Nsakrae a ɛba PTFE ntama a ɛyɛ hyew kɛse mu wɔ tebea horow a ɛyɛ hyew kɛse mu

PTFE ntama a ɛyɛ hyew kɛse yɛ PTFE a wɔde kata so ne fiberglass substrate a wɔabom ayɛ. Sɛ wɔde to ɔhyew a ɛkɔ soro mu a, saa ade yi nnyɛ 'nwene' kɛkɛ wɔ bere bi mu – ɛfa honam fam ne nnuru mu nsakrae a ɛkɔ so nkakrankakra wɔ ɔhyew ahorow anan a ɛsono emu biara mu.

Efi micro-cracking wɔ 260°C so kosi decomposition koraa wɔ 500°C+ so no, nsakrae a ɛba wɔ nhyehyɛe mu no ka PTFE coating no kan, afei fiberglass substrate no. Saa akwan horow yi ntease ho hia na ama wɔatumi ayɛ adwuma a ahobammɔ wom na wotumi de ho to so.

Aokai PTFE ayɛ ɔhyew nneyɛe a ɛwɔ ntama a wɔde PTFE akata so no mu nhwehwɛmu wɔ ɔhyew ahorow nyinaa mu. Saa akwankyerɛ yi kyerɛkyerɛ nhyehyɛe mu nsakrae atitiriw anan no mu na ɛde ɔhyew anohyeto a mfaso wɔ so ma.

Bere Tenten Ɔsom Ɔhyew a Ɛwɔ Hɔ – Ɛba fam Bɛyɛ 260°C

Nneɛma a wɔahyehyɛ no nyinaa kɔ so yɛ nea ɛyɛ den kakra bere a nsakrae a ɛyɛ brɛoo a wɔde hwɛ nneɛma nketenkete kɔ so nkakrankakra no.

1. Ahomegye a PTFE molecule nkɔnsɔnkɔnsɔn ne crystallinity nsakrae

Ɔhyew a ɛtra hɔ kyɛ no kanyan polymer molecule nkɔnsɔnkɔnsɔn no nkakrankakra na ɛma crystallinity kɔ soro kakra. Enti ade a wɔde kata so no dan yɛ mmerɛw kakra bere a ne soro yɛ den kɛse no. Eyi yɛ adeyɛ a ɛyɛ brɛoo – wotumi susuw wɔ nnɔnhwerew ɔhaha anaa mpempem pii akyi.

2. Nneɛma a ɛboaboa ano a ɛyɛ interfacial thermal stress

PTFE wɔ ɔhyew-ntrɛwmu nsusuwii a ɛyɛ bɛyɛ 10×10−5/°C , a ɛkorɔn koraa sen fiberglass wɔ bɛyɛ 5×10−6/°C . Ɔhyew-awɔw kyinhyia mpɛn pii no ma emu nhyɛso ba wɔ coating-substrate hye so, na awiei koraa no ɛyɛ mpaapaemu nketenkete bere tenten. Eyi ne onyin kwan titiriw a ɛwɔ adwumayɛbea a ahobammɔ wom no mu.

3. Nneɛma a wɔde ka ho a wɔde ka ho no a wɔma ɛyɛ hyew

Nneɛma a aka a ɛma ntama no yɛ hyew ne nneɛma a ɛma ɛyɛ nwini a aka wɔ ne yɛ mu no porɔw nkakrankakra, na ɛma ntama no ani yɛ sum kakra. Mpɛn pii no, eyi nyɛ asiane biara nanso ɛkyerɛ sɛ ade no reyɛ anyin.

Ɔhyew a Ɛbɛn na Ɛboro Nsuo a Ɛbɔ – Bɛyɛ 327°C

Sɛ PTFE du ne hyew a ɛyɛ hyew no ho pɛ a, nsakrae kɛse ba honam fam-nhyehyɛe mu.

1. Crystalline-ɔmantam a ɛyɛ hyew

PTFE a ɛyɛ fitaa a ɛte sɛ nufusu a ɛyɛ fã bi a ɛnyɛ hann no dan nsu a ɛte sɛ gel a enni nsɛ a ne kɛse ntrɛwmu a ano yɛ nnam ka ho . Nneɛma a wɔde kata so no hwere mfiri ahoɔden nyinaa na efi ase yɛ mmerɛw na ɛsen. Saa bere yi de, ntama no hwere ne kɛse a ɛyɛ den ne ne nhyehyɛe mudi mu kura.

2. Delamination ntam coating ne substrate

Tumi a ɛka bom a ɛso tew ne nhyɛso a ɔhyew a ɛtrɛw de ba no ma PTFE a ayɛ nwini no yɛ kurukuruwa, yiyi, na ɛsen fi fiberglass ntama no ho, na ɛde composite delamination ne structure di huammɔdi ba. Nea efi mu ba ne sɛ, nea ɛnkyere so no sɛe. Sɛ delamination ba pɛ a, ɛyɛ nea wontumi nsakra.

3. Fiberglass kura ne nnompe nhyehyɛe mu

Fiberglass ntama no da so ara yɛ nea ɛyɛ den wɔ ne kɛse mu wɔ saa bere yi mu. Sɛ PTFE a ɛbɔ ho ban no nni hɔ a, ahwehwɛ nhama a ɛda hɔ kwa no bɛyɛ nea ɛyɛ mmerɛw sɛ oxidation ne nnuru bɛsɛe.

Aokai PTFE kɔkɔbɔ: Nsrahwɛ ntiantiaa a ɛboro 327°C mpo ma delamination a wontumi nsakra. Ebia ntama no bɛyɛ sɛ nea enni dɛm bere a ɛyɛ nwini no, nanso PTFE a wɔde akata so no atetew afi fiberglass no ho koraa, na ayera mfiri no mudi mu kura nyinaa.

Ɔhyew a ɛporɔw mfiase – 400°C kosi 500°C

PTFE molecule akyi nnompe fi ase sɛ nnuru mu paapae, na ɛde nhyehyɛe no mu sɛe a wontumi nsakra no ba.

1. Depolymerization adeyɛ a ɛwɔ tumi kɛse

Wɔ mmeae a oxygen nni mu no, PTFE sɛe ade a ɛte sɛ zip . CC covalent bonds a ɛwɔ nkɔnsɔnkɔnsɔn titiriw no so no sɛe, na ɛma mframa monomers a ɛyɛ tetrafluoroethylene (bɛboro 95%) ne hexafluoropropylene titiriw. Molekyule mu duru so tew kɛse, na PTFE a wɔde kata so no mu yɛ kurukuruwa na ɛyera.

2. Oxidative decomposition wɔ aerobic tebea horow mu

Oxygen tow hyɛ carbon free radicals so na ɛma mframa a awuduru wom te sɛ carbonyl fluoride (COF2) ne trifluoromethane ba, na hua a ano yɛ den a ɛyɛ yaw ka ho. Wobetumi ayi hydrogen fluoride (HF) ne perfluoroisobutylene (PFIB) nso afi mu wɔ tebea horow bi mu.

3. Trace carbon nkae a ɛwɔ mu no akyi

Ɛkame ayɛ sɛ PTFE kronkron no yɛ nwini koraa a carbon nkae biara nni mu. Mpɛn pii no, kɔla tuntum a ɛsakra wɔ ntama no so no fi carbonization a ɛwɔ fiberglass sizing agents, efĩ a ɛwɔ soro, anaa comonomers nketenkete a ɛwɔ modified-grade PTFE mu no mu.

4. Nneɛma a wɔde yɛ fiberglass a ɛma nneɛma yɛ kɛse a wɔhyew

Nneɛma a wɔde yɛ nneɛma akɛse a wɔde fiberglass nhama akata so no porɔw boro 350°C. Glass nhama ntumi nkɔ so ntumi nkɔ so, na ɛma ntama no yɛ fĩ na ɛyɛ mmerɛw sɛ ɛbɛbɔ.

(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

Caption: PTFE ntama wɔ 450°C akyi – ade a wɔde kata so no aporɔw koraa, na ɛka carbonized nkae ne fiberglass a ɛda adi, a ɛyɛ fĩ nkutoo.

Beae a Ɔsɛe no wɔ Ɔhyew a Ɛkorɔn – Ɛboro 500°C

PTFE a wɔde kata so no ayera koraa, na aka fiberglass substrate a ɛda hɔ kwa no nkutoo a ɛsoa adesoa a ɛyɛ hyew a ɛkɔ so daa.

1. E-glass fiber a ɛyɛ mmerɛw

Standard E-glass fiber wɔ baabi a ɛyɛ mmerɛw bɛyɛ 840°C . Ne nyinaa mu no, ne twetwe ahoɔden no sɛe kɛse boro 500°C. Sɛ wɔma ɛyɛ hyew boro 800°C a, fiberglass ntama no nyinaa yɛ mmerɛw, ɛyɛ mmerɛw, na ɛhwe ase na ɛhwere tumi a ɛboa ɔdan no.

2. Ɔhyew a ɛkorɔn creep ne devitrification

Ɔhyew a ɛkɔ soro bere tenten ma ahwehwɛ nhama no trɛw kɔ baabiara, na ɛno akyi no, devitrification ne pulverization a ɛma ntama no nhyehyɛe no bubu koraa. Saa bere yi de, wontumi nhu ntama no bio sɛ ​​ntama – ɛbɛyɛ ahwehwɛ nhama a ɛyɛ mmerɛw na ɛyɛ mmerɛw.

Nsɛm a Wɔaboaboa Ano – Ɔhyew Gyinabea ne Anohyeto a Ɛho Hia

Aokai PTFE kamfo kyerɛ sɛ ɛsɛ sɛ wɔhwɛ ɔhyew a wɔde yɛ adwuma bere tenten a ɛba fam sen 260°C so denneennen na wɔmfa bere tiaa mu ɔhyew a ɛkɔ soro no ano hye nkɔ 300°C a ɛsen biara na wɔakwati adwumayɛ a entumi nyɛ adwuma yiye ne ahobammɔ ho asiane ahorow a ebetumi aba esiane delamination ne ɔhyew a ɛporɔw nti.

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