Method for manufacturing dry press permanent magnetic ferrite
A technology of permanent magnet ferrite and manufacturing method, which is applied in the field of magnetic materials, can solve the problems of limitation of promotion of permanent magnet ferrite, easy cracking of blanks, and low orientation degree of dry pressing magnetic field, and achieves optimization and improvement of particle size and morphology of magnetic powder. Magnetic properties, the effect of improving yield
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0022] Example 1:
[0023] Select Y38 pre-fired material on the market, add a number of required additives according to the mass ratio for ball milling, the time is 15 hours, and the speed is 30r / min. The slurry obtained in the above steps is stored at 110°C until it is dried, and the average particle size is about 1.2 μm. After drying the magnetic powder, add 0.4% calcium stearate and 1.2% alcohol camphor solution (camphor:alcohol = 1:1), and use a high-speed pulverizer to disperse after the mixture is uniform. Put the magnetic powder into a mold and form it in a 8000 Oe magnetic field with a forming pressure of 4 MPa. The resulting formed body has a diameter of 5 cm and a height of 1.6 cm. The green body was kept at 350°C for 3 hours to remove calcium stearate, and then at 1150°C for 3 hours to obtain a ferrite sintered magnet. After grinding and cleaning, the magnet is kept at 23° C. for 24 hours, and then the magnetic properties are measured to obtain Br=4061Gs, Hcb=3221Oe,...
Example Embodiment
[0029] Example 2:
[0030] Select Y38 pre-fired material on the market, add a number of required additives according to the mass ratio for ball milling, the time is 12 hours, and the speed is 50r / min. The slurry obtained in the above steps is stored at 110°C until it is dried, and the average particle size is about 1.2 μm. After drying the magnetic powder, add 0.5% calcium stearate, 1.0% alcohol camphor solution, and 0.2% talc powder, and then use a high-speed pulverizer to disperse them after they are evenly mixed. Put the magnetic powder into a mold and form it in a 8000 Oe magnetic field, and the forming pressure is 5 MPa. The diameter of the formed body is 5 cm and the height is 1.5 cm. The green body was kept at 400°C for 1 hour to remove calcium stearate, and then at 1350°C for 0.1 hour to obtain a ferrite sintered magnet. After grinding and cleaning, the magnet was kept at 23°C for 24 hours, and then the magnetic properties were measured to obtain Br=4103Gs, Hcb=3245Oe, ...
Example
[0033] Table 2 Magnetic properties of the magnets of Example 2 and Comparative Example 2
[0034]
[0035] Table 2 shows the magnetic properties of the magnets obtained in Example 2 and Comparative Example 2. It can be seen from Table 2 that the addition of 0.2% talc helps to increase the remanence and increase the molding pass rate. Talcum powder as a dispersant can reduce the friction between dry powders, play a buffering effect, help magnetic field orientation and improve the molding rate.
PUM
Property | Measurement | Unit |
---|---|---|
Average size | aaaaa | aaaaa |
Diameter | aaaaa | aaaaa |
Average size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap