NDLI: Improved Workability of the Nanocomposited AgSnO$_{2}$ Contact Material and Its Microstructure Control During the Arcing Process

Content Provider	Springer Nature Link
Author	Wang, Yaping Li, Haiyan
Copyright Year	2016
Abstract	There are two major weaknesses for the AgSnO$_{2}$ contacts used in the low voltage switch devices. One is poor workability, which causes the AgSnO$_{2}$ materials to hardly deform into the required shape. Another is the increased contact resistance after arcing, which, in turn, causes an unfavorable temperature rise in the switches. In this article, the nanocomposited AgSnO$_{2}$ materials were developed to overcome the weaknesses. The nanosized SnO$_{2}$ powders with or without CuO additive were prepared by the chemical precipitation method. The SnO$_{2}$ powders and Ag powders were high energy milled together to obtain AgSnO$_{2}$ composite powders, which were then sintered, hot pressed and extruded. It was found that the SnO$_{2}$ particles mainly distribute in the interior of Ag grains with Ag film on the grain boundary. The hardness of AgSnO$_{2}$ composites and the wetting angle of Ag melt on SnO$_{2}$ particles decreased with the addition of a small amount of CuO. By the combining effect of Ag film on grain boundary and the addition of CuO, the elongation and workability of the AgSnO$_{2}$ materials improved. The experiments of rapid solidification revealed that more SnO$_{2}$ particles with CuO addition were engulfed in the Ag matrix than those without CuO, which inhibited the redistribution of SnO$_{2}$ particles on the contact surface during the arcing process. The industrial type test in the 45A contactor suggested that the nanocomposited AgSnO$_{2}$ materials are suitable to be used as contacts in low voltage switches.
Starting Page	609
Ending Page	616
Page Count	8
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	48
Issue Number	2
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2016-11-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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