Nkhaniyi ikukhudza ntchito Teflon mkulu-kutentha nsalu (PTFE TACHIMATA fiberglass nsalu) m'munda zamlengalenga. Magawo ofunikira: Kupanga zinthu zophatikizika - kutulutsa nsalu / filimu mu autoclave akamaumba, zigawo zodzipatula, malamba onyamula kutentha kwambiri kuti apange prepreg; Kutetezedwa kwa injini ndi kutentha kwapamwamba - zofunda zotchinjiriza kutentha, zotchingira zozimitsa moto, zolumikizira zosinthika kutentha kwambiri; Kutchinjiriza magetsi ndi chitetezo cha waya - kukulunga chingwe m'zipinda za injini ndi malo otsetsereka; Mkati mwa ndege ndi chitetezo cha moto - makatani amoto / zotchinga utsi zikukwaniritsa miyezo ya FST, zokutira zofunda zotenthetsera / zokuzira; Ntchito zapamlengalenga ndi zakuthambo - misonkhano yamitundu yosiyanasiyana (MLI), anti-cold-weld lubrication liners for solar panel deployment systems and antenna hinges, thermal control cloth.

Nkhaniyi ikufotokoza momwe PTFE zokutira zomangira kwa fiberglass nsalu gawo lapansi mu Teflon mkulu-kutentha nsalu. Direct mankhwala kugwirizana ndi zosatheka chifukwa PTFE a kopitilira muyeso-otsika pamwamba mphamvu. Kulumikizana kumatheka kudzera: Kulumikizana kwamakina (kulumikizana kwathupi) - PTFE emulsion imalowa mipata ya ulusi ndikugwira mitolo ya ulusi pambuyo pa sintering; Silane coupling agent pretreatment - amapanga molekyulu mlatho pakati pa organic glass fibers ndi organic primer; Chemical primer transition layer - pogwiritsa ntchito PAI, PPS, PES kapena PEEK resins yokhala ndi PTFE micropowder, yogwiritsidwa ntchito pambuyo pophatikizana chithandizo kuti apange wosanjikiza wosinthika; Hot-melt adhesive film lamination - FEP kapena PFA mafilimu (malo osungunuka 260-310 ° C) amangiriza mafilimu a PTFE opangidwa kale ndi nsalu; Kapangidwe ka gradient pogwiritsa ntchito kulowetsedwa kangapo ndi ma sintering cycles - kuchepetsa pass yoyamba ndi binder/coupling agent imalowa mkati mwa ulusi, kutsatiridwa ndi PTFE impregnations yoyera, kupanga gradient yochokera ku fiberglass kupita ku PTFE yoyera.

Nkhaniyi ikufotokoza momwe kamangidwe kake kakang'ono ka Teflon yopumira (PTFE) yotentha kwambiri imasinthira kutulutsa kwa mpweya ndi kutchinjiriza komanso zinthu zopanda ndodo. Mkangano wapakati: Kutha kwa mpweya kumafuna ma pores otseguka, pomwe kutchinjiriza kumafuna kachulukidwe komanso kusamata kumafuna malo osalala. Zolinga zopangira njira: kuwongolera m'mimba mwake (0.1-2μm, moyenera <0.5μm) kuteteza kusungunula kulowa ndikusunga voteji yowonongeka; kuwongolera porosity pa 50-70% (≈60% mulingo woyenera) kukwaniritsa Gurley 20-100s/100cc ndi mphamvu ya dielectric ≥2kV kwa filimu ya 0.13mm; kutengera mawonekedwe apamwamba a 3D network pore (τ≈2.5-4) kupondereza njira zowongoka; kumanga asymmetric gradient pore kapangidwe ndi wandiweyani pamwamba wosanjikiza khungu (1-5μm) kwa sanali ndodo / kusungunula ndi porous mkati kuti mpweya; gwiritsani ntchito super-oleophobic/hydrophobic surface post-treatment popanda pore blockage.

Nkhaniyi imapereka mayankho mwadongosolo popewa zotsalira zomatira ndi magazi omatira mukamagwiritsa ntchito tepi yotentha kwambiri ya PTFE kuteteza zala zagolide za PCB panthawi ya msonkhano wa SMT. Kusanthula kwazomwe zimayambitsa: zotsalira zimachitika chifukwa cholephera kugwirizanitsa kapena kusamutsa kwapakati; kukhetsa magazi kumachitika chifukwa cha kukhuthala kwa madontho ndi zomatira kusefukira pansi pa kutenthanso. Yankho lapakati ndiloyenera kusankha tepi: silikoni PSA yokhala ndi nsonga yaifupi ≥300 ° C, mosalekeza ≥260 ° C, makulidwe okwana 0.08-0.13mm okhala ndi zigawo zoonda kwambiri zomatira, ndi chiphaso chotsutsa magazi / chotsalira. Kuwongolera njira zisanu ndi chimodzi: kuyeretsa kusanachitike ndi IPA; zero-tension lamination ndi kutulutsa mpweya wonse; wokometsedwa reflow mbiri kutentha ndi kutentha pang'ono (<2°C/s); kuzizira kozizira pansi pa 50 ° C pa ngodya ya 180 °; kukonza mwachangu mkati mwa maola 24 ndikugwiritsa ntchito kamodzi kokha; kulephera kugwira ndi IPA kupukuta ndi 40-50x magnifier kuyendera. Kwa ma PCB a mbali ziwiri, sinthani ndi tepi yatsopano musanakonzenso mbali yachiwiri.

Nkhaniyi amapereka malangizo mwadongosolo kupewa makwinya pa PTFE mkulu kutentha nsalu pa sintering. Makwinya amayamba chifukwa cha kuchepa kwamafuta osagwirizana komanso kupsinjika kosagwirizana. Mayankho amaphimba mayendedwe athunthu: zopangira gawo lapansi kuwongolera (kutsitsa kwathunthu / kuyika kutentha kuti muchepetse kupsinjika kwamkati); kuyanika ndi kuyanika (zopaka zingapo zopyapyala, kutentha pang'ono, zodzigudubuza zoyendetsa); kuwongolera ng'anjo ya sintering (1-3% overfeed for thermal shrinkage allowance, shut-loop micro-tension control, transverse kutentha kutentha mkati mwa ± 5°C, gradient preheating-sintering-cooling curve, ng'anjo zoyandama mpweya monga njira yoyenera, zodzigudubuza zopindika); kuziziritsa ndi kuyika (kuzizira pang'onopang'ono, sungani kufalikira mpaka pansi pa 100 ° C, kuzizirira kwathunthu kusanapirire); kuwunika kwapaintaneti ndikuwunika mwamphamvu komanso kuwunika kwa infrared.

Nkhaniyi ikukhudza kuzirala zofunika pa PTFE mkulu-kutentha nsalu sintering. Pambuyo pa sintering pa 380-400 ° C, nsaluyo iyenera kudutsa mofulumira kudera la 310-315 ° C crystallization-sensitive zone. Kuzizira kovomerezeka ndi osachepera 30-50 ° C/mphindi (nsalu yopyapyala imatha kufikira 100-200 ° C/mphindi kudzera kuzizira kwa mpweya). Kuzizira kofulumira (kuzimitsa) kumatulutsa kuwala kocheperako (45-50%), kumapereka zokutira zofewa, zolimba zokhala ndi malo osalala, kumamatira mwamphamvu, kuchita bwino kwambiri kosamata, komanso kukana delamination ndi kusweka. Kuziziritsa pang'onopang'ono (kuzizira kwa ng'anjo) kumabweretsa kuwala kwakukulu (60-70%), kumapangitsa kuti zokutira zolimba, zowonongeka zomwe zimachepa, kusenda ndi microcracks.

Nkhaniyi ikufananiza kutentha kwa chipinda ndi kutentha kwapamwamba kwa zomatira zomata za PTFE za PTFE. Kutentha kwapamwamba (120-180 ° C) kumapanga maukonde ophatikizika okhala ndi mphamvu zolumikizana mwamphamvu, kuteteza zotsalira zomatira pambuyo pakusenda. Amapanga ma anchoring bond okhala ndi magawo a PTFE kudzera pa primer co-curing, kuchotsa ziwopsezo za delamination. Kutentha kwapamwamba kumachotsanso kusungunuka kwa mamolekyu musanayambe kubereka, kuteteza kuphulika ndi kuipitsidwa kwa mafuta a silicone pakuwotcha koyamba.

Bukuli limakhudza kusankha kwa tepi yotentha kwambiri ya PTFE pakumangira jekeseni ndi ntchito zotsutsana ndi ndodo. Kusankha kotengera kutentha: ≤260 ° C kwa pulasitiki wamba (standard silicone PSA tepi, 0.13-0.18mm); 260-300 ° C kwa mapulasitiki opangira kutentha kwambiri monga PC, PA66, POM (zomatira za silicone zapamwamba, 0.18-0.25mm); 300-400 ° C ya PEEK, LCP, PPS pafupi ndi othamanga otentha (tepi yomatira imalephera; gwiritsani ntchito nsalu ya PTFE yopanda zomatira kapena filimu ya PFA). Kusankhidwa kozikidwa pazida: zida zokhotakhota zimafunikira mawonekedwe omasuka a PTFE; galasi/mineral zodzazidwa ndi zinthu zimafuna katundu wolemera 0.25mm+ kuvala zosagwira tepi; zowonjezera zowononga zimafuna zomatira zosagwirizana ndi mankhwala ndi gawo lapansi lowundana; ma static-sensitive application amafunikira anti-static black PTFE tepi.

Nsalu yotentha kwambiri ya PTFE imapangidwa ndi kupaka PTFE pansalu yamphamvu kwambiri ya fiberglass, yomwe imapereka mphamvu zolimba, kukana kutentha, katundu wosagwira ndodo, kukana mankhwala, komanso kugundana kochepa. Ntchito zazikuluzikulu zikuphatikiza: kutumizira mafakitale (kutengera kutentha, kuphika chakudya, zowumitsa nsalu, kuyanika mapepala / filimu); nsalu zomangira zophatikizika komanso zomangira zomangira zotentha; kuwotcherera makatani oteteza ndi ma jekete oteteza kutentha; magetsi galimoto ndi thiransifoma kutchinjiriza; kumanga zitsulo zotsetsereka ndi zothandizira mapaipi; kusefera kwa mankhwala ndi kusindikiza ma valve m'malo owononga. Kulimba kwamphamvu kwamphamvu kumatsimikizira kulimba pansi pa kupsinjika, kung'ambika, kusinthasintha mobwerezabwereza, komanso kupsinjika kwamakina kwapamwamba pamakina osiyanasiyana olemetsa.

Pa sintering, PTFE particles pa fiberglass nsalu kusungunuka pamwamba 327 ° C, kuwononga choyambirira apangidwe-unyolo lamellae ndi tinthu malire kupanga amorphous kusungunuka. Ikazizira, PTFE imakhazikikanso kukhala ma spherulites opangidwa ndi ma radially oriented lamellae, okhala ndi crystallinity kuyambira 50-70%. Kuzizira kumatsimikizira ungwiro wa kristalo: kuzizira pang'onopang'ono kumapereka crystallinity yapamwamba, ma spherulites akuluakulu, kuuma kwakukulu; kuzimitsa mwachangu kumapereka ma spherulites abwino komanso kusinthasintha bwino.