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Manufacturing method of Fe-6.5Si alloy powder and manufacturing method of magnetic powder core

A technology of fe-6.5si and alloy powder, which is applied in the field of magnetic powder core manufacturing, can solve the problems of low yield and failure to realize industrial production, and achieve good formability and compressibility

Inactive Publication Date: 2007-08-08
武汉欣达磁性材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The saturation magnetic induction of this alloy B s It is about 18000 gauss, and the resistivity is about 82 microohm.cm, which is almost twice as high as that of Fe-3% Si (silicon steel sheet), so the eddy current loss is very small, and it should be a good soft magnetic material. It has been studied many times , the conclusion is that it is impossible to use the ordinary cold rolling method for processing, and the warm rolling method must be used, and the yield rate is low and industrial production cannot be realized.

Method used

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  • Manufacturing method of Fe-6.5Si alloy powder and manufacturing method of magnetic powder core
  • Manufacturing method of Fe-6.5Si alloy powder and manufacturing method of magnetic powder core

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Put industrial pure iron, crystalline silicon, sponge titanium (or ferroniobium) into a nominal 50 kg vacuum induction furnace for smelting, and cast it into an alloy steel ingot with a chemical composition of 6.2% silicon, 0.3% titanium, and more than 0.02% C being Fe , use the hammering method to break it into material blocks below 40mm, put it into the jaw crusher and crush it into small pieces less than 5mm, and then enter the vibrating ball mill to grind it into alloy powders less than 120 mesh, and put it in a hydrogen-protected box-type electric furnace 900 Incubate at ℃ for 6 hours for annealing treatment, sieve with a vibrating sieve machine, and carry out particle size distribution according to the ratio of -120 mesh to +200 mesh accounting for 30%, -200 mesh to +300 mesh accounting for 50%, and -300 mesh accounting for 20%. Ratio, according to phosphoric acid 5%+ acetone 95% mass percent is made into solution again by the mass percent of alloy powder 94%, phos...

Embodiment 2

[0028] The process flow is the same as Example 1, the smelting composition is Si6.98%, Ti0.5%, C0.012%, and the rest is Fe. After being broken into alloy powder, the temperature is 1050 ° C, and the hydrogen reduction annealing treatment is kept for 3 hours, according to -120 mesh ~ +200 mesh accounts for 20%, -200 mesh to +300 mesh accounts for 60%, and -300 mesh accounts for 20% for particle size ratio. Make a solution with 15% acetone phosphate (that is, 15% phosphoric acid + 85% acetone), mix 98% of the alloy powder, 2% of the above acetone phosphate solution, and keep stirring until the acetone is completely volatilized and the alloy powder is dry before adding Insulation agent 0.4% kaolin, 0.6% FK155 adhesive, 0.2% M 0 S 2 After the lubricant is evenly mixed, then mix evenly with 0.8% barium stearate (release agent), and then it can be loaded into the feeding box of a 100t hydraulic dry powder automatic molding machine, according to 21t / cm 2 Compression molding under p...

Embodiment 3

[0030] The process flow is the same as in Example 1. The smelting chemical composition is shown in the table below. The annealing temperature of the alloy powder is 950°C for 4 hours and the concentration of acetone phosphate is 10%. The addition amount is 4% (mass percentage) of the alloy powder. Its chemical composition changes and magnetic properties are shown in Table 3:

[0031] chemical composition

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Abstract

The making of Fe-6.5Si alloy magnetic powder core comprises grain proportion, alloy powder inactivating, adding insulation agent to the metal powder, binder, lubricant and stripping agent, compression, heat treatment, solidification, surface coating, with the inactivating treatment getting phosphopyruvic acid with 5-15% phosphate chrome, the rest being acetone, adding alloy powder with 2-6% of mass percentage. Adding small quantity Ti nor Ni, it can reach the saturated alloy magnetic sensing strength BS value of 16000- 18000 Gaussian, coercitive force <=80A / m. It has better forming and compression feature. It reduces broken stress. The made magnetic powder core having magnetic conductivity of 125, with low metal core consumption.

Description

technical field [0001] The invention belongs to the manufacturing method of magnetic objects, especially the manufacturing method of Fe-6.5Si alloy powder and the manufacturing method of the magnetic powder core molded by using the alloy powder. This kind of magnetic powder core is mainly suitable for the iron core of PFC inductor and output filter inductor in switching power supply and UPS, and the iron core of differential mode inductor in EMI filter. Background technique [0002] With the development of the electronics industry, various switching power supplies are widely used in control systems, in which various magnetic powder cores are required. Inexpensive pure iron cores have been used in large quantities, but their magnetic permeability is low (usually μe≈75) and the core loss is relatively large. Nickel-containing permalloy magnetic powder cores, although good in performance, are expensive and their use is limited. The sendust magnetic powder core is moderately p...

Claims

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Application Information

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IPC IPC(8): B22F9/02B22F1/00
Inventor 刘志文王锋
Owner 武汉欣达磁性材料有限公司
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