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The influence of temperature and pressure on possibility of obtaining Al2O3/Ni-P nanocomposite through hot pressing process. |
| Jakub Michalski 2, Katarzyna Konopka 2, Stanisław Gierlotka 1, Krzysztof J. Kurzydlowski 2 |
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1. Polish Academy of Sciences, High Pressure Research Center (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland |
| Abstract |
The influence of temperature and pressure on Ni-P nanoparticles during sintering of Al2O3/Ni-P nanocomposites under high pressure was investigated in this paper. The fine-grained alumina powder was covered with Ni-P nanoparticles of 20-50 nm sizes by electroless nickel plating. The material was sintered in two temperatures: 900 and 1400oC, using pressures above 5 GPa. It was found that sintering in such conditions gave a possibility to maintains nanometrical size of Ni-P particles. In the case of 1400oC the metallic phase melted and non-uniform grain growth of ceramic was observed. Hot pressing at 900oC allowed for the metal to remain in a solid state and ensured a uniform microstructure of the nanocomosites, characterized by 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 developing a technology for ceramic-metal composites in various applications. |