Influence of process parameters on the characteristics of TiAl alloyed powders by fluidized bed jet milling

Xin Lu, Cheng cheng Liu, Lang ping Zhu, Xuan hui Qu

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Micro-fine high Nb containing TiAl alloyed powders were prepared by using fluidized bed jet milling from the pre-crushed Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y(at.%) ingot. The effects of process parameters on the powder characteristics were investigated. The results show that the particle characteristics are mainly determined by classifier frequency. At or above 5600. rpm, the ground powders are composed of coarse block-shaped particles and finer flaky debris, with particle number-average diameter lower than 18. μm. With the increase of classifier frequency and the decrease of grinding gas pressure, the amount of flaky debris formed under abrasion mechanism gradually increases, which causes the obvious decrease of the powder number-average diameter, distribution uniformity, and sphericity degree. With the classifier frequency of 8400. rpm and grinding gas pressure of 0.55. MPa, the obtained powders possess the minimum particle size of 5.32. μm, with a uniformity level of 0.38 and a Wadell's sphericity factor of 0.820.

Original languageEnglish
Pages (from-to)235-240
Number of pages6
JournalPowder Technology
Volume254
DOIs
Publication statusPublished - 2014 Mar 1
Externally publishedYes

Keywords

  • Breakage mechanism
  • Fluidized bed jet milling
  • High Nb containing TiAl alloys
  • Powder characteristics
  • Powder preparation
  • Process parameters

ASJC Scopus subject areas

  • Chemical Engineering(all)

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