Joshi P B, Rehani Bharati, Naik Palak, Patel Swati, Khanna P K
Department of Metallurgical and Materials Engineering, M. S. University of Baroda, Vadodara 390001, India.
J Nanosci Nanotechnol. 2012 Mar;12(3):2591-7. doi: 10.1166/jnn.2012.5748.
Oxide dispersion-strengthened copper-base composites are widely used for applications demanding high tensile strength, high hardness along with good electrical and thermal conductivity. Oxides of metals like aluminium, cerium, yttrium and zirconium are often used for this purpose as fine and uniformly distributed dispersoid particles in soft and ductile copper matrix. Such composites find applications as electrical contacts, resistance-welding tips, lead wires, continuous casting moulds, etc. In this investigation an attempt has been made to produce copper-yttria nanocomposites using two different morphologies of copper powder and two different processing routes namely, high-energy milling and in-situ chemical reduction. The synthesized powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) for their phase identification and morphological study. The nanocomposite powders in each case were subsequently processed to obtain bulk solids by classical powder metallurgy route of press-sinter-repress. The resultant bulk solid compacts were subjected to property evaluation. The study revealed that the properties of Cu-Y2O3 nanocomposites depend on the processing route used and in turn on the resultant powder morphology.
氧化物弥散强化铜基复合材料广泛应用于要求具有高拉伸强度、高硬度以及良好导电性和导热性的领域。铝、铈、钇和锆等金属的氧化物常被用作细小且均匀分布的弥散质点，存在于柔软且具有延展性的铜基体中。这类复合材料可用作电触头、电阻焊电极头、引线、连铸结晶器等。在本研究中，尝试使用两种不同形态的铜粉以及两种不同的加工路线，即高能球磨和原位化学还原法，来制备铜 - 氧化钇纳米复合材料。通过X射线衍射（XRD）和扫描电子显微镜（SEM）对合成的粉末进行表征，以确定其物相并进行形态学研究。随后，通过经典的压制 - 烧结 - 复压粉末冶金路线，对每种情况下的纳米复合粉末进行加工，以获得块状固体。对所得的块状固体压坯进行性能评估。研究表明，Cu - Y₂O₃纳米复合材料的性能取决于所采用的加工路线，进而取决于所得粉末的形态。
