Deformation processed Al/Ca nano-filamentary composite conductors for HVDC applications

38th Risø International Symposium on Materials Science

Czahor, C.F.^1,2,3 ; Anderson, I.E.^1,2 ; Riedemann, T.M.^1 ; Russell, A.M.^1,2

Ames Laboratory, U.S. Department of Energy, Ames

IA, United States^1

Materials Science and Engineering, Iowa State University, Ames

IA, United States^2

Wind Energy Science Engineering and Policy, Iowa State University, Ames

IA, United States^3

关键词: Conductor materials;    Electrical conductivity;    Elevated temperature;    Filamentary composite;    High-conductivity materials;    Remote areas;    Renewable energy source;    True strain;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/219/1/012014/pdf
DOI  :  10.1088/1757-899X/219/1/012014

来源: IOP

【 摘 要 】

Efficient long-distance power transmission is necessary as the world continues to implement renewable energy sources, often sited in remote areas. Light, strong, high-conductivity materials are desirable for this application to reduce both construction and operational costs. In this study an Al/Ca (11.5% vol.) composite with nano-filamentary reinforcement was produced by powder metallurgy then extruded, swaged, and wire drawn to a maximum true strain of 12.7. The tensile strength increased exponentially as the filament size was reduced to the sub-micron level. In an effort to improve the conductor's ability to operate at elevated temperatures, the deformation-processed wires were heat-treated at 260°C to transform the Ca-reinforcing filaments to Al2Ca. Such a transformation raised the tensile strength by as much as 28%, and caused little change in ductility, while the electrical conductivity was reduced by only 1% to 3%. Al/Al2Ca composites are compared to existing conductor materials to show how implementation could affect installation and performance.