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The microstructure and Te distribution in Cu-25CrTe contact materials doped with 0.01, 0.6 and 2.0 pct Te respectively were investigated by TEM with an EDS system. Meanwhile the tensile strength of eight Cu-25CrTe contact materials at ambient temperature was measured. It is shown that Te atoms segregate at the interface of Cu/Cr phases in the Cu-25CrTe materials; a globular CrCu2Te 2 intermetallic...
Tensile fracture at room temperature and the faying microstructures of vacuum casting Cu-30CrTe, Cu-30Cr and sintered CuCr25 contact materials after diffusion welding in vacuum were evaluated by Optical Microscope and SEM. It is shown that there are different fracture characteristics in the three contact materials, and distinct microstructures formed at the faying surface of the Cu-30CrTe from that...
The composition and bonding energy of Te segregation in Cu-30Cr-0.01Te alloy contact material were investigated by X-ray photoelectron spectroscopy. Photoelectron patterns from the main chemical elements of Cu, Cr and Te on the fresh fracture surface of Cu-30Cr-0.01Te alloy contact material show that Te atoms highly segregated at the interface of Cu/Cr phases, thus the structure and property of the...
Diffusion welding tests of vacuum casting Cu-30Cr, Cu-30CrZr, Cu-30CrTe and Cu-30CrZrTe alloy contact materials as well as sintered CuCr25 p/m contact materials were performed in the vacuum chamber of Gleeble 3500, and the joining forces of the welded pairs were measured by tensile test at ambient temperature. Characteristics of fracture surfaces were analyzed by optical microscope and SEM. It shows...
The microstructure and interface of Cu/Cr phases in vacuum casting Cu-25Cr alloy and sintered CuCr25 p/m contact materials were investigated by transmission electron microscopy (TEM). Some fine secondary Cr-dendrites have preferred orientation relationships of (110)Cr // (111)Cu and [011]Cr // [1macr12]Cu, and a single set of misfit dislocations separated by a space of ~6 nm are distributed on the...
Mechanical properties of two sorts of CuCr(75/25) contact materials adopted widely for vacuum interrupters were determined by standard tensile test and impact test, and fracture characteristics of these two materials after tests were analyzed by optical and SEM equipped with EDS. It was shown that the tensile strength, ductility and impact strength of Cu-25Cr alloy contact material by vacuum casting...
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