Study on Reducing Interface Defects of Diamond/Copper Composites by Doping Rare Earth La AITranslate
Abstract AITranslate
Diamond/copper composites with different contents of lanthanum were prepared by spark plasma sintering(SPS).Phase composition,interfacial microstructure and elemental distribution of the composites were characterized by XRD,SEM and EDS.Relative density and porosity of the composites were tested with drainage method.The interfacial electronic state density and atomic distance variation of the lanthanum-containing diamond/copper composites were calculated based on first-principles density functional theory. The calculated results show that the electronic state density of La and Cu has a wide pseudogap near the Fermi level,and the bonding ability between La and Cu is strong.After energy optimization by periodic plate model,the atomic spacing between La and Ti or Cu is significantly reduced,and the atomic spacing between La and Cu in the system is smaller,showing that the rare earth La and Cu matrix have stronger affinity. The experimental results show that a large amount of La is dissolved in the copper matrix,promoting the formation of Cu2La phase.With the increase of La content,the defects such as cracks and holes in the interface of the composites gradually decrease,and the relative density of the composites is gradually improved.The porosity of the composite without La is 3.48%,while the porosity of the composite with 7% La is decreased to 0.42%.The doped La in diamond/copper composites can effectively reduce the interface defects.
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Basic Information:
DOI：
Chinese Library Classification Number:TB333[一般工业技术—材料科学与工程]
Citation Information:
Diamond/copper composites with different contents of lanthanum were prepared by spark plasma sintering(SPS).Phase composition,interfacial microstructure and elemental distribution of the composites were characterized by XRD,SEM and EDS.Relative density and porosity of the composites were tested with drainage method.The interfacial electronic state density and atomic distance variation of the lanthanum-containing diamond/copper composites were calculated based on first-principles density functional theory. The calculated results show that the electronic state density of La and Cu has a wide pseudogap near the Fermi level,and the bonding ability between La and Cu is strong.After energy optimization by periodic plate model,the atomic spacing between La and Ti or Cu is significantly reduced,and the atomic spacing between La and Cu in the system is smaller,showing that the rare earth La and Cu matrix have stronger affinity. The experimental results show that a large amount of La is dissolved in the copper matrix,promoting the formation of Cu2La phase.With the increase of La content,the defects such as cracks and holes in the interface of the composites gradually decrease,and the relative density of the composites is gradually improved.The porosity of the composite without La is 3.48%,while the porosity of the composite with 7% La is decreased to 0.42%.The doped La in diamond/copper composites can effectively reduce the interface defects.
quote
| GB/T 7714-2015 | [1] ZHANG Xiao-yu, XU Min, CAO Sheng-zhu, et al. Study on Reducing Interface Defects of Diamond/Copper Composites by Doping Rare Earth La[J]. Rare Metals and Cemented Carbides, 2018(6): 70-76. |
| MLA | [1] ZHANG Xiao-yu, et al., "Study on Reducing Interface Defects of Diamond/Copper Composites by Doping Rare Earth La." Rare Metals and Cemented Carbides, no. 6, 2018, pp. 70-76. |
| APA | [1] ZHANG Xiao-yu, XU Min, CAO Sheng-zhu, GAO Heng-jiao, ZHANG Kai-feng, & ZHOU Hui. (2018). Study on Reducing Interface Defects of Diamond/Copper Composites by Doping Rare Earth La. Rare Metals and Cemented Carbides(6), 70-76. |
| IEEE | [1] ZHANG Xiao-yu, XU Min, CAO Sheng-zhu, GAO Heng-jiao, ZHANG Kai-feng, and ZHOU Hui, "Study on Reducing Interface Defects of Diamond/Copper Composites by Doping Rare Earth La," Rare Metals and Cemented Carbides, no. 6, pp. 70-76, 2018. keywords: {diamond/copper composite;interface defect;interface modification;La;the first principle} |