A ternary-layered carbide Ti2AlC material could be synthesized by spark plasma sintering（SPS） technology using elemental powder mixture of Ti, Al and active carbon. By means of XRD and SEM, phases were identified an...A ternary-layered carbide Ti2AlC material could be synthesized by spark plasma sintering（SPS） technology using elemental powder mixture of Ti, Al and active carbon. By means of XRD and SEM, phases were identified and microscopically evaluated. The experimental results show that the main phase in the product was fully crystallized Ti2AlC with small particle size when sintered at 1200℃. The synthesis temperature of SPS was 200-400℃ lower than that of hot pressing （HP） or hot isostatic pressing （HIP）. Through thermodynamics calculations, the mechanism of Ti2AlC was studied by calculating changes of Gibbs free energy of reactions.展开更多
A simple method to synthesize high-content ternary carbide Ti3AlC2 nanoparticles from Ti,Al,and C starting elemental powders without ball milling in NaCl–KCl molten salt was reported.The effects of mass ratio of the ...A simple method to synthesize high-content ternary carbide Ti3AlC2 nanoparticles from Ti,Al,and C starting elemental powders without ball milling in NaCl–KCl molten salt was reported.The effects of mass ratio of the salt to starting materials,temperature,reaction time,and Al molar ratio on preparation of Ti3AlC2 were investigated.The Ti3AlC2 formation is dramatically influenced by temperature and mass ratio of the salt to raw materials:a higher temperature and higher mass ratio of the salt to raw materials are more preferable for Ti3AlC2 powder formation.Homogenous Ti3AlC2 powder with particle size of■nm is synthesized by 3Ti/Al/2C starting elemental powders in NaCl–KCl molten salt at 900℃for 10 h,950℃for 5h,or 1000℃for 2h,respectively,when the mass ratio of the salt to 3Ti/Al/2C starting materials is 10:1.展开更多
基金the National Natural Science Foundation of China (No.50572080)
文摘A ternary-layered carbide Ti2AlC material could be synthesized by spark plasma sintering（SPS） technology using elemental powder mixture of Ti, Al and active carbon. By means of XRD and SEM, phases were identified and microscopically evaluated. The experimental results show that the main phase in the product was fully crystallized Ti2AlC with small particle size when sintered at 1200℃. The synthesis temperature of SPS was 200-400℃ lower than that of hot pressing （HP） or hot isostatic pressing （HIP）. Through thermodynamics calculations, the mechanism of Ti2AlC was studied by calculating changes of Gibbs free energy of reactions.
基金supported financially by the National Natural Science Foundation of China(No.51501205).
文摘A simple method to synthesize high-content ternary carbide Ti3AlC2 nanoparticles from Ti,Al,and C starting elemental powders without ball milling in NaCl–KCl molten salt was reported.The effects of mass ratio of the salt to starting materials,temperature,reaction time,and Al molar ratio on preparation of Ti3AlC2 were investigated.The Ti3AlC2 formation is dramatically influenced by temperature and mass ratio of the salt to raw materials:a higher temperature and higher mass ratio of the salt to raw materials are more preferable for Ti3AlC2 powder formation.Homogenous Ti3AlC2 powder with particle size of■nm is synthesized by 3Ti/Al/2C starting elemental powders in NaCl–KCl molten salt at 900℃for 10 h,950℃for 5h,or 1000℃for 2h,respectively,when the mass ratio of the salt to 3Ti/Al/2C starting materials is 10:1.
