کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10626481 989685 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of nanophase tungsten carbide by electrical discharge machining
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Synthesis of nanophase tungsten carbide by electrical discharge machining
چکیده انگلیسی
Tungsten carbide nanopowders were synthesized successfully by electric discharge machining followed by annealing under a nitrogen atmosphere. The tungsten workpieces were initially melted and evaporated on the working surface during the electric discharge machining process, and then the tungsten powders were reacted with the carbon electrode and the working medium of kerosene to form the nanocrystalline WC1−x powders. The powders produced were characterized by XRD, SEM, and TEM. When annealing the powders under an N2 atmosphere, the cubic phases of WC1−x gradually changed to hexagonal W2C and then were transformed fully to nanocrystalline hexagonal WC at 1200 °C, with the nanocrystalline tungsten carbide encapsulated in a carbon shell. On the other hand, under an H2 atmosphere, the WC1−x phase changed via a W2C phase to reduced powders of pure tungsten at 1000 °C or were reduced directly from WC1−x to elemental W.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 31, Issue 8, 2005, Pages 1109-1115
نویسندگان
,