Lub sintering ntawm sintered NdFeB yog ib qho ntawm cov txheej txheem tseem ceeb tshaj plaws

Sintered NdFeB yog cov hlau nplaum anisotropic tsim los ntawm cov hmoov sintering. Feem ntau, tsuas yog blanks tuaj yeem tsim los ntawm sintering, thiab tom qab ntawd los ntawm kev siv tshuab (xws li hlau txiav, txiav, sib tsoo, thiab lwm yam) los ua hlau nplaum ntawm ntau yam duab. Lub sintering ntawm sintered NdFeB hais txog qhov yuav tsum tau ua kom sov lub cev ntsuab hauv qab lub melting point ntawm hmoov matrix theem nyob rau hauv thiaj li yuav ntxiv txhim kho cov kev ua tau zoo thiab usability ntawm cov hlau nplaum, txhim kho cov kev sib cuag ntawm cov hmoov, nce lub zog, thiab ua kom lub zog. Cov hlau nplaum muaj qhov ua tau zoo microstructural yam ntxwv. kub thiab ua kom sov rau ib lub sijhawm.

Sintering yog txheej txheem tseem ceeb heev hauv sintered NdFeB, thiab tag nrho cov tuam ntxhab thiab cov kws tshawb fawb muab qhov tseem ceeb rau nws. Tus txheeb ze ntom ntom ntawm NdFeB hmoov compacts feem ntau yog 50% mus rau 70%, thiab cov porosity feem ntau yog 30% mus rau 50%. Kev sib txuas ntawm cov khoom yog tag nrho cov khoom siv sib txuas, thiab lub zog sib txuas yog qhov tsawg heev. Yog hais tias lub molding siab siab heev, ib co ntawm cov hais uas tau nyob rau hauv kev sib cuag nrog ib tug twb undergone elastic los yog yas deformation. Lub sijhawm no, cov qauv no feem ntau yuav tawg, thiab nws cov microstructure tsis txaus los tsim cov khoom sib nqus siab.

Thaum lub sij hawm sintering txheej txheem ntawm sintered NdFeB lub cev, ib tug series ntawm lub cev thiab tshuaj hloov pauv yuav tshwm sim. Ua ntej, cov pa roj (xws li dej vapor) adsorbed rau saum npoo ntawm cov hmoov av yog tshem tawm, evaporation thiab volatilization ntawm cov organic teeb meem (xws li roj uas yuav stained thaum lub sij hawm isostatic nias los yog ntxiv antioxidants thiab lubricants, thiab lwm yam), lub Kev ntxhov siab raug tshem tawm, thiab qhov chaw ntawm cov hmoov hmoov yog txo qis ntawm oxides, rov qab thiab recrystallization ntawm deformed hmoov hais.

Nyob rau hauv tej yam kev mob kub, uas yog, thaum dynamics tso cai, kev sib cuag ntawm hmoov hais yuav yog los ntawm taw tes rau saum npoo thiaj li yuav txo tau qhov chaw nto thiab lub zog nto. Raws li qhov chaw sib cuag ntawm cov khoom nthuav dav, lub cev ntsuab pib ntsws thiab densify, dhau los ua sintered NdFeB. Hauv luv luv, sintering yog cov txheej txheem uas cov hmoov sib xyaw ua ke hloov ntawm lub cev ntsuab mus rau lub cev ntxhib.