Iyi ngingo irerekana uburyo imiterere ya microporome igishushanyo cya Teflon ihumeka (PTFE) kaseti yubushyuhe bwo hejuru iringaniza imyuka ihumeka hamwe nubushakashatsi hamwe nibidafite inkoni. Amakimbirane yibanze: umwuka wogusaba bisaba imyenge ifunguye, mugihe insulasiyo isaba ubucucike naho kutaba inkoni bisaba ubuso bworoshye. Ingamba zishushanyije: kugenzura impuzandengo ya pore diameter (0.1-2μm, nibyiza <0.5μm) kugirango wirinde gushonga no gukomeza voltage yameneka; kugenzura ububobere kuri 50-70% (≈60% optimal) kugera kuri Gurley 20-100s / 100cc nimbaraga za dielectric ≥2kV kuri firime 0.13mm; fata imiyoboro ihanitse ya 3D imiyoboro ya pore (τ≈2.5-4) kugirango uhagarike imiyoboro inyuramo; kubaka imiterere ya asimmetric gradient pore ifite uruhu rwuzuye rwuruhu (1-5μm) kubutari inkoni / izirinda hamwe nimbere imbere kugirango ihumeke; koresha super-oleophobic / hydrophobic hejuru yubutaka nyuma yo kuvurwa nta guhagarika pore.

Iyi ngingo irerekana ibyiza byimyenda yubushyuhe bwa PTFE nkubushyuhe bwo hejuru bwo kuyungurura itangazamakuru. Imbaraga esheshatu zingenzi: Kurwanya ubushyuhe budasanzwe (gukomeza 260 ° C, impinga ~ 300 ° C), kurenga PPS (190 ° C) na aramide (200 ° C); Imiti ikabije ya chimique irwanya aside, alkalis, umusemburo na okiside, irwanya hydrolysis, irusha aramide na P84 muri gaze ya flue yangirika; Imikorere isukuye ivumbi hamwe nimbaraga zidasanzwe zubutaka zituma gukuramo ivumbi ryoroshye no kugabanuka k'umuvuduko muke; Uburyo bwiza bwo kuyungurura hamwe nubunini bwa pore 0.1-3μm ifata hejuru ya 99,99% ya PM2.5; Kudashya hamwe na LOI hejuru ya 95%, hamwe na anti-static ihari; Imbaraga zumukanishi zivuye muri fiberglass zishimangira, hamwe nibitangazamakuru byiza bya PTFE bitanga ibintu byoroshye kandi> ubuzima bwimyaka 4. Gereranya neza na PPS, aramid, Nomex, P84 hamwe na fiberglass filter itangazamakuru hejuru yubushyuhe, kurwanya imiti, kurwanya hydrolysis no gukora isuku.

Iyi ngingo itanga ibisubizo bya sisitemu yo gukumira ibisigazwa bifata hamwe no kuva amaraso yumuti mugihe ukoresheje kaseti ya PTFE yubushyuhe bwo hejuru kugirango urinde intoki za zahabu PCB mugihe cyo guterana kwa SMT. Isesengura ry'imizi: ibisigara bibaho biturutse ku kunanirwa gufatanya cyangwa kwimura intera; kuva amaraso bibaho biturutse ku kugabanuka kwijimye no gufatira hejuru yubushyuhe. Igisubizo cyibanze ni uguhitamo kaseti ikwiye: silicone PSA ifite impinga yigihe gito ≥300 ° C, ikomeza ≥260 ° C, uburebure bwuzuye 0.08-0.13mm hamwe nuduce twinshi twa cohesion yometseho, hamwe nicyemezo cyo kurwanya amaraso / ibisigisigi. Igenzura ryintambwe esheshatu: gusukura mbere ya lamination hamwe na IPA; zero-tension lamination hamwe no guhumeka ikirere cyuzuye; uburyo bwiza bwo kwerekana ubushyuhe hamwe n'ubushyuhe bworoheje (<2 ° C / s); gukonjesha gukonje munsi ya 50 ° C kuri 180 °; guhita gutunganya mumasaha 24 no gukoresha rimwe gusa; kunanirwa gukemura hamwe no guhanagura IPA no kugenzura 40-50x. Kubice bibiri PCBs, usimbuze kaseti nshya mbere yo gutunganya uruhande rwa kabiri.

Iyi ngingo itanga ubuyobozi bufatika bwo kwirinda inkari ku mwenda wo hejuru wa PTFE mugihe cyo gucumura. Iminkanyari iterwa ahanini no kugabanuka k'ubushyuhe hamwe no guhangayika bidahuye. Ibisubizo bikubiyemo ibikorwa byuzuye: kugenzura ibikoresho fatizo kugenzura (dewaxing / ubushyuhe bwuzuye kugirango ukureho imihangayiko y'imbere); gutera akabariro no gukama (impuzu nyinshi zoroshye, ubushyuhe bworoheje buringaniye, imashini ikora); kugenzura itanura (1-3% birenze urugero kumafaranga yo kugabanya ubushyuhe bwumuriro, gufunga-gufunga micro-tension kugenzura, guhuza ubushyuhe buringaniye muri ± 5 ° C, buhoro buhoro preheating-sintering-gukonjesha umurongo, itanura ryumuyaga nkibisubizo byiza, ibizunguruka bikwirakwiza); gukonjesha no gushiraho (buhoro buhoro gukonjesha, komeza gukwirakwira kugeza munsi ya 100 ° C, gukonjesha kwuzuye mbere yo kuzunguruka); gukurikirana kumurongo hamwe nubugenzuzi bukomeye bwumucyo hamwe na scan ya infragre.

Iyi ngingo isesengura uburyo kuvura umucanga cyangwa kurangiza kurangiza bigira ingaruka kumiterere yimyenda ya PTFE yubushyuhe bwo hejuru. Impinduka zibaho mubice bitatu: Microscopique morphologie ihinduka kuva mumirorerwamo yoroshye isa nkimiterere ya gully yuzuye hamwe nagaciro ka Ra / Rz byiyongereye cyane, bigashiraho uburyo bwa 3D bwububiko bwa tekinike kugirango buhuze nyuma. Ubusugire bwa coating burahura ningaruka: PTFE igabanuka, ishobora guhura na fiberglass substrate (itera igihombo cyumutungo udafite inkoni, kwinjira mubushuhe, no kugabanya imbaraga za mashini), wongeyeho microcrack hamwe no kubyara imyanda.

Iyi ngingo itangiza inzira yuzuye yo gutera inda ya fiberglass hamwe na emulion ya PTFE. Intambwe ndwi zingenzi: ret Kwitegura (dewaxing / desizing) kuri 350-400 ° C kugirango ukureho imyenda ingana; Formul Amuliyoni hamwe na 40-55% yibirimo bikomeye hamwe na surfactants zo kunoza neza; Gutera inda hakoreshejwe uburyo bwo kwibiza cyangwa gutwikira umuganga; Kuma kuri 100-150 ° C kugirango umwuka uhumeke neza hanyuma ukore firime yumye ya PTFE; Gutera kuri 360-390 ° C (kugeza kuri 400 ° C) gushonga ibice bya PTFE muri firime ikomeza; I Inzinguzingo nyinshi-inregnation-yumye-gucumura inshuro 2-4 kugirango ugere kubyimbye bigenewe hamwe na resin (45-65%); ⑦ Nyuma yubuvuzi burimo kuvura corona, gutema impande, guhinduranya no kugenzura ubuziranenge. Ingingo zingenzi zo kugenzura: gutembera byuzuye, guhanagura kwa emulsiyo yuzuye, gukama buhoro buhoro, ubushyuhe bwuzuye bwo gucumura, hamwe nuburinganire bwuzuye. Ibicuruzwa bitanga umurongo mwinshi wumuringa wambaye laminates, imikandara yubushyuhe bwo hejuru hamwe nibikoresho byububiko.

Iyi ngingo ikubiyemo ibipimo ngenderwaho byerekana imikorere ya PTFE yubushyuhe bwo hejuru ikoreshwa mu gutwikira vacuum, kuvura ubushyuhe bwa vacuum hamwe n’ibidukikije bisa. Ibisabwa byingenzi biratandukanye cyane nikoreshwa ryikirere: gusohora ni ngombwa cyane (TML≤1%, CVCM≤0.1%; amanota yo mu kirere / optique bisaba TML≤0.5%, CVCM≤0.01%); ubushyuhe bwo kurwanya ubushyuhe bugomba kugenzurwa kuri substrate ya PTFE (260 ° C) hamwe nigiti gifatika; byumwihariko wasukuwe cyane silicone ya silicone PSA irasabwa gukumira siloxane; ubushyuhe bwo hejuru bufata imbaraga birinda kunyerera no guterura inkombe; isuku isaba nta fibre yamenetse hamwe nibirimo ionic; kaseti irwanya static (irwanya ubuso 10⁶-10⁹ Ω / sq) irinda kwangirika kwa ESD; plasma irwanya igomba gusuzumwa kubikorwa / PECVD; kugabanuka k'ubushyuhe munsi ya 2% byemeza ko masking itomoye.

Iyi ngingo irerekana ibishishwa kama PTFE imyenda yubushyuhe bwo hejuru ishobora kwihanganira. Imyenda ya PTFE isize fiberglass yerekana ubudahangarwa budasanzwe bwa chimique, irwanya hafi yumuti rusange usanzwe mugihe cyakazi gisanzwe nta gusenyuka, kubyimba cyangwa imiti. Ibyiciro byihanganirwa birimo: alcool (methanol, Ethanol, isopropanol), ketone (acetone, MEK, cyclohexanone), esters (Ethyl acetate, butyl acetate), hydrocarbone (lisansi, toluene, xylene, hexane), hydrocarbone ya diyorogoro, dichloromethylne; ether, THF), acide organic (acide glacial acetic acide, acide formique), amine na amide (triethylamine, DMF), fenol, nibindi nka karubone disulfide, pyridine, amavuta ya silicone na feri ya feri.

Iyi ngingo ikubiyemo igipimo cyo gukonjesha mugihe cya PTFE yubushyuhe bwo hejuru. Nyuma yo gucumura kuri 380-400 ° C, umwenda ugomba guhita unyura muri 310-315 ° C ya kristu. Igipimo cyo gukonjesha gisabwa nibura 30-50 ° C / min (umwenda muto urashobora kugera kuri 100-200 ° C / min ukoresheje gukonjesha ikirere). Gukonjesha byihuse (kuzimya) bitanga ububobere buke (45-50%), butanga impuzu zoroshye, zikomeye hamwe nubuso bworoshye, gufatana gukomeye, gukora neza kutari inkoni, no kurwanya gusiba no guturika. Gukonjesha gahoro (gukonjesha itanura) bivamo kristu nyinshi (60-70%), bigatera impuzu zikomeye, zoroshye zoroshye kugabanuka, gukuramo na microcrack.

Iyi ngingo igereranya icyumba-ubushyuhe nubushyuhe bwo hejuru bwo gukura kwa silicone yumuvuduko ukabije wa kaseti ya PTFE. Gukura k'ubushyuhe bwo hejuru (120-180 ° C) bituma habaho imiyoboro ihuza imiyoboro ifite imbaraga zifatika, ikarinda ibisigazwa bifata nyuma yo kuyikuramo. Ikora imiti ihuza imiti hamwe na PTFE ikoresheje primer co-curing, ikuraho ingaruka zo gusiba. Gukura k'ubushyuhe bwo hejuru kandi bikuraho imbaraga za molekile nkeya mbere yo kubyara, bikarinda amavuta menshi ya silicone mugihe cyo gushyushya bwa mbere.