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Fe-Ai-Al powder core annular magnet and preparation method thereof

A ring magnet, fe-si-al technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of high loss, achieve the effect of low pressing pressure, simple manufacturing process, and short holding time

Active Publication Date: 2016-11-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic permeability of magnetic powder cores made by different heat treatment temperatures, pressures and binder contents is 39.4-42.9, and the loss at 100kHz and 50mT is 332mW / cm 3 -349mW / cm 3 , the loss is significantly higher

Method used

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  • Fe-Ai-Al powder core annular magnet and preparation method thereof
  • Fe-Ai-Al powder core annular magnet and preparation method thereof
  • Fe-Ai-Al powder core annular magnet and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Step 1: SEM test the original Fe-Si-Al alloy powder (see figure 1 ) And VSM hysteresis loop test (see figure 2 ).

[0036] Step 2: Pour the original Fe-Si-Al alloy powder into an acetone solution containing a coupling agent (silane coupling agent KH-550) and stir evenly, wherein the mass of the coupling agent accounts for 0.5% of the total mass of the magnetic powder. Then place it in a vacuum drying oven for drying.

[0037] Step 3: Add 7wt% insulating binder to the dried powder, the composition of which is silicone resin, kaolin and α-Al 2 O 3 , Of which kaolin and α-Al 2 O 3 It belongs to the addition of inorganic substances, and it is dried again after stirring. Wherein m (silicone resin): m (nano alumina and kaolin) = 2:1, m (nano alumina): m (kaolin) = 1:1.

[0038] Step 4: Press the configured mixed powder under a pressure of 1600Mpa to form a magnetic ring with an outer diameter of 20mm, an inner diameter of 12mm, and a height of about 4.5mm. The microstructure morp...

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Abstract

The invention discloses a Fe-Ai-Al powder core annular magnet and a preparation method thereof. The preparation method comprises the following steps: (1) pouring original Fe-Ai-Al alloy powder into an acetone solution containing a coupling agent and uniformly stirring; putting the uniformly-stirred alloy powder into a vacuum drying box and drying; (2) adding an insulating additive into the dried powder; after uniformly stirring, drying again, wherein the insulating additive is a mixture of organic silicon resin, nano aluminum oxide and kaolin; (3) pressing the prepared mixed powder into a magnet ring; and (4) keeping the heat of the magnet ring at 350 DEG C-450 DEG C for 20min-40min, carrying out heat treatment and cooling along a furnace to obtain Fe-Ai-Al magnetic powder core. The magnetic powder core disclosed by the invention has good properties, a simple preparation process and low cost and is applicable to industrial production.

Description

Technical field [0001] The invention belongs to the technical field of magnetic materials, and specifically relates to a method for preparing a low-loss Fe-Si-Al powder core ring magnet. Background technique [0002] Sendust alloy, also known as Sendust alloy, was invented by the Japanese in Sendai Prefecture in the 1930s. In the early 1980s, sendust magnetic alloys were made into magnetic powder cores (also known as Sendust magnetic powder cores), usually represented by CS. The magnetic performance of sendust magnetic powder core is similar to that of high flux magnetic powder core, and its loss is lower than that of high flux magnetic powder core, but its price is much cheaper. Therefore, in recent years the use has become more and more widespread. Wherever MPP and high flux magnetic powder cores can be replaced, sendust magnetic powder cores can be used as much as possible. The standard composition of Fe-Si-Al alloy is: Al5.4%; Si9.6%; the rest is iron. The control range o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/147B22F1/00
CPCH01F1/14791H01F41/0266B22F1/10
Inventor 曾德长王进郑志刚余红雅肖方明
Owner SOUTH CHINA UNIV OF TECH
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