{"id":6284,"date":"2021-06-23T10:05:56","date_gmt":"2021-06-23T10:05:56","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=6284"},"modified":"2021-06-23T10:05:56","modified_gmt":"2021-06-23T10:05:56","slug":"sound-metal","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/sound-metal\/","title":{"rendered":"Logam Berkualitas"},"content":{"rendered":"

Istilah \"logam murni\" digunakan untuk merujuk pada kualitas logam cair tepat sebelum proses pengecoran, yang berarti penghilangan hidrogen terlarut dan pengotor non-logam dari logam cair tersebut.<\/p>\n

Ketika logam mengeras, kelarutan hidrogen dalam paduan aluminium menurun sekitar satu orde besar. Oleh karena itu, jika kandungan hidrogen pada logam cair tidak turun di bawah batas kelarutan hidrogen dalam logam padat, hidrogen akan terlepas dari logam selama proses pengecoran. Hidrogen dapat menyebabkan lubang kecil pada logam yang membeku dengan cepat (seperti ingot yang didinginkan secara langsung) atau mengisi rongga penyusutan pada logam yang membeku secara perlahan. Hidrogen yang tersisa dalam logam bahkan setelah pemadatan tetap berbahaya karena hidrogen tersebut berdifusi ke dalam rongga dan diskontinuitas lain pada logam padat selama proses perlakuan panas, sehingga memperburuk dampak merugikan dari cacat-cacat ini terhadap sifat-sifat logam. Kelebihan hidrogen dapat menyebabkan serpihan mengkilap pada hasil tempa dan gelembung pada produk canai.<\/p>\n

\"Logam<\/p>\n

Aluminium cair sebelum dituang mengandung banyak pengotor. Jika pengotor-pengotor ini tidak dihilangkan, akan terjadi pemborosan bahan dalam jumlah besar selama proses penuangan, atau kualitas logam dari produk yang dihasilkan akan buruk. Pada paduan berbasis aluminium cair, pengotor berbahaya utama adalah hidrogen terlarut dan partikel non-logam tersuspensi, seperti oksida aluminium dan magnesium, partikel refraktori, dll. Karena aluminium merupakan logam yang sangat mudah teroksidasi, oksida aluminium terbentuk selama proses peleburan aluminium dalam aluminium cair. Ketika jumlah alumina yang dihasilkan meningkat, tingkat pemulihan aluminium akan menurun. Selain itu, cat dan inklusi lainnya biasanya terkandung dalam blok aluminium dan ditambahkan ke dalam aluminium cair. Seiring meningkatnya jumlah inklusi tersebut, kemurnian aluminium pun menurun.<\/p>\n

Agar diperoleh logam yang berkualitas baik dan mengatasi masalah yang disebabkan oleh alumina dan inklusi tersebut, aluminium cair diolah dengan bahan pelebur yang dapat mencegah aluminium teroksidasi serta menahan inklusi-inklusi tersebut.<\/p>\n

Dulu, pengurangan kandungan gas terlarut dan kandungan pengotor non-logam pada logam cair dilakukan dengan menjaga suhu di dalam tungku dan wadah pengolahan logam lainnya serendah mungkin, serta mempertahankan logam dalam keadaan cair selama waktu yang lama. Namun, praktik yang memakan waktu ini telah dimodifikasi dan sebagian besar digantikan oleh berbagai metode fluks, di mana logam cair bersentuhan dengan gas reaktif atau fluks padat yang biasanya mengandung halogen. Fluks yang paling umum digunakan dalam pengolahan aluminium adalah klorin atau senyawa penghasil klorin, seperti heksakloroetana. Pada sebagian besar jenis paduan, laju aliran klorin<\/a> dapat menghilangkan hidrogen dan pengotor nonlogam secara memuaskan.<\/p>","protected":false},"excerpt":{"rendered":"

Sound metal is used to refer to the quality of the molten metal immediately before casting, which means the removal of dissolved hydrogen and non-metallic impurities from the molten metal. When the metal solidifies, the solubility of hydrogen in the aluminum alloy decreases by about an order of magnitude. Therefore, if the hydrogen content of […]<\/p>\n","protected":false},"author":1,"featured_media":6286,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-6284","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nSound Metal - Quality of Molten Metal, Impurities Removal<\/title>\n<meta name=\"description\" content=\"Sound metal is used to refer to the quality of the molten metal immediately before casting, which means the impurities removal.\" \/>\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\/sound-metal\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sound Metal - 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