Preparation of Molybdenum–Tungsten Alloy Powders via Magnesium and Calcium Vapor Reduction of Oxide Compounds

IF 0.9 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Inorganic Materials Pub Date : 2024-03-07 DOI:10.1134/S0020168523090078

V. N. Kolosov, M. N. Miroshnichenko, T. Yu. Prokhorova

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Abstract

We report the preparation of molybdenum–tungsten alloy powders via magnesium and calcium vapor reduction of the Mo_0.3W_0.7O₃, MgМо_0.7W_0.3O₄, and CaМо_0.7W_0.3O₄ compounds in the temperature range 750–880°C at residual pressures in the reactor from 5 to 15 kPa. The specific surface area of the Mo–W alloy powders prepared by reducing Mo_0.3W_0.7O₃ slightly exceeds that of the mixture of metal powders obtained by reducing a mixture of WO₃ and MoO₃ under similar conditions. The specific surface area of the Mo–W alloy powders prepared via magnesium vapor reduction of the CaМо_0.7W_0.3O₄ and MgМо_0.7W_0.3O₄ compounds exceeds that in the case of calcium vapor reduction. We have obtained molybdenum–tungsten alloy powders having lattice parameters of 0.3153 ± 0.0001 and 0.3160 ± 0.0001 nm and ranging in specific surface area from 9 to 22 m²/g. The average crystallite size of the alloys, evaluated using the Scherrer formula, lies in the range 12–35 nm. The powders have a mesoporous structure.

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通过氧化化合物的镁和钙气相还原制备钼钨合金粉末

摘要--我们报告了通过镁和钙气相还原 Mo0.3W0.7O3、MgМо0.7W0.3O4 和 CaМо0.7W0.3O4，在 750-880°C 的温度范围内，在反应器残压 5-15 kPa 的条件下制备钼钨合金粉末的情况。还原 Mo0.3W0.7O3 制备的 Mo-W 合金粉末的比表面积略高于在类似条件下还原 WO3 和 MoO3 混合物制备的金属粉末混合物的比表面积。通过镁蒸气还原 CaМо0.7W0.3O4 和 MgМо0.7W0.3O4 化合物制备的 Mo-W 合金粉末的比表面积超过了钙蒸气还原的情况。我们获得的钼钨合金粉末的晶格参数分别为 0.3153 ± 0.0001 和 0.3160 ± 0.0001 nm，比表面积从 9 到 22 m2/g 不等。根据舍勒公式评估，合金的平均晶粒大小在 12-35 纳米之间。这些粉末具有介孔结构。

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来源期刊

Inorganic Materials 工程技术-材料科学：综合

CiteScore

1.40

自引率

25.00%

发文量

审稿时长

3-6 weeks

期刊介绍： Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.