CN1179808C - Stepped cooling and continuous casting method of massive amorphous alloy - Google Patents
Stepped cooling and continuous casting method of massive amorphous alloy Download PDFInfo
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- CN1179808C CN1179808C CNB021117098A CN02111709A CN1179808C CN 1179808 C CN1179808 C CN 1179808C CN B021117098 A CNB021117098 A CN B021117098A CN 02111709 A CN02111709 A CN 02111709A CN 1179808 C CN1179808 C CN 1179808C
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Abstract
The present invention relates to a stepped cooling and continuous casting method of massive amorphous alloy. Firstly, alloy materials are melted and overheated till the temperature is higher than the melting point of the alloy material in a crucible, and heat insulation is performed; then a crucible plunger is lifted so that molten alloy flows out from a cast gate at the bottom of the crucible and flows into a liquid flow disperser, and molten alloy that is dispersed into fine streams is quickly cooled down to around the nasal-tip temperature T<n> of a nucleation C curve in the falling process; finally, the low-temperature molten alloy is poured into a casting mould to get further cooled down to below the glass-transition temperature, and is condensed into amorphous alloy. The present invention has a simple technological method, and the stepped cooling method adopted by the present invention causes the molten alloy to get cooled down by the liquid flow disperser before the molten alloy enters a condenser and realizes continuous casting for massive amorphous alloy; the amorphous alloy prepared in the present invention has equivalent mechanical and physicochemical properties to amorphous alloy prepared by copper-mould gravity casting.
Description
Technical field:
The present invention relates to a kind of non-crystaline amorphous metal continuous casing, relate in particular to a kind of zirconium base large amorphous alloy stepped cooling and continuous casting method, belong to the metal material casting technology field.
Background technology:
Compare with common crystal alloy, non-crystaline amorphous metal has many superior mechanical properties and physical and chemical performance, therefore, the three-dimensional size all at the block casting non-crystal alloy more than the 1mm since last century, the nineties was succeeded in developing, be subjected to the extensive concern of Materials Science and Engineering circle.But, such material still requires higher cooling velocity when casting, its preparation method is confined to mainly at present that whole liquid is quenched, copper mold casting, metal mold high-pressure casting, suction pouring, extrusion casint, arc-melting be with (Fu Li such as stove condensations, the current situation of slow cooling bulk amorphous alloys, Metallic Functional Materials, 1998, supplementary issue, p39-53).
Indivedual researchers also test unidirectional solidification is large block amorphous.One of its realization means are, open a groove on the water-cooled crucible of vacuum arc furnace ignition, put into alloy material, and from one end to the other side in the mobile material, solidify on the fusing of margin limit at electric arc.The method of another kind of unidirectional solidification non-crystaline amorphous metal, then be to place the alloy material of cylindricality crucible to melt at the unidirectional solidification stove, quench downwards in the cooling fluid together with crucible then, in the decline process, finish alloy liquid gradually to the non-crystal (Z.P.Lu that solidifies, T.T.Goh, Y.Li and S.C.Ng, Glass formation in La-based La-Al-Ni-Cu-(Co) alloys by Bridgmansolidification and their glass forming ability, Acta Materialia, 1999, Vol.7, p2215-2224).
In fact, different with crystalline material, do not produce the solidified structure style in the amorphous forming process, the corresponding orientation problem that does not have tissue, the amorphous that any casting method obtains does not have the difference of essence on structure and performance, therefore compare with other large block amorphous casting method, how many advantages are above-mentioned two kinds of unidirectional solidification technology there is no, their same the same long casting molds with foundry goods of use that requires.
By contrast, bulk amorphous alloys just can be simplified casting mold if can realize continuous casting, significantly improves production efficiency.Yet, during the routine continuous casting, alloy liquid is to pour in the condenser with certain overtemperature, condenser not only will be derived alloy liquid liberated heat when melting temperature is reduced to glass transformation temperature, and to derive superheat when pouring temperature is reduced to melting temperature, thus appreciable impact the intensity of cooling of alloy liquid in condenser, make the continuous casting of the bulk amorphous alloys very difficulty that becomes.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of zirconium base large amorphous alloy stepped cooling and continuous casting method is provided, process for cooling when changing common metal material continuous casting, reduce the liquid metal temperature that enters condenser, realize the continuous casting of bulk amorphous alloys, the manufacturing for the non-crystaline amorphous metal part provides blank economically.
For realizing such purpose, in the technical scheme of the present invention, adopted the continuous casing of cooling step by step, in casting apparatus, increased liquid stream disperser, alloy liquid through the cooling of liquid stream disperser, poured into casting mold earlier again before entering condenser, further be cooled to below the glass transition temperature, condensation forms amorphous.
According to classical forming core theory, the incubation time that crosses cold alloy liquid forming core, the back prolonged, and promptly is so-called C curve shape along with the increase of degree of supercooling is shortened earlier.The key that alloy liquid forms amorphous is will be in the nose temperature T of C curve
nBelow cooling fast is in case alloy liquid is become merits and demerits to be chilled to T
nBelow, will reduce rapidly the requirement of intensity of cooling.The position of forming core C curve is also relevant with the triggering ability of casting mold liquid towards alloy forming core.Along with the reduction of casting mold triggering nucleation ability, C curve moves to right, and the critical cooling rate that forms amorphous reduces.When the heterogeneous body forming core was suppressed fully, this critical cooling rate became the order of magnitude to reduce.According to such the principles of science, concrete continuous casing of the present invention carries out as follows:
The first step: the bulk amorphous alloys material is melted, is superheated to the above 200-300 of its melting temperature ℃ in crucible, and handle in the insulation that this temperature was carried out 10-30 minute.
Alloy melts overheated resistance heated, eddy-current heating or other mode of heating of adopting in crucible, for alleviating the reaction between crucible and alloy liquid as possible, the crucible material should be selected the material manufacturing of chemical stability and Heat stability is good as far as possible for use.
Second step: mention the crucible plunger, alloy liquid is flowed out from the cast gate of crucible bottom, enter the liquid stream disperser of below.Be dispersed into many little stream thighs at this alloy liquid, in its dropping process, carry out forced heat-exchanging with inert gas, simultaneously outside radiant heat transfer, its temperature is cooled to T rapidly
nAbout temperature.
The flow of alloy liquid can be controlled by mentioning highly of pilot plunger.Alloy liquid cooling but intensity can be controlled by pressure, temperature or the flow regime of adjusting the inertia refrigerating gas.Specifically, if will make the very fast cooling of alloy liquid stream, can increase the pressure of inert gas.Because the chemism of bulk amorphous alloys is generally higher, its casting process will carry out in airtight space, and after gas pressure increase wherein, the heat exchange between metal liquid stream and gas is strengthened.The means of more efficiently raising alloy liquid stream cooling velocity are the speed of related movements that increases between inert gas and alloy liquid, and fan promptly is installed, and force gas to carry out forced convertion.For guaranteeing that the temperature of alloy liquid when arriving condenser is near T
n, can also suitably increase the distance of liquid stream disperser to condenser, the heat radiation time that promptly prolongs the liquid a fluid stream is reduced the temperature of alloy liquid.Liquid stream disperser can adopt the refractory material material to make.
The 3rd step: temperature is at T
nAbout low-temperature alloy liquid be poured into casting mold, and be further cooled to below the glass transition temperature, condensation forms amorphous.Be to strengthen cooling, available cooling fluid is forced cooling to solidifying phase.
The present invention makes condenser with non-crystalline material, or is coated with one deck amorphous coating on the surface of crystalline material condenser, can alleviate or eliminate the trigger action of condenser to the alloy forming core like this, helps improving the sectional dimension of amorphous ingot casting.
Liquid alloy of the present invention is the process that flows out from liquid stream disperser and fall, owing to just be subjected to the effect of inertia refrigerating gas, the triggering forming core effect of the solid matter beyond the alloy liquid has been avoided in any solid-state container contact of getting along well, so alloy liquid is to T
nIn the process of temperature cooling crystallization can not take place.And after flowing into condenser, because temperature has been near or below T
n, under low relatively cooling velocity, can form amorphous, therefore finally can cast out the non-crystaline amorphous metal ingot of large-size continuously.
Liquid stream disperser constitutes important step of the present invention.Because the alloy liquid temp is being reduced to T
nDuring temperature, viscosity is very big, and the fluid ability extreme difference is difficult for intactly being full of casting mold when entering into casting mold with the stream thigh of concentrating.After having used liquid stream disperser, guarantee that in design the cross sectional shape of a fluid stream of discharging from disperser is close with the ingot casting cross section, just can overcome the problem of low-temperature alloy liquid mold-filling capacity difference.When the amorphous ingot casting is the such revolution of cylinder, cylinder, can allow disperser in casting process, be rotated, can further improve in the condenser uniformity of liquid level everywhere thus.
Liquid stream disperser also can be used to control the flow of the liquid metal that enters condenser.If will improve casting speed, can suitably increase the total sectional area of disperser tap hole, and improve the flow of the alloy liquid that enters in the disperser by the opening degree that increases the crucible plunger.
Process of the present invention is simple, does not need a lot of equipment inputs, but has significant effect, has realized the continuous casting of bulk amorphous alloys, and prepared amorphous has the mechanics and the physical and chemical performance of working as with copper mold gravitational casting amorphous phase.
The non-crystaline amorphous metal ingot that uses continuous cast method of the present invention to produce can be used as the blank of making single-piece, small lot non-crystaline amorphous metal part, significantly shortens the production cycle of part thus, the mould manufacturing expense of conserve expensive.Such non-crystaline amorphous metal blank also can reheat and be cold liquid phase region, is rolled or extrusion molding, obtains amorphous sheet material, wire rod, or the part of other amorphous material that size is bigger, shape is more complicated.
For understanding technical scheme of the present invention better, be further described below in conjunction with drawings and the specific embodiments.
Description of drawings
The casting apparatus structural representation that Fig. 1 adopts for the present invention.
The specific embodiment
As shown in the figure, casting apparatus of the present invention has increased a liquid stream disperser 4 on the basis of existing apparatus, there is heating element heater 3 outside of crucible 1, centre in the crucible 1 is equipped with the plunger 2 of adjustable throttle amount, there is a liquid stream disperser 4 below of crucible 1, and there is the condenser 6 of cooling fluid of being filled with 7 liquid stream disperser 4 belows.
That alloy melts in crucible 1 is overheated (resistance heated, eddy-current heating or other mode of heating all can), pours into the liquid stream disperser 4 of refractory material material, and its flow can be controlled by mentioning highly of pilot plunger 2.Alloy liquid is divided into many thin stream thighs after through liquid stream disperser 4, such stream thigh is cooled in the process of free-falling, intensity of cooling is controlled by kind, temperature or the flow of adjusting the inertia refrigerating gas, guarantees that the temperature of alloy liquid when arriving condenser 6 is near T
nLow-temperature alloy liquid is finished to non-crystal transformation in condenser 6, casts amorphous continuously cast 8.
One embodiment of the present of invention adopt bulk amorphous alloys continuous casting apparatus as shown in Figure 1, have carried out Zr
55Al
10Cu
30Ni
5, Zr
60Al
10Cu
15Ni
10Pd
5And Zr
41.2Ti
13.8Cu
12.5Ni
10Be
22.5The continuous casting of alloy.The fusing of alloy and casting process are 5 * 10 at relative pressure
-6Carry out under the protection of the inertia high-purity argon gas of Pa.Alloy at first melts, is incubated in the high-frequency induction heating mode in corundum matter crucible, and rising pouring enters the porous disperser of quartz glass material, and its aperture is 3 millimeters.Alloy liquid falls to pouring into brass matrix after this is disperseed to form a fluid stream, the surface scribbles in the condenser of amorphous coating.Water flowing cooling in the condenser is cooled off coagulating partly with gallium indium alloy liquid simultaneously, makes the bulk amorphous alloys subcooled liquid finish transformation to amorphous in condenser.For making in the condenser everywhere liquid level uniformity as far as possible, make disperser be in slow rotary state in the test all the time.Utilize this method, finally obtained the Zr of diameter 30mm, long 500mm
55Al
10Cu
30Ni
5, Zr
60Al
10Cu
15Ni
10Pd
5And Zr
41.2Ti
13.8Cu
12.5Ni
10Be
22.5The non-crystaline amorphous metal rod.
Claims (1)
1, a kind of zirconium base large amorphous alloy stepped cooling and continuous casting method is characterized in that comprising the steps:
1) alloy material is melted, is superheated to the above 200-300 of its melting temperature ℃ in crucible, and handle in the insulation that this temperature was carried out 10-30 minute;
2) mention the crucible plunger, alloy liquid is flowed out from the cast gate bottom the crucible, enter the liquid stream disperser of below, the alloy liquid that is dispersed into tiny stream thigh carries out forced heat-exchanging with inert gas in dropping process, simultaneously outside radiant heat transfer, its temperature is cooled to the nose temperature T of forming core C curve rapidly
n
3) with temperature at T
nAlloy liquid pour into casting mold, further be cooled to below the glass transition temperature, condensation forms amorphous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021117098A CN1179808C (en) | 2002-05-16 | 2002-05-16 | Stepped cooling and continuous casting method of massive amorphous alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021117098A CN1179808C (en) | 2002-05-16 | 2002-05-16 | Stepped cooling and continuous casting method of massive amorphous alloy |
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| Publication Number | Publication Date |
|---|---|
| CN1389317A CN1389317A (en) | 2003-01-08 |
| CN1179808C true CN1179808C (en) | 2004-12-15 |
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| CNB021117098A Expired - Fee Related CN1179808C (en) | 2002-05-16 | 2002-05-16 | Stepped cooling and continuous casting method of massive amorphous alloy |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325206C (en) * | 2003-05-09 | 2007-07-11 | 燕山大学 | Continuous manufacture process of massive non-crystal alloy casting |
| CN105014027B (en) * | 2015-08-21 | 2017-03-22 | 天津市中重科技工程有限公司 | Molten steel pre-cooling device for high speed continuous casting machine |
| FR3061722B1 (en) * | 2017-01-09 | 2019-07-26 | Safran | INSTALLATION FOR MANUFACTURING A PART BY CARRYING OUT A BRIDGMAN PROCESS |
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2002
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