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Fabrication and properties of silver-based composites reinforced with carbon-coated Ti3AlC2

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  • Received: 13 March 2020Revised: 1 April 2020Accepted: 7 April 2020Available online: 12 April 2020
  • Ti3AlC2 reinforced Ag-based composites are used as sliding current collectors, electrical contacts and electrode materials, which shows remarkable performance. However, the interfacial reactions between Ag and Ti3AlC2 significantly deteriorate the electrical and thermal properties of the composite. To alleviate the interfacial reactions, carbon-coated Ti3AlC2 particles (C@Ti3AlC2) were fabricated as reinforcement. Ag-10wt.% C@Ti3AlC2 composites with carbon layer thickness of 50-200 nm were prepared. Compared with the uncoated Ag-Ti3AlC2 composite, Ag-C@Ti3AlC2 exhibits a better distribution of Ti3AlC2 particles. With the increase of carbon layer thickness, the Vickers hardness and relative density of Ag-C@Ti3AlC2 decline gradually. The lowest resistivity of Ag-C@Ti3AlC2 reaches 29.4×10-9 Ω·m with the carbon layer thickness of 150 nm, half of the Ag-Ti3AlC2 (66.7×10-9 Ω·m). The thermal conductivity of Ag-C@Ti3AlC2 reaches a maximum value of 135.5 W·m-1·K-1 with a 200-nm carbon coating (~1.8 times over that of the Ag-Ti3AlC2). These results indicate that carbon coating method is a feasible strategy to improve the performance of Ag-C@Ti3AlC2 composites.
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Fabrication and properties of silver-based composites reinforced with carbon-coated Ti3AlC2

  • 1. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
  • 2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, Anhui, PR China

Abstract: Ti3AlC2 reinforced Ag-based composites are used as sliding current collectors, electrical contacts and electrode materials, which shows remarkable performance. However, the interfacial reactions between Ag and Ti3AlC2 significantly deteriorate the electrical and thermal properties of the composite. To alleviate the interfacial reactions, carbon-coated Ti3AlC2 particles (C@Ti3AlC2) were fabricated as reinforcement. Ag-10wt.% C@Ti3AlC2 composites with carbon layer thickness of 50-200 nm were prepared. Compared with the uncoated Ag-Ti3AlC2 composite, Ag-C@Ti3AlC2 exhibits a better distribution of Ti3AlC2 particles. With the increase of carbon layer thickness, the Vickers hardness and relative density of Ag-C@Ti3AlC2 decline gradually. The lowest resistivity of Ag-C@Ti3AlC2 reaches 29.4×10-9 Ω·m with the carbon layer thickness of 150 nm, half of the Ag-Ti3AlC2 (66.7×10-9 Ω·m). The thermal conductivity of Ag-C@Ti3AlC2 reaches a maximum value of 135.5 W·m-1·K-1 with a 200-nm carbon coating (~1.8 times over that of the Ag-Ti3AlC2). These results indicate that carbon coating method is a feasible strategy to improve the performance of Ag-C@Ti3AlC2 composites.

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