Mechanical and dielectric properties of Ni/Al2O3 composites
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.
Al2O3/Ni composites dielectric property magnetic property mechanical property
LUO Fa XUE Hui ZHU Dong-mei ZHOU Wan-cheng
State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）