Authors:
Dr Jaroslav Kovacik (1), PhD.Eng. Dariusz Kołacz (1), PhD. Eng. Marcin Lis (1), Dr Eng. Joanna Kulasa (1)
1- Łukasiewicz Research Network-Institute of Non-Ferrous Metals, Gliwice, Poland
Abstract:
Mechanical properties of copper-graphite composites ought to be considered when designing their industrial applications in synergy with high electrical and thermal conductivity, low friction coefficient and coefficient of thermal expansion. Copper-graphite composites in range of 15-75 vol.% of graphite were densified using SPS technology at 900℃. Microstructures confirmed certain anisotropy for prepared composites. Random orientation is in cross section perpendicular to applied pressure, aligned graphite is in cross sections parallel to applied pressure. Compression properties: 0.2% yield stress, compression strength, reduction of height and modulus of elasticity were determined. Compression properties of copper-graphite system are nonlinear on composition, with increasing graphite volume fraction they are decreasing. Fracture surfaces were investigated: At 15 vol.% of graphite composite fracture is via ductile tearing, with increasing vol.% of graphite, intergranular fracture takes place. Some cleavage fracture paths are also partially observed. Finally, cross properties of compression properties to electrical conductivity were investigated.
DOI:
https://doi.org/10.59499/EP246282053
