Isotropic sai quenched tsawg lub ntiaj teb cov hlau nplaum ruaj khov hmoov
Kev npaj ntawm cov hmoov sib nqus sib nqus yog qhov sib txawv ntawm cov sintered NdFeB vim sintered NdFeB alloy ingot los yog sintered lub cev tsis muaj cov tswv yim coercivity thaum tawg mus rau particle loj siv los khi cov hlau nplaum. Kev tsim khoom loj yog npaj nyob rau hauv ib puag ncig inert gas. Lub molten alloy yog txias ntawm 105 ~ 106 degree / s thiab condensed rau hauv microcrystalline los yog txawm amorphous qauv. Tom qab crystallization thiab kev kho cua sov, cov nplej loj hlob mus rau kaum lossis ntau pua nanometers, thiab kev coercivity siab tau txais hauv cov nplej submicron me dua qhov loj ntawm Nd2Fe14B ib leeg-domain.
Feem ntau, nws yog qhov nyuaj rau cov khoom sib nqus kom tawg mus rau hauv cov khoom siv zoo li no, thiab cov cuab yeej ntawm kev loj hlob ntawm submicron nplej los ntawm kev ceev ceev quenching tsis paub tab. Yog li ntawd, polycrystalline hmoov yog tsim los ntawm melting ceev quenching txoj kev, thiab yooj yim magnetization axis ntawm txhua grain tsis muaj zog disposition nyiam, thiab cov magnetic particles yog isotropic. Xws li qhov txias txias yog ua tiav los ntawm kev muab pov tseg lossis txau cov kua dej kub molten alloy mus rau hauv cov dej txias rotating tooj liab log nrog linear tshaj tawm ntawm 16 30m / s. Cov kua alloy yog muab pov tseg raws li tangent kev taw qhia nyob rau hauv lub acceleration ntawm lub rotating tooj liab log thiab yog condensed rau hauv ib tug nyias strip nrog ib tug tuab ntawm ~ 100μm. Tus nqi txias rhiab heev txiav txim siab qhov loj ntawm cov nplej nyias. Nws tuaj yeem cuam tshuam rau cov duab ntawm demagnetization nkhaus thiab intrinsic coercivity ntawm magnetic hmoov.
Raws li qhov txias txias nyob ntawm ntau yam xws li alloy kua kub, khiav ceev, tooj liab log ceev thiab kub, argon cua, thiab lwm yam., nws yog ib qho nyuaj rau nruj tswj thiab synchronize optimization. Yog tias qhov zoo tshaj plaws quenchable nanocrystalline microstructure raug coj los ua lub hom phiaj ntau lawm, nws yooj yim heev ua rau kev faib cov nplej loj dhau lawm, thiab qhov sib txuam coercivity faib ntawm cov nplej kuj dav, uas ua rau tsis zoo square degree ntawm demagnetization nkhaus ntawm magnetic hmoov. .
