کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1603982 1516003 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of additives on synthesis of vanadium carbide (V8C7) nanopowders by thermal processing of the precursor
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Effects of additives on synthesis of vanadium carbide (V8C7) nanopowders by thermal processing of the precursor
چکیده انگلیسی

Vanadium carbide (V8C7) nanopowders can be synthesized by thermal processing of the precursor of ammonium vanadate (NH4VO3) and nanometer carbon black. Effects of additives (CaF2, CeCl3·7H2O and LaCl3·7H2O) on the phase composition and microstructure of the synthesized powders were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that additives (CaF2, CeCl3·7H2O and LaCl3·7H2O) can accelerate the solid state reaction during synthesis of V8C7, and these additives play a vital role in determining the phase composition and microstructure. V8C7 powders with basically single phase can be synthesized at 1100 °C for 0.5 h with the addition of additives (CaF2, CeCl3·7H2O and LaCl3·7H2O), and the powders show good dispersion and are mainly composed of uniformly-sized spherical particles with a mean diameter of ∼50 nm. Further experiment shows that V8C7 powders can be prepared at 950 °C for 1 h with 1.0 wt% CaF2 as additive.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 27, Issue 6, November 2009, Pages 971–975
نویسندگان
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