{"id":3466,"date":"2020-10-22T02:41:26","date_gmt":"2020-10-22T02:41:26","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=3466"},"modified":"2020-10-22T02:41:26","modified_gmt":"2020-10-22T02:41:26","slug":"degassing-refining-of-molten-metal","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/degassing-refining-of-molten-metal\/","title":{"rendered":"Penghilangan Gas dan Pemurnian Logam Cair"},"content":{"rendered":"

Dalam proses pemanasan dan peleburan paduan aluminium, baik logam dalam bentuk padat maupun cair memiliki kemampuan untuk menyerap H\u2082, O\u2082, N\u2082, dan gas-gas lainnya. Sifat logam ini disebut gettering, yang merupakan salah satu karakteristik peleburan logam yang penting. Praktik menunjukkan bahwa gas yang terdapat dalam logam dalam keadaan adsorpsi, pelarutan, dan penggabungan memiliki dampak negatif terhadap sifat logam dan paduan serta kualitas ingot. Hidrogen yang terlarut dalam paduan merupakan penyebab utama porositas, gelembung, dan delaminasi pada ingot, bahkan dapat menyebabkan kerapuhan akibat hidrogen. Kandungan oksigen, nitrogen, dan senyawa-senyawa keduanya dalam bahan akan merusak sifat proses dan sifat mekanis bahan tersebut. Oleh karena itu, tugas utama lain dalam proses peleburan adalah menghilangkan gas yang terlarut dalam logam cair. Memahami dan menguasai sumber gas, proses pelarutan gas dalam logam, faktor-faktor yang memengaruhi kandungan gas dalam logam, serta penghilangan gas dan pemurnian<\/a> Prinsip dan metode pengolahan logam cair merupakan kunci untuk mengurangi penyerapan gas dan proses penghilangan gas pada logam. Hal ini sangat penting untuk meningkatkan kualitas aluminium cair dan menghasilkan ingot yang memenuhi standar.<\/p>\n

\"Penghilangan<\/p>\n

Ada tiga bentuk gas dalam ingot: larutan padat, senyawa, dan pori. Sebagian besar gas larut dalam kisi logam dalam bentuk atom, sehingga membentuk larutan padat. Gas yang melebihi batas kelarutan serta gas yang tidak larut akan teradsorpsi pada terak padat sebagai molekul gas atau terdapat dalam bentuk pori. Jika afinitas kimia antara gas dan unsur tertentu dalam logam lebih besar daripada afinitas antara atom-atom gas, gas tersebut dapat membentuk senyawa dengan unsur tersebut, seperti Al\u2082O\u2083, MgO, dan inklusi terak lainnya.<\/p>\n

Dalam proses peleburan, senyawa yang paling berbahaya adalah uap air, yang bereaksi dengan logam sehingga menghasilkan hidrogen dan oksigen yang mudah diserap oleh logam.<\/p>\n

Hasil penelitian menunjukkan bahwa gas yang terlarut dalam logam cair mudah membentuk pori-pori saat ingot mengeras. Berdasarkan analisis, gas utama dalam pori-pori tersebut adalah hidrogen; oleh karena itu, yang disebut \u201cpenyerapan logam\u201d pada dasarnya mengacu pada penyerapan hidrogen. Kandungan gas dalam logam juga dapat dianggap secara kasar sebagai kandungan hidrogen. Oleh karena itu, proses penghilangan gas pada logam cair terutama mengacu pada penghilangan hidrogen dari logam cair tersebut.<\/p>","protected":false},"excerpt":{"rendered":"

In the process of heating and melting aluminum alloy, both solid and liquid metals have the ability to absorb H2, O2, N2 and other gases. This property of metal is called gettering, which is one of the important melting characteristics of metals. Practice shows that the gas existing in metal in the state of adsorption, […]<\/p>\n","protected":false},"author":1,"featured_media":3467,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3466","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing Refining of Molten Metal | Hydrogen Removal<\/title>\n<meta name=\"description\" content=\"Degassing refining of molten metal mainly refers to the removal of hydrogen from the melt. 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