{"id":7406,"date":"2020-10-14T08:12:07","date_gmt":"2020-10-14T08:12:07","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=7406"},"modified":"2020-10-14T08:12:07","modified_gmt":"2020-10-14T08:12:07","slug":"aluminium-degassing-with-nitrogen","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/id\/aluminium-degassing-with-nitrogen\/","title":{"rendered":"Penghilangan Gas dari Aluminium Menggunakan Nitrogen"},"content":{"rendered":"

Penghilangan gas dari aluminium dengan nitrogen biasanya dilakukan menggunakan deaerator impeler berputar (RID)<\/strong>. Sebenarnya, tidak semua deaerator rotari itu sama. Penting untuk memiliki desain kepala yang optimal guna menghasilkan gelembung-gelembung kecil dengan efisiensi tinggi. Dengan memperpendek waktu pemrosesan dan mengurangi penggunaan gas, penghematan biaya yang signifikan dapat dicapai.<\/p>\n

Dulu, industri pengecoran logam cenderung memilih desain kepala yang sederhana dan biaya produksi yang lebih rendah, namun hal ini dapat menyebabkan terbentuknya gelembung yang lebih besar. Karena efisiensi yang berkurang, pendekatan ini justru menimbulkan penghematan yang semu.<\/p>\n

Setelah perangkat penghilang gas diturunkan sepenuhnya ke posisi di mana logam cair dan poros sudah berada di tempatnya, proses penghilangan gas pada aluminium dengan nitrogen dapat dimulai.
\nPosisi poros yang paling ideal adalah sedikit menyimpang dari garis tengah kotak untuk membantu mencegah pembentukan pusaran dan perputarannya yang melingkar di dalam logam cair. Jarak penyimpangannya adalah 2\u20134 inci.
\nTeknologi Periklanan Unit Penghilang Gas Aluminium<\/a> menggunakan sekat dalam desain kotak tersebut, karena sekat-sekat tersebut menghambat peredaran logam dan mengurangi pembentukan arus eddy.
\nSetelah dilepas pada posisi yang benar, unit harus dinyalakan dan kecepatan poros harus diatur menjadi 300 rpm. Aliran gas inert juga harus diaktifkan, dan operator harus menyesuaikan aliran gas serta kecepatan poros.
\nKetika gelembung-gelembung naik ke permukaan logam cair, aliran gas harus ditingkatkan hingga gelembung-gelembung tersebut terlihat.
\nSeiring dengan meningkatnya aliran gas, ukuran gelembung-gelembung tersebut juga semakin besar.<\/p>\n

\"Penghilangan<\/p>\n

Hasil ideal dari proses penghilangan gas pada aluminium dengan nitrogen adalah tersebarnya gelembung-gelembung kecil secara merata sambil tetap mempertahankan permukaan yang relatif tenang.<\/strong>
\nSaat menentukan kombinasi terbaik antara laju aliran dan kecepatan poros, harap perhatikan parameter-parameter yang akan digunakan di masa mendatang.
\nPerhatikan juga total waktu degassing, yang biasanya berkisar antara 4 hingga 8 menit, kecuali jika suhunya sangat tinggi atau jumlah gas yang dibutuhkan sangat sedikit.<\/p>\n

Berikut ini adalah lima jenis ketidaksempurnaan utama yang ditemukan pada coran aluminium<\/strong><\/p>\n

Penyusutan\u2014Cacat penyusutan terjadi selama proses pengeringan. Cacat penyusutan terbuka ditemukan pada permukaan coran, sedangkan ketika terbentuk kantong cairan yang terisolasi di dalam logam yang telah mengeras, maka terbentuklah cacat penyusutan tertutup di bagian dalam coran.
\nPorositas gas\u2014Aluminium cair dapat menampung gas terlarut dalam jumlah besar, sedangkan aluminium padat tidak dapat melakukannya. Akibatnya, gas tersebut akan membentuk gelembung di dalam logam saat mendingin, sehingga mengurangi kekuatan keseluruhan coran. Porositas gas umumnya disebabkan oleh hidrogen terlarut dalam logam cair.
\nCacat pengecoran logam\u2014kesalahan dapat terjadi saat menuangkan logam cair. Logam cair mungkin tidak mengisi seluruh rongga cetakan, sehingga menimbulkan bagian yang tidak terisi. Atau, kedua tepi depan logam mungkin tidak menyatu dengan baik di dalam rongga cetakan, sehingga menimbulkan titik-titik lemah.
\nCacat metalurgi\u2014Terkadang, komposisi kimia logam tidak dapat memberikan kondisi pendinginan yang optimal. Hal ini dapat menyebabkan munculnya titik panas\u2014yaitu area yang keras pada permukaan coran yang mendingin lebih cepat daripada logam di sekitarnya.
\nCacat cetakan\u2014logam menjadi rapuh saat panas. Jika cetakan tidak dirancang dengan benar, tegangan sisa akan timbul pada bahan selama proses pendinginan, yang dapat menyebabkan retakan termal.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminium Degassing With Nitrogen is usually done using a rotating impeller deaerator (RID). In fact, not all rotary deaerators are the same. It is important to have an optimal head design to produce high efficiency, small bubbles. By shortening the processing time and reducing the…<\/p>","protected":false},"author":1,"featured_media":7407,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[45391],"tags":[],"yoast_head":"\nAluminium Degassing With Nitrogen | Adtech China<\/title>\n<meta name=\"description\" content=\"Aluminium Degassing With Nitrogen is usually done using a rotating impeller deaerator (RID). 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