Preparation method of SmFe12-based permanent magnet alloy with low rare earth content and high performance

Abstract

The invention relates to a preparation method of a low-rare-earth and high-performance SmFe12-based permanent magnet alloy. The preparation method comprises the following steps: proportioning elementary substance raw materials according to the proportion of Sm < 0.75 + x > Zr < 0.25 > Fe < 8.8 + y > Co < 2.2 + z > Ti < 1 + m > B < n >, and then preparing the SmFe12-based permanent magnet alloy through the steps of electric arc melting, melt rapid quenching, heat treatment and the like. According to the invention, Zr, Co, Ti and B elements are introduced into the SmFe12-based permanent magnet alloy, so that the permanent magnet alloy has lower rare earth content and minimum loss of ferromagnetic element content, the utilization rate and high-valued level of rare earth elements are improved, the generation of alpha-Fe phase is effectively inhibited, a better phase composition structure is obtained, the balance between coercive force and residual magnetism is realized, and the coercive force and residual magnetism are improved. The SmFe12-based permanent magnet alloy has excellent magnetic performance, the coercive force of the SmFe12-based permanent magnet alloy reaches 8.78 kOe, and the maximum magnetic energy product of the SmFe12-based permanent magnet alloy is 71 kJ / m.

Description

TECHNICAL FIELD

[0001] The application relates to a preparation method of a low-rare earth and high-performance SmFe 12 The application relates to a preparation method of a low-rare earth and high-performance SmFe BACKGROUND

[0002] With the continuous advancement of the modernization process, the application and development of magnetic materials in the fields of new energy vehicles, wind power generation and communication are also rapidly rising. As a rare earth permanent magnet material with great application potential, ThMn 12 SmFe 12 Based permanent magnet material is well-known for low rare earth content, high intrinsic magnetic performance and high Curie temperature. At present, in the research on ThMn 12 Nanocrystalline permanent magnet alloy, more attention is paid to reducing the content of Fe and Co elements and adding non-magnetic elements such as Ti, V, Si and Al to realize high coercivity. However, this method not only greatly reduces the remanence and saturation magnetization, destroys the balance between coercivity and remanence, but also is not conducive to the improvement of coercivity due to the precipitation of a large amount of alpha-Fe phase in the preparation process.

[0003] In view of the above situation, the application provides a preparation method of a low-rare earth and high-performance SmFe 12 Based permanent magnet alloy, which effectively controls the phase composition and microstructure of the alloy by adopting a non-stoichiometric composition design, introducing excessive Fe, Co and Ti elements and combining B element doping, so as to significantly inhibit the precipitation of alpha-Fe phase and improve the coercivity of the alloy. 12 The SmFe 12 Based permanent magnet alloy prepared by the method has excellent magnetic performance, the coercivity reaches 8.78 kOe, and the maximum magnetic energy product is 71 kJ / m³. The application improves the utilization rate and high value level of rare earth elements, realizes the balanced utilization of rare earth resources, and also provides an important technical path and theoretical basis for developing transition metal-based permanent magnet materials with higher magnetic performance. SUMMARY

[0004] In view of the problems of high alpha-Fe phase content and low coercivity in the SmFe 12 Based permanent magnet alloy, the application provides a preparation method of a low-rare earth and high-performance SmFe 12 Based permanent magnet alloy, so as to save rare earth resources, reduce the production cost of the magnet and effectively improve the magnetic performance of the magnet.

[0005] The application relates to a preparation method of a low-rare earth and high-performance SmFe 12 Based permanent magnet alloy, so as to save rare earth resources, reduce the production cost of the magnet and effectively improve the magnetic performance of the magnet. 12In the base permanent magnetic alloy, the phase composition and microstructure of the permanent magnetic alloy are controlled, the alpha-Fe impurity phase is inhibited, and the coercivity is improved, and the specific steps are as follows: Step 1: batching According to the chemical formula Sm 0.75+x Zr 0.25 Fe 8.8+y Co 2.2+z Ti 1+m B n , the elemental raw materials of Sm, Zr, Fe, Co, Ti and B are batched in the ratio of x: y: z: m: n; wherein x is 0~0.3, y is 0~0.8, z is 0~0.2, m is 0~0.4, and n is 0~2; Step 2: arc melting The zirconium ingot and the batch of step 1 are respectively placed in the melting furnace, the tungsten needle is installed at a position not less than 1~2 mm of the batch stacking height, the vacuum is extracted to 4.0*10 -3 Pa, and then 1 atmosphere of argon gas is filled into the furnace; During the melting process, the zirconium ingot is first melted for 1 minute to remove the residual oxygen in the furnace, and then the batch is repeatedly melted for 6 times with a current of 120A or more, and after the metal liquid is cooled, the alloy ingot is obtained; Step 3: melt quenching After the alloy ingot is polished to remove the surface oxidation layer, it is cut into small pieces and placed in a quartz tube, and then placed in a melting furnace, the vacuum degree is extracted to 2.0*10 -3 Pa, and then argon gas is filled into the furnace; after the alloy ingot in the quartz tube is melted by high-frequency induction heating, it is blown onto the copper roller by argon gas, and the alloy thin strip is obtained; wherein the linear speed of the copper roller is adjusted to 25~40m / s; Step 4: vacuum tube sealing treatment The alloy thin strip is placed in a quartz tube, and the inside of the quartz tube is subjected to 5 times of argon gas charging and discharging treatment, and then vacuum extraction is performed to 3*10 -3 Pa, and finally the opening end of the quartz tube is burned to close the tube by acetylene flame; Step 5: heat treatment After the temperature in the furnace is heated to 800℃, the sealed quartz tube is placed in the furnace, and after heat preservation for 5~30min, the quartz tube is quickly transferred to water for rapid cooling, and the SmFe 12 base permanent magnetic alloy thin strip is obtained.

[0006] The purity of the elemental raw material is not less than 99.95%.

[0007] The purity of the argon gas is 99.99%.

[0008] The present application has the following advantages: the Zr, Co, Ti and B elements are introduced into the SmFe 12In the base permanent magnet alloy, the problem of mutual offsetting of increasing the content of one element and decreasing the content of another element is avoided, so that the permanent magnet alloy has a lower content of rare earth elements, and the content of ferromagnetic elements is minimized, the utilization rate and high value level of rare earth elements are improved. In addition, the generation of alpha-Fe phase is effectively inhibited by adjusting the composition and process, a better phase composition structure is obtained, the balance between coercivity and remanence is realized, and the SmFe 12 The base permanent magnet alloy has excellent magnetic properties, the coercivity reaches 8.78 kOe, and the maximum magnetic energy product is 71 kJ / m³. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 The SmFe 0.75+x Zr 0.25 Fe 8.8+y Co 2.2+z Ti 1+m B n alloy thin strip prepared in Example 1 of the present application is shown in the figure. Wherein: x=0.15, y=0.8, z=0.1, m=0.4, n=0. Figure 2 The SmFe 0.75+x Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B n alloy thin strip prepared in Example 2 of the present application is shown in the figure. Wherein: x=0.15, n=0.5. Figure 3 The SmFe 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.1 and Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.3 alloy thin strip prepared in Example 3 of the present application is shown in the figure. Figure 4 The process flow chart of the preparation method of the present application is shown in the figure. DETAILED DESCRIPTION

[0010] Example 1 Preparation of Sm 0.9 Zr0.25 Fe 9.6 Co 2.3 Ti 1.4 permanent magnetic alloy Step 1: ingredient According to the chemical formula of the alloy ingot Sm 0.75+x Zr 0.25 Fe 8.8+y Co 2.2+z Ti 1+m B n (Wherein x=0.15, y=0.8, z=0.1, m=0.4, n=0), respectively, Sm 1.81g, Zr 0.31g, Fe 7.17g, Co 1.81g and Ti 0.9g were weighed for raw material ingredient.

[0011] Step 2: arc melting The ingredients and zirconium ingot were respectively put into the melting furnace, the tungsten needle was installed at a position not less than 1~2 mm of the ingredient stack height, the vacuum was extracted to 4.0×10 -3 Pa, and then 1 atmosphere of argon was filled into the furnace; during the melting process, the zirconium ingot was first melted for 1 minute to remove the residual oxygen in the furnace, and then the ingredients were repeatedly melted 6 times with a current of 120A or more, and after the metal liquid cooled, Sm 0.9 Zr 0.25 Fe 9.6 Co 2.3 Ti 1.4 alloy ingot was obtained.

[0012] Step 3: melt quenching After the alloy ingot was polished to remove the surface oxidation layer, it was cut into small pieces and placed in a quartz tube, and then installed in the melting furnace, the vacuum degree was extracted to 2.0×10 -3 Pa, and then argon was filled into the furnace; after the alloy ingot in the quartz tube was heated to melting by high-frequency induction, it was blown onto the copper roller by argon to obtain alloy thin strips; wherein the linear speed of the copper roller was 40m / s.

[0013] Step 4: vacuum tube sealing treatment The alloy thin strips were placed in a quartz tube, and the inside of the quartz tube was subjected to 5 times of argon filling and discharging treatment, and then vacuum extraction to 3×10 -3 Pa, and finally the opening end of the quartz tube was burned to close the tube with acetylene flame.

[0014] Step 5: heat treatment After the temperature in the furnace was heated to 800℃, the sealed quartz tube was put in, and after 5min of heat preservation, the quartz tube was quickly transferred to water for rapid cooling, and Sm 0.9 Zr 0.25 Fe 9.6 Co2.3 Ti 1.4 Permanent magnetic alloy.

[0015] Comparative Example 1 Preparation of Sm 0.9 Zr 0.25 Fe 8.8 Co 2.2 Ti permanent magnetic alloy Step 1: batching According to the chemical formula of the alloy ingot Sm 0.75+x Zr 0.25 Fe 8.8+y Co 2.2+z Ti 1+m B n (wherein x = 0.15, y = 0, z = 0, m = 0, n = 0), respectively, Sm 1.96g, Zr 0.33g, Fe 7.13g, Co 1.88g and Ti 0.69g were weighed for raw material batching.

[0016] Step 2: arc melting The batching and zirconium ingot were respectively placed in the melting furnace, the tungsten needle was installed at a position not less than 1~2 mm of the batching stack height, the vacuum was extracted to 4.0×10 -3 Pa, and then 1 atmosphere of argon was filled into the furnace; during the melting process, the zirconium ingot was first melted for 1 minute to remove the residual oxygen in the furnace, and then the batching was repeatedly melted 6 times with a current of 120A or more, and after the metal liquid cooled, Sm 0.9 Zr 0.25 Fe 8.8 Co 2.2 Ti alloy ingot was obtained.

[0017] Step 3: melt quenching After the alloy ingot was polished to remove the surface oxide layer, it was cut into small pieces and placed in a quartz tube, and then installed in the melting furnace, the vacuum degree was extracted to 2.0×10 -3 Pa, and then argon was filled into the furnace; after the alloy ingot in the quartz tube was heated to melting by high-frequency induction, it was blown onto the copper roller by means of argon to obtain alloy thin strips; wherein the linear speed of the copper roller was 40m / s.

[0018] Step 4: vacuum tube sealing treatment The alloy thin strips were placed in a quartz tube, and the inside of the quartz tube was subjected to 5 times of argon filling and discharging treatment, and then vacuumed to 3×10 -3 Pa, and finally the opening end of the quartz tube was burned to close the tube with acetylene flame.

[0019] Step 5: heat treatment After the furnace temperature is heated to 800 DEG C, the sealed tube is put into the quartz tube, and after 5 minutes of heat preservation, the quartz tube is quickly transferred to water for rapid cooling, to obtain Sm 0.9 Zr 0.25 Fe 8.8 Co 2.2 Ti permanent magnet alloy.

[0020] Compared with the Sm 0.9 Zr 0.25 Fe 8.8 Co 2.2 Ti permanent magnet alloy, by adjusting the composition, the content of Ti element is increased to 1.4 at.%, and Sm 0.9 Zr 0.25 Fe 9.6 Co 2.3 Ti 1.4 Permanent magnet alloy. Combined with Table 1 and Figure 1 It can be seen that with the increase of the content of Ti element, the coercive force of the alloy is significantly increased from 3.25 kOe to 6.4 kOe, and the increase is as high as 97%. The remanence is only slightly reduced. The above results show that appropriately increasing the atomic proportion of Ti element can significantly increase the coercive force while minimizing the loss of remanence, which provides a clear composition control direction for the performance optimization of the permanent magnet alloy.

[0021] The method adopted in the application effectively improves the magnetic properties of the alloy. The coercive force is improved while the loss of remanence is as low as possible, as shown in Table 1.

[0022] ;

[0023] Example 2 Preparation of Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.5 Permanent magnet alloy Step 1: batching According to the chemical general formula Sm 0.75+x Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B n (wherein x=0.15, n=0.5), Sm1.91g, Zr0.32g, Fe6.92g, Co1.83g, Ti0.94g and B0.08g are weighed respectively for raw material batching.

[0024] Step 2: Arc melting The ingredients and zirconium ingot are respectively placed in a melting furnace, a tungsten needle is installed at a position of 1-2 mm higher than the height of the ingredient stack, vacuum is extracted to 4.0x10 -3 Pa, and 1 atmosphere of argon is filled into the furnace; during the melting process, the zirconium ingot is first melted for 1 minute to remove residual oxygen in the furnace, and then the ingredients are repeatedly melted 6 times with a current of 120A or more, and after the metal liquid is cooled, the Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.5 alloy ingot is obtained.

[0025] Step 3: melt quenching After the alloy ingot is polished to remove the surface oxide layer, it is cut into small pieces and placed in a quartz tube, which is then installed in a melting furnace, and the vacuum degree is extracted to 2.0x10 -3 Pa, and then argon is filled into the furnace; after the alloy ingot in the quartz tube is melted by high-frequency induction heating, it is blown onto a copper roller by argon to obtain an alloy thin strip; wherein the linear speed of the copper roller is 25 m / s.

[0026] Step 4: vacuum tube sealing treatment The alloy thin strip is placed in a quartz tube, and the inside of the quartz tube is subjected to 5 times of argon filling and discharging treatment, and then vacuum is extracted to 3x10 -3 Pa, and finally the opening end of the quartz tube is burned to close the tube with an acetylene flame.

[0027] Step 5: heat treatment After the temperature in the furnace is heated to 800℃, the sealed quartz tube is placed in, and after heat preservation for 30 minutes, the quartz tube is quickly transferred to water for rapid cooling to obtain a Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.5 permanent magnet alloy.

[0028] Comparative Example 2 Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 alloy Step 1: ingredient preparation According to the chemical formula Sm 0.75+x Zr 0.25 (Fe0.8 Co 0.2 ) 11 Ti 1.4 B n (where x=0.15, n=0), weigh out 1.92g of Sm, 0.32g of Zr, 6.97g of Fe, 1.84g of Co, 0.95g of Ti, and 0g of B respectively for raw material preparation.

[0029] Step 2: Arc melting The raw materials and zirconium ingots are placed separately into the melting furnace. Tungsten needles are installed at a position no less than 1-2 mm above the stacking height of the raw materials, and a vacuum of 4.0 × 10⁻⁶ is applied. -3 Pa, then argon gas at 1 atmosphere is introduced into the furnace; during the smelting process, the zirconium ingot is first melted for 1 minute to remove residual oxygen in the furnace, and then the batching is repeatedly smelted 6 times with a current of 120A or higher. After the molten metal cools, Sm is obtained. 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 Alloy ingots.

[0030] Step 3: Rapid quenching of the melt After grinding to remove the surface oxide layer, the alloy ingot is cut into small pieces and placed in a quartz tube. The tube is then installed in a melting furnace, and the vacuum level is raised to 2.0 × 10⁻⁶. -3 Pa, then argon gas is introduced into the furnace; the alloy ingot in the quartz tube is heated by high-frequency induction heating until it melts, and then blown onto the copper roller with argon gas to obtain Sm. 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 Alloy; wherein the linear speed of the copper roller is 25 m / s.

[0031] Compared to Sm in Comparative Example 2 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 In Example 2, Sm was prepared by adjusting the atomic percentage of element B (increasing it from 0 at.% in Comparative Example 2 to 0.5 at.%) and placing it in a vacuum furnace preheated to 800°C for 30 min, followed by rapid water cooling. 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.5Permanent magnetic alloy. In combination with Table 2 and Figure 2 The results show that on the basis of Comparative Example 2, a small amount of B element is introduced, and appropriate heat treatment is carried out, and the performance shows significant changes: the coercive force is greatly increased from 5.46 kOe to 8.78 kOe, with an increase of 60%, and the remanence is only reduced by 5%.

[0032] By Figure 2 It can be shown that the method adopted by the present application can effectively improve the magnetic properties of the alloy. The coercive force is greatly improved while the loss of remanence is as low as possible, as shown in Table 2.

[0033] ;

[0034] Example 3 Preparation of Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.1 alloy Step 1: batching According to the chemical formula of the alloy ingot Sm 0.75+x Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B n (wherein x=0.15, n=0.1), Sm1.92g, Zr0.32g, Fe6.96g, Co1.84g, Ti0.95g, B0.02g are weighed respectively for raw material batching.

[0035] Step 2: arc melting The batching and zirconium ingot are respectively put into the melting furnace, the tungsten needle is installed at a position not lower than 1~2 mm of the stacking height of the batching, vacuum is extracted to 4.0×10 -3 Pa, and then 1 atmosphere of argon is filled into the furnace; during the melting process, the zirconium ingot is first melted for 1 minute to remove the residual oxygen in the furnace, and then the batching is repeatedly melted 6 times with a current of 120A or more, and after the metal liquid is cooled, the Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.1 alloy ingot is obtained.

[0036] Step 3: melt quenching The alloy ingot is cut into small pieces after removing the surface oxidation layer by polishing, and is placed in a quartz tube, and then is installed in a melting furnace, and the vacuum degree is extracted to 2.0*10 -3 Pa, and argon gas is filled into the furnace; after the alloy ingot in the quartz tube is heated to melting by high-frequency induction, it is blown onto the copper roller by means of argon gas, and Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.1 alloy; wherein the linear speed of the copper roller is 25 m / s.

[0037] Comparative Example 3 Preparation of Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.3 permanent magnet alloy Step 1: batching According to the chemical formula Sm 0.75+x Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B n (wherein x=0.15, n=0.3), Sm1.91g, Zr0.32g, Fe6.94g, Co1.83g, Ti0.95g, and B0.05g are respectively weighed for raw material batching.

[0038] Step 2: arc melting The batching and zirconium ingot are respectively placed in a melting furnace, a tungsten needle is installed at a position not lower than 1~2 mm of the height of the batching stack, the vacuum is extracted to 4.0*10 -3 Pa, and 1 atmosphere of argon gas is filled into the furnace; during the melting process, the zirconium ingot is first melted for 1 minute to remove residual oxygen in the furnace, and then the batching is repeatedly melted 6 times by a current of 120A or more, and after the metal liquid is cooled, Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.3 alloy ingot is obtained.

[0039] Step 3: melt quenching The alloy ingot is cut into small pieces after removing the surface oxidation layer by polishing, and is placed in a quartz tube, and then is installed in a melting furnace, and the vacuum degree is extracted to 2.0*10-3 Pa, and then argon gas was filled into the furnace; the alloy ingot in the quartz tube was heated to melting by high-frequency induction, and then blown onto a copper roller by argon gas to obtain an alloy thin strip; wherein the linear speed of the copper roller was 25 m / s.

[0040] Step 4: vacuum sealing tube treatment The alloy thin strip was placed in a quartz tube, and the inside of the quartz tube was subjected to 5 times of argon gas filling and discharging treatment, and then vacuumized to 3x10 -3 Pa, and finally the opening end of the quartz tube was burned to close the tube by an acetylene flame.

[0041] Step 5: heat treatment After the temperature in the furnace was heated to 800 DEG C, the sealed quartz tube was put in, and after heat preservation for 30 min, the quartz tube was quickly transferred to water for rapid cooling to obtain a Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.3 permanent magnet alloy.

[0042] Compared with the Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.3 permanent magnet alloy of Comparative Example 3, the Sm 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.1 permanent magnet alloy of Example 3 was prepared by reducing the content of B element (from 0.3 at.% of the comparative example to 0.1 at.%) and without 800 DEG C / 30 min heat treatment. 0.9 Zr 0.25 (Fe 0.8 Co 0.2 ) 11 Ti 1.4 B 0.1 permanent magnet alloy. It can be seen from Table 3 and Figure 3 It can be seen that the proportion of the 1:12 main phase in Example 3 is obviously improved, and the content of the alpha-Fe phase is obviously reduced from 14.19 VoL.% to 0.18 VoL.%, which indicates that by reducing the content of B element in Comparative Example 3, the precipitation of alpha-Fe can be significantly inhibited without subsequent heat treatment, which creates favorable conditions for improving the coercive force.

[0043] The method adopted in the application can effectively inhibit the precipitation of alpha-Fe, as shown in Figure 3 and Table 3.

[0044] .

Claims

1. A low rare earth and high performance SmFe 12 A method for producing a low rare earth and high performance SmFe The preparation method is to introduce Zr, Co, Ti and B elements into SmFe 12 The application relates to a method for preparing a SmFe 12 magnetic alloy, and the method comprises the following steps: Step 1: ingredient preparation According to the chemical formula Sm 0.75+x Zr 0.25 Fe 8.8+y Co 2.2+z Ti 1+m B n The elemental raw materials of Sm, Zr, Fe, Co, Ti and B are proportioned according to the ratio of the chemical formula Sm x y z m n ; wherein, x is 0~0.3, y is 0~0.8, z is 0~0.2, m is 0~0.4, and n is 0~2. Step 2: arc melting The zirconium ingot and the ingredients of step 1 are respectively put into a smelting furnace, a tungsten needle is installed at a position not lower than 1-2 mm of the height of the ingredient stack, vacuum is extracted to 4.0 x 10 -3 Pa, and 1 atmosphere of argon is filled into the furnace again; During the melting process, the zirconium ingot is first melted for 1 minute to remove residual oxygen in the furnace, and then the ingredient is repeatedly melted for 6 times with a current of 120A or more. After the metal liquid is cooled, the alloy ingot is obtained; Step 3: melt quenching After the alloy ingot is polished to remove the surface oxide layer, the alloy ingot is cut into small pieces and placed in a quartz tube, and then placed in a melting furnace, and the vacuum degree is pumped to 2.0*10 -3 Pa, and argon gas is filled into the furnace; after the alloy ingot in the quartz tube is heated by high-frequency induction to be melted, the alloy thin strip is obtained by blowing the argon gas onto the copper roller; wherein the linear speed of the copper roller is adjusted to 25~40m / s; Step 4: vacuum tube sealing treatment The alloy ribbon was placed in a quartz tube, and the inside of the quartz tube was subjected to 5 argon gas charging and discharging treatments, and then vacuumized to 3 x 10 -3 Pa, and finally the opening end of the quartz tube was burned to be closed by an acetylene flame. Step 5: heat treatment After the furnace temperature is heated to 800℃, the sealed tube is put into the quartz tube, and after 5-30 min of heat preservation, the quartz tube is quickly transferred to water for rapid cooling to obtain SmFe 12 based permanent magnet alloy ribbons.

2. A low rare earth and high performance SmFe 12 A method for preparing a permanent magnet alloy based on SmFe The purity of the single element raw material is not less than 99.95%.

3. A low rare earth and high performance SmFe 12 A method for preparing a permanent magnet alloy based on SmFe The purity of the argon gas is 99.99%.

Images