Direct production of TiH2 powder with 0.21 mass%O from TiO2 using magnesiothermic reduction in high hydrogen chemical potential

IF 9.2 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies Pub Date : 2025-07-23 DOI:10.1016/j.susmat.2025.e01540

Youngju Song , Sung-Hun Park , Jungshin Kang

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Abstract

In recent years, reduction followed by deoxidation using magnesium (Mg) in a hydrogen gas (H₂) atmosphere has been suggested as a method to produce titanium (Ti) metal with a low oxygen (O) concentration from titanium dioxide (TiO₂). In this study, a single-step magnesiothermic reduction of TiO₂ in an H₂ mixed gas atmosphere was developed to produce Ti with a low O concentration. In the experiments, the reduction of sintered/unsintered TiO₂ with particle size below 300 μm in molten magnesium chloride (MgCl₂) – potassium chloride (KCl) was conducted at 973 K for 12–48 h in an argon (Ar) – 10 % H₂ gas atmosphere. The influences of microstructure and particle size of TiO₂, the ratio of salt to TiO₂ feed, and reduction time on the O concentration and phases of the obtained residues were investigated. Under certain conditions, TiH₂ powder with 0.209 mass%O was directly produced from TiO₂ powder consisting of micron-scale secondary structures (45–75 μm) formed by the agglomeration of nanosized primary particles. The results of this study demonstrate the feasibility of the suggested single-step magnesiothermic reduction of TiO₂ in high hydrogen chemical potential to produce Ti with a low O concentration.

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用镁热还原法在高氢化学势条件下直接制备质量分数为0.21 %O的TiH2粉体

近年来，人们提出用镁（Mg）在氢气（H2）气氛中还原后脱氧的方法，以二氧化钛（TiO2）为原料制备低氧(O)浓度的金属钛（Ti）。在本研究中，开发了在H2混合气体气氛中一步镁热还原TiO2的方法，以生产低O浓度的Ti。在氩气(Ar) - 10% H2气氛中，在973 K温度下还原了粒径小于300 μm的烧结/未烧结TiO2，还原时间为12 ~ 48 h。考察了TiO2的微观结构和粒径、盐料比、还原时间对所得残渣O浓度和物相的影响。在一定条件下，由纳米级初级颗粒团聚形成的微米级二级结构（45 ~ 75 μm）组成的TiO2粉末可直接制得质量为0.209 %O的TiH2粉末。本研究的结果证明了在高氢化学势下对TiO2进行单步镁热还原制备低氧浓度Ti的可行性。

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来源期刊

Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment

CiteScore

13.40

自引率

4.20%

发文量

158

审稿时长

45 days

期刊介绍： Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.