Ngokombono wezinto ezintathu ezinquma izici zemikhiqizo ye-PTFE - isisindo samangqamuzana, i-crystallinity kanye ne-voidage, i-voidage ithinteka kakhulu ingcindezi ye-preforming, kanye nesisindo se-molecular and crystallinity konke kuyashintsha ngezimo ezihlukene ze-sintering.Ngakho-ke,inqubo sinteringizimo zidlala indima ewujuqu ezimpahleni zokugcina zemikhiqizo efana nokuminyana, ubulukhuni, ukungeneka kanye nezakhiwo zemishini.
Ngokombono wezinto ezintathu ezinquma izici zemikhiqizo ye-PTFE - isisindo samangqamuzana, i-crystallinity kanye ne-voidage, i-voidage ithinteka kakhulu ingcindezi ye-preforming, kanye nesisindo se-molecular and crystallinity konke kuyashintsha ngezimo ezihlukene ze-sintering.Ngakho-ke, izimo zenqubo ye-sintering zidlala indima ewujuqu ezimpahleni zokugcina zemikhiqizo efana nokuminyana, ubulukhuni, ukuvuthwa kanye nezakhiwo zemishini.
Wang ping wathola ukuthiinqubo ye-sintering ye-PTFEyathintwa isivinini esikhuphukayo nesiwayo, izinga lokushisa le-sintering kanye nesikhathi se-sintering.Uma umkhiqizo umkhulu, ijubane lokukhuphuka kanye nokupholisa lihamba kancane, isikhathi se-sintering siba side.Izinga lokushisa elishisayo le-resin yokumiswa liphakeme kunalelo le-dispersion resin.Izinga lokushisa le-sintering lemikhiqizo yempahla ehlanzekile liphakeme kunalelo lemikhiqizo egcwele.Ngokuvamile, izinga lokufudumala liyashesha kunezinga lokupholisa.Esithandweni somlilo esifanayo, izinto ezihlanzekile kanye nemikhiqizo yokugcwalisa ayikwazi ukuxubana;Imikhiqizo enezimo ze-sintering ezahlukene ayikwazi ukuxutshwa.Imikhiqizo yezinto zokusetshenziswa ezahlukene ayikwazi ukuxutshwa.Ukuthatha ukukhiqizwa kwepuleti eliyindilinga elibunjwe ungqimba olu-3 elinobubanzi obuyi-1 m, ukushuba okungama-20 mm, ungqimba oluphindwe kabili njenge-ptfe ehlanzekile kanye nongqimba oluphakathi nendawo njengesibonelo, amandla okucindezela, amandla okugoba, ubulukhuni nezinye izakhiwo zemishini ipuleti eyindilinga laminated ekhiqizwa lobu buchwepheshe ithuthukiswe kakhulu.
U-Liu xianlan wafunda izici zenqubo yokwenza, indlela yokwenza kanye nezici zokuklama isikhunta ze-PTFE, wahlaziya amaphutha kanye nezimbangela zemikhiqizo ye-PTFE ekhiqizwa ukucindezela okubandayo nokucwiliswa, futhi wabeka phambili izindlela zokwelashwa.I-PTFE ingalolongwa izinqubo ezihlukahlukene zokwenziwa kwangaphambili, njengokubunjwa, i-extrusion, i-hydraulic molding, i-push molding kanye nokucubungula okwesibili, bese i-sintered kumkhiqizo wokugcina.Ukubumba kwe-PTFE kwenziwa kakhulu nge-resin emisiwe.Lapho ubukhulu beshidi bungaphansi kuka-1.5mm, i-disperse resin isetshenziswa.Inqubo yayo yezobuchwepheshe: i-resin - isisefo (i-resin yokumiswa ngemva kokushaya ngamandla, ukuxega, kanye nesisefo se-mesh 20) - cindezela (PTFE powder ukulayisha isikhunta ngaphansi kwengcindezi esuka ku-20 kuya ku-35 MPa, ngemva kokwakhiwa kokucindezela) - sintering (ku-370 ~ 380 "C lokushisa sintering esithandweni sintering) - imikhiqizo olubunjiwe (ngaphansi isimo free ngaphakathi isikhunta noma ngemva kokupholisa ukuphothula design njengoba kudingwa ibhodi, izinduku, amashubhu, gaskets kanye nemikhiqizo ukupakisha, njll).Indlela Hydraulic ibizwa nangokuthi i- indlela yokulinganisa noma ukubunjwa kwenjoloba ekusetshenzisweni kwayo yile: faka isikhwama senjoloba endaweni - exhunywe empompini yamanzi, ukugcwalisa amanzi kukhukhumeze isikhwama senjoloba sibe yi-cylindrical - i-resin ihlanganisa ngokulinganayo phakathi kwesikhwama nokuvala isikhunta sangaphandle - qhubeka nokwandisa kancane kancane ukucindezela kwamanzi, ukugcwaliswa kwamanzi kuze kufike ku-12 ~ 13 mpa ingcindezi egcina i-30 min: ngemva kwamanzi - ukuchithwa, ukuklebhula, ukucwilisa, ukupholisa ukusetshenziswa kokubukeka okukhanyayo nokuhlanzekile.I-Push ibizwa nangokuthi i-paste extrusion molding, i-20 ~ 30 mesh sieve dispersion resin kanye noketshezi oluphilayo (njenge-toluene, i-petroleum ether, uwoyela we-solvent) ingxube engu-1:5 yokunamathisela ingxube, ilayishwa kuqala kusilinda esiwugqinsi se-billet, iphushe kusilinda esicindezelayo. , Ukushisa, nge-plunger push molding, ngemva kokumisa ku-360 ~ 380 ° C lokushisa sintering, emva kwemikhiqizo yokupholisa ibe ne-push tube eqinile, induku, njll.Ukubunjwa kwe-Extrusion kungahlukaniswa ngezinhlobo ezimbili: i-screw extrusion kanye ne-plunger extrusion.I-resin pre-sintered ngemva kokuchotshozwa nokuhlunga yengezwa kusilinda esibonakalayo.Ngokuzungezisa ngezikulufu noma ukusunduza okuphindaphindayo kwe-plunger, impahla eluhlaza ithuthelwa ku-extruder ngesikhathi esifanayo sokuminyana.
U-Wang ping wafunda inqubo yokwenza izinto zegwebu ze-PTFE.I-polytetrafluoroethylene emisiwe isetshenziswa njengempahla eluhlaza, futhi ama-hydrocarbons anuka kamnandi e-cyclic akhethwa njenge-ejenti eyenza izimbotshana.Ngemuva kokuxuba, imikhiqizo eyenziwe ngaphambili iyalungiswa futhi ifakwe.Esigabeni sokuqala se-sintering, inqubo yokomisa iyamukelwa ukuze kuphunyuke i-ejenti eyenza izimbotshana, bese kufakwa isigaba esiphikisayo.Izinto ze-Foam ezinama-dielectric constants ahlukene zingalungiswa ngezilinganiso ezihlukene ukuze zihlangabezane nezidingo ezahlukahlukene.
U-Chen xu et al.yenze ukuhlolwa kokucindezela kanye nokuhlolwa kwe-sintering ku-PTFE, yaxoxisana ngobudlelwano phakathi kokuminyana, amandla okucindezela kanye nemodulus yokucindezela, futhi yahlaziya amandla okucindezela amasampula ngaphansi kwezinqubo ezihlukene ze-sintering, futhi yathola ingcindezi yokubumba efaneleke kakhudlwana kanye nenqubo ye-sintering.Imiphumela ibonise ukuthi amandla okucindezela e-PTFE ehla ngokunyuka kokucindezela kokucindezela, futhi i-modulus yokucindezela yanda ngokunyuka kokucindezela kokucindezela.Ukucindezela kokubumba kwakungu-27.5mpa, izinga lokushisa le-sintering lalingu-380 C, futhi isikhathi sokufakelwa sasingu-4h.
Ukuze unqobe ububi be-ptfe emsulwa, njengokungazweli kahle komhuzuko kanye ne-coefficient enkulu yokwandisa ukushisa, u-Raytheon wafunda izinhlayiya ezigcwele ithusi ku-ptfe, futhi wandisa ububanzi bokusebenza be-ptfe.Ukubumba okujwayelekile kokucindezela okufudumele kwe-ptfe kubonakala ngomjikelezo omude, ukusebenza kabi, ukunemba okuphansi kwe-dimensional kanye nokushelela, kuyilapho ukubumba okufudumele kokucindezela kulolu cwaningo kunezinqubo ezimbalwa zokusebenza, umjikelezo omfushane kanye nezakhiwo ezithuthukisiwe zemishini.
Isikhathi sokuthumela: Mar-14-2017