2results about How to "Retain conductivity" patented technology

The application discloses a surface-defect-free high-purity oxygen-free copper wire manufacturing method based on continuous extrusion, relates to the field of non-ferrous metal precision machining technology, and directly adopts an up-drawing continuous casting billet to extrude a target specification wire rod in one step through continuous extrusion, so that a plurality of drawing processes and at least one intermediate annealing process in a traditional process are completely omitted, a process flow is compressed by more than 60%, a production cycle is significantly shortened, equipment investment, labor cost and energy consumption loss are reduced, wire rod production efficiency is greatly improved, large-scale production cost is greatly reduced, and the application has a strong industrialization advantage; the continuous extrusion process introduces large plastic deformation, can strongly break original as-cast coarse grains, and simultaneously compacts and eliminates internal defects such as pores and shrinkage porosity generated in the up-drawing continuous casting process, and improves wire rod density. Compared with a traditional processing method, the wire rod prepared by the application avoids problems such as annealing oxidation, uneven structure and performance fluctuation, and the elongation of a finished product is greater than or equal to 40%.

The application relates to a high-dispersion carbon nanotube reinforced PTFE composite material and a preparation method thereof, relates to the technical field of polymer composites, and comprises PTFE powder, surface-modified carbon nanotubes and a composite dispersant; wherein the surface-modified carbon nanotubes are multi-walled carbon nanotubes modified by a fluorosilane coupling agent, and the composite dispersant is composed of polyethylene glycol octyl phenyl ether and potassium perfluorooctyl sulfonate. The application has the effects of realizing stable and uniform dispersion of carbon nanotubes in a PTFE matrix, enhancing interface bonding force, and not damaging the intrinsic properties of the carbon nanotubes.