Qhov kawg ntawm lub ntsej muag qauv ntawm PTFE high-temperature daim kab xev ncaj qha cuam tshuam cov nplaum oozing thiab ntug lifting thaum lub sij hawm thov. Cov slitting tsis zoo (nplua nuj, lub kaum sab xis tsis zoo) tsim cov nplaum nplaum, thins lub ntug nplaum txheej, thiab nthuav tawm cov fiberglass burrs - ua rau oozing, tsis muaj zog, thiab nqa hauv qab cua sov lossis nro. Lub ntsej muag tsis sib xws (wavy, protruding) ua rau tsis sib xws ntawm kev faib tawm, tsav cov nplaum nplaum thaum khaws cia. Lub ntsej muag zoo tshaj plaws yog du, yaug, thiab tsis muaj kev puas tsuaj - ua raws li lub foob uas kaw cov nplaum thiab ua kom muaj kev sib txuas tag nrho.

Thaum lub sij hawm PTFE daim kab xev txheej, qhov hnyav volatilization tus nqi ntawm silicone siab-rhiab nplaum nplaum yog ib qho tseem ceeb ntawm cov txheej txheem parameter. Ceev dhau → deg skinning, tsis zoo leveling, pinholes (raug hnyav hnyav), thiab craters (condensation los yog contaminant-induced). qeeb dhau → sagging, tuab npoo, thiab dewetting ntawm qis-nto-zog PTFE. Qhov zoo tshaj plaws lub tswv yim: qeeb pib volatilization rau theem thiab npuas khiav, ces ceev kom qhuav rau shaping. Siv cov kuab tshuaj sib xyaw (toluene / xylene + ceev-drying) thiab gradient qhov cub kub (qis → nruab nrab → siab).

PTFE high-temperature daim kab xev muaj cov tshuaj ntsev zoo heev, tab sis cov ntsiab lus tsis muaj zog yog cov nplaum txheej thiab cov fiberglass substrate npoo. Kev soj ntsuam txoj kev: 1000h nruab nrab ntsev tshuaj tsuag (NSS), ntsuas tev lub zog tuav (≥80% xav tau), pom qhov tsis xws luag (lifting, blistering), thiab hlau substrate corrosion. Rau cov chaw hauv dej hiav txwv thiab cov ntsev-npaum huab cua: siv silicone PSA (tsis yog acrylic), tag nrho impregnated PTFE substrate, foob npoo nrog huab cua-resistant sealant, thiab siv primer rau cov hlau nto.

PTFE high-temperature daim kab xev poob adhesion tom qab rov siv dua vim qhov chaw paug (plua plav, silicone roj), nplaum cohesive tsis ua hauj lwm (residue), los yog tsis muaj zog substrate bonding. Cov kev daws teeb meem: high-crosslink silicone PSA (tsis tshua muaj kev tsiv teb tsaws, sib npaug tack / tuav lub zog), primer kev kho mob ntawm PTFE substrate, ntom fiberglass backing, thiab tuav kom zoo (huv qhov chaw, txias tev, 180 ° lub kaum sab xis). Quantitative test validates kev txhim kho.

PTFE high-temperature daim kab xev khaws cia nyob rau hauv tej yam kev mob (10-25 ° C, 40-70% RH, deb ntawm UV / hnyav siab) muaj ib tug txheej txheem txee lub neej ntawm 3-6 lub hlis (khoom kim heev qib mus txog 12 lub hlis). Qhov tseem ceeb degradation pib: tev lub zog yuav tsum tsis txhob poob qis dua 70% ntawm tus nqi pib; tsis muaj nplaum residue tom qab tshem tawm qhov kub thiab txias; tsis muaj carbonization los yog tawg ntawm qhov ntsuas kub. Kev kuaj xyuas sai: phau ntawv qhia kev xav tsis zoo, 260 ° C qhov kev sim residue, thiab kev sim lamination shrinkage.

Rolled PTFE daim kab xev tuaj yeem tsim interlayer adhesion (blocking) thiab nplaum hloov mus rau lub sijhawm ntev cia. Ua rau: PTFE zaj duab xis elastic nco thiab silicone PSA nkag rau hauv siab / cua sov. Kev tiv thaiv: gradient winding nro (sab nruj, sab hauv xoob) thaum lub sij hawm tsim khoom, ntxiv rau kev tso tawm txheej rau sab tsis-nplaum. Khaws ntawm -15 ° C mus rau 40 ° C, 30-70% RH, kab rov tav ntawm racks, tig rolls peb lub hlis twg. Rau cov qib nplaum tuab, ntxiv cov ntawv tso tawm ntawm cov khaubncaws sab nraud povtseg.

PTFE high-temperature tapes khaws cia rau hauv daim ntawv yob tuaj yeem raug kev txom nyem los ntawm interlayer adhesion (blocking) thiab nplaum hloov mus rau sab tsis-stick. Hauv paus ua rau: PTFE zaj duab xis elastic nco thiab silicone PSA nkag mus rau hauv siab thiab kub. Kev daws: gradient winding nro - nruj ntawm txheej txheej, xoob ntawm sab hauv txheej - siv kaw-voj nro tswj. Ntxiv nrog rau kev tso tawm txheej, cia kom zoo (15-40 ° C, 30-70% RH), kab rov tav tso, thiab peb lub hlis twg yob tig.

PTFE high-temperature daim kab xev siv nyob rau hauv kev sib cuag nrog zaub mov yuav tsum hwm nruj nruj txwv kub: ≤260 ° C rau kev siv tas mus li (tsis muaj sij hawm txwv), 260-300 ° C mus txog 30 feeb xwb, thiab > 300 ° C txwv. Daim kab xev yog rau kev sib cuag ncaj qha nkaus xwb (cov tais ntim khoom, lub hau npog npog), tsis yog qhwv cov zaub mov ncaj qha. Tsis txhob ua haujlwm yam tsis muaj khoom noj khoom haus (qhuav cua sov). Hloov yog blistered, yellowed, los yog hnav.

Silicone siab-sensitive adhesives (PSA) rau PTFE high-temperature tapes sib txawv nyob rau hauv high-temperature aging kev ua tau zoo. Methylphenyl silicone PSA khaws> 85% tev lub zog tom qab 250 ° C / 7 hnub, thaum tus qauv methyl poob rau 50-70%. Ntxiv-kho (hydrosilylation) cov tshuab muaj kev ruaj ntseg zoo dua li peroxide-kho. Txhawm rau txuas ntxiv 200 ° C + kev pabcuam, xaiv cov qib siab-phenyl-kho ntxiv.

Thermally conductive PTFE Pressure-sensitive Adhesive (PSA) tapes yuav tsum ua kom sov thaum nyob nplaum. Ntxiv cov fillers txhim kho thermal conductivity tab sis mob adhesion. Qhov zoo tshaj plaws sib npaug siv spherical coarse hais (raws li cov pob txha conductive) sib xyaw nrog cov khoom zoo (kom sau cov voids), ua kom tag nrho cov muab tub lim loading saum toj kawg nkaus qhov pib percolation. Tsis txhob flakes thiab fibers; lawv tua tack.