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Sintering temperature effect on structure and properties of Al2O3/Ni-P composites with interpenetrating phases |
| Jakub Michalski 2, Michal J. Wozniak 2, Katarzyna Konopka 2, Jerzy Bielinski 3, 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 |
A ceramic metal composite Al2O3/Ni-P was obtained by hot pressing of alumina powder, covered by Ni-P nanoparticles trough chemical plating. Room temperature, 600oC and 1000oC were used in these experiments to consolidate the coated powders. The consolidated and sintered specimens were investigated by SEM, TEM/HRTM, MFM (magnetic force microscope) and hardness test. They revealed that this fabrication method results in a structure of interpenetrating phases with high electric conductivity. It has been also found that samples consolidated at room temperature and sintered at 600oC maintain nanometric grain size of the metallic phase whilst the grains of Ni-P sintered in 1000oC are re-crystallized. The hardness was also investigated, and is discussed in terms of fabrication temperature and structure of obtained composites. |