Thermal analysis of self-propagating high-temperature reactions in titanium, boron, and aluminum powder compacts

摘要

This article focuses on the characterization of self-propagating high-temperature synthesis (SHS) reactions that occurin powder compacts containing titanium, boron, andaluminum. Interest in this powder system is basedon the critical need to develop new joiningtechniques for bonding ceramics to metals. Theexothermic reactions of particular interest inthis study include those that generate TiB2, TiB,Ti3Al, and TiAl from their elemental powders. Datafrom differential thermal analysis (DTA),thermogravimetric analysis (TGA), and X-raydiffractometry are presented. These resultsdemonstrate that the gas phase surrounding the SHSpowders plays an important role in initiating theSHS reaction and in determining which reactionproducts will form in the final bond.