kaolin<\/a> ve al\u00fcmina tozu kullan\u0131lmakta olup, mullit malzemeler sinterleme veya elektrof\u00fczyon y\u00f6ntemiyle haz\u0131rlanmaktad\u0131r. K\u00f6m\u00fcr gang\u0131ndaki kaolinit i\u00e7eri\u011fi genel olarak %90’\u0131n \u00fczerine \u00e7\u0131kabildi\u011finden, gang\u0131 Al2O3 gibi yard\u0131mc\u0131 malzemelerle kar\u0131\u015ft\u0131rarak ve y\u00fcksek s\u0131cakl\u0131kta kalsinasyon yaparak m\u00fckemmel performansa sahip mullit ve mullit kompozit malzemeler haz\u0131rlanabilir. \u00fclkem de k\u00f6m\u00fcr gang\u0131ndan mullit ve kompozit malzemelerinin haz\u0131rlanmas\u0131nda baz\u0131 ilerlemeler kaydetti.<\/p>\nM\u00fcllit klinker haz\u0131rlamak i\u00e7in ana hammadde olarak y\u00fcksek al\u00fcmina boksit, k\u00f6m\u00fcr gang ve az miktarda Al2O3 ile birlikte kullan\u0131lan ara\u015ft\u0131rma, m\u00fckemmel performansa sahip mullit klinkerin 1700 \u00b0C’de pi\u015firilebilece\u011fini ve g\u00f6r\u00fcn\u00fcr g\u00f6zeneklili\u011finin 1700 \u00b0C’den daha az oldu\u011funu buldu. %25, k\u00fctle yo\u011funlu\u011fu \u2265 2,75g\/cm3.<\/p>\n
Ana hammadde olarak, al\u00fcmina ile e\u015fit olarak kar\u0131\u015ft\u0131r\u0131lan asitlenmi\u015f k\u00f6m\u00fcr gang kullan\u0131lm\u0131\u015f ve kat\u0131 hal sinterleme ile mullit haz\u0131rlanm\u0131\u015ft\u0131r. \u00d6nce artacak ve sonra biraz azalacakt\u0131r, bu nedenle mulliti haz\u0131rlamak i\u00e7in bekletme s\u00fcresi 2 saat i\u00e7inde kontrol edilmelidir.<\/p>\n
Ana hammadde olarak boksit ve k\u00f6m\u00fcr gang, katk\u0131 maddesi olarak vanadyum pentoksit (V2O5) ve al\u00fcminyum flor\u00fcr (AlF3) kullan\u0131larak, kat\u0131 hal reaksiyonu ile ana kristal faz\u0131 mullit faz\u0131 olan bir kristal haz\u0131rland\u0131. Ara\u015ft\u0131rma g\u00f6steriyor ki: al\u00fcminyum K\u00f6m\u00fcr gang\u0131ndaki boksit ve silikon-al\u00fcmina 2:3.05 molar oran\u0131nda kar\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda, haz\u0131rlanan mullit malzemesinin mukavemeti ve sertli\u011fi \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirildi ve performans en iyisi oldu. Hacim yo\u011funlu\u011fu 2,3 g\/cm3 kadar y\u00fcksek, g\u00f6r\u00fcn\u00fcr g\u00f6zeneklilik %23,6, su emme oran\u0131 %10,55 ve b\u00fck\u00fclme mukavemeti 114MPa’d\u0131r.<\/p>\n
Hammadde olarak k\u00f6m\u00fcr gang ve kaolen kullan\u0131larak ve potasyum feldspat ilave edilerek mullit-y\u00fcksek silika cam kompozit malzeme ba\u015far\u0131yla sentezlendi. \u00c7al\u0131\u015fmada, kar\u0131\u015f\u0131m\u0131n potasyum feldspat eklenmeden sinterleme s\u0131cakl\u0131\u011f\u0131n\u0131n 1590\u00b0C’nin \u00fczerinde oldu\u011fu, K2O oran\u0131 %1,5 olan ve potasyum feldspat eklenmi\u015f kar\u0131\u015f\u0131m\u0131n sinterleme s\u0131cakl\u0131\u011f\u0131n\u0131n 1530\u00b0C’ye d\u00fc\u015f\u00fcr\u00fclebildi\u011fi tespit edilmi\u015ftir. Bu nedenle kar\u0131\u015f\u0131ma belirli miktarda potasyum feldispat eklenmesi sinterleme s\u0131cakl\u0131\u011f\u0131n\u0131 d\u00fc\u015f\u00fcrebilir.<\/p>\n
K\u00f6m\u00fcr gang\u0131n\u0131 hammadde olarak kullanarak gang, safs\u0131zl\u0131k giderme, kalsinasyon ve di\u011fer i\u015flemlerle aktive edilir ve nano-mullite kompozit toz malzeme hidrotermal kristalizasyon ile haz\u0131rlan\u0131r. Sonu\u00e7lar, nano-mullite kompozit faz\u0131n, 2-4 mol\/L sodyum hidroksit \u00e7\u00f6zeltisi konsantrasyonu, 80-90\u00b0C kar\u0131\u015ft\u0131rma s\u0131cakl\u0131\u011f\u0131, 3 saat \u0131s\u0131 koruma ko\u015fullar\u0131 alt\u0131nda aktif k\u00f6m\u00fcr gang tozundan haz\u0131rland\u0131\u011f\u0131n\u0131 g\u00f6stermektedir. ve 10mL\/g s\u0131v\u0131-kat\u0131 oran\u0131. Toz, nano-mullit kompozit tozu, \u00e7o\u011fu s\u00fctun kristalleri olan iyi bir kristalle\u015fme etkisine sahiptir, tane uzunlu\u011fu 50nm’dir ve ortalama en boy oran\u0131 3.5’e ula\u015f\u0131r.<\/p>\n
2. Yo\u011fun sialon ve kompozit malzemeleri<\/p>\n
Hammadde olarak y\u00fcksek al\u00fcmina k\u00f6m\u00fcr gang, demir konsantresi tozu ve kok tozu kullan\u0131larak Fe-Sialon kompozit yo\u011fun malzeme karbotermal indirgeme nitr\u00fcrleme y\u00f6ntemi ile 1400-1550\u00b0C’de 4 saat s\u00fcreyle haz\u0131rland\u0131. Kok i\u00e7eri\u011finin %10’u a\u015ft\u0131\u011f\u0131 bulundu 1. 1500\u00b0C’de 4 saat haz\u0131rlanan Fe-Sialon yo\u011fun malzeme, en d\u00fczg\u00fcn tane da\u011f\u0131l\u0131m\u0131na ve en iyi performansa sahiptir.<\/p>\n
Ana hammadde olarak k\u00f6m\u00fcr gang ve do\u011fal kil kullan\u0131larak, ye\u015fil g\u00f6vdeyi \u015fekillendirmek i\u00e7in kolloidal kal\u0131plama i\u015flemi kullan\u0131lm\u0131\u015f ve karbotermal indirgeme nitr\u00fcrleme i\u015flemi ile \u03b2-Sialon\/SiC kompozit yo\u011fun seramik malzeme ba\u015far\u0131yla sentezlenmi\u015ftir. \u00c7al\u0131\u015fma, optimize edilmi\u015f koloidal kal\u0131plama i\u015fleminin, 1,12 g\/cm3 kadar y\u00fcksek yo\u011funlu\u011fa sahip ham bir g\u00f6vde \u00fcretmek i\u00e7in kullan\u0131labilece\u011fini ve sinterlemeden sonra yo\u011fun bir \u03b2-Sialon\/SiC kompozit malzemenin \u00fcretilebilece\u011fini buldu.<\/p>\n","protected":false},"excerpt":{"rendered":"
Yap\u0131lan ara\u015ft\u0131rmalar sonucunda k\u00f6m\u00fcr gang\u0131n\u0131n ana bile\u015fenlerinin al\u00fcmina ve silis oldu\u011fu ve bu bile\u015fiklerin seramik \u00fcretiminde yayg\u0131n olarak kullan\u0131lan hammaddeler oldu\u011fu tespit edilmi\u015ftir.<\/p>\n","protected":false},"author":7,"featured_media":125373,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[851],"tags":[],"class_list":["post-125478","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-endustri-haberleri-tr"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/posts\/125478","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/comments?post=125478"}],"version-history":[{"count":0,"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/posts\/125478\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/media\/125373"}],"wp:attachment":[{"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/media?parent=125478"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/categories?post=125478"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.alpapowder.com\/tr\/wp-json\/wp\/v2\/tags?post=125478"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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