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

A technology with high stability and manufacturing method, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic materials, magnetic objects, etc., can solve the problem that the electromagnetic performance stability and bonding force of iron-nickel-molybdenum magnetic powder cores are greatly affected, and thermal stress cannot be eliminated. Sufficient, unstable physical properties and other problems, to achieve the effect of temperature insensitivity, clear performance source, small residual physical stress and thermal stress

Active Publication Date: 2018-04-03
江苏五三二科技有限公司
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  • Application Information

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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.

Method used

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Embodiment 1

[0033] A highly stable molybdenum permalloy magnetic core, the composition of the molybdenum permalloy magnetic core contains 3.2%-3.8% molybdenum, 15.8%-17.2% iron, and 79%-81% nickel by weight ratio; The surface flatness of Permal magnetic core is not higher than 0.01μm, the parallelism of both sides is not higher than 0.01μm, and the porosity is not more than 2%.

[0034] The manufacturing method of the above-mentioned highly stable molypermal magnetic core comprises the following steps:

[0035] 1) Raw material preparation

[0036] ①Select molybdenum permalloy original magnetic powder containing 3.2%-3.8% molybdenum, 15.8%-17.2% iron, and 79%-81% nickel by weight;

[0037] ②Prepared process equipment includes: hot pressing metal mold made of 1Cr12MoV with a hardness range of 60-65HRC; a metal stamping die with a WC-based wear-resistant coating on the inner surface. The metal stamping die is made of 1Cr17Ni2 with a hardness range of 33 -38HRC; Made of 1Cr17Ni2, high tempe...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147H01F41/02C22F1/10C22C19/03
CPCC22C19/03C22F1/10H01F1/14741H01F41/0246
Inventor 何琳
Owner 江苏五三二科技有限公司
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