Method for manufacturing CNT (carbon nanotube) composite transmission conductor

Abstract

The invention discloses a method for manufacturing a CNT (carbon nanotube) composite transmission conductor, which comprises the following steps: filling MCNT (multiwalled carbon nanotube) powder accounting for 1 to 7 percent of the total mass into small holes uniformly drilled on electrotechnical aluminium blocks; stacking two aluminium blocks in which the MCNT powder has been filled inversely by using a blind-hole method; after the two aluminium blocks are prepared into composite materials through a friction extrusion process, carrying out tandem rolling and drawing on the composite materials so as to prepare the composite materials into required CNT/aluminum based composite material round wires; and finally, stranding the round wires by a wire twisting machine, then through a back-twisting stress eliminating device, obtaining a single-stranded CNT composite transmission conductor. The method of the invention has the advantages: 1) the coefficient of linear expansion of the conductor is small, and the thermal deformation resistance performance is strong, the method can reduce the influence of the temperature on sag change, improve the sag characteristics, improve the security of overhead lines, and reduce the construction cost of the lines; 2) the method is helpful to improve the conductivity of the conductor along the line, and further reduce the transmission losses; and 3) the process is relatively simple, and the loosening and skid phenomenon and the like of composite cores and aluminium strands due to various reasons do not exist.

Description

technical field [0001] The invention relates to a method for manufacturing a composite power transmission wire, in particular to a method for manufacturing a carbon nanotube composite power transmission wire. Background technique [0002] The transmission wires of traditional overhead lines are mostly steel-cored aluminum stranded wires, and there are many problems in actual use: such as: 1) The reinforced steel core greatly increases the weight of the wires, so the span between the towers of overhead lines needs to be short or Strengthen the strength of the tower, otherwise the load capacity of the tower is not enough, so the cost of the line will increase; 2) The existing magnetic loss and thermal effect will make the transmission loss of the line large; 3) The linear expansion coefficient of the steel core is large, and the change of working conditions will make the arc of the wire 4) The electrochemical corrosion between the aluminum wire and the galvanized steel core ...

AI Technical Summary

Problems solved by technology

[0002] The transmission wires of traditional overhead lines are mostly steel-cored aluminum stranded wires, and there are many problems in actual use: such as: 1) The reinforced steel core greatly increases the weight of the wires, so the span between the towers of overhead lines needs to be short or Strengthen the strength of the tower, otherwise the load capacity of the tower is not enough, so the cost of the line will increase; 2) The existing magnetic loss and thermal effect will make the transmission loss of the line large; 3) The linear expansion coefficient of the steel core is large, and the change of working conditions will make the arc of the wire 4) The electrochemical corrosion between the aluminum wire and the galvanized steel core reduces the service life of the wire

However, related to the inherent physical and chemical properties of nanophases, the preparation of nanophase-reinforced composites is much more complicated and difficult than that of ordinary composites.

For example, at present, the preparation of carbon nanotubes / aluminum matrix composites at home and abroad mainly adopts powder metallurgy method, melt impregnation method, in-situ synthesis method, high energy ball milling method, rapid solidification method, electroless plating method, plasma spray molding method, etc. Both methods need to pre-prepare the powder mixture of carbon nanotubes and aluminum matrix, the dispersion of carbon nanotubes in the matrix is ​​restricted, and methods such as high-energy ball milling will also cause damage to the perfect structure of carbon nanotubes, thereby weakening the excellent performance of composite materials