Sil\u012bcija karb\u012bda \u0161\u0137iedra ir augstas veiktsp\u0113jas keramikas materi\u0101ls ar daudz\u0101m priek\u0161roc\u012bb\u0101m, tostarp iztur\u012bbu pret oksid\u0113\u0161anos augst\u0101 temperat\u016br\u0101, ciet\u012bbu, iztur\u012bbu un zemu bl\u012bvumu. Turkl\u0101t tai piem\u012bt izcila iztur\u012bba pret koroziju un termisk\u0101 stabilit\u0101te.<\/p>\n
COVID-19 ir negat\u012bvi ietekm\u0113jis piepras\u012bjumu un pieg\u0101des \u0137\u0113des daudz\u0101s nozar\u0113s, izraisot ra\u017eo\u0161anas apjoma samazin\u0101\u0161anos kosmosa un aizsardz\u012bbas nozares ra\u017eot\u0101ju vid\u016b.<\/p>\n
Sil\u012bcija karb\u012bda \u0161\u0137iedras izce\u013cas k\u0101 izcila izv\u0113le met\u0101la un keramikas matricas kompoz\u012btiem, pateicoties to \u0101rk\u0101rt\u0113jai iztur\u012bbai pret augst\u0101m temperat\u016br\u0101m, ko nodro\u0161ina to izcil\u0101 l\u016bzuma iztur\u012bba un iztur\u012bba pret oksid\u0101ciju, kas \u013cauj t\u0101m saglab\u0101t savu integrit\u0101ti temperat\u016br\u0101s, kas p\u0101rsniedz 1000 F (540 \u00b0F). To stabilit\u0101te balst\u0101s uz zemo sk\u0101bek\u013ca saturu, kas nodro\u0161ina stabilit\u0101ti augst\u0101s temperat\u016br\u0101s ilgtermi\u0146\u0101.<\/p>\n
\u0160is materi\u0101ls ir viegla, ta\u010du augstas veiktsp\u0113jas alternat\u012bva ni\u0137e\u013ca b\u0101zes supersakaus\u0113jumiem, nodro\u0161inot l\u012bdz\u012bgu iztur\u012bbu, siltumiztur\u012bbu un \u0137\u012bmisko inerciju, vienlaikus b\u016bdams viegl\u0101ks un iztur\u012bg\u0101ks. Turkl\u0101t t\u0101 \u0137\u012bmisk\u0101 inercija noz\u012bm\u0113, ka tas ir iztur\u012bgs pret koroziju, k\u0101 ar\u012b \u0137\u012bmisko iedarb\u012bbu.<\/p>\n
Ir izstr\u0101d\u0101ts inovat\u012bvs ra\u017eo\u0161anas process, kas \u013cauj izgatavot augsttemperat\u016brai iztur\u012bgas sil\u012bcija karb\u012bda \u0161\u0137iedras. K\u0101 izejmateri\u0101lu izmanto zemas molekulmasas sil\u0101nu (LPS) un to rea\u0123\u0113 ar organisko savienojumu, kas satur bl\u012bvino\u0161us elementus, lai ieg\u016btu AL un Y saturo\u0161u polikarbosil\u0101nu (PACS un PYCS), no kura p\u0113c tam, izmantojot kaus\u0113\u0161anas v\u0113rp\u0161anas tehnolo\u0123iju, tiek v\u0113rptas nep\u0101rtrauktas \u0161\u0137iedras, kuras p\u0113c tam tiek sa\u0137epin\u0101tas, veidojot augsttemperat\u016brai iztur\u012bgas SiC \u0161\u0137iedras.<\/p>\n
Sil\u012bcija karb\u012bda \u0161\u0137iedra ir iztur\u012bgs materi\u0101ls, kas sp\u0113j iztur\u0113t ekstrem\u0101las temperat\u016bras. Pateicoties t\u0101s stehiometriskajam sast\u0101vam un polikrist\u0101liskajai mikrostrukt\u016brai, \u0161is materi\u0101ls nodro\u0161ina augstu stiepes iztur\u012bbu, savuk\u0101rt t\u0101 ciet\u012bba un \u0137\u012bmisk\u0101 iztur\u012bba padara to piem\u0113rotu met\u0101la r\u016bd\u012b\u0161anas procesiem, k\u0101 ar\u012b e\u013c\u013cas dzes\u0113\u0161anai met\u0101la r\u016bd\u012b\u0161anas darb\u012bb\u0101s. Turkl\u0101t sil\u012bcija karb\u012bds sp\u0113j iztur\u0113t augsta spiediena vidi, t\u0101d\u0113j\u0101di padarot to par lielisku risin\u0101jumu e\u013c\u013cas s\u016bk\u0146u bl\u012bv\u0113m, k\u0101 ar\u012b citiem meh\u0101niskajiem izstr\u0101d\u0101jumiem, kas darbojas \u0161\u0101dos apst\u0101k\u013cos.<\/p>\n
Paredzams, ka kosmosa un milit\u0101r\u0101s ra\u017eo\u0161anas apjoma pieaugums, NASA finans\u0113juma palielin\u0101jums un citi faktori izrais\u012bs piepras\u012bjuma pieaugumu Zieme\u013camerik\u0101 p\u0113c sil\u012bcija karb\u012bda \u0161\u0137iedras, ko izmanto gan sporta automa\u0161\u012bnu keramiskajos brem\u017eu diskos, gan bru\u0146u vest\u0113s.<\/p>\n
NASA Glena p\u0113tniec\u012bbas centrs ir izstr\u0101d\u0101jis mikrovi\u013c\u0146u procesu, kas \u013cauj ra\u017eot iztur\u012bg\u0101kus SiC pavedienus, pal\u012bdzot ra\u017eot\u0101jiem samazin\u0101t ener\u0123ijas pat\u0113ri\u0146u, apstr\u0101des temperat\u016bru un apstr\u0101des laiku, k\u0101 ar\u012b atjaunot boj\u0101tus vai zemas kvalit\u0101tes SiC pavedienus, lai uzlabotu to veiktsp\u0113ju. Turkl\u0101t \u0161is inovat\u012bvais process \u013cauj ietaup\u012bt darbasp\u0113ka izmaksas, vienlaikus palielinot izmantojamo SiC izn\u0101kumu.<\/p>\n
Sil\u012bcija karb\u012bda \u0161\u0137iedras ir paz\u012bstamas k\u0101 \u0101rk\u0101rt\u012bgi iztur\u012bgi un ilgm\u016b\u017e\u012bgi materi\u0101li ar izcilu siltumvad\u012btsp\u0113ju un iztur\u012bbu pret termisko izple\u0161anos, k\u0101 ar\u012b ar iztur\u012bbu pret koroziju, augstu modu\u013ca stingr\u012bbu un zemiem termisk\u0101s izple\u0161an\u0101s koeficientiem un iztur\u012bbas r\u0101d\u012bt\u0101jiem \u2014 \u0161\u012bs \u012bpa\u0161\u012bbas padara t\u0101s piem\u0113rotas e\u013c\u013cas dzes\u0113\u0161anas procesiem met\u0101la r\u016bd\u012b\u0161an\u0101, k\u0101 ar\u012b izmanto\u0161anai nodilumiztur\u012bgos materi\u0101los vai keramikas matricas kompoz\u012btos.<\/p>\n
Sil\u012bcija karb\u012bda \u0161\u0137iedru tirgus izaugsme Nep\u0101rtrauktas ra\u017eo\u0161anas sil\u012bcija karb\u012bda \u0161\u0137iedru tirgus strauji papla\u0161in\u0101s, pateicoties kosmosa un aizsardz\u012bbas nozares piepras\u012bjumam p\u0113c viegl\u0101m deta\u013c\u0101m. Pateicoties izcilajai iztur\u012bbai pret oksid\u0101ciju un \u0137\u012bmiskajai t\u012br\u012bbai, nep\u0101rtrauktas sil\u012bcija karb\u012bda \u0161\u0137iedras tiek izmantotas daudzos pielietojumos; savuk\u0101rt aust\u0101s sil\u012bcija karb\u012bda \u0161\u0137iedras var b\u016bt piem\u0113rotas pat augstas temperat\u016bras lietojumiem, piem\u0113ram, kodolreaktoros vai metalur\u0123iskaj\u0101s kr\u0101sn\u012bs.<\/p>\n
Lai izp\u0113t\u012btu m\u016bsu laboratorij\u0101 ra\u017eoto SiC-9 un SiC-14 \u0161\u0137iedru virsmas morfolo\u0123iju, tika izmantota SEM. Sk\u0101bek\u013ca saturs \u0161ajos paraugos bija tikai 0,07 masas procenti \u2013 iev\u0113rojami zem\u0101ks par to SiC stehiometrisko attiec\u012bbu. Termisk\u0101 stabilit\u0101te bija izcila, un pat ilgsto\u0161as termisk\u0101s apstr\u0101des laik\u0101 netika nov\u0113rotas nek\u0101das izmai\u0146as.<\/p>\n
Sil\u012bcija karb\u012bda \u0161\u0137iedras ir moderns keramikas materi\u0101ls ar izcil\u0101m termisk\u0101m, \u0137\u012bmisk\u0101m un meh\u0101nisk\u0101m \u012bpa\u0161\u012bb\u0101m. To sp\u0113ja iztur\u0113t augstas temperat\u016bras padara t\u0101s piem\u0113rotas lietojumiem, kuros citi materi\u0101li \u0101tri saboj\u0101tos vai zaud\u0113tu savas \u012bpa\u0161\u012bbas; savuk\u0101rt to iztur\u012bba pret l\u0113n\u0101s deform\u0101cijas, oksid\u0101cijas un noguruma ietekmi padara t\u0101s par piem\u0113rotiem materi\u0101liem izmanto\u0161anai kosmosa un milit\u0101raj\u0101 apr\u012bkojum\u0101.<\/p>\n
SiC \u0161\u0137iedru iztur\u012bba pret koroziju izriet no to zem\u0101 poru bl\u012bvuma un liel\u0101s \u012bpatn\u0113j\u0101s virsmas, kas pan\u0101kta, izmantojot infiltr\u0101cijas-pirol\u012bzes procesu. No prekursoru molekul\u0101m izdal\u012btais polikarbosil\u0101ns iek\u013c\u016bst por\u0101s, veidojot sekund\u0101ro sil\u012bcija karb\u012bdu, kas savuk\u0101rt samazina poru izm\u0113ru; \u0161aj\u0101 posm\u0101 izgatavotie neapstr\u0101d\u0101tie paraugi tiek pak\u013cauti vair\u0101kiem infiltr\u0101cijas-pirol\u012bzes cikliem, kas palielina to bl\u012bvumu, vienlaikus samazinot porain\u012bbu.<\/p>\n
COVID-19 pand\u0113mija ir izrais\u012bjusi haosu daudzu nozaru pieg\u0101des un piepras\u012bjuma \u0137\u0113d\u0113s. Daudzas r\u016bpn\u012bcas ir sl\u0113gtas, savuk\u0101rt aviokomp\u0101nijas un aizsardz\u012bbas r\u016bpniec\u012bba saskaras ar gr\u016bt\u012bb\u0101m sav\u0101 darb\u012bb\u0101 ce\u013co\u0161anas un kravu p\u0101rvad\u0101jumu ierobe\u017eojumu d\u0113\u013c.<\/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\/lv\/wp-json\/wp\/v2\/posts\/52","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/comments?post=52"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/52\/revisions"}],"predecessor-version":[{"id":53,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/posts\/52\/revisions\/53"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/media?parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/categories?post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/lv\/wp-json\/wp\/v2\/tags?post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}