{"id":6534,"date":"2021-07-16T03:46:38","date_gmt":"2021-07-16T03:46:38","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=6534"},"modified":"2021-07-16T03:46:38","modified_gmt":"2021-07-16T03:46:38","slug":"flux-composition","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/flux-composition\/","title":{"rendered":"Komposisi Fluks"},"content":{"rendered":"

Komposisi kimia fluks pengecoran aluminium sebagian besar terdiri dari garam halogen, yang merupakan inklusi heterogen dibandingkan dengan cairan aluminium. Setelah proses pemurnian cairan aluminium selesai, cairan tersebut harus didiamkan selama beberapa waktu agar inklusi tersebut mengapung atau mengendap, lalu dipisahkan dari cairan aluminium.<\/p>\n

\"Komposisi<\/p>\n

Dengan mengambil Na\u2083AlF\u2086 dan Na\u2082SiF\u2086 sebagai contoh, Na\u2083AlF\u2086 menimbulkan reaksi-reaksi berikut dalam lelehan aluminium:
\n2Al\u2082O\u2083 + 2Na\u2083AlF\u2086 = 3Na\u2082O\u00b7Al\u2082O\u2083 + 4AlF\u2083<\/p>\n

Na\u2083AlF\u2086 memiliki titik leleh yang relatif tinggi dan higroskopisitas yang rendah. Produk dekomposisinya mengurangi kemampuan basah pada antarmuka antara alumina padat dan aluminium cair, sehingga memudahkan pemisahan dari aluminium dan mempercepat pengeringan terak. Namun, kandungan fluorida yang terlalu tinggi akan menyebabkan reaksi eksotermik yang hebat dan menghasilkan gas beracun dalam jumlah besar. Na\u2083AlF\u2086 dapat menyerap dan melarutkan Al\u2082O\u2083, serta dapat meningkatkan tegangan permukaan saat bersentuhan dengan aluminium cair dan mempercepat pemisahannya dari aluminium cair.<\/p>\n

AlF\u2083 yang dihasilkan dari reaksi tersebut dapat menghilangkan unsur-unsur alkali tanah seperti Ca dan Na dalam lelehan aluminium (rumus reaksinya adalah sebagai berikut).
\nAlF\u2083 + 3Na = Al + 3NaF
\n2AlF\u2083 + 3Ca = 2Al + 3CaF\u2082<\/p>\n

Reaksi dekomposisi Na\u2082SiF\u2086 dalam lelehan aluminium adalah sebagai berikut:
\nNa\u2082SiF\u2086 \u2192 SiF\u2084 + 2NaF<\/p>\n

NaF yang dihasilkan oleh reaksi tersebut dapat menyebabkan korosi pada badan logam di antarmuka Al\u2082O\u2083-Al, melepaskan lapisan oksida secara mekanis, dan melarutkannya ke dalam fluks, sehingga memurnikannya, serta melepaskan sejumlah kecil Na yang menyebabkan degradasi. SiF\u2084 yang dihasilkan menguap menjadi gas dan sebagian dihilangkan.<\/p>\n

Na\u2082SiF\u2086 dan Al\u2082O\u2083 mengalami reaksi-reaksi berikut:
\n3Na\u2082SiF\u2086 + 2Al\u2082O\u2083 = 2Na\u2083AlF\u2086 + 3SiO\u2082 + AlF\u2083<\/p>\n

Na\u2083AlF\u2086 yang dihasilkan memiliki kemampuan untuk mengadsorpsi Al\u2082O\u2083, dan juga dapat digabungkan dengan SiO\u2082 untuk membentuk terak padat yang mudah dikupas.<\/p>\n

Seiring kemajuan teknologi pengolahan paduan aluminium dan perkembangan fluks paduan aluminium<\/a> Dalam teknologi pemurnian, telah muncul beberapa karakteristik baru dalam persiapan fluks dan persyaratan kinerjanya, yang tidak hanya menuntut standar yang lebih tinggi terhadap efektivitas pemurnian, tetapi juga menuntut standar yang lebih tinggi terhadap fluks itu sendiri.<\/p>\n

Saat ini, proses pemurnian aluminium cair menuntut standar pemurnian yang semakin tinggi, dan komposisi bahan pelebur yang kompleks meningkatkan risiko terjadinya polusi sekunder pada aluminium cair dan lingkungan akibat bahan pelebur itu sendiri. Komposisi bahan pelebur harus dibuat sesederhana mungkin; hal inilah satu-satunya cara untuk mengatasi efek samping yang ditimbulkan oleh bahan pelebur tersebut.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminum casting flux chemical composition is mostly halogen salts, which are heterogeneous inclusions relative to the aluminum melt. After the melt purification is completed, it must be allowed to stand for a period of time to float or settle, and then separate from the aluminum liquid. Taking Na3AlF6 and Na2SiF6 as examples, Na3AlF6 produces […]<\/p>\n","protected":false},"author":1,"featured_media":6535,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-6534","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFlux Composition, Aluminum Casting Flux for Foundry<\/title>\n<meta name=\"description\" content=\"The aluminum casting flux chemical composition is mostly halogen salts, which are heterogeneous inclusions relative to the aluminum melt.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/flux-composition\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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