Facile synthesis of fine Ti-Al intermetallic compound powders via sodiothermic reduction in molten CaCl2
Facile synthesis of fine Ti-Al intermetallic compound powders via sodiothermic reduction in molten CaCl2
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DOI：
10.1016/j.intermet.2020.107038
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发表时间：
2021-02-01
期刊：
影响因子：
4.4
通讯作者：
Zhu, Hongmin
中科院分区：
文献类型：
--
作者：
Du, Chao;Xiao, Jiusan;Zhu, Hongmin
以TiO 2/Al 2 O3复合材料为原料，在CaCl 2熔融体系中，采用钠热还原法直接合成了Ti-Al金属间化合物钛铝化合物。采用均匀球磨的TiO_2/Al_2 O_3复合材料，在所有产物粉末的严格单相中成功地合成了所有类型的钛铝化合物（Ti_3Al，TiAl和TiAl_3）。该方法制备的Ti-Al合金粉末成分在二元体系所需范围内可调，且各颗粒成分均匀。产物粉末的平均粒度在几百纳米的范围内。产物粉末中氧含量与其比表面积成正比，在1373 K下反应72 h后，氧含量降至1500 ppm以下。
Fine powders of titanium aluminides, the Ti-Al intermetallic compounds were directly synthesized via sodiothermic reduction of TiO2/Al2O3 composites in molten CaCl2. By using uniformly ball milled TiO2/Al2O3 composites, all types of titanium aluminides (Ti3Al, TiAl and TiAl3) were successfully synthesized in strictly single phase of the all product powders. Through this synthesis method, the composition of Ti-Al alloy powders is tunable in the entail range of the binary system, and the all composition is uniformed in the all particles. The average particle size of the product powders was in the range of some hundreds of nanometers. The oxygen content in the product powders was proportional to its specific surface area, and was reduced down to less than 1500 ppm when reacted at 1373 K for 72 h.