A method of manufacturing an anisotropic polycrystalline ferrite material and a device for its implementation

 

The invention relates to the manufacture of anisotropic ferrite material powder of hexagonal barium ferrite W-type and can be used for the production of magnetic recording media, non-microwave devices, permanent magnets and working bodies of magnetic refrigerators. A method of manufacturing an anisotropic polycrystalline ferrite material powder of hexagonal barium ferrite system VASO2ZnxFe16O27where x =1,0 -1,4, including the preparation of ferrite powder and the magnetic treatment effect on the powder placed in the non-magnetic press-shaped, varying in time and space by the magnetic field. Before magnetic powder of it is mixed with the liquid. Magnetic field influence on the mixture of the liquid with the powder is carried out in a horizontal plane alternately in two directions, the angle between them is 60 to 120o. Both components of the magnetic field is chosen in the form of gradually increasing and gradually decreasing the low-frequency pulse sequences, the maximum value of tension within the 100-400 kA/m At the final stage of magnetic treatment exercise preload powder press the CSOs in the preload powder. The described device for implementing the inventive method. The technical result is to increase the degree of magnetic texture of polycrystalline ferrite material (magnetic anisotropy). 2 S. and 1 C.p. f-crystals, 3 ill.

The invention relates to a process of manufacturing the ferrite anisotropic material of hexagonal barium ferrite W-type (BaMe2Fe16O27with the substitution of the metal (Me) cobalt and zinc (BaCo2-xZnxFe16O27) and can be used in the production process of the magnetic recording media, elements of non-microwave devices (valves and circulators), permanent magnets and working bodies of magnetic refrigerators that require a material with high magnetic texture.

The closest way to claimed is a method of obtaining products of barium ferrite, comprising preparing a powder of ferrite, the magnetic treatment effect on ferrite powder, placed in a non-magnetic press-shaped, varying in time and space magnetic field [1]. The disadvantage is that the ferrite material obtained by this method has no magnetic anisotropy.

Another close analogously [2]. The disadvantage of this device is that obtained by its use, the material acquires a high degree of magnetic textures only for the powder particles with uniaxial magnetic anisotropy and the shape of the particles, elongated along the anisotropy axis (degree of magnetic material texture is 70 - 80%), and for trains W (BaCo2-xZnxFe16O27with a flat hexagonal shape of the particles with other types of magnetic anisotropy (these include the compositions with x = 0 -1,0 having a planar anisotropy and compositions with x = 1,0 -1,4 with anisotropy of the "cone of easy magnetization"), creating a high degree of magnetic texture when specified in the similar directions of magnetic field and pressure are not feasible.

The technical result, which is aimed proposed solution is to increase the magnetic anisotropy or, equivalently, an increase in the degree of magnetic material texture, made on the basis of hexagonal barium ferrite system BaCo2-xZnxFe16O27where x = 1,0 -1,4, and related to the structural type W.

This is achieved in that in the method of manufacturing the anisotropic polycrystalline ferrite material eat the preparation of ferrite powder, the magnetic treatment effect on ferrite powder, placed in a non-magnetic press-shaped, varying in time and space magnetic field, pressing the powder at the final stage of its magnetic treatment of vertically growing pressure for halting movement of the ferrite particles, and compressing the resulting preload powder briquette, before the magnetic powder of it is mixed with freezing in part or in the whole temperature range (-150) - (320-300X)oWith the liquid, the influence of a magnetic field to the mixture of the liquid with the powder in the mold at a temperature selected in accordance with the composition in the above range, is carried out in a horizontal plane alternately in two directions, the angle between them is 60 to 120oand both components of the magnetic field is chosen in the form of gradually increasing and gradually decreasing the low-frequency pulse sequences, the maximum value of tension within the 100-400 kA/m

This is achieved by the fact that the device for manufacturing an anisotropic polycrystalline ferrite material powder of hexagonal barium ferrite BaCo2-xZnxFe16othe first output of the output winding of the transformer is connected to the cathode of the first diode and the anode of the second, first and second pairs of coils of rod cores are connected respectively with the anode of the first diode and the cathode of the second, and the ends of both pairs of windings core magnetic circuits is connected to the second output winding of the transformer.

The second pair sterinebs the company in a horizontal plane at an angle of30o.

In Fig.1 shows a device for manufacturing polycrystalline ferrite material (transformer and the diodes in the figure are not shown); Fig.2 is an electric diagram of the device and Fig.3 is a diagram of magnetic States of hexagonal ferrites of barium system BaCo2-xZnxFe16O27necessary to understand the claimed technical result.

Device for the manufacture of polycrystalline ferrite material contains a General basis 1, non-magnetic mold 2, the nonmagnetic thermostat 3, the first pair of rod cores 4 and 5 and the first couple of belonging to the windings (coils) 6 and 7, the second pair of rod cores 8 and 9 and the second pair belonging to the windings (coils) 10 and 11, the magnetic circuit of a C-shaped sections 12 and 13, secured in the base 1 and connected to the first and second pairs of rod-like cores 4 and 5 and 8 and 9. The upper part of the base 1 with fixed therein With a-shaped magnetic core 13 is made to rotate by the angle30orelative to the bottom of the base (the limits of rotation of the magnetic core 13 and is rigidly associated rod-like cores 8 and 9 show the rod and magnetic circuits 4, 5, 8 and 9. The punch 14 is used for transmitting external vertically growing pressure placed in the mold 2 a mixture of liquids with ferrite powder.

In Fig.2 marked: 15 - low-frequency transformer; 16 and 17, the first and second rectifier diodes; 18 and 19, the first and second magnetic cores (set of cores, shown in Fig.1 through 4, 5 and 12 and 8, 9 and 13); 20, 21, 22, 23, the first and second pair of windings (indicated in Fig.1 through 6, 7, and 10, 11 respectively).

In Fig.3, which shows a diagram of magnetic States of a system of barium hexaferrite type W (formula unit VASO2-xZnxFe16O27) [3] through x denoted the number of cations Zn, replacing an equivalent number of cations From; T - temperature, through I, II, III, IV and V indicated the existence of regions in this system: I - paramagnetism, II - axis of easy magnetization, III - cone of easy magnetization, IV - plane easy magnetization, and V - cone of easy magnetization. The shaded part IV relates to the field we stated values of x, and So

Device for the manufacture of anisotropic polycrystalline ferrite material works as follows. The mixture powder hexaferrite barito (Fig.3), placed in the mold 2. The mold 2 is placed in thermostat 3, the cooled vapors of liquid nitrogen, if the selected treatment temperature is lower than room temperature. In this case, as a non-freezing liquid can be used, for example, ethyl alcohol or acetone, the melting temperature of which are respectively -114,15 and -95,35oC. To input terminals of the transformer 15 serves an alternating voltage the frequency of which is selected in the range of 1-50 Hz. With the secondary winding of the transformer the voltage across the diodes 16 and 17 serves on the United accordance with consistently windings 20, 21 and 22, 23. One pair of windings current passes during one half-cycle of alternating voltage, the other pair of windings, the other half.

Pulsed magnetic field acting in the horizontal plane at an angle of 60-120ogradually laid flat hexagonal ferrite particles in the horizontal plane by an external magnetic field on the hexagonal particles acts torque). Slow rotation (swing) of a C-shaped magnet core 13 with the United with him the rod cores 8 and 9 and the windings 10 and 11 around the vertical axis accelerates the orientation of the particles in the horizontal processing of the particles (the processing time is determined experimentally and is within units tens of minutes) is produced by pressing a mixture of a liquid with a ferrite powder with an effort, at which it becomes impossible for the motion of particles in the mixture. Then the mold with the briquette is removed from thermostat. Next make pressing briquettes at a pressure of up to 100 to 120 MPa.

The increase in the degree of magnetic anisotropy (degrees magnetic texture) when using the inventive method and device is achieved, firstly, due to the fact that the selected correlation value between the temperature of the mixture of the liquid with the powder of ferrite, the value of x (the proportion of Zn in the composition of the ferrite and the magnetic field provide an opportunity to influence the magnetic field on the particles of hexagonal barium ferrite with these values, the condition of the plane of easy magnetization, i.e., enable all of the flat hexagonal particles to fit parallel to each other, and, secondly, due to the fact, the preload of the particles produced in the direction perpendicular to their planes, not in parallel, as is done in the prototype.

Experimental studies have shown that the degree of texture of the ferrite composition BaCo2-xZnxFe16O27when x = 1,0-1,4 obtained by the claimed method was 84-94% (the figures of their x-ray analysis (comparison of height of the diffraction maxima in the reflection with indices hkl 001 and).

Sources of information 1. Abrosimov, C. A., Kuznetsov, Y. N., Kitaev, A. L., Lyapunov Century. N. The method of obtaining products of barium ferrite. A. C. the USSR 669416// BI 23, 1979.

2. The A. Yumatov A. I., Gladkov, I., Tikhonov Century C. the Device for pressing powders of barium ferrite. A. C. the USSR 535142// BI 42, 1976.

3. E. P. Naiden, Maltzev V. I., Rjabtsev G. I. Magnetic Structure and Spin-orientational Transitions of Hexaferrites of BaCo(2-x)Zn(x)Fe(16)O(27)//Physica Status Solidi(a), 1990, V. 120, 1, R. 209-218.

Claims

1. A method of manufacturing an anisotropic polycrystalline ferrite material powder of hexagonal barium ferrite system BaCo2-xZexFe16O27where x=1,0-1,4, including the preparation of ferrite powder and the magnetic treatment effect on the powder placed in the non-magnetic press-shaped, varying in time and space magnetic field, characterized in that before the magnetic powder of it is mixed with liquid, freezing in part or in the whole temperature range (-150)(320-300X)With, and the influence of a magnetic field to the mixture of the liquid with the powder in the mold at a temperature chosen in the interval, is carried out in a horizontal plane alternately in two EmOC what I choose in the form of gradually increasing and gradually decreasing the low-frequency pulse sequences, maximum strength values which are within 100-400 kA/m, at the final stage of magnetic treatment exercise preload powder pressure for halting motion of particles of ferrite, followed by pressing briquettes obtained by pressing of powder.

2. Device for the manufacture of anisotropic polycrystalline ferrite material powder of hexagonal barium ferrite system BaCo2-xZnxFe16O27where x=1,0-1,4 containing the mold, characterized in that it contains a General basis, non-magnetic thermostat molds, low frequency transformer, two rectifier diode, the first pair of rod cores, arranged coaxially in the horizontal plane with a gap between their working poles and mounted on a common base, the first pair of windings placed around the first pair of rod cores and connected in accordance consistently, the second pair of rod cores, arranged coaxially with a gap between their working poles and mounted on a common base, the second pair of windings, posted by around the second pair of rod cores and the United States the St and second pairs of rod cores are arranged at an angle of 60-120the first output of the output winding of the transformer is connected to the cathode of the first diode and the anode of the second, first and second pairs of coils of rod cores are connected respectively with the anode of the first diode and the cathode of the second, and the ends of both pairs of windings core magnetic circuits is connected to the second output of the output transformer.

3. The device according to p. 2, characterized in that the second pair of rod cores located around the windings mounted on the common base plate can be rotated in a horizontal plane at an angle of±30°.

 

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