A few samples of nanocrystalline TiN - TiB2 ceramics were synthesized by high-pressure (3,0 GPa) and high-temperature (t = 1300 - 1500 <$E symbol Р>C) sintering a mixture of TiN and TiB2 nanopowders (80 wt. % TiN and 20 wt. % TiB2) and the microhardness of the samples was determined. Peculiarities of the chemical bonding of the TiN - TiB2 ceramics possessing the highest microhardness among the samples under consideration, mainly <$E 29,65~symbol С~0,90> GPa, were studied in the present work using the X-ray emission and photoelectron spectroscopy methods. The X-ray emission spectra reflecting the energy distribution of the valence electronic states of the constituents (the N <$E K alpha> (N 2p-like states), В <$E K alpha> (B 2p-like states), Ti <$E L alpha> (valence Ti s,d-like states) and Ti <$E K beta sub 5> (Ti 4p-like states) bands) were measured for the mentioned ceramics and for the initial mixture of TiN and TiB2 nanopowders. For the above substances the X-ray photoelectron core-level binding energies were evaluated as well. It has been established that, when synthesizing the nanocrystalline TiN - TiB2 ceramics from the initial mixture of TiN and TiB2 nanopowders, the half-widths of the X-ray emission Ti <$E L alpha> and Ti <$E K beta sub 5> bands decrease by (0,5 - 0,6) <$E symbol С> 0,2 eV.

Індекс рубрикатора НБУВ: К391.91 + В371.236 + В377.13

Рубрики:

Виробництво композитних металокерамічних матеріалів і виробів

Електронна емісія

Шифр НБУВ: Ж14388 Пошук видання у каталогах НБУВ 

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