Wannan labarin ya ƙunshi aikace-aikace na Teflon high-zazzabi zane (PTFE-rufi fiberglass masana'anta) a cikin sararin samaniya filin. Maɓallin aikace-aikacen yanki: masana'antar kayan haɗin gwiwa - sakin zane / fim a cikin gyare-gyaren autoclave, keɓewa yadudduka, bel mai ɗaukar zafi mai zafi don samar da prepreg; Injin da kariyar zafin jiki mai zafi - barguna masu rufewa na thermal, bangon bangon wuta, haɗin haɗin zafi mai sassauƙa; Rufin wutar lantarki da kariyar kayan aikin waya - nade na USB a cikin ɗakunan injin da wuraren saukar da kaya; Abubuwan ciki na jirgin sama da kariya ta wuta - labulen wuta / shingen hayaki da ke saduwa da ka'idodin FST, thermal / aoustic insulation bargo; Aikace-aikacen sararin samaniya da sararin samaniya - majalisu masu dumbin yawa (MLI), layukan lubrication na anti-sanyi-weld don hanyoyin jigilar hasken rana da hinges na eriya, zane mai sarrafa zafi.

Wannan labarin ya bayyana yadda PTFE shafi shaidu zuwa fiberglass masana'anta substrate a Teflon high-zazzabi zane. Haɗin sinadaran kai tsaye ba zai yiwu ba saboda PTFE's ultra-low surface energy. Ana samun haɗin kai ta hanyar: Haɗin kai na injiniya (haɗin kai na jiki) - PTFE emulsion yana shiga raƙuman fiber kuma yana riƙe da daure fiber bayan sintering; Silane hadawa wakili pretreatment - Forms kwayoyin gada tsakanin inorganic gilashin zaruruwa da Organic primer; Layer canji na kemikal - ta amfani da PAI, PPS, PES ko PEEK resins tare da micropowder PTFE, ana amfani da shi bayan haɗin haɗin gwiwa don ƙirƙirar madaurin canji mai ƙarfi; Hot-narke m fim lamination - FEP ko PFA fina-finan (narkewar batu 260-310 ° C) bond pre-kafa PTFE fina-finan zuwa masana'anta; Tsarin gradient ta hanyar haɓakawa da yawa da hawan hawan igiyar ruwa - tsarma izinin farko tare da wakili mai ɗaure / haɗawa yana shiga zurfi cikin zaruruwa, biye da ƙarancin PTFE mai tsabta, ƙirƙirar gradient daga fiberglass zuwa PTFE mai tsabta.

Wannan labarin yana magana ne akan yadda ƙirar ƙirar ƙirar ƙirar Teflon mai zafi (PTFE) mai zafi mai zafi yana daidaita yanayin iska tare da rufi da kaddarorin da ba na sanda ba. Rikici mai mahimmanci: iyawar iska yana buƙatar buɗaɗɗen pores, yayin da rufi yana buƙatar yawa kuma rashin sanda yana buƙatar filaye masu santsi. Madaidaitan dabarun ƙira: sarrafa matsakaicin diamita na pore (0.1-2μm, daidaitaccen <0.5μm) don hana narkewar shiga da kuma kula da ƙarancin wutar lantarki; sarrafa porosity a 50-70% (≈60% mafi kyau duka) cimma Gurley 20-100s / 100cc da ƙarfin dielectric ≥2kV don fim ɗin 0.13mm; Ɗauki tsarin pore na cibiyar sadarwar 3D mai girma-tortuosity (τ≈2.5-4) don murkushe tashoshi masu fitarwa kai tsaye; gina asymmetric gradient pore tsarin tare da m surface fata Layer (1-5μm) ga maras sanda / rufi da porous ciki don breathability; shafa super-oleophobic/hydrophobic saman bayan jiyya ba tare da toshewar pore ba.

Wannan labarin yana ba da mafita na tsari don hana ragowar mannewa da zubar da jini lokacin amfani da tef mai zafi mai zafi na PTFE don kare yatsun gwal na PCB yayin taron SMT. Tushen bincike na tushen: ragowar yana faruwa daga gazawar haɗin gwiwa ko canja wuri na fuska; zubar jini yana fitowa daga digon danko da mannewa ambaliya karkashin zafi mai sake kwarara. Maganin mahimmanci shine zaɓin tef ɗin da ya dace: silicone PSA tare da ɗan gajeren lokaci ganiya ≥300 ° C, ci gaba da ≥260 ° C, jimlar kauri 0.08-0.13mm tare da bakin ciki high-cohesion m yadudduka, da anti-jini / saura-free takardar shaida. Gudanar da matakai guda shida: tsaftacewa na farko tare da IPA; lamination na sifili tare da cikakken fitar da iska; ingantaccen bayanin yanayin sake kwarara tare da dumama mai laushi (<2°C/s); bawon sanyi a kasa 50 ° C a kusurwar 180 °; aiki nan da nan a cikin sa'o'i 24 da amfani guda ɗaya kawai; sarrafa gazawar tare da gogewar IPA da duban girman girman 40-50x. Don PCBs masu gefe biyu, maye gurbin da sabon tef kafin sarrafa gefe na biyu.

Wannan labarin yana ba da jagorar tsari akan hana wrinkles akan zane mai zafin jiki na PTFE yayin sintering. Wrinkles suna haifar da asali ta hanyar raguwar yanayin zafi mara daidaituwa da rashin daidaituwa. Magani suna rufe cikakken aikin aiki: sarrafa kayan albarkatun ƙasa (cikakken dewaxing / saitin zafi don kawar da damuwa na ciki); impregnation da bushewa (mafi yawa na bakin ciki coatings, m zafin jiki gradient, aiki drive rollers); sintering tanderu iko (1-3% overfeed don thermal shrinkage izni, rufaffiyar-madauki micro-tension iko, transverse zafin jiki uniformity tsakanin ± 5 ° C, gradient preheating-sintering-sanyi kwana, iska-flotation tanderu a matsayin mafi kyau duka bayani, lankwasa yada rollers); sanyaya da saitin (hannun hankali sannu a hankali, kula da yadawa har zuwa kasa 100 ° C, cikakken sanyaya kafin iska); saka idanu akan layi tare da duban haske mai ƙarfi da sikanin infrared.

Wannan labarin ya ƙunshi buƙatun sanyaya lokacin PTFE babban zafin jiki na zane sintering. Bayan dasa shuki a 380-400 ° C, masana'anta dole ne su wuce da sauri ta yankin 310-315 ° C crystallization-m. Adadin sanyaya da aka ba da shawarar shine aƙalla 30-50°C/min (tufafi na bakin ciki zai iya cimma 100-200°C/min ta hanyar sanyaya iska). Saurin sanyaya (quenching) yana haifar da ƙarancin crystallinity (45-50%), yana haifar da laushi, sutura masu tauri tare da santsi mai santsi, mannewa mai ƙarfi, kyakkyawan aiki mara ƙarfi, da juriya ga delamination da fatattaka. Jinkirin sanyaya (sanyiwar tanderu) yana haifar da babban crystallinity (60-70%), yana haifar da tsattsauran ra'ayi, gaɓoɓin rufin da ke da alaƙa da raguwa, kwasfa da microcracks.

Wannan labarin yana kwatanta yanayin ɗaki da zafin jiki mai girma na mannen matsi na silicone don tef ɗin PTFE. Babban zafin jiki balagagge (120-180 ° C) yana haifar da manyan hanyoyin sadarwa masu haɗin kai tare da ƙarfin haɗin kai mai ƙarfi, yana hana ragowar mannewa bayan kwasfa. Yana samar da haɗin haɗin sinadarai tare da PTFE substrates ta hanyar haɗin gwiwa na farko, yana kawar da haɗarin lalata. Babban zafin jiki balagagge kuma yana kawar da ƙananan ƙananan ƙwayoyin cuta kafin bayarwa, yana hana kumburi da gurɓataccen mai na silicone yayin dumama na farko.

Wannan jagorar ya ƙunshi zaɓin tef mai zafin zafin jiki na PTFE don gyare-gyaren allura da aikace-aikacen rigakafin sanda. Zaɓin tushen zafin jiki: ≤260 ° C don robobi na gabaɗaya (daidaitaccen tef ɗin PSA na silicone, 0.13-0.18mm); 260-300 ° C don robobi na injiniya na zafin jiki kamar PC, PA66, POM (manufin silicone mai zafi, 0.18-0.25mm); 300-400°C don PEEK, LCP, PPS kusa da masu gudu masu zafi (tef ɗin manne ya gaza; yi amfani da zane na PTFE mara ɗaure ko fim ɗin PFA). Zaɓin tushen kayan abu: kayan tacky suna buƙatar babban fitowar tsantsar PTFE; Gilashin / kayan da aka cika ma'adinai suna buƙatar nauyin nauyin 0.25mm + tef mai jurewa; abubuwan da ke lalata abubuwa suna buƙatar mannen sinadarai masu juriya da ƙaƙƙarfan maɗauri; aikace-aikace masu ƙarfi suna buƙatar tef ɗin PTFE baƙar fata na anti-a tsaye.

High-tensile PTFE high-zazzabi zane da aka sanya ta shafi PTFE uwa high-ƙarfi fiberglass masana'anta, miƙa tensile ƙarfi, zafi juriya, wadanda ba sanda Properties, sinadaran juriya, da kuma low gogayya. Mahimmin aikace-aikacen sun haɗa da: isar da masana'antu (marufi na rage zafi, yin burodin abinci, bushewar yadi, bushewar takarda / fim); hadaddiyar gyare-gyaren sakin zane da ginshiƙan matattarar zafi mai zafi; walƙiya labule masu kariya da jaket ɗin kariya na thermal; injin lantarki da rufin wuta; ginin zamiya bearings da bututun goyon bayan; tacewa sinadarai da kulle bawul a cikin mahalli masu lalata. Ƙarfin ƙarfi mai ƙarfi yana tabbatar da dorewa a ƙarƙashin tashin hankali, tsagewa, maimaita maimaitawa, da matsananciyar zafin injin a cikin waɗannan aikace-aikace masu nauyi daban-daban.

A lokacin sintering, PTFE barbashi a kan fiberglass masana'anta narke sama da 327 ° C, lalata asali folded sarkar lamellae da barbashi iyakoki don samar da wani amorphous narkewa. Bayan sanyaya, PTFE recrystallizes cikin spherulites kunshe da radially daidaitacce lamellae, tare da crystallinity jeri 50-70%. Kwancen kwantar da hankali yana ƙayyade ƙimar crystal: jinkirin sanyaya yana haifar da mafi girma crystallinity, mafi girma spherulites, mafi girma taurin; saurin quenching yana ba da mafi kyawun spherulites da ingantaccen sassauci.