Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-403 - C7-410
DOI http://dx.doi.org/10.1051/jp4:1993763
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-403-C7-410

DOI: 10.1051/jp4:1993763

Gas formation during reaction sintering of titanium aluminides

G. LEITNER and K. JAENICKE-RÖSSLER

Fraunhofer Institution for Ceramic Technologies and Sintering Materials, IKTS Dresden, Germany


Abstract
Titanium aluminides are attractive materials not only for aviation and space research but also for application in automotive engines. Reaction sintering of titanium aluminides involves considerable swelling during phase formation ; the reason for this effect has not been understood until now. A strong increase of porosity is connected with this swelling of the samples, which must be avoided by using expensive HIP techniques. The influence of gas reactions on the swelling is investigated by mass-spectrometric analysis of the gases produced during reaction sintering. By means of simultaneous measurements of mass change (thermobalance), enthalpy change (DTA) and gas production (quadrupole mass-spectrometer) in dependence on temperature significant information on the course of the reaction sintering process is found. Espescially it is possible to determine the generation of hydrogen and gaseous water during the heating process and to correlate them to the swelling effects. From these results conclusions may be drawn for an optimization of the sintering parameters during reaction sintering of titanium aluminides.



© EDP Sciences 1993