Lesi sihloko sihlanganisa indlela yokufanisa isivinini somugqa womshini wokumboza kanye nobude be-ovini ukuze kuqinisekiswe ukunamathela kwe-organosilicone kufinyelela izinga lokuphulukisa eliqondiwe letheyiphu ye-PTFE yokushisa ephezulu. Isimiso sokufanisa esiyinhloko: isikhathi sokuhlala sisonke t_total = ubude behhavini obusebenzayo L ÷ isivinini somugqa v akumelwe sibe ngaphansi kwesilinganiso esincane esidingekayo sokwelapha. Thola izici zokwelapha nge-DSC noma ukuhlola okunamathelayo okusungula ubuhlobo 'izinga lokushisa - ubuncane besikhathi sokwelapha'. Imodeli yokwelapha eqongelelekayo elinganayo: hlukanisa i-ovini ibe izindawo, bala i-ti=Li/v kanye ne-tcure(Ti), qinisekisa ∑(ti/tcure(Ti)) ≥1. Izinqubo zokubala: setha izindawo zokushisa ezinobude uLi namazinga okushisa Ti; setha isivinini somugqa v, ubale isikhathi sokuhlala sendawo ngayinye nesilinganiso somnikelo; phinda kuze kube isamba esingu-≥1 (imajini yokuphepha engu-1.1-1.2 iyanconywa).

Lesi sihloko sihlanganisa izindlela zokulawula ukucwebezela kwe-PTFE enamathela kwindwangu ye-Teflon enezinga eliphezulu lokushisa. Ukulawulwa kwezinga lokupholisa kuqondile kakhulu futhi kusebenza ngempumelelo: Ukupholisa okusheshayo (ukucisha) ngamakhethini omoya obandayo, amarola okupholisa noma amathange amanzi - amaketanga amangqamuzana ayabanda ngaphambi kokuhlelwa oku-oda, akhe amakristalu amancane angaphelele; ukunamathela kuthambile, kuqinile ngokusebenza okuthuthukisiwe okungenanduku, ubulukhuni obuncishisiwe/ukumelana nokugqoka. Ukupholisa kancane (i-annealing) ngesigaba sokugcina ukushisa ku-10-50°C/h noma ukupholisa esithandweni - amaketanga e-molecular ahleleka ngokugcwele abe ama-spherulite amakhulu aphelele; ukugqoka kunokuqina okuphezulu, ukumelana nokugqokwa okuvelele, ubukhulu obuzinzile, ukuguquguquka okuncishisiwe kanye nokwenyuka kwe-brittleness.

Lesi sihloko sihlanganisa ukusetshenziswa kwendwangu ye-Teflon enezinga lokushisa eliphezulu ezithandweni zokushisa komoya oshisayo. Ukuba nokwenzeka: kusebenziseka njengomcamelo ongagxili kumabhande anezikhala noma amathreyi lapho izinga lokushisa lomlilo lingu-≤260°C (ukoma okunezinga lokushisa eliphansi, ukususwa kwe-binder, ukuphulukiswa kwe-slurry) — kuthuthukisa ukubhidliza nokucosha ukusebenza kahle. Kuvinjelwe ngokuqinile emazingeni okushisa aphakathi nendawo/aphezulu (300-950°C) — I-PTFE ibola ikhiphe i-HF enobuthi ne-perfluoroisobutylene, okokusebenza okugqwalile futhi kubangele ushevu obulalayo. Umgomo wokuphepha: uma izinga lokushisa lomlilo lingacacile noma lingenakuqinisekiswa ngaphansi kuka-260°C, ungasebenzisi. Izakhiwo eziyinhloko: isevisi eqhubekayo -70 ° C kuya ku-260 ° C, yesikhathi esifushane 300 ° C; ukungabi nenduku okwedlulele kanye ne-inertness yamakhemikhali; ukufakwa kahle kagesi; ukungqubuzana okuphansi (~0.04); Isisekelo se-fiberglass sinikeza amandla aphezulu okudonsa.

Lesi sihloko siqhathanisa umehluko phakathi kokushisisa ngemisebe ye-infrared kanye nezindlela zokuphulukisa zokufudumeza komoya oshisayo ekufanisweni kwesakhiwo esiphambanayo sezendlalelo zokunamathela ze-silicone. Izindlela zokudlulisa ukushisa: umoya oshisayo uncike ekuqhubeni i-convection ngokukhuphuka kwezinga lokushisa elithambile, umehluko omncane wokushisa wangaphakathi / wangaphandle; I-IR inokujula kokungena okulinganiselwe nokumuncwa okuqinile kwendawo (amashumi kuya kumakhulu ama-micrometer) okudala ukuthambekela okuphakathi nendawo kuya kwangaphakathi. Imithelela ekufaniseni kwe-crosslink: umoya oshisayo uvumela ukuphulukiswa okuvumelanayo ngaphakathi nangaphandle ngobuningi be-crosslink obufanayo; I-IR ibangela ungqimba olungaphezulu ukuthi lwakhe 'ifilimu yesikhumba' eliminyene ngokushesha evimbela ukuqhutshwa kokushisa kanye nokunyakaza kwangaphakathi kweketango, okudala ukuminyana kwe-crosslink kwehla ukusuka phezulu kuye ngaphakathi.

Lesi sihloko sihlanganisa umehluko phakathi kwe-PTFE emulsion ekhiqizwa i-polymerization yokumiswa vs ukuhlakazwa kwe-polymerization. Ukucaciswa: i-polymerization yokumiswa ayikwazi ukukhiqiza ngokuqondile i-emulsion ye-PTFE; I-emulsion ye-PTFE yangempela ivela kuphela ekuhlakazweni kwe-polymerization. 'I-emulsion yendlela yokumiswa' empeleni iwukulengiswa okunamanzi kwe-ground suspension-polymerized resin micropowder. I-Dispersion polymerization (i-emulsion eyinhloko): izinhlayiya eziyindilinga (0.1-0.3μm, ukusatshalaliswa okuncane), ezinziswe ama-surfactants ane-perfluorinated, isisindo samangqamuzana aphezulu kakhulu (>94% crystallinity), i-fibrillation eqinile, idinga i-380°C sintering ukuze yenze ifilimu eqinile eqhubekayo.

Lesi sihloko sihlanganisa indlela yokufanisa izinga lokushisa lokubola kanye nengxenye yempilo ye-peroxide crosslinking agents (BPO ne-DCP) nefasitela lenqubo yokwelapha leteyipu ye-Teflon. Idatha ebalulekile: BPO — 1-minthi uhhafu wempilo ku-~131°C, ihora elingu-1 ku-~92°C, ihora elingu-10 ku-~72°C; I-DCP — iminithi elingu-1 kokuthi ~171°C, ihora elingu-1 kokuthi ~135°C, ihora elingu-10 ku-~115°C. I-logic ehambisanayo: i-adhesive idinga i-97-99% crosslinking = 5-7 impilo yesigamu; isikhathi sokuphulukisa = 5-7 × isigamu sempilo ekushiseni okuhlosiwe. Bala emuva izinga lokushisa kusukela esikhathini sokuhlala komugqa wokukhiqiza noma ubale emuva kwesikhathi ukusuka kumazinga okushisa aphezulu avumelekile.

Lesi sihloko sifaka ububanzi besivinini somugqa ojwayelekile womugqa wokukhiqiza wendwangu we-PTFE wezinga lokushisa eliphezulu. Isivinini esijwayelekile: 2-15 m/min, ububanzi bokusebenza obuzinzile 3-8 m/min, izindwangu ezincane/imigqa yesivinini esiphezulu kufika ku-10-15 m/min. Imikhawulo ekungeneni kokungena: Indwangu kufanele igcwale ngokugcwele nge-PTFE emulsion ibe yizigaxa ze-fiber zangaphakathi - isivinini esikhulu sibangela ukungatheleleki okwanele, ukulamba kwe-resin kanye nemicu eyomile; i-emulsion viscosity, ukugxila kokuqinile, ukuminyana kwendwangu yendwangu konke kunciphisa izinga lokungena, okudinga isivinini esincane sezindwangu eziwugqinsi/eziminyene. Ukudlula kwe-Coating: amaphasi amaningi (2-6+) adingekayo ukuze kuhlanganiswe okungenasici; iphasi yokuqala ihamba kancane ukuze ibambelele, amaphasi alandelayo anganyuswa ngokulingene.

Lesi sihloko siqhathanisa umehluko phakathi kokushisisa ngemisebe ye-infrared kanye nokufudumeza komoya oshisayo ekufanisweni kwesakhiwo esiphambanayo sesendlalelo sokunamathela se-silicone. Izindlela zokudlulisa ukushisa: umoya oshisayo uyi-convection-conduction, imnene futhi iqhubekela phambili, idala i-gradient yokushisa emaphakathi; I-IR iwukumunca emisebeni okumunca indawo ejulile (ama-micrometer ukuya kumamilimitha) okudala umqansa osuka phezulu uye wangaphakathi. Imithelela ekusabalaliseni kokuminyana kwe-crosslink: Umoya oshisayo uvumela izingxenye zangaphakathi nezingaphandle ukuthi zingene ebangeni lokushisa le-vulcanization cishe ngasikhathi sinye, zinikeze ukuminyana okufanayo kwe-crosslink ngokujiya; I-IR ibangela ungqimba olungaphezulu ukuthi lwelaphe ngokushesha ukwakheka kwesikhumba esiminyene esivimba ukudluliswa kokushisa, okuholela ekwehleni kwe-gradient ebukhali yokuminyana kwe-crosslink kusuka phezulu kuya ngaphakathi.

Lesi sihloko sihlanganisa okuqukethwe kwe-silica kanye nezimo zokusetshenziswa kwendwangu yengilazi ye-silica ephezulu. Ukucaciswa kokuqukethwe kwe-silica: inkomba eyinhloko yi-SiO₂ ≥96% (i-96-98% evamile, amamaki e-premium> 99% nge-acid leaching kanye ne-sintering, isondela ku-quartz fiber ehlanzekile). Ukukhiqiza: Indwangu yengilazi ye-E iphuma i-asidi eshisayo ukuze incibilikise izingxenye ezingezona i-silica (i-boron oxide, i-sodium oxide), idale uhlaka lwamathambo oluyizimbotshana oluphezulu lwe-silica, bese lucwiliswa ukuze luminyene. Izinzuzo ezibalulekile: isevisi eqhubekayo ku-900°C endaweni ene-oxidizing, yesikhathi esifushane ngaphezu kuka-1200°C, indawo yokuthambisa eduze kuka-1700°C; ukuzinza kwamakhemikhali ngokumelene nama-acids / alkali amaningi ngaphandle kwe-HF ne-hot phosphoric acid; ukufakwa kwe-dielectric okuphansi kanye nokuqina okuzinzile emazingeni okushisa aphezulu.

Lesi sihloko sichaza izici ze-microstructural zendwangu ye-Teflon ephezulu yokushisa. I-Substrate skeleton: i-glass fiber weaving ukuthungwa kwe-plain/twill weave ene-porosity ephezulu (izimbotshana zesikali se-micron ngaphakathi kwenqwaba yefayibha kanye nasemakhaleni e-warp-weft) okunikeza isikhala sokumilela kwe-PTFE. I-Coating morphology: i-impregnation encapsulation egcwele yenza isakhiwo 'ukhonkolo oqinisiwe' lapho imicu yengilazi iyisigaba sokuqinisa, i-PTFE iyi-matrix eqhubekayo; i-surface nodular microstructure yama-nodules (izinhlayiya) ezixhunywe ama-fibrils amahle akhiwe ngesikhathi sokucwiliswa; ungqimba lwesikhumba oluminyene oluqhubekayo (okumbalwa kuya kwamashumi ama-microns awugqinsi) we-PTFE emsulwa njengesithiyo esiyinhloko sokungangeni kwamakhemikhali, izakhiwo ezinganamatheli, nokufakwa kukagesi.