Preparation of TiAl/Al2O3 composites by combustion synthesis

Studies the combustion synthesis of A1-Ti-TiO2 system and concludes that,due to its low exothermic nature,a stable combustion wave can be maintained only when the system is ignited at a certain preheating temperature,and coupled with appropriate pseudo-HIP process,dense TiAI/A12 O3 composites with density as high as 97% of the theoretical value can be produced,and points out.Microstructure observation shows in situ formed A12 O3 particles are of an average size smaller than one micron,and the hardness of TiAI matrix is enhanced by introduction of these particles.