Saa asɛm yi ka PTFE ntama a ɛyɛ hyew kɛse a wɔde di dwuma wɔ carbon fiber flat composite nneɛma mu ho asɛm. Compression molding: wɔde si moulds ne prepregs ntam a esiw epoxy resin adhesion ano, na ɛma demolding yɛ mmerɛw; wɔde ahyɛ nnua a ɛyɛ tratraa pii ntam na wɔakwati sɛ wɔbɛbata wɔn ho wɔn ho. Vacuum bag molding: reusable release film ntam prepreg ne breather ntama, ma kwan ma gas / resin fa bere a ɛma ɛyɛ mmerɛw peeling akyi ayaresa; textured side transfers fine surface texture ma bonding roughness tu mpɔn, na eyi sanding fi hɔ. Kɔ so yɛ: seamless non-stick conveyor belts soa prepregs fa ɔhyew / nhyɛso mmeae; cushion layer kyekyɛ nhyɛso pɛpɛɛpɛ tew localized indentations.

Saa asɛm yi hwehwɛ sɛnea ɛbɛyɛ yiye sɛ wɔbɛsa ogyaframa a wɔde sa PTFE ani a wɔbɛsakra no mu na ɛde nkɛntɛnso a ɛwɔ so no toto corona ne plasma ayaresa ho. Nea ebetumi aba: ogyaframa betumi asesa PTFE nanso wɔntaa mfa nni dwuma wɔ mfiridwuma mu — ahobammɔ ho asiane (PTFE porɔw ma awuduru HF ne perfluoroisobutylene fi adi); adwumayɛ anohyeto (surface ahoɔden nkutoo 30-35 mN / m, yɛ mmerɛw hye so). Adwumayɛ akwan: ogyaframa — bere tiaa mu ɔhyew a ɛkorɔn oxidation (>1000°C), etching kakra, oxygen akuw kakraa bi; corona — ahoɔden a ɛkɔ soro a ɛtwetwe no ma ozone/oxygen a ɛyɛ adwuma, oxidation a ɛnyɛ den, ahoɔden a ɛba fam no ntumi mmubu CF nkitahodi ahorow; plasma — nneɛma nketenkete/ɛlektrɔn/free radicals a ahoɔden kɛse wom no paapae CF nkitahodi mu tẽẽ na ɛde polar akuw (hydroxyl, carboxyl, amino) hyɛ mu.

Saa asɛm yi ka sɛnea wɔde coating machine line ahoɔhare ne oven tenten hyia de hwɛ hu sɛ organosilicone adhesive du botae curing degree ma high-temperature PTFE tape. Core matching nnyinasosɛm: bere a wɔde tra hɔ nyinaa t_total = fononoo tenten a etu mpɔn L ÷ line ahoɔhare v ɛnsɛ sɛ ɛba fam sen bere a wɔhwehwɛ sɛ wɔde sa yare a ɛba fam koraa. Nya ayaresa su denam DSC anaa adhesive ayaresa sɔhwɛ ahorow a ɛde 'ɔhyew — ayaresa bere a ɛba fam' abusuabɔ si hɔ. Equivalent cumulative cure model: kyekyɛ fononoo mu yɛ no zones, bu ti=Li/v ne tcure(Ti), hwɛ hu sɛ ∑(ti/tcure(Ti)) ≥1. Nkontaabu nhyehyɛe: hyehyɛ ɔhyew mmeae a ne tenten yɛ Li ne ɔhyew Ti; set line speed v, bu zone biara tena bere ne ntoboa ratio; san yɛ bio kosi sɛ ne nyinaa bɛyɛ ≥1 (wɔkamfo kyerɛ ahobammɔ kwan 1.1-1.2).

Saa asɛm yi ka PTFE dwumadi ahorow a ɛwɔ thermal insulation cladding ma aprɛm engine ahorow mu ho asɛm. Akwan anan: Endothermic decomposition — PTFE depolymerizes wɔ ~ 400 ° C to tetrafluoroethylene (endothermic kɛse, ~ 3,000 ° C combustion gas exposure), twetwe ɔhyew kɛse na yi ɔhyew ahoɔden fi ɔfasu ani. Transpiration cooling ne gas film insulation — mframa a ɛporɔw (tetrafluoroethylene) fa micro-pores mu kɔ abɔnten, na eyi ɔhyew a ɛwɔ soro no fi hɔ; gas film a ɛsen no yi mframa a ɛhyew a ɛyɛ hyew kɛse fi ɔfasu mu, na ɛtew ɔhyew a ɛbɛn ɔfasu no so >50%; gas film sesa hye so layer ahoɔhare/ɔhyew, na ɛtew nneɛma nketenkete a ɛporɔw so.

Saa asɛm yi ka nkɛntɛnso a gamma-ray mframa nya wɔ PTFE nhyehyɛe ne ne su so ho asɛm. Nnuru nhyehyɛe mu nsakrae: gamma mframa bubu CC nkɔnsɔnkɔnsɔn atitiriw ne CF nkɔnsɔnkɔnsɔn a ɛwɔ nkyɛn (G-botae 3.0-3.5), na ɛma nkɔnsɔnkɔnsɔn no mu paapae kɛse na ɛma molecule mu duru so tew kɛse; wɔ oxygen mu no, free radicals yɛ peroxy radicals a ɛde acyl fluoride ne carboxylic acid awiei akuw (hydrolyzing to HF) ba. Condensed structure sesa: crystallinity kɔ soro mfiase no (dose a ɛba fam, nkɔnsɔnkɔnsɔn ntiantiaa san hyehyɛ) afei ɛkɔ fam (dose a ɛkorɔn, sintɔ ahorow sɛe ahwehwɛ); lamellar ahwehwɛ no mu paapae yɛ ahwehwɛ nketewa a ɛyera nhyehyɛe a ɛkɔ akyiri. Agyapadeɛ a ɛsɛe: elongation wɔ break so tew firi 0.1 kGy wɔ mframa mu, ɛhwere >90% wɔ ~1kGy — nneɛma no bɛyɛ den na ɛyɛ brittle; nea ɛyɛ hyew no so tew fi 327°C kodu nea ɛba fam sen 310°C; polar akuw ma dielectric constant/loss kɔ soro kakra; soro sesa fi fitaa kɔ grey/tuntum a gloss hwere.

Saa asɛm yi ka akwan a wɔfa so hwɛ PTFE a wɔde kata Teflon ntama a ɛyɛ hyew kɛse so no ahwehwɛ so. Cooling rate regulation yɛ tẽẽ na etu mpɔn sen biara: Nwini a ɛba ntɛmntɛm (quenching) denam mframa a ɛyɛ nwini ntama, onwini rollers anaa nsu tank so — molecule nkɔnsɔnkɔnsɔn no yɛ nwini ansa na wɔayɛ nhyehyɛe a wɔahyɛ, na ɛyɛ ahwehwɛ nketenkete a ɛnyɛ pɛ; coating yɛ mmerɛw, ɛyɛ den a optimized non-stick adwumayɛ, kakra tew hardness / wear resistance. Slow cooling (annealing) via ɔhyew a wɔkora so ɔfã wɔ 10-50 ° C / h anaasɛ fononoo onwini — molecule nkɔnsɔnkɔnsɔn nhyehyɛe koraa yɛ spherulites akɛse a edi mũ; coating wɔ hardness a ɛkorɔn, ɛda nsow wear resistance, stable dimensions, tew flexibility ne nkɔanim brittleness.

Saa asɛm yi ka Teflon ntama a ɛyɛ hyew kɛse a wɔde gu fononoo a mframa a ɛyɛ hyew di akɔneaba mu ho asɛm. Feasibility: wɔde di dwuma sɛ non-stick cushion wɔ mesh belts anaa trays bere a fononoo hyew ≤260 ° C (low-ɔhyew drying, binder yiyi, slurry curing) — tu mpɔn demolding ne picking efficiency. Wɔabara koraa wɔ ɔhyew a ɛwɔ mfinimfini/ɛkɔ soro (300-950°C) — PTFE porɔw ma awuduru HF ne perfluoroisobutylene fi mu ba, ɛma nnwinnade no sɛe na ɛde awuduru a edi awu ba. Ahobammɔ nnyinasosɛm: sɛ fononoo mu hyew mu nna hɔ anaasɛ wontumi nhyɛ bɔ sɛ ɛbɛba fam sen 260°C a, mfa nni dwuma. Nneɛma titiriw: ɔsom a ɛkɔ so -70°C kosi 260°C, bere tiaa mu 300°C; a ɛnyɛ nea ɛbata ho ne nnuru a ɛnyɛ adwuma a ɛtra so; anyinam ahoɔden a wɔde siw anyinam ahoɔden ano a eye kyɛn so; friction a ɛba fam (~ 0.04); fiberglass nnyinaso ma ahoɔden a ɛkorɔn a ɛtwetwe.

Saa asɛm yi de nsonsonoe a ɛda infrared radiation heating ne hot-air circulation heating curing akwan horow ntam toto crosslinked structure uniformity of silicone adhesive layers ho. Ɔhyew a wɔde kɔ baabi foforo: mframa a ɛyɛ hyew de ne ho to convection-conduction a ɔhyew kɔ soro brɛoo, ɔhyew mu nsonsonoe ketewaa bi a ɛwɔ mu/akyi so; IR wɔ bun a ɛhyɛn mu a anohyeto wom a ɛwɔ soro a ɛtwetwe denneennen (micrometer du kosi ɔhaha pii) a ɛma ɛyɛ sorokɔ-kɔ-mfinimfini a ɛyɛ toro. Nkɛntɛnso a ɛwɔ crosslink biakoyɛ so: mframa a ɛyɛ hyew ma wotumi yɛ synchronous curing wɔ mu ne akyi a crosslink density yɛ pɛ; IR ma soro layer yɛ ntɛmntɛm dense 'skin film' a esiw ɔhyew a ɛkɔ ne emu nkɔnsɔnkɔnsɔn kankan, ma crosslink density so tew fi soro kɔ mu.

Saa asɛm yi fa typical line ahoɔhare range ma Teflon high-temperature ntama impregnation production line. Ahoɔhare ahorow: nneɛma a ɛyɛ tratraa a wɔtaa de di dwuma (0.08-0.30mm) a ɛyɛ 0.5-3 m/min, ɛyɛ pintinn wɔ 1-3 m/min; nneɛma a ɛyɛ den/a wɔde ahyɛ mu pii (≥0.4mm) wɔ 0.3-1 m/min; nhama a ɛyɛ adwuma yiye a fononoo atenten wom betumi adu 3-6 m/min nanso nnwinnade a ɛhwehwɛ pii. Adeyɛ anohyeto ahorow: drying ne sintering hwehwɛ bere a wɔde tra hɔ (PTFE hia simma 1-3 wɔ 380-400°C; nea ɛnnɔɔso de adhesion/cracking a enye ba); ahoɔhare no gyina bere a ɛba fam koraa a wɔde bɛyow/sintering wɔ fononoo tenten a wɔahyɛ da ahyɛ da ase so. Nneɛma anohyeto: solids/viscosity dispersions a ɛkorɔn no hyɛn mu nkakrankakra; ntama a ɛyɛ den/a ɛyɛ den twetwe nsu na ɛde ɔhyew kɔ baabi foforo nkakrankakra; ntama a ɛtrɛw a ɛyɛ mmerɛw sɛ ɛsono kɔla a ɛwɔ ano ne mfinimfini a ɛhwehwɛ sɛ wɔtew ahoɔhare so. Nnwinnade ne nea ɛyɛ papa a wɔde di gua: fononoo atenten a ɛwɔ mmeae pii ma kwan ma wɔde ahoɔhare kɛse di dwuma.

Saa asɛm yi ka nsonsonoe a ɛda PTFE emulsions a wɔyɛ denam suspension polymerization vs dispersion polymerization ntam. Nkyerɛkyerɛmu: suspension polymerization ntumi nyɛ PTFE emulsion tẽẽ; nokware PTFE emulsion fi dispersion polymerization nkutoo mu. 'Suspension-kwan emulsion' yɛ nokwarem no nsu suspension a asase suspension-polymerized resin micropowders. Dispersion polymerization (primary emulsion): spherical particles (0.1-0.3μm, teateaa kyekyɛ), stabilized denam perfluorinated surfactants, molecule mu duru a ɛkorɔn yiye (>94% crystallinity), fibrillation a emu yɛ den, hwehwɛ 380 ° C sintering na ayɛ kɔ so tough film.