Effect of Lubricants and Annealing Treatment on the Electrical Conductivity and Microstructure of Rolled Copper Foil

Abstract

X-ray diffraction and transmission electron microscopy have been used to study the microstructure of copper foil during rolling. Annealing was used to release work hardening of rolled copper foil (RCF), and electrical conductivity was determined by use of a PPMS-9 comprehensive physical property-measurement system. The microstructure and electrical conductivity of RCF are discussed. Our results showed that the relative intensity of the (220) diffraction peak increased continuously with decreasing sample thickness and that rolling induced preferred orientation. Many obvious crystallographic defects were present; these seriously affected electrical conductivity. The electrical conductivity of RCF decreases with increasing lattice distortion and micro defects which occur during deformation, especially when the surface adsorbs lubricant. However, annealing reduced lattice distortion and the scattering of conducting electrons at these defects, thus improving the electrical properties. For foil thickness in the range 25-180 lm, annealing temperatures in the range 150-300°C, and annealing times in the range 2.5-3.0 h, the electrical conductivity of RCF increased with increasing thickness and annealing temperature, and decreased with increasing annealing time.

Sliding wear‐induced nano‐tribofilm formation from EP/AW agent on copper foil against ferroalloy counterparts under high load

“…It indicates that ferroalloy rubbing against foil is along the Cu (111) direction, which agreed with the slip direction as shown in Figure B. Such a marked increase in peak width with the diffraction angle is a clue of the presence of a strong lattice distortion (microstrain) effect . Considering the friction conditions under which the wear debris formed, it is reasonable to assume that the main contribution to microstrain is due to dislocations .…”

“…Such a marked increase in peak width with the diffraction angle is a clue of the presence of a strong lattice distortion (microstrain) effect . Considering the friction conditions under which the wear debris formed, it is reasonable to assume that the main contribution to microstrain is due to dislocations . A detail of the low angle portion of the pattern in log scale is shown in the inset.…”

Synthesis, characterisation, and tribological evaluation of Mn3B7O13Cl nanoparticle as efficient antiwear lubricant in the sliding wear between tantalum strips and steel ball

“…The thickness of tribofilm is approximately 30 nm, which proves that the nano‐Mn 3 B 7 O 13 Cl reacts with metal to form a chemical nano‐tribofilm, thus reducing the friction coefficient. The tribofilms were formed by tribo sintering, which occurs at high pressures in combination with friction energy …”

“…The tribofilms were formed by tribo sintering, which occurs at high pressures in combination with friction energy. 26 3.7 | XPS spectra of tantalum strip's surface after wear Figure 9 shows the XPS spectra of tantalum strip with nano-Mn 3 B 7 O 13 Cl lubrication after sliding. For Ta 4f spectra, given in Figure 9A, the binding energies of 26.49 and 28.58 eV are assigned to the Ta 4f7/2 and Ta 4f5/2 signals of Ta 2 O 5 , respectively.…”

Pitting Corrosion Behavior and Surface Microstructure of Copper Strips When Rolled with Oil-in-Water Emulsions

“…The component of experimental Cu sample is shown in Table 1, which was obtained from the same raw strip as our previous study [18]. The strip was at hard state without any heat treatment and was cut with a size of 10 mm × 10 mm × 1.98 mm.…”