{"id":5367,"date":"2021-01-29T02:40:14","date_gmt":"2021-01-29T02:40:14","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=5367"},"modified":"2022-02-25T01:55:22","modified_gmt":"2022-02-25T01:55:22","slug":"aluminum-casting-fluxes","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/aluminum-casting-fluxes\/","title":{"rendered":"Bahan Fluks untuk Pengecoran Aluminium"},"content":{"rendered":"

Flux pengecoran aluminium adalah zat padat (biasanya campuran klorida dan fluorida) yang digunakan di pabrik peleburan aluminium dan bengkel pengecoran. Tujuannya adalah untuk mengurangi oksidasi logam cair, mengurangi penetrasi hidrogen dari atmosfer, menyerap inklusi non-logam yang tersuspensi dalam logam cair, menjaga agar dinding tungku\/wadah tetap bersih dari endapan oksida yang menumpuk, serta mengurangi kandungan aluminium yang tersisa dalam endapan, menghilangkan hidrogen terlarut dalam logam cair, menghaluskan butiran aluminium selama proses pemadatan, memodifikasi inklusi silikon dalam paduan yang mengandung silikon, serta mengoksidasi kelebihan magnesium. Setiap jenis fluks pengecoran aluminium memiliki fungsi yang berbeda-beda.<\/p>\n

\"Bahan<\/p>\n

Bahan Fluks untuk Pengecoran Aluminium<\/h2>\n

A fluks pemurnian<\/a> yang terdiri dari garam-garam yang mengandung klorin dan fluorin digunakan untuk menghilangkan gas dari paduan aluminium cair. Komponen-komponen agen pemurnian tersebut bereaksi dengan aluminium untuk membentuk senyawa gas (klorida aluminium, fluorida aluminium). Gas tersebut membentuk gelembung dan naik ke permukaan logam cair. Tekanan parsial hidrogen dalam gelembung yang terbentuk sangat rendah, sehingga hidrogen berdifusi dari aluminium cair ke dalam gelembung. Gelembung-gelembung tersebut keluar dari logam cair dan kemudian melewati sistem pembuangan untuk menghilangkan gas. Proses ini berlanjut hingga gelembung-gelembung berhenti terbentuk. Fluks yang telah dihilangkan gasnya juga dapat dimasukkan melalui injeksi. Dalam hal ini, gas inert berfungsi sebagai pembawa untuk fluks granular. Selain efek penghilangan gas, perlakuan penghilangan gas ini juga dapat menghilangkan inklusi non-logam yang tersuspensi dalam cairan logam.<\/p>\n

Yang fluks penghilang terak<\/a> mendorong pemisahan aluminium cair yang terperangkap dalam terak. Selain klorida dan fluorida, bahan pelebur juga mengandung komponen pengoksidasi, yang bereaksi secara eksotermik dengan aluminium saat dipanaskan. Panas yang dihasilkan oleh bahan pelebur meningkatkan kemampuan basah dan kelancaran aliran aluminium yang terperangkap, sehingga tetesan-tetesan aluminium tersebut menyatu dan mengalir ke dalam cairan logam. Slag yang diolah oleh alat penghilang slag berbentuk bubuk dan kering. Slag ini mudah dikeluarkan dari tungku. Fluks membantu mengurangi kehilangan aluminium, sehingga sangat efektif secara ekonomi, terutama dalam proses peleburan ulang serutan aluminium.<\/p>\n

\"Flux<\/p>\n

Titik leleh dari aliran penutup<\/a> lebih rendah daripada aluminium. Fluks penutup diaplikasikan pada permukaan aluminium cair untuk meleleh dan membentuk lapisan yang terus-menerus di permukaan aluminium cair guna melindungi logam cair tersebut dari oksidasi dan penyerapan hidrogen atmosfer. Flux penutup terdiri dari campuran NaCl dan KCl, dan mungkin juga mengandung beberapa aditif seperti CaCl\u2082, CaF\u2082, atau KF. Fluorida semakin menurunkan titik leleh flux dan meningkatkan kemampuan pembersihannya. Kelemahan dari flux yang mengandung fluorida adalah flux tersebut melepaskan asap berbahaya pada suhu kerja. Flux lapisan pelindung bebas natrium digunakan untuk melelehkan paduan aluminium-silikon hipereutektik. Paduan hipereutektik dimodifikasi dengan fosfor, dan penambahan fosfor menyebabkan pemurnian kristal silikon primer. Natrium akan mengurangi efek pemurnian fosfor pada paduan semacam itu.<\/p>\n

Yang pembersih fluks<\/a> menghilangkan oksida yang tersuspensi dalam cairan logam. Sama seperti fluks, pembersih ini terdiri dari campuran klorida, fluorida, dan zat pengoksidasi. Pembersih ini menghasilkan panas yang lebih sedikit, sehingga efek pemisahannya terhadap aluminium pun lebih rendah. Namun, pembersih ini memiliki kemampuan yang lebih baik dalam menyerap inklusi oksida dalam cairan logam.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminum casting fluxes are solid substances (usually a mixture of chloride and fluoride) used in aluminum smelter and foundries. The purpose is to reduce the oxidation of the melt, reduce the penetration of hydrogen in the atmosphere, absorb the non-metallic inclusions suspended in the melt, keep the furnace\/ladle clear of the walls of the […]<\/p>\n","protected":false},"author":1,"featured_media":5368,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[85],"tags":[],"class_list":["post-5367","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"yoast_head":"\nAluminum Casting Fluxes -sales@aluminiumceramicfiber.com<\/title>\n<meta name=\"description\" content=\"The aluminum casting fluxes are solid substances (usually a mixture of chloride and fluoride) used in aluminum smelter and foundries.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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