Net shape manufacturing of CuCr for vacuum interrupters

Kowanda, C.; Hochstrasser, M.; Schwaiger, A.; Müller, F. Max; Plankensteiner, A.; Grohs, Christian

doi:10.1109/tdei.2011.6118654

Cited by 16 publications

(4 citation statements)

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“…To reduce the microporous defects of the CuCr alloy prepared by the infiltration method, Ma et al [9] conducted a high-pressure heat treatment of CuCr50 alloy prepared by the infiltration method and found that the microstructure of CuCr50 alloy prepared by the infiltration method did not change significantly before and after the 1 GPa high-pressure heat treatment, as shown in Figure 3, but the density of the alloy increased from 8.044 g/cm 3 to 8.058 g/cm 3 . e highpressure treatment bridged the internal micropores in the CuCr alloy, thus reducing the micropores and increasing the density of the alloy, as shown in Figure 4.…”

Section: Infiltration Methodmentioning

confidence: 99%

“…CuCr alloys with mass fraction of Cr that are generally in the range of 25% to 50% are widely used in 10∼40.5 kV mediumvoltage vacuum interrupters due to their high mechanical strength and good electrical conductivity [1][2][3][4][5][6][7]. During the solidi cation of CuCr alloys, the process of two-phase separation in CuCr alloys consists of three stages, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Progress in the Preparation of Large-Size High-Performance CuCr Alloys

Han

Zhang

et al. 2022

Advances in Materials Science and Engineering

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CuCr contact material, whose mass fraction of Cr is generally in the range of 25% to 50%, is one of the most desirable contact materials for medium- and high-voltage vacuum switches. The homogeneity and denseness of CuCr alloy are the keys to its application. The infiltration and powder sintering have defects, such as uneven distribution of Cr phase, and great difficulties in preparing high-performance CuCr alloys with low gas content; the equipment investment in the vacuum consumable arc melting method is large and the production cost is high, while mechanical alloying, vacuum induction melting, and laser-selective melting as new technologies are still in the laboratory stage. From the perspective of surface modification treatment and multicomponent alloying, refinement of Cr phase grains can improve the properties of CuCr alloy. The new process of aluminothermic reduction-electromagnetic coupling refining-water and gas composite rapid cooling takes oxides as raw material and obtains a fully miscible CuCr alloy melt by aluminothermic reduction theoretically at 2848K, followed by secondary refining under electromagnetic field coupling and water-gas composite cooling and casting, which can obtain alloy ingots of 50 mm in diameter and 10 mm in height. The density and hardness of CuCr alloy prepared by this process as vacuum contact material are better than the requirements of GB/T 26867-2011, so this process has the potential to become a new-generation preparation method for large-size homogeneous high-performance CuCr alloy.

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Section: Infiltration Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Progress in the Preparation of Large-Size High-Performance CuCr Alloys

Han

Zhang

et al. 2022

Advances in Materials Science and Engineering

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“…Cu-Cr alloys have been widely used in electronic and electrical industries due to their high voltage resistance, excellent welding resistance and current carrying capacity [1][2][3][4]. With the development of electronic industry, Cu-Cr alloys have been considered as the promising candidate for obtaining the excellent balance between the good electrical conductivity and considerable strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of high temperature-high pressure treatment on microstructure and mechanical properties of Cu-Cr alloy

et al. 2020

Mater. Res. Express

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The microstructure of the Cu-Cr alloy prepared by infiltration before and after different pressures treatment at 900°C for 10 min was observed by metallographic microscope, scanning electron microscope (SEM), and transmission electron microscopy (TEM). And the mechanical properties were measured by nanoindenter, hardness tester and tensile testing machine. According to the experimental results, the effects of high pressure treatment on the mechanical properties were discussed. The results showed that the hardness of Cu matrix and Cr phase were 114Hv and 194Hv under the pressure of 3 GPa, which were 18.75% and 10.23% higher than those of the infiltrated alloy. Also, the hardness and compression yield strength of Cu-Cr alloy were 134 HB and 241 MPa after 3 GPa pressure treatment, respectively, 11.67%, 19.31% higher than those of the infiltrated alloy. On the basis of analysis, the high pressure treatment can improve the compactness of Cu-Cr alloys, promote the precipitation of nanometer Cr particles and increase the hardness and elastic modulus of Cu matrix and Cr phase, resulting in the improvement of hardness and compression yield strength in Cu-Cr alloys. In the range of 1∼6 GPa, the hardness and compression yield strength of alloys increase with the increase of pressure. However, these mechanical properties of Cu-Cr alloy increases slowly when the pressure exceeds 1 GPa.

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“…For the medium and high voltage range up to 84 kV copper-chromium (CuCr) alloys are used as contact material. The Cr content typically varies between 20 wt% and 60 wt% depending on the application [3].…”

Section: Introductionmentioning

confidence: 99%