I. Ukulawulwa Okunembile Kwezinga Lokupholisa
Abakhiqizi bendwangu ye-Teflon ephezulu yokushisa bakhomba ukuthi ukulawulwa kwezinga lokupholisa kuyindlela eqondile nephumelelayo yokulawula ubucwebe. Ngemuva kokuthi i-PTFE isincibilike ngokuphelele ngaphezu kuka-380°C, amaketanga emolekyuli ahlela abe yikristalu lapho edlula ebangeni eliphezulu lezinga lokushisa lekristalu elingu-310~315°C ngesikhathi sokupholisa. Izinga lokupholisa linquma ingxenye yesifunda sekristalu kanye ne-microscopic morphology yokunamathela.
1. Ukupholisa okusheshayo (ukucisha) kokucwebezela okuphansi
Indawo yendwangu ene-sintered ipholiswa ngokushesha ngamakhethini omoya obandayo, amarola okupholisa noma amathange amanzi anezinga lokushisa elivamile. Amaketanga amangqamuzana aba yiqhwa ngaphambi kokuhlelwa okujwayelekile nokuhlelekile, okwenza inani elikhulu lezinhlamvu zekristalu ezincane nezingaphelele. I-coating etholiwe ifaka ukuthungwa okuthambile kanye nokuqina okuhle kakhulu ngokusebenza okuthuthukisiwe okungeyona intonga, kuyilapho ukuqina kwayo nokumelana nokugqokwa kwehliswa kancane.
2. Ukupholisa okunensayo (i-annealing) ngokucwebezelayo okuphezulu
Ingxenye yokulondoloza ukushisa ihlelwa lapho kuphuma khona isithando somlilo, noma indwangu ipholiswa ngesithando somlilo ngenani eliphansi kakhulu lika-10~50°C/h. Lokhu kuvumela ukunyakaza okwanele kwamaketanga amangqamuzana akhe ama-spherulite amakhulu futhi aphelele. I-coating iqhosha ngokuqina okuphezulu, ukumelana nokugqokwa okuvelele kanye nokuzinza kwe-dimensional, nokho ngokuguquguquka okuncishisiwe kanye nokwenyuka kokuqina.
II. Inqubo Esizayo Nokulawula Okubalulekile
Ngokwesisekelo sokulawulwa kwezinga lokupholisa, izinyathelo ezilandelayo ezisizayo zingathuthukisa ukucwebezela kokunamathela kwe-PTFE.
1. Izinga lokushisa le-Sintering kanye nesikhathi sokubamba
Izinto ezisetshenziswayo kufanele zishiswe zibe ngu-380 ~ 400 ° C futhi zibanjwe isikhathi esanele ukuze zincibilike ngokuphelele amakristalu okuqala futhi kuqedwe umlando wokushisa. I-sintering enganele izoshiya i-crystal nuclei eyinsalela, okuholela ekukhanyeni kokugcina okuphakeme kakhulu nokusatshalaliswa ngokulinganayo.
2. Ukukhipha isisu ngemva kokwelashwa
Ngezingubo ezine-crystallinity ephansi etholwe ukupholisa okusheshayo, ukukhula kwekristalu yesibili kanye nokuqedwa kokucindezeleka kwangaphakathi kungabonakala ngokwelashwa okuhlala njalo kwezinga lokushisa ku-300 ~ 320 ° C amahora ambalwa okulandelwa ukupholisa kancane, okwandisa ngokulinganisela i-crystallinity yokumboza.
3. Isisindo samangqamuzana aluhlaza
I-PTFE enesisindo esikhulu samangqamuzana ukuhlakazwa kuhlanganisa i-viscosity ephezulu yokuncibilika kanye nokuhamba okuphansi kweketango lamangqamuzana, okuholela kuzinga lokucwebezela kancane. Ngaphansi kwezimo zokupholisa ezifanayo, kulula ukulungiselela ukugqoka nge-crystallinity ephansi.
4. Ukwengezwa kwe-agent ye-nucleating
Umthamo omncane (0.1%~1%) wezigcwalisi ze-inorganic noma ama-copolymers ane-perfluorinated angahlinzeka ngenani elikhulu le-heterogeneous crystal nuclei futhi icwenge kakhulu izinhlamvu zekristalu. Yize ingeke iguqule kakhulu ubucwebe buphelele, ithuthukisa kahle i-crystal microstructure.
III. Ukuphathwa Okuphelele Kokukhiqizwa Kwezingqimba Eziningi
Indwangu yokushisa ephezulu ye-Teflon ikhiqizwa izinqubo eziningi zokufakelwa kanye ne-sintering enezingubo eziqoqwe kancane kancane, ezidinga ukulawulwa kwenqubo ehlosiwe kanje.
1. I-Interlayer crystallization consistency
Umehluko omkhulu ngokwedlulele esilinganisweni sokupholisa phakathi kwezendlalelo kuzodala ukucwebezela kwe-interlayer okungahambisani futhi kudale ingcindezi yangaphakathi, kuze kuholele ekuxebukeni kwe-coating ezimeni ezinzima. Kunconywa ukuthi usebenzise ukupholisa okumaphakathi kwezendlalelo ezimaphakathi, futhi usebenzise ukupholisa okuhlosiwe okusheshayo noma okunensayo kuphela kwesendlalelo esingaphandle ngokuya ngezidingo zokukhiqiza.
2. Umphumela wokujiya we-coating
Izingubo eziwugqinsi zihlushwa ukupholisa okungavumelani phakathi koqweqwe olungaphezulu nolwengaphakathi. Isendlalelo sangaphakathi sivame ukwakha ubucwebe obuphezulu ngenxa yokushabalaliswa kokushisa okunensayo. Kuyadingeka ukwelula ngokufanelekile isikhathi sokupholisa ukuze kuqinisekiswe izinga lokushisa elifanayo layo yonke into ngaphambi kokusebenzisa izinqubo zokupholisa ezihlanganisiwe.
3. Ukufanisa ukucindezeleka ngesikhathi sokupholisa
Ukungezwani okusetshenziswa endaweni yendwangu ngesikhathi sesigaba sokupholisa kuthinta ukuma kwamaketanga wamangqamuzana, imibhangqwana enenqubo ye-crystallization futhi inquma ngokuhlanganyela i-crystal morphology yokugcina nokuzinza kwe-dimensional. Ukulawula okudidiyelwe nokunembayo kuyisibopho.
IV. Ukutholwa Okulinganiselwe kwe-Crystallinity
I-Differential Scanning Calorimetry (DSC) kufanele yamukelwe ukuze kuqinisekiswe ubucwebe ngemva kokulungiswa kwenqubo. Isampula ye-coating ye-5 ~ 10mg ishisa ngenani le-10 ° C / min ukuze kuhlolwe i-enthalpy encibilikayo. I-crystallinity ibalwa ngokuhlukanisa i-enthalpy encibilikayo ehloliwe nge-enthalpy encibilikayo yethiyori engu-100% crystalline PTFE (cishe 82J/g). Kuhlanganiswe nokumelana nokugoba, ukumelana nokugqoka nokunye ukuhlolwa kokusebenza, iwindi lenqubo elilungile linganqunywa.
Izimiso Zokusebenza Okujwayelekile : Ukuze uthole ubucwebe obuphansi, sebenzisa ukucisha ngokushesha ngemva kokushisa okugcwele; ukuze uthole ukucwebezela okuphezulu, gcina izinga lokushisa elingaguquki lisondele ku-310°C okulandelwa ukupholisa okuhamba kancane kakhulu ngemva kokucwenga okugcwele.
Okuqukethwe okungenhla kwezobuchwepheshe kunikezwa ngu I-Jiangsu Aokai New Material Technology Co., Ltd.
Ukuze uthole ulwazi olujulile mayelana nemingcele enemininingwane, izimo zohlelo lokusebenza nezixazululo ezenziwe ngokwezifiso zohlu lwethu olugcwele lwemikhiqizo ehlanganisa indwangu ye-Teflon eshisa kakhulu, itheyiphu enamathela ye-Teflon ephezulu lokushisa, ibhande le-Teflon high-temperature mesh, ibhande lomshini wokubopha elingenamthungo, indwangu ye-PTFE enohlangothi olulodwa, indwangu engamelana nokushisa okuphezulu kwe-fiberglass, sicela umelane nezinga lokushisa eliphezulu zizwe ukhululekile ukuxhumana nathi ku-inthanethi noma uxhumane nenombolo yethu yocingo yesevisi.
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