Thaum cov hlau nplaum ntsib qhov kub siab tshaj qhov nws muaj peev xwm tiv taus, nws yuav poob qee qhov ntawm nws cov hlau nplaum tam sim ntawd. Yuav tsum tau kub npaum li cas? Qhov no nyob ntawm qhov coercivity ntawm cov hlau nplaum, uas feem ntau yog qhia los ntawm cov ntawv tom qab qib hlau nplaum, xws li N40H, nrog cov khoom sib nqus siab tshaj plaws ntawm 40, thiab H sawv cev rau qhov kub thiab txias ntawm 120 degree. Qhov siab dua qhov coercivity, qhov tsawg dua nws yuav poob cov hlau nplaum (demagnetization), thiab ntau dysprosium hlau ntxiv rau cov hlau nplaum.
Nws yuav poob npaum li cas magnetism?
Qhov no nyob ntawm seb nws muaj kev tiv thaiv zoo li cas, thiab nws pab yog tias muaj qee qhov hlau nyob ib puag ncig. Ntawm chav kawm, qhov no nyob ntawm qhov kub thiab txias, tab sis nws yog cov nyhuv nonlinear heev. Nws tsis poob ib qho hlau nplaum kom txog thaum nws ncav cuag qhov kub thiab txias, thiab tom qab ntawd nws sai sai poob tag nrho cov hlau nplaum. Nco ntsoov tias tus nqi ntawm cov hlau nplaum nws poob yog nyob ntawm qhov kub thiab txias npaum li cas, tsis yog lub sijhawm ntev ntawm qhov kub thiab txias. Thaum cov hlau nplaum ncav cuag qhov kub thiab txias, nws yuav poob tag nrho cov hlau nplaum nws tuaj yeem ua tiav ntawm qhov kub ntawd. Nws yuav siv sij hawm ntev npaum li cas kom tsis muaj hlau nplaum?
Rau qee cov hlau nplaum me me, demagnetization yuav tshwm sim tam sim ntawd. Txawm li cas los xij, txawm tias cov hlau nplaum me me, nws yuav siv sij hawm rau cov cua sov kom hloov ntawm qhov chaw mus rau qhov chaw. Piv txwv li, ib feem 1cm3 yuav siv sij hawm ob peb feeb. Txawm li cas los xij, qhov chaw ntawm cov hlau nplaum ze rau saum npoo yuav poob kev ua haujlwm tam sim ntawd. 200 degree, txawm nyob rau hauv Fahrenheit los yog Celsius, yog siab heev rau hlau nplaum. Tshwj tsis yog tias koj muaj cov hlau nplaum tshwj xeeb, qib siab dua (UH lossis AH lossis zoo dua), koj yuav ua kom puas tag nrho.
Taw qhia rau kev coercivity ntawm txhua qib ntawm NdFeB hlau nplaum:
N-qib neodymium hlau nplaum: qis coercivity
M-qib neodymium hlau nplaum: nruab nrab coercivity
H-qib neodymium hlau nplaum: siab coercivity
SH-qib neodymium hlau nplaum: ultra-siab coercivity
Uh-qib neodymium hlau nplaum: ultra-siab coercivity
EH-qib neodymium hlau nplaum: siab coercivity
Los ntawm N rau EH, cov tom qab muaj qhov kub thiab txias dua thiab cov nqi siab dua. Lwm cov hlau nplaum tiv taus kub muaj xws li samarium cobalt, ferrite, aluminium nickel cobalt, thiab lwm yam.
