Fabrication of micro-fine high Nb-containing TiAl alloyed powders by fluidized bed jet milling
Fabrication of micro-fine high Nb-containing TiAl alloyed powders by fluidized bed jet milling
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DOI：
10.1007/s12598-012-0451-5
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发表时间：
2012-01
期刊：
影响因子：
8.8
通讯作者：
Xin Lu;Lang-ping Zhu;Cheng-cheng Liu;Lin Zhang;Mao Wu;X. Qu
中科院分区：
文献类型：
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作者：
Xin Lu;Lang-ping Zhu;Cheng-cheng Liu;Lin Zhang;Mao Wu;X. Qu
以Ti-45Al-8.5Nb-(W，B，Y)钢锭粉碎后的碎屑为原料，采用流态化气流粉碎法制备了超细高Nb TiAl合金化粉末。考察了分级频率对粉料特性的影响。结果表明，可以规模化地制备平均粒径可控的粉末。不同粒度的粉末均以γ为主，并含有少量的α_2-Ti3Al。随着分级器频率的增加，颗粒大小明显减小。在分级机频率高于38 Hz时，粉料的平均粒度小于25μm，由两种不同粒度的颗粒组成：定形颗粒和碎屑颗粒，两种颗粒的粒度均符合对数正态分布。随着分级机频率的增加，两种粒度均减小，碎屑颗粒所占比例逐渐增大，磨细粉的粒度分布跨度值也相应增大。
A fluidized bed jet milling process was used to make micro-fine high Nb-containing TiAl alloyed powders from the chippings obtained by crushing the Ti-45Al-8.5Nb-(W,B,Y) ingot. The influences of classifier frequency on powder characteristics were investigated. The results show that the powders with controlled average particle size can be prepared on a large scale. The powders with different sizes are all dominated by γ with a minor amount of α2-Ti3Al. The particle size significantly decreases with the classifier frequency increasing. At a classifier frequency higher than 38 Hz, the average particle size of the ground powders is lower than 25 μm. The powders are composed of two different sizes of particles: shaped particles and some clastic particles, and both particle sizes meet the log-normal distribution. With the classifier frequency increasing, the both sizes decrease; meanwhile, the proportion of the clastic particles gradually increases, and the size distribution span value of the ground powders increases correspondingly.