A fadi-zazzabi-kewaye Tef ɗin PTFE dole ne ya haɗa dogaro da dogaro a -70°C (ko ƙasa) kuma ya tsira ci gaba da fallasa a 200-260°C – tazarar sama da 300°C. Wannan yana buƙatar tsarin mannewa wanda ya kasance mai sassauƙa ba tare da gazawar haɗin kai ba ko ɓarɓarewar fuska a kowane matsananci.
Layer na mannewa yawanci manne ne na musamman na silicone-m (PSA) mai rufi akan fina-finan PTFE da aka gyara ko kuma masana'anta na fiberglass na PTFE. Makullin aiki mai tsayi a cikin irin wannan taga mai faɗin zafin jiki yana cikin gina hanyar sadarwa mai daidaitawa - ƙirar da ke daidaita jika mai ƙarancin zafin jiki, juriya mai zafi mai zafi, da juriyar girgiza zafi.
Aokai PTFE ya haɓaka kaset ɗin PTFE masu faɗin zafin jiki ta amfani da ka'idodin da aka bayyana a ƙasa. Wannan labarin yana bayanin abubuwan ƙira huɗu masu mahimmanci: tsarin canjin canjin yanayi, microstructure biphasic tsibirin teku, ƙetare gradient, da daidaitawar abubuwan da ke tattare da zafi.
Tsarin Tsarin Juyin Juya Tsakanin Substrate da Layer Adhesive
1. Babban kalubale - PTFE surface makamashi
PTFE yana da ƙarancin kuzarin ƙasa (18-20 dynes/cm). Rufe kai tsaye na manne yana ƙoƙarin barewa yayin hawan keken zafi saboda rashin daidaituwar haɓaka haɓakawar thermal - PTFE yana faɗaɗa 30-40x fiye da fiberglass.
2. Kunna sararin sama da ɗorawa na farko
Don magance wannan, PTFE surface yana jurewa sinadarai etching tare da sodium-naphthalene complexes ko plasma magani don gabatar da C = C biyu shaidu da kuma oxygen-dauke da polar kungiyoyin. Bayan haka, ana amfani da ƙwaƙƙwaran siliki mai ƙwanƙwasa (misali, wakilin silane mai ƙunshe da vinyl) don samar da 'gadar kwayoyin halitta' a mahaɗin ta hanyar haɗin sinadarai.
3. Matsakaicin damuwa-buffering interlayer
A wasu ƙayyadaddun tsari, an saka ƙaramin-modulus, babban ductility na roba matsakaici Layer (gel-kamar silicone tare da sassa masu sassauƙa) tsakanin Layer ɗin da aka kunna da babban manne. Wannan yana ɗaukar damuwa na tsaka-tsakin fuska wanda ke haifar da canjin zafin jiki mai kaifi kuma yana hana ɗaukar gefen abin mannewa.
Babban matrix na mannewa shine tsarin PSA na yau da kullun wanda ya ƙunshi guduro silicone MQ (tsawon tsibiri mai tarwatsewa) da polysiloxane mai nauyin nauyin kwayoyin halitta (ci gaba da yanayin teku).
1. MQ silicone guduro - wuya tsibirin lokaci
Yana ba da haɗin kai, riƙe ƙarfi, da juriya mai zafi mai zafi. Madaidaicin iko na rabon molar sa na M/Q (yawanci 0.6-0.9) da rarrabuwar barbashi yana tabbatar da shigar da kayan aiki cikin ci gaba don samar da rukunin yanar gizo na crosslinking.
2. Polysiloxane ci gaba da lokaci - lokaci mai laushi na teku
Yana ba da maƙarƙashiya mai sauri, ƙarancin zafin jiki, da sassauci. Babban nauyin kwayoyin methyl vinyl silicone roba ko methyl phenyl vinyl silicone roba yawanci ana zaba.
3. Ingantawa na musamman don kewayon zafin jiki mai faɗi
ƙaramin adadin siloxane mai girma-phenyl-abun ciki . An haɗa Ƙungiyoyin Phenyl suna hana ƙananan zafin jiki crystallization na polydimethylsiloxane, suna rage yawan zafin jiki na mannewa a ƙasa -100 ° C. A halin yanzu, ƙungiyoyin phenyl suna haɓaka juriya na lalatawar thermal-oxidative a babban yanayin zafi, yana ba da damar ci gaba da yanayin teku don riƙe babban elasticity a saman taga yanayin zafi mai faɗi.
Multi-Layer ko Gradient Crosslinking Design for thermal Shock Resistance
Ana ɗaukar tsarin shafi mai Layer biyu don daidaita juriya mai zafi mai zafi da ƙarancin zafin jiki:
1. Inner Layer (gefen substrate)
Dangantakar girman girman giciye , isar da ƙarfi mai ƙarfi mai ƙarfi da ƙarfin haɗin kai azaman tsarin juriya mai ƙarfi.
2. Layer na waje (sabo da haɗin gwiwa)
Matsakaicin ƙarancin haɗin giciye tare da sarƙoƙi na ƙwayoyin hannu sosai, yana tabbatar da saurin jikewa a kan madaidaicin yanayin zafi da isasshiyar maƙarƙashiyar farko.
A madadin, ci gaba da gradient mai yawa na crosslink daga ciki zuwa waje yana samuwa a cikin Layer guda ɗaya ta hanyar hanyoyin magancewa, ba tare da lahani ba tare da haɗaɗɗun sassan aiki masu sassauƙa.
Aokai PTFE yana amfani da fasahar haɗin gwiwar gradient don tabbatar da cewa tef ɗin ya kasance mai sassauƙa a -70 ° C (yana ba da damar tack na farko da daidaitawa) yayin da yake riƙe ƙarfin haɗin gwiwa a 260 ° C (hana zazzagewa da canja wurin m).
Zafi-Tsarin Haɗaɗɗen Fillers
Nano-sikelin fumed silica an watse sosai a cikin matrix na manne don ƙarfafawa, haɗe da nau'i biyu na kayan aikin aiki:
1. Abubuwan da ke jure zafi
Cerium oxide, baƙin ƙarfe oxide, da sauran m scavengers hana oxidative hardening na siloxane gefen sassan da lalata kashin baya karkashin zafi mai zafi. Wadannan antioxidants suna tsawaita rayuwar sabis a 260 ° C.
2. Thermal conductive fillers
Micron-sized aluminum nitride, alumina , da dai sauransu, da sauri watsar zafi don rage yawan zafin ciki na ciki da kuma rage tsufa. Wannan yana da mahimmanci musamman ga aikace-aikace inda ake amfani da tef ɗin azaman mahaɗar yanayin zafi ko kuma inda haɓakar zafi daga ma'aunin zai iya ƙara lalata mannewa.
Duk abubuwan da ake amfani da su suna buƙatar wuce gona da iri ko jiyya na silane don guje wa hawan moduloli da yawa da taurin mannewa a ƙananan yanayin zafi.
Takaitawa – Cibiyar Sadarwar Sadarwar Daidaitawa don Matsanancin yanayi
Maɗaukakiyar kaset ɗin PTFE mai faɗin-zazzabi shine ainihin ƙari na platinum-catalyzed ƙari na ƙetare hanyar sadarwar microphase-rarrabuwa wanda aka saka tare da rukunin rukunin resin sinadarai na MQ da matasan phenyl dogon sarkar siloxanes. Ta hanyar haɗin kai na gradient da fasahar haɗin gwiwa, yana haɓaka daidai:
Rike da sauri da kuma babban sassauci a ƙananan yanayin zafi
Ƙarfin haɗin kai da aikin anti-oxidation a babban yanayin zafi
...a cikin Layer na roba na roba guda ɗaya, yana saduwa da buƙatun aikace-aikacen matsakaicin matsakaicin zafin jiki.
Aokai PTFE yana kera kaset na PTFE masu zafin jiki ta amfani da wannan ƙirar tsarin mannewa. Ƙididdiga na al'ada - gami da kauri, gradient crosslink, da filler - suna samuwa don takamaiman bukatun aikace-aikacen.
Idan kuna son koyan cikakkun bayanai dalla-dalla, yanayin aikace-aikacen da mafita na musamman don cikakken jeri na samfuranmu, gami da yadudduka masu zafin jiki na PTFE, kaset ɗin PTFE, PTFE raga mai ɗaukar bel, bel ɗin injin fusing mara ƙarfi, PTFE mai gefe guda ɗaya mai rufi, babban zafin jiki mai jurewa isar da bel da tashar fiberglates da ke ƙasa
