PTFE cov khoom siv kho tshuab tsis tshua muaj piv rau lwm cov yas, thiab tuaj yeem siv ntau qhov kub ntawm -100 ° F txog +400 ° F (-73 ° C txog 204 ° C).).Nws muaj cov thermal thiab hluav taws xob rwb thaiv tsev zoo heev thiab tsis tshua muaj coefficient ntawm kev sib txhuam.PTFE yog tuab heev thiab tsis tuaj yeem ua tiav los ntawm melting.PTFE yuav tsum tau compressed thiab sintered los tsim cov duab zoo.
PTFE Sheet, Qws, & Tube- Thermal stability PTFE yog ib qho ntawm cov khoom siv thermally ruaj khov tshaj plaws.Tsis muaj qhov txaus siab decompositions ntawm 260 ° C, yog li ntawd PTFE, ntawm qhov kub thiab txias, tseem muaj feem ntau ntawm nws cov khoom.Pom zoo decomposition pib ntawm 400 ° C.PTFE Hloov cov ntsiab lus-Cov geometry ntawm PTFE molecules (crystalline qauv) txawv nrog qhov kub thiab txias.Muaj cov ntsiab lus hloov pauv txawv, nrog rau qhov tseem ceeb tshaj plaws yog cov hauv qab no: tias ntawm 19 ° C sib haum rau kev hloov kho ntawm qee lub cev thiab qhov ntawm 327 ° C uas sib haum rau qhov ploj ntawm cov qauv crystalline: PTFE xav tias muaj ib qho amorphous. txuag nws tus kheej daim ntawv geometric.PTFE nthuav dav-Cov linear thermal expansion coefficient txawv nrog qhov kub thiab txias.Tsis tas li ntawd, vim yog kev taw qhia los ntawm cov txheej txheem ua haujlwm, PTFE daim feem ntau yog anisotropic;nyob rau hauv lwm yam lus, lub coefficient ntawm expansion kuj txawv nyob rau hauv relation mus rau kev taw qhia.PTFE thermal conductivity-Cov coefficient ntawm thermal conductivity ntawm PTFE tsis txawv nrog qhov kub thiab txias.Nws yog qhov siab, yog li PTFE tuaj yeem suav tias yog cov khoom siv insulating zoo.Kev sib xyaw ntawm cov khoom siv tsim nyog txhim kho cov thermal conductivity (saib PTFE puv).PTFE Cov cua sov tshwj xeeb-Cov cua kub tshwj xeeb, nrog rau cov ntsiab lus kub (enthalpy) nce nrog qhov kub thiab txias.PTFE Cwj Pwm nyob rau hauv muaj cov neeg sawv cev txawv teb chawsPTFE Resistance rau cov tshuaj chemical-PTFE yog xyaum inert tiv thaiv paub cov ntsiab lus thiab cov tebchaw.Nws tsuas yog tawm tsam los ntawm cov hlau alkaline hauv lub xeev theem pib, los ntawm Chlorine trifluoride thiab los ntawm cov Fluorine theem pib ntawm qhov kub thiab txias.PTFE Solvent kuj-PTFE yog insoluble nyob rau hauv yuav luag tag nrho cov kuab tshuaj ntawm kub txog li 300 ° C.Fluorinated hydrocarbons ua rau qee qhov o uas yog txawm li cas los xij thim rov qab;Qee cov roj fluorinated heev, ntawm qhov kub thiab txias tshaj 300 ° C, ua kom muaj kev cuam tshuam rau PTFE.PTFE Resistance rau atmospheric agents thiab lub teeb-Test pieces ntawm PTFE, nthuav tawm rau ntau tshaj nees nkaum xyoo rau qhov sib txawv huab cua feem ntau, tsis tau qhia txog kev hloov pauv ntawm lawv cov yam ntxwv.PTFE Resistance rau hluav taws xob-High zog hluav taws xob zoo li yuav ua rau tawg ntawm PTFE molecule, yog li ntawd cov khoom tiv thaiv rau hluav taws xob tsis zoo.PTFE Gas permeability-Qhov permeability ntawm PTFE zoo ib yam li lwm cov ntaub ntawv yas.Lub permeability tsis nyob ntawm seb, pom tseeb, tsuas yog nyob rau ntawm lub thickness thiab siab, tab sis kuj nyob rau hauv cov txheej txheem ua hauj lwm.Lub cev - mechanical zogTensile thiab compressive zog Cov khoom no yog mus rau qib loj cuam tshuam los ntawm cov txheej txheem ua haujlwm thiab cov hmoov ua haujlwm.PTFE, txawm li cas los xij, tuaj yeem siv tsis tu ncua ntawm qhov kub txog li 260 ° C, thaum tseem muaj qee qhov compressive plasticity ntawm qhov kub thiab txias ze rau Zero.PTFE Flexibility-PTFE yog qhov hloov tau yooj yim thiab tsis tawg thaum raug kev ntxhov siab ntawm 0.7 N / mm2 raws li ASTM D 790. Flexural modulus yog li 350 txog 650 N / mm2 ntawm chav tsev kub, txog 2000 N / mm2 ntawm -80 ° C , txog 200 N / mm2 ntawm 100 ° C thiab txog 45 N / mm2 ntawm 260 ° C.Cov khoom cuam tshuam-PTFE muaj cov yam ntxwv muaj zog heev kuj nyob rau qhov kub thiab txias.Yas nco-Yog hais tias ib daim ntawm PTFE raug rau tensile los yog compression stresses nyob rau hauv lub yield point, ib feem ntawm qhov tshwm sim deformations nyob twj ywm (raws li mus tas li deformations) tom qab lub discontinuance ntawm cov kev ntxhov siab, nrog rau qhov tshwm sim uas tej yam strains induced nyob rau hauv daim.Yog hais tias cov khoom yog reheated, cov hom no zoo li tso lawv tus kheej nyob rau hauv daim ntawv uas resumes nws thawj daim ntawv.Cov cuab yeej no ntawm PTFE feem ntau qhia tias yog "lub cim xeeb yas" thiab yog siv los ntawm ntau daim ntawv thov.Tsis tas li ntawd feem ntau ntawm cov khoom lag luam ib nrab tiav, vim yog cov txheej txheem hloov pauv, muaj cov kab mob zoo sib xws, mus rau qee yam.Thaum nws xav kom tau txais cov khoom tiav ib nrab ntawm qhov chaw ruaj khov ntawm qhov kub thiab txias, nws muaj peev xwm muab cov khoom mus rau qhov kub ntawm 280 ° C rau ib teev txhua 6 hli tuab thiab tom qab ntawd txias lawv maj mam.Cov khoom tau txais los ntawm qhov no yuav luag tag nrho tsis pub muaj kab mob sab hauv thiab feem ntau hu ua "conditioned" lossis "thermostabilized" cov khoom.Hardness-Qhov hardness Shore D, ntsuas raws li txoj kev ASTM D 2240, muaj qhov tseem ceeb ntawm D50 thiab D60.Raws li DIN 53456 (load 13.5 Kg rau 30 sec) lub hardness sways ntawm 27 thiab 32 N / mm2.Kev sib txhuam-PTFE muaj qhov sib txhuam qis tshaj plaws ntawm txhua yam khoom siv;ntawm 0.05 thiab 0.09:* qhov zoo li qub thiab dynamic kev sib txhuam coefficients yuav luag sib npaug, yog li tsis muaj kev qaug dab peg lossis ua haujlwm nplaum* thaum nce lub load, qhov sib txhuam coefficient txo kom txog thaum ncav cuag tus nqi ruaj khov* kev sib txhuam coefficient nce nrog qhov nrawm* qhov sib txhuam coefficient tseem nyob tas li ntawm qhov kub thiab txias.Hnav-Qhov hnav yog nyob ntawm qhov xwm txheej ntawm lwm qhov zawv zawg nto thiab pom tseeb nyob ntawm qhov ceev thiab thauj khoom.Qhov hnav tau txo qis thaum ntxiv cov khoom tsim nyog rau PTFE (saib PTFE puv).Cov khoom hluav taws xobPTFE rwb thaiv tsev-PTFE yog ib qho zoo heev insulator thiab precious dielectric raws li qhia los ntawm cov txheeb ze cov ntaub ntawv qhia nyob rau hauv datasheet thiab tswj cov yam ntxwv nyob rau hauv ib tug ntau yam ntawm tej yam kev mob, kub thiab frequencies.Dielectric zog-Lub zog dielectric ntawm PTFE sib txawv nrog lub thickness thiab txo nrog nce zaus.Nws tseem nyob twj ywm mus txog 300 ° C thiab tsis txawv txawm tias tom qab kev kho mob ntev ntawm qhov kub siab (6 lub hlis ntawm 300 ° C).Nws tseem nyob ntawm cov txheej txheem hloov pauv.Dielectric tas li thiab dissipation yam -PTFE muaj tsawg heev dielectric tas li thiab dissipation yam tseem ceeb;cov no nyob twj ywm tsis hloov mus txog 300 ° C, nyob rau hauv ntau zaus ntawm 109 Hz txawm tias tom qab kev kho cua sov ntev (6 lub hlis ntawm 300 ° C).Lub dielectric tas li, dissipation yam zoo li lub ntim resistivity thiab nto resistivity, suav hais tias yog ywj siab los ntawm kev hloov pauv.Arc-kuj-PTFE muaj kev tiv thaiv zoo rau lub arc.Lub sij hawm arc kuj raws li ASTM D 495 yog 700 sec ..Tom qab ua haujlwm ntev, tsis muaj cov cim qhia ntawm qhov chaw charing.Corona cuam tshuam-Cov paug tawm los ntawm cov nyhuv corona tuaj yeem ua rau yaig ntawm PTFE nto uas, txawm li cas los xij, tau qhia tias yog qhov tsim nyog insulator nyob rau hauv rooj plaub muaj peev xwm sib txawv.Nto khoomLub molecular configuration ntawm PTFE coj mus rau nws qhov chaw ib tug siab anti-adhesiveness.Rau tib yam vim li cas cov chaw no tsis tshua muaj dej tsis zoo, lub kaum sab xis sib cuag nrog dej yog li 110 ° thiab nws muaj peev xwm lees paub tias, dhau ntawm qhov nro ntawm 20 noj mov / cm2, cov kua tsis ntub cov PTFE lawm.Ib qho tshwj xeeb etching kev kho mob ua rau cov chaw sib khi thiab wettable.
Post lub sij hawm: Jun-17-2020