PTFE fini min funteni ka bon, o ye PTFE finimugu ni fibreglasi substrat faralen ye ɲɔgɔn kan. Ni a kɛra funteni cayalenba la, o fɛn in tɛ 'bɔ' dɔrɔn yɔrɔ dɔ la – a bɛ fɛn caman Changements progressifs (Yɛlɛma caman kɛ farikolo ni kemikaliya) la funteni hakɛ danfaralen naani kɔnɔ.
K’a ta mikro-karili la 260°C la ka se tiɲɛni dafalen ma 500°C+ la, jɔcogo caman yeli bɛ nɔ bila PTFE dacogo la fɔlɔ, o kɔfɛ fibreglasi substrat. Nin taabolo ninnu faamuyali nafa ka bon walasa ka baara kɛ cogo la min tɛ mɔgɔ tɔɔrɔ ani min bɛ se ka da a kan.
Aokai PTFE ye fini minnu datugulen don ni PTFE ye, olu ka funteni kɛcogo sɛgɛsɛgɛ funteni hakɛ bɛɛ kɔnɔ. Nin gafe in bɛ sigicogo caman yeli taabolo jɔnjɔn naani ɲɛfɔ ani ka funteni dantigɛli nafamaw di.
A bɛɛ lajɛlen jɔcogo bɛ to a cogo la k’a sɔrɔ fɛn caman b’a la ka fɛn caman sɛmɛntiya dɔɔnin dɔɔnin, minnu bɛ kɛ ni mikroskɔpi ye.
1. PTFE molekiyɔmu cakɛdaw lafiyali ani kristali ladilanni
Ni funteni bɛ mɛn sen na, o bɛ polimɛri molekiyɔmu cakɛdaw lamaga dɔɔni dɔɔni daminɛ ani ka kristali kɔrɔta dɔɔni. O cogo la, finimugu bɛ wuli dɔɔni ni a ɲɛda gɛlɛya bɛ caya. Nin ye wale ye min bɛ kɛ dɔɔnin dɔɔnin – min bɛ se ka suman lɛri kɛmɛ walima lɛri ba caman kɔfɛ.
2. Farikoloɲɛnajɛ degunw dalajɛli
PTFE bɛ ni funteni-falen-falen hakɛ ye min bɛ se 10×10−5/°C ma , o min ka bon kosɛbɛ ka tɛmɛ fibreglasi kan ni 5×10−6/°C ɲɔgɔn ye . Ni funteni-nɛnɛ-sɛrɛkili segin-segin bɛ kɔnɔna degun lase coating-substrate dancɛ la, a laban na, a bɛ kɛ micro-cracks ye waati kɔnɔ. Nin ye kɔrɔya fɛɛrɛ fɔlɔ ye baarakɛyɔrɔ lakananen kɔnɔ.
3. Fura tolenw farali ɲɔgɔn kan
Surɔfɛn tɔw ni jisumafɛn minnu tora ka bɔ u dilanni na, olu bɛ toli dɔɔni dɔɔni, o bɛ na ni dibi ye dɔɔni fini sanfɛla la. A ka ca a la, o tɛ kojugu ye nka a b’a jira ko fɛn in kɔrɔla.
Funteni min bɛ gɛrɛ ani ka tɛmɛ a wuliyɔrɔ kan – 327°C lamini
Ni PTFE sera a ka wuliyɔrɔ funteni ma dɔrɔn, farikolo-yɔrɔ-ko caman bɛ kɛ.
1. Kristali-yɔrɔ wulicogo
PTFE semi-cristalline opaque milky-white bɛ wuli ka kɛ ji ye min tɛ i n’a fɔ jeli , min bɛ fara a hakɛ bonya kan . O fini bɛ bɔnɛ masin fanga bɛɛ la, wa a bɛ daminɛ ka nɔgɔya ani ka woyo. O waati la, fini bɛ bɔnɛ a hakɛ sabatili n’a jɔcogo dafalen na.
2. Delamination (bɔli) min bɛ kɛ finimugu ni substrat cɛ
Fanga min bɛ jɛ ka dɔgɔya ani degun min bɛ sɔrɔ funteni fɛ, o bɛ kɛ sababu ye ka PTFE wulilen bɔ, ka bɔ, ka woyo ka bɔ fibreglasi fini na, o bɛ na ni delamination composite ye ani ka structural failure. A yɔrɔ min tɛ nɔrɔ, o bɛ tiɲɛ o de kosɔn. Ni delamination (delamination) Kɛra dɔrɔn, a tɛ Se ka Lasegin.
3. Fibreglasi b’a kolotuguda cogoya mara
Fibreglasi fini bɛ to a hakɛ la ka sabati nin waati in na. Ni PTFE lakanani layini tɛ, gilasi filaninw jɛlenw bɛ kɛ fɛn ye min bɛ se ka kɛ oksidan ni kemikɛli ye.
Aokai PTFE lasɔmini: Hali ni taama surunw kɛra ka tɛmɛ 327°C kan, o bɛ kɛ sababu ye ka delamination kɛ min tɛ se ka segin kɔ. Fini bɛ se ka kɛ i n’a fɔ a ma tiɲɛ ni a nɛnɛna, nka PTFE finimugu farala kudayi ka bɔ fibreglasi la, o ye masin dafalen bɛɛ bɔ a la.
Sumaya tiɲɛni daminɛ – 400°C fo 500°C
PTFE molekiyɔmu kɔkolow bɛ daminɛ ni kemikɛli ye, o bɛ na ni sigida tiɲɛni ye min tɛ se ka segin kɔ.
1. Depolimerizasiyɔn fangama
Oksizɛni tɛ sigida minnu na, PTFE bɛ tiɲɛni kɛ i n’a fɔ zipu . CC kovalɛn jɛɲɔgɔnya minnu bɛ cakɛda kunba kan, olu bɛ tiɲɛ, ka gazi monomɛriw bɔ minnu bɛ kɛ fɔlɔ tetarafluoroéthylène (95% ni kɔ) ani hexafluoropropylène ye. Molecules girinya bɛ jigin kosɛbɛ, wa PTFE dacogo bɛ mugumugu ka jɛnsɛn.
2. Oksidan tiɲɛni aerobic cogoyaw la
Oksizɛni bɛ bin karɔbɔni radikaliw kan ani ka gazi toxicw bɔ i n’a fɔ karɔbɔni fluoride (COF2) ani trifluorométhane, ka fara kasa nɔgɔlen nɔgɔlen dɔ kan. Fluoride d’hydrogène (HF) ni perfluoroisobutylene (PFIB) fana bɛ se ka bɔ cogo dɔw la.
3. Aw bɛ karɔbɔli tolenw nɔfɛtaama
PTFE saniyalen bɛ wuli ka surunya pewu ni karɔbɔli tolen tɛ. A ka c’a la, fini nɛrɛmuguma bɛ bɔ fibreglasi hakɛ jateminɛnanw ka karɔbɔni na, sanfɛla nɔgɔw, walima komonomɛri misɛnninw na PTFE suguya caman sɛmɛntiyalen na.
4. Fibreglasi bonyalanw jeni
Sizeriw organiques minnu datugulen don fibreglas filaments kan, olu bɛ toli ka tɛmɛ 350°C kan. Glass filaments tɛ ɲɔgɔn nɔrɔ ɲɔgɔn na tuguni, o bɛ fini kɛ fɛn ye min bɛ kɛ wuluwulu ye ani a ka teli ka wuli.
(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
Ɲɛfɔli : PTFE fini 450°C kɛlen kɔfɛ – finimugu tolilen don pewu, ka tolen karɔbɔlen dɔrɔn to yen ani fibreglasi min bɛ kɛnɛ kan, min bɛ kɛ ni wuluwulu ye.
Tiɲɛni yɔrɔ min ka bon ni funteni ye – ka tɛmɛ 500°C kan
PTFE dacogo tununna pewu, ka fibreglasi substrat gansan dɔrɔn to yen min bɛ doni ta min bɛ to senna funteni caman na.
1. E-glasi fiyɛri nɔgɔyali
E-glasi fibre standard ka nɔgɔya hakɛ bɛ se 840°C ma . O bɛɛ n’a ta, a sɔgɔli fanga bɛ Dɔgɔya kosɛbɛ ka Tɛmɛ 500°C kan. Ni a sumana ka tɛmɛ 800°C kan, fibreglasi fini bɛɛ bɛ nɔgɔya, ka bɔgɔbɔgɔ, ka sɔgɔsɔgɔ ani ka jɔli dɛmɛni seko tiɲɛ.
2. Kɔrɔbɔli ni devitrification (devitrification) min bɛ funteni caman na
Ni aw bɛ funteni caman kɛ waati jan kɔnɔ, o bɛ gilasi fiɲɛw sɔgɔsɔgɔli daminɛ, o kɔfɛ, devitrification ni pulverization bɛ kɛ ka fini jɔcogo tiɲɛ pewu. Nin waati in na, fini tɛ dɔn tuguni i n’a fɔ fini – a bɛ kɛ galasi fiyɛw kulu lafiyalen ye, min bɛ se ka tiɲɛ.
Aokai PTFE bɛ ladilikan di ko baara kuntaalajan funteni ka kan ka kɔlɔsi kosɛbɛ 260°C duguma ani ka waati kunkurunnin kuncɛyɔrɔw dan fo ka se 300°C ma walasa ka baara kɛcogo tiɲɛ ani lakana farati minnu bɛ se ka sɔrɔ delamination ni funteni tiɲɛni fɛ.
N’aw b’a fɛ ka fɛɛrɛko paramɛtiriw caman sɔrɔ, baarakɛcogo misaliw ani furaw sɔrɔ minnu bɛ kɛ ka kɛɲɛ ni mɔgɔw sago ye an ka fɛn dilannenw bɛɛ lajɛlen na, i n’a fɔ PTFE fini min bɛ funteni caman bɔ, PTFE kasɛti nɔrɔlen min bɛ funteni caman na, PTFE cɛsirilan min bɛ funteni caman bɔ, cɛsirilan min tɛ sɔgɔ, PTFE fini min bɛ kɛ fan kelen fɛ, cɛsirilan min bɛ se ka funteni caman kɛlɛ ani min bɛ se ka funteni kɛlɛ fibre de verre fini, aw bɛ se ka an sɔrɔ ni kunnafoni ye min bɛ duguma:
An bɛ baarakɛcogo ɲuman ni danbe sabati i n’a fɔ an ka jago hakilila jɔnjɔn, an cɛsirilen don ka izini ɲɛnabɔcogo kelen di ani ka baara kɛ ni hakilijagabɔ ye min ɲɛsinnen bɛ kiliyanw ma!
