کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5368151 1388385 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Laser synthesis of nitrides on the surface of refractory metals immersed in liquid nitrogen
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Laser synthesis of nitrides on the surface of refractory metals immersed in liquid nitrogen
چکیده انگلیسی

In this paper we describe an approach for the formation of composite layers on the surface of refractory metals. We show that laser radiation on refractory metals (Ti, V, Zr, Mo, Hf, Ta, and W) immersed in liquid nitrogen can provide a chemical synthesis of nitride phases on the surface of metals. The metals were subjected to pulsed laser radiation with a wavelength of 1.06 μm. The power density ranged from 104 to 109 W cm−2. The synthesis of nitrides began with the formation of MexNy (x > y) phases with low contents of nitrogen. When the melting point was reached at the metal surface, the quantity of MeN phases increased sharply. Study of the melting zone showed that it contained a non-uniform distribution of nitride phases. The quantity of nitrides was a maximum on the surface and decreased with the increase of the depth of melting zone. Due to the high-cooling rates, titanium nitride crystallized in the form of columns. Maximum microhardness in the Ti surface layer was up to 20,000 MPa.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 254, Issue 4, 15 December 2007, Pages 961-965
نویسندگان
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