Roj hmab ntoo nplaum yog ib lub sij hawm dav dav rau cov khoom elastomeric nrog cov khoom sib nqus. Nws yog tsim los ntawm cov roj hmab nyom, cov hlau nplaum (cov hlau nplaum hlau) thiab lwm cov koom haum. Cov khoom sib nqus yog cov khoom siv ntawm cov roj hmab hlau nplaum. Roj Hmab Roj Hmab Tshaj Tawm Tuaj Sib Xeem Sib Txuas Sib Thooj Zog Sib Tshab Roj Hmab Sib Cuam Tshaj Tawm ntawm cov hlau nplaum sib txawv hauv lub nras sab nraud,
Txij li cov roj hmab nws tsis yog hlau nplaum, nws cov khoom siv magnetism los ntawm ntau cov hmoov hlau sib txawv (2 ~ 8 npaug ntawm cov roj hmab cuav), yog li cov hlau nplaum yog qhov tseem ceeb ntawm kev tsim cov roj hmab hlau. Raws li cov kab no, sib nqus additives tau faib ua ob pawg: hlau nplaum hmoov thiab ferrite hmoov, collectively hu ua magnetic hmoov. Hlau hlau nplaum hlau muaj hlau cobalt hmoov, hlau nickel hmoov, hlau strontium hmoov thiab iron barium hmoov, ntawm cov pa cob coos yog qhov feem ntau siv. Hlau hlau nplaum yog tsuj tsawg vim siv ntawm tus nqi siab thiab kev nyuaj hauv kev ntxiv. Tam sim no, iron oxide hmoov yog ntau dua siv. Nws muaj hlau oxide thiab qee qhov kev tsom nqi ntawm ob qho khoom siv hlau. Txawm tias tib ferrite sib nqus hmoov, qhov kawg ntawm lub sib nqus zog yuav txawv vim qhov txawv crystalline morphology, particle loj thiab uniformity.
Kev tsim cov khoom siv ntawm cov roj hmab hlau nplaum yog zoo ib yam li lwm cov khoom. Rau qhov formulation, peb yuav tsum xub txiav txim seb qhov ntau, qhov loj thiab ntau npaum li cas ntawm cov hlau nplaum. Tom ntej no, lub roj hmab hom yuav tsum tau txiav txim siab raws li cov kev cai. Piv txwv li, roj hmab yuav tsum raug xaiv rau kev hnav lub cev. Thaum lub sijhawm ua, ua ntej thiab tom qab vulcanization, nws yog ib qho tsim nyog ntxiv cov magnetization cov txheej txheem uas tsis tas yuav tsum tau ua hauv lwm cov khoom ua rau muab cov khoom lag luam tas mus li. Qhov zoo ntawm qhov sib txawv ntawm qhov ua ntej yuav tsum yog qhov uas tsis muaj qhov sib txawv ntawm qhov chaw magnetic yuav tsis hloov, thiab nws yuav yooj yim dua los ntawm cov roj hmab network; Yog hais tias tau magnetizing tom qab vulcanization lub rubber lub permeability tau pluag, tab sis lub lag luam yog yooj yim dua. Hauv ib lo lus, txhua tus nyias muaj nyias qhov zoo thiab qhov tsis zoo.
Cov zauv ntawm lub cev uas siv los piav txog cov khoom sib nqus muaj xws li kev sib nqus sib nqus, qhov sib txawv ntawm cov nqaij ntshiv, cov khoom sib nqus zog thiab lwm yam. Feem ntau yog siv cov khoom sib nqus uas yog ntsuas Gauss (GS). Feem ntau ntawm cov roj hmab khaus magnet feem ntau yuav tsum tau mus txog 100 ~ 600 GS.