A reakci\u00f3k\u00f6t\u00e9s\u0171 szil\u00edciumkarbid (RBSC) egy kiv\u00e9telesen kem\u00e9ny \u00e9s er\u0151s ker\u00e1miaanyag, amely kiv\u00e1l\u00f3 mechanikai szil\u00e1rds\u00e1ggal, \u00fct\u00e9s\u00e1ll\u00f3s\u00e1ggal, k\u00e9miai stabilit\u00e1ssal \u00e9s alak\u00edthat\u00f3s\u00e1ggal rendelkezik, \u00edgy k\u00fcl\u00f6nb\u00f6z\u0151 alkalmaz\u00e1sokhoz alkalmas.<\/p>\n
Az RB-SiC a szinterezett szil\u00edciumkarbidhoz k\u00e9pest alacsonyabb kem\u00e9nys\u00e9g\u0171, de k\u00f6nnyebben \u00e9s olcs\u00f3bban gy\u00e1rthat\u00f3, mik\u00f6zben kiv\u00e1l\u00f3 h\u0151\u00e1ll\u00f3s\u00e1gi tulajdons\u00e1gokkal b\u00fcszk\u00e9lkedhet.<\/p>\n
Az RMI-elj\u00e1r\u00e1s a-SiC-r\u00e9szecsk\u00e9ket haszn\u00e1l, amelyeket por\u00f3zus sz\u00e9n-el\u0151form\u00e1ba (G0) \u00e9p\u00edtenek be, majd foly\u00e9kony szil\u00edciummal infiltr\u00e1lj\u00e1k, hogy reakci\u00f3k\u00f6t\u00e9s\u0171 szil\u00edciumkarbidot hozzanak l\u00e9tre. Sajnos azonban a foly\u00e9kony szil\u00edcium az infiltr\u00e1ci\u00f3s folyamat miatt a p\u00f3rusok elt\u00f6m\u0151dhetnek, ez\u00e9rt ebben a tanulm\u00e1nyban t\u00f6bbf\u00e1zis\u00fa szenet alkalmaztak e probl\u00e9ma ellenszerek\u00e9nt \u00e9s az RB-SiC mechanikai tulajdons\u00e1gainak jav\u00edt\u00e1s\u00e1ra.<\/p>\n
A t\u00f6bbf\u00e1zis\u00fa sz\u00e9n finom amorf koromb\u00f3l \u00e9s durva mikrog\u00f6mb alak\u00fa sz\u00e9nb\u0151l \u00e1llt. Foly\u00e9kony szil\u00edciummal val\u00f3 besziv\u00e1rg\u00e1skor a mikrog\u00f6mb alak\u00fa sz\u00e9n elhaszn\u00e1l\u00f3dik, m\u00edg az amorf sz\u00e9n ki tud l\u00e9pni a p\u00f3rusokb\u00f3l, hogy megakad\u00e1lyozza a p\u00f3rust\u00f6lt\u0151 reakci\u00f3k elt\u00f6m\u0151d\u00e9s\u00e9t - \u00edgy a P10F90, P20F80 \u00e9s P30F70 pr\u00f3batesteken megfigyelve a jellegzetes cs\u00facs nem volt jelen, ami arra utal, hogy a t\u00f6bbf\u00e1zis\u00fa sz\u00e9n seg\u00edtett elker\u00fclni ezt a probl\u00e9m\u00e1t \u00e9s jav\u00edtotta a hajl\u00edt\u00f3szil\u00e1rds\u00e1got, ahogy a besziv\u00e1rg\u00e1si h\u0151m\u00e9rs\u00e9klet \u00e9s az \u00e1ztat\u00e1si id\u0151 n\u0151tt.<\/p>\n
Az RB szil\u00edciumkarbidot olvasztott szil\u00edcium por\u00f3zus sz\u00e9n- vagy grafit-el\u0151form\u00e1ba t\u00f6rt\u00e9n\u0151 besziv\u00e1rg\u00e1s\u00e1val \u00e1ll\u00edtj\u00e1k el\u0151, ahol a szil\u00edciumkarbid a sz\u00e9nnel reakci\u00f3ba l\u00e9pve SiC-t k\u00e9pez, \u00e9s egy kiv\u00e1l\u00f3 kop\u00e1s-, \u00fct\u00e9s- \u00e9s vegyszer\u00e1ll\u00f3 ker\u00e1miaanyagot hoz l\u00e9tre, amely k\u00fcl\u00f6nb\u00f6z\u0151 form\u00e1kban \u00e9s m\u00e9retekben kaphat\u00f3, az egyszer\u0171 k\u00fap- \u00e9s h\u00fcvelyform\u00e1kt\u00f3l kezdve a b\u00e1ny\u00e1szati vagy feldolgoz\u00f3iparban haszn\u00e1lt nagyobb m\u00e9ret\u0171 alkatr\u00e9szekig.<\/p>\n
A kompozit prekurzor \u00f6sszet\u00e9tele, k\u00fcl\u00f6n\u00f6sen a PF \u00e9s FA ar\u00e1nya, befoly\u00e1solja a sz\u00e9n \u00e9s a foly\u00e9kony szil\u00edcium k\u00f6z\u00f6tti reakci\u00f3 sebess\u00e9g\u00e9t a magas h\u0151m\u00e9rs\u00e9klet\u0171 pirol\u00edzis sor\u00e1n. A t\u00f6bbf\u00e1zis\u00fa sz\u00e9n fokozza a foly\u00e9kony szil\u00edcium penetr\u00e1ci\u00f3j\u00e1t a por\u00f3zus el\u0151form\u00e1k p\u00f3rusain kereszt\u00fcl; a grad\u00e1lt sz\u00e9nforr\u00e1sok seg\u00edtenek a b-SiC \u00e9s a szabad Si tartalm\u00e1nak szab\u00e1lyoz\u00e1s\u00e1ban.<\/p>\n
Az RB szil\u00edciumkarbid hajl\u00edt\u00f3szil\u00e1rds\u00e1ga \u00e9s rugalmass\u00e1gi modulusa jelent\u0151sen n\u00f6velhet\u0151 a sz\u00e9nforr\u00e1s gondos oszt\u00e1lyoz\u00e1s\u00e1val, a sima fekete \u00e9s feh\u00e9r blokkszemcs\u00e9s fel\u00fcletek kik\u00fcsz\u00f6b\u00f6l\u00e9se miatt, amelyek a hajl\u00edt\u00e1s sor\u00e1n szemcs\u00e9k k\u00f6z\u00f6tti t\u00f6r\u00e9st okoznak.<\/p>\n
A reakci\u00f3k\u00f6t\u00e9s\u0171 szil\u00edciumkarbid ker\u00e1mi\u00e1k termikus tulajdons\u00e1gai a k\u00f6t\u00e9s t\u00edpus\u00e1t\u00f3l \u00e9s ar\u00e1ny\u00e1t\u00f3l f\u00fcggenek. A reakci\u00f3k\u00f6t\u00e9ses szil\u00edciumkarbid (RBSC), f\u00e9mes szil\u00edciumr\u00e9szecsk\u00e9kkel infiltr\u00e1lva, sz\u00e9n- vagy grafit-el\u0151form\u00e1kba infiltr\u00e1lva, amelyek e folyamat sor\u00e1n nem zsugorodnak; \u00edgy nagyon pontos m\u00e9retekkel rendelkez\u0151 alkatr\u00e9szek hozhat\u00f3k l\u00e9tre.<\/p>\n
Az RBSC-vel val\u00f3 besziv\u00e1rg\u00e1st k\u00f6vet\u0151en magas h\u0151m\u00e9rs\u00e9kleten nitrid\u00e1l\u00e1snak vetik al\u00e1. Ez\u00e1ltal a f\u00e9mes szil\u00edcium SiC-nitridd\u00e9 alakul \u00e1t, \u00e9s a fennmarad\u00f3 p\u00f3rusokat szil\u00edciumkarbid h\u00e1l\u00f3zati anyaggal t\u00f6lti ki. Az XRD azt mutatja, hogy ez a forma gy\u00e9m\u00e1ntot, a-SiC-et, b-SiC-et, Si-t \u00e9s SiO2-t tartalmaz, m\u00edg a SEM grafitr\u00e9tegeket, valamint amorf szenet mutat.<\/p>\n
A jelen l\u00e9v\u0151 grafitr\u00e9teg miatt az RBSC alacsonyabb k-\u00e9rt\u00e9keket mutat, mint a szinterezett SiC, m\u00e9gis fel\u00fclm\u00falja az NSIC \u00e9rt\u00e9keit. Tov\u00e1bb\u00e1 jelent\u0151sen fel\u00fclm\u00falta a SiO2-alap\u00fa ker\u00e1mi\u00e1kat a korr\u00f3zi\u00f3\u00e1ll\u00f3s\u00e1g, a magas h\u0151m\u00e9rs\u00e9kletekkel szembeni ellen\u00e1ll\u00e1s, a termikus sokk\u00e1ll\u00f3s\u00e1g \u00e9s a termikus sokk elnyel\u0151k\u00e9pess\u00e9g tekintet\u00e9ben.<\/p>\n
A reakci\u00f3k\u00f6t\u00e9s\u0171 szil\u00edciumkarbid nagyszer\u0171 elektromos tulajdons\u00e1gokkal rendelkezik, p\u00e9ld\u00e1ul alacsony fajlagos ellen\u00e1ll\u00e1ssal \u00e9s magas h\u0151vezet\u0151 k\u00e9pess\u00e9ggel. Ezek a tulajdons\u00e1gok teszik kiv\u00e1l\u00f3 anyagv\u00e1laszt\u00e1ss\u00e1 az elektromos f\u0171t\u0151elemek sz\u00e1m\u00e1ra. Ezen t\u00falmen\u0151en k\u00e9miai inertit\u00e1sa \u00e9s oxid\u00e1ci\u00f3val szembeni ellen\u00e1ll\u00e1sa alkalmass\u00e1 teszi a kemenc\u00e9k h\u0151elemeinek, \u00e9g\u0151cs\u00facsainak, ellen\u0151rz\u0151 t\u00e9gl\u00e1inak \u00e9s muffinjainak gy\u00e1rt\u00e1s\u00e1ra; kiv\u00e1l\u00f3 h\u0151sokk-ellen\u00e1ll\u00f3s\u00e1ga pedig alkalmass\u00e1 teszi a kemenc\u00e9kben b\u00fatornak val\u00f3 felhaszn\u00e1l\u00e1sra.<\/p>\n
A reakci\u00f3k\u00f6t\u00e9s\u0171 SiC \u00fagy hozhat\u00f3 l\u00e9tre, hogy finomra osztott, intim szik \u00e9s sz\u00e9n kever\u00e9k\u00e9t l\u00e1gy\u00edt\u00f3val keverik, majd a l\u00e1gy\u00edt\u00f3t form\u00e1zz\u00e1k \u00e9s ki\u00e9getik, miel\u0151tt foly\u00e9kony vagy g\u00e1znem\u0171 szil\u00edciummal besziv\u00e1rogtatj\u00e1k. Ez a reakci\u00f3 lehet\u0151v\u00e9 teszi, hogy a szil\u00edcium a sz\u00e9nnel k\u00f6t\u0151dve t\u00f6bb szil\u00edciumkarbidot hozzon l\u00e9tre, amely azt\u00e1n az eredeti szil\u00edciumkarbiddal reag\u00e1lva a-SiC, b-SiC \u00e9s marad\u00e9k Si \u00f6sszet\u00e9tel\u0171 kompozitot k\u00e9pez.<\/p>\n
A besziv\u00e1rg\u00e1s idej\u00e9n azt \u00e1ll\u00edtj\u00e1k, hogy a reakci\u00f3 sor\u00e1n k\u00e9pz\u0151d\u00f6tt a-SiC szemcs\u00e9k \u00e9s b-SiC egyenletesen eloszlanak a por\u00f3zus el\u0151form\u00e1ban csom\u00f3sod\u00e1s n\u00e9lk\u00fcl, ami val\u00f3sz\u00edn\u0171leg annak tulajdon\u00edthat\u00f3, hogy a kapill\u00e1ris csatorn\u00e1kat nem z\u00e1rj\u00e1k el az \u00fajonnan k\u00e9pz\u0151d\u00f6tt b-SiC r\u00e9szecsk\u00e9k.<\/p>","protected":false},"excerpt":{"rendered":"
Reaction bonded silicon carbide (RBSC) is an exceptionally hard and strong ceramic material with superior mechanical strength, impact resistance, chemical […]<\/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":[5],"tags":[],"class_list":["post-36","post","type-post","status-publish","format-standard","hentry","category-product-related"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/posts\/36","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/comments?post=36"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/posts\/36\/revisions"}],"predecessor-version":[{"id":37,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/posts\/36\/revisions\/37"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/media?parent=36"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/categories?post=36"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/tags?post=36"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}