Magnet manufacturer analysis magnet preparation method

May 18, 2023

Magnetic beads manufacturer talk about magnetic beads manufacturer analysis of the preparation of magnets.

Its characteristics are:

1. The hard magnetic compound is one of R↓[2]T↓[17], R↓[2]T↓[14]M, wherein R is at least one element of a rare earth element and lanthanum, or a rare earth element and yttrium. A combination of elements, or a mixture of rare earth and lanthanum elements, T is a combination of at least one transition metal element or a transition metal element, and M is at least one element selected from elements of Groups IIIA, IVA and VA of the Periodic Table. ;

2. Magnetic beads manufacturers analyze the powders of hard magnetic compounds along the radiation orientation, radial multi-orientation, radial pair orientation, axial orientation, and radial-axial composite orientation of the molded magnetic ring, respectively. The powders are respectively oriented unidirectionally and radially in radial directions along the shaped magnetic tile, and the powder of the hard magnetic compound is oriented along the main forming direction of the solid magnet;

3. Place the blank spacing code to facilitate uniform heating and uniform cooling. Place reasonable blanks and leave some space on the upper part of the blank to facilitate the orderly and smooth discharge of gases and volatile substances in the blank during heating; vacuum first. Then vacuum side to remove volatile materials, and then control the speed of heating to the sintering temperature;

4. Pre-sintering followed by sintering process or direct sintering process; in the pre-sintering or / and sintering process, continue to vacuum and then recharge inert protective gas, and control the speed of inert protective gas filling;

5. After the sintering insulation is completed, take one of the following methods to control the temperature: Method 1: Control the cooling rate Quenching to the heat treatment temperature, then directly heat treatment, Method 2 Control the cooling rate Quench to the critical temperature, and then control the cooling rate from the critical temperature to the slow temperature Cool to near room temperature or room temperature, then control the heating rate slowly to the temperature critical temperature, then moderately increase the rate of heating to the maximum heat treatment platform temperature and heat treatment; preferred temperature control method

6. The critical temperature is the Curie temperature of the corresponding hard magnetic compound plus 10 to 40°C; when the magnet density reaches more than 90% of the theoretical density, the temperature change rate is strictly controlled during the heating or cooling process; especially at the speed From the critical temperature to room temperature, the temperature change rate should be changed at the slowest speed;

7. In the process of cooling from a heat treatment heating temperature stage to a lower heating temperature stage and cooling to room temperature after heat treatment heat insulation is finished, when the temperature is higher than the temperature critical temperature, controlled cooling; when the temperature is lower than the speed At the critical temperature, the control speed is slowly cooled to room temperature and then released;

8. Magnetic beads manufacturers use this preparation method to analyze, and the yield of complex-oriented magnets is greatly improved. We are manufacturer of magnetic beads, mainly engaged in: EMI beads, air core beads, braided beads, magnetic bars, magnetic flux, to create the first brand of magnetic beads in China magnetic electronics industry Faucet.