I-PTFE high-temperature insulating gaskets yendwangu ihlanganisa amandla e-dielectric aphezulu (azinzile ngaphansi komswakama), -70°C kuya ku-260°C izinga lokushisa, ukumelana kwamakhemikhali kwendawo yonke (ngaphandle kwezinsimbi ze-alkali ezincibilikisiwe), indawo enganamathele (ivimbela i-creepage), i-anti-creep (i-fiberglass reinforcement vs. μ-fiberglass reinforcement vs. Isilinganiso somlilo we-V-0. Uma kuqhathaniswa ne-mica, irabha, nama-gaskets e-PTFE ahlanzekile, indwangu ye-PTFE inikeza ukuguquguquka okuphakeme, ukucutshungulwa, nokuzinza kobukhulu besikhathi eside. Ilungele ama-transformer, ukufakwa kwezimoto, ukuvala uphawu kwamakhemikhali, kanye nemishini ye-semiconductor.

I-PTFE indwangu flatness ngesikhathi sintering kudinga ukushuba, izinga lokushisa, nokulawula ukuzibamba. Izindlela eziyinhloko: umshini we-stenter (amapuleti amaphini agcina ububanzi, avimbele ukushwabana kwe-weft), iphrofayili yezinga lokushisa eliphansi (ukushisa kancane → 380-400°C bamba → ukupholisa kancane ngaphansi kuka-310°C ngaphambi kokukhulula ukungezwani), i-substrate eshwabene ngaphambili (isusa ukucindezeleka kokuluka ngaphambi kokumboza), kanye nogqinsi lokweluka okufanayo (ukuvimbela ukuncibilika kokuhlukana). Ukuvinjelwa kwe-Stenter kumele kugcinwe kuze kuphole ngaphansi kwephoyinti le-PTFE crystallization (cishe 310°C) ukuze kuvinjelwe i-warpage.

Ukugqoka okufanayo ngesikhathi se-PTFE emulsion impregnation yendwangu ye-fiberglass iyindlela yokuphila yekhwalithi yomkhiqizo. Izimbangela zokwemboza ngokungalingani: ukwehluleka okungeyona intonga (ukunamathela ezindaweni ezizacile), ubuthakathaka bomshini (ukugxiliswa kwengcindezi, ukudabuka), ukungazinzi kukagesi (i-voltage ehlukanayo yehla ibe ngu-1/10), ukungena kwamakhemikhali (ukugqwala kwephinifa), izinkinga zobukhulu (i-warpage), kanye nokukhubazeka kokucubungula (ukuzulazula kwebhande, ukuhlukahluka kogqinsi). Ukumbozwa okufanayo kudinga ukulawulwa okunembile kwe-emulsion viscosity, okuqukethwe okuqinile, ukungezwani kwendwangu, izikhala zokuminyanisa, kanye namaphrofayili okomisa/ama-sintering anezindawo eziningi.

Indwangu ye-PTFE enezinga eliphezulu lokushisa idlula ezigabeni ezine zoshintsho lwesakhiwo njengoba izinga lokushisa likhuphuka: ngaphansi kuka-260°C – ukuqhekeka okuncane okunensayo kanye nokuguquguquka okungeziwe okusele; ku-327 ° C (iphuzu elincibilikayo) - inguquko ye-crystalline-to-amorphous, i-coating iyathambisa, i-delaminates kusuka ku-fiberglass; 400-500°C - PTFE depolymerizes (ikhulula amagesi anobuthi), ukunamathela kuyanyamalala; ngaphezu kuka-500 ° C - i-fiberglass iyathamba (iphoyinti lokuthambisa elingu-840 ° C) futhi ilahlekelwa ubuqotho besakhiwo. Hlala ngaphansi kuka-260°C ngokuqhubekayo, gwema >300°C iziqongo ukuze usebenze ngokuphephile.

I-PTFE yokwelashwa kwendawo enezinga lokushisa eliphezulu yendwangu yephula ukungangeni kwamakhemikhali ukuze kuhlanganiswe/ukuphrinte. Izindlela ezine: ukufakwa kwamakhemikhali (i-sodium-naphthalene, amandla angaphezulu 20→ 40-50 dyn/cm, ungqimba olumnyama oluhlala njalo, isakhiwo se-micro-porous), ukwelashwa kwe-plasma (i-nano-roughening, ukuxhunyelelwa kweqembu elisebenzayo, iwindi elifushane elisebenzayo), ukwelashwa kwe-corona (ifilimu elincanyana, ukubola okusheshayo, ukujula okulinganiselwe), kanye nokwelashwa nge-laser (ukunemba kwe-micro-patterning, ukulawulwa kwe-carbonization). Zonke izindlela zenza zibe rough ngokomzimba futhi zethule amaqembu asezindaweni ezishisayo ngamakhemikhali (C=O, -OH, -COOH) ukuze kusebenze ukunamathela kokunamathelayo.

Ukuhlanzeka kwempahla eluhlaza kuyisisekelo esiyisisekelo sekhwalithi yendwangu yezinga lokushisa eliphezulu ye-PTFE. Ukungcola (iziqalisi eziyinsalela, izinto ezisetshenziswayo, ama-ion ensimbi, ama-sizing agents angcolile) kubangela ukuwohloka kokushisa ngaphambi kwesikhathi (amabhamuza, amabhamuza angaphezu kuka-260°C), izindawo ezingabambeki ezingalingani (amaphoyinti okunamathela), ukuncishiswa kokufakwa kukagesi (ukulahlekelwa yi-dielectric, ukwehla kwamandla kagesi), ukuwohloka kokushisa okuphansi, ukugxila kombala obuthakathaka, ukugxila okuphuzi kokucindezeleka, ukugxila okuphuzi. Izinto zokusetshenziswa ezimsulwa eziphezulu ziqinisekisa ukuthobela kwe-FDA, impilo ende, indwangu ye-PTFE esebenza kakhulu.

I-PTFE-coated fiberglass sintering yendwangu idinga isikhathi esinembile sokubamba ku-370-400°C. Izithando zomlilo eziqhubekayo: 30-90s (zacile) ukuya ku-3-5+ amaminithi (aminyene). Izithando zenqwaba: 5-15 min. I-under-sintering idala i-opaque, izimbotshana ezimahhadlahhadla; i-sintering ngokweqile idala ukuphuzi, ukonakala, nokukhishwa kwegesi ye-fluoride enobuthi. Ukulungiselela inqubo: sebenzisa izilandeleli zezinga lokushisa esithandweni, yenza ukuhlola okubonakalayo (okungafihli lutho, okuguquguqukayo), futhi wenze ukuhlola ukudonsa kwetheyiphu. Njalo qinisekisa ukufana kwezinga lokushisa eliwugqinsi olugcwele.

Indwangu ye-PTFE enezinga eliphezulu lokushisa idinga ukuphathwa ngokucophelela ukuze kuqinisekiswe ukuphepha nokuphila isikhathi eside. Izinyathelo zokuqapha eziyinhloko: ungalokothi udlule u-260°C (ongaphezulu kuka-320°C ukhipha intuthu enobuthi), gwema ama-crease abukhali (ukumbozwa kwemifantu, kuvezwa i-fiberglass), akukho ukuhlanzwa okulimazayo (uboya bensimbi bulimaza indawo enganamathi), gcina imvume yokunwebeka eshisayo (ivimbela ukudabuka), futhi ufake esikhundleni lapho kunebhamuza noma kuhlutshiwe. Isitolo sigoqiwe, kude ne-UV. Gqoka amagilavu ​​avikela ukushisa ngesikhathi sokuphatha.

Indwangu ye-PTFE enezinga eliphezulu lokushisa ine-coefficient of thermal expansion (CTE) engu-30-60 ppm/°C (i-warp/weft) – ephakeme kune-fiberglass iyodwa kodwa iphansi kakhulu kune-PTFE emsulwa (100-200 ppm/°C). I-PTFE ibhekana nokushintsha kwevolumu okungazelelwe (1-2%) ku-19°C no-30°C noshintsho lwesigaba. Ukuze ugweme ukugoqa, ukuklebhuka, kanye ne-delamination: ukucaciswa kwedizayini kokunwetshwa kwamahhala, gwema ukushuba ngokusebenzisa amazinga okushisa esigaba, sebenzisa ama-tensioner azenzakalelayo kumabhande okuthutha, futhi sebenzisa idizayini yokugqagqana emelene nokubhibha. Ukuhlola njalo ukugeleza okubandayo kubalulekile.

Omata bokubhaka bendwangu bezinga lokushisa eliphezulu be-PTFE banikeza izinzuzo ezine ezibalulekile: ukusebenza okungeyona intonga (akukho amafutha noma ufulawa odingekayo, amakhekhe athambile akhululwa ngokuhlanzekile), izinga lokushisa elibanzi (-70°C kuya ku-260°C, liphephile kuhhavini kuya efrijini), ukusebenziseka kabusha (izinkulungwane zemijikelezo, ukuhlanzeka kalula), ngisho nokuqhutshwa kokushisa (kuvimbela ukushiswa, ukunsundu okulinganiselwe). Ihambisana ne-FDA yebanga lokudla, ikhipha iphepha lesikhumba futhi yenza ama-silicone amacansi ngokudluliswa okungcono kokushisa kanye nokuthungwa kwendawo ecolekile.