CN103240397A - Forced heat exchange method and device - Google Patents
Forced heat exchange method and device Download PDFInfo
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- CN103240397A CN103240397A CN2013102018984A CN201310201898A CN103240397A CN 103240397 A CN103240397 A CN 103240397A CN 2013102018984 A CN2013102018984 A CN 2013102018984A CN 201310201898 A CN201310201898 A CN 201310201898A CN 103240397 A CN103240397 A CN 103240397A
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Abstract
The invention discloses a forced heat exchange method. The forced heat exchange method is characterized by comprising a cooling roller which is a first-level cooling device, a cooling mould which is a second-level cooling device, and a cooling and material-receiving bucket which is a third-level cooling device, wherein the cooling mould is arranged at the downstream of the cooling roller and the upstream of the cooling and material-receiving bucket. The forced heat exchange device can cool high-temperature melting alloy rapidly, enable particles of product to be refined, and enable components and organizations to be distributed uniformly; the formed amorphous or microcrystalline rapid-hardening slice is 20-80 microns in thickness and 1-3 mm in width; a rapid-hardening alloy material product in a nanometer level (10-80 nm) crystal structure can be obtained after an annealing treatment; and the performances of the rapid-hardening alloy material containing NdFeB is improved greatly.
Description
Technical field
The present invention relates to a kind of method and apparatus of pressure heat exchange of vacuum rapid hardening alloy material preparation process, belong to the metallurgical material technical field, its method and device include but not limited to prepare vacuum rapid hardening alloy material.
Prior art
At present, prepare alloy material at metallurgy, when particularly preparing NdFeB material, generally be with molten alloy liquid spray, casting or overflow to atwirl chill roll surface, form the band of amorphous state or crystallite with rapid condensation, and directly be thrown to cooling in the container that connects material.
In said process, relate to molten alloy liquid and chill roll surface heat exchange takes place, this process need molten alloy liquid solidifies with enough fast cooling velocity, then may generate supersaturated solid solution, non-equilibrium crystal, further can generate noncrystal, so the rapid hardening technology of alloy liquid becomes particularly important, generally requiring the design of chill roll will satisfy molten alloy liquid can be with 10
5-10
6℃/cooling of the speed of s, in rapid hardening band production process, need adjust the rotating speed of chill roll and the flow of cooling medium etc., these factors all can influence the heat exchanger effectiveness of chill roll, influence the alloy material product quality.
On the other hand, quick setting belt breaks away from temperature behind the chill roll generally also at 500 ° more than the C, so, need cool off again quick setting belt, as can not in time fully cooling off, can cause adhesion, blue sheet phenomenon, the quality of product is caused great influence.In the prior art, the cooling of the secondary of quick setting belt generally is air-cooled or cooling naturally, or in the container that connects material cooling device is set, and cooling velocity is slow, and production efficiency is low, and greatly influences the quality of product.
Existing heat-exchange apparatus and production technology have been difficult to satisfy the production requirement of high-performance rapid hardening alloy material, have following shortcoming:
Chill roll and a whole set of cooling system can't satisfy the fast requirement of cooling of high-temperature fusion alloy liquid, cause adhesion, blue sheet phenomenon, cause alloy thin band uneven components, Tissue distribution inhomogeneous, and crystal grain are bigger, is difficult to produce the high performance alloys material product.
Summary of the invention
The purpose of this invention is to provide a kind of apparatus and method of forcing heat exchange, it cools off the high-temperature fusion alloy fast, make product grains refinement, composition and Tissue distribution even, the amorphous that forms or the rapid hardening sheet thickness of crystallite are 20-80 μ m, width is 1-3mm, can obtain the rapid hardening alloy material product of nanoscale (between the 10-80nm) crystal structure after the annealed processing, to realize comprising that the performance of NdFeB rapid hardening alloy material significantly promotes.
For this reason, according to an aspect of the present invention, provide a kind of pressure to carry out the device of heat exchange, it is characterized in that, having comprised: chill roll, it is first order cooling device; Cooling frame, it is second level cooling device; With the cooling bucket that connects material, it is third level cooling device; The upstream that described cooling frame is arranged on the downstream of chill roll and cools off the bucket that connects material.
Preferably, the top of chill roll is provided with the crucible that holds molten alloy liquid, and the lower end of this crucible is provided with sprays narrow slit or nozzle; Chill roll is provided with horizontal rotating shaft and inner circulating cooling medium circulation device; And/or chill roll is provided with 500-800 ℃ quick setting belt temperature controller.
Preferably, cooling frame is provided with apparatus for adjusting position and vibration frequency adjusting device; And/or cooling frame is provided with the vibration frequency controller of 5-80Hz and/or 200-300 ℃ the chilling temperature controller second time.
Preferably, described cooling connect material the bucket made by cast iron or steel, described cooling connect material the bucket periphery be provided with cooling tube; Cooling connect material the bucket the periphery, also be provided with barrel cooling device that connects material; And/or, cool off the bucket place that connects material and be provided with 25-45 ℃ the controller of chilling temperature for the third time.
Preferably, chill roll is provided with hydraulic controller, range that range is at least the 1-8 kilogram and is at least the range that 2-9 ton/hour water flow controller, range be at least after linear velocity controller, range that 1-8 ℃ of Inlet and outlet water differential temperature controller, range be at least 10-65m/s are at least the temperature controller before 1350-1550 ℃ the molten alloy liquid contact chill roll and/or arrive chill roll and is at least 10
5-10
6℃/but rate controller of the alloy liquid cooling of s.
According to another aspect of the present invention, provide a kind of pressure to carry out the method for heat exchange, it is characterized in that: may further comprise the steps:
1) molten alloy liquid rapid hardening: molten alloy liquid is ejected on the chill roll, by the quick cooling of chill roll, forms the quick setting belt of amorphous or crystallite, and flies out along the rotation tangential direction of chill roll;
2) cooling of quick setting belt, fragmentation: quick setting belt gets rid of into cooling frame, after the cooling frame fragmentation, disperseing cooling, forms flakes rapid hardening thin slice; And
3) cooling again of rapid hardening thin slice: flakes rapid hardening thin slice finally enters and cools off the bucket cooling again that connects material.
Preferably, molten alloy liquid from the crucible narrow slit be ejected into be equipped with the circulating cooling medium device along horizontal axis on the atwirl chill roll; And/or, in step 1) the hydraulic pressure of chill roll at the 1-8 kilogram, discharge the 2-9 ton/hour; The Inlet and outlet water temperature difference of chill roll is between 1-8 ℃; The linear velocity of chill roll is arranged between the 10-65m/s, according to product composition, final products property regulation; Temperature is between 1350-1550 ℃ before the molten alloy liquid contact chill roll, and alloy liquid arrives behind the chill roll with 10
5-10
6℃/cooling of the speed of s forms the quick setting belt of amorphous or crystallite.
Preferably, position and the vibration frequency thereof of cooling frame are conditioned, to form flakes rapid hardening thin slice; And/or the periphery of cooling off the bucket that connects material is provided with barrel cooling device that connects material.
Preferably, described cooling medium is water, the aqueous solution, liquid nitrogen and/or mineral wet goods, is preferably water.
Preferably, the quick setting belt temperature that forms in the step 1) is between 500-800 ℃; Step 2) vibration frequency of cooling frame is between the 5-80Hz in; Step 2) rapid hardening is taken to and is reached cooling frame and realize that cooled temperature is between 200-300 ℃ for the second time in; The rapid hardening thin slice arrives the cooling bucket that connects material and realizes that cooled temperature is between 25-45 ℃ for the third time in the step 3); And/or the whole process of step 1)-step 3) is carried out in the atmosphere that is filled with protection gas, and described protection gas refers to one or more in argon gas, helium, the nitrogen.
According to the present invention, described pressure heat-exchange device comprise chill roll, cooling frame, cooling connect material the bucket a multistage cooling device, between chill roll and material-receiving device, increased cooling frame, can make the properties of product of production obtain very big improvement.When quick setting belt is directly injected on the cooling frame with certain speed, produce bump, broken, and can increase zigzag or other shape thing in template, make quick setting belt be broken into flakes rapid hardening thin slice, cooling frame can be at X, Y, Z three direction of principal axis move, behind the fixed position can about, about, porpoise, make the rapid hardening thin slice loose off at cooling frame, thereby make cooling effect better, the present invention can be by the size of change cooling frame two panels and the vibration frequency of angle and cooling frame, time and decentralization that control rapid hardening thin slice stops in cooling frame make the prouctiveness of product and performance reach optimization.
Pressure heat change method according to the present invention, high-temperature fusion alloy liquid through chill roll cooling rapid hardening after, carry out secondary, three coolings step by step through cooling frame and the cooling bucket that connects material again, the performance of product has obtained great lifting.
According to the present invention, chill roll and a whole set of cooling system can satisfy the requirement of cooling fast of high-temperature fusion alloy, can make product grains refinement, composition and Tissue distribution even, the amorphous that forms or the rapid hardening sheet thickness of crystallite are 20-80 μ m, width is 1-3mm, can obtain nanoscale (between the 10-80nm) crystal structure rapid hardening alloy material product after the annealed processing, the present invention can realize that the performance that comprises NdFeB rapid hardening alloy material significantly promotes.
Description of drawings
Fig. 1 is the schematic diagram according to pressure heat change method principle of the present invention.
Fig. 2 is the structural representation according to chill roll of the present invention.
Fig. 3 is the side view according to cooling frame structure of the present invention.
Fig. 4 is the front view according to cooling frame structure of the present invention.
Fig. 5 is the structural representation according to the bucket that connects material of the present invention.
The specific embodiment
In Fig. 1, show pressure heat-exchange device of the present invention, thereby the device and method that can understand pressure heat exchange of the present invention better in the implementation process of preparation vacuum rapid hardening alloy material, this device comprises chill roll 1, cooling frame 2 and the cooling bucket 3 that connects material.
Fig. 2 shows chill roll, and described chill roll can around horizontal rotational shaft, the rotating speed of chill roll can be realized infinitely variable speeds by the driving of motor or transmission device; Described chill roll uses material to be in tungsten-molybdenum alloy, metal molybdenum, metallic copper, the copper alloy one or more, and present embodiment is selected tungsten-molybdenum alloy for use, and chill roll inside is provided with cavity and is used for logical cooling medium, and its surface is the interface of heat process.
Fig. 3-Fig. 4 shows a kind of cooling frame of forcing heat-exchange apparatus, and described cooling frame can be made with copper material, steel or alloy, and present embodiment is selected copper material for use;
Wherein, V-structure is that the two panels linking is made, and is top panel 4 and lower panel 5, and the folder degree angular range of two panels is 0～180 degree, and present embodiment is selected 110 degree for use;
Be provided with cooling device in the cooling frame, the back side of cooling frame top panel 4 and lower panel 5 is provided with hollow snake pipe device 7, is used for logical cooling medium;
Cooling frame can move along X, Y, three axis directions of Z, and can vibrate along the top to bottom, left and right, front and rear direction, and vibration frequency is adjustable, is driven by not shown transmission device.
Fig. 5 shows the bucket that connects material, described connect material bucket can be cylinder iron, steel etc. make, and comprise an open circles taper or cylindrical staving 8, its periphery is provided with cooling tube 9.
Cooling medium can be water, the aqueous solution, liquid nitrogen, mineral oil or their mixture.Present embodiment selects for use water as cooling medium.
Can realize following technology by said apparatus:
In the atmosphere that is filled with protection gas, high-temperature fusion alloy liquid (1350-1550 ℃) by crucible slit or nozzle ejection to chill roll 1.Chill roll 1 usefulness tungsten-molybdenum alloy is made, and is provided with inner chamber, and inner chamber is connected with high-pressure cooling water, and the linear velocity of chill roll 1 is adjustable continuously at 10-65m/s; The hydraulic pressure of chill roll about the 1-8 kilogram, discharge the 2-9 ton/hour about; The Inlet and outlet water temperature difference of chill roll is at 1-8 ℃.
Molten alloy liquid on chill roll 1 with 10
5-10
6The speed cooling of ° C/s forms the quick setting belt of amorphous or crystallite, afterwards, throws away along the tangential direction of chill roll 1, and at this moment, the quick setting belt temperature is between 500-800 ℃; Quick setting belt to the top panel 4 of cooling frame 2 carries out the secondary cooling, the vibration frequency of cooling frame 2 is adjustable between 5-80Hz, position and the vibration frequency of regulating cooling frame are extremely best, quick setting belt becomes the rapid hardening thin slice after the crenellation fragmentation, fall to lower panel 5 at a certain angle, rapid hardening thin slice plate 5 below disperses cooling, and at this moment, the temperature of rapid hardening thin slice is between 200-300 ℃; The rapid hardening thin slice arrives to cool off and carries out three coolings in the bucket 8 that connects material, and afterwards, temperature is down to 25-45 ℃, to obtain high-quality rapid hardening alloy material.
NdFeB magnetic powder is a kind of of vacuum rapid hardening alloy material, and the present invention can realize the significantly lifting of NdFeB magnetic powder performance, for example, can obtain embodying in following each embodiment.
According to the present invention, a kind of method and device thereof of forcing heat exchange is provided, described pressure heat-exchange device comprises: chill roll, cooling frame, cooling connect material the bucket a multistage cooling device.
The described chill roll of described pressure heat-exchange device uses material to be in tungsten-molybdenum alloy, metal molybdenum, metallic copper, the copper alloy one or more, and preferred tungsten-molybdenum alloy or copper alloy are because tungsten-molybdenum alloy or copper alloy have heat conductivity well; Chill roll is truncated cone-shaped or cylindrical structural; The rotating speed of chill roll can be realized infinitely variable speeds; The chill roll indoor design has circulating cooling system;
The described cooling frame of described pressure heat-exchange device can be made with copper material, steel or its alloy;
Cooling frame is V-structure, and described V-structure is that the two panels linking is made, and the angular range of the angle of two panels is adjustable;
In two panels, the front of top panel is the face that has sawtooth, and the back side is band cooling device face, and the lower panel front is that smooth flat, the back side are band cooling device face;
Cooling device is set in the cooling frame, and cooling frame top panel and lower panel are provided with hollow snake pipe or hollow coolant jacket, are used for logical cooling medium;
Cooling frame can move at X, Y, Z three direction of principal axis, and can vibrate top to bottom, left and right, front and rear, and vibration frequency is adjustable;
The described cooling of described pressure heat-exchange device connects material bucket can be cylinder iron, steel etc. makes, and the described cooling barrel periphery that connects material is provided with cooling tube;
Described cooling medium is water, the aqueous solution, liquid nitrogen and/or mineral wet goods, is preferably water, because it is inexpensive, nontoxic, do not burn, physical and chemical performance is stable, cooling capacity is strong;
The present invention also provides a kind of method of forcing heat exchange, and this process comprises following steps:
1) molten alloy liquid rapid hardening: molten alloy liquid from the melting cup narrow slit be ejected into be equipped with water-circulating cooling device along horizontal axis on the atwirl chill roll.By the quick cooling of chill roll, form the quick setting belt of amorphous or crystallite, rotate tangential direction along chill roll and throw away.
2) cooling of quick setting belt, fragmentation: quick setting belt gets rid of into cooling frame, and position and the vibration frequency thereof of regulating cooling frame are extremely best, and quick setting belt becomes flakes rapid hardening thin slice after cooling frame fragmentation, dispersion cooling.
3) cooling again of rapid hardening thin slice: flakes rapid hardening thin slice finally enters and cools off the bucket cooling again that connects material.
The hydraulic pressure of chill roll is at the 1-8 kilogram in step 1), discharge the 2-9 ton/hour; The Inlet and outlet water temperature difference of chill roll is at 1-8 ℃; The linear velocity of chill roll is arranged between the 10-65m/s, preferably between the 15-40m/s, according to product composition, final products property regulation; Temperature is between 1350-1550 ℃ before the molten alloy liquid contact chill roll, and alloy liquid arrives behind the chill roll with 10
5-10
6℃/cooling of the speed of s forms the quick setting belt of amorphous or crystallite.
If alloy temperature is too high in the quick setting belt forming process of above-mentioned amorphous or crystallite, the cooling rate of chill roll is limited again, may have little time cooling by alloy so, what gush out just may be liquid alloy, if but temperature is low excessively, it is mobile not enough, may cause nozzle or narrow slit to stop up, so control alloy liquid temp is very important.It is to have taken into full account above-mentioned two factors that the temperature range of molten alloy liquid of the present invention is 1350-1550 ℃.
Among the present invention, the setting of the linear velocity of chill roll considers that it is subjected to the influence of many-sided factor, as the material of the distance of composition, slit or the nozzle of alloy and chill roll, chill roll, cooling medium in the chill roll and flow velocity thereof etc., wheel speed can be according to many factors vary.
Among the present invention, the vibration frequency of cooling frame is between the 5-80Hz, and the vibration frequency speed can influence the cooldown rate of quick setting belt (sheet), can regulate vibration frequency and control quick setting belt (sheet) in the time of staying of cooling frame and disperse cooling effect.
Among the present invention, be between 500-800 ℃ in the quick setting belt temperature that chill roll forms, can realize by discharge and the rotating speed of control chill roll; Quick setting belt arrives cooling frame and has realized the secondary cooling, forms the rapid hardening thin slice, and cooling back temperature can realize by the vibration frequency of control cooling frame between 200-300 ℃; The rapid hardening thin slice arrives the cooling bucket that connects material again and has realized three coolings, and cooling back temperature is between 25-45 ℃; By the control temperature of cooling each time, can not produce blue sheet and its micro-structural uniformity so that amorphous or crystallite quick setting belt (sheet) can adhesions, amorphous or crystallite quick setting belt (sheet) can obtain high quality of products after the subsequent handling crystallization and thermal treatment.
Whole process described above is all carried out in the atmosphere that is filled with protection gas, and described protection gas refers to one or more in argon gas, helium, the nitrogen;
Because the rapid hardening alloy material contains elements such as rare earth, its easy oxidation is so need carry out in protective gas atmosphere.
Embodiment 1: NdFeB magnetic powder model 1
In the present embodiment, force the condition of heat exchange to be: the temperature of alloy liquid is about 1445 ℃, about the linear velocity 33m/s of chill roll; The hydraulic pressure of chill roll is about 4 kilograms, and discharge is about 5 tons/hour; The chill roll Inlet and outlet water temperature difference is between 2-5 ℃.Quick setting belt throws away back arrival cooling frame 2 from the tangent line of chill roll 1, mobile cooling frame 2 is to position the best, the vibration frequency of cooling frame 2 is about 30Hz, after cooling frame 2 fragmentation just and disperseing cooling, the rapid hardening thin slice arrives and cools off cooling again in the bucket 8 that connects material, and the rapid hardening thin slice is broken into thin magnetic again through disintegrating machine, after annealing 8 minutes about 700 ℃ in annealing furnace, measure its main magnetic property with magnetic phase oscillations instrument (VSM), adopt ESEM (SEM) to observe its average grain size.
Following table is NdFeB magnetic powder model 1 performance table
Embodiment 2: NdFeB magnetic powder model 2
In the present embodiment, force the condition of heat exchange to be: the temperature of alloy liquid is about 1430 ℃, about the linear velocity 28m/s of chill roll; The hydraulic pressure of chill roll is about 4 kilograms, and discharge is about 5 tons/hour; The chill roll Inlet and outlet water temperature difference is between 2-5 ℃.Quick setting belt throws away back arrival cooling frame from the tangent line of chill roll 1, mobile cooling frame 2 is to position the best, the vibration frequency of cooling frame is about 40Hz, after cooling frame 2 fragmentation just and disperseing cooling, rapid-hardening flake arrives cools off cooling again in the bucket 8 that connects material, and rapid-hardening flake is broken into fine powder again through disintegrating machine, after annealing 10 minutes about 700 ℃ in annealing furnace, measure its main magnetic property with magnetic phase oscillations instrument (VSM), adopt ESEM (SEM) to observe its average grain size.
Following table is NdFeB magnetic powder model 2 performance tables
Embodiment 3: NdFeB magnetic powder model 3
In the present embodiment, force the condition of heat exchange to be: the temperature of alloy liquid is about 1450 ℃, about the linear velocity 38m/s of chill roll; The hydraulic pressure of chill roll is about 5 kilograms, and discharge is about 6 tons/hour; The chill roll Inlet and outlet water temperature difference is between 2-5 ℃.Quick setting belt throws away back arrival cooling frame 2 from the tangent line of chill roll 1, mobile cooling frame 2 is to position the best, the vibration frequency of cooling frame 2 is about 45HZ, after cooling frame 2 fragmentation just and disperseing cooling, the rapid hardening thin slice arrives and cools off cooling again in the bucket 8 that connects material, and the rapid hardening thin slice is broken into thin magnetic again through disintegrating machine, after annealing 6 minutes about 700 ℃ in annealing furnace, measure its main magnetic property with magnetic phase oscillations instrument (VSM), adopt ESEM (SEM) to observe its average grain size.
Following table is NdFeB magnetic powder model 3 performance tables
Above-mentioned listed examples is intended to further set forth with the present invention forces heat-exchange device and method to obtain the feasibility of high-performance rapid hardening alloy material, and protection scope of the present invention is not constituted any restriction.
Claims (10)
1. the device that heat exchange is carried out in pressure is characterized in that, comprising:
Chill roll, it is first order cooling device;
Cooling frame, it is second level cooling device; With
Cool off the bucket that connects material, it is third level cooling device; The upstream that described cooling frame is arranged on the downstream of chill roll and cools off the bucket that connects material.
2. device as claimed in claim 1 is characterized in that,
The top of chill roll is provided with the crucible that holds molten alloy liquid, and the lower end of this crucible is provided with sprays narrow slit or nozzle;
Chill roll is provided with horizontal rotating shaft and inner circulating cooling medium circulation device; And/or
Chill roll is provided with 500-800 ℃ quick setting belt temperature controller.
3. device as claimed in claim 1 is characterized in that,
Cooling frame is provided with apparatus for adjusting position and vibration frequency adjusting device; And/or
Cooling frame is provided with the vibration frequency controller of 5-80Hz and/or 200-300 ℃ the chilling temperature controller second time.
4. device as claimed in claim 1 is characterized in that,
Described cooling connect material the bucket made by cast iron or steel, described cooling connect material the bucket periphery be provided with cooling tube;
Cooling connect material the bucket the periphery, also be provided with barrel cooling device that connects material; And/or
Cool off the bucket place that connects material and be provided with 25-45 ℃ the controller of chilling temperature for the third time.
5. device as claimed in claim 1 is characterized in that,
Chill roll be provided with hydraulic controller that range is at least the 1-8 kilogram,
Range be at least 2-9 ton/hour water flow controller,
Range be at least 1-8 ℃ of Inlet and outlet water differential temperature controller,
Range be at least 10-65m/s the linear velocity controller,
Range be at least before 1350-1550 ℃ the chill roll molten alloy liquid temp controller and/or
Range behind the arrival chill roll is at least 10
5-10
6℃/but rate controller of the alloy liquid cooling of s.
6. method that heat exchange is carried out in pressure is characterized in that: may further comprise the steps:
1) molten alloy liquid rapid hardening: molten alloy liquid is ejected on the chill roll, by the quick cooling of chill roll, forms the quick setting belt of amorphous or crystallite, and flies out along the rotation tangential direction of chill roll;
2) cooling of quick setting belt, fragmentation: quick setting belt gets rid of into cooling frame, after the cooling frame fragmentation, disperseing cooling, forms flakes rapid hardening thin slice; And
3) cooling again of rapid hardening thin slice: flakes rapid hardening thin slice finally enters and cools off the bucket cooling again that connects material.
7. method as claimed in claim 6 is characterized in that,
Molten alloy liquid from the crucible narrow slit be ejected into be equipped with the circulating cooling medium device along horizontal axis on the atwirl chill roll; And/or,
The hydraulic pressure of chill roll is at the 1-8 kilogram in step 1), discharge the 2-9 ton/hour; The Inlet and outlet water temperature difference of chill roll is between 1-8 ℃; The linear velocity of chill roll is arranged between the 10-65m/s, according to product composition, final products property regulation; Temperature is between 1350-1550 ℃ before the molten alloy liquid contact chill roll, and alloy liquid arrives behind the chill roll with 10
5-10
6℃/cooling of the speed of s forms the quick setting belt of amorphous or crystallite.
8. method as claimed in claim 6 is characterized in that,
Position and the vibration frequency thereof of cooling frame are conditioned, to form flakes rapid hardening thin slice; And/or
The periphery of cooling off the bucket that connects material is provided with barrel cooling device that connects material.
9. method as claimed in claim 6 is characterized in that, described cooling medium is water, the aqueous solution, liquid nitrogen and/or mineral wet goods, is preferably water.
10. method as claimed in claim 6 is characterized in that,
The quick setting belt temperature that forms in the step 1) is between 500-800 ℃; Step 2) vibration frequency of cooling frame is between the 5-80Hz in;
Step 2) rapid hardening is taken to and is reached cooling frame and realize that cooled temperature is between 200-300 ℃ for the second time in
The rapid hardening thin slice arrives the cooling bucket that connects material and realizes that cooled temperature is between 25-45 ℃ for the third time in the step 3); And/or
The whole process of step 1)-step 3) is carried out in the atmosphere that is filled with protection gas, and described protection gas refers to one or more in argon gas, helium, the nitrogen.
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Cited By (1)
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| CN108927501A (en) * | 2018-07-20 | 2018-12-04 | 山东海瑞得新材料科技有限公司 | A kind of Fe-based amorphous band and preparation method thereof that lamination coefficient is high |
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Application publication date: 20130814 |