Kab lus no suav nrog cov ntawv thov ntawm Teflon high-temperature daim ntaub (PTFE-coated fiberglass npuag) hauv aerospace teb. Cov ntaub ntawv tseem ceeb: Kev tsim cov khoom siv sib xyaw - tso tawm daim ntaub / zaj duab xis hauv autoclave molding, txheej txheej cais, kub-kub conveyor siv rau prepreg ntau lawm; Lub cav thiab kev tiv thaiv kev kub siab - thermal rwb thaiv tsev pam, firewall cladding, hloov tau yooj yim-kub sib txuas; Hluav taws xob rwb thaiv tsev thiab hlau hlua tiv thaiv - cable wrapping nyob rau hauv engine compartments thiab tsaws iav bays; Lub dav hlau sab hauv thiab kev tiv thaiv hluav taws - cov ntaub thaiv hluav taws / cov pa taws teeb meem raws li FST cov qauv, thermal / acoustic rwb thaiv tsev pam cladding; Qhov chaw thiab aerospace daim ntaub ntawv - ntau txheej rwb thaiv tsev (MLI) cov rooj sib txoos, tiv thaiv khaub thuas-weld lubrication liners rau lub hnub ci vaj huam sib luag xa tawm mechanisms thiab kav hlau txais xov hinges, thermal tswj ntaub.

Kab lus no piav qhia yuav ua li cas PTFE txheej daim ntawv cog lus rau fiberglass ntaub substrate hauv Teflon high-temperature ntaub. Cov tshuaj sib txuas ncaj qha yog tsis yooj yim sua vim PTFE lub zog ultra-low nto zog. Bonding yog tiav los ntawm: Mechanical interlocking (lub cev sib txuas) - PTFE emulsion penetrates fiber ntau thiab grips fiber bundles tom qab sintering; Silane coupling tus neeg saib xyuas pretreatment - tsim choj molecular ntawm inorganic iav fibers thiab organic primer; Tshuaj primer hloov txheej txheej - siv PAI, PPS, PES los yog PEEK resins nrog PTFE micropowder, thov tom qab kev kho mob coupling los tsim robust kev hloov txheej; Kub-melt nplaum zaj duab xis lamination - FEP los yog PFA films (melting point 260-310 ° C) daim ntawv cog lus ua ntej tsim PTFE zaj duab xis rau ntaub; Gradient qauv ntawm ntau yam impregnation thiab sintering cycles - dilute thawj dhau nrog binder / coupling tus neeg saib xyuas nkag mus tob rau hauv fibers, ua raws li cov ntshiab PTFE impregnations, tsim compositional gradient los ntawm fiberglass mus rau ntshiab PTFE.

Kab lus no hais txog yuav ua li cas microporous qauv tsim ntawm breathable Teflon (PTFE) high-temperature daim kab xev sib npaug huab cua permeability nrog rwb thaiv tsev thiab tsis-stick zog. Cov teeb meem tseem ceeb: huab cua permeability yuav tsum tau qhib qhov pores, thaum lub rwb thaiv tsev xav tau ceev thiab tsis-stick yuav tsum tau du nto. Cov tswv yim tsim kev sib npaug: tswj qhov nruab nrab qhov pore txoj kab uas hla (0.1-2μm, qhov zoo tshaj <0.5μm) kom tiv thaiv yaj nkag mus thiab tswj qhov hluav taws xob tawg; tswj porosity ntawm 50-70% (≈60% pom) ua tiav Gurley 20-100s / 100cc thiab dielectric zog ≥2kV rau 0.13mm zaj duab xis; txais yuav high-tortuosity 3D network pore qauv (τ≈2.5-4) txhawm rau txhawm rau ncaj qha los ntawm kev tso tawm; tsim asymmetric gradient pore qauv nrog ntom ntom ntawm daim tawv nqaij txheej (1-5μm) rau tsis-stick / rwb thaiv tsev thiab ntxeem tau sab hauv rau breathability; siv super-oleophobic / hydrophobic nto tom qab kev kho mob yam tsis muaj pore blockage.

Kab lus no muab cov kev daws teeb meem rau kev tiv thaiv cov nplaum nplaum thiab cov nplaum nplaum thaum siv PTFE daim kab xev kub kub los tiv thaiv PCB cov ntiv tes kub thaum lub sij hawm SMT sib dhos. Hauv paus ua rau kev tsom xam: residue tshwm sim los ntawm kev sib koom ua ke tsis ua haujlwm lossis kev hloov pauv ntawm lub ntsej muag; los ntshav tshwm sim los ntawm viscosity poob thiab nplaum nplaum nyob rau hauv reflow tshav kub. Cov txheej txheem tseem ceeb yog xaiv cov kab xev kom zoo: silicone PSA nrog lub sijhawm luv luv ≥300 ° C, nruam ≥260 ° C, tag nrho cov tuab 0.08-0.13mm nrog nyias cov nplaum nplaum nplaum nplaum, thiab cov ntawv pov thawj los tiv thaiv los ntshav / residue-dawb. Kev tswj 6-kauj ruam: ua ntej lamination tu nrog IPA; xoom-tension lamination nrog kev khiav tawm ntawm huab cua; optimized reflow kub profile nrog maj mam cua sov (<2 ° C / s); txias peeling hauv qab 50 ° C ntawm 180 ° lub kaum sab xis; ua tam sim ntawd hauv 24 teev thiab siv ib zaug xwb; tsis ua hauj lwm tuav nrog IPA so thiab 40-50x magnifier tshuaj xyuas. Rau ob-sided PCBs, hloov nrog daim kab xev tshiab ua ntej ua haujlwm thib ob.

Kab lus no muab cov lus qhia txog kev tiv thaiv wrinkles ntawm PTFE high-temperature daim ntaub thaum sintering. Wrinkles yog tsim los ntawm qhov tsis sib xws ntawm thermal shrinkage thiab kev ntxhov siab tsis sib xws. Cov kev daws teeb meem suav nrog kev ua haujlwm puv ntoob: cov khoom siv raw khoom substrate tswj (ua tiav dewaxing / cua sov teeb tsa kom tshem tawm cov kev ntxhov siab sab hauv); impregnation thiab ziab (ntau txheej nyias, maj mam kub gradient, nquag tsav rollers); sintering furnace tswj (1-3% overfeed rau thermal shrinkage pub, kaw-voj micro-tension tswj, transverse kub uniformity nyob rau hauv ± 5 ° C, gradient preheating-sintering-txias nkhaus, cua-flotation furnaces raws li kev daws teeb meem, curved spreader rollers); cua txias thiab teeb tsa (muab maj mam txias, tswj kev sib kis kom txog thaum qis dua 100 ° C, tag nrho txias ua ntej winding); Kev tshuaj xyuas online nrog kev tshuaj xyuas lub teeb muaj zog thiab infrared scanning.

Kab lus no hais txog qhov yuav tsum tau ua kom txias thaum lub sij hawm PTFE high-temperature fabric sintering. Tom qab sintering ntawm 380-400 ° C, cov ntaub yuav tsum ceev nrooj dhau ntawm 310-315 ° C crystallization-sensitive cheeb tsam. Kev pom zoo kom txias yog tsawg kawg 30-50 ° C / min (cov ntaub nyias nyias tuaj yeem ua tiav 100-200 ° C / min ntawm cua txias). Kev txias sai sai (quenching) ua rau qis crystallinity (45-50%), yielding mos, tawv coatings nrog du nto, muaj zog adhesion, zoo heev uas tsis yog-stick kev ua tau zoo, thiab kuj rau delamination thiab cracking. Kev ua kom txias qeeb (lub qhov cub txias) ua rau muaj cov crystallinity siab (60-70%), ua rau cov tawv tawv tawv, tawv tawv tawv, ua rau shrinkage, tev thiab microcracks.

Kab lus no sib piv chav kub thiab kub-kub maturation ntawm silicone siab-rhiab nplaum nplaum rau PTFE daim kab xev. Kub-kub maturation (120-180 ° C) tsim dense crosslinked tes hauj lwm nrog muaj zog cohesive zog, tiv thaiv cov nplaum residue tom qab tev. Nws tsim cov tshuaj anchoring bonds nrog PTFE substrates ntawm primer co-curing, tshem tawm cov kev pheej hmoo delamination. High-temperature maturation kuj tshem tawm cov tsis tshua muaj molecular volatiles ua ntej xa, tiv thaiv bubbling thiab silicone roj paug thaum thawj cua sov.

Cov lus qhia no suav nrog PTFE qhov kub-kub daim kab xev xaiv rau kev txhaj tshuaj molding demolding thiab kev siv tshuaj tiv thaiv. Kev xaiv kub raws li: ≤260 ° C rau cov yas dav dav (tus qauv silicone PSA daim kab xev, 0.13-0.18mm); 260-300 ° C rau high-temperature engineering yas xws li PC, PA66, POM (high-temp silicone nplaum, 0.18-0.25mm); 300-400 ° C rau PEEK, LCP, PPS nyob ze cov neeg ua haujlwm kub (cov nplaum nplaum tsis ua haujlwm; siv cov ntaub nplaum tsis muaj PTFE lossis PFA zaj duab xis). Cov khoom siv raws li kev xaiv: tacky cov ntaub ntawv xav tau siab tso tawm ntshiab PTFE nto; iav / ntxhia ntim cov ntaub ntawv yuav tsum tau ua haujlwm hnyav 0.25mm + hnav-resistant daim kab xev; corrosive additives xav tau chemically resistant nplaum thiab ntom substrate; static-sensitive daim ntaub ntawv yuav tsum tau anti-static dub PTFE daim kab xev.

High-tensile PTFE high-temperature ntaub yog tsim los ntawm txheej PTFE mus rau high-strength fiberglass ntaub, muab tensile lub zog, tshav kub tsis kam, tsis-stick zog, tshuaj tiv thaiv, thiab tsis tshua muaj kev sib txhuam. Cov ntawv thov tseem ceeb muaj xws li: kev lag luam xa khoom (lub thawv ntim cua sov, ci zaub mov, tshuab ziab khaub ncaws, ntawv / zaj duab xis ziab); composite molding tso tawm ntaub thiab kub xovxwm cushion liners; vuam tiv thaiv kab hlau rhuav thiab thermal rwb thaiv tsev tsho; hluav taws xob lub cev muaj zog thiab transformer rwb thaiv tsev; tsim zawv zawg bearings thiab cov kav dej txhawb nqa; chemical filtration thiab valve sealing nyob rau hauv ib puag ncig corrosive. Lub zog tensile siab ua kom ruaj khov nyob rau hauv qhov nro, tearing, rov flexing, thiab kub-kub txhua yam kev ntxhov siab nyob rau hauv ntau hom kev siv hnyav hnyav.

Thaum lub sij hawm sintering, PTFE hais ntawm fiberglass ntaub yaj saum 327 ° C, rhuav tshem thawj folded-chain lamellae thiab particle ciam teb los tsim ib qho amorphous yaj. Thaum txias, PTFE recrystallizes rau hauv spherulites tsim ntawm radially oriented lamellae, nrog crystallinity li 50-70%. Txias tus nqi txiav txim siab siv lead ua zoo meej: qeeb txias yields ntau dua crystallinity, loj spherulites, hardness ntau dua; ceev quenching muab finer spherulites thiab txhim kho yooj.