Interface Structure of Ag/SnO2 Nanocomposite Fabricated by Reactive Synthesis

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (1): 49-55.

• Nanomaterialsand Nanotechnology • Previous Articles Next Articles

Interface Structure of Ag/SnO₂ Nanocomposite Fabricated by Reactive Synthesis

Jingchao Chen, Jing Feng, B. Xiao, K.H. Zhang, Y.P. Du, Z.J. Hong

1) Key Laboratory of Advanced Materials of Precious-Nonferrous Metals, Education Ministry of China, and Key Lab of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China
2) State Key Laboratory of Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi0an Jiaotong University, Xi0an 710049, China

Received:2008-10-29 Revised:2010-01-22 Online:2010-01-31 Published:2010-01-22
Contact: FENG Jing
Supported by:
the National Natural Science Foundation of China (Nos. 2008CB617609, u0837601, u0837603 and 50874054)
the Science Innovation Foundation of Kunming University of Science and Technology.

Abstract

Abstract:

The electric contact material of Ag/SnO₂ composite was achieved by reactive synthesis method. The com-positions and microstructure of Ag/SnO₂ composite were analyzed and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution electron microscopy (HRTEM). The structural feature was typical of the particle reinforced composites. The HRTEM images revealed that the observed Ag/SnO₂ interface was absence of the precipitated phase and the lattice contrast across the interface was clear and sharp. The average particle size of SnO₂ in composite was near 50 nm and it was well dispersed in spherical shape. The thermodynamic mechanism of reactive synthesis method was also discussed. The electronic density distribution analysis of the interface showed the charges of Ag atoms transmitted to O
atoms and the conductivity of the material was also affected. No extra compounds expected such as Ag_xO_y formed at interface. The distribution of electrons was of inequality near the interface which explained why the mechanical property of the metal/ceramic materials was improved but the machining property declined.

Key words: Metal-matrix composites, Electric contact material, Interface, In situ

Jingchao Chen, Jing Feng, B. Xiao, K.H. Zhang, Y.P. Du, Z.J. Hong. Interface Structure of Ag/SnO₂ Nanocomposite Fabricated by Reactive Synthesis[J]. J Mater Sci Technol, 2010, 26(1): 49-55.

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Interface Structure of Ag/SnO₂ Nanocomposite Fabricated by Reactive Synthesis

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