期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 506, 期 1, 页码 88-92出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.06.176
关键词
Amorphous materials; Mechanical alloying; Microstructure; Thermal analysis
资金
- National Natural Science Foundation of China (NSFC) [50902031]
- Harbin Institute of Technology [HITQNJS.2009.064]
Amorphous SiBCNAl powders have been prepared by mechanical alloying (MA) technique using crystalline silicon (Si), hexagonal boron nitride (h-BN), graphite (C) and aluminum (Al) as starting materials. Microstructural characterization was carried out by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and selected area diffraction (SAD). The results showed that the MA SiBCNAl powders were completely amorphous and no nanocrystalline structure had been detected. Si-29 and Al-27 solid-state nuclear magnetic resonance (NMR) spectra have provided evidence that Si and C atoms are intimately mixed at atomic levels and aluminium is present as mixed AlN4, AlN5/AlO4 and AlN6 units. Structural characterization by X-ray photoelectron spectroscopy (XPS) has shown the coexistence of chemical bonds formed by reactions of element of Si, B, C, N and Al. The thermal stability of SiBCNAl powders has been analyzed by thermogravimetry in argon. (c) 2010 Elsevier B.V. All rights reserved.
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