PTFE ndi zinthu zothandiza kwambiri chifukwa ali ndi kuphatikiza wapadera katundu.PTFE ndi mankhwala inert, weatherable, kwambiri kutchinjiriza magetsi, kutentha kukana, otsika coefficient wa mikangano ndi sanali zomatira katundu.
Ma polima amagwiritsidwa ntchito kwambiri popanga ndi uinjiniya, komabe, kafukufuku wofalitsidwa wofotokoza mawonekedwe awo amakanika akuwoneka kuti sakuyimilira chifukwa cha kufunikira kwawo.Zambiri zomwe zimaperekedwa, nthawi zambiri sizimapereka chidziwitso chokwanira chokhudzana ndi mtundu wapolima womwe wayesedwa komanso mbiri yake.Izi mwina ndichifukwa choti kukhazikitsa mawonekedwe azinthu zoyambira nthawi zambiri kumakhala kovuta ngati kuyesa kwenikweni kwamakina.Kuphatikiza apo, kutengera kolondola kwamakompyuta pamayankho amakina a polima kudakali koyambirira.Njira zambiri zoyeserera zimagwiritsidwa ntchito, koma zimakonda kukhala zosalondola pamlingo wocheperako.Chifukwa chimodzi cha izi, kupatula zovuta za kuyankha kwa polima, ndikuti nthawi zambiri deta sapezeka kunja kwa kayezedwe kakang'ono koyesera kuti atsutse ndikukulitsa kulimba kwa zitsanzo zamphamvu kapena phenomenological based constitutive.Apa, tikupereka zotsatira zoyamba za kuyesayesa kosiyanasiyana komwe cholinga chake ndi kumvetsetsa momwe ma polima odziwika bwino amayankhira kuchokera pazoyeserera komanso pambuyo pake, kuphatikiza kupanga chifanizo champhamvu chaukadaulo chomwe chimatha kukhazikitsidwa pamakhodi apakompyuta. .
Polima wofotokozedwa mu phunziroli ndi poly(tetrafluoroethylene) (PTFE).Anasankhidwa pazifukwa zingapo, kuphatikizapo kugwiritsidwa ntchito kwake ngati zipangizo zamakono zamakono zamagulu ang'onoang'ono apamwamba komanso kupezeka kwa opanga angapo.Ngakhale kuti idaphunziridwa kwambiri m'mbuyomu, idalandira chidwi chochepa m'mabuku otseguka kwa zaka 25 zapitazi.Tasankha kubwerezanso nkhaniyi chifukwa cha zovuta zake komanso kusowa kwa deta yamakina.PTFE ndi chinthu chodabwitsa m'njira zambiri.Imawonetsa zinthu zothandiza pamitundu yotentha kwambiri ya polima iliyonse;PTFE imasungabe muyeso wina wa ductility pa 4 K ndipo nthawi zina imagwiritsidwa ntchito pa 540 8C .Siyisungunula muzosungunulira zonse wamba ndipo imalimbana ndi pafupifupi zida zonse za acidic ndi caustic.PTFE ili pakati pa zopinga zapamwamba kwambiri zazinthu zilizonse, mphamvu ya dielectric yapamwamba kwambiri komanso kutayika kochepa kwa dielectric.The coefficient of sliding friction between PTFE and many engineering engineering is very low and when sintered with wear reduction compounds, a fakitale yofunika gulu la kubala zipangizo amapangidwa.Kuphatikizidwa ndi coefficient yake yotsika ya kukangana ndi kukhazikika kwa mankhwala, PTFE ndizosatheka kuti zida zina zitsatire.Katunduyu nthawi zambiri amagwiritsidwa ntchito muukadaulo wokonza mafakitale komwe kuyeretsa kosavuta ndikofunikira.Mbali imodzi ya PTFE yomwe yalepheretsa kugwiritsa ntchito mafakitale ndi uinjiniya wambiri ndi kusungunuka kwake kwakukulu (1011 P pa 380 8C).Izi zimalepheretsa jekeseni ndi kuumba kuwombera kuti zisatheke ndipo njira zopangira sintering ndi extrusion zokha zomwe zilipo kuti zipangidwe.
Pepalali limayang'ana kwambiri zamitundu yoyambira komanso kuyankha movutikira kwa zida za PTFE zamitundu yosiyanasiyana komanso kutentha.Mapepala amtsogolo adzakambirana ndi kuyankha kwamphamvu komanso kumeta ubweya, zotsatira zatsatanetsatane za polymer crystallinity, ballistic and shock behaviour komanso kakulidwe kachitsanzo chogwirizira.
Kafukufuku wocheperako wam'mbuyomu wokhudza compressive katundu wa PTFE wasindikizidwa.Kafukufuku wina wokhudza zinthu zakukwawa alipo, koma pankhani ya engineeringdeformation, ndi maumboni asanu ndi limodzi okha omwe adadziwika ndi olemba.Mu 1963, Davies adasindikiza pepala pakupanga makina a Split-Hopkinson bar.Monga gawo la lipotili, chipinda chimodzi cha kutentha kwa chipinda / kutsekemera kwa PTFE kunaperekedwa pa z1700 sK1.Kupsyinjika kwakukulu komwe kunayikidwa mu dongosololi kunali 3% yokha.Zina zambiri za highstrain rate pa polymer motsutsana ndi kutentha zinasindikizidwa ndi Gray ndi Walley.Koo adasindikiza deta ya nkhawa/strain ya chinthu cha Imperial Chemical Industries PTFE chotchedwa Halon G-80 mu 1965.Zotsatira za kutentha pamayankhidwe amakina zidakambidwanso mwachidule.
Nthawi yotumiza: Aug-16-2016