PDF(Pubmed)
Abstract：
Porous copper (Cu), with varying porosities, has been made using carbamide as a space holder through the powder metallurgy route. Two shapes of carbamide particles were used, (i) needlelike and (ii) spherical, in order to investigate the effect of the space holder shape on the pore structure and mechanical properties of porous Cu. The compressive deformation behavior of porous Cu was studied under a compression test. The pores\' structural characteristics and mechanical properties of the porous Cu varied significantly with the shape of the space holder. Although the effect of the space holder shape on the porosity was not regular, the effect on the mechanical properties was regular. The stress increased monotonically with the increase in the strain, and strain hardening occurred at the plastic yield stage. The elastic modulus and yield strength followed the power law, with the relative density irrespective of the space holder shape. The empirical constants associated with different empirically developed power law relations were different, according to the shape of space holder. A quantitative relationship between the elastic modulus and yield strength and the spacer content was obtained to control the mechanical properties of the present porous Cu or other porous metals and metal foams using the well-known space holder method.
摘要：
多孔铜(Cu),不同的孔隙度，已通过粉末冶金路线使用尿素作为空间保持器。使用了两种形状的尿素颗粒，(i)针状和(ii)球形，为了研究空间支架形状对多孔Cu孔结构和力学性能的影响。在压缩试验下研究了多孔铜的压缩变形行为。多孔铜的孔隙结构特征和机械性能随空间保持器的形状而显着变化。尽管空间保持器形状对孔隙率的影响不是规则的，对机械性能的影响是有规律的。应力随着应变的增加而单调增加，应变硬化发生在塑性屈服阶段。弹性模量和屈服强度遵循幂律，与相对密度无关的空间保持器的形状。与不同经验发展的幂律关系相关的经验常数是不同的，根据空间支架的形状。使用众所周知的空间保持器方法获得弹性模量和屈服强度与间隔物含量之间的定量关系以控制本发明的多孔Cu或其他多孔金属和金属泡沫的机械性能。
