Izakhiwo zemishini ye-PTFE ziphansi uma ziqhathaniswa namanye amapulasitiki, futhi zingasetshenziswa phezu kwezinga lokushisa elibanzi lika -100°F kuya +400°F (-73°C kuya ku-204°C).).Inezici ezinhle kakhulu zokushisa ezishisayo nezikagesi kanye ne-coefficient ephansi yokungqubuzana.I-PTFE iminyene kakhulu futhi ayikwazi ukucutshungulwa ngokuncibilika.I-PTFE kumele icindezelwe futhi ifakwe i-sinter ukuze yakhe umumo owusizo.
Ishidi le-PTFE, Rod, & Tube- Ukuzinza kwe-Thermal PTFE kungenye yezinto zepulasitiki ezizinzile kakhulu.Akukho ukubola okuncomekayo ku-260°C, ukuze i-PTFE, kulelizinga lokushisa, isenayo iningi lezakhiwo zayo.Ukubola okuthandekayo kuqala ngaphezu kuka-400°C.PTFE Transition amaphuzu-I-geometry yama-molecule e-PTFE (isakhiwo se-crystalline) siyahlukahluka ngezinga lokushisa.Kunamaphuzu okuguquguquka ahlukene, abaluleke kakhulu yilawa alandelayo: ukuthi ku-19°C okuhambisana nokuguqulwa kwezakhiwo ezithile zomzimba nokuthi ku-327°C okuhambisana nokushabalala kwesakhiwo sekristalu: i-PTFE ithatha isici se-amorphous. igcina ifomu layo lejometri.Ukwandiswa kwe-PTFE-I-linear thermal expansion coefficient iyahlukahluka kuye ngezinga lokushisa.Ngaphezu kwalokho, ngenxa yokuma okubangelwa inqubo yokusebenza, izingcezu ze-PTFE ngokuvamile ziyi-anisotropic;ngamanye amazwi, i-coefficient yokwandisa iyahlukahluka futhi maqondana nesiqondiso.PTFE Thermal conductivity-I-coefficient ye-conductivity eshisayo ye-PTFE ayihlukani nezinga lokushisa.Iphakeme kakhulu, ukuze i-PTFE ithathwe njengento enhle yokuvikela.Ukuxutshwa kwezigcwalisi ezifanele kuthuthukisa ukuqhutshwa kokushisa (bona i-PTFE egcwalisiwe).Ukushisa okuqondile kwe-PTFE-Ukushisa okuqondile, kanye nokuqukethwe kokushisa (enthalpy) kukhuphuka nezinga lokushisa.Ukuziphatha kwe-PTFE phambi kwama-ejenti angaphandleI-PTFE Ukumelana nama-agent amakhemikhali-PTFE ayisebenzi ngokumelene nezakhi ezaziwayo nezinhlanganisela.Ihlaselwa kuphela yizinsimbi ze-alkaline endaweni yokuqala, yi-Chlorine trifluoride kanye ne-fluorine yokuqala emazingeni okushisa aphezulu kanye nezingcindezi.Ukumelana ne-PTFE Solvent-PTFE ayincibiliki cishe kuzo zonke izincibilikisi emazingeni okushisa afinyelela ku-300°C.Ama-hydrocarbon ane-fluorinated abangela ukuvuvukala okuthile kodwa okubuyiselekayo emuva;amanye amafutha ane-fluorinated kakhulu, emazingeni okushisa angaphezu kuka-300°C, asebenzisa umthelela othile wokuncibilika ku-PTFE.I-PTFE Ukumelana nama-ejenti asemkhathini nokukhanya-Izingcezu zokuhlola ze-PTFE, ezivezwe iminyaka engaphezu kwamashumi amabili ezimweni zezulu ezihluke kakhulu, azizange zibonise ukuguqulwa kwezici zazo.I-PTFE Ukumelana nemisebe-Imisebe ephezulu yamandla ivame ukubangela ukwephuka kwe-molecule ye-PTFE, ukuze ukumelana komkhiqizo emisebeni kube kubi kakhulu.PTFE Igesi permeability-The permeability of PTFE kuyafana nezinye izinto plastic.I-permeability ayincikile, ngokusobala, kuphela ekugqimeni nasekucindezelweni, kodwa futhi kumasu okusebenza.Izakhiwo zomzimba - mechanicalIzakhiwo eziqinile nezicindezelayo Lezi zakhiwo zithonywa ngokwezinga elikhulu yizinqubo zokusebenza kanye nempushana eqashiwe.I-PTFE, nokho, ingasetshenziswa ngokuqhubekayo emazingeni okushisa afika ku-260°C, ngenkathi isenayo ipulasitiki ethile ecindezelayo emazingeni okushisa aseduze noZiro ophelele.Ukuguquguquka kwe-PTFE-PTFE iguquguquka kakhulu futhi ayinqamuki lapho ingaphansi kwezingcindezi ze-0,7 N/mm2 ngokusho kwe-ASTM D 790. I-modulus ye-Flexural imayelana no-350 kuya ku-650 N/mm2 ekamelweni lokushisa, cishe ngo-2000 N/mm2 ku -80°C , cishe ku-200 N/mm2 ku-100°C futhi cishe ku-45 N/mm2 ku-260°C.Izici zomthelela-PTFE inezinto eziphakeme kakhulu zokuqina futhi emazingeni okushisa aphansi.Inkumbulo yepulasitiki-Uma ucezu lwe-PTFE lungaphansi kokucindezelwa okuqinile noma ukucindezela ngaphansi kwephuzu lokukhiqiza, ingxenye yokuguqulwa okuwumphumela ihlala (njengokuguqulwa okuhlala njalo) ngemva kokuyeka ukucindezeleka, nomphumela wokuthi izinhlobo ezithile zibangelwa ucezu.Uma ucezu lushisisa kabusha, lezi zinhlobo zivame ukuzikhulula ngaphakathi kwesiqephu esiqala kabusha isimo saso sangempela.Le mpahla ye-PTFE ivamise ukukhonjiswa “njengenkumbulo yepulasitiki” futhi isetshenziswa ezinhlelweni ezihlukene.Futhi iningi lemikhiqizo eqediwe, ngenxa yezinqubo zokuguqulwa, inezinhlobo ezifanayo, ngezinga elithile.Uma kufiswa ukuthola izingxenye eziqedwe kancane zizinze ngendlela esezingeni eliphezulu emazingeni okushisa aphezulu, kungenzeka ukubeka izingxenye ngaphansi kwezinga lokushisa elingu-280°C ihora elilodwa njalo ngo-6 mm wogqinsi bese uzipholisa kancane.Izingxenye ezitholwe ngale ndlela cishe azinalo nhlobo uhlobo lwangaphakathi futhi ngokuvamile zaziwa ngokuthi "i-conditioned" noma "thermostabilised" material.Ukuqina-Ukuqina kwe-Shore D, kukalwa ngendlela ye-ASTM D 2240, inamanani ahlanganiswe phakathi kuka-D50 no-D60.Ngokusho kwe-DIN 53456 (umthwalo ongu-13,5 Kg ngamasekhondi angu-30) ubulukhuni buyanyakaza phakathi kuka-27 no-32 N/mm2.Ukungqubuzana-PTFE inama-coefficients aphansi kakhulu azo zonke izinto eziqinile;phakathi kuka-0.05 no-0.09:* ama-coefficients amile futhi ashukumisayo acishe alingane, ukuze kungabikho ukubanjwa noma isenzo sokushelela* lapho ukhuphula umthwalo, i-coefficient yokungqubuzana iyehla ize ifinyelele inani elizinzile* i-coefficient ye-friction iyanda ngesivinini* i-coefficient yokungqubuzana ihlala ingashintshile ekushintsheni kwezinga lokushisa.Gqoka-Ukuguga kuncike esimweni senye indawo eshelelayo futhi ngokusobala kuncike kwijubane nemithwalo.Ukugqokwa kuncipha kakhulu uma wengeza izigcwalisi ezifanele ku-PTFE (bona i-PTFE egcwalisiwe).Izakhiwo zikagesiI-PTFE Insulation-I-PTFE iyisivikelo esihle kakhulu kanye ne-dielectric eyigugu njengoba kuboniswa idatha ehlobene ebikwe kumininingwane yedatha futhi igcina lezi zici kulo lonke uhla olukhulu lwezimo zemvelo, amazinga okushisa namaza.Amandla e-Dielectric-Amandla e-dielectric e-PTFE ayahlukahluka ngokuqina futhi ancipha ngokunyuka kwemvamisa.Ihlala ingashintshile kuze kufike ku-300°C futhi ayishintshi ngisho nangemva kokwelashwa isikhathi eside emazingeni okushisa aphezulu (izinyanga eziyisi-6 ku-300°C).Kuncike nasezinqubweni zenguquko.I-Dielectric constant and dissipation factor -PTFE inamanani aphansi kakhulu we-dielectric engaguquki kanye nezici zokulahla;lezi zihlala zingaguquki kuze kube ngu-300°C, emkhakheni wemvamisa ofika ku-109 Hz ngisho nangemva kokwelashwa okushisayo okude (izinyanga eziyisi-6 ku-300°C).I-dielectric constant, dissipation factor kanye ne-volume resistivity kanye ne-surface resistivity, kubhekwa njengokuzimele ezinqubweni zokuguqulwa.Ukumelana ne-arc-PTFE inokumelana okuhle ne-arc.Isikhathi sokumelana ne-arc ngokuya nge-ASTM D 495 singamasekhondi angama-700.Ngemuva kwesenzo eside azikho izimpawu zokushabalalisa phezulu.Ukumelana nomphumela weCorona-Ukukhishwa okubangelwa umphumela we-corona kungase kubangele ukuguguleka kwendawo ye-PTFE, noma kunjalo, kukhonjiswe njengesivikelo esifanelekile uma kwenzeka kuba nomehluko omkhulu.Izakhiwo ezingaphezuluUkucushwa kwamangqamuzana e-PTFE kuletha ezindaweni zayo ukungahambisani nokunamathela okuphezulu.Ngesizathu esifanayo lezi ezingaphezulu azikwazi ukumanzisa, i-engeli yokuthintana namanzi icishe ibe ngu-110° futhi kungenzeka ukuqinisekisa ukuthi, ngale kokushuba kwendawo okungu-20 dine/cm, uketshezi alusamanzisi i-PTFE.Ukwelashwa kwe-etching okukhethekile kwenza izindawo ezingaphezulu zibosheke futhi zibemanzi.
Isikhathi sokuthumela: Jun-17-2020