Formation of Ti2AlC0.5N0.5 solid solutions by combustion synthesis of Al4C3-containing samples in nitrogen

摘要: Abstract Preparation of the solid solution Ti 2 AlC 0.5 N from powder compacts composed Ti, Al 4 C 3 , and or AlN was investigated by self-propagating high-temperature synthesis (SHS) under gaseous nitrogen. The molar proportion three reactant powders formulated as Ti:Al :Al (or AlN) = 2:1/6:1/3. For both types samples, increase nitrogen pressure 0.45 to 1.82 MPa augments combustion temperature thus accelerates reaction front. In contrast inertness AlN, particles reacted energetically with during SHS process, which resulted in higher exothermicity for sample containing than that adopting AlN. identified dominant phase final products Ti–Al –Al compacts. However, adversely affected evolution because over-nitrified also When used replace compacts, formation deteriorated due weak deficiency TiAl. addition, synthesized –AlN samples 1.48 were dominated titanium carbonitride Ti(C,N). This implies use place is unfavorable through involving