Silicio karbido pluo\u0161tas yra auk\u0161tos kokyb\u0117s keramin\u0117 med\u017eiaga, turinti daug privalum\u0173, tarp kuri\u0173 \u2013 atsparumas oksidacijai auk\u0161toje temperat\u016broje, kietumas, stiprumas ir ma\u017eas tankis. Be to, ji pasi\u017eymi puikiomis atsparumo korozijai ir terminio stabilumo savyb\u0117mis.<\/p>\n
COVID-19 tur\u0117jo neigiam\u0105 poveik\u012f daugelio pramon\u0117s \u0161ak\u0173 paklausai ir tiekimo grandin\u0117ms, d\u0117l ko sul\u0117t\u0117jo aviacijos, kosmoso ir gynybos pramon\u0117s gamintoj\u0173 gamyba.<\/p>\n
Silicio karbido pluo\u0161tai i\u0161siskiria kaip puikus pasirinkimas metal\u0173 ir keramikos matricos kompozitams d\u0117l savo ypatingo atsparumo itin auk\u0161toms temperat\u016broms \u2013 i\u0161skirtinio atsparumo l\u016b\u017eimui ir oksidacijai, leid\u017eian\u010dio jiems i\u0161likti nepaliestiems esant temperat\u016brai, vir\u0161ijan\u010diai 1000 F (540 \u00b0F). J\u0173 stabilumas grind\u017eiamas ma\u017eu deguonies kiekiu, kuris u\u017etikrina ilgalaik\u012f stabilum\u0105 auk\u0161toje temperat\u016broje.<\/p>\n
\u0160i med\u017eiaga yra lengva, ta\u010diau labai veiksminga alternatyva nikelio pagrindu pagamintiems superlegeriams: ji pasi\u017eymi pana\u0161iu stiprumu, atsparumu kar\u0161\u010diui ir cheminiu inerti\u0161kumu, ta\u010diau yra lengvesn\u0117 ir patvaresn\u0117. Be to, d\u0117l savo cheminio inerti\u0161kumo ji atspari korozijai ir cheminiam poveikiui.<\/p>\n
Sukurtas novatori\u0161kas auk\u0161tai temperat\u016brai atspari\u0173 silicio karbido pluo\u0161t\u0173 gamybos procesas. Naudojant ma\u017eos molekulin\u0117s mas\u0117s silan\u0105 (LPS) kaip \u017ealiav\u0105 ir reaguojant j\u012f su organiniu junginiu, kuriame yra tankinan\u010di\u0173 element\u0173, gaunami AL ir Y turintys polikarbosilanai (PACS ir PYCS), i\u0161 kuri\u0173 i\u0161tisiniai pluo\u0161tai v\u0117liau verpiami naudojant lydymo verpimo technologij\u0105, o po to sukepinami, kad susidaryt\u0173 auk\u0161tai temperat\u016brai atspar\u016bs SiC pluo\u0161tai.<\/p>\n
Silicio karbido pluo\u0161tas yra tvirta med\u017eiaga, atspari ekstremalioms temperat\u016broms. D\u0117l savo stechiometrin\u0117s sud\u0117ties ir polikristalin\u0117s mikrostrukt\u016bros \u0161i med\u017eiaga pasi\u017eymi dideliu tempiamuoju stiprumu, o jos kietumas ir atsparumas cheminiam poveikiui leid\u017eia j\u0105 naudoti metalo gr\u016bdinimo procesuose bei alyvos au\u0161inimo operacijose, atliekant metalo gr\u016bdinim\u0105. Be to, silicio karbidas gali atlaikyti auk\u0161to sl\u0117gio s\u0105lygas, tod\u0117l tai yra puikus pasirinkimas alyvos siurbli\u0173 sandarikliams bei kitiems mechaniniams gaminiams, veikiantiems tokiomis aplinkyb\u0117mis.<\/p>\n
Tikimasi, kad auganti aviacijos ir karin\u0117s pramon\u0117s gamyba, padid\u0117j\u0119s NASA finansavimas bei kiti veiksniai lems silicio karbido pluo\u0161to paklausos augim\u0105 \u0160iaur\u0117s Amerikoje; \u0161is pluo\u0161tas naudojamas sportini\u0173 automobili\u0173 keraminiuose stabd\u017ei\u0173 diskuose bei neper\u0161aunamose liemen\u0117se.<\/p>\n
NASA Glenno tyrim\u0173 centras suk\u016br\u0117 mikrobang\u0173 technologij\u0105, skirt\u0105 stipresni\u0173 SiC pluo\u0161t\u0173 gamybai, kuri padeda gamintojams suma\u017einti energijos s\u0105naudas, apdorojimo temperat\u016br\u0105 ir trukm\u0119, taip pat atkurti pa\u017eeistus ar prastos kokyb\u0117s SiC pluo\u0161tus, siekiant pagerinti j\u0173 eksploatacines savybes. Be to, \u0161is novatori\u0161kas procesas leid\u017eia sutaupyti darbo s\u0105naud\u0173 ir padidinti nauding\u0105j\u012f SiC i\u0161eig\u0105.<\/p>\n
Silicio karbido pluo\u0161tai \u017einomi kaip ypa\u010d tvirtos ir patvarios med\u017eiagos, pasi\u017eymin\u010dios puikiu \u0161ilumos laidumu ir atsparumu \u0161iluminiam pl\u0117timuisi, atsparios korozijai, turin\u010dios didel\u012f modulin\u012f stiprum\u0105 bei pasi\u017eymin\u010dios ma\u017eais \u0161iluminio pl\u0117timosi koeficientais ir stiprumo savyb\u0117mis \u2013 \u0161ios savyb\u0117s leid\u017eia juos naudoti metal\u0173 gr\u016bdinimo procesuose, kuriuose taikomas au\u0161inimas alyva, taip pat atspariose dilimui med\u017eiagose ar keramikos matricos kompozituose.<\/p>\n
Silicio karbido pluo\u0161to rinkos augimas Nepertraukiamojo silicio karbido pluo\u0161to rinka spar\u010diai ple\u010diasi d\u0117l aviacijos, kosmoso ir gynybos pramon\u0117s paklausos lengviesiems komponentams. D\u0117l puikaus atsparumo oksidacijai ir cheminio grynumo i\u0161tisiniai silicio karbido pluo\u0161tai naudojami daugelyje sri\u010di\u0173; tuo tarpu austi silicio karbido pluo\u0161tai gali b\u016bti tinkami netgi auk\u0161tos temperat\u016bros taikymams, pavyzd\u017eiui, branduoliniuose reaktoriuose ar metalurgin\u0117se krosnyse.<\/p>\n
Naudojant SEM buvo tirta m\u016bs\u0173 laboratorijoje pagamint\u0173 SiC-9 ir SiC-14 pluo\u0161t\u0173 pavir\u0161iaus morfologija. Deguonies kiekis \u0161iuose m\u0117giniuose sudar\u0117 tik 0,07 mas\u0117s procento \u2013 tai \u017eymiai ma\u017eiau nei j\u0173 stechiometrinis SiC santykis. Terminis stabilumas buvo puikus \u2013 net ir po ilgalaiki\u0173 terminio apdorojimo proces\u0173 nebuvo pasteb\u0117ta joki\u0173 poky\u010di\u0173.<\/p>\n
Silicio karbido pluo\u0161tai yra pa\u017eangi keramin\u0117 med\u017eiaga, pasi\u017eyminti puikiomis termin\u0117mis, chemin\u0117mis ir mechanin\u0117mis savyb\u0117mis. D\u0117l savo atsparumo auk\u0161toms temperat\u016broms jie tinka naudoti ten, kur kitos med\u017eiagos greitai susid\u0117v\u0117t\u0173 ar sugest\u0173; o j\u0173 atsparumas \u0161liau\u017eimui, oksidacijai ir nuovargiui leid\u017eia juos s\u0117kmingai taikyti aeronautikos bei karin\u0117s \u012frangos srityse.<\/p>\n
SiC pluo\u0161t\u0173 atsparumas korozijai kyla i\u0161 j\u0173 ma\u017eo por\u0173 tankio ir didelio savitojo pavir\u0161iaus ploto, pasiekto taikant infiltracijos-piroliz\u0117s proces\u0105. Polikarbosilanas i\u0161 pirmtak\u0173 molekuli\u0173 patenka \u012f poras ir sudaro antrin\u012f silicio karbid\u0105, kuris suma\u017eina por\u0173 dyd\u012f; \u0161iuo etapu pagaminti neapdoroti bandiniai v\u0117liau yra apdorojami keliais infiltracijos-piroliz\u0117s ciklais, kurie padidina j\u0173 tank\u012f ir suma\u017eina poringum\u0105.<\/p>\n
COVID-19 pandemija suk\u0117l\u0117 sumai\u0161t\u012f daugelio pramon\u0117s \u0161ak\u0173 pasi\u016blos ir paklausos grandin\u0117se. Daugyb\u0117 gamykl\u0173 sustabd\u0117 veikl\u0105, o oro linijos ir gynybos pramon\u0117 susiduria su veiklos sunkumais d\u0117l kelioni\u0173 ir krovini\u0173 gabenimo apribojim\u0173.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide fiber is a high-performance ceramic material with numerous advantages, including high temperature oxidation resistance, hardness, strength and low […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-52","post","type-post","status-publish","format-standard","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/posts\/52","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/comments?post=52"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/posts\/52\/revisions"}],"predecessor-version":[{"id":53,"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/posts\/52\/revisions\/53"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/media?parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/categories?post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lt\/wp-json\/wp\/v2\/tags?post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}