I-PTFE i-gaskets ekhusela ilaphu eliphezulu idibanisa amandla aphezulu e-dielectric (uzinzile phantsi komswakama), -70 ° C ukuya kwi-260 ° C uluhlu lobushushu, ukuxhathisa imichiza jikelele (ngaphandle kweentsimbi ezityhidiweyo zealkali), indawo engekho intonga (ithintela i-creepage), i-anti-creep (i-fiberglass reinforcement vs. V-0 idangatye ukukala. Xa kuthelekiswa ne-mica, irabha, kunye ne-PTFE gaskets ecocekileyo, ilaphu le-PTFE libonelela ngokuguquguquka okuphezulu, ukuqhubekeka, kunye nokuzinza kwexesha elide. Ilungele iziguquli, ukugqunywa kwemoto, ukutywinwa kweekhemikhali zeflange, kunye nezixhobo zesemiconductor.

PTFE ilaphu flat ngexesha sintering kufuna uxinzelelo oluchanekileyo, ubushushu, kunye nolawulo lokuzibamba. Iindlela ezingundoqo: umatshini we-stenter (iipleyiti zepini zigcina ububanzi, zithintela ukuncipha kwe-weft), iphrofayili yobushushu be-gradient (ukufudumeza okucothayo → 380-400 ° C ukubamba → ukupholisa okucothayo ngaphantsi kwe-310 ° C ngaphambi kokukhulula ukuxhatshazwa), i-substrate yangaphambili (isusa uxinzelelo olulukiweyo ngaphambi kokugquma), kunye nobukhulu obufanayo bokugquma (ukuthintela ukunyibilika kokwahlukana). Ukuthintela i-Sternter kufuneka kugcinwe kude kube kupholisa ngaphantsi kwe-PTFE crystallization point (malunga ne-310 ° C) ukukhusela i-warpage.

Ukwaleka ukufana ngexesha le-PTFE emulsion imregnation yelaphu le-fiberglass ngumgca wobomi bomgangatho wemveliso. Ukungalingani kokugquma oonobangela: ukungaphumeleli kwentonga (ukuncamathela kwiindawo ezibhityileyo), ubuthathaka bomatshini (uxinzelelo loxinzelelo, ukukrazula), ukungazinzi kombane (ukuqhekeka kombane wehla ukuya ku-1/10), ukungena kweekhemikhali (i-pinhole corrosion), imiba yobukhulu (i-warpage), kunye neziphene zokulungisa (ukuzulazula kwebhanti, ukuguquguquka kobukhulu). Ukwaleka okufanayo kufuna ulawulo oluchanekileyo lwe-emulsion viscosity, umxholo oqinileyo, ukuxinezeleka kwelaphu, izithuba ezixineneyo, kunye neeprofayili zokomisa / ze-sintering kwiindawo ezininzi.

Ilaphu le-PTFE elinobushushu obuphezulu liya kumanqanaba amane otshintsho lwesakhiwo njengoko ubushushu buphakama: ngaphantsi kwe-260°C – ukuqhekeka okucothayo okuncinci kunye nokuguquguquka okuseleyo kokongeza; kwi-327 ° C (i-melting point) - i-crystalline-to-amorphous transition, i-coating iyancipha, iyancipha kwi-fiberglass; 400-500 ° C - PTFE depolymerizes (ikhupha iigesi ezinetyhefu), i-coating iyanyamalala; ngaphezu kwe-500 ° C - i-fiberglass iyancipha (i-840 ° C i-softening point) kwaye ilahlekelwa yingqibelelo yesakhiwo. Hlala ngaphantsi kwe-260 ° C ngokuqhubekayo, unqande > iincopho ze-300 ° C ukuze usebenze ngokukhuselekileyo.

I-PTFE yobushushu obuphezulu bonyango lomphezulu welaphu lophula ukunganyaniseki kweekhemikhali kwibhondi/yokushicilela. Iindlela ezine: i-chemical etching (i-sodium-naphthalene, amandla angaphezulu kwe-20→ 40-50 dyn / cm, isigxina esimnyama esisisigxina, isakhiwo se-micro-porous), unyango lwe-plasma (i-nano-roughening, i-grafting yeqela elisebenzayo, ifestile emfutshane esebenzayo), unyango lwe-corona (ifilimu encinci, ukubola ngokukhawuleza, ubunzulu obuncinane), kunye nonyango lwe-laser (i-precision micro-patterning, i-controlled carbonization). Zonke iindlela zirhabaxa ngokwasemzimbeni kwaye zazisa ngokwekhemikhali amaqela amhlophe (C=O, -OH, -COOH) ukwenza ukubamba okuncamathelayo.

Ukucoceka kwempahla ekrwada sisiseko se-PTFE somgangatho ophezulu welaphu lobushushu. Ukungcola (iziqalisi ezishiyekileyo, ii-athon zentsimbi, ii-agent zokulinganisa ezingcolisekileyo) zibangela ukuwohloka kobushushu kwangaphambi kwexesha (amaqamza, amadyungudyungu angaphezu kwama-260°C), imiphezulu engalinganiyo intonga (amanqaku okuncamathela), ukunciphisa ukugqunywa kombane (ilahleko ye-dielectric, ukuqhawuka kombane osezantsi), ukuwohloka kombane ophantsi), ukudodobala kokuqina komatshini (uxinzelelo olutyheli/uxinzelelo lombala, ukuxinezeleka okutyheli). Izinto eziluhlaza ezicocekileyo ziqinisekisa i-FDA-ithobela, ubomi obude, i-PTFE esebenza kakhulu.

I-PTFE-coated fiberglass ilaphu sintering kufuna ixesha elichanekileyo lokubamba kwi-370-400 °C. Iifurnas eziqhubekayo: 30-90s (encinci) ukuya kwi-3-5 + min (ebanzi). Izithando zeBatch: 5-15 min. I-under-sintering ibangela i-opaque, iingubo ezinqabileyo eziqhekezayo; i-sintering kakhulu ibangela ukuba tyheli, ukubhitya, kunye nokukhutshwa kwerhasi eyityhefu yefluoride. Ukulungiswa kwenkqubo: sebenzisa i-trackers zeqondo lokushisa, yenza uhlolo olubonakalayo (i-semi-transparent, flexible), kwaye wenze iimvavanyo zokutsala iteyiphu. Ngalo lonke ixesha qinisekisa ukutyeba okupheleleyo kobushushu obufanayo.

Ilaphu le-PTFE lobushushu obuphezulu lifuna ukuphathwa ngononophelo ukuqinisekisa ukhuseleko kunye nobomi obude. Amanyathelo okhuseleko angundoqo: ungaze udlule kwi-260 ° C (ngaphezulu kwe-320 ° C ikhupha umsi oyityhefu), thintela ukukrazuka okubukhali (iintanda zokugquma, ukuveza i-fiberglass), akukho ukucocwa kwe-abrasive (uboya bentsimbi yonakalisa umphezulu ongekho intonga), gcina i-thermal clearance clearance (ithintela ukukrazuka), kwaye endaweni yayo xa idutyulwe okanye ixotyulwe. Ivenkile iqengqiwe, kude neUV. Nxiba iiglavu ezikhusela ukushisa ngexesha lokuphatha.

Ilaphu le-PTFE elinobushushu obuphezulu linomlinganiso wokwandiswa kwe-thermal (CTE) ye-30-60 ppm/°C (i-warp/weft) - iphezulu kune-fiberglass yodwa kodwa isezantsi kakhulu kune-PTFE ecocekileyo (100-200 ppm/°C). I-PTFE idlula ngokukhawuleza utshintsho lwevolumu (1-2%) kwi-19 ° C kunye ne-30 ° C yenguqu yesigaba. Ukunqanda ukubambana, ukukrazula, kunye nokudilizwa: ukucinywa koyilo lolwandiso lwasimahla, kunqande ukuxinezeleka ngamaqondo obushushu besigaba, sebenzisa izithinteli ezizenzekelayo kumabhanti okuhambisa, kwaye usebenzise uyilo oluchasene ne-buckling overlap. Ukuhlolwa rhoqo ukuhamba okubandayo kubalulekile.

I-PTFE i-high-temperature yokushisa ilaphu lokubhaka iimathi zinika iingenelo ezine eziphambili: ukusebenza okungagungqiyo (akukho mafutha okanye umgubo ofunekayo, i-pastries ethambileyo ikhupha ngokucocekileyo), uluhlu olubanzi lobushushu (-70 ° C ukuya ku-260 ° C, lukhuselekile kwi-oven ukuya kwisikhenkcisi), ukusebenziseka kwakhona (amawaka emijikelo, kulula ukuyicoca), kunye nokuqhuba ubushushu (ukuthintela ukutshisa, ukulungelelaniswa okuntsundu). I-FDA yomgangatho wokutya iyahambelana, ikhupha iphepha lesikhumba kwaye igqithise iimethi ze-silicone ngokugqithisela ubushushu obungcono kunye nokucoleka komphezulu.