PTFE a mawotchi katundu ndi otsika poyerekeza ndi mapulasitiki ena, ndipo angagwiritsidwe ntchito pa lonse kutentha osiyanasiyana -100 ° F kuti + 400 ° F (-73 ° C kuti 204 ° C).).Ili ndi mphamvu zabwino kwambiri zotenthetsera kutentha ndi magetsi komanso kugundana kochepa.PTFE ndi wandiweyani kwambiri ndipo sangathe kukonzedwa ndi kusungunuka.PTFE iyenera kupanikizidwa ndi sintered kupanga mawonekedwe othandiza.
PTFE Mapepala, Ndodo, & Tube- Kukhazikika kwamafuta PTFE ndi chimodzi mwazinthu zokhazikika kwambiri zamapulasitiki.Palibe decompositions appreciable pa 260 ° C, kotero kuti PTFE, pa kutentha, akadali katundu wake ambiri.Kuwola kovomerezeka kumayambira pa 400 ° C.PTFE Transition points-Geometry ya mamolekyu a PTFE (crystalline structure) imasiyana ndi kutentha.Pali mfundo zosiyana za kusintha, ndi zofunika kwambiri ndi izi: kuti pa 19 ° C lolingana ndi kusinthidwa kwa zinthu zina zakuthupi ndi kuti pa 327 ° C zomwe zimagwirizana ndi kutha kwa mawonekedwe a crystalline: PTFE imatengera mbali ya amorphous. kusunga mawonekedwe ake a geometric.Kuwonjezeka kwa PTFE-Linear matenthedwe coefficient amasiyana ndi kutentha.Kuonjezera apo, chifukwa cha kayendetsedwe ka kayendetsedwe ka ntchito, zidutswa za PTFE nthawi zambiri zimakhala anisotropic;mwa kuyankhula kwina, coefficient ya kukulitsa imasiyananso mogwirizana ndi malangizo.PTFE Thermal conductivity-The coefficient wa matenthedwe madutsidwe wa PTFE si zimasiyana ndi kutentha.Ndizokwera kwambiri, kotero kuti PTFE ikhoza kuonedwa ngati chinthu chabwino chotetezera.Kusakanikirana kwa zodzaza zoyenera kumathandizira kutenthetsa kwamafuta (onani PTFE yodzaza).PTFE Kutentha kwenikweni-Kutentha kwapadera, komanso kutentha (enthalpy) kumawonjezeka ndi kutentha.PTFE Khalidwe pamaso pa othandizira akunjaPTFE Kukaniza kwa mankhwala othandizira-PTFE imakhala yosagwirizana ndi zinthu zomwe zimadziwika komanso zosakaniza.Imawukiridwa ndi zitsulo zamchere ku pulayimale, ndi Chlorine trifluoride komanso ndi Fluorine yoyambira pa kutentha kwambiri komanso kupsinjika.PTFE Solvent resistance-PTFE ndi insoluble pafupifupi onse zosungunulira pa kutentha kwa pafupifupi 300°C.Ma hydrocarbon okhala ndi fluorinated amachititsa kutupa kwina komwe kungathe kusintha;mafuta ena opangidwa ndi fluorinated kwambiri, pa kutentha pamwamba pa 300 ° C, amagwiritsa ntchito kusungunuka kwa PTFE.Kukaniza kwa PTFE kwa othandizira mumlengalenga ndi kuwala-Zidutswa zoyesa za PTFE, zowululidwa kwa zaka zopitilira makumi awiri ku nyengo yosiyana kwambiri, sizinawonetse kusintha kulikonse kwa mawonekedwe awo.PTFE Kukaniza ma radiation-Kutentha kwamphamvu kwamphamvu kumayambitsa kusweka kwa molekyulu ya PTFE, kotero kuti kukana kwa mankhwalawa ku radiation kumakhala koyipa.PTFE mpweya permeability-The permeability wa PTFE ndi ofanana ndi zipangizo zina pulasitiki.Kuthekera sikudalira, mwachiwonekere, kokha pa makulidwe ndi kupanikizika, komanso njira zogwirira ntchito.Physical - makina katunduZovuta komanso zopondereza Makhalidwewa amakhudzidwa kwambiri ndi momwe amagwirira ntchito komanso ufa wogwiritsidwa ntchito.PTFE, komabe, itha kugwiritsidwa ntchito mosalekeza pa kutentha mpaka 260 ° C, pomwe imakhala ndi pulasitiki yolimba kwambiri pa kutentha pafupi ndi Zero.Kusinthasintha kwa PTFE-PTFE imasinthasintha kwambiri ndipo siimathyoka pamene ikukumana ndi zovuta za 0,7 N / mm2 malinga ndi ASTM D 790. Flexural modulus ili pafupi 350 mpaka 650 N / mm2 kutentha kwa chipinda, pafupifupi 2000 N / mm2 pa -80 ° C , pafupifupi 200 N/mm2 pa 100°C ndi pafupifupi 45 N/mm2 pa 260°C.Impact katundu-PTFE ali kwambiri kulimba makhalidwe komanso pa kutentha otsika.pulasitiki kukumbukira-Ngati chidutswa cha PTFE chikukhudzidwa ndi kupanikizika kapena kupanikizika pansi pa zokolola, gawo lazowonongekazo zimakhalabe (monga zowonongeka kosatha) pambuyo pa kutha kwa kupsinjika maganizo, ndi zotsatira zake kuti zovuta zina zimapangidwira mu chidutswacho.Ngati chidutswacho chitenthedwanso, zovutazi zimadzimasula zokha mkati mwa chidutswa chomwe chimayambiranso mawonekedwe ake oyambirira.Katundu wa PTFE amasonyezedwa ngati "pulasitiki kukumbukira" ndipo amagwiritsidwa ntchito zosiyanasiyana ntchito.Komanso zinthu zambiri zomwe zatsirizidwa, chifukwa cha kusintha, zimakhala ndi zovuta zofanana, pamlingo wina.Mukafuna kupeza magawo omalizidwa pang'ono mokhazikika pa kutentha kwakukulu, ndizotheka kuyika zigawozo ku kutentha kwa 280 ° C kwa ola limodzi pa makulidwe 6 mm aliwonse ndikuziziritsa pang'onopang'ono.Zigawo zomwe zapezedwa motere zimakhala zopanda mphamvu zamkati ndipo nthawi zambiri zimadziwika kuti "conditioned" kapena "thermostabilised".Kuuma-Kuuma kwa Shore D, kuyeza molingana ndi njira ya ASTM D 2240, kuli ndi makhalidwe omwe ali pakati pa D50 ndi D60.Malinga ndi DIN 53456 (katundu 13,5 Kg kwa 30 sec) kuuma kumayenda pakati pa 27 ndi 32 N/mm2.Kukangana-PTFE ili ndi ma coefficients otsika kwambiri azinthu zonse zolimba;pakati pa 0.05 ndi 0.09:* ma static and dynamic friction coefficients amakhala pafupifupi ofanana, kotero kuti palibe kugwidwa kapena kutsetsereka* powonjezera katundu, kugundana kwapakati kumachepa mpaka kufika pamtengo wokhazikika* kugundana kumawonjezeka ndi liwiro* kugundana kokwanira kumakhalabe kosasintha pakusinthasintha kwa kutentha.Valani-Kuvala kumadalira momwe malo ena otsetsereka alili ndipo mwachiwonekere zimatengera kuthamanga ndi katundu.Kuvala kumachepetsedwa kwambiri powonjezera zodzaza zoyenera ku PTFE (onani PTFE yodzaza).Mphamvu zamagetsiPTFE Insulation-PTFE ndi insulator yabwino kwambiri komanso dielectric yamtengo wapatali monga momwe zasonyezedwera ndi deta yachibale yomwe yafotokozedwa mu datasheet ndipo imasunga makhalidwewa pamitundu yambiri ya chilengedwe, kutentha ndi ma frequency.Mphamvu ya dielectric-Mphamvu ya dielectric ya PTFE imasiyanasiyana ndi makulidwe ndikucheperako ndikuwonjezeka pafupipafupi.Imakhalabe nthawi zonse mpaka 300 ° C ndipo sichisintha ngakhale mutalandira chithandizo kwa nthawi yayitali pa kutentha kwakukulu (miyezi 6 pa 300 ° C).Zimatengeranso njira zosinthira.Dielectric constant and dissipation factor -PTFE ili ndi ma dielectric otsika kwambiri osasintha komanso kutayika kwa zinthu;izi zimakhalabe zosasinthika mpaka 300 ° C, m'magawo afupipafupi mpaka 109 Hz ngakhale mutalandira chithandizo cha nthawi yayitali (miyezi 6 pa 300 ° C).The dielectric constant, dissipation factor komanso voliyumu resistivity ndi surface resistivity, zimaganiziridwa kuti ndizodziimira pakusintha.Arc-kukana-PTFE ili ndi kukana bwino kwa arc.Nthawi yotsutsa arc malinga ndi ASTM D 495 ndi 700 sec.Pambuyo pakuchitapo kanthu kwa nthawi yayitali palibe zizindikiro za kuwomba pamwamba.Corona effect resistance-The zotuluka chifukwa corona zotsatira zingachititse kukokoloka kwa PTFE pamwamba amene, komabe, akusonyeza ngati insulator yoyenera ngati pali kusiyana mkulu kuthekera.Pamwamba katunduKusintha kwa ma molekyulu a PTFE kumabweretsa mawonekedwe ake odana ndi zomatira.Pachifukwa chomwechi pamalowa ndi ovuta kunyowa, kukhudzana ngodya ndi madzi ndi za 110 ° ndipo n'zotheka kutsimikizira kuti, kupyola mavuto padziko 20 Dine/cm, madzi salinso wets ndi PTFE.Kuchiza kwapadera kumapangitsa kuti malowo akhale olimba komanso onyowa.
Nthawi yotumiza: Jun-17-2020