invention field
The present invention relates to a kind of manufacture method of porous matter aluminum sinter material.Relate in particular to noise, noise are had fabulous sound absorption characteristics, the manufacture method of dimensional precision height, porous matter Al agglomerated material that production performance is good simultaneously.
Prior art
The porous sintered material of porous Al class agglomerated material and copper or iron compares, owing to have the following advantages:
(1) light specific gravity;
(2) have good extensibility, carry out bending machining with comparalive ease;
(3) sintering temperature low, can make less expensively.
Therefore, this material research and development have energetically been carried out.But, described in the public clear 43-20884 of initial stage of development such as spy number, 45-54206 number, 45-24007 number, 47-32163 number each communique, mainly be in order to develop oil bearing high in the mechanical part, to obtain high-intensity cupric agglomerated material well, again easily as sintering composition sintering character so be mostly exploitation to the requirement of strength of porous sintered material.
Do not disclose in having pressurization, nonoxidizing atmosphere in the special public clear 56-11373 communique and carried out sintering, thereby obtained the porous Al class agglomerated material method of porosity rate 40～50%.Although be widely used in aspects such as sound-absorbing material, filtering material, when under no pressurized conditions, carrying out sintering, because the free shrink that sintering shrinks caused horizontal direction vertical direction sintered compact, so be difficult to its size of control and porosity rate.
In addition, in the manufacture method of the porous sintered body of special public clear 61-48566 number disclosed relevant Al etc., though exert pressure when having put down in writing sintering, the Al powder of basic powder is exerted pressure make its distortion in the method, with the purpose of the oxide film that reaches failure surface.Point out that must apply mean pressure to per 1 basic powder particle is 60g/cm in giving an example
2More than (if the face of pressing press to convert; Porosity rate=40% o'clock, its face are pressed and are about 36g/cm
2=3.6 * 10
-2Kgf/cm
2).Obviously these are different with the scope of exerting pressure with purpose of the present invention.
The problem points that invention will solve
The present invention is a purpose to solve described problem, and purpose is to provide a kind of Al class agglomerated material specifically, and not only dimensional precision is good, its porosity rate is controlled at optimum range to obtain best sound absorbing coefficient and intensity simultaneously for it.
Description of drawings
Fig. 1 is a kind of embodiment of porous Al agglomerated material manufacturing process of the present invention;
Fig. 2 is the explanatory view that shows the sintering process of prior art and sintering method of the present invention;
Fig. 3 is the thickness distribution comparison diagram of existing Al class sintering method and the resulting Al class agglomerated material of Al class sintering method of the present invention difference.
Detailed Description Of The Invention
The invention provides the manufacture method of the porous sintered material of a kind of Al or Al alloyed powder, the method is take the alloyed powder of Al or Al as basic powder, itself and fusing point than described basic powder is low, can produce again the Al alloyed powder of liquid phase, or use lower than the melting temperature of basic powder, can mix with one kind or two or more metal powder or the alloyed powder that basic powder produces eutectic reaction when the melting again simultaneously, then the powder that mixes is put in the mould of the shape that requires, in nonoxidizing atmosphere or reducing atmosphere, carry out sintering, before arriving desired thickness, apply 0.9 * 10-3kgf/cm
2～20×10
-3kgf/cm
2Pressure, and work as When the caused contraction of sintering arrived the thickness of material requested, sintered body forms except outer part did not have pressurization State.
According to the present invention, aluminium powder comprises spray form powder (irregularly shaped powder, spherical powder), crushing powder etc., and these may be used to sintered porous material.The present invention can adopt aluminium powder form and the Al alloy powder that is usually used in agglomerated material, as is disclosed in the spy and opens aluminium powder form and Al alloy powder material among the clear 61-174353.
According to the present invention, described fusing point than basic powder is low, can and the basic powder metal that when fusion, produces eutectic reaction be preferably selected from copper, silicon, manganese, magnesium or its mixture.Described fusing point than basic powder is low, can and the basic powder alloy that when fusion, produces eutectic reaction be the mixture of one or more Al alloy powder.Be preferably Al alloy powder.
The granularity of aluminium powder is 50 μ m～1500 μ m, is preferably 100 μ m-1200 μ m, more preferably 200 μ m-1000 μ m.Size-grade distribution is selected top condition according to purposes, and general fine powder is many more, can obtain the high porous material of density more, and on the contrary, granularity is thick more to obtain low density porous material more.
According to the present invention, the granularity of Al alloy powder also can be above-mentioned scope.The granularity of preferred Al alloy powder is 1/5～1/20 of an aluminum powder particle size.
Can be ratio commonly used in the aluminum sinter material field as the ratio of the aluminium powder of basic powder or Al alloy powder and other metal or alloy powder.For example, the 5-100 that is other metal or alloy grain weight amount as the Al powder or the Al alloy powder of basic powder doubly, 5-25 doubly or 5-20 doubly.For example, the content of Si is 1%, 2% or 5% (Al-1%Si in the mix powder of Al and Si; Al-2%Si; Al-5%Si).Basic powder and other powder should mix.The powder mix of aluminium powder form and powdered alloy can be added by various feeding devices, supplies with in the crystal vessel as loading hopper utilization deadweight.
Sintering temperature should be less than the fusing point of aluminium.Its actual temp is also complied with the metal that adopted and aluminium alloy and is decided.Sintering temperature be controlled at Al alloy powder produce solid-liquid phase temperature, again be in the centre of aluminium powder form fusing point, near near the fusing point.Whole technology is heating curve slowly, and alloying constituent is evenly spread.As 600-660 ℃, 620-655 ℃, more preferably 640-655 ℃.Preferred sintering temperature and time can be adopted temperature commonly used in the aluminum sinter material, carry out as carrying out scope by sintering temperature as shown in the public clear 60-47322 of spy and time.
The optimum range that applies the face pressure for the raising dimensional precision is 0.9 * 10
-3Kgf/cm
2～20 * 10
-3Kgf/cm
2, be preferably 1.1 * 10
-3Kgf/cm
2～18 * 10
-3Kgf/cm
2Exerting pressure when sintering is discontented with 0.9 * 10
-3Kgf/cm
3The time, can't obtain uniform thickness of slab and porosity rate, also can't suppress the contraction of horizontal direction.On the contrary, surpass 20 * 10 if exert pressure
-3Kgf/cm
3The time, will make sintering excessive, thus the sound absorbing capabilities of influence.Therefore, the optimum range of exerting pressure is 1.2 * 10
-3Kgf/cm
3～16 * 10
-3Kgf/cm
3
After sintering finished, crystal vessel carried out the cooling zone and cools off.
Below, the present invention is described in detail in conjunction with the accompanying drawings.
Fig. 1 is a kind of embodiment of making the manufacturing process of porous Al agglomerated material of the present invention
In Fig. 1, with Al be the raw material powder 1 of main component pack into by loading hopper 2 and the not aitiogenic container 3 of Al (for example, graphite charcoal container) in, its thickness of packing into surpasses the degree of depth of its container, promptly leaves raw material powder 1 on the edge of this container too.Cover thereon then and the not aitiogenic lid 4 of Al (for example, the graphite carbon slab), put into and have rare gas element (N
2, Ar, He etc.) or reducing gas (H
2) sintering zone 5 in carry out sintering, by cooling zone 6 cooling, from container 3, take out then, obtain porous Al class agglomerated material 7.
In Fig. 2, the 8th, the raw material powder before the sintering under the no pressurized conditions, the 9th, resulting sintered compact under no pressurized conditions, contraction heterogeneity big, vertical process that its horizontal direction is shunk.The 7th, of the present invention under pressurized conditions resulting sintered compact, comparing with the former, to shrink contraction little, vertical direction also relative even for horizontal direction.Below describe its reason in detail.
When raw material powder 1 when loading hopper 2 is encased in container 3, its density is about 1.0g/cm
3, and the density when to obtain sound absorbing coefficient and intensity be the ideal sound absorption material of top condition is 1.5g/cm
3, the volumetric shrinkage that taken place during its sintering is about 33%.In the sintering process, owing to main the contraction that mutual fusion produces vertical direction between the powder takes place during heating, thereby formed the sintered compact of one because the contraction that thermal contraction produces horizontal direction takes place when cooling.
When this process is when carrying out under no pressurized conditions, because the temperature head in the stove and the thermal conduction heterogeneity of each several part, bigger deviation takes place in the thickness of vertical direction material, sintering situation.During cooling since to sintered compact without any constraint, freely carry out thermal contraction, be impossible so control its geomery.
And in sintering process of the present invention, after raw material powder 1 is being packed container 3 into, close the lid 4, because the deadweight of lid makes it produce pressure, this stage raw material powder 1 is to keep combination closely with lid.From sintering oven 5 the hot mobile alignment of raw material powder 1 is investigated and can be found, the thermal source of stove sends heat to container cover by radiation, convection current, sends to equably with it by container cover then to keep the tight powder that links to each other.And because the pressure that the lid deadweight produces, the volumetric shrinkage of sintered compact keeps homogeneous in the time of making heating.
In addition,, also left the thermal conduction that sends by lid simultaneously, made the sintering process stagnate hastily in case when the powder in the container of packing into was lower than the container edge height, because volumetric shrinkage, sintered compact broke away from the pressure of its lid.Therefore can control the contraction of sintered compact by the degree of depth of setting container, the height of container edge powder, to obtain the uniform sintered compact of density.
Fig. 3 is presented at sintering obtains under the no pressurized conditions sintered compact and distributes with the material thickness of its vertical-every 50mm of transverse direction of sintered compact of the resulting about 500mm * 500mm of the sintering that carries out under the state of exerting pressure of the present invention * thick 100mm.Under the no pressurized conditions, the material thickness deviation of sintered compact is very big, and when its central part of setting was 0, its periphery was+10mm; And the material thickness deviation of resulting sintered compact is improved widely under the condition of pressurization, deviate only is 2mm.Simultaneously, the apparent density of central part and periphery is compared, the density of its central part of sintered compact under the no pressurized conditions is 1.7g/cm
3, periphery density be 1.5g/cm
3, and under the pressurized conditions density of resulting sintered compact even, the density of central part and periphery is respectively 1.51 and 1.5g/cm
3
The sintered compact that becomes one during cooling makes its container edge obtain constraint on every side owing to cover the pressure of deadweight when thermal contraction, thereby has prevented because the caused abnormal distortion of thermal contraction.
The present invention will be described with embodiment below, but anything but scope of the present invention is limited.Except as otherwise noted, various ratios are weight ratio.
Embodiment 1
The mixed powder of filling thickness 7mm aluminium powder and silicon in the crystal vessel of long by 500 * wide by 500 * dark 5.2mm.650 ℃ of following sintering of sintering temperature 10 minutes.Described aluminium powder is the spray form aluminium powder, and purity is more than 99%, and impurity is below 1%, and the powder diameter is the center with 500 μ m.The ratio of aluminium powder and silicon is: Al-1%Si.
Surface pressure is 0.9 * 10
-3Kgf/cm
2Under shrinking percentage be 2.7%, and face is pressed when be worth less than this, shrinks increase sharp, is difficult to keep the size quality of sintered compact.It is 20 * 10 that face is pressed
-3Kgf/cm
2Be punctured into 0.6% down.When surface pressure surpasses 20 * 10
-3Kgf/cm
2The time, the shrinking percentage of product does not have great variation.
The mixed powder of filling thickness 7mm aluminium powder and copper powder in the crystal vessel of long by 500 * wide by 500 * dark 5.2mm was 630 ℃ of following sintering of sintering temperature 10 minutes.Described aluminium powder form is crushing shape aluminium powder, and purity is more than 99%, and impurity is below 1%, and the powder diameter is the center with 100 μ m; Copper powder uses electrolytic copper, below the copper powder diameter 100 μ m.Aluminium powder and copper powder ratio are: Al-4%Cu.
Surface pressure is 0.9 * 10
-3Kgf/cm
2Under shrinking percentage be 3%, and face is pressed when be worth less than this, shrinks increase sharp, is difficult to keep the size quality of sintered compact.It is 20 * 10 that face is pressed
-3Kgf/cm
2Be punctured into 0.7% down.When surface pressure surpasses 20 * 10
-3Kgf/cm
2The time, the shrinking percentage of product does not have great variation.
Utilize other powder as Al-1%Ni; Al-1%Ni-1%Cu obtains similar result.
The invention effect
In sum, the manufacture method of Porous Al agglomerated material of the present invention has solved existing already present Problem, the contraction deviation of horizontal or vertical direction obtains homogenization when making sintering, thus so that sound absorption is special The thickness of slab of property, material is controlled, is a kind of productive exceedingly useful sintering side of sintered body of improving Method.
Fig. 1 symbol description
1 ... material powder 2 ... loading hopper
3 ... container 4 ... lid
5 ... sintering zone 6 ... the cooling zone
7 ... porous Al class agglomerated material 8 ... raw material powder under the no pressurized conditions before the sintering
9 ... sintered compact under the no pressurization situation
Claims (6)
1. the manufacture method of the porous sintered material of Al or Al alloy powder comprises the following steps:
(1) Al or Al alloy powder basic powder and fusing point than basic powder is low, can produce the Al alloy powder of liquid phase again, perhaps low with fusing point than basic powder, can and the basic powder metal or alloy powder that when fusion, produces eutectic reaction mix;
(2) powder of above-mentioned gained is put in the mould of the shape that requires, in non-oxide or reducing atmosphere, carried out sintering, before arriving institute's required thickness, apply 0.9 * 10
-3Kgf/cm
2～20 * 10
-3Kgf/cm
2Pressure, and when because the caused contraction of sintering when arriving the thickness of material requested, sintered compact forms no pressurized state except that periphery.
2. the process of claim 1 wherein described fusing point than basic powder low, can and the basic powder metal that when fusion, produces eutectic reaction be selected from copper, silicon, manganese, magnesium or its mixture.
3. the process of claim 1 wherein described fusing point than basic powder low, can and the basic powder alloy that when fusion, produces eutectic reaction be the mixture of one or more Al alloy powder to be preferably Al alloy powder.
4. the process of claim 1 wherein that 5-20 that Al powder or Al alloy powder as basic powder be other metal or alloy grain weight amount doubly.
5. the process of claim 1 wherein that institute's applied pressure is 1.1 * 10 before arriving desired thickness
-3Kgf/cm
2～18 * 10
-3Kgf/cm
2
6. the Al for preparing according to each method of claim 1-5 or the porous sintered material of Al alloy powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108978 CN1373233A (en) | 2001-02-28 | 2001-02-28 | Method for making porous Al sintered material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108978 CN1373233A (en) | 2001-02-28 | 2001-02-28 | Method for making porous Al sintered material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1373233A true CN1373233A (en) | 2002-10-09 |
Family
ID=4657629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01108978 Pending CN1373233A (en) | 2001-02-28 | 2001-02-28 | Method for making porous Al sintered material |
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|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104630525A (en) * | 2015-01-29 | 2015-05-20 | 华南理工大学 | Porous NiTiNb superelastic alloy with low strain hysteresis and preparation method of alloy |
| CN106102966A (en) * | 2014-05-16 | 2016-11-09 | 三菱综合材料株式会社 | Porous aluminum sintered body and the manufacture method of porous aluminum sintered body |
| CN106132598A (en) * | 2014-05-16 | 2016-11-16 | 三菱综合材料株式会社 | Porous aluminum sintered body and the manufacture method of porous aluminum sintered body |
| CN107107196A (en) * | 2014-10-30 | 2017-08-29 | 三菱综合材料株式会社 | The manufacture method of porous aluminum sintered body and porous aluminum sintered body |
| CN112359238A (en) * | 2020-11-05 | 2021-02-12 | 佛山市飞成金属制品有限公司 | Porous aluminum alloy preparation process and aluminum alloy super-heat-conduction plate |
| US10981230B2 (en) | 2014-05-30 | 2021-04-20 | Mitsubishi Materials Corporation | Porous aluminum complex and method of producing porous aluminum complex |
-
2001
- 2001-02-28 CN CN 01108978 patent/CN1373233A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102966A (en) * | 2014-05-16 | 2016-11-09 | 三菱综合材料株式会社 | Porous aluminum sintered body and the manufacture method of porous aluminum sintered body |
| CN106132598A (en) * | 2014-05-16 | 2016-11-16 | 三菱综合材料株式会社 | Porous aluminum sintered body and the manufacture method of porous aluminum sintered body |
| CN106102966B (en) * | 2014-05-16 | 2019-04-05 | 三菱综合材料株式会社 | The manufacturing method of porous aluminum sintered body and porous aluminum sintered body |
| CN106132598B (en) * | 2014-05-16 | 2019-04-19 | 三菱综合材料株式会社 | The manufacturing method of porous aluminum sintered body and porous aluminum sintered body |
| US10478895B2 (en) | 2014-05-16 | 2019-11-19 | Mitsubishi Materials Corporation | Porous aluminum sintered compact and method of producing porous aluminum sintered compact |
| US10981228B2 (en) | 2014-05-16 | 2021-04-20 | Mitsubishi Materials Corporation | Porous aluminum sintered compact and method of producing porous aluminum sintered compact |
| US10981230B2 (en) | 2014-05-30 | 2021-04-20 | Mitsubishi Materials Corporation | Porous aluminum complex and method of producing porous aluminum complex |
| CN107107196A (en) * | 2014-10-30 | 2017-08-29 | 三菱综合材料株式会社 | The manufacture method of porous aluminum sintered body and porous aluminum sintered body |
| US10543531B2 (en) | 2014-10-30 | 2020-01-28 | Mitsubishi Materials Corporation | Porous aluminum sintered material and method of producing porous aluminum sintered material |
| CN104630525A (en) * | 2015-01-29 | 2015-05-20 | 华南理工大学 | Porous NiTiNb superelastic alloy with low strain hysteresis and preparation method of alloy |
| CN112359238A (en) * | 2020-11-05 | 2021-02-12 | 佛山市飞成金属制品有限公司 | Porous aluminum alloy preparation process and aluminum alloy super-heat-conduction plate |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |