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 ikupereka ubwino PTFE mkulu-kutentha nsalu monga mkulu-kutentha fyuluta TV. Mphamvu zisanu ndi chimodzi zazikulu: Kukana kutentha kwapadera (kupitirira 260 ° C, nsonga ~ 300 ° C), kupitirira PPS (190 ° C) ndi aramid (200 ° C); Kusagwira bwino kwa mankhwala motsutsana ndi zidulo, ma alkali, zosungunulira ndi ma okosijeni, zosagwira hydrolysis, aramid osachita bwino ndi P84 mu mpweya wowononga wa flue; Kuchita bwino kwambiri koyeretsa fumbi ndi mphamvu zotsika kwambiri zomwe zimapangitsa kuti fumbi lichotseke mosavuta komanso kutsika kwapang'onopang'ono; Kuchita bwino kwambiri kusefera ndi kukula kwa pore 0.1-3μm kumagwira 99.99% ya tinthu ta PM2.5; Kusawotcha ndi LOI pamwamba pa 95%, ndi zosankha zotsutsana ndi static zomwe zilipo; Mphamvu zamakina apamwamba kuchokera ku kulimbikitsa magalasi a fiberglass, okhala ndi PTFE fiber media yoyera yomwe imapereka kusinthasintha ndi> moyo wautumiki wazaka 4. Yerekezerani bwino ndi PPS, aramid, Nomex, P84 ndi fiberglass zosefera pa kutentha, kukana kwa mankhwala, kukana kwa hydrolysis ndi ntchito yoyeretsa.

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 kutentha mbiri 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 ntchito ndi IPA kupukuta ndi kuwunika kwa 40-50x magnifier. 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 ikuwunika momwe sandblasting kapena matt kumaliza chithandizo kumakhudzira mawonekedwe a pamwamba pa nsalu ya PTFE yotentha kwambiri. Zosintha zimachitika m'magawo atatu: Microscopic morphology imasintha kuchoka pagalasi losalala mpaka mawonekedwe owoneka bwino okhala ndi ma Ra/Rz okwera kwambiri, ndikupanga zomangira za 3D zomangirirana. Kupaka umphumphu kumakumana ndi zoopsa: PTFE kupatulira kosanjikiza, kuwonekera kwa fiberglass gawo lapansi (kuyambitsa kutayika kwa katundu wopanda ndodo, kulowa kwa chinyezi, ndi kuchepa mphamvu zamakina), kuphatikiza ma microcracks ndi zinyalala.

Nkhaniyi ikufotokoza njira zonse zofunika zopangira nsalu za fiberglass ndi PTFE emulsion. Masitepe asanu ndi awiri ofunika: ① Pretreatment (dewaxing/desizing) pa 350-400°C kuchotsa zinthu zoyezera nsalu; ② Mapangidwe a emulsion okhala ndi 40-55% olimba komanso zowonjezera zowonjezera pakunyowetsa bwino; ③ Kulowetsedwa kudzera mu njira yofinya kapena zokutira tsamba la dokotala; ④ Kuyanika pa 100-150 ° C kuti musungunuke madzi pang'onopang'ono ndikupanga filimu yowuma ya PTFE; ⑤ Sintering pa 360-390 ° C (mpaka 400 ° C) kusungunula particles PTFE mu filimu mosalekeza; ⑥ Mipikisano mkombero impregnation-kuyanika-sintering mobwerezabwereza 2-4 nthawi kukwaniritsa chandamale makulidwe ndi utomoni okhutira (45-65%); ⑦ Kuchiza pambuyo pochiza kuphatikizirapo kuchiza kwa corona, kudula m'mphepete, kutsekereza ndi kuyang'ana bwino. Kore ulamuliro mfundo: dewaxing wathunthu, zonse emulsion wetting, pang'onopang'ono kuyanika, yeniyeni sintering kutentha, ndi kusasinthasintha ❖ kuyanika kachulukidwe. Zogulitsa zimagwiritsa ntchito ma laminates okhala ndi mkuwa wokwera kwambiri, malamba onyamula kutentha kwambiri komanso zida zomanga.

Nkhaniyi ikukhudzana ndi zizindikiro zazikulu za PTFE tepi yotentha kwambiri yomwe imagwiritsidwa ntchito popaka vacuum, chithandizo cha kutentha kwa vacuum ndi malo ofanana. Zofunikira zazikulu zimasiyana kwambiri ndi kugwiritsa ntchito mlengalenga: kutulutsa mpweya ndikovuta kwambiri (TML≤1%, CVCM≤0.1%; magalasi owuluka mumlengalenga / owonera amafuna TML≤0.5%, CVCM≤0.01%); kukana kutentha kuyenera kutsimikiziridwa pa gawo lapansi la PTFE (260 ° C) ndi wosanjikiza zomatira; Siloxane PSA yoyeretsedwa mwapadera imafunikira kuti mupewe kuipitsidwa kwa siloxane; Kutentha kwakukulu kumalepheretsa kukwawa ndi kukweza m'mphepete; ukhondo sumafuna kukhetsa kwa ulusi komanso kutsika kwa ayoni; tepi yotsutsa-static (resistivity pamwamba 10⁶-10⁹ Ω/sq) imalepheretsa kuwonongeka kwa ESD; kukana kwa plasma kuyenera kuwunikidwa panjira za sputtering/PECVD; Kutsika kwamafuta pansi pa 2% kumatsimikizira kubisala bwino.

Nkhaniyi ikuwonetsa zosungunulira za organic zomwe nsalu ya PTFE yotentha kwambiri imatha kupirira. Nsalu ya PTFE-yokutidwa ndi fiberglass imawonetsa kusakhazikika kwapadera kwamankhwala, kukana pafupifupi zosungunulira zonse wamba pansi pamikhalidwe yabwinobwino yogwirira ntchito popanda kusungunuka, kutupa kapena kuchitapo kanthu kwamankhwala. Magulu olekerera akuphatikizapo: mowa (methanol, ethanol, isopropanol), ketoni (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), ma hydrocarbons (petulo, toluene, xylene, hexane), halogenated hydrocarbons (dichloromethylene), carbon dioxide, ether THF), ma organic acid (glacial acetic acid, formic acid), amines ndi amides (triethylamine, DMF), phenols, ndi ena monga carbon disulfide, pyridine, silikoni mafuta ndi brake fluid.