کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9795974 | 1514939 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Purification of chromium by hydrogen plasma-arc zone melting
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Purification of chromium by hydrogen plasma-arc melting (H-PAM) and hydrogen plasma-arc zone melting (H-PZM) has been examined. Especially, reduction of non-metallic impurities, such as oxygen, nitrogen, carbon and sulfur, that have harmful influences on the mechanical properties of chromium, has been investigated. Two kinds of chromium, about 99% (2N-Cr) and 99.99% (4N-Cr) in purity, were used as the starting materials. Remarkable deoxidation, slight denitrogenization and decarburization of chromium were observed in H-PAM, while no reduction of sulfur was observed. Activated hydrogen atoms dissociated in high temperature plasma-arc probably take part in the refining reactions, e.g. deoxidation represented by O_Â +Â 2HÂ =Â H2O. In addition, it was found that oxygen, nitrogen, carbon and even sulfur concentrations were further reduced at the head side of chromium rods by segregation during H-PZM. Thus, H-PZM with both the segregation effect and the refining effect by H was available to decrease the non-metallic impurities of chromium.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 403, Issues 1â2, 25 August 2005, Pages 11-16
Journal: Materials Science and Engineering: A - Volume 403, Issues 1â2, 25 August 2005, Pages 11-16
نویسندگان
Kouji Mimura, Tetsufumi Komukai, Minoru Isshiki,