The effects of ball milling and the addition of blended elemental aluminium on the densification of TiH2 power
The effects of ball milling and the addition of blended elemental aluminium on the densification of TiH2 power
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DOI：
10.1016/j.matchemphys.2016.01.045
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发表时间：
2016-04-15
影响因子：
4.6
通讯作者：
Lamirand-Majimel, M.
中科院分区：
文献类型：
--
作者：
Schumann, E.;Silvain, J. -F.;Lamirand-Majimel, M.
为了降低钛零件的制造成本，对钛粉末冶金粉末的生产和烧结工艺进行了研究。 TiH2 的直接烧结简化了粉末加工并有助于烧结过程中的致密化。球磨的效果已被证明可以改善 TiH2 的脱氢，在烧结过程中，导致固体钛颗粒周围的氧化物层较早溶解，从而使固体扩散较早发生。本文研究了烧结过程中球磨 TiH2 颗粒尺寸减小和脱氢增加的综合效应，以了解它们在致密化过程中的作用。将经过不同时间球磨的 TiH2 在 700-900 摄氏度下真空热压烧结。还研究了所制造的钛样品的密度、微观结构和硬度。与商业钛粉相比，研究了球磨粉末对混合元素铝引入的影响。增加 TiH2 粉末的球磨时间以减小颗粒尺寸，导致更快的致密化和脱氢，并具有更精细、均匀的微观结构。当将细球磨粉末与铝一起使用时，通过钛和液态铝的相互作用形成的克肯德尔孔会恶化。 (C) 2016 Elsevier B.V. 保留所有权利。
Powder production and sintering processes of titanium powder metallurgy are studied in order to reduce the cost of manufacturing titanium parts. The direct sintering of TiH2 simplifies powder processing and helps densification during sintering. The effects of ball milling have been shown to improve the dehydrogenation of TiH2, which during sintering, causes the earlier dissolution of the oxide layer surrounding the solid titanium particles, allowing solid diffusion to occur earlier. The combined effect of reduced particle size and increased dehydrogenation of ball milled TiH2 are studied here during sintering, in order to understand their roles during densification. TiH2 ball milled for various durations is vacuum hot press sintered at 700-900 degrees C. The density, microstructure and hardness of the fabricated titanium specimens are also studied. The effects of ball milled powder on the introduction of blended elemental aluminium are studied in comparison with a commercial titanium powder. The increase in ball milling duration of TiH2 powders to reduce particle size causes faster densification and dehydrogenation, with a finer uniform microstructure. When using fine ball milled powder with aluminium, the formation of Kir-kendall pores through the interaction of titanium and liquid aluminium is worsened. (C) 2016 Elsevier B.V. All rights reserved.