NdFeB cov khoom siv hlau nplaum ruaj khov tuaj yeem muab faib uasintered NdFeB, sib koom NdFeBthiab kub nias NdFeB raws li cov txheej txheem ntau lawm. Vim muaj cov txheej txheem ntau lawm, lawv muaj qhov sib txawv zoo hauv cov khoom sib nqus ntawm cov khoom, tom qab ua tiav thiab daim ntawv thov. Nyob rau theem pib, peb tau ua ib qho kev qhia txog kev sintered NdFeB. Tom ntej no, peb yuav qhia txog kev sib txuas thiab kub nias NdFeB, nrog rau kev sib piv ntawm peb yam khoom NdFeB sib txawv hauv kev ua haujlwm thiab kev siv.
Bonded NdFeB
Bonded hlau nplaum tshwm nyob ib ncig ntawm 1970s, thaum SmCo magenets tau mus txog kev lag luam, sintered NdFeB mus tas li hlau nplaum kev lag luam qhov teeb meem zoo heev, tab sis nws yog ib qho nyuaj rau precision machining rau hauv tshwj xeeb zoo, thiab nyob rau hauv cov txheej txheem ntawm kev ua yog nquag mus cracking, puas, ntug, Lub kaum sab xis thiab lwm yam teeb meem, ntxiv rau, nws tsis yooj yim rau kev sib sau ua ke, kom nws daim ntawv thov raug txwv. Yuav kom daws tau qhov teeb meem no, cov hlau nplaum ruaj khov yog crushed, tov nrog yas thiab nias rau hauv cov duab nyob rau hauv ib tug magnetic teb, uas yog tej zaum lub feem ntau primitive txoj kev ntawm ua bonded hlau nplaum. Bonded NdFeB hlau nplaum yog dav siv vim lawv qhov zoo xws li tus nqi qis, siab qhov tseeb, kev ywj pheej loj ntawm cov duab, zoo mechanical zog thiab lub teeb yuag.
Cov txheej txheem ntau lawm
Bonded NdFeB hlau nplaum yog ua los ntawm cov hlau nplaum ruaj khov hmoov thiab roj hmab los yog cov yas tawv tawv thiab lwm yam khoom siv sib xyaw ua ke, raws li cov neeg siv khoom xav tau ncaj qha rau hauv ntau yam duab ntawm cov hlau nplaum ruaj khov.
Kev npaj cov hmoov hlau nplaum yog cov txheej txheem tseem ceeb ntawm kev ua NdFeB cov hlau nplaum ruaj khov. Cov khoom ntawm magnetic hmoov ncaj qha cuam tshuam rau cov khoom sib nqus ntawm cov hlau nplaum ruaj khov. Cov txheej txheem rau kev npaj NdFeB sib nqus hmoov muaj xws li txhua yam crushing, frit quenching, HDDR, roj tsuag thiab mechanical alloying. Tam sim no, cov thev naus laus zis thev naus laus zis siv HDDR txoj kev, uas yog kev npaj ua haujlwm siab tsis tshua muaj lub ntiaj teb cov hlau nplaum ruaj khov hmoov los ntawm cov txheej txheem ntawm hydrogenation-decomposation-dehydrogenation-recombination: ua ntej, cov hlau tawg rau hauv cov hmoov ntxhib, thauj mus rau hauv lub tshuab nqus tsev. , crystallization kev kho mob ntawm ib tug tej yam kub, lub alloy absorbs hydrogen thiab disproportionates, thiab ces cov hydrogen yog muab rho tawm los recombine rau hauv lub ntiaj teb tsis tshua muaj hlau nplaum hmoov hmoov nrog cov nplej me me heev. Los ntawm txoj kev no, cov nplej zoo nrog qhov nruab nrab particle loj ntawm 0.3μm tuaj yeem tau, thiab cov hmoov sib nqus nrog cov coercivity siab tuaj yeem tau.
Tam sim no, muaj 4 hom kev sib koom ua ke NdFeB nias txheej txheem: calendering, txhaj tshuaj molding, extrusion molding thiab tuag molding, ntawm cov calendering thiab txhaj tshuaj yog ntau mainstream.