一种小粒径的纳米W-Re-Y2O3合金粉末及其 制备方法

本发明涉及一种小粒径的纳米W‑Re‑Y2O3合金粉末及其制备方法，所述小粒径的纳米W‑Re‑Y 2 O 3合金粉末，按照质量百分比计，包括79～94wt .％W、10～20wt .％Re以及1～5wt .％Y2O3；所述小粒径的纳米W‑Re‑Y2O3合金粉末通过溶胶凝胶法制备获得，具体为，先将柠檬酸溶解于去离子水中，然后分别加入偏钨酸铵、高铼酸铵、硝酸钇，水浴加热、搅拌直至形成胶体；将胶体干燥、煅烧后得到纳米氧化物粉体；将纳米氧化物粉体置于反应炉中，使用氢气还原得到W‑Re‑Y2O3粉末。本发明利用溶胶凝胶法实现了W和Re在原子尺度上的结合，且在煅烧时原位生成了Y2O3颗粒，使得Y2O3在粉末中均匀混合，制备的合金粉末颗粒平均粒径为12nm左右，还原的粉末无需后续处理。本发明制备方法简单，原料成本低，易于实现规模化生产。This invention relates to a nano-sized W-Re-Y₂O₃ alloy powder with small particle size and its preparation method. The nano-sized W-Re-Y₂O₃ alloy powder comprises, by mass percentage, 79-94 wt% W, 10-20 wt% Re and 1-5 wt% Y₂O₃. The nano-sized W-Re-Y₂O₃ alloy powder is prepared via a sol-gel method, and the specific preparation steps are as follows: first, dissolve citric acid in deionized water, then add ammonium metatungstate, ammonium perrhenate and yttrium nitrate respectively, heat in a water bath and stir until a colloid is formed; dry and calcine the colloid to obtain nano-sized oxide powder; place the nano-sized oxide powder in a reaction furnace, and reduce it with hydrogen to obtain W-Re-Y₂O₃ powder. This invention achieves the combination of W and Re at the atomic scale via the sol-gel method, and in-situ generates Y₂O₃ particles during calcination, enabling uniform dispersion of Y₂O₃ in the powder. The prepared alloy powder has an average particle size of approximately 12 nm, and the reduced powder requires no post-treatment. The preparation method of this invention is simple, features low raw material costs, and is suitable for large-scale production.