Tungsten Carbide Button with Increased Wear Resistance

In U.S. Pat. No. 4,743,515, tungsten carbide buttons are disclosed with a core of finely and evenly distributed eta-phase embedded in the normal alpha+beta-phase structure, and a surrounding surface zone of only alpha+beta-phase. (alpha=tungsten carbide, beta=metal binder, e.g., Co, and eta=M₆ C, M₁₂ C and other carbides, e.g., Co₃ W₃ C). In the inner part of the surface zone situated close to the core of that body, the Co-content is higher than the nominal content of Co. The Co-content in the outermost part of the surface zone is lower than the nominal and increases in the direction towards the core up to a maximum usually at the eta-phase core.

Tungsten carbide button for rock drilling comprises a core and a surface zone surrounding the core whereby both the surface zone and the core contains WC (alpha-phase) and a binder phase based on at least one of Co, Ni, or Fe and the core in addition contains eta-phase. The eta-phase core extends to the very top (working) surface of the button and as a result is obtained longer life and higher drilling rate particularly for rotating crushing drilling, cutting drilling and percussive drilling in soft rocks.


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