{"id":7961,"date":"2021-12-08T03:37:53","date_gmt":"2021-12-08T03:37:53","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=7961"},"modified":"2021-12-08T03:37:53","modified_gmt":"2021-12-08T03:37:53","slug":"filtration-and-degassing-of-molten-metal","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/filtration-and-degassing-of-molten-metal\/","title":{"rendered":"Penyaringan dan Penghilangan Gas pada Logam Cair"},"content":{"rendered":"

Terdapat kebutuhan yang sangat besar untuk meningkatkan proses filtrasi dan penghilangan gas pada logam cair guna menghilangkan atau meminimalkan pengotor dalam produk cor akhir, terutama pada aluminium cair. Terutama, ketika logam hasil proses tersebut akan digunakan dalam produk dekoratif, seperti strip dekoratif atau produk dengan spesifikasi khusus, seperti komponen tempa dan ekstrusi pesawat terbang, serta foil ringan. Pengotor dapat menyebabkan hilangnya sifat-sifat produk cor akhir, seperti kekuatan tarik dan ketahanan terhadap korosi.<\/p>\n

Dalam praktiknya, logam cair\u2014terutama aluminium cair\u2014biasanya mengandung kotoran berbentuk gas dan padat yang merugikan bagi produk cor akhir. Setelah logam cair tersebut mengeras, kotoran-kotoran ini dapat memengaruhi produk cor akhir, yang pada gilirannya dapat menghambat proses pengolahan atau menyebabkan produk akhir memiliki keuletan yang buruk atau hasil akhir yang kurang memuaskan dalam hal karakteristik anodisasi.<\/p>\n

\"Penyaringan<\/p>\n

Penyaringan dan Penghilangan Gas pada Logam Cair<\/strong><\/p>\n

Teknologi pengolahan logam yang ketat dan pemurnian dengan pelarut telah meminimalkan terjadinya cacat semacam itu. Namun, untuk aplikasi-aplikasi kritis, upaya tersebut belum berhasil mengurangi terjadinya cacat tersebut hingga tingkat yang memuaskan. Proses flux manager memasukkan gas flux ke dalam tungku penampung yang berisi sejumlah logam cair. Prosedur ini mengharuskan tungku dimatikan sementara gas yang mengalir masih bersirkulasi, sehingga logam yang sedang diproses tetap stabil dan dapat diproses. Prosedur ini memiliki banyak kelemahan. Di antaranya, efisiensi berkurang karena tungku tidak beroperasi dalam waktu lama selama proses penambahan fluks, dan efisiensi juga berkurang akibat rendahnya rasio luas permukaan terhadap volume antara laju aliran gas dan logam cair.<\/p>\n

Sebagai alternatif dari proses fluks yang digunakan, perangkat penghilang gas daring<\/a> biasanya terletak di antara tungku penampung dan stasiun pengecoran. Hal ini membantu mengurangi ketidakefisienan yang disebabkan oleh penghentian operasi, namun belum begitu berhasil dalam meningkatkan efisiensi operasi itu sendiri, karena biasanya diperlukan sejumlah besar gas fluks per satuan logam cair.<\/p>\n

Secara umum, filtrasi peleburan<\/a> digunakan untuk mengurangi tingkat cacat-cacat yang disebutkan di atas. Bentuk filtrasi lelehan yang paling umum melibatkan penggunaan saringan kain kaca terbuka yang ditempatkan di kolam logam cair di atas ingot. Filter semacam itu ternyata hanya efektif sebagian karena hanya mampu menghilangkan inklusi berukuran besar. Filter lain yang umum digunakan adalah filter lapisan. Filter ini memiliki banyak kelemahan, di mana yang paling serius di antaranya mungkin adalah kesulitan yang sangat besar dalam mengontrol dan mempertahankan ukuran pori yang diperlukan untuk filtrasi yang efektif.<\/p>\n

Karena berbagai alasan, bahan busa keramik berpori sangat cocok untuk menyaring logam cair, termasuk karena kemampuan penyaringannya yang sangat baik, biayanya yang rendah, kemudahan penggunaannya, serta kemampuannya untuk digunakan sekali pakai dan dibuang setelah pemakaian. Filter busa keramik ini mudah dibuat, biayanya rendah, dan dapat digunakan sekali saja.<\/p>","protected":false},"excerpt":{"rendered":"

There is a great need to improve the filtration and degassing of molten metal to remove or minimize impurities in the final cast product, especially for molten aluminum. In particular, when the resulting metal will be used in decorative products, such as decorative strips or products with key specifications, such as aircraft forgings and extrusions, […]<\/p>\n","protected":false},"author":1,"featured_media":7963,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[24166,10313,10557],"class_list":["post-7961","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-filtration-and-degassing-of-molten-metal","tag-melt-filtration","tag-online-degassing"],"yoast_head":"\nFiltration and Degassing of Molten Metal, Melt Filtration<\/title>\n<meta name=\"description\" content=\"There is a great need to improve the filtration and degassing of molten metal to remove or minimize impurities in the final cast product.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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