کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5457871 | 1515948 | 2018 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure evolution and formation of needle-like WO3 nanowire during sintering of submicron tungsten particles
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this study, an interesting phenomenon was observed related to sintering of tungsten sub-micron powders in hydrogen atmosphere. Initial tungsten compacts containing 80Â wt% micro powder and 20Â wt% submicron particles (size of 100-600Â nm) were sintered in hydrogen atmosphere. SEM, XRD and EDS analysis were used to studying the micro-structural details. The obtained results exhibited an interesting oxidation-condensation phenomenon in sintered specimens that resulted into formation of needle-like WO3 nanowires on the particle surfaces. Also, submicron particles accelerate the sintering of tungsten powders due to faceted-nonfaceted transformation mechanism. The obtained results proposed that oxygen content in initial powders can be considered as required oxygen source for nucleation and growth of WO3 nano-structure. In this condition, the nanowires extend via solid-phase growth from nanowire nuclei generated on the W particles surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 70, January 2018, Pages 93-100
Journal: International Journal of Refractory Metals and Hard Materials - Volume 70, January 2018, Pages 93-100
نویسندگان
M. Ahangarkani, K. Zangeneh-madar, S. Borji,