CN101984103B - Method for preparing foam magnesium alloy from magnesite by secondary foaming - Google Patents
Method for preparing foam magnesium alloy from magnesite by secondary foaming Download PDFInfo
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- CN101984103B CN101984103B CN2010105748379A CN201010574837A CN101984103B CN 101984103 B CN101984103 B CN 101984103B CN 2010105748379 A CN2010105748379 A CN 2010105748379A CN 201010574837 A CN201010574837 A CN 201010574837A CN 101984103 B CN101984103 B CN 101984103B
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- aluminum alloy
- giobertite
- magnesium
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- foam aluminum
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Abstract
The invention relates to a method for preparing foam magnesium alloy from magnesite by secondary foaming, which is characterized by comprising the following steps: 1, melting and proportioning flame-retardant magnesium alloy; 2, cooling molten magnesium to 550-620 DEG C; 3, insulating the foam magnesium alloy blank at 300-500 DEG C for 5-25 minutes; and 4, putting the foam magnesium alloy blank in a mold, carrying out secondary thermal decomposition on the magnesite powder in the foam magnesium alloy blank at 550-700 DEG C to generate secondary foaming, and quickly cooling to obtain the foam magnesium alloy product. The method uses natural magnesite as the foaming agent and tackifier to prepare foam magnesium alloy and special-shaped pieces, thereby greatly lowering the production cost of foam magnesium alloy. The invention has the advantage of simple preparation technique, and is suitable for large-scale industrial production.
Description
Technical field
The present invention relates to a kind of method for preparing foam aluminum alloy, relate in particular to a kind of method that adopts the giobertite secondary foamization to prepare foam aluminum alloy.
Background technology
The foam magnesium material compare with foamed aluminium material have better damping and amortization, anti-electro permanent magnetic, have lightweight that other material institute at present can not have simultaneously, noise elimination, stagnant shake, electromagnetic shielding and function such as anti-aging.Owing to have above-mentioned good performance; The foam magnesium material can be used to make sourdine; Vibroshock, interchanger, solar collector, support of the catalyst, electro-magnetic shielding cover and make metallic material components in light weight, that intensity is high etc. maybe for solving that many great technical barriers provide.For example, utilize foamed metal material good sound absorption characteristic can solve the automobile of long-term puzzlement environment, the exhaust noise silencing problem of motorcycle engine, can be used as the sandwich material of aircraft structure, the sound insulation wallboard of motorway etc.
Because MAGNESIUM METAL 99 is higher, inflammable than metallic aluminium chemically reactive, be prone to oxidation, thermal capacity is little, these unfavorable factors make preparation foam magnesium be stranded much more difficult than the preparation foamed aluminium.RP of delivering about aspects such as the preparation of foam magnesium and performances at present and disclosed patent seldom, even not enough foamed aluminium 1%.The prepared foamed aluminium that goes out of foam melt method all has affixed merchandise in many countries, and foam magnesium is difficult to find the manufacturer or the dealer of volume shipment, and the countries in the world majority rests on laboratory study or lab scale stage.The main preparation methods of foam magnesium has seepage flow casting, lost wax process, powder metallurgic method, vacuum suction casting technique and foam melt method etc. at present.The existing method ubiquity for preparing the foam magnesium material complicated process of preparation, defect of high cost.
Foam melt method technology is one of the most promising method that can prepare the big specification foamed metal sheet material that accords with the demands of the market, but adopts this prepared foam magnesium also to exist some key issues still unresolved.Through the retrieval discovery to existing document and patent, Chinese patent ZL 200510047728.0 relates to and utilizes the direct foaming of melt mass legal system to be equipped with the foam magnesium material.Use 5～30% silit as tackifier in this patent; 2～20% magnesiumcarbonate powder is as whipping agent; Its weak point is that the price of tackifier silit and whipping agent magnesiumcarbonate powder is all higher, is unfavorable for the reduction and the industrialized developing of the production cost of foam magnesium.CNl01135015 discloses a kind of flux foaming preparation method of foam magnesium, uses 2～8% metallic calcium powder as tackifier in this technology, and 2～15% lime carbonate is as whipping agent, 620～700 ℃ down foaming make foam magnesium.CN101608278A discloses a kind of flame-retardant foam magnesium alloy and preparation method thereof, and the tackifier that use in this technology are metallic calcium powder, and whipping agent is 100～400 purpose Paris whites, and blowing temperature is 630～770 ℃.The main deficiency of CNl01135015 and CN101608278A is that tackifier metallic calcium powder price is higher, and is not easy to transportation and preservation; The complete decomposition temperature of whipping agent lime carbonate is higher, causes magnesiumalloy oxidation aggravation, and mechanical properties decrease is unfavorable for the preparation of foam magnesium.
Summary of the invention
The object of the present invention is to provide a kind of method that adopts the giobertite secondary foamization to prepare foam aluminum alloy, adopting the magnisite masonry is that whipping agent and tackifier secondary foamization prepare foam magnesium, and technology is simple, production cost is low.
The present invention realizes that like this method steps is:
The first step: the molten antiflaming magnesium alloy of joining, and, add the giobertite powder that accounts for magnesium liquid massfraction 0.1～1.5% at 630～730 ℃ of insulation 10～20min, giobertite powder granularity is the 200-300 order, stirs 2～10min with 400～1500rpm rotating speed;
Second step: the magnesium liquid temp is reduced in 550～620 ℃ of scopes; Add the giobertite powder that accounts for magnesium liquid massfraction 0.5%～4.0%; The granularity of giobertite powder is 30～200 orders, behind rotating speed 1000～2000rpm stirring 2～5min, magnesium liquid is cast in the mould; Cooling rapidly then, the foam aluminum alloy blank of formation low porosity;
The 3rd step: above-mentioned foam aluminum alloy blank is incubated 5～25min in 300～500 ℃ of scopes;
The 4th step: above-mentioned foam aluminum alloy blank is put in the mould, in 550～700 ℃ of scopes, makes the giobertite powder secondary thermolysis in the foam aluminum alloy blank produce secondary foamization, cooling obtains the foam aluminum alloy goods fast.
Said antiflaming magnesium alloy is to add the calcium metal of massfraction 1～3% and 0～0.5% mishmetal in commerce in magnesiumalloy.
Said magnesiumalloy can be a kind of of magnalium system, magnesium zinc system, magnesium rare earth-based alloy.
The magnisite stone of being taken is the general magnisite stone in market and gets final product, and magnisite stone is not had strict requirement.
Advantage of the present invention is: 1) to adopt the magnisite masonry be that whipping agent and tackifier prepare foam aluminum alloy and abnormal member in the present invention, significantly reduced the production cost of foam aluminum alloy, and preparation technology is simple, is suitable for fairly large industrial production.
2) the present invention is as the 30-200 purpose mineral powder of magnesite of whipping agent; Add temperature and be lower than 620 ℃; Only prepare in the blank process at foam aluminum alloy and can decompose a few part, more mineral powder of magnesite decomposes in second-heating, helps the secondary foamization of foam aluminum alloy blank.
3) the present invention just possibly decompose more than 600～700 ℃ as the giobertite Heat stability is good of whipping agent fully, and the secondary foam temperature of this and foam aluminum alloy is more mated.Under this temperature, giobertite fully decomposes, produces in the secondary foam process, and to fill the type motivating force maximum, helps the formation of foam magnesiumalloy and abnormal member.
4) the present invention adds in 630～730 ℃ of scopes as 200～300 purpose mineral powder of magnesite of tackifier; In the tackify process, decompose in a large number, exist in the melt and generate multiple solid phase particles, like MgO; Can become foam heterogeneous nucleation core; Be suspended in the viscosity that has improved melt in the melt, strengthened foamy stability, make a large amount of micro-bubbles be able to form spherical pore foam aluminum alloy blank.
In the preparation process, following reaction mainly takes place in tackifier and Mg melt:
MgCO
3[s]=MgO[s]+CO
2[g]
2Mg[l]+CO
2[g]=2MgO[s]+C[s]
4Mg[l]+CO
2[g]=?Mg
2C[s]+2MgO
5) to adopt the magnisite masonry be that the method for whipping agent prepares foam aluminum alloy and abnormal member in the present invention; The blank of preparation is incubated under 300～500 ℃ of temperature the foam aluminum alloy blank is heated up sooner to reach the secondary foam temperature; Make blank in the secondary foam process, keep higher solid rate, produce escape of gas to prevent that giobertite from decomposing.
6) the present invention can pass through the granularity and the add-on of control magnesite stone flour, and suitable churning time and the whipping temp of control, to produce the foam magnesium products in different apertures.
7) the present invention adopts the method for calcium metal and mixed rare earth alloyization to realize the fire-retardant of magnesiumalloy; The molten in advance antiflaming magnesium alloy for preparing, the foam magnesium subsequently prepare and need not mixed gas protectedly in the process, have simplified the production technique of foam magnesium; Practiced thrift cost, reduced pollution environment.
Embodiment
Below in conjunction with concrete embodiment embodiment of the present invention is further specified:
Embodiment 1:
The first step: the molten 1000 gram ZM5-2.5%Ca-0.1%Re alloys of joining, alloy is incubated 10min down at 700～730 ℃, adding accounts for magnesium liquid massfraction 0.3%, 200 purpose giobertite powder, stirs 5min with the 800rpm rotating speed;
Second step: the magnesium liquid temp is reduced to 600 ℃, and adding accounts for magnesium liquid massfraction 1%, 100 purpose giobertite powder, behind rotating speed 1500rpm stirring 3min, magnesium liquid is cast in the mould, is cooled to the foam aluminum alloy blank that forms low porosity then rapidly;
The 3rd step: above-mentioned foam aluminum alloy blank is incubated 15min in 450 ℃ of scopes;
The 4th goes on foot: above-mentioned foam aluminum alloy blank is put in the mould makes giobertite powder secondary thermolysis generation secondary foamization in the blank at 620 ℃, cooling obtains the foam aluminum alloy goods fast.
The foam magnesium sample average aperture that finally obtains is 1mm, and density is 0.7g/cm
3
Embodiment 2:
The first step: the molten 1000 gram ZM1-2%Ca-0.2%Re alloys of joining, be incubated 15min down at 700～730 ℃, adding accounts for magnesium liquid massfraction 0.5%, 250 purpose giobertite powder, stirs 5min with the 900rpm rotating speed;
Second step: the magnesium liquid temp is reduced to 620 ℃, and adding accounts for magnesium liquid massfraction 1.5%, 60 purpose giobertite powder, behind rotating speed 1500rpm stirring 4min, magnesium liquid is cast in the mould, is cooled to the foam aluminum alloy blank that forms low porosity then rapidly;
The 3rd step: above-mentioned foam aluminum alloy blank is incubated 15min in 500 ℃ of scopes;
The 4th goes on foot: above-mentioned foam aluminum alloy blank is put in the mould makes giobertite powder secondary thermolysis generation secondary foamization in the blank at 650 ℃, cooling obtains the foam aluminum alloy goods fast.
The foam magnalium sample average aperture that finally obtains is 4 mm, and density is 0.5g/cm
3
Embodiment 3:
The first step: the molten 1000 gram ZM3-3%Ca alloys of joining, be incubated 15min down at 700～730 ℃, adding accounts for magnesium liquid massfraction 0.7%, 300 purpose giobertite powder, stirs 6min with the 1000rpm rotating speed;
Second step: the magnesium liquid temp is reduced to 590 ℃, and adding accounts for magnesium liquid massfraction 2%, 200 purpose giobertite powder, behind rotating speed 1600rpm stirring 5min, magnesium liquid is cast in the mould, is cooled to the foam aluminum alloy blank that forms low porosity then rapidly;
The 3rd step: above-mentioned foam aluminum alloy blank is incubated 13min at 500 ℃;
The 4th goes on foot: above-mentioned foam aluminum alloy blank is put in the mould makes giobertite powder secondary thermolysis generation secondary foamization in the blank at 610 ℃, cooling obtains the foam aluminum alloy goods fast.
The foam magnesium-rare earth alloy sample average aperture that finally obtains is 0.5 mm, and density is 0.45g/cm
3
Claims (3)
1. method that adopts the giobertite secondary foamization to prepare foam aluminum alloy is characterized in that method steps is:
The first step: the molten antiflaming magnesium alloy of joining; And at 630～730 ℃ of insulation 10～20min; Add the giobertite powder that accounts for magnesium liquid massfraction 0.1～1.5% and carry out the melt tackify, giobertite powder granularity is 200～300 orders, stirs 2～10min with 400～1500rpm rotating speed;
Second step: the magnesium liquid temp is controlled in 550～620 ℃ of scopes; The giobertite powder that adding accounts for magnesium liquid massfraction 0.5%～4.0% is as whipping agent; The granularity of giobertite powder is 30～100 orders, behind rotating speed 1000～2000rpm stirring 2～5min, magnesium liquid is cast in the mould; Cooling rapidly then, the foam aluminum alloy blank of formation low porosity;
The 3rd step: above-mentioned foam aluminum alloy blank is incubated 5～25min in 300～500 ℃ of scopes;
The 4th step: above-mentioned foam aluminum alloy blank is put in the mould, in 550～700 ℃ of scopes, makes the giobertite powder secondary thermolysis in the foam aluminum alloy blank produce secondary foamization, cooling obtains the foam aluminum alloy goods fast.
2. employing giobertite secondary foamization according to claim 1 prepares the method for foam aluminum alloy, it is characterized in that said antiflaming magnesium alloy is to add the calcium metal of massfraction 1～3% and 0～0.5% mishmetal in commerce in magnesiumalloy.
3. employing giobertite secondary foamization according to claim 1 prepares the method for foam aluminum alloy, it is characterized in that said magnesiumalloy is a kind of of magnalium system, magnesium zinc system, magnesium rare earth-based alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105748379A CN101984103B (en) | 2010-12-06 | 2010-12-06 | Method for preparing foam magnesium alloy from magnesite by secondary foaming |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105748379A CN101984103B (en) | 2010-12-06 | 2010-12-06 | Method for preparing foam magnesium alloy from magnesite by secondary foaming |
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| CN101984103A CN101984103A (en) | 2011-03-09 |
| CN101984103B true CN101984103B (en) | 2012-05-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106367627A (en) * | 2016-09-14 | 2017-02-01 | 郑州峰泰纳米材料有限公司 | Method for preparing foamed magnesium alloy through secondary foaming |
| CN108048683B (en) * | 2017-12-22 | 2020-05-19 | 中国科学院长春应用化学研究所 | Foaming device and method for porous magnesium alloy |
| CN109778036B (en) * | 2019-03-04 | 2020-10-16 | 东南大学 | Foam alloy for foaming in space environment and preparation method thereof |
| CN110373563B (en) * | 2019-08-26 | 2020-06-23 | 南昌航空大学 | Foam magnesium composite board and preparation method thereof |
| CN112746193B (en) * | 2020-12-17 | 2022-06-17 | 北京科技大学 | Preparation method of foam magnesium or magnesium alloy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338388A (en) * | 2008-08-26 | 2009-01-07 | 东南大学 | Method for preparing foamed aluminium and aluminum alloy by secondary foaming with novel blowing agent |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338388A (en) * | 2008-08-26 | 2009-01-07 | 东南大学 | Method for preparing foamed aluminium and aluminum alloy by secondary foaming with novel blowing agent |
Non-Patent Citations (1)
| Title |
|---|
| 周全，陈乐平.熔体发泡法制备泡沫镁材料的研究.《特种铸造及有色合金》.2009,第29卷(第3期), * |
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