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 ...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 TiH2/1.IAl/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 Ti3AlC2 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 TiH2/x Si/Al/2TiC and TiH2/x Sn/Al/2TiC （x = 0.1, 0.2）, respectively.展开更多
Through a survey of learning styles and their learning achievements among non-English majors in Shandong Jianzhu University, this paper analyzes the relationships between the two variables. Data are collected and anal...Through a survey of learning styles and their learning achievements among non-English majors in Shandong Jianzhu University, this paper analyzes the relationships between the two variables. Data are collected and analyzed by means of SPSS.Statistical analysis indicates that no significant difference exists between FI （Field Independent） students＇ achievements measured by the test and FD （Field Dependent） students＇.展开更多
基金Funded by National Natural Science Foundation of China(Nos.51002045,51205111)Program for Innovative Research Team(in Science and Technology)in the University of Henan Province(No.2012IRTSTHN007),IRTHPU(No.T2013-4)Opening Project of Henan Key Discipline Open Laboratory of Mining Engineering Materials(No.MEM12-5)
文摘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 TiH2/1.IAl/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 Ti3AlC2 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 TiH2/x Si/Al/2TiC and TiH2/x Sn/Al/2TiC （x = 0.1, 0.2）, respectively.
文摘Through a survey of learning styles and their learning achievements among non-English majors in Shandong Jianzhu University, this paper analyzes the relationships between the two variables. Data are collected and analyzed by means of SPSS.Statistical analysis indicates that no significant difference exists between FI （Field Independent） students＇ achievements measured by the test and FD （Field Dependent） students＇.
