CN112679206B - High-structural-strength permanent magnetic ferrite magnetic shoe and preparation method thereof - Google Patents
High-structural-strength permanent magnetic ferrite magnetic shoe and preparation method thereof Download PDFInfo
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Abstract
The application relates to the field of permanent magnetic ferrite materials, and particularly discloses a permanent magnetic ferrite magnetic shoe with high structural strength and a preparation method thereof, wherein the magnetic shoe is prepared from the following components in parts by weight: the main components are as follows: 70-90 parts of iron oxide red and 10-20 parts of strontium carbonate; auxiliary components: 6-13 parts of aluminum oxide, 0.8-1.2 parts of calcium carbonate and 0.2-0.5 part of silicon dioxide; auxiliary agent: 1-3 parts of triethanolamine and 1-3 parts of sorbitol; the preparation method comprises the following steps: weighing the main component and the auxiliary component according to the weight parts, and ball-milling; firstly adding sorbitol and uniformly mixing; and adding triethanolamine, uniformly mixing, settling, preparing a blank, and sintering at 1200-1260 ℃ to obtain the permanent magnetic ferrite magnetic shoe. The magnetic shoe has high Br and tensile strength; in addition, according to the preparation method, the sorbitol is added firstly, and then the triethanolamine is added, so that the ferrite particles are uniformly distributed, and the structural strength of the magnetic shoe is improved.
Description
Technical Field
The application relates to the field of permanent magnetic ferrite materials, in particular to a permanent magnetic ferrite magnetic shoe with high structural strength and a preparation method thereof.
Background
The permanent magnetic ferrite material has wide raw material source, low price and excellent magnetic property, and plays an important role in the research and development of magnetic materials; the magnetic shoe on the permanent magnet motor is made of permanent ferrite material; at present, the permanent magnet motor is widely applied to the fields of household appliances, automobiles, computers, communication and the like; the parameters of the permanent magnetic ferrite material such as residual magnetization (Br), intrinsic coercive force (Hcj) and the like have important influence on the performance of the magnetic shoe.
The chinese patent with publication number CN103771882B discloses a permanent magnetic ferrite, a manufacturing method thereof and an ultra-thin permanent magnetic ferrite magnetic shoe, wherein the permanent magnetic ferrite comprises the following components by weight percent: 81-88 parts of ferric oxide, 12-19 parts of strontium carbonate, 1.2-5.5 parts of lanthanum oxide, 0.6-0.8 part of cobalt oxide, 1.5-4 parts of calcium carbonate and 0.3-1.0 part of silicon dioxide, and the magnetic tile prepared from the components has high Hcj and excellent structural strength.
In the above related art, the amount of calcium carbonate added is 1.27% to 4.14%, and the inventors consider that the following technical drawbacks exist: when the addition amount of the calcium carbonate exceeds 1.4 percent, more carbon dioxide is generated by decomposing the calcium carbonate, more air holes are easily formed on the magnetic tile, and the compactness of the magnetic tile is influenced, so that the Br of the magnetic tile is reduced.
Disclosure of Invention
In order to solve the problem that the Br of the magnetic shoe is reduced due to excessive addition of carbon dioxide, the application provides a permanent magnetic ferrite magnetic shoe with high structural strength and a preparation method thereof.
The application provides a permanent magnetic ferrite magnetic shoe with high structural strength and a preparation method thereof, which adopts the following technical scheme:
in a first aspect, the application provides a permanent magnetic ferrite magnetic shoe with high structural strength, which adopts the following technical scheme:
a permanent magnetic ferrite magnetic shoe with high structural strength is prepared from the following components in parts by weight:
the main components are as follows: 70-90 parts of iron oxide red and 10-20 parts of strontium carbonate;
auxiliary components: 6-13 parts of aluminum oxide, 0.8-1.2 parts of calcium carbonate and 0.2-0.5 part of silicon dioxide;
auxiliary agent: 1-3 parts of triethanolamine and 1-3 parts of sorbitol.
By adopting the technical scheme, when the addition amount of calcium carbonate exceeds 1.4%, carbon dioxide generated by calcium carbonate decomposition is excessive, so that more air holes exist on the permanent magnetic ferrite, the compactness of the magnetic tile is reduced, and the Br of the magnetic tile is reduced.
The method reduces the addition amount of calcium carbonate and the amount of carbon dioxide generated by decomposing the calcium carbonate, so that the number of air holes on the magnetic tile is small, the influence on the compactness of the magnetic tile is reduced, and the Br of the magnetic tile is improved; however, the calcium carbonate can promote the uniform distribution of the magnetic oxide crystals, and the reduction of the addition amount of the calcium carbonate can cause the uneven distribution of the magnetic oxide crystals, so that the density of the magnetic tile is reduced, and the structural strength of the magnetic tile is not up to the standard.
In the preparation process of the magnetic tile, sorbitol easily forms a liquid film on the surface of ferrite particles; the triethanolamine and the sorbitol have hydroxyl groups, and when the triethanolamine and the sorbitol are added into the slurry at the same time, the triethanolamine is adhered to the liquid film through hydrogen bonds among the hydroxyl groups; the triethanolamine molecule contains nitrogen atoms with larger electronegativity, electrons of surrounding atoms are easy to be attracted to form negative potential, and when the triethanolamine is attached to a liquid film, adjacent ferrite particles are uniformly distributed due to electrostatic repulsion, so that the density of the magnetic tile is increased, and the structural strength of the magnetic tile is further increased.
Preferably, the weight ratio of the aluminum oxide to the strontium carbonate to the iron oxide red is 1: (1.3-1.5): (6-8).
By adopting the technical scheme, the aluminum oxide is filled among the permanent magnetic ferrite grains, and the growth of the grains is inhibited in the early stage of sintering; during sintering, the aluminum atoms in the aluminum oxide have similar radiuses to the iron atoms, and Al can partially replace Fe in the permanent magnetic ferrite at high temperature, so that the Hcj of the magnetic shoe is improved; when the weight ratio of the aluminum oxide to the strontium carbonate to the iron oxide red is selected, more crystal sites vacated by Fe exist in the crystal lattices of the permanent magnetic ferrite, so that Al can enter the crystal lattices more easily, and the Hcj of the magnetic shoe can be improved more remarkably.
Preferably, the catalyst also comprises 1-3 parts of zirconyl nitrate dihydrate and 1-3 parts of hydrolysis accelerator.
By adopting the technical scheme, the hydrolysis accelerant can promote the zirconium oxynitrate dihydrate to perform hydrolysis reaction to generate zirconium oxide grains; during sintering, the zirconium oxide grains are dispersed at the grain boundary, ferrite crystals grow uniformly under the limiting action of the zirconium oxide grains, and the density of the ferrite is increased, so that the structural strength of the magnetic tile is increased.
Preferably, the hydrolysis promoter is one of ammonia water or ammonium bicarbonate.
By adopting the technical scheme, the ammonium bicarbonate and the ammonia water can promote the zirconium oxynitrate dihydrate to perform hydrolysis reaction to generate zirconium oxide grains; meanwhile, the ammonium bicarbonate and the ammonia water can neutralize acid components in the components, reduce the viscosity of the slurry, contribute to improving the fluidity of the slurry and contribute to the forming of the magnetic shoe.
Compared with ammonium bicarbonate, the ammonia water has stronger alkalinity, and can more remarkably promote the hydrolysis of the zirconyl nitrate dihydrate, thereby increasing the amount of zirconia crystal grains, ensuring that ferrite crystals grow uniformly, and further increasing the structural strength of the magnetic tile.
Preferably, the detergent also comprises 0.2-0.6 parts of boric acid.
By adopting the technical scheme, boric acid and silicon dioxide generate a boric acid glass phase with a low melting point, and the boric acid glass phase can form a solid-liquid interface between the crystal boundaries of the permanent magnetic ferrite, so that the diffusion distance of crystal grains is increased, the growth of the crystal grains is inhibited, and the Hcj of the magnetic shoe is improved; boric acid and calcium oxide generated by calcium carbonate decomposition can generate calcium metaborate, and similarly, the calcium metaborate with a low melting point plays a role in inhibiting the rapid growth of crystal grains, so that the Hcj of the magnetic tile is further improved.
In a second aspect, the present application provides a method for preparing a permanent magnetic ferrite magnetic shoe with high structural strength, which adopts the following technical scheme:
a preparation method of a permanent magnetic ferrite magnetic shoe with high structural strength comprises the following steps:
s1, weighing the main component and the auxiliary component according to the weight parts, and performing ball milling to obtain slurry 1;
s2, adding sorbitol into the slurry 1, and uniformly stirring;
s3, adding triethanolamine continuously, stirring uniformly, and settling to obtain settled slurry;
and S4, preparing a blank by using the settling slurry, heating to 1200-1260 ℃, and sintering the settling slurry to obtain the permanent magnetic ferrite magnetic tile.
By adopting the technical scheme, the sorbitol is added firstly, and then the triethanolamine is added, so that the triethanolamine is more fully attached to a liquid film of the sorbitol, ferrite particles are uniformly distributed, and the structural strength of the magnetic tile is increased.
Preferably, the step of S1 is: weighing strontium carbonate and aluminum oxide according to the weight parts, mixing the strontium carbonate and the aluminum oxide in a wet mode, and then fully ball-milling to obtain slurry 3; and wet mixing the iron oxide red, the calcium carbonate and the silicon dioxide, adding the mixture into the slurry 3, and fully ball-milling to obtain the slurry 1.
By adopting the technical scheme, the strontium carbonate, the aluminum oxide and the iron oxide red have more contents in the components, and the strontium carbonate, the aluminum oxide and the iron oxide red are subjected to ball milling step by step, so that the strontium carbonate, the aluminum oxide and the iron oxide red are uniformly mixed, the improvement on the uniformity of the permanent magnetic ferrite is facilitated, and the structural strength of the magnetic shoe is improved.
Preferably, the step of S1 is: weighing strontium carbonate, aluminum oxide and calcium carbonate according to the weight parts, wet mixing and fully ball-milling to obtain slurry 4; and uniformly mixing the iron oxide red and the silicon dioxide in a wet mixing mode, adding the mixture into the slurry 4, and fully ball-milling to obtain slurry 1.
By adopting the technical scheme, the iron oxide red and the silicon dioxide are fully wet-mixed, so that the silicon dioxide is fully dispersed in the iron oxide red, the generation of the low-melting-point ferrous silicate is facilitated, the crystal growth is inhibited from being too fast, and the Hcj of the magnetic tile is improved.
Preferably, a pre-sintering step is added between step S1 and step S2, specifically: settling the slurry 1 to obtain primary settling slurry; pre-sintering the primary sedimentation slurry at 1050-1150 ℃ to obtain a pre-sintered material; and crushing and wet grinding the pre-sintered material to obtain slurry.
Through adopting above-mentioned technical scheme, before the sintering, carry out the presintering to the component, help strengthening the structural strength of magnetic shoe, do benefit to the shaping.
Preferably, in the method, the temperature rise rate in the sintering process is 3-5 ℃/min.
By adopting the technical scheme, when the heating rate is 3-5 ℃/min, the size of the crystal grains is uniform during growth, and the compactness of the magnetic tile is improved; in the sintering process, the calcium carbonate and the strontium carbonate are decomposed to generate carbon dioxide, the temperature is increased by 3-5 ℃/min, the carbon dioxide can escape sufficiently, the probability of generating air holes on the magnetic tile is reduced, and the structural strength of the magnetic tile is improved.
In summary, the present application has the following beneficial effects:
1. the addition amount of calcium carbonate is reduced, so that carbon dioxide generated by decomposition of calcium carbonate is less, air holes in the magnetic tile are less, the compactness of the magnetic tile is improved, and Br of the magnetic tile is improved; but reducing the content of calcium carbonate can cause uneven crystal formation of the magnetic tile, thereby reducing the structural strength of the magnetic tile; this application forms the liquid film through sorbitol on ferrite particle surface, recycles the hydrogen bond and makes the triethanolamine adhere to on the liquid film surface, finally makes the ferrite particle under the effect of nitrogen atom in the triethanolamine, because electrostatic repulsion distributes evenly, helps promoting permanent magnetic ferrite's density to the structural strength of magnetic shoe has been improved.
2. The hydrolysis accelerant can promote zirconyl nitrate dihydrate to generate hydrolysis reaction, generates zirconia crystal grains, and the zirconia crystal grains are dispersed in the ferrite crystal and can limit the growth of the crystal during sintering, so that the crystal growth is uniform, and the structural strength of the magnetic tile is increased.
3. The hydrolysis accelerant can promote hydrolysis of zirconyl nitrate dihydrate, can also consume acidic substances in the material, reduces viscosity of slurry, improves fluidity of the slurry, and is beneficial to molding of the magnetic tiles.
4. According to the method, the sorbitol is added firstly, and then the triethanolamine is added, so that the triethanolamine is easier to be attached to a liquid film through hydrogen bonds, and then the adjacent ferrite particles are uniformly distributed due to electrostatic repulsion, and the structural strength of the magnetic tile is increased.
5. According to the method, the iron oxide red and the silicon dioxide are preferably fully wet-mixed, so that the silicon dioxide is fully dispersed in the iron oxide red, the excessive rapid grain growth is favorably inhibited, and the Hcj of the magnetic tile is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The starting materials used in the examples are all commercially available.
Wherein the iron oxide red is purchased from Shenyang Xinhao Chengda center chemical industry Co., Ltd, and the granularity is 600-1200 meshes;
the aluminum oxide is purchased from Henan Tian remuneration chemical products Co., Ltd, and the granularity is 600-800 meshes;
the strontium carbonate is purchased from Gallery, Pengcai Fine chemical Co., Ltd, and the granularity is 600-1000 meshes;
triethanolamine was purchased from Zhengzhou Chuang beauty products, Inc.;
sorbitol sugar was purchased from Tianjin Zhongshengtai chemical Co., Ltd;
zirconyl nitrate dihydrate was purchased from Shanghai Allantin Biotechnology, Inc.;
examples
Examples 1 to 8
As shown in Table 1, examples 1 to 8 are different in the ratio of raw materials.
The following description will be made by taking example 1 as an example.
The preparation method of the permanent magnetic ferrite magnetic shoe of the embodiment 1 is as follows:
s1, weighing iron oxide red, strontium carbonate, aluminum oxide, calcium carbonate and silicon dioxide, and performing ball milling for 10 hours to obtain slurry 1;
s2, adding sorbitol into the slurry 1, and stirring for 15min at the speed of 60 r/min;
s3, adding triethanolamine, stirring at 60r/min for 30min, and settling until the water content is 15% to obtain settled slurry;
s4, injecting the settling slurry into a hard alloy runner mold, and pressing the settling slurry into a green blank by using a 150-ton automatic hydraulic press; sintering the green body in an electric sintering kiln at 1200 ℃ for 3 h; and cooling to obtain the permanent magnetic ferrite magnetic shoe.
Wherein the heating rate is 3 ℃/min; the specification of the steel ball is phi 6.35 mm.
TABLE 1
Examples 9 to 14
Compared with the embodiment 5, the embodiment 9-14 is characterized in that the formula also contains zirconyl nitrate dihydrate and hydrolysis accelerator.
As shown in Table 2, examples 9 to 14 are different in the ratio of raw materials.
The following description will be made by taking example 9 as an example.
S1, weighing iron oxide red, strontium carbonate, aluminum oxide, calcium carbonate and silicon dioxide, ball-milling for 10h, adding zirconyl nitrate dihydrate and hydrolysis accelerator, mixing at 50r/min for 30min to obtain slurry 1
S2, adding sorbitol into the slurry 2, and stirring for 15min at the speed of 60 r/min;
s3, adding triethanolamine, stirring at 60r/min for 30min, and settling until the water content is 15% to obtain settled slurry;
s4, injecting the settling slurry into a hard alloy runner mold, and pressing the settling slurry into a green blank by using a 150-ton automatic hydraulic press; sintering the green body in a sintering electric kiln at 1200 ℃ for 3 h; and cooling to obtain the permanent magnetic ferrite magnetic shoe.
Wherein, the hydrolysis accelerant selects ammonia water with the mass fraction of 15 percent, and the rest is the same as the embodiment 1.
TABLE 2
Example 15
This example is different from example 10 in that boric acid of 0.2kg is further contained in the formulation.
Example 16
This example differs from example 15 in that boric acid in the formulation is 0.4 kg.
Example 17
This example differs from example 15 in that boric acid in the formulation was 0.6 kg.
Example 18
This example differs from example 5 in the preparation method; s1 in the preparation method of this example is: weighing strontium carbonate and aluminum oxide, wet-mixing for 30min at the speed of 50r/min, and placing in a ball mill for ball milling for 2.5 h; weighing iron oxide red, calcium carbonate and silicon dioxide, wet-mixing for 30min at the speed of 50r/min, placing in a ball mill containing strontium carbonate and alumina, and ball-milling for 2.5h to obtain slurry 1.
Example 19
The difference between the present example and example 5 is the preparation method; s1 in the preparation method of this example is: weighing strontium carbonate, aluminum oxide and calcium carbonate, wet-mixing at a speed of 50r/min for 30min, and placing in a ball mill for ball milling for 2.5 h; weighing iron oxide red and silicon dioxide, wet mixing for 30min at the speed of 50r/min, placing in a ball mill containing strontium carbonate, aluminum oxide and calcium carbonate, and ball-milling for 2.5h to obtain slurry 1.
Example 20
This example is different from example 10 in that the temperature increase rate was 4 ℃/min.
Example 21
This example is different from example 10 in that the temperature increase rate was 5 ℃/min.
Example 22
This example is compared with example 5, except that the preparation process was different.
The preparation method of the embodiment comprises the following steps:
s1, weighing iron oxide red, strontium carbonate, aluminum oxide, calcium carbonate and silicon dioxide, and performing ball milling for 5 hours to obtain slurry 1;
s2, naturally settling the slurry 1 until the water content is 20% to obtain primary settling slurry;
s3, placing the primary sedimentation slurry in a sintering electric kiln, setting the temperature to be 1100 ℃, preserving the heat for 1h after sintering is finished, and crushing after cooling to obtain a pre-sintered material;
s4, adding the pre-sintered material into a ball mill, and wet-milling for 10 hours to obtain slurry 2;
s5, adding sorbitol into the slurry 2, and stirring for 15min at the speed of 60 r/min;
s6, adding triethanolamine, stirring at 60r/min for 30min, and settling until the water content is 15% to obtain settled slurry;
s7, injecting the settling slurry into a hard alloy runner mold, and pressing the settling slurry into a green blank by using a 150-ton automatic hydraulic press; sintering the green body in an electric sintering kiln at 1200 ℃ for 3 h; and cooling to obtain the permanent magnetic ferrite magnetic shoe.
Comparative examples
This comparative example differs from example 10 in that the composition does not contain zirconyl nitrate dihydrate.
Comparative example
Comparative example 1
A permanent magnetic ferrite magnetic shoe is prepared according to the preparation method disclosed in embodiment 5 with the authorization publication number of CN 103771882B.
Comparative example 2
This comparative example is compared to example 5, with triethanolamine missing from the formulation.
Comparative example 3
This comparative example is compared to example 5, with sorbitol lacking in the formulation.
Performance test
Respectively according to the preparation methods of the examples 1 to 23, the comparative example and the comparative examples 1 to 3, 10 magnetic tiles of 27 kinds are prepared, and Br, Hcj and (BH) of the magnetic tiles are detected according to GB/T3217-maxbThe tensile strength of the magnetic shoe was measured in accordance with GB/T6983-2008, and the average value was recorded in Table 3.
Detection method
TABLE 3
The present application is further described below in conjunction with table 3.
With the combination of the embodiments 1-8, the addition amount of calcium carbonate is reduced, and the amount of carbon dioxide generated by decomposing the calcium carbonate is reduced, so that air holes on the magnetic tile are reduced, the compactness of the magnetic tile is improved, and Br of the magnetic tile is obviously improved; however, reducing the addition of calcium carbonate can lead to uneven ferrite crystal formation and reduce the tensile strength of the magnetic shoe; according to the application, the sorbitol forms a liquid film on the surface of the ferrite particles, the triethanolamine is attached to the liquid film through hydrogen bonds, and the electronegativity of nitrogen atoms in triethanolamine molecules is large, so that adjacent ferrite particles are uniformly distributed due to electrostatic repulsion, the density of the magnetic tile is increased, and the tensile strength of the magnetic tile is improved; the magnetic shoe prepared by the preparation method has high Br and high tensile strength.
By combining the embodiments 1-8 and the comparative example 1, compared with the comparative example 1, the embodiments 1-8 reduce the addition amount of calcium carbonate, thereby reducing carbon dioxide generated by decomposing the calcium carbonate, improving the compactness of the magnetic tile and obviously improving the Br of the magnetic tile; meanwhile, Hcj and (BH) of examples 1 to 8maxbThe calcium carbonate content is higher than that of the comparative example 1, and the calcium carbonate is decomposed to generate nonmagnetic calcium oxide, so that the nonmagnetic phase in the magnetic tile is increased, and the Hcj and (BH) of the magnetic tile are reducedmaxb(ii) a The tensile strength of the examples 1-8 is higher than that of the comparative example 1, which shows that the application has better effect of improving the tensile strength of the magnetic shoe than calcium carbonate by matching triethanolamine with sorbitol.
By combining the embodiment 5 and the comparative examples 2-3, the comparative example 2 lacks triethanolamine, a liquid film formed by only sorbitol is difficult to make ferrite particles uniformly distributed, the density of the magnetic shoe is not high, and the tensile strength is low; in comparative example 3, sorbitol is absent, triethanolamine alone is difficult to adhere to the surface of ferrite particles, and the ferrite particles are difficult to distribute uniformly under the action of electrostatic repulsion, and similarly, the tensile strength of the magnetic shoe is low.
With reference to example 10 and comparative example, the comparative example does not contain zirconyl nitrate dihydrate, is difficult to hydrolyze to form zirconia grains, has poor effect of inhibiting the growth of ferrite crystals, and reduces the density of the magnetic shoe, so that the tensile strength of the magnetic shoe is poor.
Combining examples 10 and 22, pre-sintering the components prior to sintering helps to promote uniform ferrite crystal distribution and thus increases the tensile strength of the magnetic shoe.
With reference to examples 1, 2, and 8 and examples 3 to 7, in examples 3 to 7, the weight ratio of alumina, strontium carbonate, and iron oxide red was 1: (1.3-1.5): (6-8), the replacement of Fe by Al is facilitated, and the improvement of the Hcj of the magnetic tile is more remarkable.
With the combination of examples 9 to 11 and 5, the hydrolysis accelerator can promote hydrolysis to generate zirconia grains, and the zirconia grains are uniformly dispersed among ferrite particles; during sintering, the growth of ferrite crystals is limited by the zirconia grains, so that the ferrite crystals grow uniformly, the density of the ferrite is increased, and the tensile strength of the magnetic tile is increased; meanwhile, the hydrolysis accelerant can reduce the viscosity of the slurry and increase the fluidity of the slurry, so that the magnetic tile is formed uniformly and has higher tensile strength.
With reference to examples 9 to 14, the ammonia water has stronger alkalinity compared to ammonium bicarbonate, and can significantly promote the hydrolysis of zirconyl nitrate dihydrate, thereby increasing the amount of zirconia crystal grains, making ferrite crystals grow uniformly, and further increasing the tensile strength of the magnetic shoe.
By combining the embodiments 15-17 and 10, the boric acid glass phase generated by boric acid and silicon dioxide can form a solid-liquid interface between crystal boundaries, inhibit the growth of crystal grains and obviously improve the Hcj of the magnetic tile; in addition, boric acid can react with calcium oxide generated by calcium carbonate decomposition to generate calcium metaborate with lower melting point, thereby reducing non-magnetic phase in the permanent magnetic ferrite, Br (BH) of magnetic tilemaxbAll have the promotion effect.
By combining the embodiment 5 and the embodiment 18, the strontium carbonate, the aluminum oxide and the iron oxide red are uniformly mixed by adopting a step-by-step ball milling mode of the strontium carbonate, the aluminum oxide and the iron oxide red, so that the formed permanent magnetic ferrite particles are uniform, the density of the magnetic shoe is increased, and the tensile strength of the magnetic shoe is improved.
By combining the embodiment 5 and the embodiment 19, the silicon dioxide is fully dispersed in the iron oxide red, which is beneficial to fully dispersing the silicon dioxide and the ferrous silicate generated by the iron oxide red, so that the crystal grows uniformly, and the tensile strength of the magnetic tile is improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (7)
1. The permanent magnetic ferrite magnetic shoe with high structural strength is characterized by being prepared from the following components in parts by weight:
the main components are as follows: 70-90 parts of iron oxide red and 10-20 parts of strontium carbonate;
auxiliary components: 6-13 parts of aluminum oxide, 0.8-1.2 parts of calcium carbonate and 0.2-0.5 part of silicon dioxide;
auxiliary agent: 1-3 parts of triethanolamine, 1-3 parts of sorbitol, 1-3 parts of zirconyl nitrate dihydrate, 1-3 parts of a hydrolysis promoter and 0.2-0.6 part of boric acid, wherein the hydrolysis promoter is one of ammonia water or ammonium bicarbonate.
2. The permanent magnetic ferrite magnetic shoe with high structural strength as claimed in claim 1, characterized in that: the weight ratio of the aluminum oxide to the strontium carbonate to the iron oxide red is 1: (1.3-1.5): (6-8).
3. The method for preparing a permanent magnetic ferrite magnetic shoe with high structural strength as claimed in any one of claims 1 to 2, characterized by comprising the following steps:
s1, weighing the main component and the auxiliary component according to the weight parts, and performing ball milling to obtain slurry 1;
s2, adding sorbitol into the slurry 1, and uniformly stirring;
s3, adding triethanolamine continuously, stirring uniformly, and settling to obtain settled slurry;
and S4, preparing a blank by using the settling slurry, heating to 1200-1260 ℃, and sintering the settling slurry to obtain the permanent magnetic ferrite magnetic tile.
4. The method for preparing a permanent magnetic ferrite magnetic shoe with high structural strength according to claim 3, characterized in that: the step of S1 is: weighing strontium carbonate and aluminum oxide according to the weight parts, wet mixing, and ball milling to obtain slurry 3; and wet mixing the iron oxide red, the calcium carbonate and the silicon dioxide, adding the mixture into the slurry 3, and fully ball-milling to obtain slurry 1.
5. The method for preparing a permanent magnetic ferrite magnetic shoe with high structural strength according to claim 3, characterized in that: the step of S1 is: weighing strontium carbonate, aluminum oxide and calcium carbonate according to the weight parts, wet mixing and ball milling to obtain slurry 4; and uniformly mixing the iron oxide red and the silicon dioxide in a wet mixing mode, adding the mixture into the slurry 4, and performing ball milling to obtain slurry 1.
6. The method for preparing a permanent magnetic ferrite magnetic shoe with high structural strength according to claim 3, characterized in that: adding a pre-sintering step between the step S1 and the step S2, specifically: settling the slurry 1 to obtain primary settling slurry; pre-sintering the primary sedimentation slurry at 1050-1150 ℃ to obtain a pre-sintered material; and crushing and wet grinding the pre-sintered material to obtain slurry 2.
7. The method for preparing the permanent magnetic ferrite magnetic shoe with high structural strength according to claim 3, characterized in that: in the method, the temperature rise rate in the sintering process is 3-5 ℃/min.
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