A method for anti-oxidation of magnetic powder particle surface with omnidirectional coating
A particle surface, all-round technology, applied in permanent magnet manufacturing, inductor/transformer/magnet manufacturing, transportation and packaging, etc., can solve the problem of reduced service life of magnetic powder, the anti-oxidation film can not completely wrap the magnetic powder, and the anti-oxidation of magnetic powder Defects and other problems to achieve the effect of avoiding waste
Active Publication Date: 2021-10-01
JIANGSU JUXIN MAGNET
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Problems solved by technology
[0004] However, when the above-mentioned patent realizes the formation of an anti-oxidation film on the surface of the magnetic powder, since the magnetic powder is laid on the conveyor belt, the lower surface of the magnetic powder is in contact with the surface of the conveyor belt and cannot be in contact with the atomized solution. As a result, the anti-oxidation film formed on the surface of the magnetic powder in the later stage is only attached to the magnetic powder. The upper surface of the magnetic powder, that is, the anti-oxidation film cannot completely cover the magnetic powder, which leads to certain defects in the oxidation resistance of the magnetic powder, and even reduces the use effect and service life of the magnetic powder.
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Embodiment 1
[0047] see Figure 1-2 , a method for all-round film-attached anti-oxidation on the surface of magnetic powder particles, comprising the following steps:
[0048] S1. First lay the magnetic powder particles on the circumferential bottom film atomizing disc, and place the circumferential bottom film atomizing disc on the conveyor belt in turn;
[0049] S2. Control the conveyor belt to drive the circumferential bottom film atomizing disc to pass through the spray evaporation chamber several times;
[0050] S3. When passing through the spray evaporation chamber for many times, spray and evaporate phosphoric acid, sodium bisulfite solution and sodium hydroxide solution respectively, and simultaneously pass the above solutions into the circumferential bottom film atomization disk in sequence;
[0051] S4, electrifying the bottom of the atomizing plate with the circumferential bottom film to dry the magnetic powder, so that a dense anti-oxidation film is formed on the surface of th...
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Abstract
The invention discloses an anti-oxidation method with an omnidirectional coating on the surface of magnetic powder particles, which belongs to the field of anti-oxidation of magnetic powder particles. Evaporate the solution so that it is atomized at the bottom of the magnetic powder particles at the bottom, and the atomized solution passes through the gap between the bubble chain plates from bottom to top and the homogenized soft layer directly contacts with the bottom of the magnetic powder particles to form an anti-oxidation layer at the bottom. Part of the atomized solution will have a certain impact on the bubble chain plate, causing the bubble chain plate and the homogenization soft layer to have a certain undulation effect, and then the magnetic powder particles above can move to a certain extent to "turn over", so that the magnetic powder and homogenization The contact part of the soft layer is not always the same part, and at the same time cooperate with the existing technology to form an anti-oxidation layer on the upper surface of the magnetic powder, so that the effect of making the magnetic powder can produce an anti-oxidation layer in all directions, effectively improving the oxidation resistance and service life of the magnetic powder .
Description
technical field [0001] The invention relates to the field of anti-oxidation of magnetic powder particles, and more specifically relates to an anti-oxidation method for all-round coating on the surface of magnetic powder particles. Background technique [0002] A hard magnetic monodomain particle. It is made into a magnetic slurry with adhesives, solvents, etc., and coated on the surface of a plastic or metal substrate (support), it can be made into magnetic recording materials such as magnetic tapes, magnetic disks, and magnetic cards. Magnetic powder is the core component of magnetic coatings and the main factor determining the magnetic properties of magnetic recording media. Magnetic powder has a great influence on the properties of magnetic recording materials. Therefore, there are certain requirements for magnetic powder: ①It is larger than the saturation magnetization σs and coercive force Hc; ②The particles are fine and needle-shaped and uniform; ③It has high dispers...
Claims
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IPC IPC(8): H01F41/02B22F1/00
CPCH01F41/026B22F1/145
Inventor 郁成斌
Owner JIANGSU JUXIN MAGNET