Yuav ua li cas maj mam tsiv teb tsaws ntawm qis -molecular- hnyav additives hauv PTFE sheath ua kom cov defect defect propagation ntawm immersion rhaub

Tsim kom muaj kev hloov chaw ntxiv hauv ib puag ncig hauv kev pabcuam

Ntau cov ntaub ntawv PTFE cov khoom lag luam muaj cov txheej txheem ua haujlwm thiab qis-molecular- hnyav polymer feem. Nyob rau hauv cov cua sov, cov kua infiltration thiab cyclic kev nyuaj siab, cov khoom no maj mam tsiv tawm sab nraud ntawm cov khoom siv mus rau hauv lub plhaub. Kev ntsuam xyuas cov cuab yeej siv feem ntau tsom rau cov tshuaj tiv thaiv corrosion thiab thermal load, tsis quav ntsej txog kev hloov pauv ntawm cov khoom siv sab hauv. Kev puas tsuaj nce mus rau sab hauv mus rau qhov chaw thiab tsis tshua muaj tshwm sim pom pom sab nraud hauv thawj theem.

Kev tsiv teb tsaws ntawm qis-molecular additives: ib tug mechanism ntawm degradation
Qhov tseem ceeb ntawm kev tsav tsheb yog lub zog hluav taws xob txuas ntxiv mus rau qhov tsis tshua muaj - cov khoom molecular mus rau PTFE nto. Raws li cov khoom sib cais tawm, qhov khoob me me yog tsim nyob rau hauv cov khoom. Kev poob ntawm cov khoom txhawb nqa sab hauv los ntawm cov polymer matrix ntawm qhov chaw ua rau poob ntawm qhov tawv thiab ua rau muaj kev cuam tshuam rau sab nraud tshuaj lom neeg thiab kev tawm tsam. Cov qauv PTFE ntom ntom tsis tuaj yeem tawg tau yooj yim los ntawm kev ywj pheej thaum tshav kub kub. Nruam poob ntawm additive tsim intrinsic tsis muaj zog me ntsis uas yooj yim infiltration ntawm lwm corrosive agents. Thaum ntxov subsurface kab noj hniav yog them tom qab undamaged txheej sab nrauv thiab tsis tuaj yeem txheeb xyuas los ntawm cov kev kuaj pom zoo tib yam.

Ntau -Qhov Kev Ua Haujlwm Ua Haujlwm Ua Haujlwm Ua Haujlwm Ua Haujlwm Raws Li Cov Khoom Siv Cov Khoom Sib Txuas
Kev tsiv teb tsaws ntawm cov khoom tawm hauv qhov tsis muaj dab tsi uas ua rau cov pa phem ionic los ntawm cov txheej txheem ua kua ntxiv mus rau hauv lub hnab. Thermal cycling nkoos tsim cov ntsev muaju nyob rau hauv qhov chaw tsis muaj dab tsi thiab lub wedging kev nyuaj siab txuas ntxiv cov voids nyob rau hauv txuas fissures. Cov txheej txheem loosening tiv thaiv ib homogeneous tshav kub conduction thiab txhim kho qhov zais hotspots uas exacerbate lub additive poob txawm ntxiv. Raws li cov kab nrib pleb loj hlob mus rau sab hauv cov khoom cua sov, megohmmeter rwb thaiv tsev tsis tu ncua poob. Cov kws tshaj lij hauv teb feem ntau raug cob qhia los liam qhov tawg ntawm qhov chaw da dej tshuaj yaig, tsis quav ntsej txog qhov ua rau muaj kev cuam tshuam ntawm cov khoom muaj pes tsawg leeg.

Kev tuav tsis raug ntawm cov khoom ntxiv kev tsiv teb tsaws chaw ntawm qhov chaw muaj ntau
Cov txheej txheem rau kev yuav khoom cua sov tsis tshua muaj xws li cov kev txwv hnyav ntawm qis -molecular- qhov hnyav feem ntawm PTFE raw khoom. Cov neeg ua haujlwm saib xyuas hloov cov cua sov uas ua tsis tiav los ntawm kev puas tsuaj ntawm kev tsiv teb tsaws, tab sis tsis hloov kho cov khoom yuav tsum tau ua. Cov cua sov tshiab ua los ntawm PTFE feem ntau yuav raug kev txom nyem dua los ntawm kev hloov pauv ntawm cov khoom siv thaum lub sijhawm ua haujlwm. Ob peb tsis ua hauj lwm tsom xam cov ntaub ntawv sib txawv ntawm sab nraud tsim corrosion puas thiab internally originating cov txheej txheem loosening. Hauv paus ua rau kev tsom xam feem ntau misclassifies xws li degradation li ntshiab thermal aging.

Kev tshuaj xyuas- kev taw qhia kev ua haujlwm thiab kev daws teeb meem zoo rau koj lub hom phiaj
Siv cov qib siab -purity, qis rho tawm cov qib PTFE rau hloov cov cua sov kom txo qis mobile qis- cov seem molecular. Tsis txhob khiav mus rau lub sijhawm ntev nyob ze rau qhov ntsuas kub ntawm cov khoom siv PTFE. Qhov gradient nyob rau hauv qhov kub thiab txias yuav tsum tau qeeb kom tiv thaiv kom txhob tawg sai sai ntawm thermal excitation. Thaum lub sij hawm overhaul tseem ceeb xyuas sheath nto rau npub txheej uas yooj yim abraded. Taug qab kev tiv thaiv kev tiv thaiv lub sijhawm dhau sijhawm siv megohmmeter. Yog tias ntau lub tshuab cua sov ua rau qeeb qeeb, qhov degradation zoo ib yam thiab tsis raug rau cov mob hnyav, ntsuas cov khoom siv raw. Rau kev ua haujlwm kub kub tas mus li, muab qhov tseem ceeb rau kev ruaj ntseg hloov kho PTFE cua sov ntsiab lus.

Economic tus nqi ntawm kev tswj degradation ntawm Additive Migration
Qhov kev xaiv ntawm ruaj khov siab purity PTFE zam kev tawm mus sab nraud ntawm cov khoom tsis muaj molecular, nrog rau kev tsim ntawm cov voids hauv qab hauv cov cua sov sheaths. Cov khoom siv tuab tuab yog tiv taus ntau dua rau kev sib xyaw tshuaj lom neeg thiab kev tawm tsam. Tsawg dua thaum ntxov hloov ntawm cov cuab yeej pab ua kom yooj yim cov khoom seem npaj thiab zam kom tsis txhob xav txog kev tsim khoom. Nws muaj cov qauv ruaj khov, uas tuaj yeem ua kom ntseeg tau qhov kev hloov pauv ntawm cov cua sov, txo qhov kev hloov pauv ntawm cov txiaj ntsig kev kho mob thiab qhov tsis lees txais tus nqi ntev - lub sij hawm ntub dej - txheej txheem ntau lawm.