Iipropati zoomatshini ze-PTFE ziphantsi xa kuthelekiswa nezinye iiplastiki, kwaye zingasetyenziswa phezu koluhlu olubanzi lobushushu ukusuka -100°F ukuya +400°F (-73°C ukuya ku-204°C).).Ineempawu ezigqwesileyo zobushushu kunye nombane kunye ne-coefficient ephantsi yokukhuhlana.I-PTFE ixinene kakhulu kwaye ayinakwenziwa ngokunyibilika.I-PTFE kufuneka icinezelwe kwaye igxininiswe ukwenza iimilo eziluncedo.
Iphepha le-PTFE, intonga, & neThubhu- Thermal uzinzo PTFE yenye imathiriyeli zeplastiki ezinzile thermally.Akukho ukubola okuxabisa kwi-260 ° C, ukuze i-PTFE, kweli qondo lobushushu, isenayo ininzi yeempawu zayo.Ukubola okuncomekayo kuqala ngaphezulu kwe-400°C.Amanqaku e-PTFE Transition-I-geometry yee-molecule ze-PTFE (isakhiwo se-crystalline) siyahluka kunye nobushushu.Kukho iindawo zotshintsho ezahlukeneyo, kunye nezona zibalulekileyo zilandelayo: ukuba kwi-19 ° C ehambelana nokuguqulwa kwezinto ezithile ezibonakalayo kwaye kwi-327 ° C ehambelana nokunyamalala kwesakhiwo sekristalline: i-PTFE ithatha i-amorphous aspect. ukugcina imo yayo yejometri.Ukwandiswa kwe-PTFE-I-coefficient yokwandisa i-thermal ehambelanayo iyahluka kunye nobushushu.Ukongeza, ngenxa yoqhelaniso olubangelwa yinkqubo yokusebenza, iziqwenga zePTFE ziqhelekile ukuba zi-anisotropic;ngamanye amazwi, i-coefficient yokwandisa iyahluka kwakhona ngokunxulumene nolwalathiso.PTFE Thermal conductivity-I-coefficient ye-thermal conductivity ye-PTFE ayihlukanga kunye nobushushu.Iphezulu kakhulu, ukuze i-PTFE ithathwe njengento efanelekileyo yokugquma.Ukuxutywa kwezihluzi ezifanelekileyo kuphucula ukuqhutyelwa kwe-thermal (jonga i-PTFE egcweleyo).PTFE Ubushushu obuthile-Ubushushu obuthile, kunye nobushushu obuthile (enthalpy) buyanda kunye nobushushu.PTFE Ukuziphatha phambi kweearhente zangaphandleI-PTFE Ukumelana neekhemikhali-PTFE ayisebenzi ngokuchasene nezinto ezaziwayo kunye neekhompawundi.Ihlaselwe kuphela ziintsimbi zealkaline kwindawo yokuqala, yiChlorine trifluoride kunye neFluorine yokuqala kumaqondo obushushu aphezulu kunye noxinzelelo.PTFE Ukumelana nokunyibilika-PTFE ayinyibiliki phantse kuzo zonke izinyibilikisi kumaqondo obushushu ukuya malunga 300°C.Iihydrocarbon eziFluorinated zibanga ukudumba okuthile okunokubuyiselwa umva;ezinye iioyile ezinefluorinated kakhulu, kumaqondo obushushu angaphezu kwe-300°C, sebenzisa isiphumo esithile sokunyibilikisa kwi-PTFE.I-PTFE Ukumelana neearhente ze-atmospheric kunye nokukhanya-Iingcezu zovavanyo lwe-PTFE, ezivezwe ngaphezulu kweminyaka engamashumi amabini kwezona meko zemozulu ezingafaniyo, azikhange zibonise naluphi na utshintsho kwiimpawu zazo.PTFE Ukumelana nemitha-High radiations yamandla idla ngokubangela ukwaphulwa kwemolekyuli ye-PTFE, ukuze ukuxhathisa kwemveliso kwimitha yemitha kunokuba kubi.PTFE Gas permeability-I-permeability ye-PTFE iyafana nezinye izinto zeplastiki.I-permeability ayixhomekeke, ngokucacileyo, kuphela kubunzima kunye noxinzelelo, kodwa nakwiindlela zokusebenza.Umzimba - iimpawu zomatshiniI-Tensile kunye ne-compressive properties Ezi zakhiwo zixhomekeke kwinqanaba elikhulu kwiinkqubo zokusebenza kunye nomgubo oqeshwayo.I-PTFE, nangona kunjalo, ingasetyenziswa ngokuqhubekayo kumaqondo obushushu ukuya kuthi ga kwi-260°C, ngelixa isenayo iplastiki ethile ecinezelayo kumaqondo obushushu akufutshane no-Zero ngokupheleleyo.Ukuguquguquka kwe-PTFE-PTFE iguquguquka kakhulu kwaye ayiphuli xa iphantsi koxinzelelo lwe-0,7 N / mm2 ngokwe-ASTM D 790. Imodyuli ye-Flexural imalunga ne-350 ukuya kwi-650 N / mm2 kwiqondo lokushisa, malunga ne-2000 N / mm2 kwi -80 ° C. , malunga ne-200 N / mm2 kwi-100 ° C kwaye malunga ne-45 N / mm2 ku-260 ° C.Iimpawu zempembelelo-I-PTFE ineempawu eziphezulu kakhulu zokomelela kwakhona kumaqondo obushushu aphantsi.Inkumbulo yeplastiki-Ukuba isiqwenga se-PTFE sixhomekeke kwi-tensile okanye uxinzelelo loxinzelelo olungaphantsi kwinqanaba lesivuno, inxalenye yeziphumo ezibangelwayo zihlala (njenge-deformations engapheliyo) emva kokuyeka ukunyanzeliswa kwengcinezelo, kunye nesiphumo sokuba iintlobo ezithile zinyanzeliswa kwisiqwenga.Ukuba iqhekeza liphinde lifudunyezwe, ezi ntlobo zivame ukuzikhulula ngaphakathi kweqhekeza eliphinda liqalise uhlobo lwalo lokuqala.Le propati ye-PTFE iqhele ukuboniswa njenge "memori yeplastiki" kwaye isetyenziswa kwizicelo ezahlukeneyo.Kwakhona uninzi lweemveliso ezigqityiweyo, ngenxa yeenkqubo zenguqu, zineengxaki ezifanayo, ukuya kwinqanaba elithile.Xa kunqweneleka ukuba kufumaneke iinxalenye ezisele zigqitywe ngomlinganiselo ozinzileyo kumaqondo obushushu aphezulu, kuyenzeka ukuba amalungu afakwe kwiqondo lobushushu elingama-280°C ngeyure enye rhoqo nge-6 mm yobukhulu kwaye emva koko uwapholise ngokucothayo.Amalungu afunyenwe ngolu hlobo aphantse akhululeke ngokupheleleyo kuxinzelelo lwangaphakathi kwaye ngokubanzi aziwa njenge "conditioned" okanye "thermostabilised" imathiriyeli.Ukuqina-Ubunzima be-Shore D, bulinganiswe ngokwendlela ye-ASTM D 2240, inamaxabiso aqulethwe phakathi kwe-D50 kunye ne-D60.Ngokutsho kweDIN 53456 (umthwalo we-13,5 Kg kwi-30 sec) ubunzima buhamba phakathi kwe-27 kunye ne-32 N / mm2.Ukukhuhlana-I-PTFE inee-coefficients zokukhuhlana ezisezantsi kuzo zonke izinto eziqinileyo;phakathi kwe-0.05 kunye ne-0.09:* i-coefficients emileyo kunye neguqukayo iphantse yalingana, ukuze kungabikho kuxhuzula okanye isenzo sokutyibilika.* xa unyusa umthwalo, i-coefficient ye-friction iyancipha de ifikelele kwixabiso elizinzile* i-coefficient ye-friction iyanda ngesantya* i-coefficient ye-friction ihlala ingatshintshi kwiinguqu zeqondo lokushisa.Nxiba-Ukunxitywa kuxhomekeke kwimeko yomnye umphezulu wokutyibilika kwaye ngokucacileyo kuxhomekeke kwisantya kunye nemithwalo.Ukunxitywa kuncitshiswe kakhulu xa ukongeza izizalisi ezifanelekileyo kwi-PTFE (jonga i-PTFE egcweleyo).Iimpawu zombaneUkufakwa kwe-PTFE-I-PTFE sisigqubuthelo esigqwesileyo kunye ne-dielectric exabisekileyo njengoko kubonisiwe kwidatha ehambelanayo echazwe kwi-database kwaye igcina ezi mpawu kuluhlu olukhulu lweemeko zokusingqongileyo, amaqondo obushushu kunye namaza.Amandla e-Dielectric-Amandla e-dielectric ye-PTFE ayahluka ngobukhulu kwaye ayancipha ngokunyuka kwamaza.Ihlala ingaguquguquki ukuya kutsho kuma-300°C kwaye ayihlukanga nasemva konyango olude kumaqondo obushushu aphezulu (iinyanga ezi-6 kuma-300°C).Ikwaxhomekeke nakwiinkqubo zenguqu.I-Dielectric constant and dissipation factor -PTFE ine-dielectric ephantsi kakhulu kunye ne-dissipation factor values;ezi zihlala zingaguquguquki kude kube yi-300 ° C, kwintsimi ephindaphindayo ukuya kuthi ga kwi-109 Hz nasemva konyango lwe-thermal olude (iinyanga ezi-6 kwi-300 ° C).I-dielectric constant, factor dissipation kunye ne-volume resistivity kunye ne-surface resistivity, ithathwa njengento ezimeleyo kwiinkqubo zenguqu.Arc-ukumelana-PTFE inokumelana kakuhle ne-arc.Ixesha lokumelana ne-arc ngokwe-ASTM D 495 yi-700 sec.Emva kwesenzo sexesha elide akukho zimpawu zokutshatyalaliswa komhlaba.Ukuxhathisa impembelelo yeCorona-Ukukhutshwa okubangelwa yimpembelelo ye-corona kunokubangela ukukhukuliseka kwendawo ye-PTFE, nangona kunjalo, ibonakaliswe njenge-insulator efanelekileyo xa kukho ukungafani okuphezulu.Iipropati zomphezuluUqwalaselo lwemolekyuli ye-PTFE izisa kwiindawo zayo ukuchasana nokuncamathela okuphezulu.Ngesi sizathu sinye le miphezulu ayinamanzi, i-engile yoqhagamshelwano ngamanzi imalunga ne-110 ° kwaye kuyenzeka ukungqina ukuba, ngaphaya koxinzelelo lomphezulu we-20 dine/cm, ulwelo alusayi kumanzisa i-PTFE.Unyango olukhethekileyo lwe-etching lunika umphezulu ukuba ubophelelekile kwaye ube manzi.
Ixesha lokuposa: Jun-17-2020