Karbid krem\u00edka je ide\u00e1lnou alternat\u00edvou k supersliatin\u00e1m na b\u00e1ze niklu pre komponenty vy\u017eaduj\u00face vysok\u00fa tepeln\u00fa odolnos\u0165, pon\u00faka v\u00fdnimo\u010dn\u00fa chemick\u00fa a oxida\u010dn\u00fa odolnos\u0165, pevnos\u0165 pri extr\u00e9mnych teplot\u00e1ch, n\u00edzku tepeln\u00fa roz\u0165a\u017enos\u0165 a dobr\u00e9 mechanick\u00e9 vlastnosti.<\/p>\n
Krajiny na celom svete r\u00fdchlo buduj\u00fa jadrov\u00e9 zariadenia, \u010do zvy\u0161uje dopyt po karbide krem\u00edka na energetick\u00e9 a energetick\u00e9 aplik\u00e1cie. Tento materi\u00e1l sa vo ve\u013ekej miere vyu\u017e\u00edva aj v kovospracuj\u00facom priemysle.<\/p>\n
Karbid krem\u00edka je v\u00fdnimo\u010dne odoln\u00fd keramick\u00fd materi\u00e1l zlo\u017een\u00fd z uhl\u00edka a krem\u00edka, ktor\u00e9 tvoria jeho z\u00e1kladn\u00e9 zlo\u017eky. Ako vl\u00e1kno s n\u00edzkou hustotou, ktor\u00e9 si zachov\u00e1va vynikaj\u00face vlastnosti v extr\u00e9mnych podmienkach, m\u00e1 karbid krem\u00edka mnoho v\u00fdhod, ako je odolnos\u0165 vo\u010di teplotnej oxid\u00e1cii, tvrdos\u0165, pevnos\u0165 a chemick\u00e1 stabilita - vlastnosti, ktor\u00e9 umo\u017e\u0148uj\u00fa jeho pou\u017eitie v civiln\u00fdch priemyseln\u00fdch aspektoch, ako aj na in\u00e9 \u00fa\u010dely.<\/p>\n
Medzi najob\u013e\u00fabenej\u0161ie segmenty patrili leteck\u00fd a kozmick\u00fd priemysel a energetika. Oba boli poh\u00e1\u0148an\u00e9 rast\u00facim pou\u017e\u00edvan\u00edm karbidu krem\u00edka v trysk\u00e1ch pr\u00fadov\u00fdch motorov, pohonn\u00fdch syst\u00e9moch, kon\u0161truk\u010dn\u00fdch \u010dastiach leteck\u00fdch motorov a in\u00fdch \u010dastiach. Ni\u017e\u0161ia hustota vl\u00e1kien karbidu silik\u00f3nu v porovnan\u00ed s ich kovov\u00fdmi ekvivalentmi umo\u017e\u0148uje leteck\u00fdm motorom lieta\u0165 pri vy\u0161\u0161\u00edch r\u00fdchlostiach s v\u00e4\u010d\u0161\u00edm dosahom.<\/p>\n
Elektrick\u00e9 zariadenia a polovodi\u010de vyu\u017e\u00edvaj\u00face meden\u00fd dr\u00f4t sa vo ve\u013ekej miere vyr\u00e1baj\u00fa z neho ako z materi\u00e1lu, ktor\u00fd je v\u010faka svojej chemickej \u010distote, odolnosti vo\u010di oxid\u00e1cii a vynikaj\u00facej elektrickej vodivosti ob\u013e\u00faben\u00fd pri v\u00fdrobe podlo\u017eiek a vank\u00fa\u0161ikov v polovodi\u010dov\u00fdch peciach, ako aj ako k\u013e\u00fa\u010dov\u00e9 komponenty pri v\u00fdrobe termistorov a varistorov.<\/p>\n
Dopyt po karbide krem\u00edka v sektore energetiky a energetiky neust\u00e1le rastie v d\u00f4sledku rast\u00faceho vyu\u017e\u00edvania obnovite\u013en\u00fdch zdrojov energie a prechodu spolo\u010dnosti ME&A na plynov\u00e9 turb\u00edny, ktor\u00e9 zvy\u0161uj\u00fa \u00fa\u010dinnos\u0165 paliva a z\u00e1rove\u0148 zni\u017euj\u00fa zne\u010distenie ovzdu\u0161ia a emisie uhl\u00edka. V\u010faka ich vysokej teplotnej tolerancii je karbid krem\u00edka ide\u00e1lnym materi\u00e1lom na stavbu motorov plynov\u00fdch turb\u00edn.<\/p>\n
Vl\u00e1kna karbidu krem\u00edka s\u00fa ve\u013emi vhodn\u00e9 na pou\u017eitie v aplik\u00e1ci\u00e1ch kompozitov s kovovou matricou v\u010faka v\u00fdnimo\u010dnej kombin\u00e1cii pevnosti a tuhosti, n\u00edzkemu koeficientu tepelnej roz\u0165a\u017enosti, elektrickej vodivosti a odolnosti vo\u010di kor\u00f3zii a oxid\u00e1cii pri vysok\u00fdch teplot\u00e1ch. Okrem toho ich \u013eahk\u00e9 a z\u00e1rove\u0148 pevn\u00e9 vlastnosti ich predur\u010duj\u00fa na pou\u017eitie v leteckom a kozmickom priemysle, zatia\u013e \u010do ich odolnos\u0165 proti opotrebovaniu z nich rob\u00ed skvel\u00e9 materi\u00e1ly odoln\u00e9 proti opotrebovaniu s v\u00fdnimo\u010dn\u00fdmi vlastnos\u0165ami proti oderu.<\/p>\n
Severoamerick\u00e9 trhy za\u017e\u00edvaj\u00fa r\u00fdchlu expanziu v d\u00f4sledku rast\u00facich v\u00fddavkov na obranu a dopytu po lietadl\u00e1ch, \u010do podporuje rast karbidu krem\u00edka v celom regi\u00f3ne. Okrem toho by zv\u00fd\u0161en\u00e9 financovanie NASA malo vies\u0165 k \u010fal\u0161\u00edm v\u00fdskumn\u00fdm a v\u00fdvojov\u00fdm pr\u00e1cam v oblasti leteckej a vesm\u00edrnej technol\u00f3gie.<\/p>\n
V\u00fdroba karbidu krem\u00edka zah\u0155\u0148a nieko\u013eko met\u00f3d, pri\u010dom jedna z najsofistikovanej\u0161\u00edch je zn\u00e1ma ako proces Yajima. Ten spo\u010d\u00edva v zahrievan\u00ed kremi\u010dit\u00e9ho piesku s uhl\u00edkom v \u0161peci\u00e1lnej peci, \u010d\u00edm sa z\u00edskaj\u00fa kry\u0161talick\u00e9 zrn\u00e1 karbidu krem\u00edka, ktor\u00e9 sa potom nan\u00e1\u0161aj\u00fa na substr\u00e1ty a vytv\u00e1raj\u00fa vl\u00e1kna r\u00f4znych farieb v z\u00e1vislosti od ich \u010distoty - zelen\u00e9 alebo \u010dierne s\u00fa zvy\u010dajne vidite\u013en\u00e9 v z\u00e1vislosti od toho, ak\u00fd materi\u00e1l sa pou\u017eil na ich vytvorenie.<\/p>\n
Karbid krem\u00edka sa naj\u010dastej\u0161ie pou\u017e\u00edva na v\u00fdrobu kompozitov s kovovou a keramickou matricou a karbid krem\u00edka SCS od spolo\u010dnosti Specialty Materials sa vyzna\u010duje najvy\u0161\u0161ou teplotnou odolnos\u0165ou a nepretr\u017eit\u00fdm \u0165ahan\u00edm kart\u00f3nov\u00fdch cievok s d\u013a\u017ekou vl\u00e1kna a\u017e 800 metrov, ktor\u00e9 je mo\u017en\u00e9 zak\u00fapi\u0165.<\/p>\n
Vl\u00e1kna karbidu krem\u00edka sa stali nepostr\u00e1date\u013en\u00fdm materi\u00e1lom pre vysokoteplotn\u00e9 chemick\u00e9 aplik\u00e1cie vr\u00e1tane komponentov pre leteck\u00fd a automobilov\u00fd priemysel, jadrov\u00e9 reaktory a chemick\u00fd priemysel. Ich vynikaj\u00faca chemick\u00e1 stabilita a tepeln\u00e1 odolnos\u0165 im umo\u017e\u0148uje odol\u00e1va\u0165 teplot\u00e1m a\u017e do 2700 stup\u0148ov Fahrenheita; v\u010faka svojej pevnosti a pru\u017enosti s\u00fa vhodn\u00e9 pre vysoko v\u00fdkonn\u00e9 kompozitn\u00e9 materi\u00e1ly zlo\u017een\u00e9 z keramick\u00fdch alebo kovov\u00fdch matr\u00edc, ktor\u00e9 tvoria \u0161truktur\u00e1lne alebo tepeln\u00e9 kompozitn\u00e9 \u0161trukt\u00fary.<\/p>\n
Leteck\u00fd priemysel vyu\u017e\u00edva vl\u00e1kna SiC na v\u00fdrobu \u013eahk\u00fdch a z\u00e1rove\u0148 dlhotrvaj\u00facich komponentov lietadiel vr\u00e1tane \u010dast\u00ed motorov a turb\u00edn. Vl\u00e1kna SiC maj\u00fa oproti svojim n\u00e1protivkom z kovov\u00fdch zliatin mnoho v\u00fdhod - v porovnan\u00ed s kovov\u00fdmi zliatinami s\u00fa dvakr\u00e1t pevnej\u0161ie a 20% odolnej\u0161ie vo\u010di vysok\u00fdm teplot\u00e1m; navy\u0161e odol\u00e1vaj\u00fa n\u00e1ro\u010dn\u00fdm podmienkam prostredia bez straty pevnosti.<\/p>\n
V\u00fdroba karbidu krem\u00edka zah\u0155\u0148a nieko\u013eko v\u00fdrobn\u00fdch pr\u00edstupov. Jeden z tak\u00fdchto postupov, ktor\u00fd prv\u00fdkr\u00e1t predstavil Yajima v roku 1975, vyu\u017e\u00edva pyrol\u00fdzu organokremi\u010dit\u00fdch polym\u00e9rov na v\u00fdrobu vl\u00e1kien s mal\u00fdm priemerom a ide\u00e1lnym zlo\u017een\u00edm, ktor\u00e9 sa dod\u00e1vaj\u00fa v sto\u010den\u00fdch vl\u00e1knach s pevnos\u0165ou v \u0165ahu 10 giganewtonov na palec.<\/p>\n
Aj napriek t\u00fdmto v\u00fdhod\u00e1m zost\u00e1vaj\u00fa n\u00e1klady na materi\u00e1l pre v\u00e4\u010d\u0161inu aplik\u00e1ci\u00ed ne\u00fanosne vysok\u00e9. Aby v\u00fdrobcovia zn\u00ed\u017eili n\u00e1klady a dostali ich na dosah, musia zn\u00ed\u017ei\u0165 v\u00fdrobn\u00e9 procesy a z\u00e1rove\u0148 zlep\u0161i\u0165 kvalitu v\u00fdrobkov; mali by tie\u017e vyvin\u00fa\u0165 robustn\u00e9 technol\u00f3gie sp\u00e1jania a integr\u00e1cie vhodn\u00e9 do prostredia s vysok\u00fdmi teplotami, ako je sp\u00e1jkovanie, dif\u00fazne sp\u00e1janie ARCJoinT a technol\u00f3gie sp\u00e1jania REABOND.<\/p>\n
Vl\u00e1kna karbidu krem\u00edka na\u0161li ve\u013ek\u00e9 uplatnenie v leteckom sektore, kde s\u00fa v\u010faka svojim vlastnostiam, ako je odolnos\u0165 vo\u010di vysok\u00fdm teplot\u00e1m, ochrana proti kor\u00f3zii a odolnos\u0165 proti opotrebovaniu, neocenite\u013en\u00fdm materi\u00e1lom. Karbid krem\u00edka je obzvl\u00e1\u0161\u0165 u\u017eito\u010dn\u00fd pri odol\u00e1van\u00ed vysok\u00e9mu nam\u00e1haniu spojen\u00e9mu s leteckou v\u00fdrobou - \u010do bude \u010falej zvy\u0161ova\u0165 jeho dopyt.<\/p>\n
Karbid krem\u00edka je keramick\u00fd materi\u00e1l zlo\u017een\u00fd z uhl\u00edka a krem\u00edka ako hlavn\u00fdch zlo\u017eiek, ktor\u00fd sa vyzna\u010duje mnoh\u00fdmi \u017eiaducimi vlastnos\u0165ami, ako je vynikaj\u00faca odolnos\u0165 vo\u010di oxid\u00e1cii a kor\u00f3zii pri teplot\u00e1ch a\u017e do 2700 stup\u0148ov Celzia, vysok\u00e1 pevnos\u0165, n\u00edzka hustota, aplik\u00e1cie na izol\u00e1ciu tepeln\u00fdch motorov a kompozitn\u00e9 aplik\u00e1cie s keramickou matricou.<\/p>\n
O\u010dak\u00e1va sa, \u017ee severoamerick\u00fd trh s karbidom krem\u00edka bude po\u010das progn\u00f3zovan\u00e9ho obdobia r\u00fdchlo expandova\u0165. Leteck\u00fd a obrann\u00fd sektor v Severnej Amerike r\u00fdchlo expanduje v\u010faka rast\u00facim vojensk\u00fdm v\u00fddavkom a zv\u00fd\u0161enej potrebe komer\u010dn\u00fdch lietadiel. Tento trend vedie k v\u00fdrazn\u00e9mu n\u00e1rastu priemyselnej v\u00fdroby. Okrem toho je dopyt po karbidov\u00fdch vl\u00e1knach krem\u00edka podporovan\u00fd aj expanziou v oblasti v\u00fdroby jadrovej energie.<\/p>\n
Kontinu\u00e1lne vl\u00e1kna b-SiC s\u00fa vhodn\u00e9 pre mnoh\u00e9 vysokoteplotn\u00e9 aplik\u00e1cie, najm\u00e4 v jadrovej energetike. V\u010faka svojej \u013eahkej a z\u00e1rove\u0148 odolnej povahe s\u00fa vhodn\u00e9 na dobr\u00e9 fungovanie v prostred\u00ed vystavenom \u017eiareniu - vlastnosti, ktor\u00e9 ich predur\u010duj\u00fa na v\u00fdrobu kompozitov s keramickou matricou a pokro\u010dil\u00fdch \u0161trukt\u00far, ako aj na pou\u017eitie v letectve a obrane, kde sa kontinu\u00e1lne vl\u00e1kna daj\u00fa \u013eahko vplieta\u0165 do architektonick\u00fdch predliskov v tvare komponentov.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide fiber is an ideal alternative to nickel-based superalloys for components requiring high heat resistance, offering exceptional chemical and oxidation resistance, strength at extreme temperatures, low thermal expansion rates and good mechanical properties. Countries across the globe are rapidly building nuclear facilities, driving up demand for silicon carbide fiber for energy & power applications. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","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":[64],"tags":[],"class_list":["post-228","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts\/228","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/comments?post=228"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts\/228\/revisions"}],"predecessor-version":[{"id":229,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/posts\/228\/revisions\/229"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/media?parent=228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/categories?post=228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/sk\/wp-json\/wp\/v2\/tags?post=228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}