Synthesis of High Pure Ti_3AlC_2 and Ti_2AlC Powders from TiH_2 Powders as Ti Source by Tube Furnace

• 作 者: 李良 周爱国 XU Lin LI Zhengyang WANG Libo
• 机 构: School of Materials Science and Engineering,Henan Polytechnic University,
• 出 处: Journal of Wuhan University of Technology(Materials Science
• 发表日期: 2004年期
• 关键词: powders additives purity starting carbide instead sintering porous graphite prel

Titanium aluminum carbide(Ti3AlC2 and Ti2AlC) powders were synthesized from TiH2 powders instead of Ti powders as Ti source by a tube furnace under argon atmosphere without preliminary dehydrogenation.95 wt% pure Ti3AlC2 powders were synthesized from TiH 2/1.1Al/2TiC at 1 450 ℃ for 120 min.High-purity Ti2AlC powders were also prepared from 3TiH2/1.5Al/C and 2TiH2/1.5Al/TiC powders at 1 400 ℃ for 120 min.The as-synthesized samples were porous and easy to be ground into powders.Sn or Si additives in starting materials increased the purity of synthesized Ti 3 AlC 2 obviously and expanded the temperature range for the synthesis of Ti3AlC2.With Si or Sn as additives,high pure Ti3AlC2 was synthesized at 1 200 ℃ for 60 min from TiH/x Si/Al/2TiC and TiH/x Sn/Al/2TiC(x=0.1,0.2),respectively.

Titanium aluminum carbide (Ti3AlC2 and Ti2AlC) powders were synthesized from TiH2 powders instead of Ti powders as Ti source by a tube furnace under argon atmosphere without preliminary dehydrogenation.95 wt% pure Ti3AlC2 powders were synthesized from TiH 2 / 1.1Al / 2TiC at 1 450 ° C for 120 min. High-purity Ti2AlC powders were also prepared from 3TiH2 / 1.5Al / C and 2TiH2 / 1.5Al / TiC powders at 1 400 ° C for 120 min. The as-synthesized samples were porous and easy to be ground into powders.Sn or Si additives in starting materials increased the purity of Ti 3 AlC 2 obviously and expanded the temperature range for the synthesis of Ti 3 AlC 2 .With Si or Sn as additives, high pure Ti 3 AlC 2 was synthesized at 1 200 ° C for 60 min from TiH / x Si / Al / 2TiC and TiH / x Sn / Al / 2TiC (x = 0.1, 0.2), respectively.