Ignition temperatures for Cu-Al and Ni-Al reactions in elemental powder mixtures using Differential Scanning Calorimetry

摘要

The formation of intermetallic compounds in Cu-Al and Ni-Al systems has been studied in this work. Metal powders were mixed in stoichiometric amounts corresponding to CuAl_2 and NiAl. Pre-compacted as well as uncompacted metal powder mixtures were studied using simultaneous thermal analysis and thermogravimetry, with a protective atmosphere of flowing argon gas. Initiation and ignition temperatures for the reactions have been determined below the melting point of aluminium, at heating rates of 7.5° and 15°C per minute. The effect of parameters like particle size and compaction pressure on ignition temperature is presented. X-ray diffraction data on samples from ex situ studies confirm the presence of intermetallic compounds.