Sengoliloeng sena se akaretsa lits'ebetso tsa lesela la mocheso o phahameng oa PTFE ka har'a lihlahisoa tse kopaneng tsa carbon fiber flat. Compression molding: beha pakeng tsa hlobo le prepregs thibela epoxy resin adhesion, ho etsa hore ho be bonolo ho phunya; e kentsoeng lipakeng tsa liphanele tse ngata tse tšesaane ho qoba ho khomarelana. Mokotla oa vacuum: filimi e ka sebelisoang hape pakeng tsa lesela la prepreg le breather, e lumellang tsela ea khase / resin ha e ntse e nolofalletsa ho ebola habonolo ka mor'a phekolo; lehlakore le entsoeng ka masela le fetisa sebopeho se setle sa bokaholimo ho ntlafatsa bonding roughness, ho felisa sanding. Tlhahiso e tsoelang pele: mabanta a conveyor a se nang lithupa a tsamaisa li-prepregs ka libaka tsa ho futhumatsa / ho hatella; cushion layer e arola khatello ka mokhoa o ts'oanang ho fokotsa li-indentations tsa sebakeng seo.

Sengoliloeng sena se hlahloba monyetla oa kalafo ea lelakabe bakeng sa phetoho ea bokaholimo ba PTFE mme se bapisa litlamorao le kalafo ea corona le plasma. Ho khoneha: lelakabe le ka fetola PTFE empa le sebelisoa ka seoelo indastering - likotsi tsa ts'ireletso (PTFE e senya ho lokolla HF e chefo le perfluoroisobutylene); ts'ebetso e lekanyelitsoeng (matla a holim'a metsi feela 30-35 mN / m, a theha moeli o fokolang oa moeli). Mekhoa ea ho sebetsa: lelakabe - oxidation ea nakoana e phahameng ea mocheso (> 1000 ° C), ho chesa hanyenyane, lihlopha tse seng kae tsa oksijene; Corona - ho tsoa ha matla a matla ho hlahisa ozone / oksijene e sebetsang, oxidation e bonolo, matla a tlase a matla a ke keng a senya li-bond tsa CF; plasma - likaroloana / lielektrone / li-radicals tsa mahala tse nang le matla a phahameng li phunya ka ho toba li-bond tsa CF le lihlopha tsa polar tse hlomathisitsoeng (hydroxyl, carboxyl, amino).

Sengoliloeng sena se bapisa ho nepahala ha mekhoa e meraro ea tlhahlobo ea 'curring degree' bakeng sa likhomaretsi tse sa utloeng khatello ea silicone. Solvent extraction (gel content) e lekanya karoloana ea marang-rang e sa tsitsang ka ho ntša Soxhlet - likhakanyo tse feteletseng ka lebaka la likarolo tse ferekaneng tsa 'mele tse fosahetseng e le li-crosslink, ho nepahala ± 2-5%, ho nepahala ha lik'hemik'hale tse tlaase ka ho fetisisa. DSC e lekanya mocheso o setseng oa karabelo (α=1-ΔHresidual/ΔHtotal) - e ka tšeptjoang ka phetoho e tlase ho ea bohareng empa e lekanya haholo ka phetoho e phahameng ka lebaka la lihlopha tsa masala a fokolang, ho pheta-pheta <± 2%.

Sengoliloeng sena se bua ka mesebetsi ea PTFE ka har'a meaho e futhumatsang ea li-missile. Mekhoa e mene: Endothermic decomposition — PTFE depolymerizes at ~ 400°C to tetrafluoroethylene (highly endothermic, ~3,000°C conmbustion gas exposure), e monya mocheso o moholo le ho ntša matla a mocheso holim’a lebota. Pholiso ea transpiration le ho kenya filimi ea khase - likhase tsa ho bola (tetrafluoroethylene) li kenella ka ntle ka li-micro-pores, li tlosa mocheso o holim'a metsi; filimi ea khase e phallang e arola khase e tukang ea mocheso o phahameng leboteng, e fokotsa mocheso o haufi le lebota ka > 50%; filimi ea khase e fetola lebelo / mocheso oa moeli oa moeli, e fokotsa khoholeho ea likaroloana.

Sengoliloeng sena se akaretsa litlamorao tsa mahlaseli a gamma ho sebopeho le thepa ea PTFE. Liphetoho tsa sebopeho sa lik'hemik'hale: mahlaseli a gamma a pshatla liketane tse ka sehloohong tsa CC le liketane tsa mahlakoreng a CF (G-boleng 3.0-3.5), e bakang scission e kholo ea ketane le ho theoha ho hoholo ha boima ba limolek'hule; ka oksijene, li-radicals tsa mahala li theha li-radicals tsa peroxy tse hlahisang acyl fluoride le lihlopha tsa ho qetela tsa carboxylic acid (hydrolyzing ho HF). Sebopeho sa condensed se fetoha: crystallinity e phahama qalong (lethal dose e tlaase, liketane tse khutšoanyane li hlophisa bocha) ebe lia oa (lethal dose le phahameng, likoli li senya likristale); sekhechana sa likristale tsa lamellar ho li-crystallite tse nyane tse nyametseng ka tatellano ea nako e telele. Ho senyeha ha thepa: bolelele nakong ea khefu bo fokotseha ho tloha ho 0.1 kGy moeeng, ho lahleheloa ke > 90% ho ~ 1kGy - thepa e fetoha e thata le e brittle; ntlha e qhibidihang e theoha ho tloha ho 327°C ho ya tlase ho 310°C; lihlopha tsa polar hanyenyane phahamisa dielectric kamehla / tahlehelo; ho fetoha ha bokahodimo ho tloha ho bosweu ho ya ho botsou/ botsho ka tahlehelo ya sephatsi.

Sehlooho sena se akaretsa mekhoa ea ho laola crystallinity ea PTFE barbotage ka Teflon phahameng-thempereichara lesela. Taolo ea sekhahla sa ho pholisa e tobile ebile e sebetsa hantle: Pholiso e potlakileng (ho tima) ka likharetene tse batang tsa moea, lirolara kapa litanka tsa metsi - liketane tsa limolek'hule lia hoama pele li lokisoa, li etsa likristale tse nyane tse sa phethahalang; ho roala ho bonolo, ho thata ka ts'ebetso e ntlafalitsoeng ea ho se thupeng, ho fokotsehile hanyenyane ho thatafala / ho hanyetsa ho apara. Ho pholile butle (annealing) ka karolo ea ho boloka mocheso ho 10-50 ° C / h kapa pholileng ea sebōpi - liketane tsa limolek'hule li hlophisa ka botlalo li-spherulite tse kholo tse feletseng; ho roala ho na le boima bo phahameng, ho hanyetsa ho apara ka tsela e ikhethang, litekanyo tse tsitsitseng, ho fokotseha ha maemo le ho eketseha ha brittleness.

Sengoliloeng sena se akaretsa ts'ebeliso ea lesela la mocheso o phahameng oa Teflon ka har'a libopi tsa sintering tsa moea o chesang. Ho khoneha: e ka sebelisoa e le mosamo o se nang lithupa holim'a mabanta a letlooeng kapa literei ha mocheso oa sebōpi o ≤260 ° C (ho omisa mocheso o tlaase, ho tlosoa ha li-binder, ho phekola slurry) - ho ntlafatsa ho senya le ho khetha hantle. E thibetsoe ka thata ho mocheso o bohareng / o phahameng (300-950 ° C) - PTFE e bola e lokolla HF e chefo le perfluoroisobutylene, lisebelisoa tse senyang le ho baka chefo e bolaeang. Molao-motheo oa polokeho: haeba mocheso oa sebōpi o sa hlaka kapa o ke ke oa tiisetsoa ka tlase ho 260 ° C, u se ke oa o sebelisa. Lintho tsa motheo: tšebeletso e tsoelang pele -70 ° C ho 260 ° C, nako e khutšoanyane 300 ° C; ho se thupeng ho feteletseng le ho inertness ea lik'hemik'hale; e ntle ka ho fetisisa ea motlakase; khohlano e tlase (~ 0.04); fiberglass base e fana ka matla a phahameng a tensile.

Sengoliloeng sena se akaretsa lebelo le tloaelehileng la lebelo bakeng sa mohala oa tlhahiso ea lesela la Teflon le mocheso o phahameng oa mocheso. Mekhahlelo ea lebelo: lihlahisoa tse tšesaane tse tloaelehileng (0.08-0.30mm) ho 0.5-3 m / min, tse tsitsitseng ho 1-3 m / min; lihlahisoa tse teteaneng / tse ngata tse kenngoeng (≥0.4mm) ho 0.3-1 m / min; lithapo tse sebetsang hantle tse nang le lionto tse telele li ka fihla ho 3-6 m / min empa lisebelisoa tse hlokang. Litšitiso tsa ts'ebetso: ho omisa le ho senya ho hloka nako ea ho lula (PTFE e hloka 1-3 min ho 380-400 ° C; ho se lekaneng ho baka ho khomarela / ho phunyeha ho fokolang); lebelo le khethoa ke bonyane nako ea ho omisa / ea sintering tlas'a bolelele bo tsitsitseng ba ontong. Litšitiso tsa thepa: li-solids tse phahameng / viscosity dispersions li kenella butle; masela a teteaneng / a teteaneng a monya mokelikeli ebe o fetisa mocheso butle-butle; masela a sephara a tloaetseng ho fapana ka mebala e bohareng e hlokang ho fokotsa lebelo. Thepa le boleng ba khoebo: lionto tse telele tsa libaka tse ngata li lumella lebelo le holimo.

Sehlooho sena se akaretsa phapang pakeng tsa PTFE emulsion hlahisoang ke ho fanyeha polymerization vs dispersion polymerization. Tlhaloso: polymerization ea ho emisoa ha e khone ho hlahisa emulsion ea PTFE ka ho toba; emulsion ea 'nete ea PTFE e tsoa ho polymerization ea ho hasana. 'Suspension-method emulsion' ha e le hantle ke ho fanyeha ka metsi ha li-micropowder tsa resin tse entsoeng ka polymerized. Dispersion polymerization (primary emulsion): spherical particles (0.1-0.3μm, moqotetsane kabo), e tsitsitseng ke perfluorinated surfactants, phahameng ka ho fetisisa molek'hule boima (> 94% crystallinity), matla fibrillation, hloka 380 ° C sintering ho theha e tsoelang pele thata filimi.

Sengoliloeng sena se hlahloba tšusumetso ea mofuta oa li-catalyst tsa platinum le ho tsepamisa mohopolo ho crosslinking kinetics ea rabara ea silicone ea tlatsetso. Mefuta ea Catalyst: Speier catalyst (chloroplatinic acid, Pt⁴⁺) e hloka phokotso ho mefuta e sebetsang e tlaase, e sebetsang e le precatalyst; Karstedt catalyst (Pt⁰ e nang le divinyltetramethyldisiloxane) e kena ka ho toba potolohong ea catalytic. Litlamorao tsa mofuta: Speier e bonts'a nako ea induction e nang le sebopeho sa S-curing curve (e liehang pele, e potlakisa hamorao) le matla a holimo a bonahalang a ho kenya tšebetsong; Karstedt ha e bonts'e induction, sekhahla se phahameng sa pele se nang le exotherm e bohale, matla a tlase a ts'ebetso.