Tsab ntawv xov xwm no suav nrog cov ntawv thov ntawm PTFE high-temperature npuag hauv carbon fiber ca composite khoom. Compression molding: muab tso rau ntawm pwm thiab prepregs tiv thaiv epoxy resin adhesion, ua kom yooj yim demolding; sandwiched ntawm ntau nyias panels kom tsis txhob muaj kev sib nrig sib adhesion. Nqus hnab molding: reusable tso tawm zaj duab xis ntawm prepreg thiab breather daim ntaub, tso pa roj / resin pass thaum ua kom yooj yim tev tom qab kho; textured sab hloov zoo nto zoo nkauj los txhim kho kev sib raug zoo roughness, tshem tawm sanding. Kev tsim khoom tas mus li: seamless non-stick conveyor siv nqa prepregs los ntawm cua sov / nias zones; cushion txheej faib lub siab tusyees txo qhov chaw indentations.

Kab lus no tshuaj xyuas qhov ua tau ntawm kev kho cov nplaim taws rau PTFE qhov chaw hloov kho thiab sib piv cov teebmeem nrog corona thiab kev kho ntshav ntshav. Kev ua tau zoo: nplaim hluav taws tuaj yeem hloov kho PTFE tab sis tsis tshua siv hauv kev lag luam - kev pheej hmoo kev nyab xeeb (PTFE decomposes tso tshuaj lom HF thiab perfluoroisobutylene); kev ua tau zoo txwv (nto lub zog tsuas yog 30-35 mN / m, cov ntaub ntawv tsis muaj zog ciam teb). Cov txheej txheem ua haujlwm: nplaim taws - qhov kub thiab txias oxidation (> 1000 ° C), me ntsis etching, ob peb pab pawg oxygen; corona - high-voltage paug generates ozone / nquag oxygen, oxidation me me, tsis tshua muaj zog ceev tsis tuaj yeem tawg CF daim ntawv cog lus; plasma - cov khoom siv hluav taws xob siab / hluav taws xob / cov dawb radicals ncaj qha cleave CF bonds thiab graft polar pawg (hydroxyl, carboxyl, amino).

Tsab ntawv xov xwm no hais txog yuav ua li cas kom phim txheej tshuab kab nrawm thiab qhov cub ntev kom ntseeg tau tias organosilicone nplaum ncav cuag lub hom phiaj kho kom sov rau PTFE daim kab xev. Lub hauv paus ntsiab lus tseem ceeb: tag nrho lub sijhawm nyob hauv t_total = qhov cub ntev L ÷ kab ceev v yuav tsum tsis pub tsawg tshaj li qhov yuav tsum tau kho lub sijhawm kho. Tau txais cov yam ntxwv kho mob los ntawm DSC lossis cov tshuaj nplaum kho mob uas tsim kom muaj 'kub - yam tsawg kawg nkaus kho lub sij hawm' kev sib raug zoo. Cov qauv sib npaug sib npaug: faib qhov cub rau hauv ib cheeb tsam, xam ti = Li / v thiab tcure(Ti), xyuas kom ∑(ti/tcure(Ti)) ≥1. Cov txheej txheem suav: teeb tsa qhov kub thiab txias nrog qhov ntev Li thiab kub Ti; teem kab ceev v, xam txhua cheeb tsam lub sij hawm nyob thiab qhov sib piv; iterate kom txog thaum tag nrho ≥1 (safety margin 1.1-1.2 pom zoo).

Kab lus no suav nrog kev ua haujlwm ntawm PTFE hauv thermal rwb thaiv tsev cladding rau missile xyaw. Plaub txheej txheem: Endothermic decomposition - PTFE depolymerizes ntawm ~ 400 ° C rau tetrafluoroethylene (siab endothermic, ~ 3,000 ° C combustion gas exposure), absorbing loj heev tshav kub thiab extracting thermal zog ntawm phab ntsa nto. Transpiration cooling thiab gas zaj duab xis rwb thaiv tsev - decomposition gases (tetrafluoroethylene) permeate sab nraud los ntawm micro-pores, tshem tawm cov cua sov; ntws roj zaj duab xis cais cov roj kub kub los ntawm phab ntsa, txo cov cua sov ze ntawm phab ntsa los ntawm> 50%; Gas zaj duab xis hloov kho thaj tsam txheej tshaj tawm / qhov kub thiab txias, alleviating particle erosion.

Kab lus no npog cov teebmeem ntawm gamma-ray irradiation ntawm PTFE qauv thiab cov khoom. Cov qauv tshuaj hloov pauv: gamma rays tawg CC lub ntsiab chains thiab CF sab chains (G-tus nqi 3.0-3.5), ua rau cov saw loj loj thiab hnyav molecular poob; Hauv cov pa oxygen, cov dawb radicals tsim peroxy radicals qhia acyl fluoride thiab carboxylic acid kawg pawg (hydrolyzing rau HF). Condensed qauv hloov: crystallinity nce pib (tsawg koob, luv chains rearrange) ces ntog (ntau dua, tsis xws luag cuam tshuam crystals); lamellar crystals tawg mus rau hauv me me crystallites nrog ploj mus ntev-ntev kev txiav txim. Khoom deterioration: elongation ntawm tawg poob ntawm 0.1 kGy nyob rau hauv huab cua, poob> 90% ntawm ~ 1kGy - cov khoom yuav nruj thiab nkig; melting point poob los ntawm 327 ° C mus rau hauv qab 310 ° C; polar pawg me ntsis tsa dielectric tas li / poob; nto hloov ntawm dawb mus rau grey / dub nrog gloss poob.

Kab lus no suav nrog txoj hauv kev los tswj cov crystallinity ntawm PTFE txheej ntawm Teflon high-temperature ntaub. Kev tswj hwm tus nqi cua txias yog qhov ncaj qha thiab ua haujlwm tau zoo: Kev ua kom txias sai (quenching) los ntawm cov ntaub thaiv cua txias, cov tub yees txias lossis cov dej tso tsheb hlau luam - cov saw hlau molecular khov ua ntej kev txiav txim, tsim cov pob zeb me me tsis zoo; txheej yog mos, tawv nrog optimized non-stick kev ua tau zoo, me ntsis txo hardness / hnav tsis kam. Kev ua kom txias qeeb (annealing) los ntawm kev txuag hluav taws xob ntawm 10-50 ° C / h los yog lub tshuab cua txias - molecular chains tag nrho npaj rau hauv loj ua tiav spherulites; txheej muaj siab hardness, zoo heev hnav tsis kam, ruaj khov qhov ntev, txo yooj thiab nce brittleness.

Kab lus no hais txog daim ntawv thov ntawm Teflon high-temperature daim ntaub nyob rau hauv kub-cua ncig sintering furnaces. Kev ua tau zoo: siv tau raws li tsis yog-stick cushion ntawm mesh siv los yog cov tais thaum lub qhov cub kub ≤260 ° C (kub kom qhuav, binder tshem tawm, slurry curing) - txhim kho demolding thiab khaws efficiency. Kev txwv nruj me ntsis ntawm qhov nruab nrab / siab kub (300-950 ° C) - PTFE decomposes tso cov tshuaj lom HF thiab perfluoroisobutylene, corroding cov cuab yeej thiab ua rau tuag taus. Lub hauv paus ntsiab lus ntawm kev nyab xeeb: yog lub qhov cub kub tsis meej lossis tsis tuaj yeem lav qis dua 260 ° C, tsis txhob siv. Cov khoom tseem ceeb: kev pabcuam txuas ntxiv -70 ° C txog 260 ° C, luv luv 300 ° C; heev tsis-stick thiab tshuaj inertness; zoo heev hluav taws xob rwb thaiv tsev; tsis tshua muaj kev sib txhuam (~ 0.04); fiberglass puag muab lub zog tensile siab.

Kab lus no sib piv qhov sib txawv ntawm cov hluav taws xob hluav taws xob hluav taws xob thiab cov cua kub cua kub kho cov txheej txheem ntawm crosslinked qauv uniformity ntawm silicone nplaum txheej. Thaum tshav kub kub hloov tshuab: kub-cua cia siab rau convection-conduction nrog maj mam kub nce, me me sab hauv / sab nraud kub sib txawv; IR tau txwv qhov tob tob nrog qhov nqus ntawm qhov chaw muaj zog (ntau txog kaum rau pua pua micrometers) tsim kom muaj qhov tob tob-rau-sab hauv gradient. Cov teebmeem ntawm crosslink uniformity: kub-cua ua rau synchronous curing sab hauv thiab tawm nrog uniform crosslink ntom; IR ua rau cov txheej txheem saum npoo kom nrawm nrawm 'skin film' uas cuam tshuam cov cua sov thiab cov saw hlau sab hauv, tsim kom muaj qhov sib txawv ntawm qhov sib txawv ntawm qhov chaw mus rau sab hauv.

Kab lus no suav nrog cov kab nrawm nrawm rau Teflon high-temperature fabric impregnation ntau lawm kab. Kev ceev ntau yam: cov khoom nyias nyias (0.08-0.30mm) ntawm 0.5-3 m / min, ruaj khov ntawm 1-3 m / min; tuab / ntau impregnated khoom (≥0.4mm) ntawm 0.3-1 m / min; high-efficiency kab nrog ntev qhov cub tuaj yeem ncav cuag 3-6 m / min tab sis xav tau cov khoom siv. Cov txheej txheem txwv: ziab thiab sintering yuav tsum tau nyob hauv lub sijhawm (PTFE xav tau 1-3 min ntawm 380-400 ° C; tsis txaus ua rau tsis zoo adhesion / cracking); ceev yog txiav txim los ntawm qhov tsawg kawg nkaus ziab / sintering lub sij hawm nyob rau hauv lub qhov cub tsau ntev. Cov khoom txwv: cov khoom siab siab / viscosity dispersions nkag mus qeeb; tuab / ntom ntaub nqus cov kua thiab hloov cua sov maj mam; wide fabrics nquag rau ntug-center xim sib txawv yuav tsum tau ceev txo. Cov cuab yeej siv thiab cov khoom lag luam zoo: ntev ntau thaj chaw qhov cub cia siab dua.

Kab lus no suav nrog qhov sib txawv ntawm PTFE emulsions tsim los ntawm kev ncua polymerization vs dispersion polymerization. Qhia meej: ncua kev kawm ntawv polymerization tsis tuaj yeem tsim PTFE emulsion ncaj qha; PTFE tiag emulsion tsuas yog los ntawm dispersion polymerization. 'Kev ncua-txoj kev emulsion' yog tiag tiag aqueous ncua kev kawm ntawv ntawm av suspension-polymerized resin micropowders. Dispersion polymerization (thawj emulsion): spherical hais (0.1-0.3μm, nqaim faib), stabilized los ntawm perfluorinated surfactants, siab molecular hnyav (> 94% crystallinity), muaj zog fibrillation, yuav tsum tau 380 ° C sintering rau daim ntawv nruam tawv zaj duab xis.