Fluidized-bed combustion synthesis of titanium nitride
| Autor: | Kenneth Brezinsky, Jon J. Cohen, Kyeong O. Lee |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Mechanical Engineering General Chemical Engineering Metallurgy chemistry.chemical_element Combustion Titanium nitride chemistry.chemical_compound chemistry Chemical engineering Fluidized bed Particle Fluidized bed combustion Fluidization Physical and Theoretical Chemistry Dispersion (chemistry) Titanium |
| Zdroj: | Proceedings of the Combustion Institute. 28:1373-1380 |
| ISSN: | 1540-7489 |
| DOI: | 10.1016/s0082-0784(00)80352-5 |
| Popis: | A detailed experimental study of the self-propagating high-temperature synthesis of titanium nitride was conducted to improve the conversion yield and illustrate the mechanism of formation of titanium nitride. The investigation was performed at atmospheric pressure, room temperature, and normal gravity conditions in a fluidized bed of gaseous nitrogen and solid titanium particles of approximately 50 μm. This fluidized-bed combustion system successfully produced a homogeneous dispersion of titanium particles in the nitrogen stream via a dual-syringe particle injection system, and subsequent particle ignition led to the gradual propagation of a combustion wave. From the combustion reaction, a maximum conversion yield of titanium nitride was obtained of approximately 60%. The high conversion yield was ascribed to increased introgen accessibility to the precursor particle surface by increasing the interstitial distances between particles in fluidization. The composition of the product particles was analyzed both qualitatively and quantitatively by scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), and X-ray diffraction. Based on the measurement of combustion temperature and subsequent calculation of heat transfer, a liquid mechanism is indicated for the formation of titanium nitride obtained in the combustion synthesis system. |
| Databáze: | OpenAIRE |
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