{"id":4074,"date":"2020-11-07T01:12:19","date_gmt":"2020-11-07T01:12:19","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=4074"},"modified":"2020-11-07T01:12:19","modified_gmt":"2020-11-07T01:12:19","slug":"refining-of-cast-aluminum-alloys","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/refining-of-cast-aluminum-alloys\/","title":{"rendered":"Pemurnian Paduan Aluminium Cor"},"content":{"rendered":"

Proses pemurnian paduan aluminium cor menggunakan senyawa untuk penghilangan gas dan penghilangan terak. Pemurnian merupakan tahap proses yang penting dalam proses pengecoran paduan aluminium. Proses ini dapat menghilangkan gas, memurnikan, dan menyempurnakan paduan aluminium. Selain itu, proses ini juga dapat meningkatkan plastisitas dan ketangguhan paduan aluminium cor serta mempersiapkannya untuk pengerasan presipitasi.<\/p>\n

Paduan aluminium cor memiliki sifat kimia yang relatif aktif. Saat proses pengecoran dan peleburan, paduan ini mudah bereaksi dengan uap air sehingga mengalami oksidasi dan menyerap hidrogen. Oleh karena itu, cacat seperti inklusi dan pori-pori kecil akan terbentuk saat aluminium cair mengeras menjadi coran aluminium. Cacat-cacat ini akan memengaruhi sifat mekanis coran aluminium.<\/p>\n

Saat ini, terdapat dua metode pemurnian paduan aluminium cor<\/p>\n

1. Metode pemurnian adsorpsi: terutama meliputi pemurnian fluks<\/a> metode, metode flotasi degassing, dan Filtrasi CFF<\/a> metode;<\/p>\n

2. Metode pemurnian non-adsorpsi: perlakuan vakum dan perlakuan ultrasonik.<\/p>\n

Proses pemurnian paduan aluminium cor dapat melarutkan sepenuhnya semua fase dalam paduan tersebut, memperkuat struktur paduan, meningkatkan ketangguhan dan ketahanan terhadap korosi, menghilangkan tegangan, serta melunakkan paduan, sehingga memungkinkan dilakukannya proses pengolahan atau pembentukan lebih lanjut.<\/p>\n

\"Pemurnian<\/p>\n

Selain terhirup saat proses peleburan, paduan aluminium cor juga terhirup saat dituangkan ke dalam cetakan. Seiring penurunan suhu, kelarutan gas pun berkurang, dan gas berlebih mengendap, di mana sebagian di antaranya tidak dapat keluar. Gas yang tertahan dalam coran aluminium tersebut membentuk lubang-lubang kecil, yang umumnya disebut sebagai \u201cpinholes\u201d.<\/p>\n

Gas dalam paduan aluminium cor terkadang digabungkan dengan ruang penyusutan, dan gas yang mengendap dalam aluminium cair tertahan di dalam ruang penyusutan tersebut. Jika tekanan yang dihasilkan oleh gelembung akibat pemanasan besar, permukaan lubang akan halus dan terdapat lapisan berkilau di sekeliling lubang; sebaliknya, permukaan lubang akan menjadi berkilau. Jika tekanan yang dihasilkan oleh gelembung kecil, permukaan bagian dalam lubang akan berkerut dan menunjukkan ciri-ciri penyusutan.<\/p>\n

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

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

Terlepas dari metode pemurnian apa pun yang digunakan, tujuannya adalah untuk menghilangkan gas, memurnikan, dan memproses paduan aluminium tersebut, sehingga diperoleh coran aluminium berkualitas tinggi dan memenuhi standar.<\/p>","protected":false},"excerpt":{"rendered":"

The refining of cast aluminum alloys uses compounds for degassing and slag removal. Refining is an important process step in the process of aluminum alloy casting. It can degass, purify and refine aluminum alloy. It can also improve the plasticity and toughness of cast aluminum alloy and prepare for precipitation hardening. Cast aluminum alloy has […]<\/p>\n","protected":false},"author":1,"featured_media":4075,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-4074","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nRefining of Cast Aluminum Alloys by Flux Refining and CFF Filtration<\/title>\n<meta name=\"description\" content=\"The refining process of cast aluminum alloys can fully dissolve all phases in the alloy, improve the toughness and corrosion resistance.\" \/>\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-alloys\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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