A new experimental approach to study solid combustion reactions using synchrotron radiation
We have recently utilized the high intensity characteristic of synchrotron radiation and performed a series of proof-of-principle time-resolved x-ray diffraction (TRXRD) experiments at the Brookhaven National Synchrotron Light Source to follow the phase transformations in a number of solid combustion systems in-situ at high temperature. A photo-diode array (Princeton Instrument) which is capable of recording a full scan of 1024 pixels in 4 msec, was used as a position-sensitive detector to record the TR-diffraction patterns from the reacting specimen situated in a specially designed reaction chamber-diffractometer with a vertical {theta}--2{theta} geometry. The systems thus far studied include: Ti + C = TiC; Ti + C + xNi = TiC + xNi; Al + Ni = AlNi{sub 0}. In the latter reaction, we were able to achieve a time resolution of 20 msec and record the formation of pre-reactive phases, melting of the reactants, reaction intermediates and final products in a total scan time of two minutes. These synchrotron experiments open a new route to study the chemical dynamics and phase transformation of reactive systems in-situ, at high temperature and under other external perturbations in the time domain of a few milliseconds which has not been possible before.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7002785
- Report Number(s):
- UCRL-102287; CONF-900186--1; ON: DE90009405
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-speed diffractometer-reaction chamber using synchrotron radiation
Direct observations of welding-induced solid-state phase transformations
Related Subjects
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALLOYS
BREMSSTRAHLUNG
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMBUSTION
COMBUSTION KINETICS
COMPOSITE MATERIALS
DIFFRACTION
DIFFRACTOMETERS
ELECTROMAGNETIC RADIATION
INTERMETALLIC COMPOUNDS
KINETICS
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
OXIDATION
PHASE TRANSFORMATIONS
RADIATIONS
REACTION KINETICS
SCATTERING
SYNCHROTRON RADIATION
THERMOCHEMICAL PROCESSES
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION