CN1232665C - High porosity through hole multi-porous aluminum alloy, preparation method and special apparatus thereof - Google Patents
High porosity through hole multi-porous aluminum alloy, preparation method and special apparatus thereof Download PDFInfo
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- CN1232665C CN1232665C CN 200410013955 CN200410013955A CN1232665C CN 1232665 C CN1232665 C CN 1232665C CN 200410013955 CN200410013955 CN 200410013955 CN 200410013955 A CN200410013955 A CN 200410013955A CN 1232665 C CN1232665 C CN 1232665C
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Abstract
The present invention discloses a preparation method of a through hole multiporous aluminum alloy with high porosity. Firstly, an aluminium alloy is heated to the melting point, the temperature of the aluminium alloy melt is kept between 660 and 750 DEG C, and filler particles are loaded into a mold, and insulated at a temperature of 500 to 660 DEG C until the temperature of the filler particles are uniform. The rest accounts for 5 to 20% of the theoretical casting amount of the aluminium alloy, the mold is placed on the base of a sucking disk on a negative-pressure apparatus, the insulated aluminium alloy melt is cast in the mold, the mold is communicated with the negative-pressure apparatus with the pressure of -40 to -2 KPa, and a composite body of the filler particles and the aluminium alloy is taken out and the filler particles are removed after the aluminium alloy is solidified. The present invention also discloses a through hole multiporous aluminum alloy with high porosity, and the porosity of the multiporous aluminum alloy is 70 to 95%. In addition, the present invention discloses an apparatus for preparing the through hole multiporous aluminum alloy with high porosity. The multiporous aluminum alloy with the porosity of 70 to 95%, which is obtained by the method, has a through hole degree of 20 to 35%.
Description
One. technical field
The present invention relates to the metal material processing field, relate in particular to a kind of method and device of making through-hole porous aluminium alloy with high porosity.
Two. background technology
Preparing in the porous Al alloy process with the negative pressure THROUGH METHOD, owing to be subjected to the restriction of filler grain accumulation body volume fraction (45%～60%), consider that aluminium alloy melt shrinks the porosity (Pr＜5%) that produces to the additional porosity (Pr＜5%) and the aluminum alloy solidification of the nonwetting generation of filler grain, the porosity of gained porous Al alloy is 55%～70%.Up to the present the reliable method that does not also have the porous Al alloy of a kind of preparation high porosity (70%～95%).
Three. summary of the invention
Technical problem the invention provides a kind of method and device of making through-hole porous aluminium alloy with high porosity.
A kind of method of making through-hole porous aluminium alloy with high porosity of technical scheme, comprise the steps: the first step, take by weighing the aluminium alloy of certain mass, this quality is actual aluminium alloy casting quality, be heated to thawing, keeping the aluminium alloy melt temperature is 660 ℃～750 ℃, filler grain is packed in the mould 1, under 500 ℃～660 ℃, be incubated even to the filler grain temperature, wherein: actual aluminium alloy casting quality=theoretical aluminium alloy casting quality+surplus, theoretical aluminium alloy casting quality=filler grain accumulation body height * filler grain accumulation body cross-sectional area * aluminium alloy density * (1-porous Al alloy porosity), 5%～20% of the reasonable opinion of surplus aluminium alloy casting amount, second step, mould 1 is placed on the sucker base 2 of negative pressure device 3, aluminium alloy melt 4 after will being incubated again is cast in the mould 1, and with mould 1 be communicated in pressure for-2KPa～-negative pressure device 3 of 40KPa, aluminium alloy melt infiltrates in the filler grain, and some aluminium alloy melt flows through upper plate 6, rest between upper plate 6 and the lower shoe 7, the 3rd step, after treating aluminum alloy solidification, take out the complex body of filler grain and aluminium alloy, remove filler grain, obtaining porosity is 70%～95%, void shape is polygon or sphere, hole is evenly distributed, and mean pore size is 0.5～7mm, the through hole degree is 20%～35% through-hole porous aluminium alloy with high porosity.
A kind of isolated plant that is used to make through-hole porous aluminium alloy with high porosity, comprise negative pressure system and mould, one end of mould is connected in negative pressure system, be placed with upper plate and lower shoe in the mould, wherein, upper plate is that the grid length of side is the wire netting of 2～6mm, and lower shoe is that the aperture is 2～6mm and the orifice plate that posts 100～200 order wire nettings.
Technique effect (1) the present invention is by temperature, the temperature of filler grain and the seepage velocity that the seepage flow negative pressure is controlled aluminium alloy melt of control aluminium alloy melt, make aluminium alloy melt flow through filler grain, but make the gap of filler grain be filled deficiently equably by aluminium alloy melt with certain seepage velocity.Because the gap of filler grain is not filled fully, but fill uniformly, thereby make the porous Al alloy that obtains have higher porosity.(2) the preparation porosity is 70%-95% (for example 70%, 75%, 78%, 80%, 85%, 90%, 95%) in the porous Al alloy process, if aluminium alloy casting amount very little, aluminium liquid can be selected more excellent percolation path in flow event, the gap of filler grain will can not filled equably, thereby will obtain the uneven porous Al alloy of skeleton; Applying certain surplus can effectively increase the homogeneity of porous Al alloy, to obtain through hole degree height, the uniform porous Al alloy of skeleton; Surplus is the flow through molds upper plate, finally solidifies and rests between upper plate and the lower shoe.Different porositys requires different surpluses.The present invention is according to the requirement of porous Al alloy different porosities, pre-estimates surplus and calculates the quality of required aluminium alloy, obtains the uniform porous Al alloy of skeleton.(3) usually the Circularhole diameter that is interconnected between adjacent two holes in the porous Al alloy is called the through-hole diameter of porous Al alloy, note is made L, and the degree that is interconnected between the adjacent holes in the porous Al alloy is called the through hole degree of porous Al alloy, and note is made ω, that is:
The through hole degree of 70%～95% the porous Al alloy that the present invention obtains reaches 20%～35%.(4) through-hole porous aluminium alloy with high porosity has good sound absorbing capabilities, and porosity is that 70%～95% porous Al alloy can be used as the sound-absorbing material in some specific acoustic wave range of frequency.(5) porous Al alloy can be regarded a kind of Special Circumstances of alloy matrix aluminum and air two-phase coexistent as, and air reaches the inhomogeneous and stress-strain of aluminum alloy framework two-phase mutually, and to have phase differential be the physical cause that produces high damping.Damping characteristic is relevant with the pore structure parameter of porous Al alloy, improves porosity, reduces the in-fighting value that the aperture will increase porous Al alloy.So being 70%～95% porous Al alloy, porosity has excellent damping shock absorption performance.(6) porous aluminum has the particular structure feature.On the one hand, the capacity of heat transmission of hole internal gas is relatively poor, and the repeated reflection by cell wall absorbs and reduced radiation, thereby has less thermal conductivity, and under the natural convection condition, porous aluminum has good heat-proof quality, and increases with the increase of porosity.Simultaneously, through-hole porous aluminium alloy is under the forced convection situation, because the gas intensive convection current in the inner hole shows good heat dissipation characteristics, its heat dissipation characteristics increases with the increase of porosity.Can be used as lagging material under the natural convection condition so porosity is 70%～95% porous Al alloy, and be used as thermal component under the forced convection condition, they have stronger heat insulation and heat dispersion than the porous Al alloy than low porosity; (7) hole of porous Al alloy is interconnected, and is three-dimensional netted skeletal distribution, has penetrating quality preferably.Concrete fluid breathability can be relevant with porosity, aperture and fluidic viscosity, flow velocity etc.Transmission coefficient α depends on the structural performance of porous Al alloy, increases with the increase of aperture and porosity.The porous Al alloy of porosity 70%～95% provided by the invention is the good material of filtration and fluid control, can also be as support of the catalyst.(8) the present invention adopt the effect of upper plate be allow the casting the aluminium alloy surplus pass through, thereby make that the porosity of porous Al alloy is even.(9) lower shoe of the present invention adopts and posts the orifice plate that big order is counted wire netting, avoids aluminium alloy liquid to flow in the negative pressure device, does not influence the effect of negative pressure simultaneously.
Four. description of drawings
Fig. 1 is negative pressure seepage apparatus figure of the present invention
Fig. 2 is a die structure dwg of the present invention
Fig. 3 is a upper plate synoptic diagram of the present invention
Fig. 4 is a lower shoe synoptic diagram of the present invention
Fig. 5 is pore diameter range 4.75-5.5mm, the porous Al alloy of porosity 64.2%
Fig. 6 is the pore diameter range 2.25-3.5mm that the present invention obtains, the porous Al alloy of porosity 74.8%
Fig. 7 is the pore diameter range 4.75-5.5mm that the present invention obtains, the porous Al alloy of porosity 84.7%
Fig. 8 is the pore diameter range 5.5-6.8mm that the present invention obtains, the porous Al alloy of porosity 90.4%
Five. specific embodiments
1 one kinds of methods of making through-hole porous aluminium alloy with high porosity of embodiment, comprise the steps: the first step, take by weighing the aluminium alloy (aluminium alloy can be siliceous 6%～11% aluminum silicon alloy or the aluminum-copper alloy of cupric 4～10%) of certain mass, this quality is actual aluminium alloy casting quality, be heated to thawing, keeping the aluminium alloy melt temperature is 660 ℃～750 ℃, temperature is chosen as 660 ℃, 680 ℃, 700 ℃, 750 ℃, filler grain is packed in the mould 1, under 500 ℃～660 ℃, be incubated even to the filler grain temperature, temperature can be taken as 500 ℃, 550 ℃, 600 ℃, 620 ℃, 640 ℃, 660 ℃, wherein: actual aluminium alloy casting quality=theoretical aluminium alloy casting quality+surplus, theoretical aluminium alloy casting quality=filler grain accumulation body height * filler grain accumulation body cross-sectional area * aluminium alloy density * (1-porous Al alloy porosity), 5%～20% of the reasonable opinion of surplus aluminium alloy casting amount can be taken as 5%, 7%, 10%, 15%, 20%, second step, mould 1 is placed on the sucker base 2 of negative pressure device 3, the aluminium alloy melt 4 after will being incubated again is cast in the mould 1, and with mould 1 be communicated in pressure for-2KPa～-negative pressure device 3 of 40KPa, negative pressure can be chosen for-2KPa,-4KPa ,-6KPa ,-8KPa,-10KPa,-20KPa ,-30KPa ,-40KPa, aluminium alloy melt infiltrates in the filler grain, and some aluminium alloy melt flows through upper plate 6, rests between upper plate 6 and the lower shoe 7 for the 3rd step, after treating aluminum alloy solidification, take out the complex body of filler grain and aluminium alloy, remove filler grain, can obtain 70%～95% porous Al alloy.
The through-hole porous aluminium alloy with high porosity that 2 one kinds of embodiment are obtained by embodiment 1 described method (aluminium alloy can be siliceous 6%～11% aluminum silicon alloy or the aluminum-copper alloy of cupric 4～10%), its porosity is 70%～95%, porosity can be 70%, 75%, 78%, 80%, 85%, 90%, 95%, void shape is polygon or sphere, and hole is evenly distributed, and mean pore size is 0.5～7mm, can be 0.5mm, 1.0mm, 3mm, 5mm, 7mm, through hole Du Keda 20%～35%.
3 one kinds of isolated plants that are used for the manufacturing through-hole porous aluminium alloy with high porosity of embodiment 1 described method of embodiment, comprise negative pressure system 3 and mould 1, one end of mould 1 is connected in negative pressure system 3, be placed with upper plate 6 and lower shoe 7 in the mould 1, wherein, upper plate 6 is that the grid length of side is the wire netting of 2～6mm, the length of side can be 2mm, 4mm, 6mm, lower shoe 7 (can be 100 orders for posting 100～200 orders, 150 orders, 200 orders) aperture of wire netting is the orifice plate of 2～6mm, and the aperture can be 2mm, 4mm, 6mm.
Claims (3)
1. a method of making through-hole porous aluminium alloy with high porosity is characterized in that comprising the steps:
The first step, take by weighing the aluminium alloy of certain mass, this quality is actual aluminium alloy casting quality, be heated to thawing, keeping the aluminium alloy melt temperature is 660 ℃～750 ℃, filler grain is packed in the mould (1), under 500 ℃～660 ℃, be incubated even to the filler grain temperature, wherein: actual aluminium alloy casting quality=theoretical aluminium alloy casting quality+surplus, theoretical aluminium alloy casting quality=filler grain accumulation body height * filler grain accumulation body cross-sectional area * aluminium alloy density * (1-porous Al alloy porosity), 5%～20% of the reasonable opinion of surplus aluminium alloy casting amount
Second step, mould (1) is placed on the sucker base (2) of negative pressure device (3), aluminium alloy melt (4) after will being incubated again is cast in the mould (1), and with mould (1) be communicated in pressure for-2KPa～-negative pressure device (3) of 40KPa, aluminium alloy melt infiltrates in the filler grain, and some aluminium alloy melt flows through upper plate (6), rests between upper plate (6) and the lower shoe (7)
The 3rd step, treat aluminum alloy solidification after, take out the complex body of filler grain and aluminium alloy, remove filler grain, obtain porosity and be 70%～95%, mean pore size is that 0.5～7mm, through hole degree are 20%～35% through-hole porous aluminium alloy with high porosity.
2. the method for manufacturing through-hole porous aluminium alloy with high porosity according to claim 1 is characterized in that void shape is polygon or sphere.
3. device that is used for the manufacturing through-hole porous aluminium alloy with high porosity of the described method of claim 1, comprise negative pressure system (3) and mould (1), one end of mould (1) is connected in negative pressure system (3), it is characterized in that being placed with in the mould (1) upper plate (6) and lower shoe (7), wherein, upper plate (6) is that the grid length of side is the wire netting of 2～6mm, and lower shoe (7) is 2～6mm and the orifice plate that posts 100～200 order wire nettings for the aperture.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100402684C (en) * | 2006-07-05 | 2008-07-16 | 东南大学 | Method and apparatus for preparing through-hole porous aluminium alloy with high porosity using plastic particles |
| US8151860B2 (en) * | 2007-02-16 | 2012-04-10 | Ecole Polytechnique Federale De Lausanne (Epfl) | Porous metal article and method of producing a porous metallic article |
| CN101740020B (en) * | 2009-11-30 | 2013-01-09 | 大连大学 | Open Al-Cu sound-absorbing material and preparation method thereof |
| CN103911523B (en) * | 2014-04-04 | 2015-11-18 | 中国科学院长春应用化学研究所 | The porous aluminum pore-creating preparation method of salt ball |
| CN107300493B (en) * | 2017-08-23 | 2020-06-09 | 青岛理工大学 | Manufacturing die and manufacturing method for pore rock sample |
| CN109465426B (en) * | 2018-12-28 | 2020-12-11 | 王楷煌 | High-performance through-hole foamed aluminum material and preparation process thereof |
| CN112126825B (en) * | 2020-08-10 | 2021-07-30 | 宁波悦威液压科技有限公司 | Hydraulic cylinder silencer and manufacturing process thereof |
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