{"id":4272,"date":"2020-11-13T01:25:35","date_gmt":"2020-11-13T01:25:35","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=4272"},"modified":"2020-11-13T01:25:35","modified_gmt":"2020-11-13T01:25:35","slug":"refining-of-cast-aluminum","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/refining-of-cast-aluminum\/","title":{"rendered":"Pemurnian Aluminium Cor"},"content":{"rendered":"

Proses pemurnian paduan aluminium cor melibatkan penambahan senyawa kimia ke dalam aluminium cair untuk menghilangkan gas dan terak.<\/p>\n

Pemurnian merupakan tahap proses penting yang tidak boleh dilewatkan dalam proses pengecoran paduan aluminium. Tahap ini berfungsi untuk menghilangkan gas, memurnikan, dan memurnikan paduan aluminium. Selain itu, tahap ini juga dapat meningkatkan plastisitas dan ketangguhan paduan aluminium hasil cor serta mempersiapkannya untuk perlakuan pengerasan presipitasi.<\/p>\n

Paduan aluminium cor memiliki sifat kimia yang relatif aktif. Selama proses pengecoran dan peleburan, paduan ini mudah bereaksi dengan uap air sehingga mengalami oksidasi dan menyerap hidrogen, sehingga terbentuk cacat seperti inklusi dan lubang jarum saat cairan aluminium mengeras menjadi coran aluminium.<\/p>\n

\"Pemurnian<\/p>\n

Yang proses pemurnian<\/a> Proses pengecoran paduan aluminium dapat sepenuhnya melarutkan berbagai fase dalam paduan, memperkuat struktur kristal yang telah disempurnakan, serta meningkatkan ketangguhan dan ketahanan terhadap korosi, menghilangkan tegangan, dan melunakkan material, sehingga memungkinkan dilakukannya proses pengolahan atau pembentukan lebih lanjut.<\/p>\n

Selain uap yang dihasilkan dari paduan aluminium cor selama proses peleburan, uap juga akan terbentuk saat dituang ke dalam cetakan. Logam cair yang masuk ke dalam cetakan mengalami penurunan suhu, sehingga kelarutan gas pun berkurang, dan gas berlebih mengendap, sebagian di antaranya tidak dapat keluar. Gas tersebut tetap berada di dalam coran aluminium dan membentuk pori-pori, yang umumnya disebut \u201clubang jarum\u201d.<\/p>\n

Gas dalam paduan aluminium cor terkadang bercampur dengan rongga penyusutan, dan gas yang mengendap dalam cairan aluminium tetap berada di dalam rongga penyusutan tersebut. Jika tekanan yang dihasilkan oleh pemanasan gelembung tersebut besar, permukaan pori-pori akan halus dan terdapat lapisan yang mengkilap di sekitar lubang-lubang tersebut; jika tekanan yang dihasilkan oleh gelembung tersebut kecil, permukaan bagian dalam pori-pori akan berkerut, yang tampak seperti \u201ckaki lalat\u201d, dan jika diamati lebih dekat, akan terlihat adanya lubang-lubang penyusutan.<\/p>\n

Semakin tinggi kandungan hidrogen dalam cairan paduan aluminium, semakin banyak lubang kecil yang terbentuk pada paduan aluminium hasil pengecoran.<\/p>\n

Lubang-lubang kecil pada paduan aluminium cor tidak hanya mengurangi kedap udara dan ketahanan korosi coran, tetapi juga menurunkan sifat mekanis paduan tersebut. Untuk mendapatkan komponen aluminium cor yang bebas pori atau memiliki pori yang lebih sedikit, kuncinya terletak pada kondisi peleburan. Jika bahan penutup ditambahkan untuk perlindungan selama proses peleburan, jumlah gas yang terserap oleh paduan tersebut akan berkurang secara signifikan. Oleh karena itu, proses pemurnian aluminium cair selama pengecoran paduan aluminium dapat secara efektif mengendalikan kandungan hidrogen dalam aluminium cair.<\/p>\n

Dalam proses pengecoran paduan aluminium, apa pun metode pemurnian yang digunakan, tujuannya adalah untuk melakukan penghilangan gas, pemurnian, dan penyempurnaan paduan aluminium secara lebih baik, sehingga diperoleh hasil coran aluminium yang berkualitas tinggi dan memenuhi standar.<\/p>","protected":false},"excerpt":{"rendered":"

The refining of cast aluminum alloys uses chemical compounds to be added to molten aluminum to degas and remove slag. Refining is an important process step that cannot be missed in the aluminum alloy casting process. It can play the role of degassing, purifying and refining the aluminum alloy. It can also improve the plasticity […]<\/p>\n","protected":false},"author":1,"featured_media":4280,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-4272","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nRefining of Cast Aluminum used to Degas and Remove Slag<\/title>\n<meta name=\"description\" content=\"The refining of cast aluminum alloys uses chemical compounds fluxes to be added to molten aluminum to degas and remove slag.\" \/>\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\/refining-of-cast-aluminum\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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