CN105458249A - Method for manufacturing high-magnetic-conductivity sintered iron-based soft magnetism product - Google Patents
Method for manufacturing high-magnetic-conductivity sintered iron-based soft magnetism product Download PDFInfo
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- CN105458249A CN105458249A CN201510833337.5A CN201510833337A CN105458249A CN 105458249 A CN105458249 A CN 105458249A CN 201510833337 A CN201510833337 A CN 201510833337A CN 105458249 A CN105458249 A CN 105458249A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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Abstract
The invention discloses a method for manufacturing a high-magnetic-conductivity sintered iron-based soft magnetism product. The method includes the following steps of raw material powder preparing, wherein adopted iron powder is atomized iron powder or reduced iron powder, and the powder granularity ranges from 50 micrometers to 150 micrometers; high-speed pressing and forming, wherein the iron powder is pressed and formed on a high-speed pressing and forming machine, and a pressed blank with the density not lower than 7.5g/cm<3> is obtained; and sintering and heat treatment, wherein the pressed blank is sintered and heat-treated at the temperature of 1400 DEG C to 1500 DEG C for 0.5 hour to 10 hours. According to the method, the high-density pressed blank is obtained firstly through the high-speed pressing technology, the density of a material is further increased through delta phase strengthening sintering to promote grains to grow, the structure is perfected, and the manufactured product is large in density, high in relative density and magnetic conductivity and lower in coercive force.
Description
Technical field
The invention belongs to powder metallurgical technology, provide a kind of method preparing high magnetic permeability sintered iron base soft magnetic products.
Background technology
Pure iron be a kind of application the earliest, metal soft magnetic material that price is the most cheap, it has comparatively high saturated magnetic induction (Bs=2.15T) and comparatively high-curie temperature (T
c=770 DEG C), be widely used in electric power and electronics industry.Along with magnetic circuit components and parts are to microminiaturized, multifunction future development, the size of the magnetically soft alloy parts used is more and more less, and shape also becomes increasingly complex.Adopt traditional machining process to prepare these magnetically soft alloy parts, there is waste of raw materials large, the cycle is long, and cost is high, inefficient shortcoming.
Powder metallurgical technique prepares the feature that soft magnetic products has near-net-shape, and prepared product does not need or only need trace processing, is the technology of preparing of a kind of economize energy and resource, low cost, is widely used in the preparation of soft magnetism parts.The disadvantage that powder metallurgy process prepares soft magnetic materials is that density is low, and microstructure is undesirable owing to there is some holes in product, affects by hole and crystal boundary, causes the magnetic property (especially magnetic conductivity) of material far below tradition casting forging material.Such as, the density of pure iron soft magnetic materials that prepared by traditional pressing methods is usually less than 7.2g/cm
3, the solid density being relatively no more than density 92%(pure iron is 7.87g/cm
3), the magnetic conductivity of material is not usually higher than 5mH/, and casting forging pure iron density is 100%, and maximum permeability is greater than 15mH/m, is about 3 times of prior powder metallurgy pure iron soft magnetism.For soft magnetic products, usually wish that the magnetic conductivity of material and magnetic induction intensity want high, coercivity is low, thus improves function and efficiency, realizes the miniaturization of device, lightweight and high performance.
In order to improve density and the magnetic property of powder metallurgy soft magnetic material, Chinese patent (ZL201010216980.0) describes the density adopting hot pressing or high temperature insostatic pressing (HIP) method to improve material, and the magnetic property of material is improved by subsequent heat treatment, the major defect of the method is that hot pressing or heat and other static pressuring processes are high to equipment requirement, is difficult to realize the low cost of product, produces on a large scale.Chinese patent (ZL201310240381.6) describes a kind of method that powder metallurgy prepares pure iron and iron phosphorus soft magnetic products, mainly by blending powder, plasticising process thus improve powder compression molding, prepare high density pressed compact, and then prepare high-performance and high accuracy iron-base soft magnetic alloy, the method needs to adopt atomized iron powder to be raw material, obtained the formed powder raw material of high fluidity and high-compressibility by techniques such as blending powder, plasticizing heat treatments, technique is more complicated.Chinese patent (Application Number (patent): CN201310400060.8) describes and a kind ofly adopts the method preparing high-performance complicated shape pure iron soft magnetism, the method adopts carbonyl iron dust to be raw material, injection molding technology is utilized to prepare complicated shape and high performance pure iron soft magnetic products, the method needs to adopt price carbonyl iron dust costly to make raw material, cost is higher, and technique is more complicated also.United States Patent (USP) (US005963771A) describes the density adopting the method for adding P elements to improve material, phosphorate and can form transient liquid phase sintering, promote the densified of material, improve density and the performance of material, but adding due to alloying element phosphorus, the Saturation magnetic sense intensity of material can be reduced, the magnetic property of infringement material, in addition, liquid-phase sintering product is easily deformable, and dimensional accuracy is wayward.
Summary of the invention
The object of the present invention is to provide a kind of method preparing high magnetic permeability sintered iron base soft magnetic products, the product density prepared is large, and relative density is high, and magnetic conductivity is high, and coercivity is low.
The present invention realizes foregoing invention object, and the technical scheme that method adopts preparing high magnetic permeability sintered iron base soft magnetic products is:
Prepare a method for high magnetic permeability sintered iron base soft magnetic products, comprise the steps:
A, material powder: adopt iron powder to be atomized iron powder or reduced iron powder, powder size is 150 ~ 50 μm;
B, high-speed pressing and forming: iron powder is compressing on high-speed pressing and forming machine, obtain density and be not less than 7.5g/cm
3pressed compact; By iron powder on high-speed pressing and forming machine, pressing speed can be adjusted as required, also can adopt the method for repeatedly suppressing, obtain density and be not less than 7.5g/cm
3pressed compact;
E, sintering and heat treatment: pressed compact is carried out at the temperature of 1400-1500 DEG C sintering and heat treatment 0.5 ~ 10 hour; Prepare the iron-based soft magnetic product of high density and high magnetic permeability.
Sintering and heat treatment after drop to 1000 DEG C with the rate of temperature fall of 3 DEG C/min after cool to room temperature with the furnace.
The density of product is greater than 7.8g/cm
3, relative density is greater than 99%, and maximum permeability is greater than 12mH/m, and coercivity is less than 60A/m, B
6000be greater than 1.70T.
Powder high-speed pressing and forming combines with intensified-sintered technology to prepare high density and and high-performance iron-based soft magnetic products by the present invention.First utilize high velocity compacting technique to obtain highly dense pressed compact, recycling phase transformation strengthening sintering improves the density of material further, promotes growing up of crystal grain, improves heterogeneous microstructure, prepare even tissue, high density and high performance iron-based soft magnetic product.
High velocity compacted is a kind of new high density forming technique that development in recent years is got up, it utilizes impact energy to be shaped to compacting power conversion and the feature of stress wave propagation energy accumulation, has pressed density high and be evenly distributed that (it is 7.5g/cm that this technology can obtain density
3even higher pressed compact, and the blank density of conventional moulded is at 7.0g/cm
3left and right), curring time is short, can repeat compacting, it is high and be evenly distributed to damage density by pressure, damages that elastic after effect effect is low, production cost is low, cost performance is high by pressure, and production efficiency is high, can the feature such as production large scale, large weight parts.Although high velocity compacting technique can obtain 7.5g/cm
3the pressed compact of left and right, but relative density is only 95%, and still there is the hole of about 5% in material internal, these holes still can affect domain rotation, worsens the magnetic property of material.Therefore, for improving density of material further, pressed compact, on the basis obtaining highly dense pressed compact, carries out sintering and heat treatment by this patent at higher than the temperature of 1400 DEG C.When temperature is higher than 1394 DEG C, iron is body-centered cubic lattice δ phase by face-centered cubic γ phase in version, and because body-centered cubic atom density is little, the diffusion rate of δ phase is fast, is the hundred times of γ phase.Therefore, by sintering temperature higher than 1400 DEG C, make pure iron be in δ phase region, the fast diffusion speed of higher sintering temperature, δ phase and the Hedvall effect of transformation temperature can be utilized, further promote growing up of the densified of material and crystallite dimension, promote the magnetic property of material.
Feature of the present invention is that high velocity compacted combines with phase transformation strengthening sintering technology and prepares high-performance iron-based soft magnetic, first high velocity compacting technique is utilized to obtain high density pressed compact, the density of the intensified-sintered further raising material of recycling δ phase, promote grain growth, improve tissue, density can be prepared and be greater than 7.8g/cm
3(relative density is greater than 99%), maximum permeability is greater than 12mH/m, and coercivity is less than 60A/m, B
6000be greater than the soft magnetic products of 1.70T.
Detailed description of the invention
embodiment:
Using 100 order water-atomized iron powders as raw material, the HYP35-2 type high speed impact shaping press using HydropulsorAB company of Sweden to produce is suppressed, pressing speed is 9.4m/s, uses lithium stearate to carry out die wall lubrication in pressing process, and gained green density is 7.63g/cm
3.After pressed compact is sintered 4 hours at 1450 DEG C of temperature, cool to room temperature after dropping to 1000 DEG C with the rate of temperature fall of 3 DEG C/min, the density of gained pure iron soft magnetic products is 7.84g/cm
3, maximum permeability is 17.2mH/m, magnetic induction density B
6000for 1.78T, coercivity is 36.1A/m.
Using the reduced iron powder of 150 μm as raw material, the HYP35-2 type high speed impact shaping press using HydropulsorAB company of Sweden to produce is suppressed, pressing speed is 9.4m/s, uses lithium stearate to carry out die wall lubrication in pressing process, and gained green density is 7.63g/cm
3.After pressed compact is sintered 0.5 hour at 1400 DEG C of temperature, cool to room temperature after dropping to 1000 DEG C with the rate of temperature fall of 3 DEG C/min, the density of gained pure iron soft magnetic products is 7.81g/cm
3, maximum permeability is 16.2mH/m, magnetic induction density B
6000for 1.76T, coercivity is 37.2A/m.
Using the reduced iron powder of 50 μm as raw material, the HYP35-2 type high speed impact shaping press using HydropulsorAB company of Sweden to produce is suppressed, pressing speed is 9.4m/s, uses lithium stearate to carry out die wall lubrication in pressing process, and gained green density is 7.63g/cm
3.After pressed compact is sintered 10 hours at 1500 DEG C of temperature, cool to room temperature after dropping to 1000 DEG C with the rate of temperature fall of 3 DEG C/min, the density of gained pure iron soft magnetic products is 7.86g/cm
3, maximum permeability is 18.2mH/m, magnetic induction density B
6000for 1.77T, coercivity is 35.1A/m.
comparative example 1:
Using 100 order water-atomized iron powders as raw material, the HYP35-2 type high speed impact shaping press using HydropulsorAB company of Sweden to produce is suppressed, pressing speed is 9.4m/s, uses lithium stearate to carry out die wall lubrication in pressing process, and gained green density is 7.63g/cm
3.Pressed compact is sintered 4 hours at 1150 DEG C of temperature, cools to room temperature with the furnace, the density of gained pure iron soft magnetic products is 7.60g/cm
3, maximum permeability is 8.2mH/m, magnetic induction density B
6000for 1.68T, coercivity is 136.1A/m.
comparative example 2:
Using 100 order water-atomized iron powders as raw material, adopt conventional moulded method to be shaped, pressing pressure 680MPa, uses lithium stearate to carry out die wall lubrication in pressing process, gained green density is 7.02g/cm
3.After pressed compact is sintered 4 hours at 1450 DEG C of temperature, cool to room temperature after dropping to 1000 DEG C with the rate of temperature fall of 3 DEG C/min, the density of gained pure iron soft magnetic products is 7.44g/cm
3, maximum permeability is 6.8mH/m, magnetic induction density B
6000for 1.57T, coercivity is 148A/m.
comparative example 3:
Using 100 order water-atomized iron powders as raw material, adopt conventional moulded method to be shaped, pressing pressure 680MPa, uses lithium stearate to carry out die wall lubrication in pressing process, gained green density is 7.02g/cm
3.Pressed compact is sintered 4 hours at 1150 DEG C of temperature, cools to room temperature with the furnace, the density of gained pure iron soft magnetic products is 7.03g/cm
3, maximum permeability is 3.2mH/m, magnetic induction density B
6000for 1.35T, coercivity is 185A/m.
Claims (3)
1. prepare a method for high magnetic permeability sintered iron base soft magnetic products, it is characterized in that, comprise the steps:
A, material powder: adopt iron powder to be atomized iron powder or reduced iron powder, powder size is 150 ~ 50 μm;
B, high-speed pressing and forming: iron powder is compressing on high-speed pressing and forming machine, obtain density and be not less than 7.5g/cm
3pressed compact;
E, sintering and heat treatment: pressed compact is carried out at the temperature of 1400-1500 DEG C sintering and heat treatment 0.5 ~ 10 hour.
2. the method preparing high magnetic permeability sintered iron base soft magnetic products according to claim 1, is characterized in that: sintering and heat treatment after drop to 1000 DEG C with the rate of temperature fall of 3 DEG C/min after cool to room temperature with the furnace.
3. the method preparing high magnetic permeability sintered iron base soft magnetic products according to claim 1 and 2, is characterized in that: the density of product is greater than 7.8g/cm
3, relative density is greater than 99%, and maximum permeability is greater than 12mH/m, and coercivity is less than 60A/m, B
6000be greater than 1.70T.
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| CN201510833337.5A CN105458249A (en) | 2015-11-26 | 2015-11-26 | Method for manufacturing high-magnetic-conductivity sintered iron-based soft magnetism product |
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| CN201510833337.5A CN105458249A (en) | 2015-11-26 | 2015-11-26 | Method for manufacturing high-magnetic-conductivity sintered iron-based soft magnetism product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109719760A (en) * | 2018-12-25 | 2019-05-07 | 杭州巨星科技股份有限公司 | Powder metallurgy jackknife and its manufacturing process |
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| US6537489B2 (en) * | 2000-11-09 | 2003-03-25 | Höganäs Ab | High density products and method for the preparation thereof |
| CN1516629A (en) * | 2001-06-13 | 2004-07-28 | 赫加奈斯公司 | Method for preparation of high density soft magnetic products |
| CN1902719A (en) * | 2003-12-29 | 2007-01-24 | 霍加纳斯股份有限公司 | Powder composition, method for making soft magnetic components and soft magnetic composite component |
| JP2007138273A (en) * | 2004-11-25 | 2007-06-07 | Jfe Steel Kk | Method for producing high density iron-based compacted body and high strength and high density iron-based sintered body |
| CN101246773A (en) * | 2007-02-12 | 2008-08-20 | 北京有色金属研究总院 | High-efficiency soft magnetic material and method for producing the same |
| CN103464759A (en) * | 2013-09-05 | 2013-12-25 | 北京科技大学 | Method of producing high-performance complex-shape pure iron soft magnetic products |
| CN104841938A (en) * | 2015-05-26 | 2015-08-19 | 北京科技大学 | Production method for high-performance special-shaped iron-cobalt soft magnetic alloy parts |
-
2015
- 2015-11-26 CN CN201510833337.5A patent/CN105458249A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6537489B2 (en) * | 2000-11-09 | 2003-03-25 | Höganäs Ab | High density products and method for the preparation thereof |
| CN1516629A (en) * | 2001-06-13 | 2004-07-28 | 赫加奈斯公司 | Method for preparation of high density soft magnetic products |
| CN1902719A (en) * | 2003-12-29 | 2007-01-24 | 霍加纳斯股份有限公司 | Powder composition, method for making soft magnetic components and soft magnetic composite component |
| JP2007138273A (en) * | 2004-11-25 | 2007-06-07 | Jfe Steel Kk | Method for producing high density iron-based compacted body and high strength and high density iron-based sintered body |
| CN101246773A (en) * | 2007-02-12 | 2008-08-20 | 北京有色金属研究总院 | High-efficiency soft magnetic material and method for producing the same |
| CN103464759A (en) * | 2013-09-05 | 2013-12-25 | 北京科技大学 | Method of producing high-performance complex-shape pure iron soft magnetic products |
| CN104841938A (en) * | 2015-05-26 | 2015-08-19 | 北京科技大学 | Production method for high-performance special-shaped iron-cobalt soft magnetic alloy parts |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109719760A (en) * | 2018-12-25 | 2019-05-07 | 杭州巨星科技股份有限公司 | Powder metallurgy jackknife and its manufacturing process |
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Address after: 225008 Jiangsu province Hanjiang District of Yangzhou City Jiangyang Industrial Park Lotus Road No. 90 Applicant after: Yangzhou Haichang new materials Limited by Share Ltd Address before: 225008 Jiangsu province Hanjiang District of Yangzhou City Jiangyang Industrial Park Lotus Road No. 90 Applicant before: Yangzhou Seashine Powder Metallurgy Co., Ltd. |
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