ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Silver metal oxides (Ag/MeO) are extensively used as electrical contact materials in switchingsystems. A contact material with ideal operating parameters is very difficultly fabricated by conventionalmanufacturing techniques. In this paper, a new electrical contact material characterized by gradeddistributions of different oxides in Ag matrix was fabricated in order to optimize the distributions ofoperating parameters in material bulk instead of to enhance synchronously properties of that on contactsurface. Two selected metal oxides, NiO and SnO2, were doped into Ag matrices, of which one surfacelayer NiO 12wt% was doped and another SnO2 12wt%, and the concentrations of NiO and SnO2 werevaried gradually in bulk. The electrical contact test results show that the average operating number of NiOdoped surface layer of graded Ag composite as contact surface is 4600 under 20A current and 220V ACvoltage without melted welding while that of samples doped uniformly with NiO is 2200 under the sametesting conditions. However, the average loss of mass due to arc erosion of graded samples is higher thanthat of uniform samples. We conclude that the functionally graded material (FGM) concept has potentialapplication for electric contact materials
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2616.pdf
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