Tsab ntawv xov xwm no suav nrog cov peev txheej hauv kev thov rau Teflon high-temperature npuag hauv kev lag luam roj teeb uas muaj zog. Plaub qhov chaw: Qhuav electrode / electrolyte membrane manufacturing - high-temperature anti-stick conveyor siv rau kub yob nias (150-250 ° C) ua kom du tev ntawm tus kheej-txhawb zaj duab xis; kub cov menyuam npog txheej li semi-permanent anti-stick txheej; xyuas kom du zaj duab xis nto, txo qhov tsis xws luag, txhim kho yield. Tso cov ntaub ntawv thiab cushioning pads rau kub nias densification - sulfide/polymer roj teeb yuav tsum kub isostatic/pas nias (100-300 ° C, kaum MPa); PTFE npuag muab tso rau nruab nrab ntawm cov roj teeb thiab pwm tiv thaiv adhesion, ua kom tsis sib xws ntawm kev faib tawm ntawm micro-elasticity, tiv thaiv cov cua sov.

Kab lus no tshuaj xyuas cov kev hloov pauv rau PTFE molecular chains nyob rau hauv ultraviolet irradiation. Cov saw hlau tseem ceeb thiab txo qhov hnyav molecular: UV (254nm, 471 kJ / mol) rhuav tshem CC daim ntawv cog lus (347 kJ / mol), ua rau homolysis, tsim CF₂-tawm dawb radicals, ntse molecular hnyav poob, poob ntawm toughness thiab elongation. Cov kab mob dawb radical tshwm sim: hauv cov pa oxygen, peroxy radicals daim ntawv, rearranging rau acyl fluoride (-COF) thiab carboxylic acid (-COOH) pawg kawg, tso COF₂ thiab CO₂ (COF₂ hydrolyzes rau HF); nyob rau hauv inert atmospheres, disproportionation/recombination dominate, tab sis saw scission tseem predominant.

Qhov tsab xov xwm no npog daim ntawv thov ntawm Teflon high-temperature ntaub nyob rau hauv spacesuit thermal rwb thaiv tsev txheej. Cov khoom tseem ceeb: PTFE-coated fiberglass npuag, paub nyob rau hauv aerospace li Beta daim ntaub, combining ntaub yooj nrog PTFE huab-ib puag ncig inertness. Lub luag hauj lwm: txheej txheej ntawm Thermal Micrometeoroid Garment (TMG) nyob rau hauv extravehicular mobility units, ncaj qha ntsib lub nqus tsev vacuum, huab cua kub txawv, thiab micrometeoroids ua thawj lub cev / thermal barrier rau inner aluminized films. Kev tiv thaiv ib puag ncig hnyav: tiv taus -200 ° C txog + 260 ° C ntau yam (hnub-faus> 120 ° C rau duab ntxoov ntxoo -160 ° C); dawb nto qhia txog hnub ci hluav taws xob; tiv thaiv tsis taus aluminized polyimide films los ntawm khawb thiab kua muag. Kev pab txhawb nqa: tsis tshua muaj kev sib txhuam PTFE nto tiv thaiv txheej tangling thaum sib koom ua ke, kom ntseeg tau EVA yooj.

Kab lus no suav nrog daim ntawv thov zoo ntawm Teflon high-temperature npuag hauv lithium roj teeb electrode ziab. Siv los ua cov siv conveyor lossis qhov cub liner, daws peb qhov teeb meem tseem ceeb: slurry adhesion, corrosion, thiab electrode khawb. Plaub qhov kom zoo dua: Electrode zoo thiab tawm los - los tiv thaiv cov khoom tiv thaiv PVDF binder adhesion ua kom yooj yim ua kom tiav; uniform thermal conductivity ntawm 100-140 ° C tiv thaiv tawg / scorching; du nto tshem tawm khawb thiab hmoov shedding; Durability thiab kev ua haujlwm ruaj khov - tshuaj tiv thaiv tiv thaiv NMP hnyav thiab electrolyte vapors yam tsis muaj o / laus; siab tensile lub zog thiab qhov ntev stability ntawm fiberglass substrate rau meej qhov chaw; yooj yim tu nrog tsawg residue piv rau hlau mesh siv.

Kab lus no suav nrog cov kab nrawm nrawm rau PTFE high-temperature fabric impregnation ntau lawm kab. Ceev ceev: 2-15 m / min, ruaj khov kev khiav hauj lwm ntau 3-8 m / min, nyias fabrics / high-ceev kab mus txog 10-15 m / min. Kev txwv los ntawm impregnation nkag mus: ntaub yuav tsum tau saturated nrog PTFE emulsion rau hauv fiber ntau nras interiors - siab ceev heev ua rau impregnation tsis txaus, resin starvation thiab qhuav fibers; emulsion viscosity, solids concentration, fabric weave density tag nrho txo ​​qhov nkag mus, yuav tsum tau qeeb qeeb rau cov ntaub tuab / ntom. Txheej txheej: ntau dhau (2-6+) yuav tsum tau ua kom tuab tsis xws luag-dawb txheej; thawj dhau qeeb qeeb rau kev thauj mus los, cov ntawv hla tom ntej tuaj yeem nce nruab nrab.

Kab lus no suav nrog cov ntsiab lus silica thiab daim ntawv thov scenarios ntawm high-silica iav fiber ntau ntaub. Silica ntsiab lus specification: core indicator is SiO₂ ≥96% (tus qauv 96-98%, premium qib> 99% ntawm acid leaching thiab sintering, mus txog ntshiab quartz fiber). Kev tsim khoom: E-iav ntaub tau dhau los ua cov kua qaub kub kom yaj cov khoom tsis muaj silica (boron oxide, sodium oxide), tsim cov pob txha silica porous, ces sintered rau densification. Cov txiaj ntsig tseem ceeb: kev pabcuam txuas ntxiv ntawm 900 ° C hauv oxidizing atmospheres, lub sijhawm luv tshaj 1200 ° C, softening point ze 1700 ° C; tshuaj stability tiv thaiv feem ntau cov kua qaub/alkalis tshwj tsis yog HF thiab kub phosphoric acid; tsawg dielectric tsis tu ncua thiab ruaj khov rwb thaiv tsev ntawm qhov kub thiab txias.

Kab lus no hais txog qhov tshwm sim delamination ntawm Teflon high-temperature ntaub. Delamination hais txog kev sib cais thiab tev tawm ntawm PTFE txheej txheej thiab sab hauv fiberglass puag ntaub los yog ntawm ntau txheej txheej. Kev pom kev pom: blistering / bulging (nce npuas nrog hollow xav) raws li cov cim thaum ntxov; interlayer tev nrog txheej yooj yim tshem tawm hauv cov nplooj ntawv nthuav tawm cov fiberglass dawb; localized whitening ua raws li flaking tom qab tshav kub / kev sib txhuam. Cov laj thawj tseem ceeb: Kev kub ntxhov siab - sib txawv thermal expansion coefficients ntawm PTFE thiab fiberglass tsim kev ntxhov siab sab hauv, cua kub ceev / cua txias ua rau detachment; Kev tsim khoom tsis zoo - kev kho fiberglass tsis txaus, tsis zoo PTFE impregnation, tsis txaus sintering ua rau tsis muaj zog interfacial bonding.

Kab lus no piav qhia txog cov yam ntxwv ntawm microstructural ntawm Teflon high-temperature ntaub. Substrate skeleton: iav fiber ntau weaving kev ntxhib los mos nyob rau hauv dawb / twill weaves nrog siab porosity (micron-scale pores nyob rau hauv fiber bundles thiab ntawm warp-weft nodes) muab qhov chaw rau PTFE impregnation. Txheej morphology: tag nrho impregnation encapsulation txoj kev 'reinforced qhob' qauv qhov twg iav fibers yog reinforcing theem, PTFE yog nruam matrix; nto nodular microstructure ntawm nodules (particles) interconnected los ntawm nplua fibrils tsim thaum sintering; nruam daim tawv nqaij txheej (ob peb mus rau kaum ntawm microns tuab) ntawm ntshiab PTFE raws li qhov tseem ceeb barrier rau tshuaj inertness, tsis-stick zog, thiab hluav taws xob rwb thaiv tsev.

Kab lus no tshuaj xyuas cov kev hloov pauv hauv PTFE cov ntaub ntawv kub kub thaum laus. Plaub yam: PTFE txheej microstructure - molecular saw scission thiab oxidation (carbonyl / carboxyl pawg tsim), crystallinity hloov (thaum sawv ntxov ces cev qhuav dej), micro-crack thiab pinhole tsim, nto hmoov; iav fiber ntau substrate thiab interface - sizing / coupling tus neeg sawv cev decomposition ua rau poob ntawm kev sib txuas, interfacial debonding thiab delamination (blistering, dawb cheeb tsam), iav fiber network yaig thiab embrittlement, alkali hlau oxide nag lossis daus ua rau muaj kev ntxhov siab corrosion; Cov qauv macroscopic thiab tsos - xim hloov (dawb → beige → xim av → dub), shrinkage deformation thiab curling, nto roughening thiab gloss poob, hmoov thaum kov, ua tiav tsis yooj yim. Qhov tseem ceeb ntawm kev laus: kev nce qib ntawm 'coating degradation → interface tsis ua hauj lwm → substrate degradation.'

Kab lus no hais txog yuav ua li cas tswj sintering lub sij hawm ntawm PTFE high-temperature ntaub. Core tswj txoj kev: kab ceev hloov. Sintering lub sij hawm = cov cua sov seem ntev ÷ ntaub mus ceev. Qhov zoo ntawm sintering pib yog 350 ° C (siab tshaj qhov ntsuas kub no suav nrog lub sijhawm sintering). Multi-zone kub faib: preheating (100-250 ° C), sintering (360-395 ° C), siab kub (380-390 ° C), txias (qis dua 300 ° C). Siv sij hawm ntawm 380-390 ° C: hnav (0.08-0.13mm) 30-60 vib nas this; txheem (0.18-0.25mm) 1.5-3 feeb; hnyav (≥0.35mm) 3-5 feeb. Kev txheeb xyuas thiab kev hloov kho: hauv qab-sintering (tsis tshua muaj zog, hmoov tsis zoo, micro-cracks) → txo qis kom ncua sij hawm; over-sintering (daj, brittleness, dawb fumes) → nce ceev kom shorten nyob. Kub-lub sij hawm sib npaug tso cai rau high-temperature sintering (395-405 ° C, vib nas this) los yog qis-temp qeeb sintering (360-375 ° C, 5-8 feeb).