Ukungqubuzana okuphansi kanye nokusetshenziswa kwamandla okuncane kuyizinzuzo ezibalulekile ezinikezwa ama-PTFE seal.Lezi zimpawu zingasetshenziswa ngaphandle kwezinkinga futhi nezomile ...
Naphezu kwezakhiwo zayo ezimangalisayo i-PTFE emsulwa, engagcwalisiwe noma emsulwa ayinele inani lezicelo zobunjiniyela ezidinga kakhulu.Ikakhulukazi, ukugeleza kwayo okubandayo noma ukuziphatha okukhahlamezayo kwavimbela ukusetshenziswa kwe-PTFE ezinhlelweni zemishini.Ngisho nasezingeni lokushisa lasekamelweni, i-PTFE iba nokuwohloka okukhulu ngokuhamba kwesikhathi lapho ibhekene nomthwalo oqhubekayo.Futhi, i-PTFE emsulwa ayinakho ukuqina futhi igqoka ngokushesha naphezu kwe-coefficient yayo ephansi yokungqubuzana.Ngawo-1960, ukungezwa kwezigcwalisi kwatholakala ukuthi thuthukisa inani lezinto ezibonakalayo, ikakhulukazi izinga lokukhuphuka nokuguga.Izigcwalisi eziningi zizinzile kufika ku-400 °C, ngakho-ke azikhawuli ukusetshenziswa emazingeni okushisa aphezulu.Kufakwe ohlwini ngezansi ezinye izakhi zokugcwalisa ezivamile kanye nomthelela wazo ezintweni ezibonakalayo zenhlanganisela ye-PTFE.
I-fiber yengilazi
I-Glass fiber iyisici sokugcwalisa esivame ukusetshenziswa esinomthelela omuhle ekusebenzeni kwe-PTFE, encishiswa kumazinga okushisa aphansi naphezulu.Futhi yengeza ukumelana nokugqoka futhi inikeza amandla amahle okucindezela.Lesi sengezo asisebenzi ngamakhemikhali ngaphandle kokuba khona kwe-hydrofluoric acid nezisekelo eziqinile.Inomphumela omncane ezintweni zikagesi.
Ikhabhoni kanye ne-carbon-graphite
Ikhabhoni yehlisa ukukhasa, ikhuphule ubulukhuni futhi ikhuphule ukuguquguquka okushisayo kwe-PTFE.Ukumelana nokugqoka kwezinhlanganisela ezigcwele ikhabhoni kuyathuthuka ikakhulukazi uma kuhlanganiswe negraphite.Ikhabhoni ingenye yezigcwali ezingasebenzi kakhulu ngaphandle kwasezindaweni ezine-oxidizing lapho ingilazi isebenza kangcono.Ikhabhoni inikeza ukuqhutshwa kukagesi ku-PTFE.I-PTFE egcwele ikhabhoni ivamise ukusetshenziswa ezinhlelweni zokuvala umoya womoya.Inhlanganisela nekhabhoni ehlanganiswe negraphite yizinto ezikhethwayo zezicelo ezingagcotshisiwe.
I-carbon fiber
Ukwengezwa kwe-carbon fibre ku-PTFE kushintsha izakhiwo zayo ngendlela efanayo ne-glass fiber.Yehlisa ukukhasa, ikhulise i-flex and compressive modulus futhi ikhuphule ubulukhuni.Ngokuvamile, i-carbon fiber encane kune-glass fibre iyadingeka ukuze kuzuzwe umphumela ofanayo.I-coefficient yokwandisa okushisayo iyehliswa futhi ukuhanjiswa kwe-thermal kuphezulu kumakhompiyutha we-carbon fiber egcwele i-PTFE.Izinga lokugqoka liyehla lapho izingxenye ze-carbon fiber zigcotshwa ngamanzi.I-Carbon fiber ayisebenzi ngamakhemikhali futhi ingasetshenziswa ezisekelweni eziqinile kanye ne-hydrofluoric acid.
I-graphite
I-graphite iwukuguqulwa kwecrystalline kwekhabhoni emsulwa kakhulu.I-PTFE egcwele i-graphite ine-coefficient eyodwa ephansi kakhulu yokungqubuzana ngenxa yezici eziphansi zokungqubuzana kwe-graphite.Inezinto zokuguga ezinhle kakhulu, ikakhulukazi ezindaweni ezithambile zokukhwelana futhi ikhombisa amandla aphezulu okuthwala imithwalo ezinhlelweni zokuthintana ezinesivinini esikhulu.I-graphite i-inert yamakhemikhali eyenza ukusetshenziswa kwayo kumidiya egqwalayo.
Ithusi
I-bronze iyisigcwali esivamile se-metallic.Inani elikhulu (40 kuya ku-60 % ngesisindo) lethusi linciphisa ukuwohloka ngaphansi komthwalo futhi likhuphule ukuguquguquka okushisayo nokukagesi kwezinhlanganisela ze-PTFE.Lezi zici ezimbili zinenzuzo ezinhlelweni zokusebenza lapho ingxenye ilayishwa emazingeni okushisa aphezulu.I-PTFE egcwele ithusi inikeza izici ezinhle kakhulu zokumelana ne-extrusion.I-bronze iyingxube yethusi nethini futhi ingahlaselwa amakhemikhali athile.I-oxidation yethusi ingaholela ekushintsheni kombala kwengxenye eqediwe ngaphandle kokuba nomthelela kwikhwalithi yomkhiqizo.I-PTFE egcwele ithusi isetshenziswa kakhulu ku-hydraulic rod ne-piston seal izicelo.
I-Molybdenum disulfide (MoS2)
I-Molybdenum disulphide inyusa ubulukhuni nokuqina kwe-PTFE ngenkathi inciphisa ukungqubuzana.Inomphumela omncane ezicini zayo zikagesi.Ngokwekhemikhali, ayisebenzi futhi incibilika kuphela kuma-acid oxidizing aqinile.Ivame ukusetshenziswa kumaphesenti amancane esisindo futhi ihlanganiswe nezinye izigcwalisi ezifana ne-glass fiber.
I-polyester enephunga elimnandi
I-polyester enuka kamnandi njenge-filler element iphakamisa ukumelana nezinga lokushisa okuphezulu kwe-PTFE futhi inhle kakhulu ekusebenziseni ezindaweni zokukhwelana ezithambile, eziguqukayo.Ayinconyelwe ukuvala izinhlelo zokusebenza ezifaka isitimu esingaphezu kuka-120 °C.
Izithasiselo zombala
Kungenzeka ukwenza umbala we-PTFE ngokusebenzisa izithasiselo zombala wezinto ezingaphili ezimelana nezinga lokushisa elishisayo le-PTFE.Izingulube azishintshi kakhulu izakhiwo ze-PTFE.Inhlanganisela yombala nezinye izigcwalisi ziyenzeka.Izihlungi zobunikazi kanye nezinhlanganisela zokugcwalisaI-Parker ilwela ngokuqhubekayo ukucinga kanye nokuthuthukisa imixube eyingqayizivele kanye nokwakheka ukuze kuthuthukiswe ukusebenza kokuvala ezinhlelweni ezidlulele kakhulu.
Isikhathi sokuthumela: Aug-16-2016