PTFE avɔ si me dzoxɔxɔ le ŋutɔ nye PTFE ƒe nutsyɔnu kple fiberglass substrate ƒe ƒuƒoƒo. Ne wotsɔe de dzoxɔxɔ si le dzidzim ɖe edzi me la, nu sia me 'melt' ko le ɣeyiɣi aɖe me o – etoa dzɔdzɔmeŋusẽ kple atike ƒe tɔtrɔ vivivi siwo kplɔ wo nɔewo ɖo me le dzoxɔxɔ ƒe didime vovovo ene me.
Tso micro-cracking le 260°C dzi va ɖo decomposition keŋkeŋ le 500°C+ dzi la, xɔtuɖaŋu ƒe tɔtrɔwo kpɔa ŋusẽ ɖe PTFE ƒe nutsyɔnu dzi gbã, emegbe fiberglass substrate dzi. Afɔɖeɖe siawo gɔmesese le vevie ŋutɔ hafi woate ŋu awɔ dɔ le dedie eye kakaɖedzi le eŋu.
Aokai PTFE ku avɔ siwo ŋu wofa PTFE ɖo ƒe dzoxɔxɔ ƒe nuwɔna me le dzoxɔxɔ ƒe didimewo katã me. Mɔfiame sia ɖe xɔtuɖoɖo ƒe tɔtrɔ ƒe afɔɖeɖe vevi eneawo me eye wòna dzoxɔxɔ ƒe seɖoƒe ŋutɔŋutɔwo.
Ɣeyiɣi Didi ƒe Subɔsubɔdɔ ƒe Dzoxɔxɔ ƒe didime – Le ete Anɔ abe 260°C ene
Nuwo ƒe wɔwɔme bliboa nɔa te vie esime tɔtrɔ siwo wowɔna blewuu, siwo wokpɔna le nusuekpɔmɔ̃ me la le edzi yim vivivi.
2. Dzoxɔxɔ ƒe nuteɖeamedzi si le domedome ƒe ƒuƒoƒo
PTFE ƒe dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ ƒe xexlẽdzesi si ade 10×10−5/°C , si kɔkɔ sã wu fiberglass le abe 5×10−6/°C ene . Dzoxɔxɔ kple fafa ƒe tsatsam enuenu hea ememe nuteɖeamedzi vɛ le nusi wotsɔ blae kple nusi wotsɔ blae ƒe liƒo dzi, eye mlɔeba la, ewɔa ʋuʋudedi suesuesuewo le ɣeyiɣi aɖe megbe. Esiae nye tsitsi ƒe mɔnu vevitɔ le dɔwɔwɔ ƒe mɔnu si le dedie me.
3. Nusiwo wotsɔ kpe ɖe eŋu susɔeawo ƒe dzoxɔxɔ
Nusiwo susɔ siwo wɔa dɔ ɖe anyigba kple tsilénu siwo susɔ tso ewɔwɔ me la gblẽna vivivi, si wɔnɛ be avɔa ƒe anyigba do viviti vie. Zi geɖe la, esia megblẽa nu le ame ŋu o gake efia be nusi wotsɔ wɔe la le tsitsim.
Dzoxɔxɔ si gogo eye wòwu dzoxɔxɔ ƒe teƒea – Anɔ abe 327°C ene
Ne PTFE nya ɖo eƒe dzoxɔxɔ si me wòxɔ dzo le ko la, dzɔdzɔmeŋusẽ kple xɔtuɖoɖo ƒe tɔtrɔ wɔnuku aɖe dzɔna.
1. Crystalline-nutome ƒe ʋeʋẽ
PTFE si ƒe amadede nye kristalo afã kple afã si me mekɔ o si le abe notsi ene la trɔna zua tsi si le abe gel ene si me nɔnɔme mele o si kpe ɖe eƒe lolome ƒe kekeɖenudɔ ɖaɖɛ ŋu . Mɔ̃a ƒe ŋusẽ katã meganɔa nusi wotsɔ blae la ŋu o eye wòdzea fafa kple sisi gɔme. Le ɣeyiɣi sia me la, avɔa megate ŋu nɔa te ɖe eƒe didime nu o eye megate ŋu nɔa eƒe xɔtunu ƒe blibonyenye me o.
2. Delamination le coating kple substrate dome
Ŋusẽ si ɖea nu ɖekawɔwɔ dzi dzi ɖeɖe kpɔtɔ kple nuteɖeamedzi si dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ hena vɛ nana PTFE si wotsɔ ƒo ƒui la ƒoa ƒu, ƒuna, eye wòsina dzona le fiberglass avɔa ŋu, si wɔnɛ be nusiwo wotsɔ ƒo ƒui ƒe ʋuʋu kple xɔtuɖaŋu ƒe kpododonu. Esia gblẽa nu le anyigba si dzi womeléna ɖo o ŋu. Ne delamination nya dzɔ ko la, womate ŋu atrɔe o.
3. Fiberglass léa eƒe ƒunukpeƒe ƒe wɔwɔme me ɖe asi
Fiberglass avɔa gakpɔtɔ li ke le eƒe didime nu le afɔɖeɖe sia me. Ne PTFE ƒe ƒuƒoƒo si kpɔa ame ta mele eme o la, ahuhɔ̃e ƒe ka ƒuƒluwo va zua esiwo ŋu oxidation kple atikewo ƒe ʋuʋu le bɔbɔe.
Aokai PTFE ƒe nuxlɔ̃ame: Tsaɖiɖi kpui siwo wu 327°C gɔ̃ hã hea delamination si womate ŋu atrɔ o vɛ. Avɔa ate ŋu adze abe ɖe megblẽ o ne efa ene, gake PTFE si wotsɔ blae la ɖe eɖokui ɖa tso fiberglass la gbɔ tegbee, si na mɔ̃a ƒe blibonyenye katã bu.
Dzoxɔxɔ ƒe Gbegblẽ ƒe gɔmedzedze – 400°C va ɖo 500°C
PTFE molecule ƒe megbeƒuwo dzea atikewo ƒe mama gɔme, si hea xɔtuɖoɖo ƒe gbagbã si womate ŋu atrɔ o vɛ.
1. Depolymerization ƒe nuwɔna si xɔ aƒe ɖe eme
Le nuto siwo me oxygen mele o me la, PTFE toa zip-ƒomevi ƒe gbegblẽ me . CC covalent kadodo siwo le kɔsɔkɔsɔ gã la dzi gblẽna, eye woɖea ya ƒe monomer siwo me tetrafluoroethylene (si wu 95%) kple hexafluoropropylene koŋ le la dona. Molekyulãwo ƒe kpekpeme dzi ɖena kpɔtɔna ŋutɔ, eye PTFE ƒe nutsyɔnu la vuvuna eye wòkakana.
2. Oxidative ƒe gbegblẽ le aerobic nɔnɔmewo me
Oxygen dzea carbon free radicals dzi eye wònaa ya siwo me aɖi le abe carbonyl fluoride (COF2) kple trifluoromethane ene dona, eye ʋeʋẽ lilili sesẽ aɖe kpena ɖe eŋu. Woate ŋu aɖe haidrodzin fluoride (HF) kple perfluoroisobutylene (PFIB) hã le nɔnɔme aɖewo me.
3. Di carbon ƒe nugbagbevi siwo susɔ la yome
PTFE dzadzɛa tsia ya keŋkeŋ kloe carbon si susɔ manɔmee. Zi geɖe la, amadede yibɔ ƒe tɔtrɔ le avɔa ŋu tsoa fiberglass ƒe lolomedzidzenuwo, anyigba ƒe ɖiƒoƒo, alo comonomers suesuesue siwo le PTFE si wogbugbɔ trɔ me ƒe carbonization gbɔ.
4. Fiberglass ƒe lolomedzidzenuwo ƒe dzobibi
Nu gbagbewo ƒe lolomedzidzenu siwo wofa ɖe fiberglass kawo dzi la gblẽna wu 350°C. Glass-kawo megaléna ɖe wo nɔewo ŋu o, si wɔnɛ be avɔa ƒuna eye wòte ŋu ƒoa ƒu bɔbɔe.
(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照片
Nya si woŋlɔ ɖe edzi: PTFE avɔ le 450°C ƒe dodo vɔ megbe – nusi wotsɔ blae la gblẽ keŋkeŋ, si susɔ carbonized residue kple fiberglass si woɖe ɖe go, si me fu le ko.
Dzoxɔxɔ Kɔkɔtɔ ƒe Tsɔtsrɔ̃ƒe – Ewu 500°C
PTFE ƒe nutsyɔnu la bu keŋkeŋ, eye fiberglass-nu si le ƒuƒlu koe susɔ si tsɔa dzoxɔxɔ si nu sẽ ƒe agba si yia edzi.
1. E-glass fiber ƒe fafa
E-glass ka si wozãna ɖaa ƒe fafaƒe ade 840°C . Ke hã, eƒe tenɔnɔ ƒe ŋusẽ dzi ɖena kpɔtɔna ŋutɔ wu 500°C. Ne wodo dzoe wòwu 800°C la, fiberglass avɔ bliboa fa, etrɔna, eye wògena eye megate ŋu léa xɔa ɖe te o.
2. Dzoxɔxɔ gã ƒe ʋuʋudedi kple devitrification
Dzoxɔxɔ gã ƒe ɣeyiɣi didi nana ahuhɔ̃e ƒe kawo nɔa tsatsam, eye wotsɔa devitrification kple pulverization kplɔnɛ ɖo si nana avɔa ƒe wɔwɔme mu keŋkeŋ. Le afɔɖeɖe sia me la, womegate ŋu dea dzesi avɔa be enye avɔ o – eva zua ahuhɔ̃e ka siwo le gbadzaa, siwo mebɔbɔ o.
Kpuie ko la – Dzoxɔxɔ ƒe Akpawo kple Seɖoƒe Veviwo
Dzoxɔxɔ ƒe Agbɔsɔsɔme
PTFE ƒe Nutsyɔtsyɔ
Fiberglass ƒe Nusi Wotsɔ Wɔe
Avɔ ƒe Nɔnɔme Bliboe
≤260°C ƒe dzoxɔxɔ
Blewu micro-cracking, additive volatilization
Dze mo anyi
✅ Dɔwɔwɔ – ɣeyiɣi didi zazã dedie
260-327°C ƒe dzoxɔxɔ
Fafa, nuteɖeamedzi ƒe ƒuƒoƒo
Dze mo anyi
⚠️ Gbegblẽ dzea egɔme – ɣeyiɣi kpui aɖe ko
~327°C (si le ƒoƒom) .
Melts, delaminates, mebu eƒe wɔwɔme o
Dze mo anyi
❌ Afɔku – nusiwo wogblẽna si womate ŋu atrɔ o
327-400°C ƒe dzoxɔxɔ
Wotsɔe ƒu gbe, si le sisim, si mexɔa nutsyɔnu o
Eli ke (gake womekpɔa eta o) .
❌ Mewɔa dɔ o – nutsyɔnu ma
400-500°C ƒe dzoxɔxɔ
Egblẽna, eɖea ya siwo me aɖi le la dona
Sizing xɔa dzo
❌ Afɔku – dzudzɔ si me aɖi le, xɔtuɖoɖo ƒe bu
>500°C ƒe dzoxɔxɔ
Edzo keŋkeŋ
Efa >500°C, efa >840°C
❌ Xɔtuɖaŋu ƒe kpododonu keŋkeŋ
Aokai PTFE kafui be woakpɔ ŋusẽ ɖe dɔwɔwɔ ƒe dzoxɔxɔ si anɔ anyi ɣeyiɣi didi si mede 260°C o dzi vevie eye woaɖo seɖoƒe na ɣeyiɣi kpui ƒe dzoxɔxɔ si sɔ gbɔ wu 300°C be woaƒo asa na dɔwɔwɔ ƒe kpododonu kple dedienɔnɔ ƒe afɔku siwo ate ŋu ado tso delamination kple dzoxɔxɔ ƒe gbegblẽ gbɔ.
