Ho ea ka pono ea lintlha tse tharo tse khethollang thepa ea lihlahisoa tsa PTFE - boima ba molek'hule, crystallinity le voidage, voidage e ameha haholo ke khatello ea preforming, 'me boima ba molek'hule le crystallinity kaofela li fetoha ka maemo a fapaneng a sintering.Ka hona,sintering processmaemo a phetha karolo ea makhaola-khang litšobotsing tsa ho qetela tsa lihlahisoa tse kang ho teteana, ho thatafala, ho phunyeletsa le thepa ea mochine.
Ho ea ka pono ea lintlha tse tharo tse khethollang thepa ea lihlahisoa tsa PTFE - boima ba molek'hule, crystallinity le voidage, voidage e ameha haholo ke khatello ea preforming, 'me boima ba molek'hule le crystallinity kaofela li fetoha ka maemo a fapaneng a sintering.Ka hona, maemo a ts'ebetso ea sintering a phetha karolo ea makhaola-khang linthong tsa ho qetela tsa lihlahisoa tse kang boima, boima, ho phunyeletsa le thepa ea mechine.
Wang ping o fumane horemokhoa oa sintering oa PTFEe anngoe ke lebelo le ntseng le phahama le ho theoha, mocheso oa sintering le nako ea sintering.Ha sehlahisoa se le seholo, se fokotsa lebelo la ho phahama le ho pholile, nako e telele ea sintering.Mocheso oa sintering oa resin ea ho fanyeha o phahame ho feta oa resin ea ho hasana.Mocheso oa sintering oa lihlahisoa tse hloekileng tsa thepa o phahame ho feta oa lihlahisoa tse tlatsitsoeng.Ka kakaretso, lebelo la ho futhumala le potlakile ho feta tekanyo ea ho pholisa.Sebōping se le seng sa sintering, lisebelisoa tse hloekileng le lihlahisoa tsa ho tlatsa li ke ke tsa kopanngoa;Lihlahisoa tse nang le maemo a fapaneng a sintering li ke ke tsa tsoakoa.Lihlahisoa tsa lihlahisoa tse fapaneng tse tala li ke ke tsa tsoakoa.Ho nka tlhahiso ea 3-lera e bōpehileng chitja poleiti le bophara ba 1 m, botenya ba 20 limilimithara, habeli lera e le ptfe hloekileng le lera bohareng e le tlatsitsoe ptfe e le mohlala, matla a compression, kobang matla, ho thatafala le thepa e meng ea mechine ea selikalikoe laminated poleiti e hlahisoang ke theknoloji ena li 'nile tsa ntlafatsoa haholo.
Liu xianlan o ile a ithuta mekhoa ea ho etsa mokhoa oa ho etsa mokhoa, mokhoa oa ho etsa le mekhoa ea sebopeho sa hlobo ea PTFE, a hlahloba bofokoli le lisosa tsa lihlahisoa tsa PTFE tse hlahisoang ke ho hatelloa ha serame le ho sintering, 'me a beha pele mekhoa ea phekolo.PTFE ka bōptjoa ke mefuta e fapaneng ya dithulaganyo preforming, tse kang ho bōpa, extrusion, hydraulic molding, push molding and secondary processing, and then sintered to the final product.PTFE molding is most made of suspended resin.Ha botenya ba lakane bo le ka tlase ho 1.5mm, ho sebelisoa resin ea ho qhala.Ts'ebetso ea eona ea thekenoloji: resin - sieve (resin e emisitsoeng ka mor'a ho otla, ho lokoloha, le sieve ea 20 mesh mesh) - tobetsa (PTFE phofo e kenyang hlobo tlas'a khatello ea 20 ho ea ho 35 MPa, ka mor'a ho etsa mochine oa khatiso) - sintering (ka 370 ~ 380 "C mocheso o sintering ka sebōpi sa sintering) - lihlahisoa tse bōpiloeng (tlas'a boemo bo sa lefelloeng ka har'a hlobo kapa ka mor'a ho pholile ho phethela moralo joalokaha ho hlokoa ke boto, lithupa, li-tubes, gaskets le lihlahisoa tsa ho paka, joalo-joalo). Mokhoa oa Hydraulic o boetse o bitsoa " mokhoa o leka-lekaneng kapa ho bopeha ha rabara ts'ebetsong ea eona ea ts'ebetso ke: kenya mokotla oa rabara ka har'a lefu - o kopantsoe le pompo ea metsi, o tlatsa metsi a ruruhe mokotla oa rabara ka har'a cylindrical - resin e kopane ka mokhoa o tšoanang pakeng tsa mokotla le hlobo e koalang - tsoela pele ho eketsa butle-butle khatello ea metsi, ho tlatsa metsi ho fihlela ho 12 ~ 13 mpa khatello ea ho boloka 30 min: ka mor'a metsi - ho senyeha, ho hahola, ho sintering, ho pholile ke tšebeliso ea ponahalo e khanyang le e hloekileng.Push e boetse e bitsoa ho peista extrusion molding, 20 ~ 30 mesh sieve dispersion resin le organic liquid (joalo ka toluene, petroleum ether, the solvent oil) motsoako oa 1: 5 peista motsoako, o kenya pele ho cylinder billet e teteaneng, sutumelletsa ka har'a silinda ea compressor. , ho futhumatsa, ka plunger push molding, ka mor'a ho omisa ka mocheso oa mocheso oa 360 ~ 380 ° C, ka mor'a hore lihlahisoa tse pholileng li be le li-tube tse matla, molamu, joalo-joalo.Extrusion molding e ka aroloa ka mefuta e 'meli: screw extrusion le plunger extrusion.Resin e entsoeng esale pele ka mor'a ho senya le ho hlophisoa e kenngoa ho silinda ea thepa.Ka ho potoloha ha screw kapa push ea plunger, thepa e tala e fetisetsoa ho extruder ka nako e ts'oanang ea compaction.
Wang ping o ile a ithuta mokhoa oa ho etsa thepa ea PTFE foam.Polytetrafluoroethylene e emisitsoeng e sebelisoa e le lisebelisoa tse tala, 'me li-hydrocarbon tse monko o monate tsa cyclic li khethoa e le ntho e etsang pore.Ka mor'a ho kopanya, lihlahisoa tsa preforming li etsoa esale pele 'me li siiloe.Boemong ba pele ba sintering, mokhoa oa ho omisa o amoheloa ho etsa hore moemeli oa pore-forming a phonyohe, ebe sethaleng sa resntering se kenngoa.Lisebelisoa tsa foam tse nang le li-constants tse fapaneng tsa dielectric li ka lokisoa ka likarolo tse fapaneng ho fihlela litlhoko tse fapaneng.
Chen xu et al.e ile ea etsa tlhahlobo ea compression le teko ea sintering ho PTFE, ea buisana ka kamano e teng pakeng tsa density, compression strength le compression modulus, 'me ea hlahloba matla a khatello ea mehlala tlas'a mekhoa e fapaneng ea sintering,' me ea fumana khatello e nepahetseng ea ho bōpa le mokhoa oa sintering.Liphello li bontšitse hore matla a khatello ea PTFE a fokotsehile ka ho eketseha ha khatello ea khatello, 'me modulus ea khatello e ile ea eketseha ka ho eketseha ha khatello ea khatello.Khatello ea ho bopa e ne e le 27.5mpa, mocheso oa sintering e ne e le 380 C, 'me nako ea ho koala e ne e le 4h.
E le ho hlōla bofokoli ba ptfe e hloekileng, e kang ho hanyetsa abrasion e fokolang le coefficient e kholo ea katoloso ea mocheso, Raytheon o ile a ithuta likaroloana tse tletseng boronse ka ptfe, 'me a atolosa boholo ba kopo ea ptfe.Mofuthu o tloaelehileng oa ho hatella ptfe o khetholloa ka potoloho e telele, ts'ebetso e fokolang, ho nepahala ha maemo a tlaase le ho boreleli, ha mochine o hatellang o mofuthu thutong ena o na le mekhoa e fokolang ea ho sebetsa, potoloho e khutšoanyane le thepa e ntlafalitsoeng haholo ea mechine.
Nako ea poso: Mar-14-2017