IR-spectra and phases structure of sialons

Synthesis of SiCNAl(O) pre-alloyed nanopowders by pyrolysis of an aluminosilazane aerosol

“…Al-N 30,32,40 These results prove that aluminum can be fixed on a silazane monomer by direct reaction at room temperature between HMDS and TMA, with a methane evolution according to reaction (1).…”

The effect of mechanical activation on the properties of β-sialon precursors

“…8 and 9 show these spectra and the difference spectra in the region of aluminium-oxygen/nitrogen and silicon-oxygen/nitrogen vibrational bands, respectively. The strongest band in the 400-700 cm −1 region contains mainly contributions from Al-O and Al-N absorptions, whereas the 495 cm −1 and 601 cm −1 peaks are due to Si-O vibrations (Si 2 ON 2 group), according to Antsiferov et al 15 The absorption Fig. 7.…”

“…7) correspond to Al-O vibrations of the [AlO 6 ] octahedra 16 while the peaks at about 648 and 685 cm −1 are attributed to the A 1 and E 1 IR-active modes of AlN. 15,17 The effect of high-energy milling on the FTIR spectrum of the mixture can clearly be seen in Fig. 8 or 800 cm −1 are found in ␤-sialon, X-sialon and 15-R phase, respectively.…”

“…8 or 800 cm −1 are found in ␤-sialon, X-sialon and 15-R phase, respectively. 15 The appearance of this shoulder in the powder obtained after 45 min milling is probably due to the replacement of Si-N bonds by Al-O in the ␤-Si 3 N 4 lattice by reaction with Al 2 O 3 during high-energy milling.…”

The role of bulk and mass effects of reactions in reaction sintering processes

“…Кажущаяся простота этого пути осложнена возможностью получения в продукте примесей фаз SiC, AlN, Al 2 O 3 и других сиалоновых фаз в зависимости от параметров процесса, количест-ва углерода и чистоты исходных материалов [38,39]. Как показывают данные [19], существенное значение имеет также размер частиц в исходном сырье.…”