Characterization of vapors evolved during high-temperature syntheses [electronic resource].
- Houston, Tex. : Rice University, 1985.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 13 : digital, PDF file
- Additional Creators:
- Rice University and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Self-propagating high-temperature combustion syntheses (SHS) involve direct reaction between condensed phase reagents. The complexity of the reaction mechanism may be increased, however, by the occurrence of solid-vapor or appreciable gas-phase side reactions. Under certain conditions of pressure and reaction temperature these gas phase reactions may play an important role in the overall mechanism of the SHS reaction. Assays of typical starting reagents show the presence of a number of impurities having wide ranges of concentrations. These impurities include condensed-phase metals and non-metals as well as dissolved gases. The major question concerning these impurities is the degree to which they are involved in the overall reaction mechanism. It is believed that certain impurities form volatile products at the reaction temperature and are removed by vaporization. The goal of this work is to obtain a fundamental understanding of the interplay between impurity removal by volatilization and the SHS combustion process. Questions we wish to address in this work include: (1) what chemical processes are occurring in the gas phase above the SHS reaction mixture during pre-ignition warm-up, at ignition, and during combustion, and (2) what specific roles might certain impurities play in the SHS reaction mechanism. Answers to these questions are being sought via studies of the vapor species evolved from Ti + C reaction mixtures heated with laser radiation. Three separate but complementary methods have been employed to study the solid-vapor equilibria in the Ti + C + Impurities system. These methods are thermochemical modeling, time-resolved quadrupole mass spectrometry, and optical multichannel analysis. 2 refs., 6 figs.
- Report Numbers:
- E 1.99:la-ur-86-382
E 1.99: conf-8510280-4
- Other Subject(s):
- Volatile Matter
- Emission Spectroscopy
- Gas Analysis
- Mass Spectroscopy
- Multi-Channel Analyzers
- Temperature Dependence
- Chemical Reactions
- Electronic Equipment
- Pulse Analyzers
- Thermochemical Processes
- Transition Elements
- Published through SciTech Connect.
DARPA/ARMY symposium, Daytona Beach, FL, USA, 21 Oct 1985.
Hansen, G.P.; Behrens, R.G.; Margrave, J.L.; Fredin, L.
- Funding Information:
View MARC record | catkey: 14397061