Abstract

To fabricate Cu–Ti composite particles, the method of copper deposition from its sulfate solution on titanium powder particles with the simultaneous mechanical activation (MA) of the mixture in an AGO‑2 planetary ball mill for 5 min is used. The CuSO₄ ⋅ 5H₂O concentration in solutions is 10 and 16%, which provides molar ratio Cu/Ti = 0.85 and 1.36, respectively, with the complete reduction of copper. The rapid reduction of copper in the form of highly dispersed partially amorphized powder occurs during MA, and composite particles with a thin laminate structure and high reaction ability are formed. Prepared composites are rinsed and stored in argon because reduced copper possesses high activity and rapidly oxidizes in air to oxide Cu₂O. After drying, the additional MA of the mixture is performed for 5 min. Pellets 3 mm in diameter and up to 1.5 mm in height are compacted from prepared powders and heated in argon to 700–1200°C. An intense reaction with heat liberation (heat explosion) and the formation of TiCu, Ti₂Cu₃, and Ti₂Cu intermetallic compounds starts upon sample heating. The critical inflammation temperature for composite powders formed by MA with simultaneous copper deposition from the solution is 480°C, which is 400°C below the inflammation temperature of the usual powder mixture of titanium and copper. The alloy has a dendritic structure at a heating temperature close to the melting point, while, if it is exceeded by more than 100°C, the phase distribution in the alloys becomes more uniform and their size decreases.

中文翻译：

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铜同时从硫酸盐溶液中沉积到钛粉上，同时进行机械活化

摘要

为了制造Cu-Ti复合颗粒，使用了在AGO-2行星式球磨机中进行5分钟的同时机械活化（MA）的方法，即从硫酸盐溶液中的铜溶液沉积到钛粉颗粒上。所述的CuSO ₄ ⋅5H ₂ ö以溶液浓度为10和16％，这提供了摩尔比的Cu / Ti的= 0.85和1.36，分别与铜的完全还原。在MA中，以高度分散的部分非晶态粉末的形式快速还原铜，并且形成了具有薄层压结构和高反应能力的复合颗粒。将制备的复合材料冲洗并保存在氩气中，因为还原的铜具有很高的活性，并在空气中迅速氧化为氧化铜₂O.干燥后，对混合物进行另外的MA 5分钟。将制得的粉末压制成直径3毫米，高1.5毫米的颗粒，并在氩气中加热至700–1200°C。与放热（热爆炸）发生强烈反应，并形成TiCu，Ti ₂ Cu ₃和Ti ₂铜金属间化合物在样品加热时开始。由MA形成的复合粉末的临界炎症温度为480°C，同时从溶液中沉积出铜，这比通常的钛和铜粉末混合物的炎症温度低400°C。该合金在接近熔点的加热温度下具有树枝状结构，而如果超过100℃，则合金中的相分布变得更加均匀并且其尺寸减小。