Effect of Sample Preparation Pressure on Transformation Law of Low-Valent Titanium Oxide in a Multi-Stage Reduction Process
| Autor: | Ting’an Zhang, Zhihe Dou, Fan Shigang, Ji-sen Yan, Li-ping Niu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science low-valent titanium oxide Diffusion chemistry.chemical_element 02 engineering and technology Combustion 01 natural sciences Chemical reaction 0103 physical sciences primary reduction Relative density General Materials Science Sample preparation lcsh:Mining engineering. Metallurgy 010302 applied physics thermal fluid multi-stage reduction technology industry and agriculture Metals and Alloys 021001 nanoscience & nanotechnology Titanium oxide Titanium powder chemistry Chemical engineering 0210 nano-technology Titanium |
| Zdroj: | Metals, Vol 10, Iss 1259, p 1259 (2020) Metals Volume 10 Issue 9 |
| ISSN: | 2075-4701 |
| Popis: | A novel method for preparing titanium powder by multi-stage reduction of TiO2 was proposed. Its core is the preparation of high-quality low-valent titanium oxide. In this paper, the effect mechanism of different sample preparation pressures on the preparation of low-valent titanium oxide by the primary reduction (self-propagating high-temperature synthesis mode, SHS) of the Mg-TiO2 system was studied. The results show that the generation of Mg thermal fluid is the key link of the self-sustaining chemical reaction of the Mg-TiO2 system. Titanium exists in&alpha Ti and TiO at the end of combustion, and constitutes a non-stoichiometric low-valent titanium oxide. The sample preparation pressure determines the proportion of pores reserved for Mg diffusion in the compacts and the contact area of the reactants, thereby determining the partitioning behavior and heat transfer effect of Mg thermal fluid during the combustion process. When the sample preparation pressure is 75 MPa (relative density is 0.66 ± 0.01), the combustion effect is optimal, and the low-valent titanium oxide with oxygen content of 15.1% can be obtained. It was subjected to deep reduction to obtain a titanium powder product with an oxygen content of 0.27%. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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