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Heat treatment of soft magnetic components

A heat treatment method and component technology, which is applied in the fields of electrical components, inorganic material magnetism, inductance/transformer/magnet manufacturing, etc., can solve problems such as changes in magnetic properties and flaws on the surface of components

Inactive Publication Date: 2007-08-08
HOGANAS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A problem that arises when heat treating SMC components made from powder metallurgy is that the magnetic properties change depending on the heat treatment conditions
Another problem observed in industrial production is: blemishes on component surfaces

Method used

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  • Heat treatment of soft magnetic components
  • Heat treatment of soft magnetic components
  • Heat treatment of soft magnetic components

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] By pressing Somaloy500 with continuous coating TM Pure iron-based powder and 0.5% Kenolube TM The lubricant produced a magnetic ring with an inner diameter of 45mm, an outer diameter of 55mm and a height of 5mm. The pressing pressure is 800MPa, and 7.35g / cm 3 compacted density. The rings were heat treated in air at 500°C in a continuous production furnace at different CO concentrations obtained by adjusting the gas flow through the furnace.

[0027] The initial permeability is measured as a function of frequency. The ability of the resulting SMC components to maintain their initial permeability at higher frequencies is known as frequency stability.

[0028] Figure 1 shows that the frequency stability is higher for materials heat-treated at lower CO concentrations. Acceptable values ​​for frequency stability are obtained for CO concentrations of 0.25% and below.

[0029] The total loss was measured at the same time and Figure 2 shows the total loss for the material...

example 2

[0031] Cylindrical SMC components with a diameter of 80 mm, a height of 30 mm and a weight of about 1 kg were produced using the same iron-based powder mixture as in Example 1, and were heat treated at two different furnace temperatures, namely 500°C and 600°C . For the components subjected to heat treatment at 500° C., the heat treatment was terminated after 30 minutes and 55 minutes, respectively. For the components heat-treated at 600°C, the process ended after 28 minutes.

[0032] Figure 3 shows the temperature profile of the component, and it can be deduced that the temperature of the component heat-treated at a furnace temperature of 600°C reaches 550°C after 28 minutes.

[0033] Figure 4 shows that components heat-treated at 500°C for 55 minutes and components heat-treated at 600°C for 28 minutes can achieve the same magnetic permeability, while components heat-treated at 500°C for 30 minutes before the frequency reaches 80kHz low magnetic permeability.

[0034] The ...

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Abstract

The present invention concerns a method of improving the properties of powder metallurgically produced SMC compacted body consisting of a soft magnetic material of insulated powder particles and an organic lubricant, to a stress relieving heat treatment in a furnace until the component has reached a temperature of at least 400 DEG C in an oxygen containing atmosphere having a CO content is less than 0.25 % by volume.

Description

technical field [0001] The invention relates to soft magnetic composite material components. More specifically, the invention relates to a method of improving the properties of soft magnetic composite material components by controlling the conditions during the heat treatment of such components. Background technique [0002] Soft magnetic materials are used as core materials in, for example, inductors, stators, rotors, generators, actuators and sensors. Typically, soft magnetic cores - such as rotors and stators in electric motors - are made of stacked steel sheets. Soft magnetic composites (SMC) are based on soft magnetic particles, usually iron-based, with an electrically insulating coating on each particle. SMC parts are made by pressing insulating particles together with lubricants and / or binders using conventional powder metallurgy processes. Since the SMC material can carry a three-dimensional magnetic flux, and since the three-dimensional shape can be obtained thro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/22H01F1/24C22C33/02B22F1/102B22F3/24H01F41/02
CPCB22F1/0062B22F2998/10B22F2003/241H01F41/0246B22F3/24H01F1/24B22F2003/248B22F2999/00B22F2998/00B22F1/102B22F2201/04B22F3/1007
Inventor 叶舟P·拉松H·安德松L·胡尔特曼
Owner HOGANAS AB