Eli nqaku libandakanya ukusetyenziswa kwelaphu le-Teflon lobushushu obuphezulu (ilaphu le-fiberglass efakwe kwi-PTFE) kwindawo ye-aerospace. Imimandla ephambili yesicelo: Ukuveliswa kwezinto ezidibeneyo - i-cloth yokukhupha / ifilimu kwi-autoclave molding, iileyile zokuzihlukanisa, amabhanti okuhambisa amaqondo aphezulu okushisa kwimveliso ye-prepreg; Injini kunye nobushushu obuphezulu bokukhuselwa kwe-thermal - iingubo zokugquma i-thermal, i-firewall cladding, i-flexible high-temperature connections; Ukugquma kombane kunye nokukhuselwa kweentambo zocingo - ukuvala intambo kwiikhompathi ze-injini kunye neendawo zokumisa izixhobo; Ingaphakathi leenqwelo-moya kunye nokhuseleko lomlilo — iikhethini zomlilo/imiqobo yomsi ehlangabezana nemigangatho ye-FST, i-thermal/acoustic insulation blanket blanket; Izicelo ze-Space kunye ne-aerospace - ii-multi-layer insulation (MLI) iindibano, i-anti-cold-weld lubrication liners ye-solar panel deployment mechanisms kunye ne-antenna hinges, ilaphu lokulawula i-thermal.

Eli nqaku licacisa indlela i-PTFE yokwambathisa iibhondi kwilaphu le-fiberglass substrate kwilaphu leTeflon elinobushushu obuphezulu. Ukudityaniswa kweekhemikhali ngokuthe ngqo akunakwenzeka ngenxa ye-PTFE's ultra-low surface energy. Ukudibanisa kufezekiswa ngoku: Ukudibanisa komatshini (ukudibanisa ngokomzimba) - i-emulsion ye-PTFE ingena kwi-fiber gaps kwaye ibambe i-fiber bundles emva kokucoca; I-Silane coupling agent pretreatment - yenza ibhulorho yemolekyuli phakathi kweefiber zeglasi ezingaphiliyo kunye ne-organic primer; I-Chemical primer transition layer - usebenzisa i-PAI, i-PPS, i-PES okanye i-PEEK i-resin ene-PTFE micropowder, isetyenziswe emva kokudibanisa unyango ukuze yenze i-robust transition layer; Ifilimu ye-adhesive ye-adhesive eshushu i-hot-melt i-lamination - iifilimu ze-FEP okanye ze-PFA (indawo yokunyibilika i-260-310 ° C) ibhondi yefilimu ye-PTFE eyenziwe ngaphambili kwilaphu; Ubume beGradient ngokusebenzisa ukufakwa okuphindaphindiweyo kunye nemijikelo ye-sintering - dilute ipasi yokuqala kunye ne-binder / i-agent edibanisayo ingena nzulu kwiifiber, ilandelwa yi-PTFE impregnations ecocekileyo, ukudala i-gradient yokwakheka ukusuka kwi-fiberglass ukuya kwi-PTFE ecocekileyo.

Eli nqaku lijongana nendlela uyilo lwesakhiwo se-microporous seTeflon ephefumlayo (PTFE) i-tape yobushushu obuphezulu ilinganisa ukufikeleleka komoya ngokugquma kunye neempawu ezingabambekiyo. Ungquzulwano olungundoqo: Ukungena komoya kufuna imingxunya evulekileyo, ngelixa ukugquma kufuna ukuxinana kunye nokungancamatheli kufuna umphezulu ogudileyo. Izicwangciso zoyilo olulungelelanisiweyo: lawula i-avareji ye-pore ye-diameter (0.1-2μm, ngokufanelekileyo <0.5μm) ukuthintela ukungena okunyibilikayo kunye nokugcina umbane wokuphuka; ukulawula i-porosity kwi-50-70% (≈60% ngokufanelekileyo) ukufezekisa i-Gurley 20-100s / 100cc kunye namandla e-dielectric ≥2kV yefilimu ye-0.13mm; yamkela ubume bepore womnatha ophezulu we-3D (τ≈2.5-4) ukucinezela imijelo yokukhupha ngokuthe ngqo; Yakha i-asymmetric gradient pore structure kunye ne-asymmetric surface skin layer (1-5μm) ye-non-stick / insulation kunye ne-porous yangaphakathi yokuphefumla; sebenzisa i-super-oleophobic/hydrophobic surface post-treatment ngaphandle kokuvaleka kwepore.

Eli nqaku libonelela ngezisombululo ezicwangcisiweyo zokuthintela intsalela encamathelayo kunye ne-adhesive bleed xa usebenzisa i-PTFE high-temperature tape ukukhusela iminwe yegolide ye-PCB ngexesha lendibano ye-SMT. Uhlalutyo lwesizathu esisisiseko: i-residue ivela ngenxa yokungaphumeleli kokubambisana okanye ukudluliselwa kwe-interfacial; ukopha kwenzeka ukusuka kwi-viscosity drop kunye ne-adhesive ephuphumayo phantsi kobushushu bokuphinda buphume. Isisombululo esingundoqo kukukhethwa kwe-tape efanelekileyo: i-silicone ye-PSA ene-peak yexesha elifutshane ≥300 ° C, eqhubekayo ≥260 ° C, ubukhulu bubonke 0.08-0.13mm kunye neengqimba ezinamathele ezinamathele eziphezulu, kunye ne-anti-bleed / i-residu-free certification. Ulawulo lwenkqubo yamanyathelo amathandathu: ukucocwa kwangaphambili kwe-lamination kunye ne-IPA; I-zero-tension lamination kunye nokukhutshwa komoya ngokupheleleyo; iprofayile yeqondo lobushushu eliphuculweyo ngokufudumeza okuthambileyo (<2°C/s); ukuxobuka okubandayo ngaphantsi kwe-50 ° C kwi-angle ye-180 °; ukusetyenzwa kwangoko kwiiyure ezingama-24 kunye nokusetyenziswa kanye kuphela; ukusilela ukuphatha ngokusula IPA kunye nokuhlolwa 40-50x sikhulisi. KwiiPCB ezinamacala amabini, buyisela iteyiphu entsha phambi kokulungiswa kwecala lesibini.

Eli nqaku libonelela ngesikhokelo esicwangcisiweyo sokuthintela imibimbi kwilaphu le-PTFE lobushushu obuphezulu ngexesha lokutshisa. Imibimbi ibangelwa ngokusisiseko kukuncipha kobushushu obungalinganiyo kunye noxinzelelo olungaguqukiyo. Izisombululo zigubungela ukuhamba komsebenzi okupheleleyo: ulawulo lwe-substrate yezinto eziluhlaza (i-dewaxing epheleleyo / ukusetha ubushushu ukuphelisa uxinzelelo lwangaphakathi); ukufakwa kunye nokomisa (iingubo ezininzi ezinqabileyo, i-gradient yobushushu obuthambileyo, i-roller drive esebenzayo); ulawulo lwesithando somlilo (i-1-3% i-overfeed yesibonelelo sokunciphisa i-thermal, i-loop-loop micro-tension control evaliweyo, ukufana kobushushu obunqamlezileyo ngaphakathi kwe-± 5 ° C, i-gradient preheating-sintering-cooling curve, i-air-flotation furnaces njengesisombululo esona sisombululo, i-curved spreader rollers); ukupholisa kunye nokuseta (ukupholisa kancinci kancinci, gcina ukunwenwa kude kube ngaphantsi kwe-100°C, ukupholisa okupheleleyo phambi kokujija); esweni kwi-intanethi ngohlolo oluluqilima lokukhanya kunye nokuskena kwe-infrared.

Eli nqaku libandakanya iimfuno zesantya sokupholisa ngexesha le-PTFE lobushushu obuphezulu belaphu sintering. Emva kokutshisa kwi-380-400 ° C, ilaphu kufuneka lidlule ngokukhawuleza kwindawo ye-crystallization-sensitive zone ye-310-315 ° C. Izinga lokupholisa elicetyiswayo lincinci i-30-50 ° C / min (ilaphu elincinci linokufikelela kwi-100-200 ° C / min ngokupholisa umoya). Ukupholisa okukhawulezayo (ukucima) kuvelisa i-crystallinity ephantsi (45-50%), inikezela iingubo ezithambileyo, ezinzima kunye neendawo ezigudileyo, ukunamathela okuqinileyo, ukusebenza kakuhle okungahambi kakuhle, kunye nokuchasana ne-delamination kunye nokuqhekeka. Ukupholisa okucothayo (ukupholisa kwesithando somlilo) kubangela i-crystallinity ephezulu (i-60-70%), ebangela ukuba i-rigid, i-brittle coatings ejongene nokunciphisa, i-peeling kunye ne-microcracks.

Eli nqaku lithelekisa ubushushu begumbi kunye nokuvuthwa okuphezulu kwe-silicone ye-adhesive-sensitive adhesive for PTFE tape. Ukuvuthwa kobushushu obuphezulu (120-180 ° C) kudala uthungelwano oluxineneyo oluqhagamshelweyo olunamandla abambeneyo aqinileyo, lukhusela intsalela encamathelayo emva kokuxobuka. Yenza iikhemikhali ze-anchoring bonds kunye ne-PTFE substrates ngokusebenzisa i-primer co-curing, ukuphelisa umngcipheko we-delamination. Ukuvuthwa okuphezulu kobushushu kwakhona kususa i-low-molecular volatiles ngaphambi kokunikezelwa, ukuthintela ukugquma kunye nokungcoliswa kweoli ye-silicone ngexesha lokufudumeza kokuqala.

Esi sikhokelo sibandakanya i-PTFE yokukhetha iteyiphu yobushushu obuphezulu bokubumba isitofu sokubumba kunye nezicelo zokuchasa intonga. Ukukhetha okusekelwe kwiqondo lokushisa: ≤260 ° C kwiiplastiki eziqhelekileyo (i-tape eqhelekileyo ye-silicone ye-PSA, 0.13-0.18mm); I-260-300 ° C kwiiplastiki zobunjineli obuphezulu obuphezulu njenge-PC, i-PA66, i-POM (i-adhesive ye-silicone ephezulu, i-0.18-0.25mm); I-300-400 ° C ye-PEEK, i-LCP, i-PPS kufuphi nabagijimi abashushu (i-adhesive tape iyasilela; sebenzisa ilaphu le-PTFE elingena-adhesive okanye ifilimu ye-PFA). Ukukhetha okusekwe kwizinto eziphathekayo: imathiriyeli ye-tacky ifuna ukukhutshwa okuphezulu okucocekileyo kwe-PTFE imiphezulu; iglasi / izinto zeminerali ezizaliswe zifuna umsebenzi onzima we-0.25mm + i-tape yokunxiba; izongezo ezonakalisayo zifuna ukuncamatheliswa kwekhemikhali kunye nesubstrate eshinyeneyo; izicelo ezingashukumiyo zifuna iteyiphu ye-PTFE echasene nestatic emnyama.

Ilaphu elinobushushu obuphezulu be-PTFE lenziwa ngokugquma i-PTFE kwilaphu le-fiberglass eyomelele kakhulu, linika amandla anqabileyo, ukuxhathisa ubushushu, iipropati ezinganamatheli, ukumelana neekhemikhali, kunye nokukhuhlana okuphantsi. Usetyenziso oluphambili lubandakanya: ukuhanjiswa kwemizi-mveliso (ukupakishwa kokunciphisa ubushushu, ukubhaka ukutya, izomisi zelaphu, ukomisa iphepha/ifilimu); ilaphu lokukhulula elidityanisiweyo kunye neelinen ezishushu zokucofa umqamelo; ukuwelda amakhethini akhuselayo kunye neebhatyi ze-thermal insulation; i-motor yombane kunye ne-transformer insulation; ukwakha iibheringi zokutyibilika kunye nezixhaso zemibhobho; ukuhluzwa kweekhemikhali kunye nokutywinwa kwevalvu kwindawo ezonakalisayo. Amandla aphezulu okuqina aqinisekisa ukuqina phantsi koxinzelelo, ukukrazula, ukuguquguquka okuphindaphindiweyo, kunye noxinzelelo oluphezulu lobushushu bomatshini kuzo zonke ezi zicelo zahlukeneyo zomsebenzi onzima.

Ngexesha le-sintering, amasuntswana e-PTFE kwilaphu ye-fiberglass anyibilika ngaphezulu kwe-327 ° C, etshabalalisa i-lamellae esongiweyo yoqobo kunye nemida yamasuntswana ukwenza i-amorphous melt. Ekupholiseni, i-PTFE iphinda ihlaziye kwi-spherulites eyenziwe nge-radially oriented lamellae, kunye ne-crystallinity esukela kwi-50-70%. Izinga lokupholisa limisela ukugqibelela kwekristale: ukupholisa okucothayo kuvelisa i-crystallinity ephezulu, ii-spherulites ezinkulu, ubunzima obukhulu; ukucima ngokukhawuleza kunika i-spherulites ecocekileyo kunye nokuguquguquka okuphuculweyo.