Densieication of nonstoichiometric titanium carbide during sintering

Autor:	S. S. Ordan'yan, L. V. Kozlovskii, G. S. Tabatadze
Rok vydání:	1979
Předmět:	Materials science Titanium carbide Metallurgy Metals and Alloys Sintering Thermodynamics Condensed Matter Physics Microstructure Grain size Carbide chemistry.chemical_compound chemistry Mechanics of Materials Phase (matter) Materials Chemistry Ceramics and Composites Relative density Stoichiometry
Zdroj:	Soviet Powder Metallurgy and Metal Ceramics. 18:458-461
ISSN:	1573-9066 0038-5735
Popis:	1. The relative density of sintered nonstoichiometric TiCx phases grows, at any given specific surface and sintering temperature, with increasing deviation from stoichiometry. Comparison with calculated effective coefficients of self-diffusion has established that, at any given temperature, Deff increases with growth of C-vacancies, which is evidence that mass transport in the sintering of carbon-deficient TiCx phases involves a steadily growing diffusional mobility of their components. 2. At equal values of Deff the relative density of a carbide of any given composition increases with increasing powder dispersion, thereby reflecting the role of growing capillary forces. 3. As in the case of NbCx phases, equal relative densities in more carbon-deficient TiCx phases are attainable at larger coefficients Deff, which is due to hindered operation of threshold mechanisms of mass transport in deficient TiCx phases. 4. The microstructure of alloys obtained from TiCx phase powders synthesized by the SHS method is characterized by an appreciable grain size nonuniformity; with increasing deviation from stoichiometry the mean grain size grows.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::85b2d6cc0bea90abfcb8082287e86b56 https://doi.org/10.1007/bf00797248 Zobrazit plný text záznamu Full text from SpringerLink