Abstract
Ti-6Al-4V alloy powder was prepared through a two-step reduction of a mixture of TiO2, V2O5 and Al2O3 in this study. The oxide mixture was first reduced by Mg in MgCl2 at 750 °C in argon, where oxygen was reduced to 2.47 wt% from 40.02 wt%. The oxygen content in the final powder was eventually reduced to an extremely low level (0.055 wt%) using calcium at 900 °C in argon, and the final powder had the composition of 90.12 wt% Ti, 5.57 wt% Al, and 3.87 wt% V, which meets the standard specification of Ti-6Al-4V (ASTM F1108-09). Between the two reductions, a heat treatment step was designed to help controlling the specific surface area and particle size. The effect of the heat treatment temperature on the morphology, and composition uniformity of the powder was investigated in detail. Heat treatment above 1300 °C attributed to a dense powder with a controlled specific surface area. Thermodynamic modeling and experimental results indicated that only α-Ti enriched with Al and β-Ti enriched with V exist in the final powder, and other possible phases including Al-Mg and Al-V were excluded. This study also offers a triple-step thermochemical process for producing high-purity Ti-based alloy powder.
摘要
通过两步还原金属氧化物制备低氧Ti-6Al-4V 合金粉末。第一步利用镁粉做还原剂,在750 °C下使氧化物中的氧含量从40.02% 降低至2.47%;第二步利用钙粒做脱氧剂在900 °C 使粉末中的氧含量降低至0.055%。产物中Ti、Al、V 元素的含量分别为90.12%,5.57% 和3.87%。在还原脱氧过程中引入热处理步骤,减小比表面积和孔隙率对氧含量的影响。探究了热处理温度对粉末孔隙率的影响。实验表明,1300 °C 的热处理温度可以使钛铝合金粉末实现致密。热力学计算和实验结果均表明,合金粉末产物中的物相为α-Ti(含Al 元素)和β-Ti(含V 元素),未形成Al-Mg 和Al-V 合金相。该方法为制备低氧钛合金粉末提供一种新思路。
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Project(52004342) supported by the National Natural Science Foundation of China; Project(150240015) supported by the Innovation-Driven Project of Central South University, China; Project(2021JJ20065) supported by the Natural Science Fund for Outstanding Young Scholar of Hunan Province, China
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DONG Zhao-wang: Data curation, writing-original draft, writing-review & editing. XIA Yang: Funding acquisition, investigation, methodology, project administration. GUO Xue-yi: Supervision, validation, visualization. LIU Han-ning: Drawing. LIU Pei-dong: Data curation. All authors replied to reviewers’ comments and revised the final version.
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Dong, Zw., Xia, Y., Guo, Xy. et al. Preparing low-oxygen Ti-6Al-4V alloy powder through direct reduction of oxides and its synergistic reaction mechanism. J. Cent. South Univ. 29, 1811–1822 (2022). https://doi.org/10.1007/s11771-022-5054-1
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DOI: https://doi.org/10.1007/s11771-022-5054-1