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Magnetic Properties of FeSiBC Amorphous Alloy Powder Cores Using Mechanical-crushed Powder
JOURNALOFIRON ANDSTEELRESEARCH,INTERNATIONAL２ ０ １ ４,２ １( １ １):１ ０ ５ ５ Ｇ １ ０ ５ ８
Ma t i cPr ope r t i e so fFe S i BCAmo r sAl l o e r gne phou yPowd Co r e sUs i ng Me chan i c a l Ｇ c r u s he dPowd e r １２ Xi ang Ｇ i Ｇ chaoLU１ ２ , Cao Ｇwe iLU１ ２ , Guang Ｇmi nLI２ , De Ｇ r enLI１ ２ yue WANG , Zh ,
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( １．Ch i naI r onandS t e e lRe s e a r chI ns t i t u t e,Be i i ng１０００８１,Ch i na; ２．Advanc edTe chno l ogyand j Ma t e r i a l sCo ,Lt d ,Be i i ng１０００８１,Ch i na) j
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Ab s t r a c t:TheFeS i BCamo r rc o r e s we r ef ab r i c a t edus i ngpowde r so ft heFeS i BCamo r i bbons phouspowde phousr wh i chwe r eme chan i c a l l r ushedf o rasho r tt ime,andt her e l a t i onsh i twe enmagne t i cp r ope r t i e sandpowde rpa r Ｇ yc pbe t i c l es i z e swa se va l ua t ed．Thes a t u r a t i onmagne t i z a t i onBs o ft heamo r i l l oywa s１ ６２T,wh i ch phousFe８２S ２B １５C １a r ov i dedasupe r i o rdc Ｇb i a sp r ope r t o rt hepowde rc o r e s．Me anwh i l e,as t ab l epe rme ab i l i t oh i r e p yf yupt ghf quency r angeove r１０ MHzandt hel owc o r el o s so f４００kW/m３ a tf＝５０kHzandBm ＝０ １T we r eob t a i ned．The s eexc e l Ｇ l en th i Ｇ f r e t i cp r ope r t i e so ft heFeS i BCamorphouspowde rcor e scou l dbea t t r i bu t edt ot hee f f e c t i ve gh quencymagne e l e c t r i c a li nsu l a t i onbe twe ent heFeS i BCamo r r smadebyme chan i c a lc r ush i ng． phouspowde Ke r d s:amo r rc o r e;me chan i c a lc r ush i ng;dc Ｇb i a sp r ope r t i r e r ope r t phouspowde y;h ghf quencyp y ywo
Fe Ｇb a s e damo r sa l l o i bbon sh a v eb e e nw i d e l phou yr y us eda sco r ema t e r i a l sbe c aus eo ft he i rexc e l l en ts o f t magne t i cp r ope r t i e s,sucha sl owc oe r c i v i t y H c and [ ] h i a t ur a t i on magne t i z a t i on Bs １－８ ．Bu tne i t he r ghs c omme r c i a lma s s Ｇ r oduc t i on me t hodso famo r p phous r sno rp r a c t i c a lamo r rc o r e shave powde phouspowde be endeve l oped．Re c en t l e su l t sont heamo r y,r phous r co r e st ha ti nvo l ve a spe c i a la t omi z a t i on powde o c e s s,me chan i c a la l l oy i ngo rar i bbon pu l ve r i z a Ｇ pr [ ] t i onme t hod９－１３ havebe enr epo r t ed． I nadd i t i ont o t hepowde rf ab r i c a t i on p r o c e s s wi t hanamo r phous s t ruc t ur e,i no r de rt ode a lwi t ht her e c en tp r og r e s s o fmi n i a t ur i z a t i onandh i rou t tcu r r en to fpowＧ ghe pu e rsupp l i e s,Fe Ｇ ba s edamo r rc o r e swi t h phouspowde h i r ee s s en t i a l． I nt h i ss t udy,h i S i BC ghBsa ghBs Fe amo r spowd e r sh a v eb e e nf ab r i c a t edbyus i ngan phou imp r ovedme chan i c a lc rush i ng me t hod．Th ema e t i c gn r op e r t i e so ft h eFe S i BCamo r spowde rc o r e shave p phou a l s obe ens t ud i ed．
１ Exp e r imen t a lDe t a i l s
Theamo r i２B１５ C１ a l l oy wa sp r o Ｇ phous Fe８２ S duc eda sr i bbonf o rm o fabou t３０ mmi n wi d t hand ２５－３０μ mi nt h i ckne s sbyas i ng l er o l l e rme l t Ｇ sp i n Ｇ n i ng me t hodi na i r．Thea l l oyc ompo s i t i onswe r eo f
t henomi na la t omi cpe r c en t age．FeS i BCamo r phous r s we r ep r epa r ed by me chan i c a l l rush i ng powde yc Fe８２S i２B１５ C１ amo r i bbons．Af t e rwa rds,t he phousr me chan i c a l Ｇ c rushed powde r s we r e pu tt hr ough a s i evei nf r a c t i onr ang i ngf r om ２０t o１２５ μm．The FeS i BCamo r r spa s s i va t edbyphospho r Ｇ phouspowde i ca c i dwe r eun i f o rml m i x e dw i t h２ m a s s ％ o f r e s Ｇ y , i n ２ ma s s％ o fi no r i cb i nde r sand１ ma s s％ o f gan z i ncs t e a r a t e．Themi x t ur ewa sd r i edwi t ht hehe l f po a c e t onea saco Ｇ so l ven t．Byco l dp r e s s i nga t２ GPa, andt henbe i nganne a l eda t６４３Kf o r３０mi ni na i rt o r educ et hep r e s s Ｇ i nduc edi n t e rna ls t r e s s,t heFeS i BC amo r rco r e swe r ef abr i c a t ed．Theco r e phouspowde ( ) s i z ewa sϕ２２ ９ mm ou t e rd i ame t e r ×ϕ１４ １ mm ( i nne rd i ame t e r)×７ ６ mm ( he i t)． gh Thes t ruc t ur eo ft heFeS i BCamo r i bbons phousr ( ) wa sexami nedbyXＧ r ayd i f f r a c t i on XRD wi t hCu Ｇ Kα,and t he t he rma l behav i o r wa st e s t ed by a Ne t z s chDSC４０４Ca tacons t an the a t i ngr a t eo f１０ / K mi n．DCBＧH l oopo ft heFeS i BCamo r i b Ｇ phousr bonswa sme a sur edbyahys t e r e s i sl oopt r a c e rwi t ha max imumapp l i edmagne t i cf i e l do f２８００ A/m．The mo r h o l o o ft h ea m o r h o u s o w r swi t hd i f f e r Ｇ p gy p p de en ts i z e swa sexami nedbys c ann i nge l e c t i on mi c r os Ｇ copy (SEM )．I n i t i a l pe rme ab i l i t sc a l cu l a t ed y wa
Founda t i onI t em: I t em Spons o r edbyNa t i ona lNa t ur a lSc i enc eFounda t i ono fCh i na ( ５１０７１０５０) B i o r aphy: Xi ang Ｇ c t o r,Eng i ne e r; E Ｇma i l: wangx i angyue １９８６＠１６３ c om; Re c e i v e dDa t e:J anua r yue WANG,Do y２８,２０１３ g
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J ou r na lo fI r onandS t e e lRe s e a r ch,I n t e r na t i ona l Vo l ２１
f r omco r ei nduc t anc eme a su r edbyanimpedanc ean Ｇ ( ) , a l z e r A i l e n t４ ２ ９ ４ A t h eD Cb i a sf i e l d e r f o r m Ｇ y g p anc e wa s me a su r ed by an Ag i l en t４９８０A andt he magne t i cco r el o s s wa s me a su r ed by anIWATSU SYＧ ８２３２BＧH ana l e r． yz
２ Re s u l t sandDi s c u s s i on
F i １showst heXＧ r ayd i f f r a c t i onpa t t e rnsr e Ｇ g ve a l i nganamo r t ruc t u r ef o rt heFe８２S i２B１５C１ phouss a l l oyr i bbons．Thet i c a lDSC cu r veo ft he Fe８２Ｇ yp S i２B１５C１ amo r l l oyi sshowni nF i ２．The phousa g c r t a l l i z a t i on t empe r a t u r e Tx o ft he amo r ys phous Fe８２S i２B１５C１ a l l oyi sabou t７４０K． Fu r t he ri nve s t i Ｇ ga t i ono f magne t i cp r ope r t i e sshowst ha tt heamo r Ｇ i２B１５C１ a l l oyha sah i a t u r a t i on mag Ｇ phousFe８２S ghs ne t i z a t i ono f１ ６２T,a ss howni nF i ３．Th eh i g ghBs amo r sa l l oyi sexpe c t edt obema rked l i l ab l e phou yava f o rdowns i z i ngo fchok i ngc o i l so rt r ans f o rme r sop Ｇ e r a t i nga th i r equenc i r． ghf yandh ghpowe
F i １ XRDpa t t e rno ft h eFe S i BCamo rphou sr i bbon g
F i ２ DSCc u r v eo ft h eFe S i BCamo rphou s g
F i ３ DCB ＧH c u r v eo ft h eFe S i BCamo rphou sr i bbon g
F i ４s howst heSEM mi c r og r a so ft heme c han i Ｇ g ph c a l Ｇ c r u s he damo r spowd e r s wi t hd i f f e r e n tp a r t i c l e phou : , , s i z e s －５０μm ＋５０－７５μm and ＋７５－１２５μm． I t i ss hownt ha tt he me c han i c a l Ｇ c r u s he damo r spowＧ phou d e r spo s s e s smo r er egu l a randr ounde redgecompa r ed [ １４] wi t ht he ba l l Ｇmi l l ed amo r r s ．The phous powde me chan i c a l Ｇ c rushedpowde r swi t ht h i sk i ndo fshape a r ee a s i e rt o becoa t ed wi t hb i nde randi nsu l a t i on , ma t e r i a lc aus i ngh i l e c t r i c a li nsu l a t i on． ghe I nF i ５,t hef r equenc eo ft heco r e g ydependenc l os sf o rt heFeS i BCamo r h o u s o w d e rc o r e s w i t h p p d i f f e r en tpa r t i c l es i z e si sp r e s en t ed．Theco r el os so f t hepowde rc o r e si s４００kW/m３a tBm ＝０ １Tandf＝ ５０kHzf o rt hepa r t i c l es i z eo f５０－７５μm,wh i chi s t hel owe s tamongt he s et hr e ek i ndso fpa r t i c l es i z e s． Theco r el os so ft he powde rco r e sf o rt he pa r t i c l e s i z ebe l ow５０μmi sh i h e r ． I t c o u l db ee x l a i n e db g p y t hede f o rma t i on o ft he FeS i BC powde r s．The de Ｇ f o rma t i ono ft he FeS i BC powde r soc cur r edi nt he c rush i ngandr ound i ngp r oc e s s．Asar e su l to ft ha t, t her e s i dua ls t r e s sa r i s ed．Ther e s i dua ls t r e s si n Ｇ c r e a s edt hecoe r c i v i t ft heFeS i BC powde rco r e s． yo I nt heo r her e s i dua ls t r e s so fde f o rma t i on p r o Ｇ y,t c e s s i ng wou l dbei nc r e a s edl a r l t hde c r e a s i ng ge y wi [ ] t hepa r t i c l es i z e１５ ．Thel owco r el os so fc o r e swi t h l a r ep a r t i c l es i z eov e r５０μmi st hough tt obema i n l g y duet ol owhys t e r e s i sl os s,b e c au s et hel a r ep a r t i c l e s g
( a)７５－１２５μm; ( b)５０－７５μm; ( c)＜５０μm．
F i ４ Mo rpho l o i e so fFe S i BCamo rphou sme chan i c a l Ｇ c r u s h e dpowd e r swi t hd i f f e r en tpa r t i c l es i z e s g g
I s sue１１ Magne t i cPr ope r t i e so fFeS i BC Amo r l oyPowde rCo r e sUs i ng Me chan i c a l Ｇ c r ushedPowde r phousAl
F i ５ Fr equ enc ep end enc eo ft h ec o r el o s sf o r g yd t h eFe S i BCamo rphou spowd e rc o r e swi t h d i f f e r en tpa r t i c l es i z e s
showl owe rc oe r c i v i t i rpe rme ab i l i t yandh ghe y．The e r m e a b i l i t o ft h e o w d e rc o r e si sa l s os h o wni n p y p Tab l e１．Ther e l a t i vedens i t ft heamo r yo phouspowＧ de rco r e si sr educ ed wi t h de c r e a s i ng t he pa r t i c l e , sde Ｇ s i z e wh i chr e su l t si nt ha tt hepe rme ab i l i t yμai c r e a s edf r om５５t o３２． F i ６showst hef r equenc eo ft h e g y dependenc e rme ab i l i t o rt h eFe S i BC amo r s powd e rc o r e s p yf phou wi t hd i f f e r en tpa r t i c l es i z e s．Al lt he s epowde rc o r e s showt hes t ab l epe rme ab i l i t t ht hepe r c en to fpe r Ｇ ywi
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me ab i l i t r９０％ upt o１０ MHz． I tcou l dbea t Ｇ yove t r i bu t edt ot hee f f e c t i vee l e c t r i c a li nsu l a t i onbe twe en t heFeS i BCamo r r smadeby me chan i c a l phouspowde c rush i ng．I ti nd i c a t e st ha tt he FeS i BC amo r phous rco r e sp r epa r edbyt h i sr ou t ec an p r ov i dea powde t en t i a lapp l i c a t i oni nh i r equenc ange． po ghf yr Thedcb i a sf i e l ddependenc eo ft hepe r c en t age o fpe rme ab i l i t f o rt h eF e S i B C a m o r h o u s o w r y p p de co r e sa tf r equenc f１００kHzwi t hd i f f e r en tpa r t i c l e yo s i z e si sshowni nF i ７．Be c aus eo ft her e l a t i ve l g y h i a t ur a t i on magne t i z a t i on o f１ ６２ T o ft he gh s FeS i BCamo r l l oy,t hepowde rco r e sexh i b i t phousa t hesupe r i o rdcb i a sp r ope r t r c en t ageo fpe r Ｇ y．Thepe me ab i l i t fco r e smadef r om ７５－１２５μm pa r t i c l e s yo ha s ne a r l rme ab i l i t t ８００ A m－１ , y ７０％ pe ya
whe r e a st hepe r c en t ageo fp e rme ab i l i t fsma l lp a r t i Ｇ yo c l ewi t h －５０μmco r e sha s８２％ pe rme ab i l i t i s y．Th c anbea t t r i bu t edt ot hef a c tt ha tamo r r phouspowde co r e so fl a r r t i c l e sa r ee a s i l a t ur a t edbyl owe r gepa ys app l i edmagne t i cf i e l dst hant hos eo fsma l lpa r t i c l e s．
Tab l e１ Th ep e rme ab i l i t ft h eFe S i BCamo rphou s yo e rc o r e swi t hd i f f e r en tpa r t i c l es i z e sa t powd Bm ＝０ １Tandf＝５０kHz Pa r t i c l es i z e ＜５０μm ５０－７５μm
７５－１２５μm
Pr ope r t i e so fpowde rc o r e s
μa
Re l a t i vedens i t y
５４
８１ ７％
３２
５５
７２ ４％
８２ １％
F i ６ Fr equ enc ep end enc eo ft h ep e rme ab i l i t o r g yd yf t h eFe S i BCamo rphou spowd e rc o r e swi t h d i f f e r en tpa r t i c l es i z e s
F i ７ Dep end enc eo fp e rme ab i l i t eonb i a sf i e l da t g ychang １００kHzf o rt h eFe S i BCamo rphou spowd e r c o r e swi t hd i f f e r en tpa r t i c l es i z e s
３ Conc l u s i on Thes o f tma e t i cp r op e r t i e so ft heFeS i BCamo r Ｇ gn h o u s o w d e r c o r e s r e a r e d b m e c h a n i c a l Ｇ c r u s h e d p p pp y e r swe r ei nv e s t i a t e d．Howt hemagne t i cp r ope r Ｇ powd g t i e sa th i r equenc ft heco l d Ｇ r e s s edamo r ghf yo p phous rco r e schangedf o rva r i ouspa r t i c l es i z e sf r om powde ２０t o１２５μm wa sa l soexami ned．Thel a r r t i c l e s gepa showl owe rcoe r c i v i t i rpe rme ab i l i t yandh ghe y．The r e l a t i vedens i t ft heamo r rco r e si sr e Ｇ yo phouspowde duc ed wi t h de c r e a s i ng t he pa r t i c l es i z e．The mo r Ｇ l ogyo ft heamo r r madef r om me Ｇ pho phouspowde chan i c a l l rush i ngr i bbonswa se a s obepa s s i va Ｇ yc yt t edandi nsu l a t ed,wh i chimp r ovedt hecha r a c t e r i s t i c o ft heco r el os so f４００kW/m３ a tf＝５０kHz,B m ＝
１０５８
J ou r na lo fI r onandS t e e lRe s e a r ch,I n t e r na t i ona l Vo l ２１
０ １Tandh i Ｇ f r equenc t i cp r ope r t i e swi t h gh y magne t hes t ab l e pe rme ab i l i t u t o１ ０ MH z ． B e c a u s eo f y p t her e l a t i ve l i f１ ６２To ft heFeS i BCamo r Ｇ yh ghBso l l oy,t hepowde rc o r e sc ou l dbeapp l i edun Ｇ phousa de rh i rou t tcu r r en to fpowe rsupp l i e s． ghe pu Re f e r enc e s:
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７２１１ Ｇ ７２１３． [ ７] Y．Ogawa,M．Naoe,Y．Yo sh i z awa,J．Magn．Magn．Ma t e r． ３０４ ( ２００６)６７５ Ｇ ６７８． [ ８] A．Mak i no,H．Me n,T．Kubo t a,IEEE．T r a n s．Ma ４５ ( ２００９) gn． ４３０２ Ｇ ４３０５． [ ９] M．Yag i,I．Endo,I．Ot suka,H．Yamamo t o,J．Magn．Magn． Ma t e r． ２１５ Ｇ ２１６ ( ２０００)８４ Ｇ ８７． [ １０] S．Yo s h i d a,T．Mi z u s h ima,T．Ha t a n a i,A． I nou e,IEEE T r a n s． Ma ３６ ( ２０００)３４２４ Ｇ ３４２６． gn． [ １１] I．Ot s uk a,K．Wa d a,Y．Ma e t a,IEEE T r a n s．Ma ４４ ( ２００８) gn． ３８９１ Ｇ ３８９３． [ １２] S．Tang,H．Wang,Z．Wang,Me t a l l i cFunc t i ona lMa t e r i a l s １７ ( ２０１０)No ３,９ Ｇ １２． [ １３] X．Wang,C． Lu,F．Guo,J．Magn．Magn．Ma t e r． ３２４ ( ２０１２) ２７２７ Ｇ ２７３０． [ １４] J．So r t,D C． I l e,AP．Zh i l ev,Sc r i t a Ma t e r． ５０ ( ２００４) ya p
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JOURNALOFIRON ANDSTEELRESEARCH,INTERNATIONAL２ ０ １ ４,２ １( １ １):１ ０ ５ ５ Ｇ １ ０ ５ ８
Ma t i cPr ope r t i e so fFe S i BCAmo r sAl l o e r gne phou yPowd Co r e sUs i ng Me chan i c a l Ｇ c r u s he dPowd e r １２ Xi ang Ｇ i Ｇ chaoLU１ ２ , Cao Ｇwe iLU１ ２ , Guang Ｇmi nLI２ , De Ｇ r enLI１ ２ yue WANG , Zh ,
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( １．Ch i naI r onandS t e e lRe s e a r chI ns t i t u t e,Be i i ng１０００８１,Ch i na; ２．Advanc edTe chno l ogyand j Ma t e r i a l sCo ,Lt d ,Be i i ng１０００８１,Ch i na) j
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Ab s t r a c t:TheFeS i BCamo r rc o r e s we r ef ab r i c a t edus i ngpowde r so ft heFeS i BCamo r i bbons phouspowde phousr wh i chwe r eme chan i c a l l r ushedf o rasho r tt ime,andt her e l a t i onsh i twe enmagne t i cp r ope r t i e sandpowde rpa r Ｇ yc pbe t i c l es i z e swa se va l ua t ed．Thes a t u r a t i onmagne t i z a t i onBs o ft heamo r i l l oywa s１ ６２T,wh i ch phousFe８２S ２B １５C １a r ov i dedasupe r i o rdc Ｇb i a sp r ope r t o rt hepowde rc o r e s．Me anwh i l e,as t ab l epe rme ab i l i t oh i r e p yf yupt ghf quency r angeove r１０ MHzandt hel owc o r el o s so f４００kW/m３ a tf＝５０kHzandBm ＝０ １T we r eob t a i ned．The s eexc e l Ｇ l en th i Ｇ f r e t i cp r ope r t i e so ft heFeS i BCamorphouspowde rcor e scou l dbea t t r i bu t edt ot hee f f e c t i ve gh quencymagne e l e c t r i c a li nsu l a t i onbe twe ent heFeS i BCamo r r smadebyme chan i c a lc r ush i ng． phouspowde Ke r d s:amo r rc o r e;me chan i c a lc r ush i ng;dc Ｇb i a sp r ope r t i r e r ope r t phouspowde y;h ghf quencyp y ywo
Fe Ｇb a s e damo r sa l l o i bbon sh a v eb e e nw i d e l phou yr y us eda sco r ema t e r i a l sbe c aus eo ft he i rexc e l l en ts o f t magne t i cp r ope r t i e s,sucha sl owc oe r c i v i t y H c and [ ] h i a t ur a t i on magne t i z a t i on Bs １－８ ．Bu tne i t he r ghs c omme r c i a lma s s Ｇ r oduc t i on me t hodso famo r p phous r sno rp r a c t i c a lamo r rc o r e shave powde phouspowde be endeve l oped．Re c en t l e su l t sont heamo r y,r phous r co r e st ha ti nvo l ve a spe c i a la t omi z a t i on powde o c e s s,me chan i c a la l l oy i ngo rar i bbon pu l ve r i z a Ｇ pr [ ] t i onme t hod９－１３ havebe enr epo r t ed． I nadd i t i ont o t hepowde rf ab r i c a t i on p r o c e s s wi t hanamo r phous s t ruc t ur e,i no r de rt ode a lwi t ht her e c en tp r og r e s s o fmi n i a t ur i z a t i onandh i rou t tcu r r en to fpowＧ ghe pu e rsupp l i e s,Fe Ｇ ba s edamo r rc o r e swi t h phouspowde h i r ee s s en t i a l． I nt h i ss t udy,h i S i BC ghBsa ghBs Fe amo r spowd e r sh a v eb e e nf ab r i c a t edbyus i ngan phou imp r ovedme chan i c a lc rush i ng me t hod．Th ema e t i c gn r op e r t i e so ft h eFe S i BCamo r spowde rc o r e shave p phou a l s obe ens t ud i ed．
１ Exp e r imen t a lDe t a i l s
Theamo r i２B１５ C１ a l l oy wa sp r o Ｇ phous Fe８２ S duc eda sr i bbonf o rm o fabou t３０ mmi n wi d t hand ２５－３０μ mi nt h i ckne s sbyas i ng l er o l l e rme l t Ｇ sp i n Ｇ n i ng me t hodi na i r．Thea l l oyc ompo s i t i onswe r eo f
t henomi na la t omi cpe r c en t age．FeS i BCamo r phous r s we r ep r epa r ed by me chan i c a l l rush i ng powde yc Fe８２S i２B１５ C１ amo r i bbons．Af t e rwa rds,t he phousr me chan i c a l Ｇ c rushed powde r s we r e pu tt hr ough a s i evei nf r a c t i onr ang i ngf r om ２０t o１２５ μm．The FeS i BCamo r r spa s s i va t edbyphospho r Ｇ phouspowde i ca c i dwe r eun i f o rml m i x e dw i t h２ m a s s ％ o f r e s Ｇ y , i n ２ ma s s％ o fi no r i cb i nde r sand１ ma s s％ o f gan z i ncs t e a r a t e．Themi x t ur ewa sd r i edwi t ht hehe l f po a c e t onea saco Ｇ so l ven t．Byco l dp r e s s i nga t２ GPa, andt henbe i nganne a l eda t６４３Kf o r３０mi ni na i rt o r educ et hep r e s s Ｇ i nduc edi n t e rna ls t r e s s,t heFeS i BC amo r rco r e swe r ef abr i c a t ed．Theco r e phouspowde ( ) s i z ewa sϕ２２ ９ mm ou t e rd i ame t e r ×ϕ１４ １ mm ( i nne rd i ame t e r)×７ ６ mm ( he i t)． gh Thes t ruc t ur eo ft heFeS i BCamo r i bbons phousr ( ) wa sexami nedbyXＧ r ayd i f f r a c t i on XRD wi t hCu Ｇ Kα,and t he t he rma l behav i o r wa st e s t ed by a Ne t z s chDSC４０４Ca tacons t an the a t i ngr a t eo f１０ / K mi n．DCBＧH l oopo ft heFeS i BCamo r i b Ｇ phousr bonswa sme a sur edbyahys t e r e s i sl oopt r a c e rwi t ha max imumapp l i edmagne t i cf i e l do f２８００ A/m．The mo r h o l o o ft h ea m o r h o u s o w r swi t hd i f f e r Ｇ p gy p p de en ts i z e swa sexami nedbys c ann i nge l e c t i on mi c r os Ｇ copy (SEM )．I n i t i a l pe rme ab i l i t sc a l cu l a t ed y wa
Founda t i onI t em: I t em Spons o r edbyNa t i ona lNa t ur a lSc i enc eFounda t i ono fCh i na ( ５１０７１０５０) B i o r aphy: Xi ang Ｇ c t o r,Eng i ne e r; E Ｇma i l: wangx i angyue １９８６＠１６３ c om; Re c e i v e dDa t e:J anua r yue WANG,Do y２８,２０１３ g
１０５６
J ou r na lo fI r onandS t e e lRe s e a r ch,I n t e r na t i ona l Vo l ２１
f r omco r ei nduc t anc eme a su r edbyanimpedanc ean Ｇ ( ) , a l z e r A i l e n t４ ２ ９ ４ A t h eD Cb i a sf i e l d e r f o r m Ｇ y g p anc e wa s me a su r ed by an Ag i l en t４９８０A andt he magne t i cco r el o s s wa s me a su r ed by anIWATSU SYＧ ８２３２BＧH ana l e r． yz
２ Re s u l t sandDi s c u s s i on
F i １showst heXＧ r ayd i f f r a c t i onpa t t e rnsr e Ｇ g ve a l i nganamo r t ruc t u r ef o rt heFe８２S i２B１５C１ phouss a l l oyr i bbons．Thet i c a lDSC cu r veo ft he Fe８２Ｇ yp S i２B１５C１ amo r l l oyi sshowni nF i ２．The phousa g c r t a l l i z a t i on t empe r a t u r e Tx o ft he amo r ys phous Fe８２S i２B１５C１ a l l oyi sabou t７４０K． Fu r t he ri nve s t i Ｇ ga t i ono f magne t i cp r ope r t i e sshowst ha tt heamo r Ｇ i２B１５C１ a l l oyha sah i a t u r a t i on mag Ｇ phousFe８２S ghs ne t i z a t i ono f１ ６２T,a ss howni nF i ３．Th eh i g ghBs amo r sa l l oyi sexpe c t edt obema rked l i l ab l e phou yava f o rdowns i z i ngo fchok i ngc o i l so rt r ans f o rme r sop Ｇ e r a t i nga th i r equenc i r． ghf yandh ghpowe
F i １ XRDpa t t e rno ft h eFe S i BCamo rphou sr i bbon g
F i ２ DSCc u r v eo ft h eFe S i BCamo rphou s g
F i ３ DCB ＧH c u r v eo ft h eFe S i BCamo rphou sr i bbon g
F i ４s howst heSEM mi c r og r a so ft heme c han i Ｇ g ph c a l Ｇ c r u s he damo r spowd e r s wi t hd i f f e r e n tp a r t i c l e phou : , , s i z e s －５０μm ＋５０－７５μm and ＋７５－１２５μm． I t i ss hownt ha tt he me c han i c a l Ｇ c r u s he damo r spowＧ phou d e r spo s s e s smo r er egu l a randr ounde redgecompa r ed [ １４] wi t ht he ba l l Ｇmi l l ed amo r r s ．The phous powde me chan i c a l Ｇ c rushedpowde r swi t ht h i sk i ndo fshape a r ee a s i e rt o becoa t ed wi t hb i nde randi nsu l a t i on , ma t e r i a lc aus i ngh i l e c t r i c a li nsu l a t i on． ghe I nF i ５,t hef r equenc eo ft heco r e g ydependenc l os sf o rt heFeS i BCamo r h o u s o w d e rc o r e s w i t h p p d i f f e r en tpa r t i c l es i z e si sp r e s en t ed．Theco r el os so f t hepowde rc o r e si s４００kW/m３a tBm ＝０ １Tandf＝ ５０kHzf o rt hepa r t i c l es i z eo f５０－７５μm,wh i chi s t hel owe s tamongt he s et hr e ek i ndso fpa r t i c l es i z e s． Theco r el os so ft he powde rco r e sf o rt he pa r t i c l e s i z ebe l ow５０μmi sh i h e r ． I t c o u l db ee x l a i n e db g p y t hede f o rma t i on o ft he FeS i BC powde r s．The de Ｇ f o rma t i ono ft he FeS i BC powde r soc cur r edi nt he c rush i ngandr ound i ngp r oc e s s．Asar e su l to ft ha t, t her e s i dua ls t r e s sa r i s ed．Ther e s i dua ls t r e s si n Ｇ c r e a s edt hecoe r c i v i t ft heFeS i BC powde rco r e s． yo I nt heo r her e s i dua ls t r e s so fde f o rma t i on p r o Ｇ y,t c e s s i ng wou l dbei nc r e a s edl a r l t hde c r e a s i ng ge y wi [ ] t hepa r t i c l es i z e１５ ．Thel owco r el os so fc o r e swi t h l a r ep a r t i c l es i z eov e r５０μmi st hough tt obema i n l g y duet ol owhys t e r e s i sl os s,b e c au s et hel a r ep a r t i c l e s g
( a)７５－１２５μm; ( b)５０－７５μm; ( c)＜５０μm．
F i ４ Mo rpho l o i e so fFe S i BCamo rphou sme chan i c a l Ｇ c r u s h e dpowd e r swi t hd i f f e r en tpa r t i c l es i z e s g g
I s sue１１ Magne t i cPr ope r t i e so fFeS i BC Amo r l oyPowde rCo r e sUs i ng Me chan i c a l Ｇ c r ushedPowde r phousAl
F i ５ Fr equ enc ep end enc eo ft h ec o r el o s sf o r g yd t h eFe S i BCamo rphou spowd e rc o r e swi t h d i f f e r en tpa r t i c l es i z e s
showl owe rc oe r c i v i t i rpe rme ab i l i t yandh ghe y．The e r m e a b i l i t o ft h e o w d e rc o r e si sa l s os h o wni n p y p Tab l e１．Ther e l a t i vedens i t ft heamo r yo phouspowＧ de rco r e si sr educ ed wi t h de c r e a s i ng t he pa r t i c l e , sde Ｇ s i z e wh i chr e su l t si nt ha tt hepe rme ab i l i t yμai c r e a s edf r om５５t o３２． F i ６showst hef r equenc eo ft h e g y dependenc e rme ab i l i t o rt h eFe S i BC amo r s powd e rc o r e s p yf phou wi t hd i f f e r en tpa r t i c l es i z e s．Al lt he s epowde rc o r e s showt hes t ab l epe rme ab i l i t t ht hepe r c en to fpe r Ｇ ywi
１０５７
me ab i l i t r９０％ upt o１０ MHz． I tcou l dbea t Ｇ yove t r i bu t edt ot hee f f e c t i vee l e c t r i c a li nsu l a t i onbe twe en t heFeS i BCamo r r smadeby me chan i c a l phouspowde c rush i ng．I ti nd i c a t e st ha tt he FeS i BC amo r phous rco r e sp r epa r edbyt h i sr ou t ec an p r ov i dea powde t en t i a lapp l i c a t i oni nh i r equenc ange． po ghf yr Thedcb i a sf i e l ddependenc eo ft hepe r c en t age o fpe rme ab i l i t f o rt h eF e S i B C a m o r h o u s o w r y p p de co r e sa tf r equenc f１００kHzwi t hd i f f e r en tpa r t i c l e yo s i z e si sshowni nF i ７．Be c aus eo ft her e l a t i ve l g y h i a t ur a t i on magne t i z a t i on o f１ ６２ T o ft he gh s FeS i BCamo r l l oy,t hepowde rco r e sexh i b i t phousa t hesupe r i o rdcb i a sp r ope r t r c en t ageo fpe r Ｇ y．Thepe me ab i l i t fco r e smadef r om ７５－１２５μm pa r t i c l e s yo ha s ne a r l rme ab i l i t t ８００ A m－１ , y ７０％ pe ya
whe r e a st hepe r c en t ageo fp e rme ab i l i t fsma l lp a r t i Ｇ yo c l ewi t h －５０μmco r e sha s８２％ pe rme ab i l i t i s y．Th c anbea t t r i bu t edt ot hef a c tt ha tamo r r phouspowde co r e so fl a r r t i c l e sa r ee a s i l a t ur a t edbyl owe r gepa ys app l i edmagne t i cf i e l dst hant hos eo fsma l lpa r t i c l e s．
Tab l e１ Th ep e rme ab i l i t ft h eFe S i BCamo rphou s yo e rc o r e swi t hd i f f e r en tpa r t i c l es i z e sa t powd Bm ＝０ １Tandf＝５０kHz Pa r t i c l es i z e ＜５０μm ５０－７５μm
７５－１２５μm
Pr ope r t i e so fpowde rc o r e s
μa
Re l a t i vedens i t y
５４
８１ ７％
３２
５５
７２ ４％
８２ １％
F i ６ Fr equ enc ep end enc eo ft h ep e rme ab i l i t o r g yd yf t h eFe S i BCamo rphou spowd e rc o r e swi t h d i f f e r en tpa r t i c l es i z e s
F i ７ Dep end enc eo fp e rme ab i l i t eonb i a sf i e l da t g ychang １００kHzf o rt h eFe S i BCamo rphou spowd e r c o r e swi t hd i f f e r en tpa r t i c l es i z e s
３ Conc l u s i on Thes o f tma e t i cp r op e r t i e so ft heFeS i BCamo r Ｇ gn h o u s o w d e r c o r e s r e a r e d b m e c h a n i c a l Ｇ c r u s h e d p p pp y e r swe r ei nv e s t i a t e d．Howt hemagne t i cp r ope r Ｇ powd g t i e sa th i r equenc ft heco l d Ｇ r e s s edamo r ghf yo p phous rco r e schangedf o rva r i ouspa r t i c l es i z e sf r om powde ２０t o１２５μm wa sa l soexami ned．Thel a r r t i c l e s gepa showl owe rcoe r c i v i t i rpe rme ab i l i t yandh ghe y．The r e l a t i vedens i t ft heamo r rco r e si sr e Ｇ yo phouspowde duc ed wi t h de c r e a s i ng t he pa r t i c l es i z e．The mo r Ｇ l ogyo ft heamo r r madef r om me Ｇ pho phouspowde chan i c a l l rush i ngr i bbonswa se a s obepa s s i va Ｇ yc yt t edandi nsu l a t ed,wh i chimp r ovedt hecha r a c t e r i s t i c o ft heco r el os so f４００kW/m３ a tf＝５０kHz,B m ＝
１０５８
J ou r na lo fI r onandS t e e lRe s e a r ch,I n t e r na t i ona l Vo l ２１
０ １Tandh i Ｇ f r equenc t i cp r ope r t i e swi t h gh y magne t hes t ab l e pe rme ab i l i t u t o１ ０ MH z ． B e c a u s eo f y p t her e l a t i ve l i f１ ６２To ft heFeS i BCamo r Ｇ yh ghBso l l oy,t hepowde rc o r e sc ou l dbeapp l i edun Ｇ phousa de rh i rou t tcu r r en to fpowe rsupp l i e s． ghe pu Re f e r enc e s:
[ １] K． Su z uk i,N．Ka t a ok a,A． I nou e,Ma t e r．T r a n s． J IM． ３１ ( １９９０) ７４３ Ｇ ７４６． [ ２] K．Suzuk i,A．Mak i no,A． I noue,J．App l．Phys．７０ ( １９９１)
６２３２ Ｇ ６２３７． [ ３] MA．Wi l l a r d,D E． Laugh l i n,ME．Mchenr l． Phys． y,J．App ８４ ( １９９８)６７７３ Ｇ ６７７７． [ ４] Y．Kawamur a,A． I noue,T．Ma sumo t o,Jpn． J．App l． Phys． ３５ ( １９９６)８２８ Ｇ ８３０． [ ５] S．Yo sh i da,T．Mi zush ima,T．Ha t ana i,IEEETr ans．Magn． ３６ ( ２０００)３４２４ Ｇ ３４２６． [ ６] GH．Kim,T H．Noh,GB．Cho i,J．App l．Phys． ９３ ( ２００３)
７２１１ Ｇ ７２１３． [ ７] Y．Ogawa,M．Naoe,Y．Yo sh i z awa,J．Magn．Magn．Ma t e r． ３０４ ( ２００６)６７５ Ｇ ６７８． [ ８] A．Mak i no,H．Me n,T．Kubo t a,IEEE．T r a n s．Ma ４５ ( ２００９) gn． ４３０２ Ｇ ４３０５． [ ９] M．Yag i,I．Endo,I．Ot suka,H．Yamamo t o,J．Magn．Magn． Ma t e r． ２１５ Ｇ ２１６ ( ２０００)８４ Ｇ ８７． [ １０] S．Yo s h i d a,T．Mi z u s h ima,T．Ha t a n a i,A． I nou e,IEEE T r a n s． Ma ３６ ( ２０００)３４２４ Ｇ ３４２６． gn． [ １１] I．Ot s uk a,K．Wa d a,Y．Ma e t a,IEEE T r a n s．Ma ４４ ( ２００８) gn． ３８９１ Ｇ ３８９３． [ １２] S．Tang,H．Wang,Z．Wang,Me t a l l i cFunc t i ona lMa t e r i a l s １７ ( ２０１０)No ３,９ Ｇ １２． [ １３] X．Wang,C． Lu,F．Guo,J．Magn．Magn．Ma t e r． ３２４ ( ２０１２) ２７２７ Ｇ ２７３０． [ １４] J．So r t,D C． I l e,AP．Zh i l ev,Sc r i t a Ma t e r． ５０ ( ２００４) ya p
１２２１ Ｇ １２２４． [ １５] R．Nowo s i e l sk i,J J．Wys ł o ck i,I．Wnuk,J．Ma t e r．Pr o c e s s． Te chno l． １７５ ( ２００６)３２４ Ｇ ３２６．