Formation of Ti ₂ AlN by Solid–Gas Combustion Synthesis with AlN‐ and TiN‐Diluted Samples in Nitrogen

Abstract

Ti 2 AlN was prepared by a self‐propagating high‐temperature synthesis (SHS) in nitrogen at 0.45 and 0.79 MPa. TiN and AlN were adopted as diluents in the Ti–Al powder compacts and their contents varied from 8.3 to 25 mol%. Formation of Ti 2 AlN along with intermediates like TiN, Ti 3 Al, and TiAl was identified. For the AlN‐added samples, the degree of dilution at 11.7 mol% brought about the optimum formation up to 81.8% Ti 2 AlN in nitrogen of 0.79 MPa. When the sample was diluted with 20 mol% TiN, the SHS process yielded the highest percentage of Ti 2 AlN reaching 84.3% in nitrogen of 0.45 MPa.