CN112695261A - Iron-based amorphous alloy strip, preparation method thereof and single-roller rapid quenching device for iron-based amorphous alloy strip - Google Patents
Iron-based amorphous alloy strip, preparation method thereof and single-roller rapid quenching device for iron-based amorphous alloy strip Download PDFInfo
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Abstract
The invention provides an iron-based amorphous alloy strip which has continuous and stable grains; the roller-attaching surface and the free surface of the iron-based amorphous alloy strip are provided with lines at the area of more than or equal to 95%, and the line interval is 1.5-4.0 mm. The application also provides a preparation method of the iron-based amorphous alloy strip. Furthermore, the application also provides a single-roller rapid quenching device for the iron-based amorphous alloy strip. The invention realizes uniform, stable and continuous appearance of the grain of the iron-based amorphous alloy strip by stably controlling the casting environment of the weld pool, reducing the roughness of the surface of the cooling roller and further improving the surface quality of the cooling roller, and is finally beneficial to improving the performance.
Description
Technical Field
The invention relates to the technical field of iron-based amorphous alloy strips, in particular to an iron-based amorphous alloy strip, a preparation method thereof and a single-roller rapid quenching device for the iron-based amorphous alloy strip.
Background
The iron-based amorphous strip has excellent soft magnetic performance and can be used as an iron core material of a distribution transformer; compared with the traditional transformer manufactured by using silicon steel sheets, on one hand, the iron-based amorphous alloy is easy to magnetize, so that the no-load loss of the transformer is greatly reduced, and on the other hand, the traditional preparation process of the silicon steel sheets needs a plurality of process links and dozens of processes from steel making, casting, steel ingot cogging, blooming, annealing, hot rolling, annealing, acid washing, finish rolling and shearing to a sheet finished product.
However, the basic performance of the amorphous strip has certain fluctuation, which leads to certain difference in the quality of the strips produced in the same batch, and also leads to the problem that the stability in the using process cannot be met in the aspect of customers, thus causing the customer complaint rate to be improved. The data is analyzed empirically, so that the strip has continuous and regular grains, and the basic performance of the grains on the surface (called as a roll surface) of the strip close to a cooling body and the surface (called as a free surface) far away from the cooling body is better than the basic performance of the grains on the free surface, such as the random, intermittent and sometimes non-transmission grains on the roll surface.
In patent publication No. CN 103348420B, it is mentioned that the reduction of the temperature distribution in the width direction of the nozzle and the average roughness between 0.1-1 μm can inhibit the vibration of the molten alloy, thereby controlling the fluctuation of the strip texture; however, the influence factors that can influence the texture of the strip need to be considered comprehensively from the whole environmental factors generated by the strip and the contact object, and the temperature uniformity in the width direction of the nozzle is only one of the influence factors, but not all of the influence factors. In addition, it is pointed out in Shenyang university of Industrial science (Vol. C.8, fourth No. 22, 2000) that when the contact angle between the free surface of the puddle and the surface of the cooling roll is less than a certain critical value, air pockets are formed because the nozzle slit is partially blocked to form a low pressure region, which causes the air pockets to diffuse in the puddle, causing the molten metal and the cooling body to fluctuate, and the free surface to be affected, thereby causing periodic variations; meanwhile, when the casting is carried out on the smooth cooling roller surface, fishbone-shaped defects cannot be eliminated, but the cooling roller with the rough surface does not have periodic surface fluctuation any more, because the forming mechanism of air pockets changes, and the influence caused by periodic instability of weld puddle can be ignored. In view of the above research, a method capable of obtaining continuous and stable amorphous strip lines is of great significance.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the iron-based amorphous alloy strip, and the iron-based amorphous alloy strip provided by the application has continuous and stable grains.
In view of the above, the present application provides an iron-based amorphous alloy strip having continuous and stable grains; the roller-attaching surface and the free surface of the iron-based amorphous alloy strip are provided with lines at the area of more than or equal to 95%, and the line interval is 1.5-4.0 mm.
Preferably, the distance between adjacent wave crests and wave troughs of the roll-facing surface corrugation of the iron-based amorphous alloy strip in the width direction of the strip is 1.0-2.5 mm.
Preferably, the distance between adjacent wave crests and wave troughs of the free surface corrugations of the iron-based amorphous alloy strip in the width direction of the strip is 0.5-2.0 mm.
Preferably, the components of the iron-based amorphous alloy strip are shown as the formula (I),
FeaSibBcCdMf (Ⅰ)；
wherein M is a microelement and an inevitable impurity element, and according to atomic percentage, a is more than or equal to 79 and less than or equal to 85.0, b is more than or equal to 0 and less than or equal to 10, c is more than or equal to 9 and less than or equal to 16, d is more than or equal to 0.01, and f is less than or equal to 0.4.
The application also provides a preparation method of the iron-based amorphous alloy strip, which comprises the following steps:
spraying molten iron-based amorphous alloy molten steel in a molten state on a cooling roller through a strip spraying nozzle to be rapidly cooled to obtain an iron-based amorphous alloy strip;
the strip spraying nozzle comprises a strip spraying opening arranged in the center, an oxygen supplementing opening arranged at the periphery of the strip spraying opening and a combustible gas spraying opening arranged at the periphery of the oxygen supplementing opening;
a plurality of annular flame spraying devices are arranged in the 360-degree direction of the belt spraying nozzle;
a first grinding wheel, a gas cooling injection device and a second grinding wheel are arranged in the rotating direction of the cooling roller; the first grinding wheel is used for turning, rough grinding and secondary accurate grinding of the cooling roller, and the second grinding wheel is used for accurate grinding of the cooling roller.
Preferably, the roller surface temperature of the cooling roller is 80-100 ℃, and the smoothness of the cooling roller is 0.05-0.1 μm.
Preferably, the temperature difference between the middle temperature of the spray belt nozzle and the two sides of the spray belt nozzle is not more than 10 ℃.
The application also provides a single-roller rapid quenching device for the iron-based amorphous alloy strip, which comprises a strip spraying nozzle and a cooling roller, and is characterized in that the strip spraying nozzle comprises a strip spraying port arranged in the center, an oxygen supplementing port arranged at the periphery of the strip spraying port and a combustible gas jet orifice arranged at the periphery of the oxygen supplementing port;
a plurality of annular flame throwers are arranged in the 360-degree direction of the ribbon spraying nozzle;
a first grinding wheel, a gas cooling injection device and a second grinding wheel are arranged in the rotating direction of the cooling roller; the first grinding wheel is used for turning, rough grinding and secondary accurate grinding of the cooling roller, and the second grinding wheel is used for accurate grinding of the cooling roller.
Preferably, the width of the first grinding wheel is 5-10% narrower than that of the iron-based amorphous alloy strip; the width of the second grinding wheel is 5-10% wider than that of the iron-based amorphous alloy strip.
Preferably, the gas cooling injection device is disposed between the first grinding wheel and the second grinding wheel.
The application provides an iron-based amorphous alloy strip with continuous and stable grains; the roller-attaching surface and the free surface of the iron-based amorphous alloy strip are provided with lines at the area of more than or equal to 95%, and the line interval is 1.5-4.0 mm.
The application also provides a preparation method of the iron-based amorphous alloy strip, which comprises the steps of spraying molten iron-based amorphous alloy steel in a molten state onto a cooling roller through a strip spraying nozzle to be rapidly cooled, and obtaining the iron-based amorphous alloy strip; in the preparation process, the temperature of the strip spraying nozzle is stably and uniformly controlled by arranging the flaming device around the strip spraying nozzle, the stability of the gas atmosphere around the weld puddle is realized by comprehensively adjusting the double seams of the strip spraying nozzle, the consistency of the state that the cooling roller enters the weld puddle is realized by the gas circulation jet cooling device, the integral preparation environment is highly consistent by the means, so that the preparation condition that the strip is continuously and stably prepared is reached, and meanwhile, the iron-based amorphous alloy strip is uniformly, stably and continuously prepared by a single-roller rapid quenching method through the grinding of the roughness of the cooling roller.
Drawings
FIG. 1 is a schematic view of a single-roller rapid quenching device for an iron-based amorphous alloy strip of the invention;
FIG. 2 is a structural diagram of a single-roller rapid quenching nozzle for an iron-based amorphous alloy strip of the invention;
FIG. 3 is a schematic diagram showing the lines of an iron-based amorphous alloy strip prepared by using the single-roller rapid quenching device of the invention;
FIG. 4 is a schematic diagram of the texture of a high-quality Fe-based amorphous alloy strip prepared by a conventional device;
fig. 5 is a schematic diagram of the texture of the iron-based amorphous alloy strip prepared under the conventional equipment condition without control.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Aiming at the problems that the grain of the iron-based amorphous alloy strip is not uniform and the stability is poor in the prior art, and the performance of the iron-based amorphous alloy strip is finally influenced, the application provides the iron-based amorphous alloy strip which has continuous and stable grains; further, the grain areas of the roller surface and the free surface of the iron-based amorphous alloy strip are more than or equal to 95%, the grain intervals are 1.5-4.0 mm, more specifically, the grain areas of the roller surface and the free surface are 96-99%, and the grain intervals are 1.9-2.1 mm.
Further, the distance between adjacent wave crests and wave troughs of the roll-attaching surface corrugations of the iron-based amorphous alloy strip is 1.0-2.5 mm in the width direction of the strip, and the distance between adjacent wave crests and wave troughs of the free surface corrugations of the iron-based amorphous alloy strip is 0.5-2.0 mm in the width direction.
The invention also provides a preparation method for obtaining continuous and stable grains of the iron-based amorphous alloy strip, which comprises the following steps:
spraying molten iron-based amorphous alloy molten steel in a molten state on a cooling roller through a strip spraying nozzle to be rapidly cooled to obtain an iron-based amorphous alloy strip;
the strip spraying nozzle comprises a strip spraying opening arranged in the center, an oxygen supplementing opening arranged at the periphery of the strip spraying opening and a combustible gas spraying opening arranged at the periphery of the oxygen supplementing opening;
an annular flame spray head is arranged in the 360-degree direction of the flame spray belt nozzle;
a first grinding wheel, a gas cooling injection device and a second grinding wheel are arranged in the rotating direction of the cooling roller, and the gas cooling injection device is arranged between the first grinding wheel and the second grinding wheel; the first grinding wheel is used for turning, rough grinding and secondary accurate grinding of the cooling roller, and the second grinding wheel is used for accurate grinding of the cooling roller.
In the application, the iron-based amorphous strip comprises the following chemical components in atomic percentage: feaSibBcCdMf(ii) a Wherein M is a trace element and an inevitable impurity element, wherein the atomic ratio contents of a, b, c, d and f are respectively as follows: a is more than or equal to 79 and less than or equal to 85.0, b is more than or equal to 0 and less than or equal to 10, c is more than or equal to 9 and less than or equal to 16, d is more than or equal to 0.01, and the rest is f: f is less than or equal to 0.4; more specifically, the mass content of P in M is controlled to be 0.01-0.03%, the mass content of Mn element is controlled to be 0.03-0.20%, and the mass content of Al element is controlled to be less than 0.0025%.
The amorphous alloy strip has stable and continuous grains, and mainly aims at the iron-based amorphous alloy with the above component proportion, namely the specific components of the iron-based amorphous alloy in the embodiment meet the proportion.
The iron-based amorphous strip is prepared by spraying molten steel in a molten state onto a cooling roller for quick cooling, and the technology is called as a single-roller quick crushing method. The process piece for spraying the molten steel is called a strip spraying nozzle, and the material of the strip spraying nozzle has good thermal conductivity, thermal uniformity, thermal shock resistance, high strength and scouring resistance; simultaneously, the preparation environment around the area is spouted in stable accurate control, increases external control facility and goes on, wherein includes: a, treating the surface of a cooling roller, namely, adopting a composite coping device, effectively and stably controlling the surface smoothness of the cooling roller to be 0.05-0.1 mu m, simultaneously removing an oxidation fatigue layer on the surface of the cooling roller, which is generated by steel hydrothermal impact, and simultaneously cleaning foreign matters attached to the surface of the cooling roller, so as to prevent the foreign matters from entering a weld puddle along with the cooling roller, and further prevent the adverse effects on the strip making time and the strip quality; b, a roll surface temperature control device can accurately and stably control the surface temperature of the cooling roll, and the roll surface temperature is controlled to be 80-100 ℃, so that the roll surface temperature before entering the weld puddle is stably kept consistent; and c, the surrounding atmosphere control device of the strip nozzle can control the oxygen concentration around the weld puddle and further control the influence caused by viscosity change due to molten steel oxidation.
Namely: the invention adopts a method for optimizing the preparation process to stably control the generation and the fluctuation of the grain of the iron-based amorphous strip, comprises the control of the preparation atmosphere and the surface quality of a cooling roller, and realizes that the grain of the roll surface of the strip and the grain of the free surface can reach more than 95 percent by simultaneously and stably controlling the preparation atmosphere and the surface quality of the cooling roller within a controllable range, thereby further reducing the fluctuation range of the performance of the strip and ensuring that the prepared strip is produced with the optimal performance and the maximum quantity. The two modes are specifically as follows:
first-to stabilize the process atmosphere, including the thermal uniformity of the ribbon nozzle, the oxygen concentration near the puddle, and the surface temperature of the chill roll before it enters the puddle, under existing flow structures.
The non-uniformity of the nozzle temperature is mainly shown in that the temperatures of two sides of the nozzle at the exposed part are 100-200 ℃ lower than the temperature of the middle part, and the main reason of the phenomenon is that the heat dissipation surfaces at two ends of the nozzle are provided with four surfaces, namely a front surface, a back surface, an end surface and a cooling surface, and the heat dissipation surface at the middle part is three surfaces, so that the heat dissipation of one end surface is reduced. Therefore, in order to make up the non-uniform temperature of the nozzle caused by the heat loss of the end face heat dissipation, a plurality of flame spraying heating devices are additionally arranged at the position of one circle of the whole nozzle, the size, the length and the temperature of flame can be stably controlled according to corresponding flow control devices, and each flame spraying head is controlled by an independent switch, so that the size of the nozzle can be adjusted according to the actual condition no matter the two sections of positions or the middle position of the nozzle, the purpose of compensating the end face heat loss is achieved, and meanwhile, the overall temperature and the stability of the nozzle can be improved. Experimental data show that the overall temperature of the nozzle heated by the device can be about 1300 ℃, and the temperature difference between the two ends and the middle can be stabilized within 10 ℃.
Meanwhile, for the amorphous component, the higher the oxygen concentration dissolved in the molten steel is, the higher the viscosity of the molten steel is, the smaller the surface tension is, the longer the molten steel fluidity is, the lower the fluidity is, the longer the preparation time and the yield of the molten steel can be greatly reduced, and the smaller the surface tension is, the less the production of strip lines is, so that the surface temperature of the cooling roll surface is further controlled while the oxygen concentration around the weld pool is controlled, and the change of the position of the solid-liquid phase line of the molten metal in the amorphous forming area is controlled by the change of the surface temperature of the roll surface, thereby achieving the purpose of controlling the line state. Therefore, the combustible gas jet ports are increased around the strip-spraying nozzle by controlling the oxygen concentration around the weld puddle, the oxygen supplement ports are increased around the next-door neighbour strip-spraying nozzle, the combustible gas flow and the oxygen supplement amount are further adjusted by observing the quantity and the form of bubbles on the surface of the strip and the apparent mass of the strip, and the control of the oxygen concentration around the weld puddle is realized by double-seam arrangement of the strip-spraying nozzle. The structural schematic diagram of the strip spraying nozzle is shown in fig. 2, the annular gas seams of the whole strip spraying nozzle are arranged, the outermost side is a combustible gas jet orifice which can consume oxygen around the weld puddle and can be combusted through an inner oxygen supplement port, and the middle is a strip spraying port.
Roll face temperature control is also critical to the strip texture. In the normal amorphous preparation process, the temperature of the roller surface can reach 100-300 ℃ through measurement and display of an infrared thermometer, the whole roller surface of the cooling roller is blown through a gas circulation jet cooling device, the surface temperature of the cooling roller can be reduced to 80-100 ℃, and the device can realize stable control of the temperature of the roller surface of the cooling roller by adjusting the flow rate of gas flow, so that the surface temperature of the cooling roller entering a weld puddle can be ensured to be highly consistent in the whole preparation period.
Therefore, the temperature of the strip spraying nozzle is stably and uniformly controlled by the external flaming device, the stability of the gas atmosphere around the weld puddle is realized by comprehensively adjusting the double seams of the strip spraying nozzle, and the cooling roller enters the weld puddle through the gas circulation jet cooling device, so that the overall preparation environment is highly consistent by the arrangement of the related devices, and the preparation condition that the strip is continuously and stably prepared is achieved.
The surface quality control of the cooling roller can also influence the surface quality of the amorphous alloy strip, and in the application, the surface quality of the cooling roller mainly refers to the surface smoothness, namely the roughness, of the cooling roller. The roughness of the surface of the cooling roller is controlled by a grinding wheel rotating at high speed.
The first grinding wheel mainly has the functions of turning, rough grinding and secondary accurate grinding; after the cooling roller is turned, a low-mesh grinding wheel is used for carrying out rough grinding, the roughness after rough grinding is controlled to be 0.2-0.4 mu m, then the small-mesh grinding wheel is replaced for carrying out secondary fine grinding, after the secondary fine grinding is finished, the roughness is controlled to be 0.10-0.15 mu m, the width of the first grinding wheel is selected according to the actually prepared bandwidth, the width of the first grinding wheel is 5-10% narrower than the bandwidth, reciprocating walking is carried out at the position where the bandwidth cannot be reached, reciprocating movement is carried out on the secondary fine grinding, the whole cooling roller surface is prevented from being damaged while a certain grinding effect is guaranteed, and the subsequent treatment difficulty is increased.
Meanwhile, the gas circulation cooling device is preferably arranged between the first grinding wheel and the second grinding wheel, so that the surface of the roller can be rapidly and uniformly cooled, and preparation is made for the processing condition of the second grinding wheel. The second grinding wheel has the main function of fine grinding, which is the roughness really used by the cooling roller in the actual preparation process, and can grind with large area and high efficiency by polishing at a fixed position of the second grinding wheel, thereby avoiding the uneven state caused by the similarity to the first grinding wheel; the width of the second grinding wheel is selected according to the actually prepared bandwidth, the second grinding wheel is 5-10% wider than the bandwidth, the grinding position is fixed, the whole spray belt position is within the grinding range of the second grinding wheel, grinding wheels with smaller meshes are used, and the finish degree of fine grinding treatment is controlled to be 0.05-0.1 mu m.
In conclusion, the main factors (preparation conditions, preparation environment, preparation atmosphere and the like) for generating the grains of the iron-based amorphous strip prepared by the single-roller rapid quenching method are stably controlled, so that the generated grains are stably, continuously and uniformly generated.
In conclusion, the invention optimizes the preparation process of the iron-based amorphous alloy strip, so that the grains of the iron-based amorphous alloy strip can stably and continuously appear, the performance fluctuation is solved, the performance of the strip with qualified other indexes in the whole strip making period is maintained in a controllable and stable interval range, and the yield is further improved. Experimental results show that the amorphous strip prepared by the process has the advantages that the areas with the lines on the roller surface and the free surface of the strip can reach more than 95%, the line spacing is stabilized between 2.0 +/-0.1 mm, the lines are continuous and regular, no obvious interruption exists, and the apparent quality and the lines of the strip are obviously superior to those of the strip prepared by a conventional method. The loss of the annealed strip is less than or equal to 0.06W/kg under the conditions of magnetic density of 1.30T and 50Hz, the performance can be controlled within 0.062W/kg even in the later preparation stage, the fluctuation range is stabilized within +/-0.002, and the excitation power is less than or equal to 0.12VA/kg, so that the expectation of further stably controlling the performance of the strip by stably controlling the appearance of strip grains is realized.
The application also provides a single-roller rapid quenching device for the iron-based amorphous alloy strip, which is shown in a specific structural schematic diagram of fig. 1, and more specifically, the single-roller rapid quenching device comprises a strip spraying nozzle and a cooling roller, wherein the strip spraying nozzle comprises a strip spraying port arranged in the center, an oxygen supplementing port arranged at the periphery of the strip spraying port and a combustible gas spraying port arranged at the periphery of the oxygen supplementing port;
an annular flame spray head is arranged in the 360-degree direction of the flame spray belt nozzle;
a first grinding wheel, a gas cooling injection device and a second grinding wheel are arranged in the rotating direction of the cooling roller; the first grinding wheel is used for turning, rough grinding and secondary accurate grinding of the cooling roller, and the second grinding wheel is used for accurate grinding of the cooling roller.
In the present application, the annular flame spray head, the first grinding wheel, the second grinding wheel and the gas cooling and spraying device arranged around the nozzle strip nozzle are all devices in the prior art, and the present application does not have any particular limitation on the specific internal structure and the related principle thereof.
For further understanding of the present invention, the following detailed description of the fe-based amorphous alloy ribbon according to the present invention is provided in conjunction with the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
According to atomic percentage, the chemical component is FeaSibBcCdMfThe molten steel in the molten state of the iron-based amorphous alloy is sprayed on a cooling roller by a spray nozzle to be rapidly cooled by adopting different process conditions, namely the molten steel in the molten state is rapidly quenched by a single roller to obtain an iron-based amorphous alloy strip with the width specification of 142mm and the thickness of 27 mu m; wherein the process condition 1 is the process condition of the embodiment of the invention, and the process condition 2 is the conventional process condition;
the process conditions are as follows: in the single-roller rapid quenching process, a strip-spraying nozzle annular fire-spraying head is arranged in a 360-degree range of the strip-spraying nozzle, the strip-spraying nozzle is subjected to overall temperature control, and each fire-spraying head is provided with an independent switch; meanwhile, the strip spraying nozzles are arranged in an annular gas gap, the outermost side is a combustible gas spraying opening which can consume oxygen around the weld pool and can also burn through an inner oxygen supplement opening, and the middle is a strip spraying opening;
on the other hand, a first grinding wheel, a gas circulation cooling device and a second grinding wheel are arranged in the rotating direction of the cooling roller, the smoothness of the cooling roller is 0.1-0.15 μm after passing through the first grinding wheel, and the smoothness of the cooling roller is 0.05-0.10 μm after passing through the second grinding wheel.
The process conditions 2 are as follows:
in the single-roller rapid quenching process, a conventional nozzle is adopted for manufacturing the strip, and the structure of the conventional nozzle is parallel double-slit: the gas jet nozzle comprises a jet seam and a gas seam, wherein the jet seam is a jet belt opening, and the gas seam is a combustible gas jet orifice; and after the grinding wheel is arranged in the rotating direction of the cooling roller and is treated by the grinding wheel, the smooth finish of the cooling roller is 0.1-0.15 mu m.
1) Grain comparison
Fig. 3 is an amorphous strip prepared under the process condition 1 with the preparation process environment controlled, the left side showing the texture of the free surface strip and the right side showing the texture of the roll surface strip; as can be seen from fig. 3, the overall strip has complete grains and can be stably produced, and about 95% of the grains adhered to the roll surface penetrate through the entire strip surface continuously and uniformly; the free surface lines are all generated, the lines are clear, no obvious drawing and discontinuous phenomena exist, and the appearance of the whole strip material is flawless.
Fig. 4 and 5 show the amorphous strip prepared under process condition 2. Wherein fig. 4 is a case of good texture quality: the whole grain of the free surface of the strip is good, but grains on two sides are slightly shallow compared with grains in the middle, the phenomenon that the grains in the middle are poor and the grains on two sides are good sometimes exists, the grains are the same type of grains, only 80% of the middle of the surface of the pasting roll can penetrate through the grains, and the grains on two sides cannot penetrate through the shallow places.
Fig. 5 shows the case of poor texture quality: the strip line does not have obvious regularity, and the line interval is not standard, and the line does not have obvious common characteristic simultaneously, and the line bending degree is higher, and the roller surface of pasting sees through the condition more uncontrollable, sees through at random, and is mixed and disorderly. As can be seen from fig. 4 and 5, the surface texture quality of the amorphous strip prepared under the conventional process condition is unstable, and is far from the surface quality of the amorphous strip prepared by the process method of the present invention.
2) Data comparison
Table 1 and table 2 list the excitation power and the core loss of the strip prepared under different process conditions. Wherein the different sample numbers represent samples sprayed at different times under different preparation process conditions, the roller surface smoothness (surface protrusion height) is an actual measured value before casting, the roller surface temperature is an average value of actual temperature measurement data of the roller surface in the whole preparation time range, and the nozzle temperature is an average value of actual temperature measurement data of a spray nozzle in the whole preparation time range; the excitation power and the iron core loss are tested under the condition of 50Hz \ 1.30T. Table 1 shows the process conditions 1 according to the invention, and table 2 shows the process conditions 2, i.e. the conventional process conditions.
TABLE 1 amorphous strip Properties and data tables of various concerns prepared in this application
TABLE 2 data sheet of properties and data of various points of interest of amorphous strip prepared under conventional preparation conditions
The data in Table 1 show that the actual measured data of the amorphous strip produced under the process condition of the invention show that the smoothness of the roller surface of the cooling roller using the process of the invention can be stably controlled below 0.09 mu m, the temperature of the roller surface is within 100 ℃, the temperature difference between the middle and two sides of a strip spraying nozzle is basically controlled within 10 ℃, the average temperature of the whole nozzle is above 1300 ℃ on the whole strip spraying time, and the stability and the controllability are obviously superior to those of the conventional process. Meanwhile, stable grains are generated, the stability of the performance of the product can be still ensured, and the advantage of the performance is about 15% better than that of the conventional component; the excitation is 13% better than the preparation method of the conventional process.
The data in table 2 are conventional preparation process experiments, and the roughness of the roll surface finish degree and the roll surface temperature have a certain inverse proportion relation through the data, the statistical data average value of the roll surface temperature measuring device and the statistical data average value of the nozzle temperature, meanwhile, the temperatures on two sides of the nozzle and the middle temperature have no regularity and stability, the middle temperature is higher than the temperatures on two sides by about 100-200 ℃, the average temperature of the whole nozzle is 1200-1300 ℃, the volatility is high, and the instability of the preparation process also brings difference and instability of basic performance of the strip.
The data show that the amorphous strip prepared under the stable and accurate control preparation condition can stably and continuously obtain the strip lines, the basic performance of the strip is greatly improved, and the strip yield, the product quality and the basic performance are obviously superior to those of the conventional preparation process.
Example 2
In order to verify the influence of the method on the lines, a cross experiment method is adopted to carry out further experimental verification.
According to atomic percentage, the chemical component is FeaSibBcCdMfThe molten steel in the molten state of the iron-based amorphous alloy is sprayed on a cooling roller through a strip spraying nozzle to be rapidly cooled to obtain an iron-based amorphous alloy strip with the width specification of 142mm and the thickness of 27 mu m. The specific process conditions are as follows:
experiment 1: the technical scheme of the invention is completely adopted: the annular flame-throwing heads with the spray belt nozzles are arranged in the range of 360 degrees containing the spray belt nozzles, the temperature of the spray belt nozzles is comprehensively controlled, and each flame-throwing head is provided with an independent switch; meanwhile, the strip spraying nozzles are arranged in an annular gas gap, the outermost side is a combustible gas spraying opening which can consume oxygen around the weld pool and can also burn through an inner oxygen supplement opening, and the middle is a strip spraying opening; comprises a No. 1 grinding wheel and a No. 2 grinding wheel and comprises a gas cooling injection device;
experiment 2: under the condition of experiment 1, the nozzle is replaced by a conventional nozzle, namely, the nozzle has a parallel double-slit structure, namely, a spray belt opening and an air slit;
experiment 3: under the condition of experiment 1, the grinding mechanism is replaced by a common grinding mechanism, namely, the grinding mechanism only comprises a 1 st grinding wheel, but does not comprise a 2 nd grinding wheel and a gas cooling and spraying device;
experiment 4: under the conditions of experiment 1, the gas cooling injection device was removed;
experiment 5: the conventional preparation technology comprises the following steps: using a conventional nozzle: a parallel double slit nozzle; conventional coping mechanism: only the first grinding wheel is included;
measuring and analyzing various characteristics of the lines by taking a strip with the length of at least 1m under each experimental condition to obtain data in unit mm as shown in a table 3;
TABLE 3 texture comparison data table of Fe-based amorphous alloy strip under different process conditions
As can be seen from the above table, the above optimization approaches of the present invention are mutually complementary, and any lack thereof may cause discontinuity of the texture.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An iron-based amorphous alloy strip having continuous and stable grains; the roller-attaching surface and the free surface of the iron-based amorphous alloy strip are provided with lines at the area of more than or equal to 95%, and the line interval is 1.5-4.0 mm.
2. The iron-based amorphous alloy strip of claim 1, wherein the roll-facing surface corrugation adjacent peaks and valleys of the iron-based amorphous alloy strip are spaced by 1.0mm to 2.5mm in the width direction of the strip.
3. The Fe-based amorphous alloy strip according to claim 1, wherein the distance between adjacent peaks and troughs of the free surface corrugation of the Fe-based amorphous alloy strip in the width direction of the strip is 0.5-2.0 mm.
4. The Fe-based amorphous alloy strip according to claim 1, wherein the Fe-based amorphous alloy strip has a composition represented by formula (I),
FeaSibBcCdMf (Ⅰ)；
wherein M is a microelement and an inevitable impurity element, and according to atomic percentage, a is more than or equal to 79 and less than or equal to 85.0, b is more than or equal to 0 and less than or equal to 10, c is more than or equal to 9 and less than or equal to 16, d is more than or equal to 0.01, and f is less than or equal to 0.4.
5. The method for preparing the iron-based amorphous alloy strip of claim 1, comprising the steps of:
spraying molten iron-based amorphous alloy molten steel in a molten state on a cooling roller through a strip spraying nozzle to be rapidly cooled to obtain an iron-based amorphous alloy strip;
the strip spraying nozzle comprises a strip spraying opening arranged in the center, an oxygen supplementing opening arranged at the periphery of the strip spraying opening and a combustible gas spraying opening arranged at the periphery of the oxygen supplementing opening;
a plurality of annular flame spraying devices are arranged in the 360-degree direction of the belt spraying nozzle;
a first grinding wheel, a gas cooling injection device and a second grinding wheel are arranged in the rotating direction of the cooling roller; the first grinding wheel is used for turning, rough grinding and secondary accurate grinding of the cooling roller, and the second grinding wheel is used for accurate grinding of the cooling roller.
6. The method of claim 5, wherein the cooling roll has a roll surface temperature of 80 to 100 ℃ and a finish of 0.05 to 0.1 μm.
7. The method of claim 5, wherein the temperature difference between the middle temperature of the belt nozzle and the two sides of the belt nozzle is not more than 10 ℃.
8. The single-roller rapid quenching device for the iron-based amorphous alloy strip comprises a strip spraying nozzle and a cooling roller, and is characterized in that the strip spraying nozzle comprises a strip spraying port arranged in the center, an oxygen supplementing port arranged on the periphery of the strip spraying port and a combustible gas jet orifice arranged on the periphery of the oxygen supplementing port;
a plurality of annular flame throwers are arranged in the 360-degree direction of the ribbon spraying nozzle;
a first grinding wheel, a gas cooling injection device and a second grinding wheel are arranged in the rotating direction of the cooling roller; the first grinding wheel is used for turning, rough grinding and secondary accurate grinding of the cooling roller, and the second grinding wheel is used for accurate grinding of the cooling roller.
9. The single-roller rapid quenching device of claim 8, wherein the width of the first grinding wheel is 5-10% narrower than that of the iron-based amorphous alloy strip; the width of the second grinding wheel is 5-10% wider than that of the iron-based amorphous alloy strip.
10. The single-roll rapid quenching device according to claim 8, wherein the gas cooling injection device is disposed between the first grinding wheel and the second grinding wheel.
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