PTFE high-temperature fabric insulating gaskets combine high dielectric zog (ruaj khov nyob rau hauv cov av noo), -70 ° C mus rau 260 ° C kub ntau yam, universal tshuaj tsis kam (tshwj tsis yog molten alkali hlau), non-stick deg (tiv thaiv creepage), anti-creep (fiberglass reinforcement vs. ntshiab PTFE), siab tensile zog μ0. V-0 nplaim taws ntsuas. Piv nrog rau mica, roj hmab, thiab ntshiab PTFE gaskets, PTFE daim ntaub muaj superior saj zawg zog, processability, thiab ntev mus ntev stability. Zoo tagnrho rau transformers, lub cev muaj zog rwb thaiv tsev, tshuaj flange sealing, thiab semiconductor khoom.

PTFE daim ntaub flatness thaum sintering yuav tsum nruj nro, kub, thiab tswj tswj. Cov txheej txheem tseem ceeb: stenter tshuab (pin daim hlau tuav dav, tiv thaiv weft shrinkage), gradient kub profile (slow cua sov → 380-400 ° C tuav → qeeb txias hauv qab 310 ° C ua ntej tso nro), pre-shrunk substrate (tshem weaving kev nyuaj siab ua ntej txheej), thiab uniform txheej thickness (tiv thaiv sib txawv melting). Steter restraint yuav tsum tau khaws cia kom txog thaum txias hauv qab ntawm PTFE crystallization point (kwv yees li 310 ° C) los tiv thaiv warpage.

Txheej uniformity thaum lub sij hawm PTFE emulsion impregnation ntawm fiberglass ntaub yog lub lifeline ntawm cov khoom zoo. Cov txheej tsis sib xws ua rau: tsis muaj cov nplaum tsis ua haujlwm (sib lo rau ntawm qhov nyias nyias), kev ua haujlwm tsis muaj zog (kev ntxhov siab, kev tsim kua muag), hluav taws xob tsis ruaj khov (kev tawg hluav taws xob poob mus rau 1/10), tshuaj nkag mus (pinhole corrosion), qhov teeb meem loj (warpage), thiab kev ua haujlwm tsis xws luag (siv wandering, thickness variation). Cov txheej txheej yuav tsum tau tswj xyuas meej ntawm emulsion viscosity, cov ntsiab lus khoom, cov ntaub ntom ntom, nyem qhov khoob, thiab ntau thaj chaw ziab / sintering profiles.

PTFE high-temperature fabric undergoes plaub theem ntawm kev hloov pauv raws li qhov kub thiab txias: hauv qab 260 ° C - qeeb micro-cracking thiab residual additive volatilization; ntawm 327 ° C (melting point) - crystalline-rau-amorphous hloov, txheej softens, delaminates los ntawm fiberglass; 400-500 ° C - PTFE depolymerizes (tso tawm cov pa roj carbon monoxide), txheej txheej ploj; saum toj 500 ° C - fiberglass softens (840 ° C softening point) thiab poob kev ncaj ncees. Nyob qis dua 260 ° C tas mus li, tsis txhob> 300 ° C peaks rau kev ua haujlwm nyab xeeb.

PTFE high-temperature fabric deg kho mob lov tshuaj inertness rau kev sib txuas / luam ntawv. Plaub txoj kev: tshuaj etching (sodium-naphthalene, nto zog 20 → 40-50 dyn / cm, ruaj khov txheej tsaus, micro-porous qauv), plasma kev kho mob (nano-roughening, functional pab pawg grafting, luv luv lub qhov rais), corona kho (thin-zaj duab xis, ceev decay, txwv qhov tob), thiab laser patternization (pre-precision carbonization). Txhua txoj kev siv lub cev roughen thiab chemically qhia cov pawg polar (C = O, -OH, -COOH) kom ua kom cov nplaum nplaum.

Raw khoom purity yog lub hauv paus tseem ceeb ntawm PTFE high-temperature ntaub zoo. Cov impurities (cov pib residual, surfactants, hlau ions, contaminated sizing agents) ua rau ntxov ntxov thermal degradation (npua, blistering saum toj no 260 ° C), uneven non-stick nto (adhesion anchor ntsiab lus), txo hluav taws xob rwb thaiv tsev (dielectric poob, qis dua tawg voltage), tsis muaj zog mechanical zog (kev nyuaj siab concentration, / tawg). Cov ntaub ntawv purity siab kom ntseeg tau tias FDA ua raws, lub neej ntev, ua haujlwm siab PTFE daim ntaub.

PTFE-coated fiberglass npuag sintering yuav tsum tau tuav lub sijhawm ntawm 370-400 ° C. Nruam rauv: 30-90s (nyias) txog 3-5+ min (tuab). Batch furnaces: 5-15 feeb. Under-sintering ua rau opaque, ntxhib txheej uas tev; over-sintering ua rau yellowing, brittleness, thiab tshuaj fluoride gas tso tawm. Cov txheej txheem optimization: siv cov ntsuas kub ntawm lub cub tawg, ua qhov kev tshuaj xyuas qhov muag (semi-pob tshab, hloov tau), thiab ua cov ntawv rub tawm. Nco ntsoov xyuas kom tag nrho-thickness kub uniformity.

PTFE high-temperature npuag yuav tsum tau ceev faj tuav kom muaj kev nyab xeeb thiab siv tau ntev. Cov lus ceeb toom tseem ceeb: tsis txhob siab tshaj 260 ° C (siab dua 320 ° C tso pa tawm cov pa phem), tsis txhob muaj cov pa phem (ntxuav txheej, nthuav tawm fiberglass), tsis muaj kev ntxuav (steel wool puas tsis-stick nto), cia thermal expansion clearance (tiv thaiv tearing), thiab hloov thaum blistered los yog tev. Khaws dov, kom deb ntawm UV. Hnav cov hnab looj tes tiv thaiv tshav kub thaum tuav.

PTFE high-temperature npuag muaj ib coefficient ntawm thermal expansion (CTE) ntawm 30-60 ppm / ° C (warp / weft) - siab tshaj fiberglass ib leeg tab sis deb qis dua ntshiab PTFE (100-200 ppm / ° C). PTFE tau hloov pauv sai sai (1-2%) ntawm 19 ° C thiab 30 ° C theem hloov. Txhawm rau kom tsis txhob buckling, tearing, thiab delamination: tsim clearances dawb expansion, tsis txhob tensioning los ntawm theem hloov kub, siv tsis siv neeg tensioners ntawm conveyor siv, thiab siv anti-buckling overlap tsim. Kev tshuaj xyuas tsis tu ncua rau cov dej txias yog qhov tseem ceeb.

PTFE high-temperature fabric baking mats muaj plaub qhov txiaj ntsig tseem ceeb: kev ua haujlwm tsis zoo (tsis muaj roj lossis hmoov nplej, cov khoom noj qab zib tso tawm kom huv), qhov kub ntau (-70 ° C txog 260 ° C, muaj kev nyab xeeb rau qhov cub rau lub freezer), rov siv dua (txhiab ntau lub voj voog, yooj yim los ntxuav), thiab txawm tias kub kub (tiv thaiv kub hnyiab, sib npaug xim av). Khoom noj khoom haus-qib FDA raws, lawv outlast daim ntawv parchment thiab outperform silicone mats nrog zoo dua tshav kub hloov thiab finer nto zoo nkauj.