Magnetic materials are core foundational materials for electronics, electrical appliances, and new energy equipment, and are widely used in transformers, sensors, motors, communication equipment, and other fields. In the industrial production of soft magnetic materials and ferrite magnetic materials, industrial-grade magnesium oxide is an indispensable sintering additive and performance modifier. It can effectively optimize the magnet production process, improve the internal structure of the product, and enhance the stability of magnetic parameters, exerting a direct impact on the finished product’s magnetic permeability, loss value, and high-temperature resistance.
The core functions of magnesium oxide in the production of magnetic materials are concentrated in two major aspects: sintering process optimization and performance improvement. First, magnesium oxide acts as a sintering additive to effectively lower the sintering temperature of the magnetic material green body, shorten the sintering cycle, and help enterprises reduce production energy consumption and manufacturing costs. Second, it can regulate the grain growth process, refine the crystal grain size of the magnet, make the grain distribution more uniform and dense, reduce internal pores, looseness, and other defects in the green body, and enhance the structural stability of the magnet.
At the level of performance enhancement, adding an appropriate amount of magnesium oxide can effectively reduce the high-frequency loss of magnetic materials, increase magnetic permeability and saturation magnetic induction, and optimize the electromagnetic performance of the magnet. Meanwhile, the addition of magnesium oxide can enhance the high-temperature resistance and oxidation resistance of magnetic materials, enabling magnets to maintain stable performance in high-temperature and high-frequency working environments, reduce magnetic performance attenuation, extend equipment service life, and meet the operational demands of various electronic devices.
When purchasing magnesium oxide for the magnetic material industry, the core focus should be placed on impurity content, particle size index, reactivity, and batch stability. Impurity control is of paramount importance; excessive impurities such as iron, silicon, and calcium will directly destroy the crystal grain structure of the magnet, leading to increased magnetic loss and decreased magnetic permeability, which severely affects the electromagnetic performance of the finished product. Therefore, low-impurity refined magnesium oxide products should be prioritized. Secondly, the powder particle size must be uniform and controllable. Overly large particle sizes lead to uneven mixing, while excessively small particle sizes easily cause agglomeration—both of which affect the sintering effect and finished product performance.
Product reactivity and process adaptability are equally critical. Magnesium oxide with moderate reactivity can fully participate in the reaction during the sintering process, accurately regulate the pace of grain growth, prevent abnormal grain growth, and ensure uniform and stable magnet performance. At the same time, the production process parameters for magnetic materials are fixed, placing high demands on the consistency of raw material batches. Fluctuations in raw material indicators directly lead to uneven performance in finished products, affecting the product qualification rate.
During the procurement process, enterprises are advised to prioritize magnesium oxide specially designated for magnetic materials, and to verify the adaptability of the raw materials to their own formulas and sintering processes through small-scale sample sintering tests. Procurement should never be based solely on price. Messi Biology can customize low-impurity, particle-size-controllable, and highly stable specialized magnesium oxide according to the production needs of different magnetic materials, accurately adapting to the sintering process and helping downstream enterprises improve the quality of finished magnetic materials and production yield rates.