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Physical and mechanical properties of porous copper nanocomposite produced by powder metallurgy

机译:粉末冶金生产的多孔铜纳米复合材料的物理机械性能

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In this study porous copper nanocomposite reinforced with Al2O3 nanoparticles was successfully produced with adjustable mechanical properties and homogeneous pore morphology using powder metallurgy process. For this purpose, lost carbonate sintering (LCS) method with K2CO3 as a filler material was used to fabricate composite foam. The process consisted of mixing of metal powder and adjustable nano particles along with filler material, pressing and sintering. Under this condition the filler material was disappeared during sintering and a homogenous porous structure was formed. Experiments were conducted with 2 wt.% of nano alumina and different weight fractions (15, 20, 30, 40, and 50) of K2CO3. Type and morphology of pores were investigated using scanning electron microscopy (SEM). Differential thermal analysis (DTA) and thermo gravimetric analysis (TGA) were also carried out to determine thermal behavior of potassium carbonate. EDS and XRD methods were used to analyze phase transformation during manufacturing process. Mechanical properties of the produced samples were investigated by uniaxial compression test. Compressive behavior of nanocomposite copper foams showed that they present more enhanced mechanical behavior in comparison with regular copper foams. The results showed that plateau stress of nanocomposite foam increased more than 2 times in compared with regular copper foam in same porosity percentage. The examination of uniaxial compression tests showed that the plateau stress and energy absorption of nanocomposite foams were in the range of 18-111 MPa and 6.82-29.97 MJ/m(3), respectively. (C) 2016 Published by Elsevier B.V. on behalf of The Society of Powder Technology Japan. All rights reserved.
机译:在这项研究中,使用粉末冶金工艺成功制备了具有可调节的机械性能和均一的孔形态的,用Al2O3纳米颗粒增强的多孔铜纳米复合材料。为此,使用了以K2CO3为填充材料的失碳酸盐烧结(LCS)方法来制造复合泡沫材料。该过程包括将金属粉末和可调节的纳米颗粒与填料一起混合,压制和烧结。在这种条件下,填料在烧结过程中消失,形成均匀的多孔结构。用2 wt。%的纳米氧化铝和不同重量分数(15、20、30、40和50)的K2CO3进行了实验。使用扫描电子显微镜(SEM)研究孔的类型和形态。还进行了差热分析(​​DTA)和热重分析(TGA),以确定碳酸钾的热行为。 EDS和XRD方法用于分析制造过程中的相变。通过单轴压缩试验研究了所产生样品的机械性能。纳米复合铜泡沫的压缩行为表明,与常规铜泡沫相比,它们的机械性能更高。结果表明,在相同的孔隙率下,纳米复合泡沫的平台应力是普通泡沫的两倍以上。单轴压缩试验的结果表明,纳米复合泡沫的平台应力和能量吸收分别在18-111 MPa和6.82-29.97 MJ / m(3)的范围内。 (C)2016由Elsevier B.V.代表日本粉末技术学会出版。版权所有。

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