Gas-phase combustion synthesis of titanium boride (TiB2) nanocrystallites

Autor:	Richard L. Axelbaum, L.J. Rosen, S. A. Lawton, Douglas P. Dufaux, Claire A. Frey, S.M.L. Sastry, Kenneth F. Kelton
Rok vydání:	1996
Předmět:	Materials science Annealing (metallurgy) Mechanical Engineering Sodium Metallurgy chemistry.chemical_element Condensed Matter Physics Combustion Chemical reaction chemistry Chemical engineering Mechanics of Materials Agglomerate Combustor General Materials Science Particle size Thermal analysis
Zdroj:	Journal of Materials Research. 11:948-954
ISSN:	2044-5326 0884-2914
Popis:	Two techniques are described for synthesizing nanometer-sized TiB2 particles by gas-phase combustion reactions of sodium vapor with TiCl4 and BCl3: a low-pressure, low-temperature burner and a high-temperature flow reactor. Both methods produce TiB2 particles that are less than 15 nm in diameter. The combustion by-product, NaCl, is efficiently removed from the TiB2 by water washing or vacuum sublimation. Material collected from the low-temperature burner and annealed at 1000 °C consists of loosely agglomerated particles 20 to 100 nm in size. Washed material from the high-temperature flow reactor consists of necked agglomerates of 3 to 15 nm particles. A thermodynamic analysis of the Ti/B/Cl/Na system indicates that near 100% yields of TiB2 are possible with appropriate reactant concentrations, pressures, and temperatures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f23b65248beee9410e1100bbb1a04752 https://doi.org/10.1557/jmr.1996.0119 Zobrazit plný text záznamu Full text from SpringerLink