Ichi chinyorwa chinotarisa maitiro eiyo microporous chimiro dhizaini yeinofema Teflon (PTFE) yakakwirira-tembiricha tepi inoyera kupindirana kwemhepo nekudzivirira uye kusanamatira zvivakwa. Kupokana kwepakati: kupindira kwemhepo kunoda mapores akavhurika, nepo insulation ichida kuwanda uye isiri-tsvimbo inoda nzvimbo dzakatsetseka. Kuenzanisa magadzirirwo mazano: kudzora avhareji pore dhayamita (0.1-2μm, zvakanaka <0.5μm) kudzivirira kunyunguduka kupinda uye kuchengetedza kuparara voltage; kudzora porosity pa50-70% (≈60% yakakwana) kubudirira Gurley 20-100s / 100cc uye dielectric simba ≥2kV ye0.13mm firimu; tora yakakwirira-tortuosity 3D network pore chimiro (τ≈2.5-4) kudzvanyirira yakatwasuka-kuburikidza nekuburitsa nzira; kuvaka asymmetric gradient pore chimiro chine dense pamusoro peganda layer (1-5μm) kune isiri-tsvimbo / insulation uye ine porous mukati mekufema; shandisa super-oleophobic/hydrophobic surface post-treatment pasina pore blockage.

Ichi chinyorwa chinopa zvakanakira PTFE yakakwirira-tembiricha jira seyepamusoro-tembiricha sefa midhiya. Masimba matanhatu akakosha: Yakasarudzika tembiricha kuramba (inoenderera 260 ° C, peak ~ 300 ° C), inodarika PPS (190 ° C) uye aramid (200 ° C); Kunyanyisa kemikari inertness kurwisa acids, alkalis, solvents uye oxidants, hydrolysis-resistant, outperforming aramid uye P84 mune corrosive flue gasi; Superior guruva yekuchenesa kuita ine Ultra-yakaderera pamusoro pesimba inoita kuti nyore guruva kubviswa keke uye yakaramba yakaderera kudonha kudonha; Yakanakisa kusefa kunyatsoshanda nemapore saizi 0.1-3μm inobata pamusoro pe99.99% yePM2.5 zvidimbu; Kusina-kupisa neLOI pamusoro pe95%, ine anti-static sarudzo dziripo; Yakakwira mechanic simba kubva kufiberglass kusimbisa, ine yakachena PTFE fiber midhiya inopa kuchinjika uye > 4 gore rehupenyu hwebasa. Inofananidzwa zvakanaka nePPS, aramid, Nomex, P84 uye fiberglass sefa midhiya pane tembiricha, makemikari kuramba, hydrolysis kuramba uye kuchenesa kuita.

Ichi chinyorwa chinopa mhinduro dzakarongeka dzekudzivirira masara ekunamatira uye kubuda kweropa kana uchishandisa PTFE high-temperature tepi kuchengetedza PCB zvigunwe zvegoridhe panguva yeSMT musangano. Root chikonzero chekuongorora: zvakasara zvinoitika kubva pakukundikana kwakabatana kana kutamisa kwemukati; kubuda ropa kunoitika kubva pakudonha kweviscosity uye kunamira kunofashukira pasi pekupisa kwekuyerera. Mushonga wepakati wakakodzera tepi kusarudzwa: silicone PSA ine peak yenguva pfupi ≥300 ° C, inoenderera ≥260 ° C, yakazara ukobvu 0.08-0.13mm ine yakatetepa yakakwirira-yakabatana adhesive layers, uye anti-kubuda ropa / kusasara-isina chitupa. Nhanho-nhanho yekudzora maitiro: pre-lamination kuchenesa ne IPA; zero-tension lamination ine full air evacuation; optimized reflow tembiricha mbiri nekudziisa zvinyoro (<2°C/s); kutonhora kunoputika pasi pe50 ° C pa 180 ° angle; kukurumidza kugadzirisa mukati maawa makumi maviri nemana uye kamwe-kushandiswa chete; kutadza kubata ne IPA kupukuta uye 40-50x magnifier kuongorora. Kune maviri-mativi maPCB, tsiva nematepi nyowani pamberi pechipiri divi kugadzirisa.

Ichi chinyorwa chinopa nhungamiro yakarongeka pakudzivirira wrinkles paPTFE yakakwirira-tembiricha jira panguva sintering. Makwinya anonyanya kukonzerwa nekusaenzana kwekushisa shrinkage uye kusagadzikana kusagadzikana. Mhinduro dzinovhara kuzara kwebasa: raw material substrate control (yakazara dewaxing / kupisa kuisa kubvisa kushushikana kwemukati); impregnation uye kuomeswa (akawanda akaonda machira, zvinyoro tembiricha gradient, inoshanda drive rollers); sintering furnace control (1-3% overfeed for thermal shrinkage allowance, yakavharwa-loop micro-tension control, transverse tembiricha kufanana mukati me ± 5 ° C, gradient preheating-sintering-kutonhora curve, air-flotation furnaces seyakanyanya mhinduro, curved spreader rollers); kutonhora nekugadzirisa (zvishoma nezvishoma kutonhora kunononoka, chengetedza kupararira kusvika pasi pe100 ° C, kutonhora kwakazara kusati kwapera); Kutarisisa pamhepo nekutarisa kwakasimba kwechiedza uye infrared scanning.

Ichi chinyorwa chinoongorora kuti sandblasting kana matt kupedza kurapwa kunokanganisa sei chimiro chepamusoro chePTFE jira rinopisa. Shanduko dzinoitika mumativi matatu: Microscopic morphology inoshanduka kubva pagirazi rakatsetseka-kunge kune rough gully texture ine zvakanyanya kuwedzera Ra/Rz values, kugadzira 3D mechanical anchoring zvimiro zvechinotevera chisungo. Coating kutendeseka kunotarisana nenjodzi: PTFE layer kutetepa, kungangove kuratidzwa kwefiberglass substrate (zvichikonzera kurasikirwa kweiyo isiri-tsvimbo pfuma, hunyoro kupinda, uye kuderedzwa kwesimba remagetsi), pamwe ne microcracks uye marara kugadzirwa.

Ichi chinyorwa chinosuma iyo yakazara yakakosha maitiro ekumisikidza fiberglass jira nePTFE emulsion. Matanho manomwe akakosha: ① Pretreatment (dewaxing/desizing) pa350-400°C kubvisa machira ekuisa saizi; ② Emulsion formulation ine 40-55% yakasimba yemukati uye ma surfactants ekuvandudza weti; ③ Impregnation kuburikidza nedhip-kusvina nzira kana chiremba blade coating; ④ Kuomesa pa 100-150 ° C kuti zvinyoro zvinyorove mvura uye uite yakaoma PTFE firimu; ⑤ Sintering pa 360-390 ° C (kusvika 400 ° C) kunyungudutsa PTFE zvimedu kuita firimu rinoenderera; ⑥ Multi-cycle impregnation-drying-sintering inodzokororwa 2-4 nguva kusvika kune chinangwa chakakora uye resin content (45-65%); ⑦ Kurapwa mushure mekurapa kunosanganisira kurapwa kwekorona, kuchekerera kwemupendero, kumonereka uye kuongororwa kwemhando. Core control point: dewaxing yakazara, yakazara emulsion wetting, zvishoma nezvishoma kuomeswa, chaiyo sintering tembiricha, uye inowirirana coating density. Zvigadzirwa zvinoshandisa high-frequency copper-clad laminates, high-temperature conveyor mabhandi uye architectural membrane zvinhu.

Ichi chinyorwa chinovhara core performance indicators yePTFE high-temperature tepi inoshandiswa muvacuum coating, vacuum heat treatment uye nharaunda dzakafanana. Zvinodiwa zvakakosha zvinosiyana zvakanyanya nekushandiswa kwemuchadenga: kubuda kunze kunonyanya kukosha (TML≤1%, CVCM≤0.1%; aerospace / optical mamakisi anoda TML≤0.5%, CVCM≤0.01%); tembiricha kuramba kunofanira kusimbiswa kune ese ari maviri PTFE substrate (260 ° C) uye adhesive layer; yakanyatsocheneswa yakaderera-outgassing silicone PSA inodiwa kudzivirira siloxane kusvibiswa; high-temperature inobata simba inodzivirira kukambaira uye kusimudza kumucheto; utsanana hunoda kusabvisa fiber uye pasi ionic content; anti-static tepi (pamusoro resistivity 10⁶-10⁹ Ω/sq) inodzivirira ESD kukuvara; plasma kuramba kunofanirwa kuongororwa kune sputtering / PECVD maitiro; thermal shrinkage pazasi 2% inovimbisa masking chaiyo.

Ichi chinyorwa chinozivisa organic solvents iyo PTFE yakakwirira-tembiricha jira inogona kumira. PTFE-yakavharidzirwa fiberglass jira rinoratidza kusaenzana kwekemikari inertness, ichipikisa zvinenge zvese zvakajairika organic zvinonyungudutsa pasi pemamiriro ekushanda akajairwa pasina kuparara, kuzvimba kana kemikari kuita. Zvikamu zvinoshivirika zvinosanganisira: doro (methanol, ethanol, isopropanol), ketoni (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), hydrocarbons (peturu, toluene, xylene, hexane), halogenated hydrocarbons (dichloromethylene), carbon dioxide, tether. THF), organic acids (glacial acetic acid, formic acid), amines uye amides (triethylamine, DMF), phenols, uye zvimwe zvakaita secarbon disulfide, pyridine, silicone mafuta uye brake fluid.

Ichi chinyorwa chinobata kutonhora chiyero zvinodiwa panguva yePTFE yakakwirira-tembiricha jira sintering. Mushure mekupisa pa 380-400 ° C, jira rinofanira kukurumidza kupfuura nepakati pe 310-315 ° C crystallization-sensitive zone. Inokurudzirwa kutonhora chiyero ingangoita 30-50 ° C / min (jira rakatetepa rinogona kuwana 100-200 ° C / min kuburikidza nemhepo kutonhora). Kukurumidza kutonhora (kudzima) kunogadzira yakaderera crystallinity (45-50%), ichiburitsa yakapfava, yakaoma machira ane nzvimbo yakatsetseka, kunamatira kwakasimba, kuita kwakanakisa kusiri tsvimbo, uye kuramba delamination uye kuputika. Kunonoka kutonhora (kutonhora kwechoto) kunoguma nehupamhi hwekristaro (60-70%), zvichikonzera kuomarara, brittle coatings inowanzoita shrinkage, peeling uye microcracks.

Ichi chinyorwa chinofananidza kamuri-tembiricha uye yakakwirira-tembiricha maturation yesilicone pressure-sensitive adhesive yePTFE tepi. High-temperature maturation (120-180 ° C) inogadzira dense crosslinked network ine simba rakasimba rakabatana, kudzivirira zvakasara zvakanamatira mushure mekusvuura. Iyo inoumba makemikari anchoring zvisungo nePTFE substrates kuburikidza ne primer co-kurapa, kubvisa delamination njodzi. High-temperature maturation inobvisawo low-molecular volatiles isati yasununguka, kudzivirira kuputika uye kusvibiswa kwesilicone mafuta panguva yekutanga kupisa.