Spherical object comprising ferrite material and use of spherical object comprising ferrite material

Abstract

A ball (1) comprising a ferrite material is described. Furthermore, the use of a plurality of spheres (1) for doping a substrate to obtain a magnetic mixture having specific magnetic properties is described.

Description

[0001] The invention relates to a sphere comprising a ferrite material. Furthermore, the invention relates to the use of a plurality of spheres comprising a ferrite material.

[0002] The magnetic properties of magnetic materials such as cement or concrete are achieved by filling the material with soft magnetic materials such as MnZn-ferrite ceramics. The filling factor of the magnetic material in the final suspension is the main parameter for the magnetic properties such as effective permeability.

[0003] A common material used in many magnetic mixtures, such as cement or concrete, is sintered ferrite powder ground to a specific particle size distribution. However, the maximum size of the particles brings certain limitations to the maximum achievable magnetic permeability of the final mixture. The very fine particles achieved by grinding have very irregular shapes, and this brings complications during mixing and during processing of the final mixture, especially the fluidity during the casting process. The fine particles of ferrite combine with the water from the mixture and limit the maximum achievable filling factor. In addition, since the sintered powder must be ground, dried, crushed and compacted, high costs are incurred.

[0004] Another way to dope the magnetic mixture with ferrite material is to use crushed ferrite cores. Since ferrite material is very hard and brittle, the shape of crushed ferrite cores is uneven and sharp, which brings complexity during the final mixture processing and limits the final filling factor of the magnetic mixture. The filling factor achieved by these irregular particles is low, and it is almost impossible to control the particle size distribution during the crushing process. In addition to this, crushed ferrite cores are a limited source and will not be available in large quantities.

[0005] An object of the present disclosure is to provide a ferrite sphere and a use of a plurality of ferrite spheres which solve the above mentioned problems.

[0006] This object is solved by a ball and a use of a ball according to the independent claims.

[0007] According to one aspect, at least one ball, in particular a plurality of balls, is provided.The term "ball" refers to a body of compacted material in a specific, ie spherical or rounded, form.

[0008] The sphere is magnetic. Preferably, the sphere comprises a soft magnetic material. The sphere comprises a ferrite material. In particular, the material of the sphere may comprise Fe 2 O 3 、MnO 2 Or ZnO. The material of the spheres may have a spinel structure type. In one embodiment, the spheres may include sintered spinel structured MnZn ferrite.

[0009] According to one embodiment, the spheres are calcined. In addition, the spheres are sintered. The spheres (hereinafter also "ferrite spheres") can be produced in a conventional disc pelletizing or pelletizing process and then calcined and sintered in an existing sintering kiln.

[0010] Compared to conventional ferrite powders, grinding and spray drying are omitted when producing ferrite spheres. Furthermore, crushing, wet grinding and drying of sintered spheres are not necessary compared to sintered ferrite powders. Thus, ferrite spheres are produced in a simple and inexpensive manner. Thus, a very cost-effective product is provided which can be easily produced by conventional methods.

[0011] According to one embodiment, the spheres have a uniform shape. The spheres may all have approximately the same outer shape. In particular, all spheres may have a round outer shape. No sharp edges are present on the surface of the spheres. In particular, the surface of each sphere is smooth.

[0012] In this way, the spheres can be easily further processed, for example by mixing with further materials using existing mixing techniques. Furthermore, through the uniform shape of the ferrite spheres, excellent flowability of the spheres can be achieved.

[0013] According to one embodiment, the ferrite spheres comprise controlled sizes. In other words, the variation of the (predetermined) size of the spheres may be only slight. All spheres may be of approximately the same size, or spheres of different predetermined sizes may be intentionally mixed together.

[0014] The diameter D of each sphere may be 3 mm ≤ D ≤ 15 mm. For example, the diameter of each sphere may be up to 5 mm, 6 mm, 7 mm or 10 mm. The diameter D of the ferrite sphere may be large compared to the size of conventional ferrite powder grains (which range from 1 micron to 200 microns).

[0015] By controlling the size and shape of the ferrite spheres, the miscibility of the spheres by standard mixing techniques used, for example, by the concrete industry is facilitated.Thus, by utilizing existing mixing techniques, the spheres can be efficiently and evenly distributed in the final magnetic mixture.

[0016] According to one embodiment, the density of each spherical object is ≤4200 kg / m 3 . Density can be ≥3000kg / m 3 .

[0017] In other words, the density of each ferrite sphere is quite low. Therefore, the ferrite sphere contains excellent fluidity and can therefore be easily distributed in the matrix.

[0018] According to one embodiment, the relative magnetic permeability of the spheres is ≥ 200. Thus, the magnetic permeability of the spheres is high compared to sintered ferrite powder and compared to pulverized ferrite cores.

[0019] According to one embodiment, the spheres are suitable for use as filler material for a magnetic mixture. In other words, the filler material comprises a plurality of ferrite spheres. The filler material can be designed to be mixed with a substrate (e.g., an inorganic material) to obtain the magnetic mixture mentioned above. The filler material can be designed to dope the substrate.

[0020] The filler material comprises a plurality of sintered ferrite spheres which are produced in a conventional disc pelletizing and / or pelletizing process and then calcined and sintered in an existing sintering kiln. Thus, a very cost-effective filler material is provided which can be easily produced by conventional methods.

[0021] According to another aspect, the use of a plurality of spheres for doping a substrate to obtain a magnetic mixture with specific magnetic properties is provided. In other words, the spheres can be used as filler material. The spheres can contain ferrite material. Preferably, the spheres correspond to the ferrite spheres described above. Therefore, all features described in conjunction with the ferrite spheres also apply to this aspect, and vice versa.

[0022] Compared to sintered ferrite powders and compared to pulverized ferrite cores, spheres bring about high magnetic permeability. Due to their specific properties, spheres enable homogeneous mixing with the matrix and achieve good flowability of the final magnetic mixture.

[0023] For example, an inorganic substrate can be mixed with ferrite spheres. By mixing the substrate with the ferrite spheres, a magnetic mixture with specific magnetic properties can be obtained. The substrate and the ferrite spheres can be mixed by utilizing conventional mixing techniques. This makes it easy to integrate the ferrite spheres into existing production processes for magnetic mixtures.

[0024] The material and / or filling factor and / or magnetic permeability (ie relative permeability) of the ferrite spheres may be adapted according to:

[0025] - the type of substrate, and / or

[0026] - the intended use of the final magnetic mixture, and / or

[0027] - Intended further processing of the pellets.

[0028] In this context, the filling factor reflects the mixing ratio between the ferrite spheres and the matrix. The material of the spheres, the filling factor and / or the relative magnetic permeability can be selected such that a high magnetic permeability and an optimized flowability of the magnetic mixture can be achieved.

[0029] The size of the ferrite spheres can be selected based on the desired flowability of the magnetic mixture and / or the desired magnetic properties and / or the filling factor of the magnetic mixture. In one embodiment, ferrite spheres of the same predetermined size can be mixed with the substrate to obtain the magnetic mixture. Alternatively, ferrite spheres of different predetermined sizes can be mixed with the substrate to obtain the magnetic mixture. In this way, even higher filling factors can be achieved.

[0030] As mentioned above, the diameter of the ferrite spheres is 3 mm to 15 mm. The diameter of the ferrite spheres may be large compared to the size of conventional ferrite powder grains, which range from 1 micron to 200 microns. In this way, a high magnetic permeability of the final magnetic mixture may be achieved. In addition, the diameter promotes the mixability of the spheres, for example, by standard mixing techniques used by the concrete industry. In addition, the controlled diameter of the ferrite spheres helps to easily control the filling factor. The good fluidity and controlled filling factor of the final mixture allow producers of magnetic concrete to use a casting process during construction work.

[0031] The filling factor of the ferrite spheres in the magnetic mixture is ≥ 70% by weight. For example, the filling factor can reach up to 95% by weight. The filling factor of the ferrite spheres in the magnetic mixture can be ≥ 50% by volume.

[0032] When used as a filler material, the spheres may comprise different (but predetermined) sizes. In other words, ferrite spheres of different sizes may be combined to form a filler material. The ratio between the larger sphere B and the smaller sphere S may be B / S=70 / 30. For example, the diameter of the larger sphere may be 10 mm. For example, the diameter of the smaller sphere may be 4 mm or 5 mm. Of course, other mixing ratios B / S may be possible, such as B / S=75 / 25, 80 / 20 or 85 / 15. The combination of larger spheres and smaller spheres helps to increase the filling factor of the filler material in the magnetic mixture.

[0033] When the balls are used as filler material, ferrite sintered powder can also be mixed with the base material / can be added to the magnetic mixture. The ferrite sintered powder can be a conventional ferrite powder ground to a specific particle size distribution. The size of the ferrite grains in the sintered powder can be from 1 μm to 200 μm. By combining ferrite balls with ferrite sintered powder to obtain a magnetic mixture, even higher filling factors can be achieved.

[0034] Additional features, modifications and suitabilities will become apparent from the following description of exemplary embodiments taken in conjunction with the accompanying drawings.

[0035] Figure 1A diagram of a ferrite sphere 1 is shown.

[0036] exist Figure 1 In FIG. 1 , a plurality of spheres 1 are shown. The spheres 1 are compacted bodies comprising a circular outer shape. The spheres 1 comprise a magnetic ferrite material, preferably a soft magnetic ferrite material. In particular, the spheres 1 are sintered ferrite spheres 1 .

[0037] In order to obtain the ferrite spheres 1, firstly, dry mixing of raw materials is performed. The raw materials include, for example, MnZnFER, NiZn FER or MgZn FER.

[0038] After that, a standard disc balling process and / or a standard pelletizing process is carried out. After the ball 1 is formed, the ball 1 is calcined, compacted and delivered to sintering. Sintering is carried out in an existing sintering kiln. In summary, only a few steps are required to obtain the ferrite ball 1. The sintered ferrite ball 1 has a spinel structure type.

[0039] As from Figure 1 As can be seen in the figure, the ferrite spheres 1 have a uniform shape. In particular, the shape of the ferrite spheres 1 is circular. The outer surface of each sphere 1 is smooth. There are no sharp edges or protrusions on the outer surface of the sphere 1. All the spheres 1 have the same (i.e. circular) outer shape.

[0040] The density of each spherical object 1 is 3000 kg / m 3 Up to 4200kg / m 3 , including limits. The relative magnetic permeability of each ferrite sphere 1 (which depends on the size of the sphere 1) can be ≥ 200. The sphere 1 can be easily processed and contains excellent fluidity.

[0041] The spheres 1 are suitable for use as filler material 10. In other words, the spheres 1 are suitable for efficient and uniform mixing with a base material (not explicitly shown). When the spheres 1 are mixed with the base material, a magnetic mixture (not explicitly shown) having specific properties such as good fluidity and high relative magnetic permeability is achieved.

[0042] Compared to sintered ferrite powder and compared to pulverized ferrite cores, the ferrite spheres 1 bring about high magnetic permeability. Due to their specific properties, the spheres 1 enable homogeneous mixing with the matrix and achieve good flowability of the final magnetic mixture.

[0043] The ferrite spheres 1 comprise controlled (i.e. specific) dimensions. The diameter D of each ferrite sphere 1 may be between 3 mm and 15 mm, limits included. In one embodiment, only spheres 1 of a predetermined size (e.g. 3 mm) form the filler material 10. In this case, variations in the dimensions of the spheres 1 may be only slight.

[0044] Alternatively, ferrite spheres 1 of different (predetermined) sizes may be combined to form the filler material 10. For example, ferrite spheres 1 having a diameter of 3 mm to 6 mm may be combined with each other, or alternatively, large ferrite spheres 1 (e.g., spheres 1 having a diameter of 10 mm or even greater) may be combined with small ferrite spheres 1 (e.g., spheres 1 having a diameter of 4 mm, 5 mm, or 6 mm). In this way, the filling factor of the filler material 10 in the final magnetic mixture, i.e., the mixing ratio between the filler material 10 and the base material, may be optimized.

[0045] Due to the specific characteristics of the filler material 10, the magnetic mixture is very homogeneous, contains a high filling factor and good flowability. The filling factor can be ≥ 70% by weight or ≥ 50% by volume. The good flowability and controlled filling factor of the magnetic mixture allow producers of magnetic concrete to use a pouring process during construction work.

[0046] Conventional ferrite sintered powder can also be added to the magnetic mixture. This can be done before the filler material 10 is mixed with the base material, after the filler material 10 is mixed with the base material, or while the filler material 10 is mixed with the base material. By combining ferrite spheres 1 with conventional ferrite sintered powder to obtain a magnetic mixture, an even higher filling factor can be achieved.

[0047] The present invention is not limited to the embodiments based on this description. On the contrary, the present invention covers any new features and any combination of features, which particularly includes any combination of features in the claims, even if the feature or combination itself is not explicitly described in the claims or embodiments.

[0048] Reference numerals

[0049] 1 Ball

[0050] 10Packing materials

[0051] D diameter

Claims

1. A spherical object (1) comprising a ferrite material.

2. The spherical object (1) according to claim 1, The spherical object (1) is sintered.

3. The spherical object (1) according to claim 1 or claim 2, The spherical object (1) comprises controlled dimensions.

4. The spherical object (1) according to any one of claims 1 to 3, The spherical objects (1) have a uniform shape.

5. The spherical object (1) according to any one of claims 1 to 4, The diameter (D) of the spherical object (1) is 3 mm ≤ D ≤ 15 mm.

6. The spherical object (1) according to any one of claims 1 to 5, The density of each spherical object (1) is ≤4200 kg / m 3 And wherein the density is ≥3000kg / m 3 .

7. The spherical object (1) according to any one of claims 1 to 6, The spheres (1) are suitable for use as filler materials (10) for magnetic mixtures.

8. The spherical object (1) according to any one of claims 1 to 7, The spherical object (1) comprises sintered spinel-structured MnZn ferrite.

9. The spherical object (1) according to any one of claims 1 to 8, The spherical objects (1) are formed by a disc pelletizing process and / or a granulation process.

10. The spherical object (1) according to any one of claims 1 to 9, The relative magnetic permeability of the spherical object (1) is ≥200.

11. The spherical object (1) according to any one of claims 1 to 10, The outer surface of the spherical object (1) is smooth.

12. Use of a plurality of spheres (1) for doping a substrate to obtain a magnetic mixture with specific magnetic properties, wherein the spheres (1) comprise a ferrite material.

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