{"id":716,"date":"2026-10-11T21:20:22","date_gmt":"2026-10-11T13:20:22","guid":{"rendered":"https:\/\/siliconcarbide.net\/?p=716"},"modified":"2026-10-11T21:20:22","modified_gmt":"2026-10-11T13:20:22","slug":"nitrurle-baglanmis-silikon-karbur-neden-8-ila-12-ay-sonra-mukavemetini-kaybeder","status":"publish","type":"post","link":"https:\/\/siliconcarbide.net\/tr\/why-nitride-bonded-silicon-carbide-lose-strength-after-8-12-months\/","title":{"rendered":"Nitr\u00fcr Ba\u011fl\u0131 Silikon Karb\u00fcr Neden 8\u201312 Ay Sonra Mukavemetini Kaybeder?"},"content":{"rendered":"

Nitr\u00fcr Ba\u011fl\u0131 Silikon Karb\u00fcr, Oksitleyici Ortamlarda 8\u201312 Ay Sonra Neden Mukavemet Kaybeder?<\/strong><\/h1>\n

\u015eanghay ve \u00e7evresindeki seramik ve metalurji tesislerinde y\u00fcksek s\u0131cakl\u0131kl\u0131 ekipmanlarla u\u011fra\u015farak on iki y\u0131l\u0131m\u0131 ge\u00e7irdim. Nitr\u00fcr ba\u011fl\u0131 silikon karb\u00fcrde kar\u015f\u0131la\u015ft\u0131\u011f\u0131m en s\u0131k g\u00f6r\u00fclen sorunlardan biri, f\u0131r\u0131n raflar\u0131n\u0131n, plakalar\u0131n\u0131n ve ayarlay\u0131c\u0131lar\u0131n f\u0131r\u0131na girdiklerinde sa\u011flam g\u00f6r\u00fcnmelerine ra\u011fmen, birka\u00e7 ayl\u0131k normal kullan\u0131m\u0131n ard\u0131ndan daha \u00f6nce sorunsuz bir \u015fekilde ta\u015f\u0131d\u0131klar\u0131 y\u00fckler alt\u0131nda \u00e7atlamaya veya sarkmaya ba\u015flamalar\u0131d\u0131r. \u00c7o\u011fu operat\u00f6r, malzemenin basit\u00e7e \u201ca\u015f\u0131nd\u0131\u011f\u0131n\u0131\u201d veya pi\u015firme d\u00f6ng\u00fcs\u00fcn\u00fcn \u00e7ok agresif oldu\u011funu varsayar. \u00c7al\u0131\u015ft\u0131\u011f\u0131m hatlarda as\u0131l neden, y\u00fczey s\u0131cakl\u0131kta havaya maruz kald\u0131\u011f\u0131nda nitr\u00fcr ba\u011f faz\u0131n\u0131n kademeli olarak oksitlenmesidir.<\/p>\n

Nitr\u00fcr ba\u011fl\u0131 silikon karb\u00fcr, silikon karb\u00fcr tanelerini bir arada tutmak ve par\u00e7aya mukavemet ile termal \u015fok direnci kazand\u0131rmak i\u00e7in silikon nitr\u00fcr matrisine dayan\u0131r. \u0130ndirgenici veya n\u00f6tr bir atmosferde bu ba\u011f nispeten kararl\u0131 kal\u0131r. F\u0131r\u0131n veya ocak fazla hava ile \u00e7al\u0131\u015ft\u0131\u011f\u0131nda \u2014 ki bu durum aral\u0131kl\u0131 seramik pi\u015firmelerinde veya belirli metal \u0131s\u0131l i\u015flem d\u00f6ng\u00fclerinde yayg\u0131nd\u0131r \u2014 oksijen nitride sald\u0131r\u0131r. Y\u00fczeyde ve daha da \u00f6nemlisi tane s\u0131n\u0131rlar\u0131nda silika bak\u0131m\u0131ndan zengin ince bir tabaka olu\u015fur. Par\u00e7a aniden bozulmaz; e\u011filme mukavemetini kademeli olarak kaybeder ve termal gradyanlara kar\u015f\u0131 daha duyarl\u0131 hale gelir. Yeni iken 40 MPa'n\u0131n olduk\u00e7a \u00fczerinde \u00f6l\u00e7\u00fclen plakalar\u0131n, 1200 \u00b0C ile oda s\u0131cakl\u0131\u011f\u0131 aras\u0131nda 8\u201312 ay boyunca g\u00fcnl\u00fck d\u00f6ng\u00fcye maruz kald\u0131ktan sonra 20'li d\u00fc\u015f\u00fck de\u011ferlere d\u00fc\u015ft\u00fc\u011f\u00fcn\u00fc s\u0131k s\u0131k g\u00f6r\u00fcyorum.<\/p>\n

Bunun pratikteki sonucu iki \u015fekilde ortaya \u00e7\u0131kar. Birincisi, raflarda kenarlardan veya destek noktalar\u0131n\u0131n \u00e7evresinden ba\u015flayan ve daha sonra kendi a\u011f\u0131rl\u0131klar\u0131 ile \u00fczerinde bulunan \u00fcr\u00fcn y\u00fck\u00fcn\u00fcn etkisiyle yay\u0131lan ince \u00e7atlaklar olu\u015fur. \u0130kincisi, g\u00f6r\u00fcn\u00fcr \u00e7atlaklar ortaya \u00e7\u0131kmadan \u00f6nce bile etkin y\u00fck ta\u015f\u0131ma kapasitesi d\u00fc\u015fer; bu nedenle operat\u00f6rler ya raf ba\u015f\u0131na \u00fcr\u00fcn say\u0131s\u0131n\u0131 azalt\u0131r ya da daha y\u00fcksek k\u0131r\u0131lma oranlar\u0131n\u0131 kabul eder. Her iki durumda da tesis, mobilyalar\u0131 orijinal sat\u0131n alma hesaplamas\u0131nda \u00f6ng\u00f6r\u00fclenden daha erken bir zamanda de\u011fi\u015ftirmek zorunda kal\u0131r. Daha s\u0131k\u0131 atmosfer kontrol\u00fcne sahip s\u00fcrekli iticili veya makaral\u0131 f\u0131r\u0131nlar kullanan tesisler genellikle ayn\u0131 kalitedeki mobilyalardan daha uzun \u00f6m\u00fcr elde eder; \u015eanghay b\u00f6lgesinde yayg\u0131n olan aral\u0131kl\u0131 kesimli f\u0131r\u0131nlarda ise her so\u011fuma i\u015flemi s\u0131ras\u0131nda taze havan\u0131n s\u0131cak y\u00fczeylere ula\u015fmas\u0131 nedeniyle sorun daha h\u0131zl\u0131 ortaya \u00e7\u0131kar.<\/p>\n

Ba\u011flanma a\u015famas\u0131n\u0131 s\u0131n\u0131rlay\u0131c\u0131 fakt\u00f6r olarak ele ald\u0131\u011f\u0131n\u0131zda, bozulmay\u0131 asl\u0131nda neyin yava\u015flatt\u0131\u011f\u0131 olduk\u00e7a a\u00e7\u0131kt\u0131r. Tepe s\u0131cakl\u0131\u011f\u0131n\u0131 ve bu s\u0131cakl\u0131kta kalma s\u00fcresini, i\u015flemin izin verdi\u011fi \u00f6l\u00e7\u00fcde m\u00fcmk\u00fcn oldu\u011funca d\u00fc\u015f\u00fck tutun; 1350 \u00b0C\u2019nin \u00fczerindeki her 50 \u00b0C\u2019lik art\u0131\u015f, geri gelen par\u00e7alarda \u00f6l\u00e7t\u00fc\u011f\u00fcm oksidasyon h\u0131z\u0131n\u0131 belirgin \u015fekilde h\u0131zland\u0131rmaktad\u0131r. F\u0131r\u0131n tasar\u0131m\u0131 izin verdi\u011fi durumlarda, y\u00fcksek s\u0131cakl\u0131kta bekletme s\u0131ras\u0131nda k\u0131sa s\u00fcreli bir tahliye veya hafif indirgeyici bir atmosfer, oksijen k\u0131smi bas\u0131nc\u0131n\u0131 kullanma \u00f6mr\u00fcn\u00fc birka\u00e7 ay uzatacak kadar azalt\u0131r. Ayn\u0131 derecede \u00f6nemli olan bir di\u011fer fakt\u00f6r de mekanik y\u00fcklemedir. Yaln\u0131zca u\u00e7lar\u0131ndan desteklenen ve a\u011f\u0131r, dengesiz y\u00fck ta\u015f\u0131yan nitr\u00fcrle ba\u011flanm\u0131\u015f SiC, alt y\u00fczeyinde daha y\u00fcksek \u00e7ekme gerilmeleri olu\u015fturur; y\u00fczey oksidasyon nedeniyle zay\u0131flad\u0131\u011f\u0131nda bu gerilmeler \u00e7atlaklar\u0131n daha erken olu\u015fmas\u0131na neden olur. \u00dc\u00e7 noktal\u0131 veya s\u00fcrekli deste\u011fe ge\u00e7mek ya da basit\u00e7e plaka ba\u015f\u0131na maksimum y\u00fck\u00fc \u201320 oran\u0131nda azaltmak, genellikle malzeme kalitesini de\u011fi\u015ftirmeden orijinal de\u011fi\u015ftirme aral\u0131\u011f\u0131n\u0131 geri kazand\u0131r\u0131r.<\/p>\n

Ayr\u0131ca iade edilen plakalarda oksitlenmi\u015f tabakan\u0131n kal\u0131nl\u0131\u011f\u0131n\u0131 da kontrol ediyorum. Birka\u00e7 y\u00fcz mikron kal\u0131nl\u0131\u011f\u0131nda, d\u00fczg\u00fcn ve a\u00e7\u0131k gri bir y\u00fczey tabakas\u0131 normaldir; kenarlarda yer yer daha kal\u0131n bir tabaka veya tozlanma g\u00f6r\u00fclmesi genellikle f\u0131r\u0131nda bir s\u0131cak nokta oldu\u011funu ya da \u00f6nerilen s\u0131n\u0131r\u0131n \u00fczerinde uzun s\u00fcre maruz kal\u0131nd\u0131\u011f\u0131n\u0131 g\u00f6sterir. Atmosfer \u00f6l\u00e7\u00fcmlerini, maksimum raf y\u00fck\u00fcn\u00fc ve ilk \u00e7atlaklar\u0131n ortaya \u00e7\u0131kmas\u0131ndan \u00f6nceki d\u00f6ng\u00fc say\u0131s\u0131n\u0131 kaydeden tesisler, genellikle ayn\u0131 nitr\u00fcr ba\u011flanm\u0131\u015f SiC plakalar\u0131n ortalama \u00f6mr\u00fcn\u00fc yakla\u015f\u0131k 10 aydan 14\u201316 aya \u00e7\u0131karabilir. Orijinal yo\u011fun y\u00fckleme d\u00fczenini ve tam hava atmosferini kullanmaya devam eden tesisler ise, plakalar\u0131 daha k\u0131sa ve daha pahal\u0131 bir programla de\u011fi\u015ftirir ve yeni setin neden bir \u00f6ncekinden daha uzun \u00f6m\u00fcrl\u00fc olmad\u0131\u011f\u0131n\u0131 merak etmeye devam ederler.<\/p>\n

Ba\u011flanma a\u015famas\u0131 korundu\u011funda, malzemenin kendisi uzun \u00f6m\u00fcrl\u00fc olabilir. Sahada g\u00f6zlemledi\u011fim fark, neredeyse hi\u00e7bir zaman hammadde kalitesinde ani bir de\u011fi\u015fiklikten kaynaklanmaz; as\u0131l mesele, tesisin oksidasyon ve y\u00fcklemeyi kontrol edilebilir de\u011fi\u015fkenler olarak m\u0131, yoksa ka\u00e7\u0131n\u0131lmaz arka plan ko\u015fullar\u0131 olarak m\u0131 ele ald\u0131\u011f\u0131d\u0131r.<\/p>","protected":false},"excerpt":{"rendered":"

Why Nitride Bonded Silicon Carbide Lose Strength After 8\u201312 Months in Oxidizing Atmospheres I\u2019ve spent twelve years dealing with high-temperature equipment around Shanghai and the surrounding ceramics and metallurgy plants. One of the most consistent problems I see with nitride bonded silicon carbide is that the kiln shelves, plates, and setters look solid when they… <\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[30],"tags":[],"class_list":["post-716","post","type-post","status-publish","format-standard","hentry","category-sic-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/posts\/716","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/comments?post=716"}],"version-history":[{"count":1,"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/posts\/716\/revisions"}],"predecessor-version":[{"id":717,"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/posts\/716\/revisions\/717"}],"wp:attachment":[{"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/media?parent=716"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/categories?post=716"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/siliconcarbide.net\/tr\/wp-json\/wp\/v2\/tags?post=716"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}