Iyi ngingo ikubiyemo uburyo bwo guhuza umuvuduko wumurongo wumurongo hamwe nuburebure bwa furu kugirango hamenyekane ko imiti ya organosilicone igera kurwego rwo gukiza kurwego rwo hejuru rwa PTFE. Ihame ryibanze rihuye: igihe cyose cyo gutura t_total = uburebure bwa furu burebure L ÷ umurongo umuvuduko v ugomba kuba munsi yigihe gito gisabwa cyo gukira. Shakisha imiti ikiza ukoresheje DSC cyangwa ibizamini byo gukiza byerekana 'ubushyuhe - igihe gito cyo gukiza ' umubano. Icyitegererezo cyo gukiza kimwe: kugabanya ifuru muri zone, kubara ti = Li / v na tcure (Ti), menya ∑ (ti / tcure (Ti)) ≥1. Uburyo bwo kubara: shiraho ubushyuhe bwuburebure bwa Li n'ubushyuhe Ti; shiraho umurongo wihuta v, ubare buri zone igihe cyo gutura nigipimo cyintererano; gusubiramo kugeza byose hamwe ≥1 (margin umutekano 1.1-1.2 bisabwa).

Iyi ngingo ikubiyemo uburyo bwo kugenzura ububobere bwa PTFE ku mwenda wo hejuru wa Teflon. Igipimo cyo gukonjesha kirasobanutse neza kandi cyiza: Gukonjesha byihuse (kuzimya) ukoresheje umwenda ukonje, imizingo ikonjesha cyangwa ibigega byamazi - iminyururu ya molekile irahagarara mbere yo gutegekwa, ikora kristu ntoya idatunganye; gutwikira biroroshye, birakomeye hamwe nuburyo bwiza bwo gukora butari inkoni, kugabanuka gukomeye / kwihanganira kwambara. Gukonjesha buhoro (annealing) ukoresheje igice cyo kubika ubushyuhe kuri 10-50 ° C / h cyangwa gukonjesha itanura - iminyururu ya molekile itondekanya neza muri spherulite nini yuzuye; gutwikira bifite ubukana bwinshi, kwihanganira kwambara bidasanzwe, ibipimo bihamye, kugabanya guhinduka no kwiyongera.

Iyi ngingo ikubiyemo ikoreshwa rya Teflon yimyenda yubushyuhe bwo hejuru mu ziko ryumuyaga ushushe. Ibishoboka: birashobora gukoreshwa nkudushumi twinshi ku mukandara wa meshi cyangwa tray mugihe ubushyuhe bwitanura ≤260 ° C (gukama ubushyuhe buke, kuvanaho binder, gukiza ibishishwa) - bitezimbere kumanura no gutora neza. Birabujijwe cyane ku bushyuhe bwo hagati / hejuru (300-950 ° C) - PTFE ibora kurekura ubumara bwa HF na perfluoroisobutylene, ibikoresho byangiza kandi bitera uburozi bwica. Ihame ryumutekano: niba ubushyuhe bwitanura budasobanutse cyangwa budashobora kwemezwa munsi ya 260 ° C, ntukoreshe. Umutungo wingenzi: serivisi zihoraho -70 ° C kugeza 260 ° C, igihe gito 300 ° C; gukabya gukabije kutagira inkoni na chimique; amashanyarazi meza cyane; ubukana buke (~ 0.04); base ya fiberglass itanga imbaraga zingana.

Iyi ngingo igereranya itandukaniro riri hagati yo gushyushya imirasire yimirasire nuburyo bwo gushyushya umuyaga ushushe uburyo bwo gukiza uburyo bwo guhuza imiterere ihuza imiterere ya silicone. Uburyo bwo guhererekanya ubushyuhe: ikirere gishyushye gishingiye kuri convection-itwarwa nubushyuhe bworoheje bwiyongera, itandukaniro rito ryimbere / hanze; IR ifite ubujyakuzimu bwimbitse hamwe no kwinjiza cyane (micrometero mirongo kugeza ku magana) bikora hejuru cyane-imbere-imbere. Ingaruka ku guhuza kwambukiranya: umwuka-ushyushye utuma gukira gukira imbere no hanze hamwe n'ubucucike bumwe; IR itera urwego rwo hejuru gukora byihuse 'firime yuruhu ' ibuza gutwara ubushyuhe no kugenda kwimbere imbere, bigatuma ubucucike bwambukiranya bugabanuka kuva hejuru kugeza imbere.

Iyi ngingo ikubiyemo itandukaniro riri hagati ya emulisiyo ya PTFE ikorwa no guhagarikwa polymerisation vs dispersion polymerisation. Ibisobanuro: guhagarika polymerisation ntibishobora kubyara PTFE; emulioni ya PTFE nyayo ituruka gusa kuri dispersion polymerisation. 'Guhagarika-uburyo bwa emulsion ' mubyukuri ni ihagarikwa ryamazi yo guhagarika ubutaka-polymerized resin micropowders. Dispersion polymerisation (emulsion primaire): uduce duto twa sherfike (0.1-0.3μm, gukwirakwiza kwagutse), gutunganijwe na surfactants ya perfluorine, uburemere buke cyane bwa molekile (> 94% kristalline), fibrillation ikomeye, bisaba gucumura 380 ° C kugirango ikore firime ikomeza.

Iyi ngingo ikubiyemo uburyo bwo guhuza ubushyuhe bwangirika hamwe nubuzima bwa kimwe cya kabiri cya peroxide ihuza ibintu (BPO na DCP) hamwe nidirishya ryo gukiza kaseti ya Teflon. Amakuru yibanze: BPO - 1-min igice cyubuzima kuri ~ 131 ° C, 1-isaha kuri ~ 92 ° C, 10-isaha kuri ~ 72 ° C; DCP - 1-min kuri ~ 171 ° C, 1-isaha kuri ~ 135 ° C, 10-isaha kuri ~ 115 ° C. Guhuza logique: gufatira gukenera 97-99% guhuza = 5-7 igice cyubuzima; gukiza igihe = 5-7 × igice cyubuzima ku bushyuhe bwintego. Inyuma-kubara ubushyuhe uhereye kumurongo wo guturamo igihe cyangwa kugaruka-kubara igihe uhereye kubushyuhe bwemewe.

Iyi ngingo ikubiyemo umurongo wihuta wumurongo wa PTFE yubushyuhe bwo hejuru bwimyenda yumurongo. Umuvuduko usanzwe: 2-15 m / min, urwego ruhoraho rukora 3-8 m / min, imyenda yoroheje / imirongo yihuta kugera kuri 10-15 m / min. Inzitizi zituruka ku kwinjirira mu nda: imyenda igomba kuba yuzuyemo emulioni ya PTFE muri fibre bundle imbere - umuvuduko mwinshi utera gusama bidahagije, inzara yinzara hamwe na fibre yumye; emulsion viscosity, solide yibanze, imyenda yububoshyi byose bigabanya umuvuduko winjira, bisaba umuvuduko muke kumyenda yuzuye / yuzuye. Impapuro zipfundikirwa: passe nyinshi (2-6 +) zisabwa kugirango uburinganire bwuzuye butagira inenge; ubanza gutsindira gahoro gahoro, ibyakurikiyeho birashobora kwiyongera muburyo bugaragara.

Iyi ngingo igereranya itandukaniro riri hagati yubushyuhe bwimirasire yubushyuhe hamwe nubushyuhe bwumuyaga ushyushye kumiterere ihuza imiterere ya silicone yometse kumurongo. Uburyo bwo guhererekanya ubushyuhe: umuyaga ushyushye ni convection-itwara, yoroheje kandi itera imbere, ikora ubushyuhe buringaniye; IR ni imishwarara-yinjiza hamwe nubutaka bukabije (micrometero kugeza kuri milimetero) bikora hejuru cyane-imbere-imbere. Ingaruka ku gukwirakwiza ubucucike: umuyaga ushyushye utuma ibice by'imbere n'inyuma byinjira mu bushyuhe bw’ibirunga hafi icyarimwe, bigatanga ubucucike bumwe bwimbitse; IR itera urwego rwo hejuru gukira ako kanya rukora uruhu rwinshi rubuza ihererekanyabubasha, bikavamo gradient ikaze yubucucike bwa crosslink igabanuka kuva imbere imbere.

Iyi ngingo ikubiyemo ibintu bya silika hamwe na ssenariyo yerekana ibirahuri bya silika yo hejuru. Ibisobanuro bya Silica: ibipimo fatizo ni SiO₂ ≥96% (bisanzwe 96-98%, amanota yo hejuru> 99% ukoresheje acide acide no gucumura, wegera fibre nziza ya quartz). Gukora: Umwenda wa E-ikirahuri unyuramo aside ishyushye kugirango ushongeshe ibice bitari silika (oxyde ya boron, sodium oxyde), bigakora skeleton yo hejuru-silika, hanyuma igacumura kugirango yongere. Ibyiza byingenzi: serivisi zihoraho kuri 900 ° C mukwangiza ikirere, mugihe gito hejuru ya 1200 ° C, koroshya hafi ya 1700 ° C; imiti ihamye irwanya aside / alkalis nyinshi usibye HF na aside fosifori ishyushye; munsi ya dielectric ihoraho kandi ihamye kubushyuhe bwinshi.

Iyi ngingo isobanura microstructural ibiranga Teflon umwenda wo hejuru. Substrate skeleton: ibirahuri byo kuboha ibirahuri mubudodo busanzwe / twill hamwe nububasha bwinshi (micron-nini ya pore iri muri fibre bundles no kuri warp-weft node) itanga umwanya wo gutera PTFE. Coating morphologie: enapsulasiyo yuzuye igizwe 'ibyuma bishimangira beto ' aho fibre yibirahure ikomeza icyiciro, PTFE ni matrix ikomeza; microstructure ya nodular yubuso bwa nodules (uduce) ihujwe na fibrile nziza yakozwe mugihe cyo gucumura; uruhu rwinshi rwuruhu (byinshi kugeza kuri mirongo ya microne yuburebure) bwa PTFE nkinzitizi yingenzi yo kutagira imiti, imiterere idafite inkoni, hamwe n’amashanyarazi.