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.

Lesi sihloko sifaka izidingo zesilinganiso sokupholisa ngesikhathi se-PTFE i-high-temperature sintering cloth. Ngemva kokucwilisa ku-380-400 ° C, indwangu kufanele idlule ngokushesha endaweni ezwela icrystallization engu-310-315°C. Izinga lokupholisa elinconyiwe okungenani lingu-30-50°C/min (indwangu encane ingafinyelela ku-100-200°C/min ngokupholisa umoya). Ukupholisa okusheshayo (ukucisha) kukhiqiza ubucwebe obuphansi (45-50%), bukhipha izimbotshana ezithambile, eziqinile ezinezindawo ezibushelelezi, ukunamathela okuqinile, ukusebenza okuhle kakhulu okungamanti, nokumelana ne-delamination nokuqhekeka. Ukupholisa kancane (ukupholisa kwesithando somlilo) kubangela ukucwebezela okuphezulu (60-70%), okubangela ukunamathela okuqinile, okubolayo okujwayele ukushwabana, ukuxebuka kanye nama-microcracks.

Lesi sihloko siqhathanisa izinga lokushisa legumbi kanye nokuvuthwa kwezinga lokushisa eliphezulu kwe-adhesive ezwela ukucindezela kwe-silicone ye-PTFE tape. Ukuvuthwa kwezinga lokushisa eliphezulu (120-180°C) kudala amanethiwekhi aminyene axhumene anamandla okuhlangana aqinile, okuvimbela insalela enamathelayo ngemva kokuxebuka. Yakha amabhondi okunamathisela amakhemikhali anezingxenye ezingaphansi ze-PTFE ngokusebenzisa i-primer co-curing, eqeda ubungozi be-delamination. Ukuvuthwa kwezinga lokushisa eliphezulu futhi kususa ukuguquguquka kwamangqamuzana aphansi ngaphambi kokubeletha, kuvimbela ukubhamuza nokungcoliswa kukawoyela we-silicone ngesikhathi sokushisisa kokuqala.

Lo mhlahlandlela uhlanganisa ukukhethwa kwetheyiphu ye-PTFE yokushisa okuphezulu yokubumba umjovo wokubumba kanye nezinhlelo zokusebenza zokulwa nezinti. Ukukhetha okusekelwe emazingeni okushisa: ≤260 ° C kumapulasitiki ajwayelekile (i-tape evamile ye-silicone ye-PSA, 0.13-0.18mm); I-260-300 ° C yepulasitiki yobunjiniyela bezinga eliphezulu lokushisa njenge-PC, i-PA66, i-POM (i-adhesive ye-silicone yezinga eliphezulu, i-0.18-0.25mm); 300-400°C ye-PEEK, LCP, PPS eduze nabagijimi abashisayo (itheyiphu yokunamathisela iyehluleka; sebenzisa indwangu ye-PTFE enganamatheli noma ifilimu ye-PFA). Ukukhetha okusekelwe ezintweni ezibonakalayo: izinto ezicashile zidinga ukukhishwa okuphezulu okuhlanzekile kwe-PTFE; izinto ezigcwele ingilazi/amaminerali zidinga itheyiphu engagugi engu-0.25mm+; izithasiselo ezonakalisayo zidinga ingcina ekwazi ukumelana namakhemikhali kanye ne-substrate eminyene; izinhlelo zokusebenza ezizwela i-static zidinga itheyiphu ye-PTFE ephikisana ne-static.

Indwangu yokushisa ephezulu ye-PTFE yenziwa ngokunamathisela i-PTFE phezu kwendwangu ye-fiberglass enamandla amakhulu, enikeza amandla aqinile, ukumelana nokushisa, izakhiwo ezingabambeki, ukumelana namakhemikhali, nokungqubuzana okuphansi. Izicelo ezimqoka zihlanganisa: ukuthunyelwa kwezimboni (ukupakishwa kokunciphisa ukushisa, ukubhaka ukudla, okomisa izindwangu, ukomisa amaphepha/ifilimu); indwangu yokubumba ehlanganisiwe kanye nama-cushion liners ashisayo; amakhethini okuvikela amakhethini kanye namajakhethi okushisa ashisayo; motor kagesi kanye transformer insulation; ukwakha ama-sliding bearings nezisekelo zamapayipi; ukuhlunga kwamakhemikhali kanye nokuvala ama-valve ezindaweni ezigqwalile. Amandla aqine kakhulu aqinisekisa ukuqina ngaphansi kwengcindezi, ukudabuka, ukuguquguquka okuphindaphindiwe, kanye nengcindezi yemishini yezinga eliphezulu lokushisa kuzo zonke lezi zinhlelo zokusebenza ezisindayo ezihlukahlukene.

Ngesikhathi sokucwiliswa, izinhlayiya ze-PTFE endwangu ye-fiberglass zincibilika ngaphezu kuka-327°C, zicekela phansi i-lamellae egoqiwe yoqobo kanye nemingcele yezinhlayiyana ukuze zakhe ukuncibilika kwe-amorphous. Lapho ipholisa, i-PTFE iphinda icwebe ibe ngama-spherulites akhiwe ama-lamellae anama-radially, anobukristalu obusukela ku-50–70%. Izinga lokupholisa linquma ukuphelela kwekristalu: ukupholisa kancane kukhiqiza icrystallinity ephakeme, ama-spherulite amakhulu, ubulukhuni obukhulu; ukucisha ngokushesha kunikeza ama-spherulites amahle kanye nokuguquguquka okuthuthukisiwe.

Indwangu yokushisa ephezulu ye-PTFE ephefumula kakhulu ihlanganisa izakhiwo ezinganamatheli, ukuzinza okushisayo, nokungena komoya. Lesi sihloko sihlola ukusetshenziswa kwayo okubalulekile ekomisweni kwendwangu, ukucubungula ukudla, ukukhiqiza okuyinhlanganisela, izinto zikagesi, ukuthutha umoya, ukuvikelwa kwemvelo, nezinto zokwakha.

Lesi sihloko sichaza ukuthi kungani indwangu ye-fiberglass engena-alkali iyisisekelo esincanyelwayo sendwangu ye-PTFE enezinga lokushisa eliphezulu. Ihlanganisa ukubopha kwamakhemikhali ngama-ejenti ahlanganisayo we-silane kanye nezakhiwo ezibalulekile zomzimba njengokuzinza kwe-thermal, ukuzinza kwe-dimensional, nokumelana nokugqwala - iqinisekisa ukusebenza okuhlala isikhathi eside ezindaweni ezinokhahlo.

Njengomkhiqizi ochwepheshe wendwangu ye-PTFE eshisa kakhulu, i-Jiangsu Aokai New Materials ikuthatha ukuze ufunde kabanzi. Ezimweni eziningi, iglue eselashiwe kanye ne-resin kungacwecwa ngokuphelele engutsheni yezinga lokushisa eliphezulu ye-PTFE cishe kungabikho nsali esele. Nokho, lo mphumela awuphelele. Okwangempela