STRUCTURAL-PHASE STATE AND PROPERTIES OF TUNGSTEN-COPPER-COBALT ALLOY MODIFIED BY NANO-SIZED CARBON ADDITIVE
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Abstract
The mechanism of the formation of the structure and properties of the tungsten-copper-cobalt alloy by nanosized carbon additive is studied. It was found that, the chemical interaction of the carbon with the Co and WC melt occurs during the electrocontact sintering of the modified alloy of the WC–Cu–Co system, which results in an increase in the content of the carbide phase Co6W6C and the decrease of the grain size of WC carbide and Co6W6C double carbide. The relationship of the mechanical and tribotechnical properties of the modified tungsten-copper-cobalt binder with the concentration of nanosized carbon additives is established. It is shown that the use of the modified tungsten-copper cobalt alloy as a metal bond of a diamond tool (straightening pencils, cutting wheels) increases the tool life by 1.5–1.6 times.
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