کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7990669 1516130 2018 31 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, ceramic conversion and microstructure evolution of HfC-based nanocomposites derived from precursors with different nitrogen contents
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Synthesis, ceramic conversion and microstructure evolution of HfC-based nanocomposites derived from precursors with different nitrogen contents
چکیده انگلیسی
Precursors with different nitrogen contents were synthesised using hafnium (IV) chloride (HfCl4), dicyandiamide (DICY) and triethylamine (Et3N) as raw materials and were used for preparing Hf-based nanocomposites. The synthesis, ceramic conversion and microstructural evolution of HfC-based nanocomposites derived from precursors with different nitrogen contents were investigated. The results indicate that the composition of the synthesised precursors can be controlled by adjusting the molar ratio of HfCl4 and dicyandiamide. Pyrolysis of the precursors at 1200 °C led to the formation of Hf2CN or HfN-based ceramics. As the nitrogen content of the synthesised precursors increased, the Hf2CN crystallites present in the ceramics annealed at 1200 °C gradually transformed to HfN. Furthermore, at 1600 °C, the HfN and Hf2CN phases gradually converted to HfC(N). The results also indicate that nitrogen favours the sintering of the obtained nanocomposites. The HfC-based ceramics should be promising for application as high-performance composite ceramics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 764, 5 October 2018, Pages 387-396
نویسندگان
, , , , ,