Tungsten Carbide Rock Drill Button Friction Test

Tungsten carbide is the most common material for rock drilling due to its superior combination of toughness and hardness. To elucidate the relationship between the known wear behavior against different rock types and the corresponding sliding friction performance, a tungsten carbide rock drill button friction test series has been performed. A tungsten carbide rock drill button with 94-wt.% WC and 6-wt.% Co was sliding against polished granite, magnetite, hematite, quartzite, mica schist, leptite and sandstone in a pin-on-disc tribometer. The test was performed in 25 °C and 350 °C air and also in 25 °C water. The load was chosen to 20 N (which is considerably lower than required for crushing the rock) and the sliding velocity was 0.26 m/s.

At 25 °C, the tungsten carbide exhibited the highest stable dry friction against mica schist, and the lowest against leptite. At 350 °C, leptite gave the highest friction and hematite the lowest. In water, granite showed the highest friction and quartzite the lowest.

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