A szil\u00edciumkarbid kiv\u00e9teles magas h\u0151m\u00e9rs\u00e9kleti szil\u00e1rds\u00e1ga \u00e9s oxid\u00e1ci\u00f3val szembeni ellen\u00e1ll\u00e1sa miatt p\u00f3tolhatatlan szerkezeti ker\u00e1miaanyag, amely n\u00e9lk\u00fcl\u00f6zhetetlenn\u00e9 teszi a mechanikai gy\u00e1rt\u00e1s, a rep\u00fcl\u0151g\u00e9p- \u00e9s \u0171rtechnol\u00f3gia \u00e9s az inform\u00e1ci\u00f3s elektronika ter\u00fclet\u00e9n.<\/p>\n
A reakci\u00f3szinterez\u00e9s alacsony h\u0151m\u00e9rs\u00e9kletet \u00e9s r\u00f6vid szinterel\u00e9si id\u0151t k\u00edn\u00e1l, mik\u00f6zben k\u00f6zel nett\u00f3 m\u00e9ret\u0171 alakzatokat \u00e1ll\u00edt el\u0151, de korl\u00e1tozza az egyenetlen s\u0171r\u0171s\u00e9geloszl\u00e1s, a szinterelt term\u00e9kek repedez\u00e9se \u00e9s a szinterel\u00e9si folyamatok sor\u00e1n a szil\u00edcium el\u00e9gtelen behatol\u00e1sa.<\/p>\n
A szil\u00edciumkarbid egy rendk\u00edv\u00fcl kem\u00e9ny \u00e9s sz\u00edv\u00f3s ker\u00e1miaanyag, amely kiv\u00e1l\u00f3 magas h\u0151m\u00e9rs\u00e9kleti szil\u00e1rds\u00e1g\u00e1r\u00f3l, kop\u00e1s\u00e1ll\u00f3s\u00e1g\u00e1r\u00f3l \u00e9s k\u00e9miai oxid\u00e1ci\u00f3val szembeni ellen\u00e1ll\u00f3 k\u00e9pess\u00e9g\u00e9r\u0151l ismert. E tulajdons\u00e1gainak k\u00f6sz\u00f6nhet\u0151en a szil\u00edciumkarbidot sz\u00e1mos ipari alkalmaz\u00e1sban haszn\u00e1lj\u00e1k, t\u00f6bbek k\u00f6z\u00f6tt atomer\u0151m\u0171vekben, kemenc\u00e9kben, sug\u00e1rhajt\u00f3m\u0171vekben, rak\u00e9taf\u00fav\u00f3k\u00e1kban \u00e9s a pap\u00edrgy\u00e1rt\u00e1sban.<\/p>\n
A szinterezett szil\u00edciumkarbid magas h\u0151m\u00e9rs\u00e9klet\u0171 mechanikai tulajdons\u00e1gainak jav\u00edt\u00e1s\u00e1nak egyik m\u00f3dja a k\u00fasz\u00e1s\u00e1ll\u00f3s\u00e1got fokoz\u00f3 adal\u00e9kanyagok, p\u00e9ld\u00e1ul alum\u00ednium, b\u00f3r \u00e9s sz\u00e9n (SiC-ABC) hozz\u00e1ad\u00e1sa. Ezek az adal\u00e9kok megv\u00e1ltoztatj\u00e1k a szemcsehat\u00e1r energi\u00e1kat \u00e9s a fel\u00fcleti energi\u00e1kat, mik\u00f6zben n\u00f6velik a t\u00e9rfogati diff\u00fazi\u00f3s sebess\u00e9get \u00e9s g\u00e1tolj\u00e1k az \u00fcvegk\u00e9pz\u0151d\u00e9st a szemcsehat\u00e1rokon.<\/p>\n
A mechanikai tulajdons\u00e1gok n\u00f6vel\u00e9s\u00e9nek egy m\u00e1sik m\u00f3dja a nyom\u00e1s n\u00e9lk\u00fcli szinterez\u00e9s, amely a SiC por t\u00f6m\u00f6r anyagainak k\u00fcls\u0151 nyom\u00e1s alkalmaz\u00e1sa n\u00e9lk\u00fcli szinterez\u00e9s\u00e9t jelenti. Ennek a m\u00f3dszernek az el\u0151nye abban rejlik, hogy kik\u00fcsz\u00f6b\u00f6li a hagyom\u00e1nyos forr\u00f3 sajtol\u00e1sos szinterel\u00e9si m\u00f3dszerek \u00e1ltal okozott s\u0171r\u0171s\u00e9gingadoz\u00e1sokat, amelyek jelent\u0151s m\u00e9retv\u00e1ltoz\u00e1sokat \u00e9s a term\u00e9kmin\u0151s\u00e9g roml\u00e1s\u00e1t eredm\u00e9nyezik - emellett minden eddigin\u00e9l k\u00f6zelebbi s\u0171r\u0171s\u00e9geket hoz l\u00e9tre az elm\u00e9leti \u00e9rt\u00e9kekhez.<\/p>\n
A szil\u00edciumkarbid kiv\u00e1l\u00f3 k\u00e9miai korr\u00f3zi\u00f3\u00e1ll\u00f3s\u00e1got mutat a k\u00f6rnyezetek sz\u00e9les sk\u00e1l\u00e1j\u00e1n 1700 \u00b0C-ig, p\u00e9ld\u00e1ul sz\u00e1raz oxig\u00e9n, forr\u00f3 g\u00e1zg\u0151z\u00f6k, foly\u00e9kony s\u00f3k \u00e9s f\u00e9mek, valamint olvadt s\u00f3k \u00e9s sz\u00e9nhamu salakok ellen.<\/p>\n
A szinterezett szil\u00edciumkarbid szerkezet\u00e9nek \u00e9s fel\u00fcleti min\u0151s\u00e9g\u00e9nek k\u00f6sz\u00f6nhet\u0151en kiv\u00e1l\u00f3 korr\u00f3zi\u00f3\u00e1ll\u00f3s\u00e1got biztos\u00edt. Ez az anyag er\u0151s ellen\u00e1ll\u00e1ssal b\u00fcszk\u00e9lkedhet az er\u00f3zi\u00f3val (cs\u00fasz\u00e1ssal), mechanikai szil\u00e1rds\u00e1ggal, h\u0151hat\u00e1ssal \u00e9s kop\u00e1ssal szemben.<\/p>\n
A magas h\u0151m\u00e9rs\u00e9kleten szinterezett XICAR szil\u00edciumkarbid anyag (k\u00f6zismert nev\u00e9n Hexoloy SE alternat\u00edva) savas k\u00f6rnyezetben, p\u00e9ld\u00e1ul t\u00f6m\u00e9ny HCl-ben \u00e9s HNO3-ban rendk\u00edv\u00fcl ellen\u00e1ll\u00f3nak bizonyult a k\u00e9miai korr\u00f3zi\u00f3val szemben, \u00e9s az Y2O3-mal kezelt mint\u00e1k nagyobb ellen\u00e1ll\u00e1st mutattak, mint az MgO szinterez\u00e9si seg\u00e9danyaggal kezeltek.<\/p>\n
A reakci\u00f3k\u00f6t\u00e9s\u0171 szinterezett szil\u00edciumkarbidot, amelyet \u00e1ltal\u00e1ban \u00f6nk\u00f6t\u0151 szil\u00edciumkarbidnak neveznek, \u00fagy \u00e1ll\u00edtj\u00e1k el\u0151, hogy egy sz\u00e9ntartalm\u00fa por\u00f3zus ker\u00e1mia testet foly\u00e9kony szil\u00edciummal reag\u00e1ltatnak. Ez a kever\u00e9k besziv\u00e1rog a ker\u00e1miatestbe, grafittal reakci\u00f3ba l\u00e9pve b-SiC-t k\u00e9pez, majd a megl\u00e9v\u0151 a-SiC-r\u00e9szecsk\u00e9kkel egyes\u00fclve teljes s\u0171r\u0171s\u00e9g\u0171, reakci\u00f3szinterezett szil\u00edciumkarbidot k\u00e9pez, amelynek k\u00fcl\u00f6nb\u00f6z\u0151 form\u00e1i \u00e1llnak rendelkez\u00e9sre ezen elj\u00e1r\u00e1s r\u00e9v\u00e9n.<\/p>\n
A szil\u00edciumkarbid az egyik leger\u0151sebb ker\u00e1miaanyag. A szil\u00edciumkarbid kiv\u00e1l\u00f3 magas h\u0151m\u00e9rs\u00e9kleti szil\u00e1rds\u00e1ggal \u00e9s oxid\u00e1ci\u00f3val szembeni ellen\u00e1ll\u00e1ssal b\u00fcszk\u00e9lkedhet, ez\u00e9rt sz\u00e1mos ipari alkalmaz\u00e1sban kiv\u00e1l\u00f3 anyagv\u00e1laszt\u00e1s.<\/p>\n
A szil\u00edcium-karbid ker\u00e1mi\u00e1k jellemz\u0151en nyom\u00e1s n\u00e9lk\u00fcli szinterez\u00e9ssel vagy reakci\u00f3k\u00f6t\u00e9ssel k\u00e9sz\u00fclnek, \u00e9s a Saint-Gobain Performance Ceramics & Refractories mindk\u00e9t t\u00edpust k\u00edn\u00e1lja a k\u00fcl\u00f6nb\u00f6z\u0151 v\u00e9gfelhaszn\u00e1l\u00e1si alkalmaz\u00e1sokhoz.<\/p>\n
A nyom\u00e1s n\u00e9lk\u00fcl szinterezett szil\u00edciumkarbidot finom szemcs\u00e9s SiC por \u00e9s nem oxid szinterel\u00e9si seg\u00e9danyagok kombin\u00e1l\u00e1s\u00e1val \u00e1ll\u00edtj\u00e1k el\u0151, \u00e9s 2000degC-n\u00e9l magasabb h\u0151m\u00e9rs\u00e9kleten, inert atmoszf\u00e9r\u00e1ban szinterezik, nagy s\u0171r\u0171s\u00e9g\u0171, kiv\u00e1l\u00f3 oxid\u00e1ci\u00f3s ellen\u00e1ll\u00e1ssal, korr\u00f3zi\u00f3\u00e1ll\u00f3s\u00e1ggal \u00e9s mechanikai tulajdons\u00e1gokkal rendelkez\u0151 anyagot el\u0151\u00e1ll\u00edtva.<\/p>\n
A reakci\u00f3szinterez\u00e9s a szil\u00edciumkarbid (SiC) ker\u00e1mi\u00e1k el\u0151\u00e1ll\u00edt\u00e1s\u00e1nak \u00fajonnan megjelen\u0151 elj\u00e1r\u00e1sa, amely olyan el\u0151ny\u00f6ket k\u00edn\u00e1l, mint a s\u0171r\u0171 szerkezet, az alacsonyabb feldolgoz\u00e1si h\u0151m\u00e9rs\u00e9klet, az alak\u00edthat\u00f3s\u00e1g, az alacsony k\u00f6lts\u00e9g \u00e9s a nagyobb tisztas\u00e1g. Sajnos azonban a hajl\u00edt\u00f3szil\u00e1rds\u00e1g j\u00f3val elmarad a standard szinterezett SiC-t\u0151l a mikroszerkezetben l\u00e9v\u0151 marad\u00e9k sz\u00e9n (Si) m\u00e9rete miatt.<\/p>\n
A szinterezett szil\u00edcium-karbid ker\u00e1mia a legkem\u00e9nyebb \u00e9s leger\u0151sebb ker\u00e1miaanyagok k\u00f6z\u00e9 tartozik, mik\u00f6zben rendk\u00edv\u00fcl magas h\u0151m\u00e9rs\u00e9kleten is er\u0151s marad - \u00edgy kiv\u00e1l\u00f3 v\u00e1laszt\u00e1s olyan alkalmaz\u00e1sokhoz, ahol a magas h\u0151m\u00e9rs\u00e9kletnek val\u00f3 ellen\u00e1ll\u00e1s kulcsfontoss\u00e1g\u00fa.<\/p>\n
Az SSIC sz\u00e9les h\u0151m\u00e9rs\u00e9klet-tartom\u00e1nyban szinte \u00e1lland\u00f3 szil\u00e1rds\u00e1got mutat, \u00e9s m\u00e9g nagy nyom\u00e1s alatt is meg\u0151rzi sz\u00edv\u00f3ss\u00e1g\u00e1t, \u00edgy rendk\u00edv\u00fcl n\u00e9pszer\u0171 anyagv\u00e1laszt\u00e1s a nagy teljes\u00edtm\u00e9ny\u0171 szivatty\u00faalkatr\u00e9szek \u00e9s m\u00e1s alapvet\u0151 fontoss\u00e1g\u00fa berendez\u00e9sek alkatr\u00e9szei sz\u00e1m\u00e1ra.<\/p>\n
Az SSIC-eket hagyom\u00e1nyos ker\u00e1miaform\u00e1z\u00e1si technik\u00e1kkal \u00e1ll\u00edtj\u00e1k el\u0151. A k\u00edv\u00e1nt form\u00e1ra alak\u00edt\u00e1s ut\u00e1n az SSIC-eket magas h\u0151m\u00e9rs\u00e9kleten \u00e9s nyom\u00e1son, inert g\u00e1z atmoszf\u00e9r\u00e1ban szinterezik.<\/p>\n
A szinterez\u00e9s k\u00e9t k\u00fcl\u00f6nb\u00f6z\u0151 f\u00e1zisra oszthat\u00f3, a szil\u00e1rd f\u00e1zis\u00fa \u00e9s a folyad\u00e9kf\u00e1zis\u00fa szinterez\u00e9sre. A szil\u00e1rd f\u00e1zis\u00fa szinterez\u00e9shez C \u00e9s B szinterez\u00e9si seg\u00e9danyagk\u00e9nt t\u00f6rt\u00e9n\u0151 hozz\u00e1ad\u00e1sa sz\u00fcks\u00e9ges a SiC-ker\u00e1mi\u00e1k szemcsehat\u00e1r-energi\u00e1j\u00e1nak cs\u00f6kkent\u00e9se \u00e9rdek\u00e9ben, m\u00edg a foly\u00e9kony f\u00e1zis egy vagy t\u00f6bb elem eutektikus oxidjait (p\u00e9ld\u00e1ul Y2O3) haszn\u00e1lja seg\u00e9danyagk\u00e9nt, amely elektrolitikus f\u00e1zist hoz l\u00e9tre a szil\u00edcium-dioxid-r\u00e9szecsk\u00e9k k\u00f6z\u00f6tti mozg\u00e1ssal, diff\u00fazi\u00f3val \u00e9s t\u00f6meg\u00e1tvitellel az anyags\u0171r\u0171s\u00e9g s\u0171r\u00edt\u00e9se \u00e9rdek\u00e9ben.<\/p>","protected":false},"excerpt":{"rendered":"
Silicon carbide is an irreplaceable structural ceramic material due to its exceptional high temperature strength and oxidation resistance, making it […]<\/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-72","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\/72","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=72"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/posts\/72\/revisions"}],"predecessor-version":[{"id":73,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/posts\/72\/revisions\/73"}],"wp:attachment":[{"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/media?parent=72"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/categories?post=72"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbideceramic.net\/hu\/wp-json\/wp\/v2\/tags?post=72"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}