{"id":6656,"date":"2021-04-04T13:26:48","date_gmt":"2021-04-04T13:26:48","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6656"},"modified":"2021-08-04T17:57:08","modified_gmt":"2021-08-04T17:57:08","slug":"perbedaan-antara-korundum-sinter-dan-alumina-tabular","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/id\/perbedaan-antara-korundum-sinter-dan-alumina-tabular\/","title":{"rendered":"Perbedaan antara korundum sinter dan alumina tabular"},"content":{"rendered":"<p><strong>1. Alumina yang disinter<\/strong><\/p>\n<p>Alumina yang disinter juga disebut korundum yang disinter. Ini adalah klinker tahan api yang terbuat dari alumina yang dikalsinasi atau <a href=\"\/id\/produk\/bubuk-keramik-alumina\/\" target=\"_blank\" rel=\"noopener\">bubuk alumina industri<\/a> sebagai bahan baku, digiling halus menjadi bola atau benda hijau, dan disinter pada suhu tinggi 1750-1900 \u00b0 C. Alumina yang disinter dengan W (Al2O3) lebih dari 99% sebagian besar terbuat dari korundum berbutir halus seragam yang digabungkan secara langsung, porositas yang terlihat di bawah 3.0%, kerapatan curah mencapai 3.60 g \/ cm3, dan refraktori mendekati titik leleh korundum. Ini memiliki stabilitas volume dan stabilitas kimia yang baik, tidak mudah terkorosi dengan mengurangi atmosfer, kaca cair dan logam cair, dan memiliki kekuatan mekanik yang baik dan ketahanan aus pada suhu kamar dan suhu tinggi.<\/p>\n<p>Kepadatan massal dan ukuran kristal alumina yang disinter terkait erat dengan faktor-faktor seperti jenis bahan baku yang digunakan dalam proses sintering, metode pelet atau pembentukan, kepadatan awal tubuh, jenis dan jumlah aditif, dan suhu kalsinasi. Menambahkan kurang dari 1% (fraksi massa) TiO2 dapat mengurangi suhu sintering dan meningkatkan kepadatan alumina yang disinter; menambahkan lebih dari 2% hingga 3% (fraksi massa) TiO2 akan mengurangi densitasnya; efek lain dari penambahan TiO2 adalah untuk mendapatkan klinker partikel besar, alumina sinter yang mengkristal partikel besar memiliki ketahanan yang baik terhadap erosi terak. Dimungkinkan juga untuk menambahkan 1% hingga 2% (fraksi massa) H3BO3 untuk mendorong pertumbuhan butiran korundum. Tujuan lain dari penambahan H3BO3 adalah untuk bereaksi dengan Na2O dalam bahan baku untuk menghasilkan Na3BO3 dan menguap, mengurangi kandungan Na2O dalam bahan baku. Kadang-kadang untuk menghambat pertumbuhan kristal korundum yang tidak normal, sejumlah kecil MgO dapat ditambahkan.<\/p>\n<p>Kalsinasi alumina sinter sebagian besar dilakukan dalam tanur api terbalik atau tanur putar.<\/p>\n<p>Alumina sinter terutama digunakan sebagai bahan baku untuk produksi batu bata korundum sinter dan refraktori amorf, dan suhu yang dapat digunakan cukup tinggi.<\/p>\n<p>Namun demikian, bahan baku semacam ini menyebabkan pertumbuhan kristal apabila waktu pemanasan sekunder lama, dan akibatnya, batas larutan padat dapat diturunkan, dan endapan dihasilkan pada batas butir, yang memengaruhi performa suhu tinggi.<\/p>\n<p><strong>2. <a href=\"https:\/\/www.aluminaceramicball.com\/id\/penggunaan-korundum-tabular-yang-disinter-dalam-refraktori\/\">Alumina tabular<\/a><\/strong><\/p>\n<p><a href=\"\/id\/produk\/alumina-tabular\/\" target=\"_blank\" rel=\"noopener\">Alumina tabular<\/a>, juga dikenal sebagai <a href=\"https:\/\/www.aluminaceramicball.com\/id\/proses-produksi-tabular-korundum\/\">tabel korundum<\/a> di Cina, adalah alumina sinter murni yang telah dibakar tanpa aditif dan benar-benar menyusut.<\/p>\n<p>Alumina berbentuk piring terbuat dari bubuk alumina. Setelah digiling, dibentuk, dan dikeringkan, disinter dalam tanur bersuhu sangat tinggi pada suhu yang sedikit lebih rendah dari titik leleh korundum, dalam kondisi pemanasan dan pendinginan yang cepat, sehingga membentuk banyak ikatan yang erat. Kristal lempengan-kolom berukuran besar, dengan diameter rata-rata 40-200 mikron. Morfologi dua dimensi dari kristal adalah datar dan saling berselang-seling. Kristal mengandung banyak pori-pori tertutup melingkar berukuran 5-15 mikron, dengan lebih sedikit pori-pori terbuka. Umumnya 2% hingga 3%.<\/p>\n<p>Karena alumina lempengan tidak menambahkan aditif apa pun, ia memiliki kemurnian tinggi, titik leleh tinggi, kekerasan butiran kristal tinggi, kekuatan beban termal tinggi, penyusutan termal rendah, kepadatan tinggi, permeabilitas udara rendah, dan ketahanan aus yang baik, terutama karena ada banyak butiran kristal. Pori-pori kecil tertutup, dan stabilitas kejut termal baik. Kecuali asam fluorida dan asam fosfat, sebagian besar alkali dan asam anorganik tidak berpengaruh pada korundum tabular dan tahan terhadap serangan kimia.<\/p>\n<p>Karena serangkaian karakteristik alumina pelat, ini menjadi bahan baku tahan api yang ideal. Ini dapat digunakan sebagai agregat dalam bahan tahan api seperti A12O3-C, A12O3-SiO2-C dan Al2O3-Cr2O3, atau dapat ditambahkan ke refraktori lain dalam bahan tahan api tak berbentuk alumina tinggi. Refraktori monolitik alumina berbentuk pelat yang dikombinasikan dengan semen fosfat dan kalsium aluminat telah banyak digunakan. Bagian mana pun di mana korundum leburan atau korundum putih digunakan dapat diganti dengan alumina berbentuk pelat, sehingga kinerja bahan tahan api dapat ditingkatkan.<\/p>\n<p>Kalsinasi alumina berbentuk pelat sebagian besar dilakukan di dalam tanur poros bersuhu tinggi.<\/p>\n<p>Aplikasi plat alumina dalam industri besi dan baja hampir mencakup mulai dari tanur sembur, tanur sembur panas, tanur pencampur, tangki torpedo hingga konverter, tanur pemurnian sekunder, sendok, tundish, tanur perendaman, dan tanur pemanas untuk pengecoran mati dan pengecoran kontinu. Tunggu semua bagian yang menggunakan refraktori alumina.<\/p>\n<p>Dalam industri keramik, alumina berbentuk piring digunakan dalam furnitur kiln untuk meningkatkan kinerjanya secara signifikan. Misalnya, dapat meningkatkan stabilitas guncangan termal dan kemampuan anti-deformasi rol keramik; dapat digunakan untuk membuat saggers dan lempengan untuk keramik suhu tinggi seperti busi, <a href=\"https:\/\/www.aluminaceramicball.com\/id\/apa-saja-karakteristik-bola-alumina\/\">bola alumina<\/a>dll., dan masa pakainya telah ditingkatkan secara signifikan. Alumina berbentuk pelat juga dapat digunakan sebagai isolator, dan sebagai bahan baku pembuatan pembawa katalis untuk reaksi suhu tinggi yang membutuhkan porositas rendah, kekuatan tinggi, dan kemurnian tinggi.<\/p>\n<p>Meskipun mullite sinter dan spinel sinter juga merupakan klinker tahan api, keduanya merupakan bahan baku sintetis.<\/p>","protected":false},"excerpt":{"rendered":"<p>1.Sintered alumina Sintered alumina is also called sintered corundum. It is a refractory clinker made of calcined alumina or industrial alumina powder as raw material, finely ground into balls or green bodies, and sintered at a high temperature of 1750-1900\u00b0C. Sintered alumina with a W(Al2O3) over 99% is mostly made of uniform fine-grained corundum directly [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","site-sidebar-layout":"default","site-content-layout":"default","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":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","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":"","background-image":"","background-repeat":"repeat","background-position":"center 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