PTFE high-temperature ntaub yog ib qho kev sib xyaw ntawm PTFE txheej thiab fiberglass substrate. Thaum raug kub hnyiab, cov khoom siv no tsis tsuas yog 'melt' ntawm ib qho chaw - nws tau dhau los ntawm kev hloov pauv ntawm lub cev thiab tshuaj lom neeg nyob rau plaub qhov sib txawv ntawm qhov kub thiab txias.
Los ntawm micro-cracking ntawm 260 ° C kom tiav decomposition ntawm 500 ° C +, cov qauv kev hloov pauv cuam tshuam rau PTFE txheej ua ntej, ces cov fiberglass substrate. Kev nkag siab txog cov theem no yog qhov tseem ceeb rau kev ua haujlwm nyab xeeb thiab txhim khu kev qha.
Aokai PTFE tau txheeb xyuas tus cwj pwm thermal ntawm PTFE-coated fabrics thoob plaws txhua qhov kub thiab txias. Phau ntawv qhia no piav qhia txog plaub theem kev hloov pauv ntawm cov qauv tseem ceeb thiab muab kev txwv qhov kub thiab txias.
Lub Sijhawm Kev Pabcuam Lub Sijhawm Ntev Ntev - Hauv qab kwv yees li 260 ° C
Tag nrho cov qauv nyob ruaj khov thaum qeeb, kev hloov kho microscopic maj mam tshwm sim.
1. So ntawm PTFE molecular chains thiab crystallinity hloov
Lub sij hawm ntev thermal raug ua rau maj mam txav ntawm polymer molecular chains thiab marginally nce crystallinity. Cov txheej yog li hloov me ntsis brittle nrog nce hardness. Qhov no yog txheej txheem qeeb - ntsuas tau tom qab ntau pua lossis ntau txhiab teev.
2. Sib txuam ntawm interfacial thermal stress
PTFE nta lub thermal-expansion coefficient ntawm kwv yees li 10 × 10⁻⁵ / ° C , uas yog siab tshaj fiberglass ntawm txog 5 × 10⁻⁶ / ° C. Rov ua dua thermal-txias cycling ua rau muaj kev ntxhov siab sab hauv ntawm thaj tsam txheej-substrate, nws thiaj li tsim micro-cracks dhau sijhawm. Qhov no yog thawj txheej txheem kev laus hauv kev nyab xeeb kev ua haujlwm.
3. Volatilization ntawm residual additives
Cov surfactants thiab cov dej ntub dej uas tseem tshuav los ntawm kev tsim khoom decompose me ntsis, ua rau faint darkening ntawm cov ntaub nto. Qhov no feem ntau tsis muaj teeb meem tab sis qhia tias cov khoom muaj kev laus.
Kub nce mus txog thiab tshaj qhov Melting Point - Nyob ib ncig ntawm 327 ° C
Thaum PTFE nce mus txog qhov kub ntawm qhov kub thiab txias, qhov kev hloov pauv ntawm lub cev-txheej txheem tshwm sim.
1. Crystalline-thaj av melting
Semi-crystalline opaque milky-dawb PTFE hloov mus rau hauv ib qho amorphous gel-zoo li kua nrog los ntawm kev nthuav dav dav . Lub txheej poob tag nrho cov neeg kho tshuab lub zog thiab pib soften thiab ntws. Nyob rau ntawm lub sijhawm no, cov ntaub poob nws qhov kev ruaj ntseg thiab kev ncaj ncees.
2. Delamination ntawm txheej thiab substrate
Txo cohesive quab yuam thiab thermal-expansion-induced kev ntxhov siab ua rau molten PTFE rau blister, tev tawm, thiab ntws tawm ntawm fiberglass ntaub, uas ua rau puas delamination thiab structural tsis ua hauj lwm. Qhov uas tsis yog-stick nto yog puas lawm. Thaum delamination tshwm sim, nws yog irreversible.
3. Fiberglass tswj nws lub cev pob txha
Cov ntaub fiberglass tseem nyob ruaj khov nyob rau theem no. Yog tsis muaj PTFE txheej tiv thaiv, liab qab iav filaments ua rau oxidation thiab tshuaj yaig.
Aokai PTFE ceeb toom: Txawm tias luv luv mus ncig ua si saum toj 327 ° C ua rau tsis tuaj yeem delamination. Cov ntaub yuav zoo li qub thaum txias, tab sis PTFE txheej tau sib cais tas li ntawm fiberglass, poob tag nrho cov neeg kho tshuab kev ncaj ncees.
Pib ntawm Thermal Decomposition - 400 ° C rau 500 ° C
PTFE molecular nraub qaum pib tshuaj cleavage, nqa txog irreversible structural puas.
1. Dominant depolymerization cov tshuaj tiv thaiv
Nyob rau hauv ib puag ncig tsis muaj pa oxygen, PTFE tau dhau los ua tus zipper-hom degradation . CC covalent daim ntawv cog lus ntawm cov saw tseem ceeb tawg, tso cov pa roj carbon monoxide feem ntau suav nrog tetrafluoroethylene (tshaj 95%) thiab hexafluoropropylene. Molecular hnyav poob qis, thiab PTFE txheej pulverizes thiab dissipates.
2. Oxidative decomposition nyob rau hauv aerobic tej yam kev mob
Oxygen tawm tsam cov pa roj carbon dawb radicals thiab tsim cov pa phem xws li carbonyl fluoride (COF₂) thiab trifluoromethane, nrog rau cov ntxhiab tsw qab ntxiag. Hydrogen fluoride (HF) thiab perfluoroisobutylene (PFIB) kuj yuav raug tso tawm raws li qee yam mob.
3. Taug qab carbon residue
Ntshiab PTFE vaporizes yuav luag tag tsis muaj cov pa roj carbon seem. Cov xim dub ntawm cov ntaub feem ntau yog los ntawm carbonization ntawm fiberglass sizing cov neeg ua haujlwm, cov kab mob ntawm cov kab mob, lossis cov me me hauv cov qib PTFE hloov.
4. Hlawv-tawm ntawm fiberglass sizing tus neeg sawv cev
Organic sizing agents coated on fiberglass filaments decompose saum 350 ° C. Cov iav filaments poob kev sib nrig sib adhesion, uas ua rau cov ntaub fluffy thiab nquag fuzzing.
(配图4插入位置：本节末尾，展示PTFE在400°C以上分解后仅剩碳化残留物和裸露玻纤的）
Caption: PTFE npuag tom qab 450 ° C raug - txheej tag decomposed, tsuas yog carbonized residue thiab raug, fluffy fiberglass.
Kev puas tsuaj kub siab - siab tshaj 500 ° C
Lub PTFE txheej tau ploj tag lawm, tsuas yog cov liab qab fiberglass substrate bearing nruam high-temperature load.
1. softening ntawm E-iav fiber ntau
Standard E-iav fiber ntau muaj qhov muag muag ntawm kwv yees li 840 ° C. Txawm li cas los xij, nws lub zog tensile degrades ntau tshaj 500 ° C. Thaum rhuab tshaj 800 ° C, tag nrho cov ntaub fiberglass softens, deforms, thiab sags thiab poob peev xwm txhawb nqa.
2. High-kub creep thiab devitrification
Kev kub siab ntev ntev ua rau muaj kev nkag siab ntawm cov iav fibers, ua raws li devitrification thiab pulverization uas ua rau tag nrho cov qauv ntaub. Nyob rau theem no, cov ntaub yog tsis pom zoo li textile - nws dhau los ua ib qho xoob, tawg ntawm iav fibers.
Summary - Cov theem kub thiab qhov tseem ceeb txwv
Qhov kub thiab txias
PTFE txheej
Fiberglass Substrate
Zuag qhia tag nrho Fabric Status
≤ 260 ° C
qeeb micro-cracking, additive volatilization
ruaj khov
✅ Muaj nuj nqi - siv mus ntev kom nyab xeeb
260-327 ° C
Softening, kev ntxhov siab ntau ntxiv
ruaj khov
⚠️ Degradation pib - luv luv xwb
~ 327 ° C (melting)
Melts, delaminates, poob qauv
ruaj khov
❌ Kev puas tsuaj – irreversible puas
327-400 ° C
Molten, ntws, poob kev pab them nqi
Stable (tab sis tsis muaj kev tiv thaiv)
❌ Non-functional – txheej cais
400-500 ° C
Decomposes, tso tawm toxic gases
Sizing hlawv tawm
❌ Kev phom sij - cov pa phem, cov khoom poob
> 500 ° C
tag lawm
Softens > 500 ° C, melts > 840 ° C
❌ Ua tiav kev ua tsis tiav
Aokai PTFE pom zoo kom nruj tswj lub sij hawm ntev kev khiav hauj lwm kub hauv qab 260 ° C thiab txwv lub sij hawm luv luv peaks mus rau 300 ° C siab tshaj plaws kom tsis txhob ua hauj lwm tsis ua hauj lwm thiab tej zaum yuav muaj kev ruaj ntseg txaus ntshai los ntawm delamination thiab thermal decomposition.
Cov ntsiab lus hais saum toj no yog muab los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.
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