{"id":701,"date":"2026-11-07T11:48:10","date_gmt":"2026-11-07T03:48:10","guid":{"rendered":"https:\/\/ceramicatijolart.com\/?p=701"},"modified":"2026-11-07T11:48:10","modified_gmt":"2026-11-07T03:48:10","slug":"kapec-nitrida-saistitais-silicija-karbids-plaisa-cikliskajas-krasnis","status":"publish","type":"post","link":"https:\/\/ceramicatijolart.com\/lv\/why-nitride-bonded-silicon-carbide-cracks-in-cyclic-kilns\/","title":{"rendered":"K\u0101p\u0113c nitr\u012bda saist\u012btais sil\u012bcija karb\u012bds plais\u0101 ciklisk\u0101s kr\u0101sn\u012bs"},"content":{"rendered":"

K\u0101p\u0113c nitr\u012bda saist\u012btais sil\u012bcija karb\u012bds plais\u0101 ciklisk\u0101s kr\u0101sn\u012bs, pat ja t\u0101 iztur\u012bbas r\u0101d\u012bt\u0101ji \u0161\u0137iet augsti<\/strong><\/h1>\n

Esmu divpadsmit gadus str\u0101d\u0101jis ar sil\u012bcija nitr\u012bda saist\u012btu sil\u012bcija karb\u012bdu kr\u0101sns apr\u012bkojum\u0101 un augsttemperat\u016bras ier\u012bc\u0113s, un visbie\u017e\u0101k nov\u0113rot\u0101s boj\u0101jumu c\u0113lo\u0146i nav saist\u012bti ar vienk\u0101r\u0161u p\u0101rslodzi. T\u0101s rodas no atk\u0101rtotiem termiskajiem cikliem, kas izraisa oksid\u0101cijas boj\u0101jumus nitr\u012bda saites f\u0101z\u0113. S\u0101kotn\u0113ji materi\u0101lam ir laba iztur\u012bba istabas temperat\u016br\u0101 un pietiekama iztur\u012bba pret termiskajiem triecieniem, ta\u010du, kad tas gais\u0101 tiek pak\u013cauts pietiekami daudziem uzsild\u012b\u0161anas un atdzes\u0113\u0161anas cikliem, sil\u012bcija nitr\u012bds, kas saista kop\u0101 sil\u012bcija karb\u012bda graudi\u0146us, s\u0101k oksid\u0113ties. \u0160\u012b oksid\u0101cija izraisa apjoma palielin\u0101\u0161anos un mikroplaisu veido\u0161anos, kas galu gal\u0101 savienojas.<\/p>\n

Nitr\u012bda saist\u012btajam sil\u012bcija karb\u012bdam parasti piem\u012bt sil\u012bcija nitr\u012bda t\u012bkls, kas veidojas nitrid\u0113\u0161anas apdedzin\u0101\u0161anas laik\u0101. \u0160\u012b saite nodro\u0161ina materi\u0101lam augst\u0101ku iztur\u012bbu un lab\u0101ku termisk\u0101 \u0161oka iztur\u012bbu nek\u0101 daudziem m\u0101la vai oks\u012bda saist\u012btajiem sil\u012bcija karb\u012bda veidiem. Ierobe\u017eojums par\u0101d\u0101s, ja temperat\u016bra oksid\u0113jo\u0161\u0101 atmosf\u0113r\u0101 regul\u0101ri p\u0101rsniedz apm\u0113ram 1400 \u00b0C. Sil\u012bcija nitr\u012bds oksid\u0113jas, p\u0101rv\u0113r\u0161oties par sil\u012bcija dioks\u012bdu, un ar to saist\u012bt\u0101 izple\u0161an\u0101s rada spriedzi strukt\u016br\u0101. Nep\u0101rtrauktas darb\u012bbas apst\u0101k\u013cos augst\u0101 temperat\u016br\u0101 boj\u0101jumi uzkr\u0101jas l\u0113n\u0101m. Kr\u0101sn\u012bs, kuras darbojas katru dienu vai vair\u0101kas reizes ned\u0113\u013c\u0101, tie par\u0101d\u0101s daudz \u0101tr\u0101k.<\/p>\n

Laboratorijas dati no oksid\u0101cijas un ciklisko slod\u017eu testiem<\/strong><\/p>\n

M\u0113s veic\u0101m standarta nitr\u012bda saist\u012bta sil\u012bcija karb\u012bda markas stie\u0146u kombin\u0113tu oksid\u0101cijas un termisk\u0101 cikla testu. Paraugus 50 stundas tur\u0113ja 1450 \u00b0C temperat\u016br\u0101 gais\u0101, p\u0113c tam desmit reizes pak\u013c\u0101va ciklam starp 1450 \u00b0C un 200 \u00b0C. Lieces iztur\u012bba istabas temperat\u016br\u0101 s\u0101kotn\u0113ji bija aptuveni 180\u2013200 MPa. P\u0113c piln\u012bgas iedarb\u012bbas t\u0101 bija samazin\u0101jusies l\u012bdz 110\u2013130 MPa. Svara pieaugums vid\u0113ji bija 1,5\u20132,0 %, un \u0161\u0137\u0113rsgriezumos bija redzams 100\u2013150 \u00b5m biezs sil\u012bcija dioks\u012bda bag\u0101ts sl\u0101nis ar smalk\u0101m plais\u0101m, kas stiep\u0101s no virsmas uz nitr\u012bda saites zon\u0101m. Paral\u0113lais paraugs, kas tika tur\u0113ts taj\u0101 pa\u0161\u0101 temperat\u016br\u0101, bet bez atdzes\u0113\u0161anas cikliem, zaud\u0113ja maz\u0101k iztur\u012bbas \u2014 apm\u0113ram 20 % viet\u0101 35\u201340 %. Cikliski p\u0101rbaud\u012bjumi ac\u012bmredzami pa\u0101trin\u0101ja boj\u0101jumu veido\u0161anos, tikl\u012bdz bija s\u0101kusies oksid\u0101cija.<\/p>\n

Praktisks piem\u0113rs no keramikas kr\u0101sns<\/strong><\/p>\n

Santehnikas r\u016bpn\u012bca izmantoja nitr\u012bda saist\u012btas sil\u012bcija karb\u012bda sijas un balstus \u0161\u016bpu\u013ckr\u0101sn\u012b, kur\u0101 apdedzin\u0101\u0161ana notika 1420\u20131440 \u00b0C temperat\u016br\u0101. Ra\u017eo\u0161anas grafika d\u0113\u013c kr\u0101sni starp liel\u0101ko da\u013cu kravu atdzes\u0113ja gandr\u012bz l\u012bdz apk\u0101rt\u0113j\u0101s vides temperat\u016brai. Apm\u0113ram p\u0113c asto\u0146iem m\u0113ne\u0161iem vair\u0101k\u0101s sij\u0101s par\u0101d\u012bj\u0101s gareniskas plaisas, un t\u0101s bija j\u0101nomaina. Identiskas sijas nep\u0101rtrauktas darb\u012bbas tunelkr\u0101sn\u012b ar t\u0101du pa\u0161u maksim\u0101lo temperat\u016bru joproj\u0101m bija ekspluat\u0101cij\u0101 p\u0113c vair\u0101k nek\u0101 diviem gadiem. M\u0113s izgriez\u0101m pl\u012bsu\u0161o siju no \u0161\u016bpu\u013ckr\u0101sns un atkl\u0101j\u0101m to pa\u0161u oksid\u0113to saites f\u0101zi un virsmas plais\u0101\u0161anu, ko bij\u0101m nov\u0113roju\u0161i laboratorij\u0101. Maksim\u0101l\u0101 temperat\u016bra un atmosf\u0113ra bija sal\u012bdzin\u0101mas; at\u0161\u0137ir\u012bba bija pilnu termisko ciklu skait\u0101. Tikl\u012bdz r\u016bpn\u012bca samazin\u0101ja atdzi\u0161anu ned\u0113\u013cas nogal\u0113s un uztur\u0113ja kr\u0101sni virs aptuveni 300 \u00b0C starp ra\u017eo\u0161anas cikliem, jaunas sijas no t\u0101 pa\u0161a nitr\u012bda saist\u012bt\u0101 sil\u012bcija karb\u012bda veida kalpoja iev\u0113rojami ilg\u0101k. Materi\u0101ls nebija main\u012bjies \u2014 bija main\u012bjies darba cikls.<\/p>\n

Kas paties\u012bb\u0101 ierobe\u017eo kalpo\u0161anas laiku<\/strong><\/p>\n

Sil\u012bcija nitr\u012bda saites oksid\u0113\u0161an\u0101s ir galvenais kalpo\u0161anas laika ierobe\u017eot\u0101js gaisa vid\u0113, ja temperat\u016bra ilgsto\u0161i p\u0101rsniedz apm\u0113ram 1400 \u00b0C. Termiskie cikli situ\u0101ciju v\u0113l vair\u0101k pasliktina, jo izple\u0161an\u0101s un sarau\u0161an\u0101s atver ce\u013cu liel\u0101kam sk\u0101bek\u013ca daudzumam un p\u0101rv\u0113r\u0161 nelielas oksid\u0113t\u0101s zonas par plais\u0101m. Reduc\u0113jo\u0161\u0101 vid\u0113 oksid\u0113\u0161an\u0101s \u0101trums strauji samazin\u0101s un kalpo\u0161anas ilgums parasti ir ilg\u0101ks, t\u0101p\u0113c \u0161is pats materi\u0101la veids noteiktos metalur\u0123ijas pielietojumos bie\u017ei vien uzr\u0101da lab\u0101kus rezult\u0101tus nek\u0101 keramikas kr\u0101sn\u012bs, kuras tiek kurin\u0101tas gais\u0101.<\/p>\n

Noz\u012bme ir ar\u012b sienas biezumam un tam, cik strauji main\u0101s temperat\u016bra. Biez\u0101k\u0101s sekcij\u0101s straujas atdzi\u0161anas laik\u0101 veidojas liel\u0101ki termiskie gradienti, kas papildus oksid\u0101cijas rad\u012btajiem boj\u0101jumiem rada ar\u012b meh\u0101nisku slodzi. Da\u017eos ra\u017eo\u0161anas procesos pie\u0146em \u012bs\u0101ku kalpo\u0161anas laiku apmai\u0146\u0101 pret augst\u0101ku karstuma iztur\u012bbu un siltumvad\u012btsp\u0113ju, ko nodro\u0161ina nitr\u012bda saites sil\u012bcija karb\u012bds sal\u012bdzin\u0101jum\u0101 ar oks\u012bda saites alternat\u012bv\u0101m. Citi maina materi\u0101la marku vai p\u0101rk\u0101rto apdedzin\u0101\u0161anas grafiku, tikl\u012bdz plais\u0101\u0161ana k\u013c\u016bst bie\u017ea.<\/p>\n

Ja nitr\u012bda saist\u012bti sil\u012bcija karb\u012bda kr\u0101sns piederumi vai apr\u012bkojums s\u0101k plais\u0101t krietni pirms tam, kad to var\u0113tu izskaidrot ar abraz\u012bvo nodilumu vai vienk\u0101r\u0161u p\u0101rslodzi, parasti j\u0101piev\u0113r\u0161 uzman\u012bba maksim\u0101l\u0101s temperat\u016bras, oksid\u0113jo\u0161as vides un termisko ciklu skaita kombin\u0101cijai. S\u0101kotn\u0113jie iztur\u012bbas r\u0101d\u012bt\u0101ji ir re\u0101li, ta\u010du tie nemain\u0101s, kad nitr\u012bda saite s\u0101k oksid\u0113ties atk\u0101rtotas kars\u0113\u0161anas un atdzes\u0113\u0161anas rezult\u0101t\u0101.<\/p>","protected":false},"excerpt":{"rendered":"

Why Nitride Bonded Silicon Carbide Cracks in Cyclic Kilns Even When Strength Numbers Look High I\u2019ve spent twelve years working with silicon nitride bonded silicon carbide in kiln furniture and high-temperature fixtures, and the failures that show up most often aren\u2019t from simple overload. They come from repeated thermal cycling that opens up oxidation damage […]<\/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":"default","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":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","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-701","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/posts\/701","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/comments?post=701"}],"version-history":[{"count":1,"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/posts\/701\/revisions"}],"predecessor-version":[{"id":702,"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/posts\/701\/revisions\/702"}],"wp:attachment":[{"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/media?parent=701"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/categories?post=701"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ceramicatijolart.com\/lv\/wp-json\/wp\/v2\/tags?post=701"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}