Kev txhuam hniav yog qhov tus tswv cuab txav uas cov tswv cuab txav mus ua ib tus zawv zawg kom tsim hluav taws xob txuas. Lub txhuam txhuam yog siv los ua cov nplais tiv tauj lub cev rau cov kev tawm tswv yim thiab tawm ntawm cov khoom siv ntawm commutator lossis lub nplhaib ntiv nplhaib. Nws yuav tsum muaj cov hluav taws xob thiab lub zog zoo nkauj, thiab muaj qee yam ntawm lub zog thiab muaj peev xwm los tua cov hluav taws xob tawg. Muab faib ua cov ntaub ntawv txhuam sib txawv:
1. Daim duab txhuam txhuam, uas yog tsim los ntawm kev ntxiv cov binder xws li asphalt lossis thee tar rau ntuj graphite. Nws muaj cov ntawv mos, zoo lubricating kev ua tau zoo thiab tsis tshua muaj kev sib txhuam coefficient, tab sis nws yog ib qho yooj yim rau kev puas tsuaj qhov rectifier vim ntau impurities.
2. Electrochemical graphite txhuam, uas yog ua los ntawm graphite, coke, thiab lwm yam, thiab ua tiav ntawm qhov kub ntawm ntau tshaj 2500 ° C. Nws cov kev ua tau zoo tshaj plaws yog siv rau hauv txhua hom ntawm lub cev muaj zog thiab lub cev muaj zog nrog qhov nyuaj txhim kho.
3. Hlau graphite carbon txhuam. Nws yog tsim los ntawm infiltrating tooj liab rau hauv graphite thiab sib tov me me ntawm cov hmoov hlau xws li tin thiab txhuas. Nws muaj cov conductivity zoo heev thiab loj nqa tam sim no muaj peev xwm, thiab yog qhov tshwj xeeb tshaj yog tsim rau AC kiav txhab asynchronous motors thiab DC cov cav tam sim no.
4. Ntshiab hlau ntshiab Nws yog ua los ntawm cov ntawv hlau nyias. Qee lub sij hawm txhawm rau txhawm rau txhim kho kev ua tau zoo, sab saum npoo ntawm hlau ntawv yog coated nrog lwm cov hlau zoo. Piv txwv, silver palladium alloy. Qhov txhuam no muaj cov hluav taws xob zoo heev. Kev poob ntawm tus txhuam tsis loj, tab sis qhov hnav tsis kam tsis zoo, uas ua rau lub neej tsis muaj lub zog. Vim tias tus txhuam txhuam yog nyias, nws tsis tuaj yeem tiv thaiv qhov dej loj. Feem ntau siv hauv kev tsim kho me me ntawm cov kauj.