A kind of highly stable molypermal magnetic core and its manufacturing method

Abstract

The invention discloses a high-stability molybdenum permalloy magnetic core and a manufacturing method thereof. The high-stability molybdenum permalloy magnetic core a is obtained through a plurality of paths of procedures of hot-pressing molding, cold-rolling molding, annealing, stress relieving, hot-cold cycling impacting, transverse magnetic field heat treatment, surface oxidization and the like; an inductance stability numerical value is not higher than 0.03% and an initial inductance deviation range numerical value is not higher than 0.3%. The molybdenum permalloy magnetic core manufactured by the manufacturing method of the high-stability molybdenum permalloy magnetic core has the advantages of clear resources, high stability, insensitivity on temperatures, good binding force, uneasiness of deforming and small residual magnetic flux.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a highly stable molypermal magnetic core and a manufacturing method thereof. Background technique [0002] Magnetic core: A magnetic core refers to a sintered magnetic metal oxide composed of various iron oxide mixtures. For example, manganese-zinc ferrite and nickel-zinc ferrite are typical core body materials. Manganese-zinc ferrite has the characteristics of high magnetic permeability and high magnetic flux density, and has low loss characteristics at frequencies below 1MHz. Nickel-zinc ferrite has the characteristics of extremely high resistivity, low magnetic permeability of less than a few hundred, and low loss at frequencies higher than 1MHz. Ferrite cores are used in coils and transformers in various electronic devices. [0003] Molybdenum material has high magnetic permeability, saturation magnetic induction intensity and low coercive force and resistivity, mainly...

AI Technical Summary

Problems solved by technology

[0004] Among the relevant patents that have been applied in China, the patent "A Preparation Method of High Magnetic Permeability Iron-Nickel-Molybdenum Magnetic Powder Core" (application number: 201410717731.8, publication date: 2015-04-29) discloses a high magnetic permeability The preparation method of iron-nickel-molybdenum magnetic powder core, but it is formed by water-soluble process and binder, which has poor stability and has a negative effect on the electromagnetic performance stability and binding force of the final iron-nickel-molybdenum magnetic powder core (ie molybdenum magnetic core). The impact is relatively large, and because the iron-nickel-molybdenum magnetic powder core of the invention does not give the ratio of iron, nickel, and molybdenum content, the disclosure is not clear, making its so-called high magnetic permeability performance a tree without roots and water without a source. On the other hand, due to the annealing at 550-600°C, which does not exceed the Curie temperature, the iron-nickel-molybdenum magnetic powder core (that is, the molybdenum permal magnetic core) prepared by the invention has a large residual magnetic flux and insufficient thermal stress relief. It is easy to deform when used, and its physical properties are unstable; because it has not been subjected to stress relief treatment for cold and hot cycles, it is relatively sensitive to temperature changes and its electromagnetic properties are also unstable.