{"id":4379,"date":"2020-11-20T01:56:41","date_gmt":"2020-11-20T01:56:41","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=4379"},"modified":"2020-11-20T01:56:41","modified_gmt":"2020-11-20T01:56:41","slug":"modification-of-al-si-alloy","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/modification-of-al-si-alloy\/","title":{"rendered":"Modifikasi Paduan Al-Si"},"content":{"rendered":"

Paduan Al-Si hipereutektik memiliki kandungan silikon yang tinggi, yang dapat menurunkan koefisien muai panas paduan dan meningkatkan ketahanan aus. Paduan ini cocok untuk komponen yang tahan aus, seperti piston pada mesin pembakaran dalam. Dalam struktur paduan Al-Si hipereutektik terdapat silikon primer berbentuk lempengan dan silikon eutektik berbentuk jarum. Kristal silikon primer sebagai titik keras dapat meningkatkan ketahanan aus paduan, tetapi karena sifatnya yang keras dan rapuh, hal ini tidak menguntungkan bagi sifat mekanis paduan dan menurunkan kinerja pemotongan paduan. Oleh karena itu, modifikasi paduan Al-Si diperlukan.<\/p>\n

\"Modifikasi<\/p>\n

Sudah sejak lama, proses pemurnian silikon kristal primer telah diteliti secara mendalam. Dengan menggunakan metode kristalisasi getaran ultrasonik, metode pendinginan cepat, peleburan dengan suhu berlebih, pengecoran suhu rendah, dan sebagainya, hasil tertentu dapat dicapai. Namun, efek yang paling stabil dan paling bernilai dalam industri adalah penambahan modifikator paduan aluminium<\/a>.<\/p>\n

Saat ini, bahan pengubah yang sebenarnya digunakan dalam produksi adalah fosfor unsur. Penggunaan fosfor merah yang paling awal, ketika jumlah penambahan sebesar 0,5% dari berat paduan, silikon primer dapat dimurnikan. Namun, karena fosfor memiliki titik nyala yang rendah (240\u00b0C), pengangkutannya tidak aman. Jika terurai, fosfor akan terbakar dengan hebat, menghasilkan banyak asap, mencemari udara, dan juga menyebabkan cairan aluminium menyerap lebih banyak gas, sehingga fosfor sering dicampur dengan senyawa lain. Metode yang lebih umum digunakan dalam industri ini adalah dengan menambahkan dalam bentuk paduan induk Cu-P. Kandungan fosfor dalam paduan induk umumnya berkisar antara 8% hingga 10%, dan jumlah penambahannya berkisar antara 0,5% hingga 0,8%.<\/p>\n

Mengenai mekanisme modifikasi paduan Al-Si oleh fosfor, secara umum diyakini bahwa fosfor membentuk sejumlah besar partikel AlP dengan titik leleh tinggi bersama Al dalam cairan paduan. Struktur kristal AlP dan fase silikon serupa, serta konstanta kisi keduanya juga serupa. AlP memiliki struktur zinc blende. Konstanta kisi a = 5,451, titik lelehnya 1060\u00b0C; konstanta kisi a = 5,428 pada kristal silikon; jarak antaratom minimum antara AlP dan silikon juga sangat dekat, yaitu silikon sebesar 2,44, AlP sebesar 2,56; AlP dapat digunakan sebagai inti silikon primer non-spontan untuk memurnikan silikon yang baru terbentuk.<\/p>","protected":false},"excerpt":{"rendered":"

Hypereutectic Al-Si alloy has a high silicon content, which reduces the thermal expansion coefficient of the alloy and improves wear resistance. It is suitable for wear-resistant parts such as pistons of internal combustion engines. There are tabular primary silicon and needle-shaped eutectic silicon in the hypereutectic Al-Si alloy structure. Primary crystal silicon as a hard […]<\/p>\n","protected":false},"author":1,"featured_media":4406,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-4379","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nModification of Al-Si Alloy | Aluminum Alloy Modifier<\/title>\n<meta name=\"description\" content=\"The modification of Al-Si alloy is necessary, and the most valuable in industry is the addition of aluminum alloy modifier.\" \/>\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-of-al-si-alloy\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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