PTFE high-zazzabi zane ne yadu amfani da lantarki rufi a waya harnessing, transformer yadudduka, motor windings, da high-mita da'irori. Amma yanayin zafi yana canzawa - daga sanyi mai sanyi zuwa matsananciyar zafi - yana canza halayen sa na rufewa. Za ku iya dogara da rigar PTFE a 200 ° C? Me ke faruwa sama da 260°C?
Amsar tana da ban mamaki. Tsarin kwayoyin halitta na PTFE yana ba shi ingantaccen rufi a cikin mafi yawan kewayon aiki, amma wuce 260°C yana haifar da lalacewa mara jurewa. Kuma yayin da yanayin sanyi ya inganta kayan lantarki, suna sa suturar ta lalace.
Aokai PTFE ya gwada kaddarorin rufewa a cikin iyakar zafin jiki. Wannan labarin ya rushe aikin zuwa jeri uku: aiki na yau da kullun (-180 ° C zuwa 260 ° C), matsananciyar girma (> 260 ° C), da ƙananan zafin jiki (<0 ° C), tare da mahimman bayanai akan tsayayya, ƙarfin dielectric, da abubuwan da suka dace.
Matsayin Aiki na yau da kullun: -180°C zuwa 260°C – Insulation mai ƙarfi
A cikin wannan ikon, PTFE high-zazzabi zane yana kula da fice da kuma barga lantarki rufi - a core fa'ida goyon bayan tartsatsin masana'antu aikace-aikace.
1. Volume & Surface Resistivity
Zazzabi
Juyin ƙarar (Ω·cm)
Ma'ana
Yanayin yanayi (25°C)
10⊃1;⁷ - 10⊃1;⁸
Madalla - daga cikin mafi kyawun insulators
200°C
10 ⊃1; 3; - 10 ⊃ 1;
Har yanzu yana da nisa fiye da yawancin kayan yau da kullun
260°C
10⊃1;⊃2; (kimanta)
Har yanzu yana aiki don aikace-aikace da yawa
Mechanism: Resistivity yana raguwa da matsakaici tare da hauhawar zafin jiki saboda mafi girman zafin jiki yana ƙarfafa motsin zafi na sarƙoƙi na kwayoyin PTFE kuma yana haɓaka ƙaura na masu dako na ƙazanta. Duk da haka, ko da a 200 ° C, PTFE ya fi yawancin robobin injiniya a zafin jiki.
Bayanan kula akan juriya na saman: Juriya na saman yana da saurin kamuwa da zafi na yanayi. PTFE kusan ba hygroscopic ba ne; Danshin saman yana ƙafewa a yanayin zafi mai tsayi, yana samar da ingantaccen rufin saman sama fiye da yanayin ɗaki mai tsananin ɗanshi.
2. Ƙarfin Dielectric (Ƙarfin Wutar Lantarki)
Yana raguwa yayin da zafin jiki ya tashi. Ƙunƙarar motsin zafin jiki na kwayoyin halitta yana sa kayan ya zama mafi haɗari ga lalacewar filin lantarki.
Daga zafin jiki zuwa 200 ° C, ƙarfin dielectric na ɗan gajeren lokaci yana faɗi da kusan 20% -40%.
Ko da haka, rigar ƙira mai kauri mai kauri 0.1 mm har yanzu tana jure wa kilovolts da yawa (ko dubun kilovolts don mafi girman maki) a 200°C - ƙarfin rufewa mai ƙarfi yana riƙe.
Me ya sa wannan ya shafi: PTFE's sosai m tsarin kwayoyin halitta da matsananci-low polarization garanti barga watsa sigina da matsananci-ƙananan zafi samar karkashin high-mita & high-zazzabi sabis. Wannan ya cancanci PTFE azaman madaidaicin abin rufe fuska mai ƙarfi don aikace-aikacen RF da microwave.
Aokai PTFE babban zane mai zafin jiki an kayyade shi ta abokan ciniki don babban juzu'in mai canzawa saboda kwanciyar hankali Dk (2.05 ± 0.05) da tanδ ultra-low (0.0002-0.0005) a cikin kewayon -50 ° C zuwa 200 ° C. Muna ba da rahotannin gwajin kadarorin dielectric akan buƙata.
Matsakaicin Maɗaukakin Zazzabi: Sama da 260 ° C - Lalacewar da ba za a iya jurewa ba
Wuce zafin sabis na halal na dogon lokaci na PTFE yana haifar da lalacewar jiki da sinadarai mara jurewa - ba bambancin kadarori ba.
Yanayin Zazzabi
Jiha Material
Matsayin Insulation
260°C – 327°C
PTFE shafi yana laushi; Ƙarfin injiniya ya ɓace sosai. Danniya na waje ko nauyin lantarki cikin sauƙi yana haifar da lalacewar shafi da huda → haɗakar gazawar injin-lantarki ko da mahimman sigogin lantarki sun kasance abin karɓa
Ba abin dogaro - haɗarin huda
Sama da 327 ° C
Ya isa wurin narkewar crystalline na PTFE. M PTFE yana jujjuya zuwa babban-lastic ko gel jihar, rasa daidaiton tsari
Kusan gaba ɗaya ya gaza
Sama da 400 ° C
Tsananin bazuwar zafi yana fitar da iskar gas mai haɗari. Carbonization da conductive wurare suna samuwa a cikin abu → juriya juriya ya ragu sosai, rufin ya lalace har abada
Cikakkun gazawar – hanyoyin da za a bi
Gargaɗi mai mahimmanci: Kodayake masana'anta fiberglass ɗin tushe suna jure wa 550-750 ° C kafin yin laushi, gilashin fiberglass ɗin da ba a rufe su ba da sauri yana ɗaukar danshi bayan gazawar shafi na PTFE kuma ba zai iya yin hidima da kansa don rufin wutar lantarki ba.
Ƙaruwa - ƙananan zafin jiki yana kulle motsi sarkar kwayoyin halitta, yana hana ƙaura mai ɗauka
Rufin wutar lantarki ya fi a zafin jiki
Dielectric ƙarfi
Ƙara - abu mafi juriya ga rushewa
Mafi kyau ga aikace-aikacen rufin cryogenic
Samfuran injina
PTFE yana jure wa canjin lokaci na crystal a ~ 19 ° C; ya zama ƙasa da ƙasa -79 ° C
Lankwasawa ko tasiri na iya fashe shafi na PTFE → yana haifar da lahani
Key takeaway: Duk da inganta lantarki rufi a low yanayin zafi, da PTFE shafi zama gaggautsa. Don aikace-aikacen cryogenic (misali, layukan nitrogen na ruwa, maɗaukaki masu ɗaukar nauyi), tabbatar da cewa ba a fuskantar rigar ga kaifi mai kaifi ko damuwa na inji ƙasa -79°C. Da zarar an fashe, amincin rufin ya ɓace ba tare da la'akari da kaddarorin lantarki ba.
Takaitawa – Tsaya Tsakanin 260°C don Dogaran Insulation
Yanayin Zazzabi
Ayyukan Insulation
Jihar Injiniya
Shawara
-180°C zuwa 260°C
Excellent - barga, high resistivity, low hasara
Mai sassauƙa (kalli ga brittleness a ƙasa -79°C)
Amintacce don ci gaba da amfani
260°C – 327°C
Wulakanci - shafi mai laushi na iya lalacewa/ huda
Tausasawa
Ba abin dogaro ba - guje wa ɗaukar hoto mai dorewa
327°C – 400°C
Kusa da gazawa - narkewa, asarar tsari
Gel/ruwa
Ba don amfanin lantarki ba
>400°C
Rashin gazawa na dindindin - carbonization yana haifar da hanyoyin gudanarwa
Bazuwar
Bala'i - maye gurbin nan da nan
A taƙaice , a cikin ci gaba da yanayin zafin aiki da aka ba da shawarar (≤260°C), zafin jiki yana haifar da mummunan tasiri akan PTFE babban zafin jiki na rufin lantarki. Adadin juriya ya kasance sama da 10⊃1;⊃3; Ω · cm a 200 ° C; dielectric akai-akai yana tsayawa a 2.0-2.1; rarrabuwar kawuna a ƙasa 0.001. Wannan ya sa PTFE daya daga cikin mafi barga high-zazzabi insulating kayan samuwa - musamman muhimmanci ga high-mita aikace-aikace inda sauran polymers shan wahala mai yawa asara.
Da zarar zafi ya wuce 260 ° C, gazawar rufewa yana farawa daga laushi da nakasawa, daga ƙarshe ya zama cikakkiyar lalacewar lantarki. Sama da 400 ° C, carbonization yana haifar da hanyoyin gudanarwa na dindindin. A ƙasa 0 ° C, kayan lantarki suna haɓaka, amma ɓarna na inji yana haɗarin fashe murfin.
Kuna buƙatar babban zane mai zafin jiki na PTFE tare da garantin kayan rufewa don kewayon zafin ku? Aokai PTFE yana ba da cikakkun bayanan gwajin dielectric daga -70°C zuwa 260°C. Tuntuɓe mu tare da zafin aiki, ƙarfin lantarki, da buƙatun mitar ku.
Idan kuna buƙatar ƙarin ƙayyadaddun ƙayyadaddun bayanai, mafita aikace-aikacen, da samfuran samfuran samfuran da suka dace ciki har da PTFE high-zazzabi zane, PTFE m tef, PTFE raga conveyor bel, sumul fusing inji bel, guda-gefe mai rufi PTFE masana'anta da high-zazzabi resistant conveyor & fiberglass zane , da fatan za a tuntube mu:
