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 de akwan abiɛsa a wɔfa so sɔ nneɛma a wɔde nkata silicone nhyɛso ase no hwɛ sɛnea ɛte no yɛ pɛpɛɛpɛ no toto ho. Solvent extraction (gel content) susuw insoluble network fraction via Soxhlet extraction — overestimates esiane honam fam entangled afã horow a wodi mfomso sɛ crosslinks, pɛpɛɛpɛ ±2-5%, nnuru a ɛba fam koraa pɛpɛɛpɛ. DSC susuw residual reaction heat (α=1-ΔHresidual/ΔHtotal) — wotumi de ho to so wɔ low-to-medium nsakrae mu nanso ɛboro so wɔ nsakrae a ɛkorɔn mu esiane diffusion-limited residual groups nti, repeatability <±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 ho asɛm. 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 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 den 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 nkyekyɛmu), 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.

Saa asɛm yi hwehwɛ nkɛntɛnso a platinum catalyst type ne concentration nya wɔ crosslinking kinetics a addition-cure silicone rɔba. Catalyst ahorow: Speier catalyst (chloroplatinic acid, Pt4+) hwehwɛ sɛ wɔtew so ma ɛyɛ nnam low-valent species, a ɛyɛ adwuma sɛ precatalyst; Karstedt aduru a ɛma nneɛma yɛ kɛse (Pt0 a divinyltetramethyldisiloxane ka ho) hyɛn nneɛma a ɛma nneɛma yɛ kɛse no mu tẽẽ. Type effects: Speier kyerɛ induction bere a ɛda adi pefee a S-shaped curing curve (ɛyɛ brɛoo ntɛm, ɛyɛ ntɛmntɛm akyiri yi) ne activation ahoɔden a ɛda adi sɛ ɛkorɔn; Karstedt kyerɛ sɛ induction biara nni hɔ, mfiase rate a ɛkorɔn a exotherm a ano yɛ nnam wom, activation ahoɔden a ɛba fam.