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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Mechanical and dielectric properties of Ni/Al2O3 composites
LUO Fa(罗  发), XUE Hui(薛  晖), ZHU Dong-mei(朱冬梅), ZHOU Wan-cheng(周万城)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:Ni/Al2O3 composites were prepared by hot pressing approach. The relationship between their microstructure, mechanical, dielectric and magnetic properties with Ni particle content was studied. By increasing the amount of, metal in the composite, the relative density and the bending strength decrease gradually. The possible reason is that non-wetting between Ni and alumina in the preparation results in weak adhesion of the Ni/Al interface. For the composites, the maximum fracture toughness is 6.4 MPa∙ m1/2, which is about 25% higher than that of pure alumina ceramic. The increase in toughness of the Ni/Al2O3 composites is due to the deformation of nickel particles. The complex dielectric constant measurements indicate that the real part and the imaginary part increase greatly with the Ni content in the frequency range of 8.2−12.4 GHz. The real part and the imaginary part of complex permeability of the composites also increase with increasing Ni content.

 

Key words: Al2O3/Ni composites; dielectric property; magnetic property; mechanical property

ISSN 1672-7029
CN 43-1423/U

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