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Abstract
Cu/Al2O3 ceramic clad composites are widely used in electronic packaging and electrical contacts. However, the conductivity and strength of the interfacial layer are not fit for the demands. So CeO2 nanoparticles 24.3 nm in size, coated on Al2O3 ceramic, promote a novel CeO2–Cu2O–Cu system to improve the interfacial bonded strength. Results show that the atom content of O is increased to approximately 30% with the addition of CeO2 nanoparticles compared with the atom content without CeO2 in the interfacial layer of Cu/Al2O3 ceramic clad composites. CeO2 nanoparticles coated on the surface of Al2O3 ceramics can easily diffuse into the metallic Cu layer. CeO2 nanoparticles can accelerate to form the eutectic liquid of Cu2O–Cu as they have strong functions of storing and releasing O at an Ar pressure of 0.12 MPa. The addition of CeO2 nanoparticles is beneficial for promoting the bonded strength of the Cu/Al2O3 ceramic clad composites. The bonded strength of the interface coated with nanoparticles of CeO2 is increased to 20.8% compared with that without CeO2; moreover, the electric conductivity on the side of metallic Cu is 95% IACS. The study is of great significance for improving properties of Cu/Al2O3 ceramic clad composites.
Highlights
Cu/Al2 O3 ceramic clad composites have anti-wear, anti-corrosion, and anti-high temperature characteristics of ceramics and maintain the high conductivity and machinability of copper
The results show that the addition of nanoparticles CeO2 is beneficial for reducing the bonding temperature
The atom content of O is increased to approximately 30% with addition of CeO2 nanoparticles
Summary
Cu/Al2 O3 ceramic clad composites have anti-wear, anti-corrosion, and anti-high temperature characteristics of ceramics and maintain the high conductivity and machinability of copper. They have been widely used in rail transit, electronic packaging, and electrical contacts [1,2]. To obtain a stable and reliable Cu/Al2 O3 ceramic clad structure, the wettability between metals and ceramics and the formation of brittle compounds at the interface must be addressed. These problem are of great research significance [3,4]
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