Si3N4–TiN Composites Produced by Hot-Pressing Silicon Nitride and Titanium Powders

Autor:	A. S. Lysenkov, S. N. Perevislov, N. A. Ovsyannikov, A. A. Konovalov, Yu. F. Kargin, D. D. Titov, M. G. Frolova, K. A. Kim, S. N. Ivicheva
Rok vydání:	2020
Předmět:	010302 applied physics Materials science General Chemical Engineering Metals and Alloys Sintering chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Hot pressing Microstructure 01 natural sciences Titanium nitride Inorganic Chemistry chemistry.chemical_compound chemistry Silicon nitride visual_art 0103 physical sciences Materials Chemistry visual_art.visual_art_medium Calcium aluminates Ceramic Composite material 0210 nano-technology Titanium
Zdroj:	Inorganic Materials. 56:309-313
ISSN:	1608-3172 0020-1685
Popis:	Si3N4–TiN ceramic composites have been produced by hot-pressing mixtures of silicon nitride and metallic titanium powders at temperatures from 1600 to 1800°C in a nitrogen atmosphere. We have examined the influence of the concentration and morphology of metallic Ti particles in the starting mixture and synthesis conditions on the microstructure, phase composition, and mechanical strength of the Si3N4–TiN ceramic composites. The results demonstrate that the sintering process ensures complete titanium nitridation, leading to the formation of a nonstoichiometric titanium nitride with the composition TiN0.9. The Si3N4–TiN composites prepared from the mixtures containing 5–30 wt % Ti have densities in the range 3.02–3.41 g/cm3, water absorption from 0.01 to 0.14%, open porosity from 0.03 to 0.44%, and bending strength from 250 to 584 MPa. The Si3N4–TiN ceramics prepared using calcium aluminates as sintering aids consist of dense intergrowths of silicon nitride crystallites, which ensures increased strength of the materials. Moreover, the samples containing 25–30 wt % TiN offer high electrical conductivity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3ec7a06ffc9398069f47990769e0870b https://doi.org/10.1134/s0020168520030115 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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