PTFE yog ib qho thermoplastic polymer, uas yog cov khoom dawb ntawm chav tsev kub, nrog qhov ceev ntawm li 2200 kg / m3.Nws tuav lub zog siab, toughness thiab nws tus kheej lubrication ntawm qhov kub qis mus rau 5 K (−268.15 ° C; −450.67 ° F), thiab ua tau zoo ntawm qhov kub siab tshaj 194 K (-79 ° C; -110 ° F).PTFE tau txais nws cov khoom los ntawm kev sib sau ua ke ntawm carbon-fluorine bonds, zoo li tag nrho cov fluorocarbons.Tsuas yog cov tshuaj uas paub tias cuam tshuam rau cov carbon-fluorine bonds yog cov hlau reactive zoo li cov hlau alkali, thiab nyob rau ntawm qhov kub siab dua kuj xws li hlau xws li txhuas thiab magnesium, thiab cov tshuaj fluorinating xws li xenon difluoride thiab cobalt (III) fluoride.
Cov coefficient ntawm kev sib txhuam ntawm cov yas feem ntau yog ntsuas tawm tsam polished steel.PTFE tus coefficient ntawm kev sib txhuam yog 0.05 txog 0.10, uas yog qhov thib peb-qis tshaj ntawm cov khoom siv paub zoo.PTFE qhov kev tiv thaiv rau van der Waals rog txhais tau hais tias nws tsuas yog paub qhov chaw uas gecko tsis tuaj yeem lo.Qhov tseeb, PTFE tuaj yeem siv los tiv thaiv cov kab nce toj ntawm cov khoom pleev xim.PTFE yog nplua heev uas kab tsis tuaj yeem tuav tau thiab zoo li poob.
Vim nws cov tshuaj inertness, PTFE tsis tuaj yeem sib txuas tau zoo li elastomer.Yog li ntawd, nws tsis muaj "nco" thiab yuav raug creep.Vim tias nws cov khoom zoo tshaj plaws thiab cov khoom siv thermal, PTFE feem ntau yog siv los ua cov khoom siv gasket hauv kev lag luam uas yuav tsum muaj kev tiv thaiv rau cov tshuaj phem xws li tshuaj lossis tshuaj ua haujlwm.Txawm li cas los xij, vim tias qhov kev xav tau nkag mus, kev ua haujlwm ntev ntawm cov ntsaws ruaj ruaj yog qhov phem dua li cov elastomers uas pom zero, lossis zero, qib nkag.
Kev ua PTFE tuaj yeem nyuaj thiab kim, vim tias qhov kub siab melting, 327 ° C (621 ° F), yog siab tshaj qhov pib decomposition kub, 200 ° C (392 ° F).Txawm tias thaum melted, PTFE tsis ntws, tab sis es tsis txhob coj li ib tug gel vim tsis muaj crystalline theem thiab siab yaj viscosity.
Qee qhov PTFE yog tsim los ntawm txias-moulding, ib daim ntawv ntawm compression molding.Ntawm no, hmoov zoo PTFE raug yuam mus rau hauv pwm nyob rau hauv siab.Tom qab lub sij hawm daws teeb meem, kav ntev li ntawm feeb mus rau ib hnub, cov pwm yog rhuab ntawm 360 mus rau 380 degrees Celsius, tso cai rau cov khoom zoo fuse rau hauv ib qho loj.
Post lub sij hawm: Jun-18-2020