The influence of temperature and pressure on possibility of obtaining Al2O3/Ni-P nanocomposite through hot pressing process.

Jakub Michalski 2Katarzyna Konopka 2Stanisław Gierlotka 1Krzysztof J. Kurzydlowski 2

1. Polish Academy of Sciences, High Pressure Research Center (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, 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.

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium G, by Jakub Michalski
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-14 12:14
Revised:   2009-06-08 12:55
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