I-PTFE iyinto ewusizo kakhulu ngoba inenhlanganisela eyingqayizivele yezakhiwo.I-PTFE ayisebenzi ngamakhemikhali, iyakwazi ukumelana nesimo sezulu, ifaka ugesi omuhle kakhulu, ukumelana nokushisa okuphezulu, i-coefficient ephansi yokungqubuzana kanye nezakhiwo ezinganamatheli.
Ama-polymers avame ukusetshenziswa ekwenziweni nasebunjiniyela, nokho-ke, ucwaningo olushicilelwe oluchaza izakhiwo zabo zemishini lubonakala lungamelweli kahle uma kubhekwa ukubaluleka kwalo.Iningi ledatha ethulwayo, ngokuvamile linikeza ulwazi olunganele mayelana nohlu lozalo oluqondile lwe-polymer ehloliwe kanye nomlando wayo wokucubungula.Lokhu kungenzeka kungenxa yokuthi ukusungula ukucaciswa kwempahla yomugqa oyisisekelo kuvame ukuba nzima njengokwenza izivivinyo zangempela zemishini.Ukwengeza, ukumodela okunembile kwekhompiyutha kokuphendula komshini we-polymer kuseyinsakavukela.Izindlela eziningi ezisetshenziswayo zivame ukusetshenziswa, kodwa zivame ukungalungile ngaphandle kobubanzi bepharamitha obuncane .Isizathu esisodwa salokhu, ngaphandle kwenkimbinkimbi yempendulo ye-polymer, ukuthi ngokuvamile idatha ayitholakali ngaphandle kobubanzi bepharamitha yokuhlola ukuze inselele futhi andise ukuqina kwamamodeli asekelwe embonini ye-empirical noma e-phenomenological.Lapha, sethula imiphumela yokuqala yomzamo ohlangene wokuqondiswa kwezigwegwe okuhloswe ngawo ukuqonda impendulo yemishini ye-polymer enezimpawu ezinhle kusukela kokubili endaweni yokubuka yokuhlola futhi kamuva, okuhambisana nokukhiqizwa kwemodeli yethiyori eqinile ekwazi ukusetshenziswa kumakhodi ekhompyutha. .
I-polymer echazwe kulolu cwaningo i-poly(tetrafluoroethylene) (PTFE).Ikhethwe ngenxa yezizathu eziningana, kuhlanganise nokusetshenziswa kwayo njengento evamile yobunjiniyela ezingxenyeni ezincane ezisebenza kahle kanye nokutholakala kwayo kubakhiqizi abaningana.Nakuba ifundwe kabanzi esikhathini esidlule, iye yathola ukunakwa okuncane ezincwadini ezivulekile kule minyaka engu-25 edlule.Sikhethe ukuphinde sivakashele le nto ngenxa yobunkimbinkimbi bayo besakhiwo kanye nokushoda kwedatha yomshini.I-PTFE iwumsebenzi ophawulekayo ngezindlela eziningi .Ibonisa izinto eziwusizo phezu kobubanzi bokushisa obubanzi kunanoma iyiphi i-polymer;I-PTFE igcina isilinganiso esithile se-ductility ku-4 K futhi kwezinye izimo isetshenziswa ezinhlelweni eziku-540 8C .Ayincibiliki kuzo zonke izinyibilikisi ezivamile futhi imelana cishe nazo zonke izinto ezine-asidi ne-caustic.I-PTFE iphakathi kokumelana okuphezulu kakhulu kwanoma iyiphi impahla, amandla e-dielectric aphezulu kakhulu nokulahleka kwe-dielectric okuphansi.I-coefficient ye-sliding friction phakathi kwe-PTFE nezinto eziningi zobunjiniyela iphansi kakhulu futhi uma ihlanganiswe nezinhlanganisela zokunciphisa ukuguga, kwakheka isigaba esibalulekile ngokwemboni sezinto ezithwalayo.Ihlanganiswe ne-coefficient yayo ephansi yokungqubuzana nokuzinza kwamakhemikhali, i-PTFE cishe ayinakwenzeka kwezinye izinto ukuthi zibambelele kukho.Lesi sakhiwo sivame ukusetshenziswa kubuchwepheshe bokucubungula izimboni lapho kulula ukuhlanza kubalulekile.Isici esisodwa se-PTFE esiyibambe emuva ekusetshenzisweni okubanzi kwezimboni nobunjiniyela i-viscosity yayo ephezulu yokuncibilika (1011 P at 380 8C).Lokhu kuvimbela ukubumba komjovo nokuvuthela ukuthi kwenzeke futhi izinqubo zokukhiqiza ezibizayo kuphela ze-sintering ne-extrusion ezitholakalayo zokukhiqiza ingxenye.
Leli phepha ligxile ekwakhiweni kwezinto ezibonakalayo zomugqa wesisekelo kanye nempendulo ecindezelayo yezinto zokwakha ze-PTFE zozalo ngamazinga okushisa ahlukene namazinga okushisa.Amaphepha esikhathi esizayo azobhekana nokushuba nokugundwa kwe-shear, imiphumela enemininingwane ye-polymer crystallinity, i-ballistic kanye nokuziphatha kokushaqeka kanye nokuthuthukiswa kwemodeli yetiyori esebenzayo.
Ucwaningo oluncane kakhulu lwangaphambilini mayelana nezakhiwo ezicindezelayo ze-PTFE lushicilelwe.Olunye ucwaningo mayelana nezakhiwo ze-creep lukhona, kodwa mayelana ne-engineeringdeformation, izinkomba eziyisithupha kuphela eziye zaqaphela ababhali.Ngo-1963, uDavies washicilela iphepha ngokuthuthukiswa kohlelo lwebha ye-Split-Hopkinson.Njengengxenye yalo mbiko, ingcindezi yegumbi elilodwa lokushisa/ijika le-PTFE yethulwe kokuthi z1700 sK1.Ubukhulu bobunzima obubekwe kulolu hlelo bekungama-3% kuphela.Idatha eyengeziwe yezinga le-highstrain ku-polymer ngokumelene nezinga lokushisa yashicilelwa u-Grey no-Walley.U-Koo ushicilele idatha ye-stress/strain yomkhiqizo we-Imperial Chemical Industries PTFE obizwa nge-Halon G-80 ngo-1965.Imiphumela yezinga lokushisa ekuphenduleni kwemishini nayo yaxoxwa kafushane.
Isikhathi sokuthumela: Aug-16-2016