Evolution of Seal Materials
Kev hloov pauv ntawm cov ntaub ntawv foob tau hloov zuj zus raws li cov ntsaws ruaj ruaj tau ntsib cov kev xav tau ntau dua.Cov kev xav tau thaum ntxov tuaj yeem ua tau raws li cov khoom siv hemp lossis tawv, tab sis raws li qhov kev xav tau tau dhau los ua cov ntaub ntawv tshiab thiab nruj dua.Qhov no tau coj mus rau kev taw qhia ntawm cov roj hmab cov ntsaws ruaj ruaj, uas hloov mus rau hauv cov hluavtaws elastomers, thiab thaum kawg engineering polymers zoo li PTFE (Polytetrafluoroethylene).
Plaub ntawm cov khoom siv niaj hnub no feem ntau xaiv rau lub ntsej muag lub ntsej muag yog cov roj hmab nitrile, polyacrylate, FKM, thiab PTFE.Ntawm cov ntaub ntawv no, peb yog elastomers - nitrile roj hmab, polyacrylate roj hmab thiab FKM - thiab tsuas yog ib qho yog polymer - PTFE.Cia peb saib yuav ua li cas cov ntaub ntawv sib sau ua ke.
Khoom siv 1: Nitrile Roj Hmab
Nitrile roj hmab mus los ntawm ob peb lub npe, suav nrog acrylonitrile butadiene roj hmab, Buna-N, thiab NBR.Yeej nws yog hluavtaws roj hmab elastomer uas tiv taus qee yam tshuaj tseem ceeb xws li roj, lubricants, thiab roj.Piv nrog rau lwm cov elastomers, nws ua haujlwm zoo heev ntawm kev tiv thaiv kev degradation thiab raug rau lub hnub thiab huab cua.Nws muaj nws txwv, ho.
Khoom siv 2: Polyacrylate Rubber
Polyacrylate hais txog polyacrylate roj hmab thiab qee zaum hu ua ACM.Nws muab cov cua sov zoo dua thiab sib haum nrog cov ncej siab dua li cov roj hmab nitrile.Nws kuj yog qhov zoo heev hauv qee cov ntawv tshwj xeeb xws li cov roj nplua nyeem uas suav nrog cov sulfur.Nws txwv lub zog thiab dej tsis kam yog nws cov yam ntxwv txwv loj.
Khoom siv 3: FKM (Fluoroelastomers)
Nov yog qhov tseeb nthuav: tib neeg feem ntau tsis meej pem txog qhov sib txawv ntawm FKM, FPM, thiab Viton.Lawv tag nrho yog hais txog tib lub hauv paus khoom.Lub npe FKM pom nws cov hauv paus hauv ASTM kev faib tawm ntawm flouroelastomers, thaum FPM yog DIN / ISO abbreviation.Viton yog nws lub npe lag luam, muaj los ntawm DuPont.Cov khoom ntawm FKM yog qhov zoo tshaj plaws ntawm cov roj hmab nitrile lossis polyacrylate roj hmab, ob qho tib si ntawm qhov kub thiab txias ceev, tab sis kuj muaj tshuaj lom neeg.Nws tseem yog qhov kim tshaj plaws ntawm peb elastomers tau tham txog tam sim no.
Khoom siv 4: PTFE (Polytetrafluoroethylene)
PTFE yog qhov zoo tshaj plaws los ntawm nws lub npe lag luam, polymer (tseem muaj los ntawm DuPont).PTFE deb tshaj qhov kev ua tau zoo ntawm nitrile roj hmab, polyacrylate roj hmab, thiab FKM nyob rau hauv cov nqe lus ntawm ncej ceev, kub, thiab tshuaj tiv thaiv.Qhov tseeb, nws muaj cov tshuaj tiv thaiv zoo tshaj plaws ntawm cov polymer lossis elastomer nrog rau qhov qis tshaj coefficient ntawm kev sib txhuam.
Xaus
Daim ntawv qhia hauv qab no qhia tau hais tias cov ntaub ntawv foob plaub no sib koom ua ke li cas ntawm lawv cov kev txwv ceev ceev.PTFE outshines tus so, txawm nyob rau hauv ncej speeds tshaj 30,000 rpm.Thaum koj xaiv lub foob uas xav tau kom muaj sia nyob ib puag ncig corrosive thiab nyuaj ntawm qhov nrawm nrawm, saib tsis pub dhau PTFE.
Post lub sij hawm: May-08-2018