High-elongation iron-cobalt-vanadium alloy feed and iron-cobalt-vanadium alloy processing method

Abstract

The embodiment of the invention discloses a high-elongation iron-cobalt-vanadium alloy feed and an iron-cobalt-vanadium alloy processing method, and the feed comprises the following components in percentage by mass: 5-10% of polyformaldehyde, 1-3% of a lubricant, 0.1-1% of an antioxidant and 87-93% of iron-cobalt-vanadium-chromium alloy powder. According to the method, the matrix iron-cobalt alloy structure in the sintering process is improved by adding the trace chromium, precipitation of an unstable phase is reduced through the solid solution technology, the elongation of iron-cobalt-vanadium is improved by adding the trace chromium, the alloy can be used for producing complex powder injection molding structural parts and can be subjected to shaping machining, and the risk of machining breakage is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of powder injection molding, in particular to a high-elongation Fe-Co-V alloy feedstock and a Fe-Co-V alloy processing method. BACKGROUND

[0002] Fe-Co-V alloy is widely used in aerospace, electronic devices and other fields due to its excellent magnetic properties, high temperature strength and wear resistance. FeCo2V is a soft magnetic material, and its actual elongation is only about 2%. The published data shows that the elongation of the Fe-Co-V material produced by the famous BASF company in Germany is only ≥1.5%. In engineering, materials with elongation <5% are called brittle materials. The ductility of the material is poor, which limits its application field and processing method. In the powder injection molding process, due to the differences in the mixing of the original powder, the sintering process and other problems, a certain amount of pores are retained in the formed part, the grain is coarse after sintering, and the elongation is insufficient, so that the elongation cannot be improved, and subsequent structure modification such as shaping cannot be carried out.

[0003] In order to improve the elongation of the material, the current main way is to adjust the sintering temperature or refine the grain, but the effect is limited and the process is complex. Therefore, there is an urgent need for a process innovation to solve the above problems. SUMMARY

[0004] In order to solve the existing technical problems, the embodiments of the present application provide a high-elongation Fe-Co-V alloy feedstock and a Fe-Co-V alloy processing method. The technical solution is as follows:

[0005] In a first aspect, a high-elongation Fe-Co-V alloy feedstock is provided, which comprises, in mass percentage: polyformaldehyde 5-10%, lubricant 1-3%, antioxidant 0.1-1%, and Fe-Co-V-Cr alloy powder 87-93%.

[0006] Further, the feedstock comprises, in mass percentage: polyformaldehyde 8%, lubricant 1.5%, antioxidant 0.5%, and Fe-Co-V-Cr alloy powder 90%, wherein the Fe-Co-V-Cr alloy powder comprises, in mass percentage: Fe 49%, Co 49%, V 1.8%, and Cr 0.2%.

[0007] Further, the polyformaldehyde is copolymer type FF520, the antioxidant is BASF B215, and the lubricant is stearic acid, magnesium stearate or zinc stearate.

[0008] In a second aspect, a high-elongation Fe-Co-V alloy processing method is provided, comprising the following steps:

[0009] Fe-Co alloy powder, vanadium powder and chromium powder are taken and mixed to obtain Fe-Co-V-Cr alloy powder;

[0010] The iron cobalt-vanadium chromium alloy powder, polyformaldehyde, lubricant and antioxidant are mixed, and the iron cobalt-vanadium alloy feedstock is obtained after cooling;

[0011] The iron cobalt-vanadium alloy feedstock is injection molded, and the green body is obtained after cooling and solidification.

[0012] Further, the method further comprises:

[0013] The green body is debound at 110 DEG C for 8-10 h, acid is added at 240 g / h during the debinding process, and argon is filled at 60 L / min to obtain the debound green body;

[0014] The debound green body is sintered at 1380 DEG C for 180 min, argon protection is used during the sintering process, and a 50 Kpa partial pressure is set to obtain the sintered part;

[0015] The sintered part is heated to 800 DEG C at a rate of 3 DEG C / min under a vacuum degree of 10 -1 Pa, and held for 60 min, then heated to 1050 DEG C at a rate of 5 DEG C / min, held for 90 min, and finally cooled to room temperature at a cooling rate of 50 DEG C / min under 5-6 atmospheres.

[0016] Further, the preparation method of the iron cobalt-vanadium chromium alloy powder comprises:

[0017] The water atomized vanadium powder and the chromium powder are mixed at a mass ratio of 9:1, ball milled for 24 h to obtain the vanadium chromium alloy powder;

[0018] The vanadium chromium alloy powder is dried, mixed with the gas atomized iron cobalt alloy powder at a mass ratio of 1:49 for 12 h to obtain the iron cobalt-vanadium chromium alloy powder.

[0019] Further, the powder particle size of the water atomized vanadium powder is D50 = 8-10 μm, the powder particle size of the chromium powder is D50 = 5-7 μm, and the powder particle size of the gas atomized iron cobalt alloy is D50 = 8-10 μm, D10 = 2-4 μm, and D90 = 20-23 μm.

[0020] Further, the specific method of the mixing is:

[0021] The iron cobalt-vanadium chromium alloy powder is added to the mixing cavity, argon is introduced into the mixing cavity, heated at 180 DEG C for 15 min, then polyformaldehyde, lubricant and antioxidant are added, mixed for 45 min, then cut into particles, and cooled to obtain the iron cobalt-vanadium alloy feedstock.

[0022] Further, the mass percentage comprises 8% of polyformaldehyde, 1.5% of lubricant, 0.5% of antioxidant, and 90% of iron cobalt-vanadium chromium alloy powder.

[0023] Further, the polyformaldehyde is a copolymer type FF520, the antioxidant is BASF B215, and the lubricant is stearic acid, magnesium stearate or zinc stearate.

[0024] The high-elongation Fe-Co-V alloy feed provided by the embodiment of the application comprises, in percentage by mass, 5-10% of polyformaldehyde, 1-3% of lubricant, 0.1-1% of antioxidant, and 87-93% of Fe-Co-V-Cr alloy powder. The application improves the sintering process of the base Fe-Co alloy structure by adding trace chromium, reduces the precipitation of unstable phases through a solid solution process, and improves the elongation of the Fe-Co-V alloy by adding trace chromium, so that the alloy can be used to produce complex powder injection molding structural parts and can be shaped, thereby reducing the risk of processing fracture. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the 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 application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a metallographic structure diagram of a conventional FeCo2V material workpiece;

[0027] Figure 2 is a metallographic structure diagram of a high-elongation FeCo2V material workpiece provided by the embodiment 2 of the application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the application more clear, the embodiments of the application will be further described in detail below with reference to the drawings.

[0029] It should be clear that the described embodiments are only some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0030] The following description refers to the accompanying drawings. Unless otherwise indicated, same numbers in different drawings indicate the same or similar elements. The implementations described in the following example embodiments are not meant to represent all implementations consistent with the application. On the contrary, they are meant to represent some of the apparatus and methods consistent with some aspects of the application as detailed in the appended claims.

[0031] In the description of the present application, it should be understood that the terms "first", "second", "third" and the like are merely used to distinguish similar objects, and do not necessarily describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. In the description of the present application, "a plurality of" means two or more, unless otherwise specified.

[0032] Example 1

[0033] (1) Preparation of iron-cobalt-vanadium-chromium alloy powder

[0034] Take 180g of water atomized vanadium powder with a powder size D50 = 8-10μm; take another 20g of chromium powder with a powder size D50 = 5-7μm; put both into a mixing barrel, use a centrifugal high-speed ball mill to high-speed ball mill for 24h, after the two powders are fully mixed, the vanadium-chromium alloy powder is obtained, and the full mixing is uniform, which is beneficial to reducing the microstructure segregation in the later sintering. Dry the vanadium-chromium alloy powder for 10h, and store the dried vanadium-chromium alloy powder under vacuum condition for standby.

[0035] Take 9800g of gas atomized iron-cobalt alloy powder with a powder size D50 = 8-10μm, D10 = 2-4μm, D90 = 20-23μm. Mix the dried vanadium-chromium alloy powder and the gas atomized iron-cobalt alloy powder with a three-dimensional mixer for 12h to obtain an iron-cobalt-vanadium-chromium alloy powder. The elemental powder ratio of the iron-cobalt-vanadium-chromium alloy powder is shown in Table 1.

[0036] Table 1 Elemental powder ratio

[0037] Element Fe Co V Cr Content 49％ 49％ 1.8％ 0.2％ Actual weight 4900g 4900g 180g 20g

[0038] (2) Preparation of high-elongation iron-cobalt-vanadium alloy feedstock

[0039] In order to ensure the safety of the process and prevent the oxidation of part of the alloy powder, argon gas positive pressure protection is required during the processing process, and the pressure is 1.2atm.

[0040] Put 9300g of iron-cobalt-vanadium-chromium alloy powder into the mixing cavity of the mixer, then introduce argon gas into the mixing cavity, set the heating temperature to 180℃ for 15 minutes, then add polyformaldehyde 500g, lubricant 100g and antioxidant 100g, mix for 45 minutes, then cut the particles, and cool to obtain the iron-cobalt-vanadium alloy feedstock.

[0041] The ratio of iron-cobalt-vanadium-chromium alloy powder to polyformaldehyde, lubricant and antioxidant is as follows (mass percentage):

[0042] (A) Iron-cobalt-vanadium-chromium alloy powder: 93%;

[0043] (B) Polyformaldehyde: 5%, copolymer type FF520;

[0044] (C) Lubricant: 1%, magnesium stearate;

[0045] (D) Antioxidant: 1%, BASF B215.

[0046] (3) Preparation of high elongation iron-cobalt-vanadium alloy material

[0047] The processed iron-cobalt-vanadium alloy feedstock is injection molded, with the temperature set at 180-190°C, the injection pressure at 80-120 MPa, the holding time at 20-30 s, and the mold temperature at 100°C. After injection molding, the workpiece is placed on a ceramic plate and then put into a degreasing furnace for degreasing.

[0048] The degreasing temperature is set at 110°C, the nitrogen flow rate at 60 L / min, the nitric acid amount at 240 g / h, and the degreasing time at 8-10 h to ensure that the degreasing meets the standard. After completion, the degreased part is placed into a sintering furnace for sintering.

[0049] In order to achieve high densification of iron-cobalt-vanadium powder particles during sintering, the sintering temperature is set at 1380°C and the holding time at 180 minutes. Argon gas protection is used during sintering, and a 50 KPa partial pressure is adopted to prevent metal evaporation during sintering. Due to the addition of trace chromium in the powder, the powder obtains a certain liquid phase, and the final densification is higher than that of conventional iron-cobalt-vanadium sintered parts.

[0050] The sintered part is placed into a vacuum heat treatment furnace, the vacuum degree is set at 10 -1 Pa, the temperature is raised to 800°C at a rate of 3°C / min, and the holding time is 60 min to ensure uniform heating of the sintered part in different areas of the furnace. Then the temperature is raised to 1050°C at a rate of 5°C / min, and the holding time is 90 min to ensure complete dissolution of iron-cobalt-vanadium precipitated phase. Finally, the cooling rate is set at 5-6 atm and 50°C / min to cool to room temperature, obtaining a high-elongation iron-cobalt-vanadium alloy material workpiece.

[0051] Example 2

[0052] (1) Preparation of iron-cobalt-vanadium-chromium alloy powder

[0053] Take 162 g of water-atomized vanadium powder with a particle size D50 = 8-10 μm, and another 18 g of chromium powder with a particle size D50 = 5-7 μm. Mix the two powders in a mixing barrel using a centrifugal high-speed ball mill for 24 h. After the two powders are thoroughly mixed, a vanadium-chromium alloy powder is obtained. Thorough mixing and uniformity are beneficial to reducing structural segregation during later sintering. Dry the vanadium-chromium alloy powder for 10 h, and store the dried vanadium-chromium alloy powder under vacuum for future use.

[0054] Take the gas atomized iron-cobalt alloy powder 8820g, the powder particle size D50=8-10μm, D10=2-4μm, D90=20-23μm. After drying the vanadium-chromium alloy powder and the gas atomized iron-cobalt alloy powder are mixed with a three-dimensional mixer for 12h to obtain an iron-cobalt-vanadium-chromium alloy powder. The elemental ratio of the iron-cobalt-vanadium-chromium alloy powder is shown in Table 2.

[0055] Table 2 Elemental powder ratio

[0056] Element Fe Co V Cr Content 49％ 49％ 1.8％ 0.2％ Actual weight 4410g 4410g 162g 18g

[0057] (2) Preparation of high elongation iron-cobalt-vanadium alloy feedstock

[0058] In order to ensure the safety of the process and prevent the oxidation of part of the alloy powder, the process needs to be protected by argon positive pressure, with a pressure of 1.2atm.

[0059] Put the iron-cobalt-vanadium-chromium alloy powder 9000g into the mixing cavity of the mixer, then introduce argon into the mixing cavity, set the heating temperature to 180℃ for 15 minutes, then add polyformaldehyde 800g, lubricant 150g and antioxidant 50g, mix for 45 minutes, then cut the particles and cool to obtain the iron-cobalt-vanadium alloy feedstock.

[0060] The ratio of the iron-cobalt-vanadium-chromium alloy powder to polyformaldehyde, lubricant and antioxidant is as follows (mass percentage):

[0061] (A) Iron-cobalt-vanadium-chromium alloy powder: 90%;

[0062] (B) Polyformaldehyde: 8%, copolymer type FF520;

[0063] (C) Lubricant: 1.5%, stearic acid;

[0064] (D) Antioxidant: 0.5%, BASF B215.

[0065] (3) Preparation of high elongation iron-cobalt-vanadium alloy material

[0066] The processed iron-cobalt-vanadium alloy feedstock is injection molded, with a material temperature of 180-190℃, an injection pressure of 80-120MPa, a holding pressure time of 20-30s, and a mold temperature of 100℃. After injection molding, the workpiece is placed on a ceramic plate and then placed in a debinding furnace for debinding.

[0067] The debinding temperature is set to 110℃, the nitrogen flow rate is 60L / min, the nitric acid amount is 240g / h, and the debinding time is 8-10h to ensure that the debinding meets the standard. After completion, the debound part is placed in a sintering furnace for sintering.

[0068] Sintering process In order to make the iron-cobalt-vanadium powder particles reach higher densification, the sintering temperature is set to 1380°C and the holding time is 180 minutes. Argon gas protection is used in the sintering process, and a partial pressure of 50 KPa is adopted to prevent metal evaporation during sintering. Due to the addition of trace chromium in the powder, the powder obtains a certain liquid phase, and the final densification is higher than that of conventional iron-cobalt-vanadium sintered parts.

[0069] The sintered part is placed in a vacuum heat treatment furnace, and the vacuum degree is set to 10 -1 pa, and heated to 800°C at a rate of 3°C / min, and held for 60 min to ensure uniform heating of the sintered part in each area of the furnace. Then it is heated to 1050°C at a rate of 5°C / min, and held for 90 min to ensure complete dissolution of the iron-cobalt-vanadium precipitated phase. Finally, it is cooled to room temperature at a cooling rate of 5-6 atm and 50°C / min to obtain a high-elongation iron-cobalt-vanadium alloy material workpiece.

[0070] Example 3

[0071] (1) Preparation of iron-cobalt-vanadium-chromium alloy powder

[0072] Take water atomized vanadium powder 216g, powder particle size D50=8-10μm; take another chromium powder 24g, powder particle size D50=5-7μm; put them into a mixing barrel, use a centrifugal high-speed ball mill to high-speed ball mill for 24h, after the two powders are fully mixed, vanadium-chromium alloy powder is obtained, which is beneficial to reducing organizational segregation during later sintering. Dry the vanadium-chromium alloy powder for 10h, and store the dried vanadium-chromium alloy powder under vacuum condition for standby.

[0073] Take gas atomized iron-cobalt alloy powder 11760g, powder particle size D50=8-10μm, D10=2-4μm, D90=20-23μm. Mix the dried vanadium-chromium alloy powder with the gas atomized iron-cobalt alloy powder with a three-dimensional mixer for 12h to obtain iron-cobalt-vanadium-chromium alloy powder. The elemental ratio of the iron-cobalt-vanadium-chromium alloy powder is as shown in Table 3.

[0074] Table 3 Elemental powder ratio

[0075] Element Fe Co V Cr Content 49％ 49％ 1.8％ 0.2％ Actual weight 5880g 5880g 216g 24g

[0076] (2) Preparation of high-elongation iron-cobalt-vanadium alloy feedstock

[0077] In order to ensure the safety of the process and prevent oxidation of part of the alloy powder, argon gas overpressure protection is required during processing, with a pressure of 1.2 atm.

[0078] Put the iron cobalt-vanadium chromium alloy powder 8700 g into the mixing cavity of the mixer, then put argon into the mixing cavity, set 180 ℃ heating for 15 minutes, then add polyformaldehyde 1000 g, lubricant 280 g and antioxidant 20 g, cut the particles after mixing for 45 minutes, and cool to get the iron cobalt-vanadium alloy feedstock.

[0079] The ratio of iron cobalt-vanadium chromium alloy powder, polyformaldehyde, lubricant and antioxidant is as follows (mass percentage) :

[0080] (A) Iron cobalt-vanadium chromium alloy powder: 87%;

[0081] (B) Polyformaldehyde: 10%, copolymer type FF520;

[0082] (C) Lubricant: 2.8%, zinc stearate;

[0083] (D) Antioxidant: 0.2%, BASF B215.

[0084] (3) Preparation of high elongation iron cobalt-vanadium alloy material

[0085] The processed iron cobalt-vanadium alloy feedstock is injection molded, the material temperature is set to 180-190 ℃, the injection pressure is 80-120 MPa, the holding time is 20-30 s, and the mold temperature is 100 ℃. After injection molding, the workpiece is placed on a ceramic plate and then put into a degreasing furnace for degreasing.

[0086] The degreasing temperature is set to 110 ℃, the nitrogen flow is 60 L / min, the nitric acid amount is 240 g / h, the degreasing time is 8-10 h, and the degreasing is ensured to meet the standard. After completion, the degreased part is put into a sintering furnace for sintering.

[0087] In order to make the iron cobalt-vanadium powder particles achieve high densification, the sintering temperature is set to 1380 ℃ and the holding time is 180 minutes, argon protection is used during sintering, and a 50 KPa partial pressure is adopted to prevent metal evaporation during sintering. Due to the addition of trace chromium in the powder, the powder obtains a certain liquid phase, and the final densification is higher than that of conventional iron cobalt-vanadium sintered parts.

[0088] Put the sintered part into a vacuum heat treatment furnace, set the vacuum degree to 10 -1 pa, heat to 800 ℃ at a rate of 3 ℃ / min, hold for 60 min to ensure uniform heating of the sintered part in each area of the furnace, then heat to 1050 ℃ at a rate of 5 ℃ / min, hold for 90 min to ensure complete dissolution of the iron cobalt-vanadium precipitated phase, finally set the cooling rate to 5-6 atm, 50 ℃ / min to room temperature, and get the high elongation iron cobalt-vanadium alloy material workpiece.

[0089] Example 4

[0090] Three high-elongation FeCo2V alloy material workpieces were prepared by the above method, the high-elongation FeCo2V workpiece prepared in Example 2 was tested together with a conventional FeCo2V alloy material workpiece by using a mechanical property testing conventional testing machine, and the results are shown in Table 4 and Figures 1-2

[0091] Table 4 Mechanical property testing results

[0092]

[0093] As can be seen from Table 4 and Figures 1-2 the strength of the two groups of test samples has little difference, but the high-elongation FeCo2V workpiece has an average elongation of 3.09%, which is more than 50% higher than the average elongation of 1.88% of the conventional FeCo2V, and as a brittle MIM workpiece, it can be completely shaped to improve the process yield.

[0094] In the present application, the vanadium powder and the chromium powder are obtained by high-speed planetary ball milling to obtain uniform premixed powder, which provides guarantee for subsequent sintering organization consistency and reduces the traditional FeCo2V sintering organization segregation phenomenon; by adding a small amount of fine chromium powder to FeCo2V, the sintering densification is improved, and the mechanical properties are improved; by increasing the special heat treatment process, the precipitated phase is reduced, the grain is refined, and the performance is improved again, so that the elongation of the workpiece is more than 50% higher than that of the conventional FeCo2V material; the problem of low elongation in the traditional process is solved, and the MIM process batch production of high-performance magnetic components is suitable.

[0095] The high-elongation FeCo2V alloy feedstock of the present application comprises 5-10% polyformaldehyde, 1-3% lubricant, 0.1-1% antioxidant, and 87-93% FeCo-V-Cr alloy powder, wherein the FeCo-V-Cr alloy powder comprises Fe 49%, Co 49%, V 1.8%, and Cr 0.2%. The present application improves the sintering process matrix FeCo alloy organization by adding trace amounts of chromium, and reduces the precipitation of unstable phases by solid solution process. The addition of trace amounts of chromium improves the elongation of FeCo2V, so that the alloy can be used to produce complex powder injection molding structural parts and can be shaped, reducing the risk of processing fracture.

[0096] The above is only a preferred embodiment of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.​

Claims

1. A high elongation Fe-Co-V alloy feedstock, characterized in that, By mass percentage, it comprises: polyformaldehyde 5-10%, lubricant 1-3%, antioxidant 0.1-1%, iron-cobalt-vanadium-chromium alloy powder 87-93%.

2. The feed of claim 1, wherein, By mass percentage, it comprises: polyformaldehyde 8%, lubricant 1.5%, antioxidant 0.5%, iron-cobalt-vanadium-chromium alloy powder 90%, wherein the iron-cobalt-vanadium-chromium alloy powder comprises Fe 49%, Co 49%, V 1.8%, and Cr 0.2% by mass percentage.

3. The feed according to any one of claims 1 or 2, characterized in that, The polyformaldehyde is copolymer type FF520, the antioxidant is BASF B215, and the lubricant is stearic acid, magnesium stearate, or zinc stearate.

4. A method of processing a high-elongation Fe-Co-V alloy, characterized by, The method comprises the following steps: Iron-cobalt alloy powder, vanadium powder, and chromium powder are taken and mixed to obtain iron-cobalt-vanadium-chromium alloy powder; The iron-cobalt-vanadium-chromium alloy powder, polyformaldehyde, lubricant, and antioxidant are mixed and cooled to obtain iron-cobalt-vanadium alloy feedstock; The iron-cobalt-vanadium alloy feedstock is injection molded, and the green body is obtained after cooling and solidification.

5. The method of claim 4, wherein, The method further comprises: The green body is debound at 110°C for 8-10h, acid is added at 240g / h during the debinding process, and argon is filled at 60L / min to obtain the debound green body; The debound green body is sintered at 1380°C for 180min, argon protection is adopted during the sintering process, and a 50Kpa partial pressure is set to obtain a sintered part; The sintered part is heated to 800°C at a rate of 3°C / min in a vacuum of 10 -1 The temperature is raised to 800°C at a rate of 3°C / min, held for 60 min, then raised to 1050°C at a rate of 5°C / min, held for 90 min, and finally cooled to room temperature at a rate of 50°C / min under 5-6 atm.

6. The method according to any of claims 4 or 5, characterized in that, The preparation method of the iron-cobalt-vanadium-chromium alloy powder comprises: Water-atomized vanadium powder and chromium powder are taken, mixed at a mass ratio of 9:1, and ball milled for 24h to obtain vanadium-chromium alloy powder; The vanadium-chromium alloy powder is dried, mixed with gas-atomized iron-cobalt alloy powder at a mass ratio of 1:49 for 12h to obtain the iron-cobalt-vanadium-chromium alloy powder.

7. The method of claim 6, wherein, The powder particle size of the water-atomized vanadium powder is D50=8-10μm, the powder particle size of the chromium powder is D50=5-7μm, and the powder particle size of the gas-atomized iron-cobalt alloy is D50=8-10μm, D10=2-4μm, and D90=20-23μm.

8. The method of claim 4, wherein, The specific method of the mixing comprises: The iron-cobalt-vanadium-chromium alloy powder is added to a mixing cavity, argon is introduced into the mixing cavity, heated at 180°C for 15min, then polyformaldehyde, lubricant, and antioxidant are added, mixed for 45min, cut into particles, and cooled to obtain iron-cobalt-vanadium alloy feedstock.

9. The method of claim 4, wherein, By mass percentage, it comprises polyformaldehyde 8%, lubricant 1.5%, antioxidant 0.5%, and iron-cobalt-vanadium-chromium alloy powder 90%.

10. The method according to any of claims 4 or 9, characterized in that, The polyformaldehyde is copolymer type FF520, the antioxidant is BASF B215, and the lubricant is stearic acid, magnesium stearate, or zinc stearate.

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