Effective load transfer by a chromium carbide nanostructure in a multi-walled carbon nanotube/copper matrix composite
Effective load transfer by a chromium carbide nanostructure in a multi-walled carbon nanotube/copper matrix composite
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DOI：
10.1088/0957-4484/23/31/315705
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发表时间：
2012-08
期刊：
影响因子：
3.5
通讯作者：
Seungchan Cho;K. Kikuchi;A. Kawasaki;H. Kwon;Yangdo Kim
中科院分区：
文献类型：
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作者：
Seungchan Cho;K. Kikuchi;A. Kawasaki;H. Kwon;Yangdo Kim
采用CuCr合金粉末，通过碳化物形成法制备了多壁碳纳米管（MWCNT）增强铜（Cu）基复合材料。采用放电等离子烧结（SPS），然后热挤压制备完全致密化和取向的多壁碳纳米管分散在整个复合材料。MWCNT/CuCr复合材料的拉伸强度随着MWCNT含量的增加而增加，而MWCNT/Cu复合材料的拉伸强度相对于整体Cu有所下降。MWCNT/CuCr复合材料的增强的拉伸强度是界面Cr碳化物纳米结构的可能的负载转移机制的结果。在MWCNT/CuCr复合材料的断裂表面中观察到的MWCNT的多壁失效表明MWCNT的承载能力的改善。该结果表明，在断裂过程中，通过在MWCNT/Cu复合材料中形成碳化物纳米结构，Cr碳化物纳米结构有效地将拉伸载荷传递到MWCNT。
Multi-walled carbon nanotube (MWCNT) reinforced copper (Cu) matrix composites, which exhibit chromium (Cr) carbide nanostructures at the MWCNT/Cu interface, were prepared through a carbide formation using CuCr alloy powder. The fully densified and oriented MWCNTs dispersed throughout the composites were prepared using spark plasma sintering (SPS) followed by hot extrusion. The tensile strengths of the MWCNT/CuCr composites increased with increasing MWCNTs content, while the tensile strength of MWCNT/Cu composite decreased from that of monolithic Cu. The enhanced tensile strength of the MWCNT/CuCr composites is a result of possible load-transfer mechanisms of the interfacial Cr carbide nanostructures. The multi-wall failure of MWCNTs observed in the fracture surface of the MWCNT/CuCr composites indicates an improvement in the load-bearing capacity of the MWCNTs. This result shows that the Cr carbide nanostructures effectively transferred the tensile load to the MWCNTs during fracture through carbide nanostructure formation in the MWCNT/Cu composite.