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Synthesis and Characterization of Nickel-Alumina Composites from Recycled Nickel Powder

机译:来自再生镍粉的镍 - 氧化铝复合材料的合成与表征

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摘要

The recycling of metallic waste to create more valuable materials and their valorization into upgraded metal-based composites constitutes an important field of study. The composite industry nowadays considers environmental improvements as important as other properties of the materials. In the present paper, nickel powder was recycled from ferrous scrap, a low-cost and largely available material, by an effective hydrometallurgical recovery process. Then, this recycled powder was successfully used along with particulate α-alumina to prepare oblong nickel-based composite specimens with ceramic reinforcement loadings ranging from 0 to 30 wt.% by applying powder processing manufacturing techniques including cold isostatic pressing (CIP) and sintering. The microstructures obtained were characterized, the specimens were subjected to three-point bend tests, and their fracture behaviour was evaluated. By increasing the % ceramic reinforcement content, density clearly decreases while strengthening is achieved, thus leading to development of lightweight and enhanced oblong nickel-alumina composites. The composite microstructure, and particularly the metal-ceramic interface bonding, has a strong impact on fracture behaviour upon external loading.
机译:金属废物的回收利用更有价值的材料及其算入升级的金属基复合材料构成了一个重要的研究领域。现在,综合行业认为与材料的其他性质同样重要的环境改善。在本文中,通过有效的液压冶金回收过程,镍粉末从黑色金属废料,低成本和大部分可用材料再循环。然后,通过颗粒α-氧化铝成功地使用该再循环粉末,以制备具有陶瓷增强件的基于镍基复合标本,该标本范围为0至30重量%。通过施加粉末加工制造技术,包括冷等静压(CIP)和烧结。所获得的微观结构的特征在于,对样本进行三点弯曲试验,评价其骨折行为。通过增加陶瓷增强型含量%,在实现增强的同时,密度明显降低,从而导致轻质和增强的椭圆形镍 - 氧化铝复合材料的开发。复合微观结构,特别是金属陶瓷界面粘合,对外部负载时对骨折行为产生强烈影响。

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