{"id":3474,"date":"2018-08-07T03:37:22","date_gmt":"2018-08-07T03:37:22","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=3474"},"modified":"2018-08-07T03:37:39","modified_gmt":"2018-08-07T03:37:39","slug":"molten-metal-cleanliness-casting-aluminium","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/id\/molten-metal-cleanliness-casting-aluminium\/","title":{"rendered":"Kebersihan Logam Cair pada Proses Pengecoran Aluminium"},"content":{"rendered":"

Kebersihan Logam Cair pada Proses Pengecoran Aluminium<\/strong><\/p>\n

Paduan aluminium memiliki karakteristik berupa berat jenis yang rendah, titik leleh yang rendah, kelarutan gas yang dapat diabaikan kecuali hidrogen, kemampuan pengecoran yang sangat baik, kemudahan pemesinan yang baik, serta ketahanan korosi yang baik. Pengecoran berkualitas premium merupakan syarat mutlak bagi komponen struktural kritis yang digunakan dalam industri otomotif dan penerbangan. Produksi pengecoran semacam itu menuntut agar inklusi dan porositas diminimalkan (atau bahkan dihilangkan) guna menekan pengaruh merugikannya terhadap sifat mekanis, sehingga sifat-sifat tersebut kemudian terutama dikendalikan oleh mikrostruktur pengecoran.<\/p>\n

Kebersihan Logam Cair pada Proses Pengecoran Aluminium<\/strong>
\nAdanya inklusi non-logam yang keras dalam paduan aluminium tidak hanya dapat menurunkan sifat mekanis produk akhir, tetapi juga menimbulkan sejumlah masalah lain yang berkaitan dengan proses pengecoran cetakan, antara lain sebagai berikut:<\/strong><\/p>\n

\u2022 penurunan sifat mekanis coran
\nBaik kekuatan tarik maupun perpanjangan mengalami penurunan drastis seiring dengan meningkatnya kandungan inklusi. Logam murni, secara umum, memiliki sifat-sifat tarik yang tinggi (kekuatan leleh, kekuatan tarik maksimum, persentase perpanjangan).<\/p>\n

\u2022 kemampuan pemesinan yang buruk dan keausan alat yang tinggi
\nBeberapa inklusi yang sering ditemukan dalam hasil pengecoran adalah partikel keramik yang rapuh dan sangat keras. Tingkat kekerasan beberapa inklusi tersebut dapat diukur berdasarkan skala Mohs, dengan nilai 10 sebagai patokan untuk berlian. Apabila lelehan paduan dibersihkan melalui penyaringan sebelum proses pengecoran, kemudahan pemesinan akan meningkat secara signifikan<\/p>\n

\u2022 hilangnya kelancaran dan sifat-sifat yang mendukung proses pemberian makan
\nKandungan asing dalam logam cair menyebabkan penurunan kelancaran aliran. Produksi logam cair yang bersih melalui proses filtrasi dapat meningkatkan kelancaran aliran secara signifikan, hingga sebesar 30% pada suhu operasi normal.<\/p>\n

\u2022 peningkatan porositas gas
\nKadar hidrogen terlarut dalam logam cair paduan aluminium merupakan faktor utama yang menyebabkan terbentuknya porositas gas selama proses pembekuan. Batas kelarutan hidrogen dalam aluminium cair cukup tinggi, namun berkurang secara signifikan ketika
\nLogam mengeras, sehingga menyebabkan terbentuknya porositas gas. Porositas gas setelah proses pengerasannya tidak hanya bergantung pada kandungan hidrogen dalam logam cair, tetapi juga pada kebersihan logam. Oksida berperan sebagai titik inisiasi pembentukan pori, sedangkan hidrida
\nterurai saat didinginkan sehingga menghasilkan hidrogen terlarut.<\/p>\n

\u2022 kualitas permukaan yang buruk dan kurangnya kedap tekanan
\nCacat pada produk aluminium, seperti lubang jarum pada lembaran tipis dan goresan seperti pisau cukur pada pelat litografis, umumnya disebabkan oleh inklusi. Inklusi dengan diameter efektif berkisar antara 10\u201320 \u03bcm dapat menimbulkan dampak merugikan pada produk aluminium canai, bahkan pada konsentrasi beberapa bagian per juta.<\/p>\n

\"Kebersihan<\/p>\n

ADTECH<\/a> merupakan salah satu pelopor yang diikuti oleh International Enterprise, yang terus berfokus pada produksi bahan metalurgi.
\n1. Filter Busa Keramik
\n2. Unit Penghilang Gas
\n3. Kotak Filter
\n4. Seri pengecoran hot-top
\n5. Nozel pengecoran gulung
\n6. Seri Flux
\n7. Bahan Metalurgi Lainnya<\/p>","protected":false},"excerpt":{"rendered":"

Molten Metal Cleanliness When Casting Aluminium Aluminum alloys are characterized by their low specific weight, low melting point, negligible gas solubility with the exception of hydrogen, excellent castability, good machinability, and good corrosion resistance. Premium quality castings are an essential requisite for the critical structural…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[52],"tags":[],"yoast_head":"\nMolten Metal Cleanliness When Casting Aluminium<\/title>\n<meta name=\"description\" content=\"Molten Metal Cleanliness When Casting Aluminium Aluminum alloys are characterized by their low specific weight, low melting point, negligible gas......\" \/>\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.adtechamm.com\/id\/molten-metal-cleanliness-casting-aluminium\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten Metal Cleanliness When Casting Aluminium\" \/>\n<meta property=\"og:description\" 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