Cobalt-based amorphous strip with high thermal stability and high toughness and preparation method thereof

Abstract

The invention relates to the technical field of functional metal materials and soft magnetic materials, in particular to a high-thermal-stability and high-toughness cobalt-based amorphous strip and a preparation method thereof.The cobalt-based amorphous strip comprises Co, Fe, Ni, B, P, Si, C, Mo, Ta, Nd, Y and Ce with the limited atomic percent, and the sum of the content of Mo, the content of Ta and the content of Nd is limited to be 1.8 at%-2.55 at%; the sum of the contents of B, P, Si and C is 17 at%-20.5 at%; the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.08-0.155; the ratio of the content of Y to the sum of the contents of Y and Ce is greater than or equal to 0.7. The components of the cobalt-based amorphous strip are scientifically designed, and annealing and edge and surface optimization treatment during preparation are combined, so that the thermal stability, toughness, environmental reliability and other performance of the cobalt-based amorphous strip are remarkably improved, and the application field of the cobalt-based amorphous strip is expanded.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of functional metal materials and soft magnetic materials, and in particular to a cobalt-based amorphous ribbon with high thermal stability and high toughness and a preparation method thereof. BACKGROUND

[0002] Amorphous alloy ribbon has a series of excellent soft magnetic properties due to its "no long-range ordered atomic structure": low coercivity, high resistivity, low magnetostriction coefficient, excellent high-frequency response capability, etc. Therefore, in the fields of high-frequency transformers, inductors, wireless charging, 5G communication filters, EMI suppressors, etc. that require low loss, high frequency, and fast response magnetic performance, amorphous ribbon has become an important basic material.

[0003] Cobalt-based amorphous alloy ribbon has attracted attention due to its unique performance advantages. Compared with typical iron-based amorphous alloys, cobalt-based systems generally have lower magnetostriction coefficients, lower coercivity, higher permeability, lower loss, and better temperature and frequency stability. Therefore, in high-frequency, low-noise, low-loss magnetic core components, cobalt-based amorphous ribbon has a significant advantage.

[0004] However, the current cobalt-based amorphous ribbon has problems of insufficient thermal stability and toughness, such as easy partial crystallization or structural evolution in high-temperature or long-time annealing, thermal cycling environment, resulting in a decrease in soft magnetic properties, such as cracks or cracks when winding or forming with a small bending radius, limiting its application in miniaturized devices. In addition, its environmental reliability needs to be improved, and cobalt-based amorphous ribbon is prone to magnetic performance drift, increased magnetic loss, and reduced service life under high temperature and high humidity conditions. The above problems make it difficult for the existing cobalt-based amorphous ribbon to meet the use requirements of high-end devices.

[0005] Therefore, how to optimize the composition of cobalt-based amorphous ribbon or / and the preparation method of cobalt-based amorphous ribbon to overcome the above defects is a technical problem that needs to be solved at present. SUMMARY

[0006] In view of the background art, the present application provides a cobalt-based amorphous ribbon with high thermal stability and high toughness and a preparation method thereof, aiming to solve the problem of poor thermal stability, toughness and environmental reliability in the prior art, which cannot meet the use requirements.

[0007] In order to achieve the above purpose, the main technical solutions adopted by the present application are as follows.

[0008] In one aspect, the present application provides a cobalt-based amorphous strip with high thermal stability and high toughness, comprising the following components: Co 66at%-73at%, Fe 3.5at%-8at%, Ni 1.5at%-5at%, B 11.5at%-14.5at%, P 2.5at%-5.5at%, Si 1.5at%-4.5at%, C 0.1at%-0.35at%, Mo 1at%-2at%, Ta 0.4at%-1at%, Nd 0.18at%-0.5at%, Y 0.25at%-0.9at%, Ce 0-0.3at%, the sum of the contents of each component being 100at%; meanwhile, the content of each component also satisfies the following relationship: Relationship one: the sum of the contents of Mo, Ta and Nd is 1.8at%-2.55at%; Relationship two: the sum of the contents of B, P, Si and C is 17at%-20.5at%; Relationship three: the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.08-0.155; Relationship four: the ratio of the content of Y to the sum of the contents of Y and Ce is ≥0.7.

[0009] In the cobalt-based amorphous strip provided by the present application: (1) Co, Fe and Ni are main metal elements, and the addition of a small amount of Ni can adjust the 3d electron concentration, which helps to reduce the magnetostriction coefficient and increase the resistivity, thereby improving the soft magnetic properties and reducing the magnetic loss; the present application finds that when the ratio of the sum of the contents of Fe and Ni to the content of Co satisfies relationship three, the saturation magnetic induction intensity Bs can be moderately improved while keeping the low magnetostriction characteristic of the cobalt-based amorphous strip; if the ratio is lower than 0.08, the Bs may not meet the standard, and if the ratio is higher than 0.155, the low magnetostriction characteristic of the cobalt-based amorphous strip will be sacrificed, leading to an increase in high-frequency loss and noise, which deviates from the original intention of using high-cobalt design; (2) B, P, Si, C are glass-forming elements, which are the framework of amorphous structure, wherein B, P, Si account for a large proportion, B fills in between metal atoms by virtue of its small atomic size, increases the atomic stacking density and disorder degree, thereby inhibiting crystallization, Si optimizes the viscosity of the melt, P and B synergistically enhance the chemical short-range order, and the addition of trace C further improves the amorphous forming ability and also enhances the toughness of the strip under the condition of notch sensitivity; it is found that when the content of B, P, Si, C is less than 17at%, the framework of amorphous structure is incomplete, the amorphous forming ability is weak, and the strip is easy to crystallize during preparation or annealing, resulting in brittleness of the strip and degradation of magnetic properties, and when the content of B, P, Si, C is higher than 20.5at%, the framework of amorphous structure is too rigid, which can cause excessive brittleness of the strip, and the bending life is greatly reduced, and the magnetic atom concentration is also excessively diluted, resulting in a decrease in the saturation magnetic induction Bs, therefore, when the content of B, P, Si, C satisfies the relationship formula two, the amorphous structure of the strip is obvious and the mechanical properties are good; (3) Mo, Ta, Nd are synergistic modification elements, which can greatly increase the disorder degree of atomic stacking, the synergistic effect of Mo, Ta, Nd can improve the crystallization activation energy, thereby improving the thermal stability, for example, when the total amount of the three is less than 1.8at%, the improvement effect on the thermal stability is not obvious, and when the total amount of the three is higher than 2.55at%, brittle phases are easily formed, which is not conducive to the uniformity and toughness of the amorphous structure, therefore, the total amount of the three satisfies the relationship formula one, which is helpful to obtain a wide undercooling liquid phase region; Y and Ce are purifying agents, and the two are mainly added for deoxidization, desulfurization and stabilization of the matrix, and further improve the environmental reliability; since Y has better purification effect, when the two are added together, the proportion of Y is not less than 70%, which is helpful to obtain better purification effect, otherwise, the high proportion of Ce will lead to poor purification effect, resulting in poor corrosion resistance of the amorphous strip, and the magnetic property drift in high temperature and high humidity test is not up to standard, therefore, the addition amount of Y and Ce should satisfy the relationship formula four.

[0010] In summary, through the above component proportion and relationship formula constraint design, the components in the cobalt-based amorphous strip proposed by the application can maximize the synergistic effect, and significantly improve the thermal stability, toughness, environmental reliability and soft magnetic properties of the product.

[0011] Further, the thickness is 20-28 μm, preferably 22-25 μm, the transverse thickness fluctuation is ≤±5%, the surface roughness Ra is ≤0.20 μm, and the pinhole density is ≤0.3 per cm 2 .

[0012] Further, the undercooling liquid phase region ΔTx is ≥120℃; under the condition of a radius of 0.5 mm, the 180° bending life is ≥180 times.

[0013] Further, the performance drift is less than or equal to 3.2% under the condition of 85 DEG C / 85%RH for 168 hours.

[0014] Further, the coercivity Hc is less than or equal to 2.2 A / m, the saturation magnetic induction Bs is greater than or equal to 0.93 T, the resistivity p is greater than or equal to 137 mu Omega cm, the magnetostriction coefficient |lambda s| is less than or equal to 1.3 ppm, and the magnetic loss is less than or equal to 68 mW / cm under the condition of 100 kHz and Delta B=0.1 T. 3 .

[0015] In another aspect, the application further provides a preparation method of the cobalt-based amorphous ribbon with high thermal stability and high toughness, comprising the following steps: S1, smelting and purification; S2, ribbon forming; S3, two-stage tension annealing: the annealing temperature of stage I is 300-310 DEG C, the annealing time is 3-5 min, and the tension applied is 30-40 MPa; the annealing temperature of stage II is 280-290 DEG C, the annealing time is 2-3 min, and the tension applied is 10-15 MPa; after the completion of stage II, the tension is removed when the temperature is reduced to below 200 DEG C, and the transverse temperature difference is not greater than 5 DEG C; S4, edge and surface optimization; S5, quality inspection.

[0016] The prior art usually adopts single-stage annealing or annealing in an inert atmosphere to release residual stress and optimize structure. However, the single annealing process is usually difficult to completely eliminate the residual stress in the manufacturing process, resulting in the problem of stress residue. Therefore, it is difficult to achieve the effects of significantly reducing magnetic loss, improving toughness and environmental reliability.

[0017] On the basis of the specific component design, the application introduces two-stage tension annealing: the annealing temperature of stage I is 300-310 DEG C, the annealing time is 3-5 min, and the tension applied is 30-40 MPa, which is mainly used for quickly releasing manufacturing residual stress and preliminarily stabilizing structure; the annealing temperature of stage II is 280-290 DEG C, the annealing time is 2-3 min, and the tension applied is 10-15 MPa, which is used for further optimizing magnetic domain structure on the basis of stage I, improving the toughness and soft magnetic properties of the cobalt-based amorphous ribbon, and ensuring that the cobalt-based amorphous ribbon has low coercivity and high mechanical toughness. Through simple and easy-to-implement operation, the two-stage tension annealing can more effectively release the residual stress in the manufacturing process, optimize the magnetic domain structure, and simultaneously consider the mechanical formability and magnetic loss of the ribbon, effectively solving the problem of stress residue in the traditional single-stage annealing or annealing in an inert atmosphere. The improvement effects of the product on magnetic loss, toughness and environmental reliability are more obvious.

[0018] Further, when the two-stage tension annealing is performed, the heating rate of the annealing temperature is not higher than 50℃ / min, so as to avoid local structure unevenness caused by too fast heating, and to avoid crystallization or internal stress concentration, or to avoid deformation or even cracking of the strip due to thermal expansion difference.

[0019] Further, the step S1 is specifically operated as follows: each raw material is put into a vacuum induction melting furnace for melting, and the background pressure of the cavity before melting is not greater than 5*10 -2 Pa, and high-purity argon is filled for protection to prevent secondary oxidation. During the melting, 0.02wt%-0.03wt% of Mg and 0.01wt%-0.02wt% of Ca corresponding to the total mass of the raw materials are added for purification, and the oxygen content is strictly controlled to be less than or equal to 30ppm, and the sulfur content is strictly controlled to be less than or equal to 10ppm, so as to avoid the influence of impurities on the performance of the amorphous strip. It should be noted that the purity of each raw material is greater than or equal to 99.9wt%, and after multiple melting by the vacuum induction melting, vacuum arc remelting can be further used for refining. The step S2 is specifically operated as follows: a single roller rapid cooling method is used, the wheel speed is 30-34m / s, the nozzle-roller gap is 80-100μm, the wheel speed and the nozzle-roller gap are matched to ensure the uniformity of the thickness of the strip, the transverse thickness fluctuation is less than or equal to ±5%, and the cooling rate is controlled to be 10 4 -10 6 K / s to ensure the formation of the amorphous structure. The step S4 is specifically operated as follows: first, laser trimming is used to remove a defect area with a width of 30-50μm on both sides of the strip to ensure the smoothness of the edges of the strip, then electrolytic polishing is used to make the surface roughness of the strip less than or equal to 0.20μm, so as to reduce pinholes and oxide doping, and then low-temperature nitrogen passivation treatment is performed at 150-200℃ for 5-15min to form a dense protective layer on the surface of the strip and improve its corrosion resistance in a humid heat environment. The quality inspection in the step S5 is at least one of amorphous structure detection, magnetic property detection, mechanical property detection, environmental reliability detection, and appearance detection. The amorphous structure detection includes XRD testing or DSC testing to confirm the amorphous phase content in the strip and calculate ΔTx to evaluate the thermal stability. The magnetic property detection is mainly used to test the coercive force, the saturation magnetic induction intensity, the resistivity, and the magnetostriction coefficient. The mechanical property detection mainly includes bending test and fatigue test to confirm the toughness of the strip in small bending radius winding. The environmental reliability detection is mainly the magnetic property drift test in a humid heat environment of 85℃ / 85%RH to ensure the long-term stability of the strip in extreme environment. The appearance detection is mainly to detect the thickness, the transverse thickness fluctuation, the surface roughness, the pinhole density, etc. to confirm whether the appearance is qualified. Through the above quality inspection, on the one hand, the product quality is confirmed to be qualified, and on the other hand, the process parameters are adjusted in time according to these performance parameters to optimize the product performance.

[0020] In the technical solution, on the basis of scientifically designing the composition of the cobalt-based amorphous strip and introducing two-stage tension annealing, edge and surface optimization treatment is effectively achieved through laser trimming and low-temperature nitrogen surface passivation treatment, so that the problems of cracks, defects and oxidation on the edges and surfaces of the strip in the prior art are solved, and the mechanical toughness and stability of the strip under high temperature and high humidity environment are further improved.

[0021] Further, in step S1, the aging treatment is further provided after step S3 and before step S4, and the operation of the aging treatment is specifically 150-200℃ for 1-4h.

[0022] In the technical solution, in order to further improve the long-term high-temperature working stability of the amorphous strip, the aging treatment process can be added. Through the aging treatment, the amorphous structure relaxation and micro stress release are promoted, so that the long-term performance drift is reduced, and the long-term thermal stability of the strip is ensured.

[0023] Further, the specific operation of step S4 is preferably: first, laser trimming is used to remove a defect area with a width of 30-40μm on both sides of the strip, and then low-temperature nitrogen passivation treatment is performed at 170-190℃ for 5-8min.

[0024] Compared with the prior art, the present application has at least the following beneficial effects: (1) The thermal stability is significantly enhanced By precisely adjusting the alloy composition and optimizing the annealing process, the cobalt-based amorphous strip obtained has a supercooled liquid phase region ΔTx≥120℃, which is increased by 15-25℃ compared with the prior art. Therefore, under the condition of 150℃ long-term heat exposure, it can still maintain a stable amorphous structure, which can meet the requirements of the high-temperature application field for the stability of the strip.

[0025] (2) The toughness is greatly improved By the two-stage annealing process and surface optimization treatment, the toughness of the cobalt-based amorphous strip is significantly improved. Under the bending condition of r=0.5mm, the bending life of the strip at 180° is ≥180 times, and some products are as high as 220 times, effectively solving the problem of brittle cracking of the prior art when winding at a small bending radius. Therefore, the cobalt-based amorphous strip has application prospects in the fields of small-sized magnetic cores and chip inductors, greatly widening the application range of the cobalt-based amorphous strip.

[0026] (3) The environmental reliability is obviously improved The performance drift of the cobalt-based amorphous strip obtained in the present application is ≤3.2% under the condition of 85℃ / 85%RH humid heat environment, and the stability is much better than that of the prior art. At the same time, the corrosion spots on the surface of the strip are significantly reduced, and the corrosion resistance under the humid heat condition is significantly improved, ensuring the consistency and reliability in long-term use, and meeting the demand of high-end electronic components for long-term stability.

[0027] (4) Excellent soft magnetic performance The cobalt-based amorphous strip obtained by the method has coercivity Hc≤2.2 A / m, saturation magnetic induction Bs≥0.93 T, resistivity ρ≥137 μΩ·cm, and magnetostriction coefficient |λs|≤1.3 ppm, and the magnetic loss is ≤68 mW / cm under the condition of 100 kHz and ΔB=0.1 T. 3 Compared with traditional materials, the magnetic loss is reduced by 10%-15%, and the performance in high-frequency transformer, inductor, wireless charging device and other high-frequency, low-noise and low-loss applications is greatly improved.

[0028] (5) High preparation feasibility The preparation method is simple and controllable, is based on existing mature metallurgical and heat treatment equipment, does not need to use extreme process conditions, and meets the production requirements of the existing industrial chain. The thickness of the strip is controllable, and the batch stability is good, which ensures the feasibility and consistency of large-scale production. The process design not only improves the product performance, but also significantly reduces the production cost, and has strong market competitiveness.

[0029] In summary, the composition of the cobalt-based amorphous strip is scientifically designed, and the annealing, edge and surface optimization treatment in the preparation method are combined, so that the thermal stability, toughness and environmental reliability and other performances of the cobalt-based amorphous strip are significantly improved, which provides more choices for high-frequency, low-noise, low-magnetic-loss and small-sized magnetic devices. Moreover, the preparation method has the advantages of simple process and controllability, and is suitable for large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 DSC curve of the product obtained in Example 1; Figure 2 Photo of the product obtained in Example 1; Figure 3 XRD pattern of the product obtained in Example 2; Figure 4 XRD pattern of the product obtained in Example 5. DETAILED DESCRIPTION

[0032] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0033] The chemical raw materials involved in the following examples and comparative examples are commercially available, and the devices and operations involved are conventional devices and operations in the art. It should be noted that the tests performed on the products prepared in each example and comparative example are as follows: (1) amorphous structure is determined by XRD; (2) Tg, Tx and ΔTx are determined by DSC; (3) resistivity p is measured by four-probe method; (4) coercivity Hc, saturation magnetic flux density Bs are determined by direct current / alternating current method, and magnetostriction coefficient |λs| is determined by strain gauge method; (5) magnetic loss is measured by power method under the conditions of 100 kHz and ΔB = 0.1 T; (6) the number of bending times is counted under the conditions of r = 0.5 mm and 180° bending until fracture; (7) performance drift before and after the test is tested under the conditions of 85°C / 85% RH for 168 h.

[0034] Example 1

[0035] A cobalt-based amorphous ribbon with high thermal stability and high toughness comprises the following components: Co 69.2at%, Fe 5at%, Ni 3.2at%, B 13at%, P 3.8at%, Si 2.8at%, C 0.2at%, Mo 1.4at%, Ta 0.6at%, Nd 0.3at%, Y 0.5at%; wherein the sum of the contents of Mo, Ta and Nd is 2.3at%, the sum of the contents of B, P, Si and C is 19.8at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.118, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0036] The preparation method of the above-mentioned cobalt-based amorphous ribbon is as follows: S1, smelting and purification Each raw material is placed into a vacuum induction smelting furnace for smelting, and the purity of each raw material is ≥99.9wt%; the background pressure of the cavity before smelting is not greater than 5×10 -2 Pa, and high-purity argon is filled for protection, 0.025wt% of Mg and 0.015wt% of Ca are added for purification during smelting, and the oxygen content is controlled to be ≤30ppm and the sulfur content is controlled to be ≤10ppm; S2, ribbon forming Cobalt-based amorphous ribbons with a thickness of 23-25 ​​μm were produced by using a single-roller rapid cooling method with a roller speed of 32 m / s and a nozzle-roller gap of 90 μm. S3, Two-stage tension annealing Annealing treatment in stage I was carried out by heating to 305℃ at a heating rate of 10℃ / min for 4 min and applying a tension of 35MPa. Then, annealing treatment in stage II was carried out by cooling to 285℃ at a cooling rate of 10℃ / min for 2.5 min and applying a tension of 12MPa. After stage II was completed, the tension was released after the temperature dropped below 200℃, and the transverse temperature difference was not greater than 5℃. S4, Edge and Surface Optimization First, laser trimming is used to remove the 40μm wide defect area on both sides of the strip. Then, electropolishing is performed to make the surface roughness Ra≤0.20μm of the strip. Finally, low-temperature nitrogen passivation treatment is carried out at 180℃ for 8min. S5, Quality Inspection We conduct amorphous structure testing, magnetic property testing, mechanical property testing, environmental reliability testing, and appearance inspection.

[0037] like Figure 1 As shown: The cobalt-based amorphous ribbon obtained in Example 1 exhibits a typical DSC curve for amorphous alloys, first showing a stepped glass transition temperature, followed by a sharp exothermic crystallization peak. By reading Tg and Tx, the supercooled liquid phase region ΔTx was calculated to be approximately 128℃, demonstrating its excellent thermal stability. Furthermore, as... Figure 2 As shown: The cobalt-based amorphous ribbon obtained in Example 1 has a smooth and bright surface, neat edges, and no obvious macroscopic cracks, warping or oxidation color. Overall, it has high appearance quality and good uniformity.

[0038] The properties of the cobalt-based amorphous ribbon obtained in Example 1 were tested and found to be: ΔTx ≥ 128℃, Hc ≈ 2.0 A / m, ρ ≈ 140 μΩ•cm, Bs ≈ 0.94 T, |λs| ≈ 1.1 ppm, bending cycles 200 times, and magnetic loss 60-62 mW / cm. 3 The performance drift at 85℃ / 85%RH is approximately 2.7%. The product obtained in this embodiment exhibits excellent thermal stability, toughness, environmental reliability, and soft magnetic properties, demonstrating good overall performance.

[0039] Example 2

[0040] A cobalt-based amorphous ribbon with high thermal stability and high toughness comprises the following components: Co 68.9at%, Fe 5.8at%, Ni 3at%, B 13.3at%, P 3.5at%, Si 2.7at%, C 0.25at%, Mo 1.2at%, Ta 0.5at%, Nd 0.35at%, Y 0.5at%; wherein the sum of the contents of Mo, Ta and Nd is 2.05at%, the sum of the contents of B, P, Si and C is 19.75at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.128, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0041] The preparation method of the cobalt-based amorphous ribbon is the same as that in Embodiment 1.

[0042] As shown in Figure 3 : the XRD pattern of the product obtained in Embodiment 2 shows a widened "steamed bun peak" without sharp crystal diffraction peaks, which are typical of amorphous structure.

[0043] Test results show that the cobalt-based amorphous ribbon obtained in Embodiment 2 has the following properties: ΔTx ≈ 123℃, Hc ≈ 2.1A / m, ρ ≈ 138μΩ•cm, Bs ≈ 0.93T, |λs| ≤ 1.3ppm, bending times 220 times, magnetic loss 61-64mW / cm 3 , and performance drift ≈ 2.9% under the condition of 85℃ / 85%RH. The product obtained in this embodiment has good thermal stability, toughness, environmental reliability and soft magnetism, and the toughness is particularly good.

[0044] Embodiment 3

[0045] A cobalt-based amorphous ribbon with high thermal stability and high toughness comprises the following components: Co 69.27at%, Fe 4.8at%, Ni 2.8at%, B 12.5at%, P 4.2at%, Si 3.2at%, C 0.18at%, Mo 1.6at%, Ta 0.7at%, Nd 0.25at%, Y 0.4at%, Ce 0.1at%; wherein the sum of the contents of Mo, Ta and Nd is 2.55at%, the sum of the contents of B, P, Si and C is 20.08at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.11, and the ratio of the content of Y to the sum of the contents of Y and Ce is 0.8.

[0046] The preparation method of the cobalt-based amorphous ribbon is the same as that in Embodiment 1.

[0047] The cobalt-based amorphous strip obtained in Example 3 has the following properties: ΔTx ≈ 126℃, Hc ≈ 2.2A / m, ρ ≈ 142μΩ·cm, Bs ≈ 0.93T, |λs| ≈ 1.2ppm, bending times 185 times, magnetic loss 62-63mW / cm 3 , and performance drift ≈ 2.5% under 85℃ / 85%RH environment. The product obtained in this example has good thermal stability, toughness, environmental reliability, and soft magnetism, and especially good corrosion resistance in high temperature and high humidity environment.

[0048] Example 4

[0049] A cobalt-based amorphous strip with high thermal stability and high toughness comprises the following components: Co 68.78at%, Fe 6.2at%, Ni 2.5at%, B 12.8at%, P 3.6at%, Si 3at%, C 0.22at%, Mo 1.5at%, Ta 0.55at%, Nd 0.35at%, and Y 0.5at%; wherein the sum of the contents of Mo, Ta, and Nd is 2.4at%, the sum of the contents of B, P, Si, and C is 19.62at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.126, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0050] The cobalt-based amorphous strip is prepared by the method of Example 1.

[0051] The cobalt-based amorphous strip obtained in Example 4 has the following properties: ΔTx ≈ 121℃, Hc ≈ 2.1A / m, ρ ≈ 141μΩ·cm, Bs ≈ 0.96T, |λs| ≈ 1.2ppm, bending times 190 times, and magnetic loss ≈ 63mW / cm 3 , and performance drift ≈ 3% under 85℃ / 85%RH environment. The product obtained in this example has good thermal stability, toughness, environmental reliability, and soft magnetism, and especially good saturation magnetic induction.

[0052] Example 5

[0053] A cobalt-based amorphous strip with high thermal stability and high toughness comprises the following components: Co 69.5at%, Fe 4.7at%, Ni 3.5at%, B 13.5at%, P 3.5at%, Si 2.5at%, C 0.2at%, Mo 1.3at%, Ta 0.6at%, Nd 0.3at%, and Y 0.4at%; wherein the sum of the contents of Mo, Ta, and Nd is 2.2at%, the sum of the contents of B, P, Si, and C is 19.7at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.118, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0054] The preparation method of the cobalt-based amorphous strip is the same as that in Embodiment 1.

[0055] As shown in Figure 4 the XRD pattern of the product obtained in Embodiment 5 also shows a widened "steamed bun peak" without sharp crystal diffraction peaks, which are typical of amorphous structure.

[0056] Test results show that the cobalt-based amorphous strip obtained in Embodiment 5 has the following properties: ΔTx≈124℃, Hc≈2.1A / m, ρ≈139μΩ•cm, Bs≈0.93T, |λs|≈1.1ppm, bending times 180 times, magnetic loss 58-60mW / cm 3 , and performance drift under the environment of 85℃ / 85%RH≈2.9%. The product obtained in this embodiment has good thermal stability, toughness, environmental reliability and soft magnetic properties, especially excellent magnetic loss performance.

[0057] Embodiment 6

[0058] A cobalt-based amorphous strip with high thermal stability and high toughness comprises the following components: Co 69.2at%, Fe 5at%, Ni 3.2at%, B 13at%, P 3.8at%, Si 2.8at%, C 0.2at%, Mo 1.4at%, Ta 0.6at%, Nd 0.3at%, and Y 0.5at%; wherein the sum of the contents of Mo, Ta and Nd is 2.3at%, the sum of the contents of B, P, Si and C is 19.8at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.118, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0059] The preparation method of the cobalt-based amorphous strip is the same as that in Embodiment 1, except that the wheel speed and the nozzle-roller gap in step S2 are adjusted, the wheel speed is 30m / s, and the nozzle-roller gap is 100μm, and the thickness of the product obtained is 26-28μm; the rest are the same as in Embodiment 1.

[0060] Test results show that the cobalt-based amorphous strip obtained in Embodiment 6 has the following properties: ΔTx≈121-126℃, Hc≈2.1A / m, ρ≈143μΩ•cm, Bs≈0.93T, |λs|≈1.1ppm, bending times 180 times, magnetic loss 63-66mW / cm 3 , and performance drift under the environment of 85℃ / 85%RH≈3%. The product obtained in this embodiment has good thermal stability, toughness, environmental reliability and soft magnetic properties.

[0061] Embodiment 7

[0062] A cobalt-based amorphous ribbon with high thermal stability and high toughness comprises the following components: Co 68.6at%, Fe 5.5at%, Ni 3at%, B 13.2at%, P 3.6at%, Si 2.9at%, C 0.2at%, Mo 1.5at%, Ta 0.6at%, Nd 0.3at%, and Y 0.6at%; wherein the sum of the contents of Mo, Ta, and Nd is 2.4at%, the sum of the contents of B, P, Si, and C is 19.9at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.124, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0063] The preparation method of the above cobalt-based amorphous ribbon further comprises an aging treatment process between step S3 and step S4, i.e., the product obtained in step S3 is heat treated at 180℃ for 2h. The rest is the same as in Example 1.

[0064] Test results show that the cobalt-based amorphous ribbon obtained in Example 7 has the following properties: ΔTx≈125℃, Hc≈2A / m, ρ≈140μΩ·cm, Bs≈0.94T, |λs|≈1.1ppm, bending frequency 200 times, magnetic loss 61-63mW / cm 3 , and performance drift ≈3.2% under the condition of 85℃ / 85%RH. The product obtained in this example has good thermal stability, toughness, environmental reliability, and soft magnetism, and has excellent high-temperature stability.

[0065] Example 8

[0066] A cobalt-based amorphous ribbon with high thermal stability and high toughness comprises the following components: Co 69.3at%, Fe 5at%, Ni 3.2at%, B 13at%, P 3.8at%, Si 2.8at%, C 0.1at%, Mo 1.4at%, Ta 0.6at%, Nd 0.3at%, and Y 0.5at%; wherein the sum of the contents of Mo, Ta, and Nd is 2.3at%, the sum of the contents of B, P, Si, and C is 19.7at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.118, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0067] The preparation method of the above cobalt-based amorphous ribbon is the same as in Example 1.

[0068] Test results show that the cobalt-based amorphous ribbon obtained in Example 8 has the following properties: ΔTx≈120℃, Hc≈1.9A / m, ρ≈137μΩ·cm, Bs≈0.93T, |λs|≈1.0ppm, bending frequency 190 times, magnetic loss 65-67mW / cm 3The performance drift under 85℃ / 85%RH environment is about 3.1%. The product obtained in this embodiment has good thermal stability, toughness, environmental reliability and soft magnetism.

[0069] Example 9

[0070] A cobalt-based amorphous ribbon with high thermal stability and high toughness comprises the following components: Co 69at%, Fe 5at%, Ni 3.2at%, B 13at%, P 3.8at%, Si 2.8at%, C 0.2at%, Mo 1.4at%, Ta 0.6at%, Nd 0.5at%, and Y 0.5at%. The sum of the contents of Mo, Ta and Nd is 2.5at%, the sum of the contents of B, P, Si and C is 19.8at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.119, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0071] The preparation method of the cobalt-based amorphous ribbon is the same as that in Example 1.

[0072] Test results show that the cobalt-based amorphous ribbon obtained in Example 9 has the following performances: ΔTx≈127℃, Hc≈2.1A / m, ρ≈141μΩ•cm, Bs≈0.94T, |λs|≈1.2ppm, bending times 210 times, and magnetic loss 59-61mW / cm 3 The performance drift under 85℃ / 85%RH environment is about 2.8%. The product obtained in this embodiment has good thermal stability, toughness, environmental reliability and soft magnetism.

[0073] Example 10

[0074] A cobalt-based amorphous ribbon with high thermal stability and high toughness comprises the following components: Co 69at%, Fe 5at%, Ni 3.2at%, B 13at%, P 3.8at%, Si 2.8at%, C 0.2at%, Mo 1.4at%, Ta 0.6at%, Nd 0.5at%, and Y 0.5at%. The sum of the contents of Mo, Ta and Nd is 2.5at%, the sum of the contents of B, P, Si and C is 19.8at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.119, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0075] Compared with the preparation method in Example 1, the technical parameters of the two-stage tension annealing in step S3 are adjusted as follows: the heating rate and the cooling rate are both adjusted to 50℃ / min, the annealing time of stage I is 3min, and the annealing time of stage II is 2min.

[0076] The cobalt-based amorphous strip obtained in Example 10 has the following properties: ΔTx≈122℃, Hc≈2.2A / m, ρ≈142μΩ·cm, Bs≈0.93T, |λs|≈1.3ppm, bending times 180 times, magnetic loss 66-68mW / cm 3 , and performance drift under 85℃ / 85%RH environment≈3.2%. The product obtained in this embodiment has good thermal stability, toughness, environmental reliability and soft magnetism.

[0077] Example 11

[0078] A cobalt-based amorphous strip with high thermal stability and high toughness, comprising the following components: Co 73at%, Fe 5.42at%, Ni 1.78at%, B 11.5at%, P 2.5at%, Si 2.8at%, C 0.2at%, Mo 1at%, Ta 0.4at%, Nd 0.4at%, Y 0.7at%, Ce 0.3at%; wherein the sum of the contents of Mo, Ta and Nd is 1.8at%, the sum of the contents of B, P, Si and C is 17at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.099, and the ratio of the content of Y to the sum of the contents of Y and Ce is 0.7.

[0079] The cobalt-based amorphous strip obtained in Example 11 has the following properties: ΔTx≈120℃, Hc≈2.2A / m, ρ≈137μΩ·cm, Bs≈0.93T, |λs|≈1.3ppm, bending times 180 times, magnetic loss≤68mW / cm 3 , and performance drift under 85℃ / 85%RH environment≈3.2%. The product obtained in this embodiment has good thermal stability, toughness, environmental reliability and soft magnetism.

[0080] Example 12

[0081] A cobalt-based amorphous strip with high thermal stability and high toughness, comprising the following components: Co 71.2at%, Fe 3.6at%, Ni 2.1at%, B 14.5at%, P 2.5at%, Si 3.3at%, C 0.2at%, Mo 1at%, Ta 0.4at%, Nd 0.4at%, Y 0.8at%; wherein the sum of the contents of Mo, Ta and Nd is 1.8at%, the sum of the contents of B, P, Si and C is 20.5at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.08, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0082] The cobalt-based amorphous strip obtained in Example 12 has the following properties: ΔTx≈122℃, Hc≈2.1A / m, ρ≈138μΩ·cm, Bs≈0.94T, |λs|≈1.2ppm, bending times 185 times, magnetic loss≤65mW / cm 3 , and the performance drift under 85℃ / 85%RH environment is about 3.0%. The product obtained in this example has good thermal stability, toughness, environmental reliability and soft magnetic properties.

[0083] Example 13

[0084] A cobalt-based amorphous strip with high thermal stability and high toughness comprises the following components: Co 67.1at%, Fe 5.4at%, Ni 5at%, B 13.1at%, P 3.4at%, Si 3at%, C 0.2at%, Mo 1.55at%, Ta 0.6at%, Nd 0.4at%, Y 0.25at%; wherein the sum of the contents of Mo, Ta and Nd is 2.55at%, the sum of the contents of B, P, Si and C is 19.7at%, the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.155, and the ratio of the content of Y to the sum of the contents of Y and Ce is 1.

[0085] The cobalt-based amorphous strip obtained in Example 13 has the following properties: ΔTx≈124℃, Hc≈2.2A / m, ρ≈140μΩ·cm, Bs≈0.93T, |λs|≈1.2ppm, bending times 190 times, magnetic loss≤66mW / cm 3 , and the performance drift under 85℃ / 85%RH environment is about 3.1%. The product obtained in this example has good thermal stability, toughness, environmental reliability and soft magnetic properties.

[0086] Example 14

[0087] Compared with Example 1, only the conditions of two-stage tension annealing in step S3 in the preparation method are adjusted, and the rest are consistent with Example 1. In this example, stage I: annealing temperature 300℃, annealing time 5min, 40MPa tension is applied, and stage II in this example: annealing temperature 280℃, annealing time 2min, 15MPa tension is applied.

[0088] The cobalt-based amorphous strip obtained in Example 14 has the following properties: ΔTx≈125℃, Hc≈2.1A / m, ρ≈139μΩ·cm, Bs≈0.93T, |λs|≈1.1ppm, bending times 195 times, magnetic loss≤62mW / cm 3 , and the performance drift under 85℃ / 85%RH environment is about 2.8%. The product obtained in this example has good thermal stability, toughness, environmental reliability and soft magnetic properties.

[0089] Example 15

[0090] Compared with Example 1, only the conditions of two-stage tension annealing shown in step S3 in the preparation method are adjusted, and the rest are consistent with Example 1. In this example, stage I: annealing temperature 310℃, annealing time 3min, 30MPa tension is applied, stage II in this example: annealing temperature 290℃, annealing time 3min, 10MPa tension is applied.

[0091] Tested, the properties of the cobalt-based amorphous strip obtained in Example 15 are: ΔTx≈123℃, Hc≈2.0A / m, ρ≈141μΩ•cm, Bs≈0.94T, |λs|≈1.0ppm, bending times 190 times, magnetic loss≤61mW / cm 3 , performance drift≈2.9% under 85℃ / 85%RH environment. The product obtained in this example has good thermal stability, toughness, environmental reliability and soft magnetism.

[0092] Example 16

[0093] Compared with Example 7, the chemical composition of the cobalt-based amorphous strip is completely consistent, except that it is not subjected to aging treatment, and the rest is consistent with Example 1.

[0094] Tested, the properties of the cobalt-based amorphous strip obtained in Example 16 are: ΔTx≈118℃, Hc≈2.1A / m, ρ≈139μΩ•cm, Bs≈0.93T, |λs|≈1.2ppm, bending times 185 times, magnetic loss≤64mW / cm 3 , performance drift≈3.5% under 85℃ / 85%RH environment. The product obtained in this example has good thermal stability, toughness, environmental reliability and soft magnetism.

[0095] Comparative Example 1 Compared with Example 1, Mo is removed from the composition of the cobalt-based amorphous strip, and the proportion of Co is adjusted to 69.7at%, and the rest of the components are consistent with Example 1, and the preparation method is also consistent with Example 1.

[0096] Tested, the properties of the cobalt-based amorphous strip obtained in Comparative Example 1 are: ΔTx≈110℃, Hc 2.2-2.8A / m, ρ≈132μΩ•cm, Bs≈0.91T, |λs|≈1.4ppm, bending times 78 times, magnetic loss about 65mW / cm 3 , performance drift 4%-4.5% under 85℃ / 85%RH environment.

[0097] Comparative Example 2 Compared with Example 1, the composition of the cobalt-based amorphous strip is the same, except that the content of Nd is removed and the content of Co is adjusted to 69.5 at%. The rest of the components are the same as those in Example 1, and the preparation method is also the same as that in Example 1.

[0098] Test results show that the cobalt-based amorphous strip obtained in Comparative Example 2 has the following properties: ΔTx≈115℃, Hc≈2.3A / m, ρ≈130μΩ·cm, Bs≈0.91T, |λs|≈1.5ppm, bending frequency 165 times, and magnetic loss about 67mW / cm 3 , and the performance drift under 85℃ / 85%RH environment is about 3.5%.

[0099] Comparative Example 3 Compared with Example 1, the chemical composition of the cobalt-based amorphous strip is the same, except that the two-stage tension annealing in step S3 of the preparation method is adjusted to single-stage annealing. The specific operation of single-stage annealing is: applying 30MPa tension at 305℃ for 5min. The rest are the same as those in Example 1.

[0100] Test results show that the cobalt-based amorphous strip obtained in Comparative Example 3 has a large fluctuation range of Hc value, which is 2-2.8A / m, and a bending frequency of 150 times, and a shorter bending life.

[0101] Comparative Example 4 Compared with Example 1, the chemical composition of the cobalt-based amorphous strip is the same, except that the low-temperature nitrogen passivation treatment in step S4 of the preparation method is omitted. The rest are the same as those in Example 1.

[0102] Test results show that the cobalt-based amorphous strip obtained in Comparative Example 4 has a performance drift of 4%-5% under 85℃ / 85%RH environment, and visible corrosion spots appear on the surface of the product after testing.

[0103] Comparative Example 5 Compared with Example 1, the chemical composition of the cobalt-based amorphous strip is the same, except that the content of C is adjusted to 0.4at% and the content of B is adjusted to 12.8at%. The rest of the components are the same as those in Example 1, and the preparation method is also the same as that in Example 1.

[0104] Test results show that the cobalt-based amorphous strip obtained in Comparative Example 5 has the following properties: ΔTx≈118℃, Hc≈2.3A / m, ρ≈136μΩ·cm, Bs≈0.91T, |λs|≈1.6ppm, bending frequency 140 times, and magnetic loss about 70mW / cm 3 , and the performance drift under 85℃ / 85%RH environment is about 3.8%.

[0105] Comparative Example 6 A cobalt-based amorphous strip material, comprising the following components: Co 75 at%, Fe 2 at%, B 15 at%, Si 8 at%. The preparation method thereof is compared with that of Example 1, and the two-stage tension annealing shown in step S3 is adjusted to single-stage annealing. The specific operation of the single-stage annealing is: annealing at 310 DEG C for 10 min (without applying tension), and the rest are consistent with Example 1.

[0106] Tested, the cobalt-based amorphous strip material obtained in Comparative Example 6 has the following properties: ΔTx ≈ 95 DEG C, Hc 3-3.5 A / m, ρ ≈ 125 μΩ·cm, Bs ≈ 0.88 T, |λs| ≈ 2.0 ppm, bending times 145 times, magnetic loss 75-80 mW / cm 3 , performance drift ≈ 4% under the environment of 85 DEG C / 85% RH.

[0107] From the test results of the above examples and comparative examples, it can be seen that: (1) The test results of Example 1-Example 16 and Comparative Example 6 show that, compared with conventional cobalt-based amorphous strip materials, the thermal stability, toughness, environmental reliability and soft magnetic properties of the cobalt-based amorphous strip material of the present application are significantly improved. It can be seen that the present application plays an important role in improving the comprehensive performance of the cobalt-based amorphous strip material through the synergistic optimization of the elements and the combination of the two-stage tension annealing in the preparation method.

[0108] (2) The test results of Example 1 and Comparative Example 1 show that when the cobalt-based amorphous strip material lacks Mo element, the supercooled liquid phase region ΔTx of the strip material decreases significantly, the bending life is greatly reduced, and the performance drift is intensified under high temperature and high humidity environment, and the soft magnetic properties also deteriorate. This shows that Mo is not only a key element for improving thermal stability, but also plays an indispensable role in enhancing the toughness of the strip material, improving the environmental reliability and optimizing the soft magnetic properties in cooperation with elements such as Ta and Nd. The test results of Example 1 and Comparative Example 2 show that when the cobalt-based amorphous strip material lacks Nd element, the thermal stability of the strip material decreases, the magnetic loss increases significantly, the bending life is shortened sharply, and the environmental reliability is also significantly deteriorated. This proves that Nd plays a key role in improving the toughness of the material, reducing the high-frequency magnetic loss and enhancing the moisture resistance and heat resistance, and its effect depends on the synergistic cooperation with elements such as Mo and Ta.

[0109] From the test results of Example 1 and Comparative Example 5, it can be seen that when the content of C in the cobalt-based amorphous strip exceeds the limited range, the toughness of the strip deteriorates significantly and the magnetostriction coefficient increases, which shows that excessive C will adversely affect the toughness and magnetic properties of the strip, and excessive C also causes a certain degree of deterioration of the thermal stability and environmental reliability, and the content of C also has a certain degree of influence on the thermal stability and environmental reliability. Obviously, the effects of each element in the strip are not independent, but are influenced and restricted by other elements. The cobalt-based amorphous strip according to the present application has good comprehensive properties because each element influences and acts together within the limited content range.

[0110] (3) From the test results of Example 1 and Comparative Example 3, it can be seen that the two-stage tension annealing according to the present application is a necessary condition for obtaining stable and excellent soft magnetic properties and mechanical toughness, and further from the test results of Example 14 and Example 15, it can be seen that amorphous strips with good soft magnetic properties and mechanical toughness can be obtained by processing under the two-stage tension annealing conditions defined in the present application. Further, from the test results of Example 1 and Comparative Example 4, it can be seen that the low-temperature nitrogen passivation treatment according to the present application is a key process for ensuring the long-term environmental reliability of the amorphous strip, and its combination with the two-stage tension annealing can effectively improve the environmental reliability of the amorphous strip.

[0111] (4) From the test results of Example 7 and Example 16, it can be seen that the addition of aging treatment between the two-stage annealing and the edge and surface optimization can further improve the heat resistance and stability of the strip and ensure the long-term thermal stability of the strip.

[0112] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can modify, replace, substitute and deform the above embodiments within the scope of the present application. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

Claims

1. A cobalt-based amorphous ribbon having high thermal stability and high toughness, characterized in that: The alloy comprises the following components: Co 66at%-73at%, Fe 3.5at%-8at%, Ni 1.5at%-5at%, B 11.5at%-14.5at%, P 2.5at%-5.5at%, Si 1.5at%-4.5at%, C 0.1at%-0.35at%, Mo 1at%-2at%, Ta 0.4at%-1at%, Nd 0.18at%-0.5at%, Y 0.25at%-0.9at%, Ce 0-0.3at%, and the sum of the contents of the components is 100at%; meanwhile, the contents of the components satisfy the following relationships: Relationship one: the sum of the contents of Mo, Ta and Nd is 1.8at%-2.55at%; Relationship two: the sum of the contents of B, P, Si and C is 17at%-20.5at%; Relationship three: the ratio of the sum of the contents of Fe and Ni to the content of Co is 0.08-0.155; Relationship four: the ratio of the content of Y to the sum of the contents of Y and Ce is ≥0.

7.

2. The high-thermal-stability, high-toughness cobalt-based amorphous ribbon of claim 1, wherein: thickness of 20-28 μm, transverse thickness fluctuation ≤±5%, surface roughness Ra≤0.20 μm, pinhole density ≤0.3 per cm 2 .

3. The high thermal stability, high ductility cobalt-based amorphous ribbon of claim 1, wherein: The undercooling liquid phase region ΔTx of the alloy is ≥120℃; and the 180° bending life of the alloy is ≥180 times under the condition of a radius of 0.5mm.

4. The high-thermal-stability, high-toughness cobalt-based amorphous ribbon of claim 1, wherein: The performance drift of the alloy is ≤3.2% under the environment of 85℃ / 85%RH for 168h.

5. The high-thermal-stability, high-toughness cobalt-based amorphous ribbon of claim 1, wherein: The coercive force Hc thereof is ≤ 2.2 A / m, the saturation magnetic induction Bs is ≥ 0.93 T, the resistivity p is ≥ 137 μΩ-cm, the magnetostriction coefficient |λs| is ≤ 1.3 ppm, and the magnetic loss is ≤ 68 mW / cm under the condition of 100 kHz and ΔB = 0.1 T 3 .

6. A method of producing a high-thermal-stability, high-toughness cobalt-based amorphous ribbon as claimed in any one of claims 1-5, characterized by: The method comprises the following steps: S1, smelting and purification; S2, tape casting; S3, two-stage tension annealing: the annealing temperature of stage I is 300-310℃, the annealing time is 3-5min, and a tension of 30-40MPa is applied; the annealing temperature of stage II is 280-290℃, the annealing time is 2-3min, and a tension of 10-15MPa is applied; after the completion of stage II, the tension is removed when the temperature drops to below 200℃, and the transverse temperature difference is not more than 5℃; S4, edge and surface optimization; S5, quality inspection.

7. The method of claim 6, wherein the high thermal stability, high ductility, cobalt-based amorphous ribbon is prepared by the steps of: When the two-stage tension annealing is performed, the heating rate of the annealing temperature is not higher than 50℃ / min. ​ 8. The preparation method of the high-thermal-stability and high-toughness cobalt-based amorphous strip material according to claim 6, characterized in that: The step S1 is specifically operated as follows: each raw material is put into a vacuum induction melting furnace for melting, the cavity background pressure before melting is not more than 5*10 -2 Pa, high-purity argon is filled for protection, 0.02wt%-0.03wt% Mg and 0.01wt%-0.02wt% Ca are added in the raw material for purification during melting, the oxygen content is controlled to be less than or equal to 30ppm, and the sulfur content is controlled to be less than or equal to 10ppm. In step S2, the single-roller rapid cooling method is adopted, the wheel speed is 30-34m / s, and the nozzle-roller gap is 80-100μm; In step S4, the laser trimming is first used to remove a defect area with a width of 30-50μm on both sides of the strip material, then the electrolytic polishing is performed to make the surface roughness Ra of the strip material ≤0.20μm, and then the low-temperature nitrogen passivation treatment is performed at 150-200℃ for 5-15min; In step S5, the quality inspection is at least one of amorphous structure detection, magnetic property detection, mechanical property detection, environmental reliability detection and appearance detection.

9. The method of claim 6, wherein the high thermal stability, high ductility, cobalt-based amorphous ribbon is prepared by the steps of: After step S3 and before step S4, the aging treatment is further provided, and the operation of the aging treatment is specifically 150-200℃ for 1-4h. ​ 10. The method of claim 8, wherein the high thermal stability, high ductility, cobalt-based amorphous ribbon is prepared by the steps of: In step S4, the laser trimming is first used to remove a defect area with a width of 30-40μm on both sides of the strip material, then the electrolytic polishing is performed, and then the low-temperature nitrogen passivation treatment is performed at 170-190℃ for 5-8min. ​

Images