CN108097963A - A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering - Google Patents

A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering Download PDF

Info

Publication number
CN108097963A
CN108097963A CN201711369169.4A CN201711369169A CN108097963A CN 108097963 A CN108097963 A CN 108097963A CN 201711369169 A CN201711369169 A CN 201711369169A CN 108097963 A CN108097963 A CN 108097963A
Authority
CN
China
Prior art keywords
powder
sintering
rolling
silicon steel
steel band
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201711369169.4A
Other languages
Chinese (zh)
Inventor
罗丰华
吴宁
薛丽珊
贾吉祥
李益民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central South University
Original Assignee
Central South University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Central South University filed Critical Central South University
Priority to CN201711369169.4A priority Critical patent/CN108097963A/en
Publication of CN108097963A publication Critical patent/CN108097963A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
    • 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
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

The method that the sintering of a kind of powder rolling and High temperature diffusion prepares high silicon steel band, it for 50~70% HIGH-PURITY SILICON iron powder is raw material that the present invention, which uses water-atomized iron powder and Si contents, formation Fe 4.5~6.7%Si mixed powders.Porous slab is formed by powder rolling; powder rolling slab is carried out to vacuum or protection of reducing atmosphere sintering at 1055~1155 DEG C; Fe powder particles is made to realize not exclusively connection; and Si and Fe realizations are partially-alloyed; form the high silicon steel blank of porous, incomplete alloying; subsequently through multiple cold rolling, not exclusively sintering; finally it is sintered in 1265~1325 DEG C of vacuum or protection of reducing atmosphere; realize the homogeneous alloy of high silicon steel; it is thick to obtain 0.1~0.5mm containing 4.5~6.7%Si, 7.35~7.50g/cm of density3High silicon steel band.

Description

A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering
Technical field
Preparation and manufacture field the invention belongs to metal material, and in particular to the powder of the high silicon steel soft magnetism band of high-performance Rolling and the method for sintering densification.
Technical background
Remanent magnetism and coercive force all very littles of soft magnetic material, i.e. hysteresis loop is very narrow, it and fundamental magnetization curve are almost It overlaps, is mainly used for the iron core of inductance coil, transformer, relay and motor.Fe-Si alloys maximum permeability is sent out with Si contents Changing, respectively Si mass percent it is (the same below) for 2% and 6.5% nearby there is the peak of two maximum permeabilities Value, respectively reaches 10000 and 25000.There is no absolute predominances, such as slope in soft magnetic materials for the maximum permeability of Fe-Si alloys The maximum permeability of alloy can not reach 200000.However the manufacture of the Fe-Si lattens of Si ＜ 4.5% is at low cost, therefore Silicon steel sheet is also known as electrical sheet or silicon steel thin slice, is a kind of very important magnetic material.
And Si>When 4.5%, below 540 DEG C of temperature B can occur for Fe-Si alloys2The eutectoid decomposition reaction of ordered phase, it is raw Into the unordered phases of α-Fe and DO3Ordered phase so that alloy becomes fragile and is difficult to deform.
For iron Si system alloy of the Si contents between 4.5~6.7%, commonly referred to as high silicon steel, wherein silicone content 6.5% High silicon steel it is mostly important.Its reason is Fe-Si alloy grains edge<100>The magnetostriction coefficient in direction increases with Si contents And reduce, it disappears substantially at about 6.3%, and<111>The magnetostriction coefficient in direction increases with Si contents and is increased, about When 6.1% with<100>The magnetostriction coefficient in direction is equal so that high silicon steel shows excellent low in higher frequency operation Iron loss characteristic.
The transformer of normal operation can occur continuous uniform " drone " sound, this is because alternating current by transformer around Group when, in the core between generate periodically variable alternating flux, cause iron core magnetostriction and shake the sound sent.Greatly The sound that the iron core of amount or large size is sent in vibrations not only causes the loss of energy, also creates noise pollution.Especially It is in the military aviations such as spacecraft, submarine and guided missile field, Fe-Si systems alloy plays particularly important role.20th century 60 Age Mo, the alloy of Si contents 6.5% are appeared in as transformer material on No. 11 airships of Apollo, are completed the mankind and are landed on the moon for the first time Heroic undertaking.As it can be seen that high silicon steel is the environment-friendly type soft magnetic materials of a kind of consumption reduction of function admirable, noise reduction.
Compared to other alloys, the research and development process of high silicon steel is relatively very long.Late 1920s A.Schulze is for the first time the study found that the iron Si system alloy of silicone content 6.5% has the almost nil characteristic of magnetostriction coefficient. In the 1980s, professor K.I.Arail etc. has found the high silicon steel alloy low compared to traditional Si content in exchange dynamic magnetic field In have lower iron loss and higher magnetic conductivity.Hereafter between many decades, in order to overcome the brittleness of high silicon steel, in technology of preparing side There are many trials in face.As the special rolled method of jacket or temperature control, rapid solidification method, chemical vapour deposition technique (CVD method), Plasma chemical vapor deposition (PCVD methods), hot dipping ooze a diffusion annealing method, powder metallurgic method, microalloying and are modified Etc. various methods.
Wherein CVD is the successful example of comparison.NKK companies of Japan in 1988 have produced thickness for the first time using CVD technology It spends for 0.1~0.5mm, width is the No yield point 6.5%Si steel discs of 400mm.Phase early 1990s, global first commercialization Can realize that the CVD production lines of continuous siliconising are developed, the product size of production can reach 0.1~0.3mm × 600mm。
The principle of CVD is：Under specific temperature conditions, silicon-containing gas (SiCl4) can react generation Fe- with silicon strip Si compounds, and to alloy diffusion inside alloy is finally made to reach required content by raised furnace temperature.Although oneself uses this Technology realizes small-scale industrialized production, but its scale and yield all can not much meet the need in international soft magnetic materials market It asks, and this preparation method technical process is sufficiently complex, energy consumption and of high cost, operating environment and its severe, it is impossible to meet ring Guaranteed request.
High silicon steel is " the steel art work ", and technology of preparing is all always and everywhere state-of-the-art steel and iron manufacturing technology, and It is the hot spot of development and exploitation.For 6.5%Si high silicon steel, excellent magnetic performance and wide application prospect are even more to inhale Draw scientific worker and carry out substantial amounts of research-and-development activity.The development of preparation process and ripe and can be cost-effectively Production is that 6.5%Si high silicon steel move towards to be commercialized widely applied key, also the always emphasis of research work.Once grope Go out simple, economic, effective, ripe preparation process, will just generate huge economic benefit and social benefit.
The content of the invention
The method for preparing high silicon steel band is sintered the object of the present invention is to provide a kind of powder rolling and High temperature diffusion, for The problem of Fe-Si alloy thin band materials of 4.5~6.7%Si contents are difficult to shape, using water-atomized iron powder and Si contents as 50~ 70% HIGH-PURITY SILICON iron powder is raw material, is formed after adding binder with compressibility powder mixture, then using powder rolling side Method prepares certain thickness slab, porous, heterogeneous blank is formed after degreasing, sintering, by multi-pass cold rolling-sintering After obtain thin plate, finally using High temperature diffusion be sintered obtain the high silicon steel band of homogeneous.
The present invention is achieved by the following technical solutions：Use subsphaeroidal water-atomized iron powder and fine Si contents for 50~70% HIGH-PURITY SILICON iron powder is raw material, forms Fe-4.5~6.7%Si mixed powders.By suitable bonding agent, disperse HIGH-PURITY SILICON iron powder is adhered to water-atomized iron powder surface by agent in mixed process.Since water atomization Fe powder is with high-compressibility Big particle, occupies larger volume ratio in mixed powder, and larger volume ratio is occupied in mixed powder, adds fine Si and contains Its deformability will not be significantly reduced after measuring the HIGH-PURITY SILICON iron powder for 50~70%, can porous plate be formed by powder rolling Base.Powder rolling slab is subjected to vacuum or protection of reducing atmosphere sintering in 1055~1155 DEG C of temperature ranges, makes Fe powder particles Realize not exclusively connection, and Si and Fe realizations are partially-alloyed, form the height of incomplete alloying that is porous, having compressibility Silicon steel blank.Subsequently through multiple cold rolling, not exclusively sintering, the density rise of slab, plate thickness are reduced, the alloying level of Si Also it is continuously improved.Finally vacuum or protection of reducing atmosphere sintering in 1265~1325 DEG C of temperature ranges, in the help of thermal diffusion The lower homogeneous alloy for realizing high silicon steel obtains 0.1~0.5mm thickness containing 4.5~6.7%Si, 7.35~7.50g/cm of density3 High silicon steel band.
The method of the present invention specifically comprises the following steps：
(1) raw material powder prepares
Using -100 mesh water-atomized iron powders, Fe >=99.0% in water-atomized iron powder, remaining for Si, Mn, P, S and other can not The impurity avoided uses Si contents as 50~70% HIGH-PURITY SILICON iron powder, grain size≤6 μm, this ferrosilicon powder except contain 50~ Beyond 70%Si, major impurity is~0.24%Al ,~0.07%Ca and~0.02%C, remaining is Fe.
Water atomization Fe powder is a kind of widely used Industrial iron powder, has subsphaeroidal pattern, impurity content is less than reduction Fe Powder has higher compressibility and mobility, is conducive to the Uniform Flow of powder rolling process course powder.Water atomization Fe powder In low impurity content it is favourable to the soft magnetic characteristic of high silicon steel.
Fe-50~70%Si high purity ferrosilicons in process of setting there are two eutectic reactions, when rich Si one sides are at 1207 DEG C Form the β-FeSi with tP3 structures2With Si phase eutectic structures, form when rich Fe one sides are at 1212 DEG C and tied with tP3 β-the FeSi of structure2With the FeSi eutectic structures of cP8 structures；At 982 DEG C and 937 DEG C, also there are β-FeSi2Decomposition and oC48- FeSi2Two solid-state phase changes processes of formation of phase.Therefore it is easy in process of setting of the Fe-50~70%Si after refining crisp Change, form subtle Fe-Si or Si heterogeneous structures, it is easy to refine by Mechanical Crushing technique.Fe-50~70%Si is high-purity Ferrosilicon is crushed to≤6 μm of ferrosilicon powder, Si phases, FeSi in actual tissue2, FeSi phases it is more tiny, be conducive to subsequent high temperature The thermal diffusion homogenization of Si elements, forms homogeneous Fe-6.5%Si single-phase alloys during sintering.Meanwhile exist in high purity ferrosilicon powder 30~50%Fe can effectively reduce the degree of oxidation of Si, be conducive to improve the product quality of high silicon steel.
By Fe-50~70%Si high purity ferrosilicons Mechanical Crushing to grain size≤6 μm, be conducive to it and be adhered to the table of reduction Fe powder Face is filled in the hole of reduction Fe powder, tiny Si, FeSi2, FeSi phases Dispersed precipitate in blank, play structure refinement Strengthening and Toughening effect, be conducive to improve subsequent blank toughness, cracking do not easily caused in densification process is rolled.But Fe-50 Still containing a small amount of Si phases in~70%Si high purity ferrosilicons, Si is easily absorbing oxygen, and SiO is formed in exposed Si phase surfaces2Film, Therefore in the preparation, storage and transfer process of Fe-50~70%Si HIGH-PURITY SILICON iron powders and in follow-up batch mixing, the operation of rolling Inert gas shielding should be used, used instrument must also take dehydration, drying process in advance.
On the premise of oxygen content is controlled, influence of the impurity such as Al, Ca, Mn to alloy magnetic property is little, introduces in the process The possibility of other alloying elements is also little.
(2) powder mixes
According to the ratio of Fe-4.5~6.7%Si, water atomization Fe powder and Fe-50~70%Si HIGH-PURITY SILICON iron powders are weighed； It is mixed under inert protective atmosphere using low energy mixer, mixing velocity and time, should try one's best mitigation depending on mixing uniformity Processing hardening occurs in mixed process for Fe powder.
(3) powder rolling
Using two roller horizontal mills and feeding trough is tilted, is conducted oneself with dignity using powder, the frictional force feeding between roll and powder, Thickness is rolled out as 1.0~2.3mm, width is 100~240mm, and density is 6.1~6.8g/cm3Powder strip plate.
Go out the difference in roller direction by band, powder rolling can be divided into vertical, horizontal and tilt 3 kinds of forms, and feeding manner has Dead weight feeding, forced feed, pre-glued feeding etc..The width of blank is related with the width of feeding trough, and the length of blank regards production Depending on condition is permitted and is actually needed.
(4) degreasing, sintering
Powder strip plate is placed on surface to be coated in the support plate of MgO micro mists, is placed into vacuum degreasing, sintering furnace, 2h~4h is kept the temperature respectively using the heating rate of 2~5 DEG C/min, and in 200 DEG C, 400 DEG C, then will heat up to 1055~1155 DEG C 2~4h of heat preservation sintering, sintered blank density are 6.2~6.9g/cm3。
Uniform equiaxed grain structure is formed after sintering.Matrix grain is about 70~100 μm, and crystal boundary has hole about~10 μm Gap, subsequent rolling and sintering can be closed.Only a small amount of the second phase about~2 μm is remained in matrix, with matrix Tissue has good interface cohesion, i.e., the face divided does not occur.These obvious second phases are certain richness Si phases, these richness Si phases Presence, reduce the Si contents of matrix so that matrix has high plastic deformation ability；Meanwhile with matrix Highly organized interface cohesion and Dispersed precipitate are conducive to subsequently homogenization diffusion.
Sintering temperature is too low, the connection being unfavorable between Fe powder particles and Si atoms permeatings, and sintering temperature is excessively high then can be by In the diffusion into the surface of Fe, Si element, there is coarse hole, be subsequently difficult to press, rolling densification is difficult to realize.
During sintering can powder rolling blank can be placed with multilayer, but must separate between layers, to avoid plate during sintering Base contraction causes to crack.Heating rate should not be too fast during sintering, and multistage heat preservation can be set in temperature-rise period, to realize degassing, take off The effect of fat.Reproducibility or inert gas shielding degreasing, sintering can also be taken.W, Mo, heat resisting steel etc. may be employed during sintering As support plate (or burn boat), the ceramic wafers such as corundum, zirconium oxide can also be used, but metallic plate thermal conductivity it is good and beneficial to uniformly Sintering shrinkage.
(5) cold rolling-sintering densification
By above-mentioned sintering slab rolled thickness reduction, single pass rolling reduction≤8% reaches 30 through multi- pass rolling to total reduction After~45%, in sintering furnace, 0.5~2h is re-sintered in 1055~1155 DEG C, after multiple cold rolling-sintering, the thickness of plate reaches To 0.1~0.5mm, density reaches 7.35~7.50g/cm3。
Since powder batch is porous organization, and there are deformable Fe phases, slab can bear cold-rolling deformation.Palette There is also more high Si phases in base, performance is more crisp, therefore not above 8%, accumulation total reduction reaches amount under every time rolling 8~20 passages are taken around to 30~45%.
Due to there are a large amount of holes and hard crisp phase, taking when reburning for 1055 DEG C~1155 DEG C, in secondary vacuum-sintering or also It is sintered in originality protective atmosphere, to realize the reparation of the closing of pores and crackle and the homogenization diffusion of a degree of Si elements. Heating rate can be very fast at this time, in 5~10 DEG C/min, can continuous warming, soaking time determines depending on thickness of slab, during thickness of slab >=1mm, Soaking time is 1~2h；Thickness of slab is reduced to 0.5~1h in 0.1~1mm, soaking time.Sintered accumulation drafts reaches every time , it is necessary to be sintered 1 time again after to 30~45%, 0.1~0.5mm is rolled down to from the powder base of 1.0~2.3mm, is taken around again Sintering 4~8 times.In addition, in order to which the density of plate is made to reach 7.2g/cm3More than (about the 95% of theoretical density), it is also desirable to 4 Secondary above re-sinters.
By the grain structure that 2 cold rollings-sintered metallographic structure matrix is about 100 μm, there is a small amount of tiny hole Gap.Matrix grain is there are two types of different contrasts, this is because Si contents are different and cause to corrode difference, low Si is brilliant in this kind tissue Grain is conducive to machining deformation so that the thin plate of 0.1~0.5mm of manufacture is possibly realized.
(6) high temperature sintering is homogenized
Vacuum or restitutive protection 1~4h of atmosphere sintering in 1265~1325 DEG C of temperature ranges, in the effect of thermal diffusion Under, it realizes the homogenization of Si, forms single-phase alloy, obtain the high silicon steel of homogeneous, the thickness of plate is almost unchanged after densification sintering, For 0.1~0.5mm, density reaches 7.35~7.50g/cm3。
With high-energy ball milling or rush rotation method obtain grain size≤6 μm HIGH-PURITY SILICON iron powder.
Low energy mixer described in step (2) is conical mixer, V-arrangement batch mixer or drum mixer.
Step (2) adds that cellulose, paraffin micro mist or zinc stearate are water-insoluble as binder, and binder adds when mixing Dosage total amount is no more than the 0.8% of mixed-powder gross mass, while adds grease and absolute ethyl alcohol does passivator, plays passivation Si Powder, bonding Fe-Si powder, the effect for enhancing powder flowbility and compact strength, the additive amount total amount of passivator are no more than mixed powder The 2% of last gross mass.
Step (5) is sintered, by 5 when re-sintering for 1055 DEG C~1155 DEG C under vacuum-sintering or restitutive protection's atmosphere ~10 DEG C/min continuous warmings, during thickness of slab >=1mm, soaking time is 1~2h；Thickness of slab is reduced in 0.1~1mm, soaking time 0.5~1h after sintered accumulation drafts reaches 30~45% every time, is sintered 1 time, is rolled from the powder base of 1.0~2.3mm again It makes to 0.1~0.5mm, it is necessary to be sintered 4~8 times again.
Support plate described in step (4) burns boat using W, Mo, corundum or zirconia ceramics.
Placement sintering plate can be overlapped during high temperature sintering, but interlayer must be laid with MgO powder, and W, Mo can be used and ceramics are burnt Boat.But plate must tile placement, and tablet weight can be placed on plate, prevents from deforming in sintering process.
In addition to Si contents, content of elements such as grain size, crystal grain orientation, C etc. also has the magnetic behavior of high silicon steel Large effect can subsequently be annealed by wet hydrogen, the technological means such as normalizing treatment are controlled by.
Essence of the invention is by being with the addition of granularity≤6 in the water atomization Fe powder of the big volumetric portion with good plasticity μm Fe-50~70%Si high-purity powders, form Fe-4.5~6.7%Si alloy mixtures, powder rolling is laggard into slab Row incomplete alloying sintering makes Fe powder particles realize not exclusively sintering, and Si and Fe realizes partially-alloyed, formation is porous, The high silicon steel blank of incomplete alloying with compressibility.Subsequently through multi-pass cold rolling and sintering, even tissue is improved Property and compactness, then by high-temperature diffusion process, the homogenization of Si is realized, so as to obtain the single-phase high silicon strip of complete alloying Material.This method realizes Technics Process Automation, continuous production by technique and equipment Design, it can be mass-produced 0.1~ 0.5mm is thick, 7.35~7.50g/cm of density3High silicon steel band.
Description of the drawings
Fig. 1 is the sintered metallograph of powder rolling base of the embodiment of the present invention 2；
Fig. 2 is that the plate of the embodiment of the present invention 3 passes through 2 cold rollings-sintered metallograph；
Fig. 3 is XRD diffraction curves after the powder rolling base high temperature sintering of the embodiment of the present invention 4.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Embodiment 1
By the water atomization Fe powder of -100 mesh and the Fe-70%Si high-purity powders of granularity≤6 μm according to 90.43:9.57 ratio Example mixing forms the mixed-powder of Fe-6.7%Si.The paraffin micro mist of raw material total amount 0.6%, 0.1% machine are added during mixing Oil.Absolute ethyl alcohol is added according to 200ml/ tons of amount.Using V-arrangement batch mixer by above-mentioned powder mixing 4h.
Using two roller horizontal mills and feeding trough is tilted, is conducted oneself with dignity using powder, the frictional force feeding between roll and powder, The powder rolling slab of 2.3mm is rolled out, the width of slab is 100mm.The density of green compact is 6.1g/cm3。
Powder strip plate is placed on surface to be coated on the molybdenum plate of MgO micro mists, is placed into vacuum degreasing, sintering furnace.It adopts With the heating rate of 2 DEG C/min, and 4h is kept the temperature respectively in 200 DEG C, 400 DEG C.Then will heat up to 1055 DEG C of heat preservation sintering 4h.It burns It is 6.2g/cm to tie base density3。
By above-mentioned sintering slab rolled thickness reduction, single pass rolling reduction≤8% reaches 30 through multi- pass rolling to total reduction After~45%, then in vacuum sintering furnace, in 1055 DEG C of heat preservation sinterings.With 5 DEG C/min speed continuous warmings, soaking time regards plate Thickness determines, during thickness of slab >=1mm, soaking time 2h；Thickness of slab is in 0.1~1mm, soaking time 1h.Specific pressure-annealing schedule For：2.3mm → 1.6mm → 1.02mm → 0.71mm → 0.49mm, i.e., after 4 cold rollings and 3 sintering, the thickness of plate reaches 0.49mm, density reach 7.34g/cm3。
For above-mentioned cold rolling made-up belt in 1325 DEG C of vacuum-sintering 1h, it is about 0.50mm, density 7.35g/cm to obtain thickness3, Si Content is the 6.7% high silicon steel of single-phase homogeneous.
Embodiment 2
By the water atomization Fe powder of -100 mesh and the Fe-50%Si high-purity powders of granularity≤10 μm according to 91:9 ratio is mixed It closes, forms the mixed-powder of Fe-4.5%Si.The zinc stearate of raw material total amount 0.7%, 0.1% machine oil are added during mixing.Nothing Water-ethanol is added according to 400ml/ tons of amount.Using drum mixer by above-mentioned powder mixing 6h.
Using two roller horizontal mills and feeding trough is tilted, is conducted oneself with dignity using powder, the frictional force feeding between roll and powder, The powder rolling slab of 1.0mm is rolled out, the width of slab is 240mm.The density of green compact is 6.8g/cm3。
Powder strip plate is placed on surface to be coated on the molybdenum plate of MgO micro mists, is placed into vacuum degreasing, sintering furnace.It adopts With the heating rate of 5 DEG C/min, and 2h is kept the temperature respectively in 200 DEG C, 400 DEG C.Then will heat up to 1155 DEG C of heat preservation sintering 2h.It burns It is 6.9g/cm to tie base density3。
Uniform equiaxed grain structure is formed after sintering, sees Fig. 1.Matrix grain is about 70~100 μm, and crystal boundary exists about~10 μm hole, it is subsequent rolling and sintering can be closed.Only a small amount of the second phase about~2 μm is remained in matrix, There is good interface cohesion with matrix, i.e., the face divided do not occur.These obvious second phases are certain richness Si phases, these The presence of rich Si phases reduces the Si contents of matrix so that matrix has high plastic deformation ability；Meanwhile Interface cohesion good with matrix and Dispersed precipitate are conducive to subsequently homogenization diffusion.
By above-mentioned sintering slab rolled thickness reduction, single pass rolling reduction≤8% reaches 30 through multi- pass rolling to total reduction After~45%, then in vacuum sintering furnace, in 1155 DEG C of heat preservation sinterings.With 10 DEG C/min speed continuous warmings, soaking time is 1h.Specifically pressure-annealing schedule is：1.0mm → 0.65mm → 0.39mm → 0.25mm → 0.17mm → 0.13mm → 0.10mm, I.e. after 6 cold rollings and 5 sintering, the thickness of plate reaches 0.10mm, and density reaches 7.49g/cm3。
For above-mentioned cold rolling made-up belt in 1265 DEG C of vacuum-sintering 5h, it is about 0.10mm, density 7.50g/cm to obtain thickness3, Si Content is the 4.5% high silicon steel of single-phase homogeneous.
Embodiment 3
By the water atomization Fe powder of -100 mesh and the Fe-60%Si high-purity powders of granularity≤6 μm according to 89.17:10.83 ratio Example mixing forms the mixed-powder of Fe-6.5%Si.The paraffin micro mist of raw material total amount 0.4%, 0.2% methyl are added during mixing Cellulose, 0.1% machine oil.Absolute ethyl alcohol is added according to 400ml/ tons of amount.Above-mentioned powder is mixed using drum mixer Close 6h.
Using two roller horizontal mills and feeding trough is tilted, is conducted oneself with dignity using powder, the frictional force feeding between roll and powder, The powder rolling slab of 1.6mm is rolled out, the width of slab is 150mm.The density of green compact is 6.15g/cm3。
Powder strip plate is placed on surface to be coated on the corundum plate of MgO micro mists, the degreasing of hydrogen tube furnace is placed into, burns Knot.Using the heating rate of 3 DEG C/min, and 2h, 400 DEG C of heat preservation 3h are kept the temperature at 200 DEG C.Then it will heat up to 1120 DEG C of heat preservations and burn Tie 3h.Sintered blank density is 6.20g/cm3。
By above-mentioned sintering slab rolled thickness reduction, single pass rolling reduction≤8% reaches 30 through multi- pass rolling to total reduction After~45%, then in hydrogen tube furnace, in 1120 DEG C of heat preservation sintering 1h.With 6 DEG C/min speed continuous warmings.Specific pressure- Annealing schedule is：1.6mm → 1.08mm → 0.70mm → 0.45mm → 0.27mm, i.e., after 4 cold rollings and 3 sintering, plate Thickness reach 0.27mm, density reaches 7.37g/cm3。
See Fig. 2 by 2 cold rollings-sintered metallographic structure, matrix is about 100 μm of grain structure, is existed a small amount of thin Small hole.Matrix grain is there are two types of different contrasts, this is because Si contents are different and cause to corrode difference, in this kind tissue Low Si crystal grain is conducive to machining deformation so that the thin plate of 0.1~0.5mm of manufacture is possibly realized.
For above-mentioned cold rolling made-up belt in 1305 DEG C of vacuum-sintering 2h, it is about 0.27mm, density 7.38g/cm to obtain thickness3, Si Content is the 6.5% high silicon steel of single-phase homogeneous.
Embodiment 4
By the water atomization Fe powder of -100 mesh and the Fe-62%Si high-purity powders of granularity≤10 μm according to 90.64:9.36 ratio Example mixing forms the mixed-powder of Fe-5.8%Si.The paraffin micro mist of raw material total amount 0.6%, 0.2% machine are added during mixing Oil.Absolute ethyl alcohol is added according to 400ml/ tons of amount.Using drum mixer by above-mentioned powder mixing 3h.
Using two roller horizontal mills and feeding trough is tilted, is conducted oneself with dignity using powder, the frictional force feeding between roll and powder, The powder rolling slab of 1.96mm is rolled out, the width of slab is 200mm.The density of green compact is 6.3g/cm3。
Powder strip plate is placed on surface to be coated on the corundum plate of MgO micro mists, the degreasing of hydrogen tube furnace is placed into, burns Knot.Using the heating rate of 4 DEG C/min, and 3h, 400 DEG C of heat preservation 2h are kept the temperature at 200 DEG C.Then it will heat up to 1130 DEG C of heat preservations and burn Tie 2h.Sintered blank density is 6.36g/cm3。
By above-mentioned sintering slab rolled thickness reduction, single pass rolling reduction≤8% reaches 30 through multi- pass rolling to total reduction After~45%, then in hydrogen tube furnace, in 1130 DEG C of heat preservation sintering 0.5h.With 8 DEG C/min speed continuous warmings.Specific pressure Under-annealing schedule is：1.96mm → 1.3mm → 0.96mm → 0.72mm → 0.46mm → 0.32mm → 0.21mm is that is, cold through 7 times It rolls with after 6 sintering, the thickness of plate reaches 0.21mm, and density reaches 7.41g/cm3。
For above-mentioned cold rolling made-up belt in 1300 DEG C of vacuum-sintering 2h, it is about 0.22mm, density 7.42g/cm to obtain thickness3, Si Content is 5.8%, and the XRD analysis figure of final plate is shown in Fig. 3, is the high silicon steel of single-phase homogeneous.

Claims (7)

1. a kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering, it is characterised in that comprise the following steps：
(1) raw material powder prepares
Using -100 mesh water-atomized iron powders, Fe >=99.0% in water-atomized iron powder, remaining is Si, Mn, P, S and other are inevitable Impurity, use Si contents as 50~70% HIGH-PURITY SILICON iron powder, grain size≤6 μm, major impurity is~0.24%Al ,~ 0.07%Ca and~0.02%C, remaining is Fe；
(2) powder mixes
According to the ratio of Fe-4.5~6.7%Si, water atomization Fe powder and Fe-50~70%Si HIGH-PURITY SILICON iron powders are weighed；In inertia It is mixed under protective atmosphere using low energy mixer；
(3) powder rolling
Using two roller horizontal mills and feeding trough is tilted, is conducted oneself with dignity using powder, the frictional force feeding between roll and powder, rolled Go out thickness for 1.0~2.3mm, width is 100~240mm, and density is 6.1~6.8g/cm3Powder strip plate；
(4) degreasing, sintering
Powder strip plate is placed on surface to be coated in the support plate of MgO micro mists, is placed into vacuum degreasing, sintering furnace, using 2 The heating rate of~5 DEG C/min, and 2h~4h is kept the temperature respectively in 200 DEG C, 400 DEG C, it then will heat up to 1055~1155 DEG C of guarantors Temperature 2~4h of sintering, sintered blank density are 6.2~6.9g/cm3；
(5) cold rolling-sintering densification
By above-mentioned sintering slab rolled thickness reduction, single pass rolling reduction≤8%, reach 30 through multi- pass rolling to total reduction~ After 45%, in sintering furnace, 0.5~2h is re-sintered in 1055~1155 DEG C, after multiple cold rolling-sintering, the thickness of plate reaches 0.1~0.5mm, density reach 7.34~7.49g/cm3；
(6) high temperature sintering is homogenized
Vacuum or restitutive protection 1~4h of atmosphere sintering in 1265~1325 DEG C of temperature ranges, it is real under the action of thermal diffusion The homogenization of existing Si forms single-phase alloy, obtains the high silicon steel of homogeneous, and the thickness of plate is 0.1~0.5mm after densification sintering, Density reaches 7.35~7.50g/cm3。
2. the method that powder rolling as described in claim 1 prepares high silicon steel band with High temperature diffusion sintering, it is characterised in that： With high-energy ball milling or rush rotation method obtain grain size≤6 μm HIGH-PURITY SILICON iron powder.
3. the method that powder rolling as described in claim 1 prepares high silicon steel band with High temperature diffusion sintering, it is characterised in that： Low energy mixer described in step (2) is conical mixer, V-arrangement batch mixer or drum mixer.
4. the method that powder rolling as described in claim 1 prepares high silicon steel band with High temperature diffusion sintering, it is characterised in that： It is water-insoluble as binder, the additive amount total amount of binder that step (2) adds cellulose, paraffin micro mist or zinc stearate when mixing It no more than the 0.8% of mixed-powder gross mass, while adds grease and absolute ethyl alcohol does passivator, plays passivation Si powder, bonding Fe- The effect of Si powder, enhancing powder flowbility and compact strength, the additive amount total amount of passivator are no more than mixed-powder gross mass 2%.
5. the method that powder rolling as described in claim 1 prepares high silicon steel band with High temperature diffusion sintering, it is characterised in that： Step (5) is sintered, by 5~10 DEG C/min when re-sintering for 1055~1155 DEG C under vacuum-sintering or restitutive protection's atmosphere Continuous warming, during thickness of slab >=1mm, soaking time is 1~2h；Thickness of slab is in 0.1~1mm, and soaking time is reduced to 0.5~1h, often After secondary sintered accumulation drafts reaches 30~45%, it is sintered 1 time again, 0.1 is rolled down to from the powder base of 1.0~2.3mm~ 0.5mm, it is necessary to be sintered 4~8 times again.
6. the method that powder rolling as described in claim 1 prepares high silicon steel band with High temperature diffusion sintering, it is characterised in that： Overlapping places sintering plate during high temperature sintering, and interlayer is laid with MgO powder.
7. the method that powder rolling as described in claim 1 prepares high silicon steel band with High temperature diffusion sintering, it is characterised in that： Support plate described in step (4) burns boat using W, Mo, corundum or zirconia ceramics.
CN201711369169.4A 2017-12-18 2017-12-18 A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering Withdrawn CN108097963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711369169.4A CN108097963A (en) 2017-12-18 2017-12-18 A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711369169.4A CN108097963A (en) 2017-12-18 2017-12-18 A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering

Publications (1)

Publication Number Publication Date
CN108097963A true CN108097963A (en) 2018-06-01

Family

ID=62211076

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711369169.4A Withdrawn CN108097963A (en) 2017-12-18 2017-12-18 A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering

Country Status (1)

Country Link
CN (1) CN108097963A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1273611A (en) * 1998-05-29 2000-11-15 住友特殊金属株式会社 Method for producing high silicon steel and silicon steel
CN1528921A (en) * 2003-09-25 2004-09-15 武汉理工大学 High-silica silicon-steel sheet heat treatment and multiple cold-rolling method
CN103014613A (en) * 2012-12-31 2013-04-03 上海大学 Method for continuous preparation of high-silicon sheet iron by thermal diffusion and high-silicon sheet iron continuous rolling device
CN104962798A (en) * 2015-07-24 2015-10-07 北京科技大学 Method for preparing high-silicon steel by powder sleeve forming
CN206692709U (en) * 2017-05-02 2017-12-01 贵州理工学院 A kind of Powder Diffusion continuously prepares the device of high-silicon steel thin strip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1273611A (en) * 1998-05-29 2000-11-15 住友特殊金属株式会社 Method for producing high silicon steel and silicon steel
CN1528921A (en) * 2003-09-25 2004-09-15 武汉理工大学 High-silica silicon-steel sheet heat treatment and multiple cold-rolling method
CN103014613A (en) * 2012-12-31 2013-04-03 上海大学 Method for continuous preparation of high-silicon sheet iron by thermal diffusion and high-silicon sheet iron continuous rolling device
CN104962798A (en) * 2015-07-24 2015-10-07 北京科技大学 Method for preparing high-silicon steel by powder sleeve forming
CN206692709U (en) * 2017-05-02 2017-12-01 贵州理工学院 A kind of Powder Diffusion continuously prepares the device of high-silicon steel thin strip

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
员文杰，沈强，张联盟: "粉末轧制法制备Fe-6.5%Si硅钢片的研究", 《粉末冶金技术》 *
员文杰: "粉末轧制法制备高硅硅钢片的工艺及过程原理的研究", 《中国博士学位论文全文数据库工程科技Ⅰ辑》 *
周勇: "铁、硅复合粉末的轧制成型与后续热处理", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》 *
张翔: "粉末冶金法制备高硅硅钢片的轧制和热处理工艺研究", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 *

Similar Documents

Publication Publication Date Title
CN107900345A (en) A kind of Powder hot isostatic pressure manufacture method of high silicon steel thin belt material
CN108097961A (en) A kind of method that High temperature diffusion sintering prepares high silicon steel band with Powder hot isostatic pressure
CN107900355A (en) A kind of method that powder warm-rolling prepares high silicon steel thin belt material
CN108097965A (en) A kind of powder extruding method for making of high silicon steel thin belt material
CN108044100A (en) A kind of method that powder rolling prepares Fe-6.5%Si soft magnetic materials thin strips
CN108080641A (en) A kind of powder rolling preparation method of Fe-6.5%Si soft magnetic materials thin strip
CN107983962A (en) A kind of method that powder rolling prepares single-phase Fe-6.5%Si silicon steel
CN108097966A (en) A kind of method that High temperature diffusion sintering prepares high silicon steel band with powder warm-rolling
CN108097963A (en) A kind of method that powder rolling prepares high silicon steel band with High temperature diffusion sintering
CN107900356A (en) A kind of method that powder tape casting prepares high silicon steel band with High temperature diffusion sintering
CN108044106A (en) A kind of method that Powder hot isostatic pressure prepares high silicon steel band with High temperature diffusion sintering
CN108097968A (en) A kind of method that powder tape casting prepares single-phase Fe-6.5%Si silicon steel
CN107900346A (en) A kind of method that Powder hot isostatic pressure prepares high silicon steel thin belt material
CN108044107A (en) A kind of Powder hot isostatic pressure preparation method of Fe-6.5%Si soft magnetic materials thin strip
CN107900354A (en) A kind of method that powder extruding prepares high silicon steel thin belt material
CN108070777A (en) A kind of method that powder tape casting prepares Fe-6.5%Si soft magnetic materials thin strips
CN108044095A (en) A kind of method that diffusion-sintering prepares Fe-6.5%Si bands with powder rolling
CN108044101A (en) A kind of method that powder rolling prepares Fe-6.5%Si bands with diffusion-sintering
CN107900350A (en) A kind of method that powder rolling prepares high silicon steel thin belt material
CN108057884A (en) A kind of method that High temperature diffusion sintering prepares high silicon steel band with powder rolling
CN107999764A (en) A kind of method that diffusion-sintering prepares Fe-6.5%Si bands with powder warm-rolling
CN107900351A (en) A kind of powder rolling manufacture method of high silicon steel thin belt material
CN108044103A (en) A kind of method that powder warm-rolling prepares high silicon steel band with High temperature diffusion sintering
CN108097964A (en) A kind of powder warm-rolling manufacture method of high silicon steel thin belt material
CN107999765A (en) A kind of method that powder warm-rolling prepares Fe-6.5%Si soft magnetic materials thin strips

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information

Inventor after: Luo Fenghua

Inventor after: Du Shuai

Inventor after: Xue Lishan

Inventor after: Jia Jixiang

Inventor after: Li Yimin

Inventor before: Luo Fenghua

Inventor before: Wu Ning

Inventor before: Xue Lishan

Inventor before: Jia Jixiang

Inventor before: Li Yimin

CB03 Change of inventor or designer information
WW01 Invention patent application withdrawn after publication

Application publication date: 20180601

WW01 Invention patent application withdrawn after publication