doi:10.3850/978-981-08-6555-9_124

ABSTRACT

Getters samples on the basis of nanocomposites taking in amorphous or crystalline Co-B-H nanoparticles and micronized AlN-powder have been prepared. The Co nanoparticles have been obtained via wet chemical reduction of CoSO₄.7H₂O initial salt with NaBH₄ using two kinds of reactors working at different hydrodynamics conditions of mixing of the water solutions (the solutions of CoSO₄ and NaBH₄). The nanocomposites have been synthesized by pressing of a mixture based on the Co nanoparticles and a micronized AlN-powder and sintering in the temperature interval of 200-850°C in a flow of pure N₂. The AlN has been introduced amounting to 10–30 wt. %. The Co nanoparticles, the micronized AlN-powder and the nanocomposites on their basis have been investigated by means of IR spectroscopy using Fourier Transform Infrared spectrophotometer EQUINOX 55 (Brucker). The FT-IR spectra undertaken of the Co nanoparticles, the AlN-powder and their nanocomposites have proved the creation of B-O, Al-N, Al-O chemical bonds in different atom groups such as BO₃ and BO₄ groups, AlO₄ tetrahedra and AlO₆ octahedra situated on the nano- and microparticles surface. The H₂ & CO molecules absorption of the synthesized getters in the temperature interval of 200 - 550°C has been measured.

Keywords: Co nanoparticles, Micronized AlN-powder, Nanocomposites, Getters, IR spectroscopy, FT-IR spectra, H₂ and CO molecules absorption.

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