Thermal oxidation aging fragmentation tsis ua hauj lwm yog hais txog PFA hauv ob sab phlu ua haujlwm nyob rau hauv ntev -lub sij hawm tsis tu ncua siab- qhov kub thiab txias ib puag ncig nrog oxygen permeation. Cov saw hlau polymer molecular tau dhau oxidative cleavage thiab hla - txuas cov tshuaj tiv thaiv ib kauj ruam, cov khoom maj mam poob yooj thiab ductility, thiab hloov mus rau hauv lub xeev tawv thiab nkig. Raws li kev hloov pauv me ntsis, dej rauj cuam tshuam los yog lub raj xa dej vibration, cov kab nrib pleb kis thoob plaws hauv ob sab phlu, ua raws li qhov loj - thaj tsam tawg, pulverization thiab tev tawm ntawm cov yeeb nkab steel sab hauv phab ntsa. Cov fluoroplastic fragments thaiv cov yeeb nkab hla, thiab nruab nrab corrosive ncaj qha mus rau lub hauv paus yeeb nkab kom induce rust sai nkag thiab to. Qhov kev ua tsis tiav no yog qhov tsis tuaj yeem hloov pauv cov tshuaj degradation ntawm cov ntaub ntawv polymer, uas feem ntau tshwm sim nyob rau hauv siab -kub cua sov kav nrog ntev- lub sij hawm dhau - qhov kub thiab txias kev pab cuam thiab tsis txaus oxygen cais.
1. Thermal Oxidation Aging thiab Brittleness Degradation Mechanism
PFA fluoropolymer tswj cov qauv molecular ruaj khov nyob rau hauv nws qhov tsim tau qhov kub thiab txias. Thaum lub sijhawm ua haujlwm kub siab tshaj qhov ntev - lub sijhawm kev pabcuam rau lub sijhawm ntev, cov pa oxygen yaj hauv qhov nruab nrab lossis nkag mus los ntawm cov txheej txheem me me tawm tsam cov pa roj carbon - cov roj carbon tseem ceeb ntawm PFA. Nruam oxidation lov ntev molecular chains rau hauv luv luv fragments, lub caij no ib nrab cross-txuas ua rau cov khoom nruj thiab nkig. Lub elongation ntawm kev tawg thiab cuam tshuam toughness poob qis, thiab hauv ob sab phlu tsis tuaj yeem nqus cov kev ntxhov siab sab nraud los ntawm elastic deformation. Cov kab nrib pleb me me nthuav tawm sai sai nyob rau hauv kev sib hloov load, thiab tag nrho cov hauv ob sab phlu rau hauv flaky los yog powdery khib nyiab thiab ntog tawm. Qhov sib txawv ntawm qhov qis - kub brittleness uas yog reversible toughness txo, thermal oxidation aging ua rau mus tas li molecular qauv kev puas tsuaj, thiab hauv ob sab phlu tsis tuaj yeem rov qab tau nws thawj qhov kev ua tau zoo txawm tias tom qab kub txo.
2. Cov hauj lwm zoo ua rau muaj kev puas tsuaj rau kev laus
Cov kav xa dej nyob ze tshaj plaws rau qhov chaw cua sov nrog qhov nruab nrab kub siab tshaj plaws thiab lub sijhawm cua sov ntev tshaj plaws;
Cov kav dej tuag nrog qhov nruab nrab zoo li qub uas tsis tuaj yeem rov ua dua tshiab, cov pa oxygen txuas ntxiv koom nrog cov tshuaj tiv thaiv oxidation;
Nyias hauv ob sab phlu nrog cov nyhuv tsis muaj zog tiv thaiv cov pa oxygen infiltration thiab kev laus sai;
Pipeline sab sauv roj-theem ntu uas huab cua sib sau ua ke thiab cov pa oxygen ntau dua li cov kua theem;
Flange hauv paus qhov khoob qhov twg cov huab cua sab nraud nkag mus rau hauv interlayer kom nrawm nrawm ntawm kev laus.
3. Core Inducing Factors Accelerating Aging Failure
Ntev -lub sij hawm overtemperature ua hauj lwm deb tshaj qhov ntsuas kub ua hauj lwm tas li ntawm PFA khoom;
Qhov nruab nrab muaj cov pa oxygen ntau dhau yam tsis muaj kev kho deoxidation ua ntej nkag mus rau hauv cov kav dej;
Hauv ob sab phlu muaj qhov sib txawv ntawm cov pinholes thiab qhov khoob, muab cov kev sib txuas rau cov cua sab nraud kom nkag mus rau cov txheej txheem sib txuas;
Tsis muaj thermal rwb thaiv tsev qhwv ntawm cov kav dej sab nrauv phab ntsa, sab nraud oxygen txuas ntxiv mus rau hauv cov khoom siv hauv ob sab phlu;
Ntau xyoo uas tsis muaj kev cuam tshuam tsis yog - nres ua haujlwm yam tsis muaj kev kaw thiab kev tshuaj xyuas, ua rau muaj kev puas tsuaj oxidative tsis tu ncua.
4. Tag nrho -Txuas Kev Tiv Thaiv thiab Tswj Kev Ntsuas Kev Ntsuas
① nruj nreem kaw lub sab sauv txwv ntawm nruab nrab kub raws li cov ntaub ntawv technical tsis
Txwv tsis pub ntev - lub sijhawm ua haujlwm kub dhau los txiav tawm cov xwm txheej ntawm cov saw hlau molecular oxidation.
② Configure deoxidation thiab degassing khoom nyob rau hauv pem hauv ntej kawg ntawm cov txheej txheem system
Txo cov ntsiab lus oxygen yaj hauv qhov nruab nrab conveying los ntawm qhov chaw.
③ Ua kom nruj qhov ntsuas qhov ntsuas thiab ntsuas huab cua nruj rau cov kav dej ua ntej xa khoom
Thaiv cov pa oxygen infiltration channel uas tshwm sim los ntawm cov kab mob micropore defects.
④ qhwv ua tiav thermal rwb thaiv tsev thiab sealing txheej tiv thaiv rau tag nrho sab nraum zoov thiab siab -kub cov yeeb nkab seem
Cais atmospheric oxygen nkag mus rau hauv cov txheej txheem hauv ob sab phlu.
⑤ Teem sijhawm tsis tu ncua kev saib xyuas thiab kev tshuaj xyuas endoscopic
Hloov cov hnub nyoog hnyav thiab embritted yeeb nkab fittings ua ntej ua ntej fragmentation shedding.
5. Kev Tiv Thaiv Cov Teeb Meem Sib piv
表格
| Kev ua haujlwm & kev tiv thaiv hom | Thermal Aging Fragmentation Risk | Daim ntawv thov tswv yim |
|---|---|---|
| Ntev -lub sij hawm overtemperature + tsis nruab nrab deoxidation + tsis muaj txheej sealing rwb thaiv tsev | Hauv ob sab phlu embrittlement pulverization thiab blockage to tshwm sim nyob rau hauv ob peb xyoos kev pab cuam | Hloov cov kav dej laus thiab kho qhov kub thiab txias thiab nruab nrab pretreatment system |
| Kub tswj kev sib cuam tshuam + nruab nrab degassing kev kho mob + tiav cov khoom tsis pom kev + kev tiv thaiv sab nraud | Ua tau zoo qeeb oxidative degradation thiab ua rau lub neej ntev kev pab cuam | Txuj kev ua haujlwm thiab kev tiv thaiv tshwj xeeb rau siab -kub PFA lined cua sov kav |
| Los tiv thaiv -oxidation hloov PFA hauv ob sab phlu + online kub tiag tiag- lub sij hawm saib xyuas + xyoo kev laus kev ua tau zoo sampling soj ntsuam | Tsis tshua muaj brittle shedding thiab pipeline blockage zais txaus ntshai | Cov tswv yim nyiam rau kev tsim khoom tsis cuam tshuam siab -kub los tiv thaiv -corrosion cua sov pipeline system |
Xaus
PFA hauv ob sab phlu thermal oxidation aging brittle fragmentation tsis ua hauj lwm yog tshwm sim los ntawm qhov kub thiab txias thiab oxygen ua ke rhuav tshem cov thawj polymer molecular qauv, uas ua rau irreversible poob ntawm cov khoom toughness thiab zaum kawg fragmentation peeling. Cov kev tiv thaiv tseem ceeb muaj xws li kev tswj xyuas qhov kub thiab txias, tshem tawm cov pa oxygen hauv cov txheej txheem nruab nrab, tshem tawm cov txheej txheem nkag mus rau hauv ob sab phlu kom tsis txhob muaj cov pa oxygen nkag mus, ntxiv cov txheej txheem sealing kev tiv thaiv thiab ua raws li kev soj ntsuam thiab hloov. Tag nrho - txheej txheem kaw- kev tswj lub voj voog ntawm kev ua haujlwm tsis zoo, nruab nrab pretreatment, kev tshuaj xyuas lub Hoobkas thiab kev saib xyuas txhua hnub tuaj yeem zam cov khoom siv kaw thiab kev nyab xeeb ntawm kev sib tsoo tshwm sim los ntawm kev laus degradation ntawm PFA kab cua sov raj.
