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 bua ka mokhoa oa ho tsamaisana le lebelo la mochini oa ho roala le bolelele ba ontong ho netefatsa hore sekhomaretsi sa organosilicone se fihlella tekanyo ea pheko bakeng sa tepi ea PTFE e phahameng ea mocheso. Molao-motheo o tsamaisanang le oona: kakaretso ea nako ea bolulo t_total = bolelele ba onto bo sebetsang L ÷ lebelo la mola v e tlameha ho ba nako e fokolang e hlokahalang ea pheko. Fumana litšoaneleho tsa pheko ka DSC kapa liteko tsa sekhomaretsi tse thehang kamano ea 'mocheso - bonyane ba nako ea pheko'. Moetso o lekanang oa pheko: arola onto ka libaka, bala ti=Li/v le tcure(Ti), netefatsa ∑(ti/tcure(Ti)) ≥1. Mekhoa ea ho bala: beha libaka tsa mocheso tse nang le bolelele ba Li le mocheso Ti; seta lebelo la mola v, bala nako ea sebaka se seng le se seng sa bolulo le karolelano ea monehelo; pheta ho fihlela kakaretso ≥1 (tšireletseho margin 1.1-1.2 kgothaletswa).

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 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 bapisa liphapang lipakeng tsa ho futhumala ha mahlaseli a infrared le mekhoa ea pheko ea ho futhumatsa moea o chesang ka mokhoa o ts'oanang oa sebopeho sa sekhomaretsi sa silicone. Mekhoa ea ho fetisa mocheso: moea o chesang o itšetlehile ka convection-conduction ka ho phahama ha mocheso o bonolo, phapang e nyenyane ea mocheso ka hare / ka ntle; IR e na le botebo bo fokolang ba ho kenella ka ho monya ka matla holim'a metsi (li-micrometer tse mashome ho isa ho tse makholo) tse etsang moepa o moepa ho tloha holimo ho ea ka hare. Liphello tsa ho tšoana ha crosslink: moea o chesang o thusa ho phekola ka hare le ka ntle ka mokhoa o ts'oanang oa crosslink density; IR e etsa hore bokaholimo bo thehe 'filimi ea letlalo' e teteaneng ka potlako e sitisang ho tsamaisa mocheso le ho sisinyeha ha ketane ea ka hare, e leng se etsang hore sekhahla sa marang-rang se fokotsehe ho tloha holimo ho ea kahare.

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 phokotso ea 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.