The results of “Additive (Co, Ni and Zr) Effect on Ag-WC-C Contacts Experimental Procedure”

Materials: plate-grain tungsten carbide, silver powder and additives (Co, Ni and Zr)
Preparation method: chemical coating process, sintering and re-pressing process

The experimental results: Upon examination, the prepared plate-like WC grain of AgWC12C3 contacts own the characteristics of directional arrangement. The adding of Additives (Co powder, Ni powder and Zr powder) significantly improving the interface bonding strength and wettablity of components among Ag, WC and C, and improve the sintering and mechanical properties of the material. AgWC12C3 contacts (silver-based contact materials) hardness, density and conductivity, etc. are significantly improved over AgWC12C3 contacts (spherical tungsten carbide) prepared by conventional powder metallurgy method are much better.

After testing, AgWC12C3 contacts manufactured in" Additive (Co, Ni and Zr) Effect on Ag-WC-C Contacts Experimental Procedure", whose average relative density of 99.6%, average hardness HB = 70.6kg / Mm2, average resistivity Ρ = 2.84μΩ • cm; If use the grain direction which is parallel to the plate-like WC crystal grains direction as the electrical contacts, its contacts conductivity will be higher, its anti-arc resistance property will be stronger, and it will have a longer life. Whereas the AgWC12C3 contacts prepared by mechanical mixing powder method, whose raw material is  spherical tungsten carbide powder, its relative density is only 95.9-98.9%, hardness HB = 56.1-60.2kg / Mm2, resistivity Ρ = 3.18-3.40μΩ • cm.



 

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