Sengoliloeng sena se akaretsa lits'ebetso tsa lesela la mocheso o phahameng oa Teflon (PTFE-coated fiberglass fabric) lebaleng la sefofane. Libaka tse ka sehloohong tsa ts'ebeliso: Ho etsa thepa e entsoeng ka motsoako - ho lokolla lesela / filimi ka ho bopa ha autoclave, likarolo tsa ho itšehla thajana, mabanta a mocheso o phahameng oa mocheso bakeng sa tlhahiso ea prepreg; Tšireletso ea mocheso oa enjene le mocheso o phahameng - likobo tse thibelang mocheso, li-firewall cladding, lihokelo tse feto-fetohang tsa mocheso o phahameng; Tšireletso ea motlakase le ts'ireletso ea lithapo - ho phuthela ha cable ka likampong tsa enjene le libaka tsa lisebelisoa tsa ho lulisa; Bokahare ba lifofane le tšireletso ea mollo - likharetene tsa mollo / litšitiso tsa mosi tse finyellang litekanyetso tsa FST, ho roala kobo ea ho futhumatsa mocheso / acoustic; Lisebelisoa tsa sebaka le sepakapaka - likopano tse nang le li-multi-layer insulation (MLI), li-anti-cold-weld lubrication liner bakeng sa mekhoa ea ho tsamaisa lisebelisoa tsa letsatsi le li-antenna, lesela la ho laola mocheso.

Sengoliloeng sena se hlalosa hore na PTFE e tlama joang ho substrate ea lesela la fiberglass ka lesela la mocheso o phahameng oa Teflon. Ho kopanya lik'hemik'hale ka kotloloho ha ho khonehe ka lebaka la matla a holimo a tlase a PTFE. Ho kopanya ho finyelloa ka: Mechanical interlocking ('mele tlamahano) - PTFE emulsion phunyeletse likheo faeba le ho tšoara likhoele tsa fiber ka mor'a hore sintering; Silane coupling agent pretreatment - e theha borokho ba limolek'hule lipakeng tsa likhoele tsa khalase tse sa tsitsang le organic primer; Lik'hemik'hale primer transition layer - ho sebelisa li-resin tsa PAI, PPS, PES kapa PEEK tse nang le PTFE micropowder, tse sebelisoang ka mor'a ho kopanya phekolo ho theha lera le matla la phetoho; Lamination ea filimi e khomarelang e chesang e chesang - FEP kapa PFA lifilimi (ntlha e qhibilihisang 260-310 ° C) e kopanya lifilimi tsa PTFE tse entsoeng pele ho lesela; Sebopeho sa gradient ka li-multiple impregnation le sintering cycles - hlapolla pase ea pele e nang le se tlamang / se kopanyang e kenella ka hare ho likhoele, e lateloe ke ho kenngoa ha PTFE, ho theha sebopeho sa gradient ho tloha fiberglass ho ea PTFE e hloekileng.

Sengoliloeng sena se bua ka mokhoa oo moralo oa sebopeho sa microporous oa Teflon e phefumolohang (PTFE) e nang le mocheso o phahameng oa mocheso o lekanyang ho kenella ha moea ka ho kenella le thepa e sa tsitsang. Khohlano ea mantlha: ho kenella ha moea ho hloka li-pores tse bulehileng, athe ho kenella ka hare ho hloka hore ho be le ho teteana le ho se thupa ho hloka libaka tse boreleli. Mekhoa e leka-lekaneng ea moralo: ho laola bophara ba pore ka karolelano (0.1-2μm, hantle <0.5μm) ho thibela ho kenella ha qhibiliha le ho boloka matla a ho senya; laola porosity ho 50-70% (≈60% optimal) ho finyella Gurley 20-100s / 100cc le matla a dielectric ≥2kV bakeng sa filimi ea 0.13mm; amohela sebopeho sa pore sa marang-rang sa 3D se phahameng sa tortuosity (τ≈2.5-4) ho hatella likanale tse otlolohileng tsa ho lahla; haha ​​pore asymmetric gradient pore le lera le teteaneng la holim'a letlalo (1-5μm) bakeng sa ho se thunye / insulation le hare-hare bakeng sa ho phefumoloha; sebelisa super-oleophobic/hydrophobic surface post-therapy ntle le ho thibela pore.

Sehlooho sena se fana ka litharollo tse hlophisitsoeng bakeng sa ho thibela masala a sekhomaretsi le ho tsoa mali ka sekhomaretsi ha u sebelisa tepi ea mocheso o phahameng oa PTFE ho sireletsa menoana ea khauta ea PCB nakong ea kopano ea SMT. Tlhahlobo ea sesosa sa motso: masalla a hlaha ka lebaka la ho hlōleha ho kopane kapa ho fetisoa ha sefahleho; ho tsoa mali ho hlaha ka lebaka la ho theoha ha viscosity le sekhomaretsi se phallang tlas'a mocheso oa reflow. Tharollo ea mantlha ke khetho e nepahetseng ea theipi: silicone PSA e nang le tlhōrō ea nako e khutšoanyane ≥300 ° C, e tsoelang pele ≥260 ° C, botenya bohle ba 0.08-0.13mm e nang le likarolo tse tšesaane tse khomarelang holimo, le setifikeiti se khahlanong le ho tsoa mali / masala. Taolo ea mehato e tšeletseng: ho hloekisa pele ho lamination ka IPA; lamination ea zero-tension e nang le phallo e feletseng ea moea; boemo bo ntlafalitsoeng ba mocheso oa phalliso ka ho futhumatsa ha bonolo (<2°C/s); ho ebola ho batang ka tlase ho 50 ° C ka lehlakoreng la 180 °; ts'ebetso ea hang-hang nakong ea lihora tse 24 le tšebeliso e le 'ngoe feela; ho hloleha ho sebetsana le ho hlakola IPA le tlhahlobo ea magnifier ea 40-50x. Bakeng sa li-PCB tse mahlakoreng a mabeli, nkela sebaka ka theipi e ncha pele e sebetsa ka lehlakoreng la bobeli.

Sehlooho sena se fana ka tataiso e hlophisitsoeng mabapi le ho thibela wrinkles ka PTFE phahameng-thempereichara lesela nakong sintering. Wrinkles ha e le hantle e bakoa ke ho fokotseha ho sa lekaneng ha mocheso le khatello ea maikutlo e sa tsitsang. Litharollo li koahela ts'ebetso e feletseng ea mosebetsi: taolo ea substrate e tala (e feletseng ea dewaxing / mocheso oa mocheso ho felisa khatello ea kelello ea ka hare); ho kenya le ho omisa (liaparo tse ngata tse tšesaane, mocheso o bonolo oa mocheso, li-roller tse sebetsang ka thata); taolo ea sebōpi sa sintering (1-3% e fetelletseng bakeng sa tumello ea ho fokotseha ha mocheso, taolo ea micro-tension e koetsoeng, ho feto-fetoha ha mocheso ka har'a ± 5 ° C, curve ea preheating-sintering-cooling curve, libopi tsa moea e le tharollo e nepahetseng, li-rollers tse kobehileng); ho pholisa le ho beha (ho pholisa butle butle, boloka ho hasana ho fihlela ka tlase ho 100 ° C, ho pholile ka ho feletseng pele ho tsoelipana); ho lekola marang-rang ka tlhahlobo e matla ea leseli le ho sekena ha infrared.

Sengoliloeng sena se akaretsa litlhoko tsa sekhahla sa ho pholisa nakong ea PTFE ea mocheso o phahameng oa mocheso oa lesela. Kamora ho chesa ka 380-400 ° C, lesela le tlameha ho feta ka potlako sebakeng sa 310-315 ° C sa crystallization-sensitive zone. Sekhahla sa ho pholisa se khothalelitsoeng ke bonyane 30-50 ° C / min (lesela le lesesaane le ka fihlela 100-200 ° C / min ka moea o pholileng). Ho pholile ka potlako (ho tima) ho hlahisa crystallinity e tlaase (45-50%), ho fana ka liphahlo tse bonolo, tse thata tse nang le libaka tse boreleli, ho khomarela ka matla, ts'ebetso e babatsehang e sa tsitsang, le ho hanyetsa delamination le ho phunyeha. Ho pholile butle (ho pholile ha sebōpi) ho fella ka crystallinity e phahameng (60-70%), e bakang liphahlo tse thata, tse brittle tse atisang ho fokotseha, ho peeling le microcracks.

Sehlooho sena se bapisa mocheso oa kamore le mocheso o phahameng oa sekhomaretsi se nang le khatello ea silicone bakeng sa tepi ea PTFE. Boemo bo phahameng ba mocheso (120-180 ° C) bo etsa marang-rang a teteaneng a kopantsoeng a nang le matla a matla a ho kopanngoa, a thibela masala a sekhomaretsi ka mor'a ho ebola. E theha litlamo tsa lik'hemik'hale tse nang le lik'hemik'hale tse nang le li-substrates tsa PTFE ka primer co-curing, ho felisa likotsi tsa delamination. Ho hōla ha mocheso o phahameng ho boetse ho tlosa likhahla tse tlaase tsa molek'hule pele ho tsoaloa, ho thibela ho phatloha le ho silafala ha oli ea silicone nakong ea ho futhumatsa ha pele.

Tataiso ena e akaretsa khetho ea theipi ea mocheso o phahameng oa PTFE bakeng sa ho bopa ente le lits'ebetso tse khahlanong le lithupa. Khetho e thehiloeng mocheso: ≤260 ° C bakeng sa polasetiki e tloaelehileng (tape e tloaelehileng ea silicone PSA, 0.13-0.18mm); 260-300 ° C bakeng sa li-plastiki tsa boenjiniere tse phahameng tsa mocheso joaloka PC, PA66, POM (sekhomaretsi sa silicone se phahameng, 0.18-0.25mm); 300-400 ° C bakeng sa PEEK, LCP, PPS haufi le limathi tse chesang (theipi e khomarelang e hlōleha; sebelisa lesela la PTFE le se nang sekhomaretsi kapa filimi ea PFA). Khetho e thehiloeng ho lintho tse bonahalang: lisebelisoa tsa tacky li hloka libaka tse phahameng tsa PTFE tse hloekileng; lisebelisoa tse tlatsitsoeng ka khalase / liminerale li hloka tepi e sa sebetseng ea boima ba 0.25mm +; li-additives tse senyang li hloka sekhomaretsi se hanyetsanang le lik'hemik'hale le substrate e teteaneng; static-sensitive applications hloka anti-static black PTFE theipi.

Lesela le nang le mocheso o phahameng oa PTFE le entsoe ka ho roala PTFE holim'a lesela la fiberglass e matla haholo, le fanang ka matla a tsitsitseng, ho hanyetsa mocheso, thepa e sa tsitsang, lik'hemik'hale tse hanyetsanang le likhohlano tse fokolang. Lisebelisoa tsa bohlokoa li kenyelletsa: ho tsamaisa liindasteri (ho paka ho fokotsa mocheso, ho baka lijo, li omisa masela, ho omisa pampiri / lifilimi); lesela la ho lokolla le entsoeng ka motsoako le li-cushion liner tse chesang; tjheseletsa likharetene tse sireletsang le libaki tsa ho futhumatsa mocheso; motlakase oa motlakase le motlakase oa motlakase; ho haha ​​li-bearings tse thellang le litšehetso tsa lipeipi; ho sefa lik'hemik'hale le ho koala li-valve libakeng tse senyang. Matla a matla a phahameng a tiisa ho tšoarella tlas'a tsitsipano, ho taboha, ho feto-fetoha khafetsa, le khatello ea mocheso e phahameng ea mocheso ho pholletsa le mefuta ena e fapaneng ea mesebetsi e boima.

Nakong ea sintering, likaroloana tsa PTFE holim'a lesela la fiberglass le qhibiliha ka holimo ho 327 ° C, li senya lamellae ea pele e phuthoang le likaroloana ho etsa hore ho be le ho qhibiliha ha amorphous. Ka mor'a ho pholile, PTFE e tsosolosa li-spherulites tse entsoeng ka lamellae e nang le mahlaseli a maholo, a nang le crystallinity ho tloha 50-70%. Sekhahla sa ho pholisa se etsa qeto ea phetheho ea kristale: ho pholisa butle ho fana ka kristale e phahameng, li-spherulite tse kholoanyane, boima bo boholo; ho tima ka potlako ho fana ka li-spherulite tse ntle le ho feto-fetoha ha maemo.