The Contact Resistance and Arc Erosion Behavior of Separable CP-Nb-Cr/Cu-Cd Electrical Contact Material

2007 ◽  
Vol 353-358 ◽  
pp. 886-889 ◽  
Author(s):  
Yu Sheng Cui ◽  
Liang Zhen ◽  
Y. Wang ◽  
Wen Zhu Shao ◽  
V.V. Ivanov
Keyword(s):  
Surface Layer ◽  
Contact Resistance ◽  
Electrical Contact ◽  
Composition Analysis ◽  
Contact Material ◽  
Arc Erosion ◽  
Electrical Arc ◽  
Electrical Contact Material ◽  
Microstructure Observation ◽  
Powder Metallurgy Process

CP-Nb-Cr/Cu-Cd electrical contact material, which contains 1.7wt.% of Cd, 0.5wt.% of CP (man-made diamond particles), 2.0 wt.% of Nb and 0.7 wt.% of Cr, was fabricated by powder metallurgy process. The contact material was installed in different ac contactors covering current range from 40 to 630A. While tested under AC-4 electrical load, the electrical contact material was worn out gradually by repeated electrical arc, and microstructure of the arc-affected surface layer changed dramatically. Mechanism of arc erosion process and contact resistance fluctuation was discussed by corresponding microstructure observation and chemical composition analysis of the surface layer. CP-Nb-Cr/Cu-Cd electrical contact material is capable to be used in 63~250A ac contactors under AC-4 working conditions.

Arc erosion behavior and mechanism of Cu/Cr20 electrical contact material

Vacuum ◽  
2017 ◽  
Vol 143 ◽  
pp. 129-137 ◽  
Author(s):  
Shunxin Zhu ◽  
Yong Liu ◽  
Baohong Tian ◽  
Yi Zhang ◽  
Kexing Song
Keyword(s):  
Electrical Contact ◽  
Contact Material ◽  
Arc Erosion ◽  
Erosion Behavior ◽  
Electrical Contact Material

A New Silver-Based Graded Composite as Electrical Contact Material

2007 ◽  
Vol 336-338 ◽  
pp. 2616-2618 ◽  
Author(s):  
Lu Wang ◽  
Yong Zhao ◽  
X.T. Zhu ◽  
Y. Wang
Keyword(s):  
Surface Layer ◽  
Metal Oxides ◽  
Contact Surface ◽  
Electrical Contact ◽  
Functionally Graded ◽  
Operating Parameters ◽  
Contact Material ◽  
Contact Materials ◽  
Electrical Contact Material ◽  
Graded Material

Silver metal oxides (Ag/MeO) are extensively used as electrical contact materials in switching systems. A contact material with ideal operating parameters is very difficultly fabricated by conventional manufacturing techniques. In this paper, a new electrical contact material characterized by graded distributions of different oxides in Ag matrix was fabricated in order to optimize the distributions of operating parameters in material bulk instead of to enhance synchronously properties of that on contact surface. Two selected metal oxides, NiO and SnO2, were doped into Ag matrices, of which one surface layer NiO 12wt% was doped and another SnO2 12wt%, and the concentrations of NiO and SnO2 were varied gradually in bulk. The electrical contact test results show that the average operating number of NiO doped surface layer of graded Ag composite as contact surface is 4600 under 20A current and 220V AC voltage without melted welding while that of samples doped uniformly with NiO is 2200 under the same testing conditions. However, the average loss of mass due to arc erosion of graded samples is higher than that of uniform samples. We conclude that the functionally graded material (FGM) concept has potential application for electric contact materials.

scholarly journals Silver-Ruthenium Dioxide Contacts

1976 ◽  
Vol 2 (4) ◽  
pp. 259-261 ◽  
Author(s):  
D. J. Pedder
Keyword(s):  
Contact Resistance ◽  
Electrical Contact ◽  
Ruthenium Oxide ◽  
Ruthenium Dioxide ◽  
Contact Material ◽  
Pure Silver ◽  
Electrical Contact Material ◽  
Light Duty ◽  
Material Fabrication

This paper describes the development of a novel electrical contact material, silver-ruthenium oxide, for use in light duty switching applications where low contact resistance values must be maintained. Material fabrication and contact resistance behaviour after exposure to a tarnishing atmosphere are described. An explanation for the low contact resistance values obtained for silver-ruthenium dioxide in comparison with pure silver is offered.

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