Cemented Carbide Rock Drill

WC/Co cemented carbide is the most common material for rock drilling due to its superior combination of toughness and hardness. A cemented 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. When 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. The relationship between the known wear behaviour against different rock types and the corresponding sliding friction performance is listed as follows,

At 25 °C, the cemented 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. A “remaining water lubricant effect” was noticed where mica schist was able to keep low, water lubricated friction value even when seemingly run dry, while leptite, sandstone and hematite were not.

 
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