Ukusuka kwimbono yezinto ezintathu ezimisela iimpawu zeemveliso ze-PTFE - ubunzima bemolekyuli, i-crystallinity kunye ne-voidage, i-voidage ichaphazeleka kakhulu luxinzelelo lwe-preforming, kunye ne-molecular weight and crystallinity yonke inguqu kunye neemeko ezahlukeneyo ze-sintering.Ngoko ke,inkqubo sinteringiimeko zidlala indima eqinisekileyo kwiipropati zokugqibela zeemveliso ezifana nokuxinana, ukuqina, ukunyamezela kunye neempawu zoomatshini.
Ukusuka kwimbono yezinto ezintathu ezimisela iimpawu zeemveliso ze-PTFE - ubunzima bemolekyuli, i-crystallinity kunye ne-voidage, i-voidage ichaphazeleka kakhulu luxinzelelo lwe-preforming, kunye ne-molecular weight and crystallinity yonke inguqu kunye neemeko ezahlukeneyo ze-sintering.Ke ngoko, iimeko zenkqubo ye-sintering zidlala indima eqinisekileyo kwiipropathi zokugqibela zeemveliso ezinje ngoxinaniso, ukuqina, ukunyanzeliswa kunye neempawu zoomatshini.
Wang ping wafumanisa ukubainkqubo sintering ye PTFEyachatshazelwa kukunyuka nokuhla kwesantya, ubushushu be-sintering kunye nexesha le-sintering.Imveliso enkulu, iyacotha isantya sokunyuka kunye nokupholisa, ixesha elide le-sintering.Ubushushu be-sintering ye-resin yokunqunyanyiswa buphezulu kune-dispersion resin.Ubushushu be-sintering yeemveliso ezihlambulukileyo zezinto eziphathekayo ziphezulu kuneemveliso ezizaliswe.Ngokuqhelekileyo, izinga lokufudumala likhawuleza kunomlinganiselo wokupholisa.Kwisithando somlilo esifanayo, izinto ezicocekileyo kunye nemveliso yokuzalisa ayinakuxutywa;Iimveliso ezineemeko ezahlukeneyo ze-sintering azikwazi ukuxutywa.Iimveliso zezixhobo ezahlukeneyo azikwazi ukuxutywa.Ukuthatha imveliso ye-3-layer ebunjiweyo yepleyiti esetyhula kunye nobubanzi be-1 m, ubukhulu be-20 mm, umaleko ophindwe kabini njenge-ptfe ecocekileyo kunye nomaleko ophakathi njengoko uzaliswe ptfe njengomzekelo, amandla oxinzelelo, amandla okugoba, ubulukhuni kunye nezinye iimpawu zomatshini ipleyiti elaminethiweyo setyhula eveliswe le teknoloji iye yaphuculwa kakhulu.
U-Liu xianlan wafunda iimpawu zenkqubo yokubumba, indlela yokwenza kunye neempawu zoyilo lomngundo we-PTFE, wahlalutya iziphene kunye nezizathu zeemveliso ze-PTFE eziveliswa ngokucinezela okubandayo kunye nokutshiza, kwaye wabeka phambili iindlela zonyango.I-PTFE inokubunjwa ngeentlobo ngeentlobo zeenkqubo zangaphambili, ezifana nokubumba, ukukhupha, ukubunjwa kwe-hydraulic, ukubunjwa kokutyhala kunye nokulungiswa kwesibini, kwaye emva koko i-sintered kwimveliso yokugqibela.Xa ubukhulu bephepha bungaphantsi kwe-1.5mm, i-disperse resin isetyenziswa.Inkqubo yayo yezobuchwepheshe: i-resin - i-sieve (i-resin yokumisa emva kokubethelwa, ukukhululeka, kunye ne-20 mesh mesh sieve) - cinezela (PTFE powder ukulayisha isikhunta phantsi koxinzelelo ukusuka kwi-20 ukuya kwi-35 MPa, emva kokwenza i-press compaction) - i-sintering (kwi-370 ~ 380 "C iqondo lobushushu sintering kwi sintering eziko) - iimveliso ezibunjiweyo (phantsi kwemeko simahla ngaphakathi komngundo okanye emva kokupholisa ukugqiba uyilo njengoko kufunwa yibhodi, iintonga, iityhubhu, iigaskets kunye neemveliso zokupakisha, njl. njl.).Indlela yeHydraulic ikwabizwa ngokuba yi-Hydraulic indlela yokulinganisa okanye ukubumba irabha kwinkqubo yayo yokusebenza yile: faka ibhegi yerabha kwi-die - eqhagamshelwe kwimpompo yamanzi, ukugcwalisa amanzi ukudumba ibhegi yerabha kwi-cylindrical - i-resin ngokulinganayo ukujoyina phakathi kwebhegi kunye nokuvalwa kokungunda kwangaphandle - qhubeka nokwandisa kancinci uxinzelelo lwamanzi, ukuzaliswa kwamanzi ukuya kwi-12 ~ 13 mpa uxinzelelo olugcina i-30 min: emva kwamanzi - ukuchithwa, ukukrazula, ukupholisa, ukupholisa kukusetyenziswa kokubonakala okuqaqambileyo nokucocekileyo.Ukutyhala kukwabizwa ngokuba kukubunjwa kwe-paste extrusion, 20 ~ 30 mesh dispersion resin kunye ne-organic liquid (efana ne-toluene, i-ether yepetroleum, i-oyile yokunyibilikisa) umxube 1:5 paste umxube, ulayishe kwangaphambili kwibillet eshinyeneyo eludongeni, tyhala kwi-compressor cylinder. , ukufudumeza, kunye ne-plunger push molding, emva kokumisa kwi-360 ~ 380 ° C ukushisa kwe-sintering, emva kweemveliso zokupholisa zine-tube eqinile yokutyhala, intonga, njl.I-resin yangaphambili ye-sintered emva kokutyumzwa kunye nokuhluzwa yongezwa kwi-cylinder yezinto eziphathekayo.Ngokujikeleziswa kwesikrufu okanye ukutyhala okuphindaphindayo kweplunger, imathiriyeli ekrwada ithuthwa isiwe kwi-extruder ngexesha elinye lokuxinana.
UWang ping wafunda inkqubo yokwenza izinto ze-PTFE zogwebu.I-polytetrafluoroethylene enqunyanyisiweyo isetyenziswa njengemathiriyeli ekrwada, kwaye ii-hydrocarbons eziqholiweyo ze-cyclic ezinevumba elimnandi zikhethwa njenge-arhente eyenza i pore.Emva kokuxuba, iimveliso zangaphambili zilungiswa kwaye zifakwe.Kwinqanaba lokuqala le-sintering, inkqubo yokomisa iyamkelwa ukwenza i-pore-forming agent abaleke, kwaye emva koko inqanaba lokurhoxa lingeniswa.Izixhobo ze-foam ezine-dielectric constants ezahlukeneyo zinokulungiswa ngokwemilinganiselo eyahlukeneyo ukuhlangabezana neemfuno ezahlukeneyo.
UChen xu et al.iqhube uvavanyo loxinzelelo kunye novavanyo lwe-sintering kwi-PTFE, yaxoxa ngobudlelwane phakathi koxinzelelo, amandla oxinzelelo kunye nemodyuli yoxinzelelo, kwaye yahlalutya amandla oxinzelelo lweesampulu phantsi kweenkqubo ezahlukeneyo ze-sintering, kwaye yafumana uxinzelelo olufanelekileyo lokubumba kunye nenkqubo ye-sintering.Iziphumo zibonise ukuba amandla oxinzelelo lwe-PTFE ancipha ngokunyuka koxinzelelo, kwaye imodyuli yoxinzelelo yanda ngokunyuka koxinzelelo.Uxinzelelo lokubumba lwaluyi-27.5mpa, ubushushu be-sintering yayingu-380 C, kwaye ixesha lokugquma laliyi-4h.
Ukuze boyise izinto ezingeloncedo ze-ptfe esulungekileyo, ezifana nokunganyangeki kwe-abrasion kunye nokwanda kwe-thermal coefficient, uRaytheon wafunda amasuntswana azaliswe lubhedu kwi-ptfe, kwaye wandisa umda wesicelo se-ptfe.I-ptfe yokubunjwa okufudumeleyo eqhelekileyo ibonakaliswa ngumjikelo omde, ukusebenza kakubi, ukuchaneka komgangatho ophantsi kunye nokugudiswa, ngelixa ukubunjwa okufudumeleyo kolu phando kuneenkqubo ezimbalwa zokusebenza, umjikelo omfutshane kunye nokuphucula kakhulu iimpawu zoomatshini.
Ixesha lokuposa: Mar-14-2017