The AlMnCe/Al2O3 metal/ceramic composite with 3D micro-cellular structure is prepared by spark plasma sintering (SPS) at 520 ℃. It consists of consecutive nano-Al2O3 sintering body phase and AlMnCe alloy discrete phase. The microstructure of sample, characteristic of the micro-cellular structure and microstructure of the interface are investigated via scanning electron microscope (SEM) and transmission electron microscope (TEM) method. The results indicate that two kinds of interfaces are formed in the sample during SPS process, one is the micro-nano type metal/ceramic interface between the metal cellular body and the nano-ceramic cellular wall, the other is the nano-nano type ceramic/ceramic interface in the nano-ceramic cellular wall. The fusion transition area with a width 200-300 nm at interface of the AlMnCe alloy and nano-Al2O3 sintering body is formed. The AlMnCe alloy has a sufficient immersional wetting for the Al2O3 cellular wall. The bonding of interface between the nano-Al2O3 sintering body and the AlMnCe alloy particle is powerful, and new phase and crack is not found.
Wang Shuxia, Li Shaolong, Jiang Qiuyue, Shi Lei, Wang Minggang, Jia Suqiu, Zhao Zhankui Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130012, China
Soft magnetic composite with micro-cellular structure was prepared by spark plasma sintering(SPS) process with Fe73.5Cu1Nb3Si13.5B9 micron-powders clad by 5wt% Zn0.5Ni0.5Fe2O4 nano-particles.The effect of SPS on the micro structure of the Finemet powder and the micro structure of the composite were studied.It has been found that the as-prepared composite consists of Fe73.5Cu1Nb3Si13.5B9 cells and the cell-wall composed of nano Zn0.5Ni0.5Fe2O4 particles distributing around Fe73.5Cu1Nb3Si13.5B9 cell-body.The composite exhibits low eddy-current loss which is to be resulted by high resistivity of the Zn0.5Ni0.5Fe2O4 cell-wall.The sintered samples were annealed at different temperature and the magnetic properties at different frequency of the annealed samples were measured.It shows that the Zn0.5Ni0.5Fe2O4 cell-wall possesses good thermostability.
