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首页> 外文期刊>Materials Science and Engineering >Uniform and graded copper open cell ordered foams fabricated by rapid manufacturing: surface morphology, mechanical properties and energy absorption capacity
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Uniform and graded copper open cell ordered foams fabricated by rapid manufacturing: surface morphology, mechanical properties and energy absorption capacity

机译：通过快速生产制造的均匀且渐变的铜开孔有序泡沫：表面形态，机械性能和能量吸收能力

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摘要

Pure copper open cell ordered foams (COCOF) have tremendous applications in the field of thermal mechanical management systems. These foams possess high thermal and electrical conductivity, sufficient mechanical strength and energy absorption capacity because of copper as the parent material. In the present study, the combination of ultrasonic assisted pressureless sintering and 3D printing as a rapid manufacturing technique has been used to fabricate COCOF. Two different unit cell designs, Simple Cubic (SC) and Body-Centered Cubic (BCC) were selected to fabricate uniform foams of three strut sizes 1, 1.3 and 1.6 mm and graded foams with strut size varying from 1 to 1.6 mm. The dimensional deviations of the fabricated COCOF samples from the designed CAD model were found to be less, as compared to the traditional metal printing technique i.e. electron beam melting (EBM). Significant effect on the surface roughness was noticed due to post processing on the fabricated COCOF. The SC and BCC fabricated by COCOF possessed 19-160 MPa Young's modulus, 2.5-25 MPa compressive strength, 2.5-30 MPa plateau stress and 1.2-9.3 MJ/m(3) energy absorption capacity. Moreover, the compression deformation behavior of these foams was investigated and found to be in-line with Ashby-Gibson model. However, due to micro-pores in fabricated COCOF, the struts were observed to be crushed during compression. The graded foam, with similar relative density, outperformed the uniform foam in terms of mechanical and energy absorption capacity for both SC and BCC COCOF. Moreover, the present method can be used to fabricate complex multi-functional thermal mechanical monolithic heat exchanger devices.
机译：纯铜开孔有序泡沫（COCOF）在热机械管理系统领域具有巨大的应用。由于铜是母体材料，这些泡沫具有高的导热性和导电性，足够的机械强度和能量吸收能力。在本研究中，超声辅助无压烧结与3D打印作为一种快速制造技术的结合已被用于制造COCOF。选择了两种不同的晶胞设计，即简单立方（SC）和体心立方（BCC），以制造三种尺寸分别为1、1.3和1.6毫米的均匀泡沫和具有1至1.6毫米不等的渐变泡沫。与传统的金属印刷技术（即电子束熔化（EBM））相比，发现从设计的CAD模型中制造的COCOF样品的尺寸偏差较小。由于在制造的COCOF上进行了后处理，因此注意到对表面粗糙度的显着影响。由COCOF制造的SC和BCC具有19-160 MPa的杨氏模量，2.5-25 MPa的抗压强度，2.5-30 MPa的平台应力和1.2-9.3 MJ / m（3）的能量吸收能力。此外，研究了这些泡沫的压缩变形行为，发现其与Ashby-Gibson模型一致。然而，由于在制造的COCOF中存在微孔，因此观察到在压缩过程中支柱被压碎。在SC和BCC COCOF的机械和能量吸收能力方面，相对密度相似的渐变泡沫优于均匀泡沫。而且，本方法可以用于制造复杂的多功能热机械整体式热交换器装置。

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