Novel processing of Ag-WC electrical contact materials using spark plasma sintering

Ray, Nachiketa; Kempf, B.; Wiehl, Gunther; Mützel, Timo; Heringhaus, F.; Froyen, Ludo; Vanmeensel, Kim; Zhang, Fei

doi:10.1016/j.matdes.2017.02.070

Cited by 35 publications

(5 citation statements)

References 14 publications

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“…Recently, with the widespread use of low voltage electrical contact elements, the amount of electrical contact materials has increased dramatically. General industrial application electrical contact materials are made of Ag-based composite materials with Ag content of 80-90% [8][9][10] . The Ag of the contact materials is difficult to recycle, and the production of which is relatively limited.…”

Section: Introductionmentioning

confidence: 99%

Contrastive Research on Electrical Contact Performance for Contact Materials of Cu-SnO2 and Cu-ZnO2 Alloys

et al. 2019

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Herein, SnO 2 -and ZnO 2 -doped (1.5 wt.%) composite Cu powder was prepared by mechanical alloying (MA) respectively, and both the contact materials of oxide-doped Cu alloys were subsequently obtained by canned hot-pressing powder sintering with hot extrusion combined. Scanning electron microscopy (SEM), laser scanning confocal microscopy (LSCM) and self-designed electrical breakdown device were used for investigating the microstructure and properties including electric conductivity and hardness, especially for electrical contact performance of the Cu-SnO 2 alloy and in compared with the Cu-ZnO 2 alloy. The experimental results show that the hardness of Cu-SnO 2 and Cu-ZnO 2 contact materials are 103.5±1 HV and 192.7±1 HV, respectively, which meet the hardness standard of national standard electrical contact materials. Meanwhile, the relative conductivity %IACS are 7.24% and 6.20%, respectively, which are higher than the traditional Cu-based contact materials. This electrical life simulation test system was designed independently, and the results indicate that the switching times of Cu-SnO 2 contact materials are much more than that of Cu-ZnO 2 . The addition of SnO 2 can effectively improve the arc extinguishing characteristics and the anti-welding performance of the contact materials is enhanced. In summary, SnO 2 -doped Cu-based contact materials possess excellent comprehensive properties, which can provide reference for potential applications in contact materials.

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Section: Introductionmentioning

confidence: 99%

Contrastive Research on Electrical Contact Performance for Contact Materials of Cu-SnO2 and Cu-ZnO2 Alloys

et al. 2019

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“…However, in some kind of hybrid SMCs like Ag-Fe-Cu or Ag-W-C which are applied in complex composite contacts, two different constituents have been used as the reinforcement. The volume percent of silver and the kind of reinforcement(s) depend on the application of the contact material [3][4][5]. The conventional method for production of SMCs is powder metallurgy route.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Ag-8 %wt Cr2O3 composites prepared by different densification processes

2018

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A novel Ag-8 %wt Cr 2 O 3 composite prepared via powder metallurgy route. Silver and chromium oxides were used as starting powders. The powder mixtures were mechanically milled by a SPEX high energy mill for 5 h. Based on the thermogravimetric analysis (TGA) and X-Ray Diffraction (XRD) results, the milled powders were calcined in an argon atmosphere at 550 °C. During calcination, the silver oxide decomposed into silver. The results showed that the Heckel equation was the preferred one for description the cold compressibility of the powders. The calcined powders were consolidated by Press-Sinter-Repress (PSR), Press-Sinter-Repress-Anneal (PSRA) and Spark Plasma Sintering (SPS) processes. The Field Emission Scanning Electron Microscope (FESEM) investigations showed a nearly dense microstructure of the sintered samples. However, the hardness of the pressed-sintered-repressed samples was 81 Vickers which was the highest among the processed specimen. Furthermore, the flexural strength of the PSR and SPS processed samples were 231 and 255 MPa, respectively which were too higher than that of the annealed specimens. The results confirmed the effect of microstructural parameters such as Cr 2 O 3 particle size and processing route on the mechanical properties of the sintered composites.

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“…In recent years, attempts have been made to make refractory phases composites Me (Ag, Cu) using new methods, eg. SPS (Spark Plasma Sintering) [12] and LAM (Laser Additive Manufacturing) technologies [13,14].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Frydman,

Borkowski,

Pietrzak

et al. 2018

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This paper presents technological trials aimed at producing Ag-W, Ag-WC, Ag-W-C and Ag-WC-C composite contact materials and characterizing their properties. These materials were obtained using two methods, i.e. press-sinter-repress (PSR) at the refractory phase content of less than 30% by weight as well as press-sinter-infiltration (PSI) at the refractory phase content of ≥50% by weight). The results of research into both the physical and electrical properties of the outcome composites were shown. They include the analysis of the influence of the refractory phase content (W or WC) on arc erosion and contact resistance changes for the following current range: 6 kA max in the case of composites with a low refractory phase content, 10 kA max in the case of composites with the refractory phase content of ≥50% by weight.

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Novel processing of Ag-WC electrical contact materials using spark plasma sintering

Cited by 35 publications

References 14 publications

Contrastive Research on Electrical Contact Performance for Contact Materials of Cu-SnO2 and Cu-ZnO2 Alloys

Contrastive Research on Electrical Contact Performance for Contact Materials of Cu-SnO2 and Cu-ZnO2 Alloys

Synthesis and characterization of Ag-8 %wt Cr2O3 composites prepared by different densification processes

Archives of Metallurgy and Materials

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