{"id":7847,"date":"2021-11-25T08:24:24","date_gmt":"2021-11-25T08:24:24","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=7847"},"modified":"2021-11-25T08:24:24","modified_gmt":"2021-11-25T08:24:24","slug":"degas-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/degas-molten-aluminum\/","title":{"rendered":"Aluminium Cair Karya Degas"},"content":{"rendered":"

Kemampuan untuk menghilangkan gas dari aluminium cair umumnya dicapai dengan menggunakan gas inert, yang biasanya dimasukkan ke dalam cairan logam melalui unit penghilang gas berputar. Proses penghilangan gas ini dibatasi oleh hukum-hukum termodinamika; ketika gelembung gas pembersih dimasukkan ke dalam cairan logam, gelembung-gelembung tersebut menyerap hidrogen saat mengapung ke permukaan. Skenario terbaik adalah gelembung-gelembung yang jenuh hidrogen ini meninggalkan cairan aluminium dan menurunkan kadar hidrogen. Dalam hal ini, efisiensi proses ini mencapai 100% dari sudut pandang termodinamika. Namun, seiring berkurangnya kandungan gas dalam cairan logam, tekanan kesetimbangan hidrogen dalam gelembung juga menurun, sehingga jumlah gas pembersih yang diperlukan untuk menghilangkan sisa hidrogen harus ditingkatkan.<\/p>\n

\"Aluminium<\/p>\n

Laju penghilangan gas pada kondisi kesetimbangan untuk aluminium murni di atas 1400F (760C). Laju penghilangan gas sebesar 200, misalnya, berarti dibutuhkan 200 liter gas inert untuk menghilangkan satu liter hidrogen. Perilaku ini membatasi kemampuan ahli metalurgi untuk melakukan degassing hingga tingkat hidrogen yang sangat rendah. Kelarutan juga meningkat secara eksponensial seiring kenaikan suhu, yang berarti bahwa kenaikan suhu sebesar 200\u00b0F (111\u00b0C) akan menggandakan kelarutan. Dengan semua faktor lain tetap sama, suhu aluminium cor yang lebih tinggi akan memperpanjang waktu degassing yang diperlukan.<\/p>\n

Unsur-unsur paduan juga dapat memengaruhi kelarutan hidrogen. Paduan dengan nilai yang lebih tinggi lebih sulit untuk dihilangkan gasnya; oleh karena itu, misalnya, aluminium 535 akan membutuhkan waktu empat kali lebih lama untuk dihilangkan gasnya dibandingkan aluminium murni. Untungnya, faktor-faktor ini dapat dikendalikan, dan kandungan gas serta proses yang diperlukan untuk menghilangkan porositas berlebih pada coran aluminium dapat dicapai tanpa kesulitan yang berlebihan dalam kebanyakan kasus.<\/p>\n

Bagaimana Cara Menghilangkan Gas dari Aluminium Cair?<\/strong><\/p>\n

Proses penghilangan gas biasanya dilakukan di salah satu dari tiga area di pabrik pengecoran logam:<\/p>\n

1. Di dalam wadah transfer, yang digunakan untuk mengangkut logam antara tungku peleburan dan tungku penampung.
\n2. Pada tungku cawan, biasanya tepat sebelum proses pengecoran aluminium cair.
\n3. Dalam sistem in-line, ketika logam dialirkan ke tungku penampungan melalui jalur pengangkutan.<\/p>\n

Dua opsi pertama adalah yang paling umum, dan proses penghilangan gas untuk keduanya biasanya dilakukan dengan menggunakan sebuah sistem penghilangan gas tipe rotari<\/a>. Secara konkret, tidak semua degasser rotari dirancang sama. Penting untuk memiliki desain kepala yang optimal guna menghasilkan gelembung-gelembung kecil yang sangat efisien. Penghematan biaya yang signifikan dapat dicapai melalui waktu proses yang lebih singkat dan pengurangan konsumsi gas. Di masa lalu, industri peleburan logam cenderung menggunakan desain kepala yang sederhana, yang memang lebih murah untuk diproduksi namun menghasilkan gelembung yang lebih besar. Pendekatan ini justru menimbulkan penghematan yang semu karena efisiensi yang berkurang.<\/p>","protected":false},"excerpt":{"rendered":"

The ability to degas molten aluminum is generally achieved by using an inert gas, typically introduced into the melt by a rotary degassing unit. This degassing process is limited by thermodynamic laws; when purge gas bubbles are introduced into the melt, they collect hydrogen as they float to the surface. The best possible situation is […]<\/p>\n","protected":false},"author":1,"featured_media":7848,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[24134,71],"class_list":["post-7847","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degas-molten-aluminum","tag-rotary-degassing-system"],"yoast_head":"\nDegas Molten Aluminum, Rotary Degassing System<\/title>\n<meta name=\"description\" content=\"The ability to degas molten aluminum is generally achieved by using an inert gas, typically introduced into melt by a rotary degassing unit.\" \/>\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\/degas-molten-aluminum\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" 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