Lesi sihloko sihlanganisa ukusetshenziswa kwendwangu ye-Teflon high-temperature (indwangu ye-fiberglass eboshwe nge-PTFE) emkhakheni we-aerospace. Izindawo zesicelo esibalulekile: Ukukhiqizwa kwezinto ezihlanganisiwe - indwangu yokukhulula / ifilimu ekubunjweni kwe-autoclave, izendlalelo zokuhlukanisa, amabhande okuthutha asezingeni eliphezulu okukhiqizwa kwangaphambili; Injini kanye nokuvikelwa kokushisa okushisayo okuphezulu - izingubo zokuvala ezishisayo, i-firewall cladding, ukuxhumana okuguquguqukayo okunokushisa okuphezulu; Ukufakwa kukagesi nokuvikela izintambo zezintambo - ukusonga ikhebula emagumbini enjini kanye nezindawo zokumisa amagiya; Ingaphakathi lendiza kanye nokuvikela umlilo — amakhethini omlilo/izithiyo zentuthu ezihlangabezana nezindinganiso ze-FST, ukumbozwa kwengubo yokuvala okushisayo/okuzwakalayo; Izinhlelo zokusebenza ze-Space kanye ne-aerospace - ama-multi-layer insulation (MLI) ama-assemblies, ama-anti-cold-weld lubrication liner wezindlela zokuthunyelwa kwamaphaneli elanga namahinge e-antenna, indwangu yokulawula ukushisa.

Lesi sihloko sichaza ukuthi i-PTFE inamathela kanjani ku-fiberglass fabric substrate engutsheni ye-Teflon enezinga eliphezulu lokushisa. Ukuhlanganiswa kwamakhemikhali okuqondile akunakwenzeka ngenxa yamandla angaphezulu aphansi we-PTFE. Ukubophezela kufinyelelwa: Ukuxhumanisa ngomshini (ukubopha ngokomzimba) - I-emulsion ye-PTFE ingena ezikhaleni ze-fiber futhi ibambe izinyanda ze-fiber ngemva kokucwiliswa; I-Silane coupling agent pretreatment - yenza ibhuloho lamangqamuzana phakathi kwemicu yengilazi ye-inorganic kanye ne-organic primer; Isendlalelo se-Chemical primer transition layer — kusetshenziswa i-PAI, i-PPS, i-PES noma i-PEEK resins ene-PTFE micropowder, esetshenziswa ngemva kokuhlanganisa ukwelashwa ukuze kwakheke ungqimba oluqinile loguquko; I-hot-melt adhesive adhesive film lamination — Amafilimu e-FEP noma e-PFA (iphuzu elincibilikayo elingu-260-310°C) ahlanganisa amafilimu e-PTFE enziwe ngaphambilini endwangu; Isakhiwo segrediyenti ngemijikelezo yokufakwa okuningi kanye ne-sintering — nciphisa iphasi yokuqala nge-binder/coupling ingena ijule kumafayibha, ilandelwe ukufakwa okumsulwa kwe-PTFE, idala ukuhleleka kwegradient kusuka ku-fiberglass kuya ku-PTFE emsulwa.

Lesi sihloko sikhuluma ngendlela idizayini yesakhiwo esine-microporous ye-Teflon ephefumulayo (PTFE) yetheyiphu yokushisa ephezulu ebhalansisa ukungeneka komoya nge-insulation kanye nezakhiwo ezinganamathi. Ukungqubuzana okuyinhloko: ukungena komoya kudinga izimbotshana ezivulekile, kuyilapho ukwahlukanisa kudinga ukuminyana futhi okunganamathi kudinga izindawo ezibushelelezi. Amasu okuklama okulinganiselayo: lawula isilinganiso se-pore ububanzi (0.1-2μm, ngokufanelekile <0.5μm) ukuvimbela ukungena okuncibilika nokugcina i-voltage yokuphuka; lawula i-porosity ku-50-70% (≈60% ngokulungile) ukufeza i-Gurley 20-100s/100cc namandla e-dielectric ≥2kV yefilimu engu-0.13mm; sebenzisa ukwakheka kwezimbotshana zenethiwekhi ye-3D ene-tortuosity ephezulu (τ≈2.5-4) ukucindezela iziteshi zokuphuma eziqondile; ukwakha imbobo ye-asymmetric gradient pore enesendlalelo sesikhumba esiminyene (1-5μm) sokungeyona induku/i-insulation kanye nengaphakathi elinezimbotshana zokuphefumula; sebenzisa i-super-oleophobic/hydrophobic surface post-treatment ngaphandle kokuvaleka kwezimbotshana.

Lesi sihloko sethula izinzuzo zendwangu ye-PTFE yokushisa okuphezulu njengemidiya yesihlungi sezinga lokushisa eliphezulu. Amandla ayisihluthulelo ayisithupha: Ukumelana nokushisa okuvelele (okuqhubekayo okungu-260 ° C, ukuphakama ~ 300 ° C), okudlula i-PPS (190 ° C) ne-aramid (200 ° C); Ukungasebenzi kwamakhemikhali okwedlulele ngokumelene nama-asidi, ama-alkali, izinyibilikisi nama-oxidants, ukumelana ne-hydrolysis, i-aramid esebenza kahle kakhulu kanye ne-P84 kugesi eshisa izikhotha; Ukusebenza okuphezulu kokuhlanza uthuli okunamandla angaphezulu aphansi okwenza kube lula ukususa ikhekhe lothuli kanye nokwehla kwengcindezi ephansi; Ukusebenza kahle kokuhlunga ngosayizi wezimbotshana ezingu-0.1-3μm ezithatha ngaphezu kuka-99.99% wezinhlayiya ze-PM2.5; Ukungashi nge-LOI ngaphezu kwama-95%, kunezinketho zokulwa ne-static ezitholakalayo; Amandla okusebenza aphezulu avela ekuqinisweni kwe-fiberglass, enemidiya yefayibha ye-PTFE ehlanzekile enikeza ukuguquguquka kanye > nempilo yesevisi yeminyaka emi-4. Iqhathanisa kahle ne-PPS, i-aramid, i-Nomex, i-P84 kanye nemidiya yesihlungi se-fiberglass kuwo wonke amazinga okushisa, ukumelana namakhemikhali, ukumelana ne-hydrolysis kanye nokusebenza kokuhlanza.

Lesi sihloko sihlinzeka ngezixazululo ezihlelekile zokuvimbela izinsalela zokunamathela nokopha okunamathelayo uma usebenzisa i-PTFE itheyiphu yokushisa ephezulu ukuvikela iminwe yegolide ye-PCB ngesikhathi somhlangano we-SMT. Ukuhlaziywa kwembangela yezimpande: izinsalela zivela ekuhlulekeni okuhlangene noma ukudluliswa okuhlangene; ukopha kwenzeka ngenxa yokwehla kwe-viscosity kanye nokuchichima kokunamathela ngaphansi kokushisa okugelezayo. Isixazululo esiyinhloko ukukhetha itheyiphu efanele: i-silicone PSA enokuphakama kwesikhashana okungu-≥300°C, okuqhubekayo ≥260°C, ukujiya okuphelele okungu-0.08-0.13mm okunezendlalelo ezinamathelayo ezinamathelayo ezihlangene eziphezulu, nesitifiketi esivimbela ukopha/insalela. Ukulawula inqubo yezinyathelo eziyisithupha: ukuhlanzwa kwangaphambili kwe-lamination nge-IPA; I-lamination ye-zero-tension nge-air evacuation egcwele; iphrofayili yethempelesha elungiselelwe ukugeleza kabusha ngokufudumeza okuthambile (<2°C/s); ukuxebuka okubandayo ngaphansi kuka-50°C nge-engeli engu-180°; ukucubungula ngokushesha phakathi kwamahora angama-24 nokusetshenziswa kanye kuphela; ukuphatha ukwehluleka ngokusula kwe-IPA kanye nokuhlolwa kwesikhulisi esingu-40-50x. Kuma-PCB anezinhlangothi ezimbili, buyisela itheyiphu entsha ngaphambi kokucutshungulwa kohlangothi lwesibili.

Lesi sihloko sinikeza isiqondiso esihlelekile sokuvimbela imibimbi engutsheni ye-PTFE enezinga lokushisa eliphezulu ngesikhathi sokushisa. Imibimbi ibangelwa ngokuyisisekelo ukuncipha kokushisa okungalingani kanye nokucindezeleka okungaguquki. Izixazululo zihlanganisa ukugeleza komsebenzi okugcwele: ukulawulwa kwe-substrate yezinto ezingavuthiwe (ukukhishwa okuphelele kwe-dewaxing / ukushisa ukuze kuqedwe ukucindezeleka kwangaphakathi); ukukhulelwa nokomisa (izingubo ezincanyana eziningi, i-gradient yokushisa emnene, ama-drive rollers asebenzayo); isilawuli sesithando somlilo (i-1-3% i-overfeed yesibonelelo sokuncipha okushisayo, isilawuli se-micro-tension se-closed-loop, ukufana kwezinga lokushisa okuguquguqukayo phakathi kuka-±5°C, ijika lokupholisa le-gradient preheating-sintering-cooling, izithando zomoya ezintantayo njengesixazululo esilungile, amarola okusakaza agobile); ukupholisa nokusetha (ukupholisa kancane kancane, gcina ukusabalala kuze kube ngaphansi kuka-100°C, ukupholisa okugcwele ngaphambi kokusongwa); ukuqapha okuku-inthanethi ngokuhlola ukukhanya okuqinile nokuskena kwe-infrared.

Lesi sihloko sihlaziya ukuthi ukwelashwa kwe-sandblasting noma ukuqeda i-matt kusithinta kanjani isakhiwo esingaphezulu sendwangu ye-PTFE yezinga lokushisa eliphezulu. Ushintsho lwenzeka ngezinhlangothi ezintathu: I-Microscopic morphology ishintsha isuka ebushelelezi njengesibuko iye ekuthungeni kwe-gully emaholoholo ngamavelu akhuphuke ngokucijile e-Ra/Rz, idale izakhiwo zokunamathisela ze-3D zokuhlanganisa ukuze kuhlanganiswe okulandelayo. Ubuqotho bokwemboza bubhekene nezingozi: Ukuncipha kongqimba lwe-PTFE, ukuchayeka okungaba khona kwe-fiberglass substrate (okubangela ukulahleka kwempahla engagxili, ukungena komswakamo, namandla okusebenza ancishisiwe), kanye nama-microcracks kanye nokukhiqizwa kwemfucumfucu.

Lesi sihloko sethula inqubo eyisisekelo ephelele yokumithisa indwangu ye-fiberglass nge-emulsion ye-PTFE. Izinyathelo eziyisikhombisa eziyisihluthulelo: ① Ukwelashwa ngaphambi kwesikhathi (i-dewaxing/desizing) ku-350-400°C ukuze kukhishwe ama-ejenti wokulinganisa izindwangu; ② Ukwakhiwa kwe-emulsion enokuqukethwe okuqinile okungu-40-55% nama-surfactants ukuze kuthuthukiswe ukumanzisa; ③ Ukukhulelwa ngendlela yokucwilisa noma i-blade kadokotela; ④ Ukomisa ku-100-150°C ukuze uhwamulise amanzi kancane bese wenza ifilimu eyomile ye-PTFE; ⑤ Sintering at 360-390°C (kufika ku-400°C) ukuncibilikisa izinhlayiya ze-PTFE zibe ifilimu eqhubekayo; ⑥ I-Multi-cycle impregnation-drying-sintering ephindaphindwa izikhathi ezingu-2-4 ukuze kufinyelelwe ukujiya okuqondisiwe nokuqukethwe kwenhlaka (45-65%); ⑦ Ukwelashwa kwangemva kokwelashwa okuhlanganisa nokwelashwa kwe-corona, ukusikwa onqenqemeni, ukusonga kanye nokuhlolwa kwekhwalithi. Amaphuzu okulawula abalulekile: ukucwiliswa kwe-waxing okuphelele, ukumanzisa i-emulsion egcwele, ukomisa kancane kancane, izinga lokushisa elinembile le-sintering, kanye nokuminyana okunamathelayo okungaguquki. Imikhiqizo inikeza ama-laminates ane-copper-clad high-frequency, amabhande okuthutha asezingeni eliphezulu kanye nezinto zokwakha ze-membrane yezakhiwo.

Lesi sihloko sihlanganisa izinkomba zokusebenza eziwumgogodla ze-PTFE itheyiphu yezinga lokushisa eliphezulu esetshenziswa ku-vacuum coating, ukwelashwa kokushisa kwe-vacuum nezimo ezifanayo. Izidingo ezibalulekile zihluke kakhulu ekusetshenzisweni komkhathi: ukukhipha umoya kubaluleke kakhulu (TML≤1%, CVCM≤0.1%; amamaki e-aerospace/optical adinga i-TML≤0.5%, i-CVCM≤0.01%); ukumelana nezinga lokushisa kufanele kuqinisekiswe kukho kokubili i-PTFE substrate (260°C) kanye nongqimba olunamathelayo; I-PSA ye-silicone ehlanjululwe ngokukhethekile iyadingeka ukuvimbela ukungcoliswa kwe-siloxane; amandla okubamba izinga lokushisa eliphezulu avimbela ukukhasa nokuphakamisa unqenqema; ukuhlanzeka akudingi ukuchithwa kwe-fiber kanye nokuqukethwe kwe-ionic ephansi; i-anti-static tape (i-surface resistivity 10⁶-10⁹ Ω/sq) ivimbela ukulimala kwe-ESD; ukumelana kwe-plasma kufanele kuhlolwe izinqubo ze-sputtering/PECVD; ukuncipha okushisayo okungaphansi kuka-2% kuqinisekisa ukunemba kwemaski.

Lesi sihloko sethula izincibilikisi eziphilayo ezingamelana nendwangu ye-PTFE yezinga lokushisa eliphezulu. Indwangu ye-fiberglass ene-PTFE ibonisa ukungabi namandla kwamakhemikhali okukhethekile, imelana cishe nazo zonke izincibilikisi eziphilayo ezivamile ngaphansi kwezimo ezivamile zokusebenza ngaphandle kokuhlakazeka, ukuvuvukala noma ukusabela kwamakhemikhali. Izigaba ezibekezelelekayo zihlanganisa: utshwala (i-methanol, i-ethanol, i-isopropanol), i-ketone (i-acetone, i-MEK, i-cyclohexanone), i-esters (i-ethyl acetate, i-butyl acetate), ama-hydrocarbon (uphethiloli, i-toluene, i-xylene, i-hexane), i-halogenated hydrocarbons (i-dichloromethane, i-ether, i-ether). THF), ama-organic acid (glacial acetic acid, formic acid), ama-amine nama-amides (i-triethylamine, i-DMF), ama-phenols, namanye afana ne-carbon disulfide, i-pyridine, uwoyela we-silicone kanye ne-brake fluid.