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Method of producing high-performance complex-shape pure iron soft magnetic products

A complex shape, high-performance technology, applied in the field of powder metallurgy, can solve the problems of reducing the saturation magnetic induction intensity of materials, damaging the magnetic properties of materials, and high equipment requirements, reducing equipment requirements, saving resources and energy, and overcoming easy deformation. Effect

Active Publication Date: 2013-12-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of this method is that the hot pressing or hot isostatic pressing process requires high equipment, and it is difficult to achieve low-cost and large-scale production of products.
The US patent (US005963771A) introduced the method of adding phosphorus to increase the density of the material. Adding phosphorus can form liquid phase sintering, promote the densification of the material, and improve the density and performance of the material. However, due to the addition of phosphorus as an alloying element, the material will be reduced The saturated magnetic induction intensity of the material is damaged, and the magnetic properties of the material are damaged. In addition, the liquid phase sintered product is easy to deform, and the dimensional accuracy is not easy to control

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  • Method of producing high-performance complex-shape pure iron soft magnetic products
  • Method of producing high-performance complex-shape pure iron soft magnetic products

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Using carbonyl iron powder as raw material powder, the binder is composed of 55% paraffin, 25% high density polyethylene, 15% polypropylene and 5% stearic acid. The powder and the binder are mixed uniformly according to the volume ratio of the powder to be 58%, and then the feed is made. The feed is formed on an injection molding machine. The molding parameters are: injection temperature 150 ℃, injection pressure 85MPa, injection speed 80%, pressure holding The time is 4s, and the formed blank is obtained. Firstly, the formed blank is immersed in n-heptane for 4 hours of solvent degreasing. After drying the solvent-degreased blank, the solution and degreasing blank is thermally degreased in the temperature range of room temperature to 650°C, and the degreased blank is sintered in hydrogen at a temperature of 1450°C. Within 2 hours, a high-performance, high-dimensional precision pure iron soft magnetic alloy product was prepared. The density of the obtained pure iron so...

Embodiment 2

[0021] Using carbonyl iron powder as raw material powder, the binder is composed of 60% paraffin, 30% high density polyethylene and 10% stearic acid. The powder and the binder are mixed uniformly according to the volume ratio of the powder to be 60%, and then the feed is made. The feed is formed on an injection molding machine. The molding parameters are: injection temperature 155 ° C, injection pressure 90 MPa, injection speed 80%, pressure holding The time is 4s, and the formed blank is obtained. Firstly, the formed blank is immersed in n-heptane for 4 hours of solvent degreasing. After drying the solvent-degreased blank, the solution and degreasing blank is thermally degreased in the temperature range of room temperature to 650°C, and the degreased blank is sintered in hydrogen at a temperature of 1450°C. Within 4 hours, a high-performance, high-dimensional precision pure iron soft magnetic alloy product was prepared. The density of the obtained pure iron soft magnetic pro...

Embodiment 3

[0023] Using carbonyl iron powder as raw material powder, the binder is composed of 60% paraffin, 25% high density polyethylene, 5% polystyrene and 10% stearic acid. The powder and the binder are mixed uniformly according to the volume ratio of the powder to be 60%, and then the feed is made. The feed is formed on an injection molding machine. The molding parameters are: injection temperature 155 ° C, injection pressure 90 MPa, injection speed 80%, pressure holding The time is 4s, and the formed blank is obtained. Firstly, the formed blank is soaked in trichloroethylene for 4 hours, and then the solvent-degreased blank is dried, and then thermally degreased in the temperature range of room temperature to 600°C, and the degreased blank is sintered in hydrogen at a temperature of 1450°C. Within 6 hours, a high-performance, high-dimensional precision pure iron soft magnetic alloy product was prepared. The density of the obtained pure iron soft magnetic product is 7.87g / cm 3 , t...

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Abstract

The invention relates to a method of producing high-performance complex-shape pure iron soft magnetic products and belongs to the field of powder metallurgy. The method includes the steps of using carbonyl iron powder as raw material, well mixing the carbonyl iron powder with proper binder to obtain well rheological feed, making the feed into complex-shape blanks by means of powder injection moulding, removing the binder from the injected blanks by solvent degreasing and thermal degreasing, sintering the degreased blanks at the temperature of 1400-1500 DEG C to obtain pure iron soft magnetic products high in density, high in performance and complex in shape. The method has the advantages that the pure iron soft magnetic products larger than 99% in density, larger than 1.75T in magnetic induction intensity B5000, smaller than 35A / m in coercivity and larger than 15mH / m in maximum magnetic permeability can be produced by powder injection moulding and phase change activated sintering; the products has the highest performance amongst pure iron soft magnetic materials produced by the existing powder injection moulding methods.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and particularly provides a method for preparing high-performance complex-shaped pure iron soft magnetic products. Background technique [0002] Pure iron is a metal soft magnetic material with the earliest application and the cheapest price. It has a high saturation magnetic induction intensity (Bs=2.15T) and a high Curie temperature (T C =770℃), is widely used in power and electronics industries. With the development of magnetic circuit components towards miniaturization and multi-function, the size of the soft magnetic alloy components used is getting smaller and smaller, and the shape is getting more and more complex. Using traditional machining methods to prepare these soft magnetic alloy parts has the disadvantages of large waste of raw materials, long cycle, high cost and low efficiency. [0003] Soft magnetic products prepared by powder metallurgy process have the characterist...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/10
Inventor 秦明礼田璐莎麻季冬张晓峰章林曲选辉
Owner UNIV OF SCI & TECH BEIJING
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