Influence of Temperature and Pressure on the Possibility of Obtaining Al2O3/Ni-P Nanocomposite through Hot Pressing Process

J. Michalski; K. Konopka; Stanislaw Gierlotka; Krzysztof Jan Kurzydlowski

doi:10.4028/www.scientific.net/SSP.101-102.147

Paper Titles

Mechanical Properties of Aluminium Wires Produced by Plastic Consolidation of Fine Grained Powders
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The Structure of Nanocrystalline Stainless Steel Powders Obtained by Ball Milling and Duplex Stainless Steel Formed by Their Sintering
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Novel Ceramic-Metal Composites with Metal Phase from Micro to Nanosize
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Al₂O₃-Fe Functionally Graded Materials Fabricated under Magnetic Field
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Influence of Temperature and Pressure on the Possibility of Obtaining Al₂O₃/Ni-P Nanocomposite through Hot Pressing Process
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Investigation of the Microstructure of SiC-Zn Nanocomposites by Microscopic Methods: SEM, AFM and TEM
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Synthesis of Metal-Ceramic Nanocomposites by High-Pressure Infiltration
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Phase Transformations in Carbon Steel Powders Subjected to Ball Milling
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Grain Boundary Microstructural Control in Nanocrystalline Ni and Ni-20mass%Fe Alloy by Magnetic Annealing
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Influence of Temperature and Pressure on the Possibility of Obtaining Al₂O₃/Ni-P Nanocomposite through Hot Pressing Process

Abstract:

The influence of sintering temperature and high pressure on Ni-P nanoparticles in Al2O3/Ni-P nanocomposites was investigated in this paper. The fine-grained alumina powder was covered with Ni-P nanoparticles of 20 – 50 nm size by electroless nickel plating. The material was sintered in temperatures from 900 to 1400oC using pressures above 5 GPa. It was found that sintering in such conditions give a possibility to maintain nanometrical size of Ni-P particles. In the case of 1400oC the metallic phase melts and non-uniform grain growth of ceramic was observed. Hot pressing at 900oC allowed for the metal to remain in solid state and ensured uniform microstructures of the nanocomposites, with uniform distribution of nanometrical Ni-P grains in the ceramic matrix. In this temperature the grain growth of the ceramic was not observed. The results are discussed in terms of technology for production of ceramic-metal composites for various applications.