Study On Microstructure And Properties Of TIN_x Sintered With The Second Phase

In the field of advanced ceramic materials combined with covalent bond compoundceramic is a very important high temperature structural ceramics. Lattice defects existingin the covalent bond compound is less, the strength of the covalent bond than hydrogenbonding is strong, show a high melting point and hardness, so its high temperatureresistance, corrosion resistance and other excellent performance. But at the same time, theatomic diffusion ability is weak, these materials also exist poor toughness and hard tosintering. In this research, by using the method of multiphase composite mixed sintering toreduce the effect of the powder sintering temperature, and inhibit the grain growth and toimprove the performance of sintered body material.This study using the method of mechanical alloying in the preparation of thestoichiometric ratio TiNx researches the sintering behavior with TaC and Al, studied theTiN0.3and TaC layer and the spread of the sintering interface. The results show that thesintering interface of TaC and TiN0.3, there are atomic diffusion area. Ti, C, N atomdiffusion phenomenon is more obvious, the atomic diffusion Ta obviously affected by theatomic radius and slightly weak.TiN0.3and TaC at different sintering temperature, the ratio of different materials anddifferent composite sintering holding time conditions, of sintered samples by XRD,hardness and fracture toughness test, SEM and EDS experiment, the samples of phasecomposition analysis, mechanical properties and microstructure morphology, finally it isconcluded that, In the sintering temperature is1500℃, pressure sintering of40MPa, timeof heat preservation for15min, add30vol.%TaC to obtain samples of the comprehensiveperformance is more outstanding.TiNx and Al according to different ratio mixed sintering, under different conditions,can generate reaction TiAl3, Ti2AlN, Ti4AlN3and AlN and other compounds.