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%), inika 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.

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 lokubumba 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.

Lo mfutshane wobugcisa ovela kuJiangsu Aokai uhlalutya indlela amaqondo obushushu aphantsi okanye aphezulu alonakalise ngayo i-PTFE yobushushu obuphezulu. I-sintering ephantsi ishiya amasuntswana anganyibilikiyo, ebangela i-micro-pores, i-coating-substrate bonding ebuthathaka, indawo erhabaxa, amandla omatshini abuthathaka, kunye nenkangeleko yobisi emhlophe. Ubushushu obugqithisileyo bubangela i-PTFE ukuthotywa kwe-thermal, ivelise imingxunya, amaqamza, ukonakala, ukujika kombala omthubi ukuya kwabamnyama, kunye nokukhupha imisi eyityhefu. Zombini ezi zinto zigqithileyo zitshabalalisa ukubumbana, ukusebenza okungabambekiyo, ukuguquguquka, ukugquma, kunye nokuzinza komda.

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 engasiyontonga (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 flatness 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 kuphole 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 (ibhanti ebhadulayo, 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 bunyuka: 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.

Ilaphu le-PTFE elinobushushu obuphezulu liveliswa nge-single-dip impregnation (ipasi enye: ngokukhawuleza, ngexabiso eliphantsi, isambatho esibhityileyo, indawo erhabaxa enemibhobho) okanye i-multi-dip impregnation (i-2-3+ idlula: i-coating egudileyo, eshinyeneyo, i-pinhole-free, umxholo we-PTFE 50-70%, ukusebenza kweprimiyamu, ixabiso eliphezulu). Idiphu enye ifanela iigaskets zomgangatho ophantsi, iimethi zexeshana, kunye nezinto eziphefumlayo. I-Multi-dip iyafuneka kumaphepha okubhaka ebakala lokutya, amabhanti okuhambisa angeyontonga, i-high-frequency circuit substrates, ii-chemical liners, kunye ne-architectural membranes.

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 okukhawulezayo, ubunzulu obuncinci), kunye nonyango lwe-laser (i-precision micro-patterning, i-controlled carbonization). Zonke iindlela zokwenziwa zirhabaxa ngokwasemzimbeni kwaye zazisa ngokwamaqela amaqela amhlophe ngokwekhemikhali (C=O, -OH, -COOH) ukwenza ukuba kudityaniswe izinto ezincamathelayo.