{"id":3349,"date":"2020-10-16T06:18:38","date_gmt":"2020-10-16T06:18:38","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=3349"},"modified":"2020-10-16T06:18:38","modified_gmt":"2020-10-16T06:18:38","slug":"modification-treatment","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/modification-treatment\/","title":{"rendered":"Perawatan Modifikasi"},"content":{"rendered":"

Perlakuan modifikasi mengubah silikon eutektik dari serpihan kasar menjadi serat halus atau serpihan lamelar, sehingga meningkatkan sifat-sifat paduan tersebut. Perlakuan modifikasi ini terutama bertujuan untuk menghaluskan fase kedua atau mengubah morfologi dan distribusinya. Artikel ini terutama berfokus pada silikon eutektik dalam paduan aluminium-silikon. Jika tidak dimodifikasi, silikon eutektik berbentuk jarum dan serpihan kasar, yang menyebabkan penurunan sifat mekanis paduan, terutama ketangguhannya. Metamorfisme adalah proses perubahan morfologi dan ukuran silikon eutektik, yang mengubah bentuk serpihan eutektik asli menjadi serat halus atau bentuk lamelar.<\/p>\n

Berdasarkan bentuk zat pengubah dalam logam cair, mekanisme degradasi dibagi menjadi dua jenis: yang pertama adalah nukleasi kristal yang tidak homogen dari titik tak larut dalam logam cair; yang kedua adalah segregasi dan adsorpsi zat terlarut dalam logam cair.<\/p>\n

Studi perlakuan modifikasi tunggal pada paduan Al-Si menunjukkan bahwa unsur-unsur yang memiliki efek modifikasi terhadap silikon eutektik adalah: natrium (Na), strontium (Sr), unsur tanah jarang (RE), antimon (Sb), telur (Te), dan barium (Ba).<\/p>\n

\"Perawatan<\/p>\n

Natrium memiliki kemampuan metamorfik yang kuat dan merupakan bahan pertama serta yang paling banyak digunakan. Penambahan sejumlah kecil sekitar 0,005% hingga 0,01% dapat mengubah fase silikon eutektik dari berbentuk jarum menjadi serat yang seragam sepenuhnya. Namun, terdapat beberapa kekurangan, seperti efek degradasi yang mudah hilang\u2014hanya dapat dipertahankan selama 30 menit\u2014tingkat penyerapan yang rendah, kecenderungan peleburan untuk menguap meningkat, kepadatan yang rendah, alat dan peralatan mudah terkorosi, kesehatan pekerja terganggu, serta lingkungan tercemar parah. Untuk mengatasi kekurangan-kekurangan ini, telah diambil berbagai langkah seperti: memperbaiki kemasan natrium logam, mempercepat reaksi pengubah garam berbasis natrium, dan memperpanjang waktu kerja pengubah berbasis natrium; namun, langkah-langkah tersebut hanya dapat mengatasi sebagian masalah. Oleh karena itu, dalam banyak kasus, degradasi natrium secara bertahap digantikan oleh beberapa metode degradasi jangka panjang.<\/p>\n

Modifikator Sr adalah zat yang bekerja dalam jangka panjang pengubah<\/a>, efek degenerasi senyawa ini setara dengan Na, dan tidak memiliki kelemahan seperti yang terdapat pada degenerasi Na, misalnya durasi efek degenerasi yang singkat dan pencemaran lingkungan. Senyawa ini merupakan modifikator yang banyak digunakan saat ini. Dalam produksi industri, paduan Al-Sr yang mengandung 10% strontium umumnya digunakan sebagai modifikator. Rentang titik lelehnya berkisar antara 654 dan 770\u00b0C, sehingga mudah diserap oleh aluminium cair. Tingkat pemulihannya dapat mencapai 70% hingga 80%, dan mudah disimpan.<\/p>\n

Singkatnya, modifikator Sr memiliki keunggulan sebagai berikut: efek degradasi yang baik, dan efek degradasi tersebut dapat dipertahankan selama 68 jam; selama proses degradasi, penggunaannya praktis, tidak beracun, tidak mencemari lingkungan, tidak menyebabkan korosi pada peralatan, dan tidak membahayakan kesehatan. Sifat mekanis yang memuaskan pada hasil cor mudah dicapai. Modifier ini memiliki efek peleburan ulang tertentu; tingkat keberhasilan produk cornya tinggi, dan manfaat ekonomisnya secara keseluruhan sangat signifikan.<\/p>","protected":false},"excerpt":{"rendered":"

Modification treatment changes the eutectic silicon from coarse flakes to fine fibrous or lamellar flakes, thereby improving the properties of the alloy. The modification treatment is mainly to refine the second phase or change its morphology and distribution. In this article, it mainly focuses on the eutectic silicon in the aluminum-silicon alloy. When it is […]<\/p>\n","protected":false},"author":1,"featured_media":3350,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3349","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nModification Treatment of Al-Si Alloy | Sr Modifier for Aluminum<\/title>\n<meta name=\"description\" content=\"Modification treatment changes the eutectic silicon from coarse flakes to fine fibrous or lamellar flakes, thereby improving the properties.\" \/>\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\/modification-treatment\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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