Combustion synthesis of TiNi intermetallic compounds
- Univ. of Calgary, Alberta (Canada). Dept. of Mechanical Engineering
The technique, self-propagating high temperature synthesis (SHS) was used to produce TiNi intermetallic compounds. The reactants in the form of a compacted powder pellet were ignited in a thermal explosion mode. Microstructural observations of SHS-reacted pellets established that the combustion in air, argon or vacuum of a stoichiometric mixture of Ti and Ni powders resulted mainly in the TiNi parent phase. Some phase disparities occurred when the synthesis was carried out in air, particularly in the vicinity of the surface of the pellet. As a result of the preferential formation of TiO{sub 2} near the surface, it was observed that an intermediate product region was composed of the eutectic structure of TiNi + TiNi{sub 3}. It was observed that the ignition temperature in air was lower than that recorded for the argon and vacuum atmospheres. Through microstructural analysis it is concluded that this can be attributed to the formation of TiO{sub 2} on the surface of the pellet. This oxidation, exothermic in nature, stimulated the Ti + Ni reaction. Application is for hydrogen storage and transport applications.
- OSTI ID:
- 376330
- Report Number(s):
- CONF-960154--; ISBN 0-9648731-8-4
- Country of Publication:
- United States
- Language:
- English
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