Abstract
AbstractThe literature concerning the wear of tungsten carbide-cobalt alloys used as tool bits in rock drilling is surveyed. The possible mechanisms of rock breakage and of tool wear are briefly discussed. Wear takes place as a result of shock impact or impact-fatigue spalling, by abrasion-mainly from the quartz grains in the rock, and also by thermal fatigue. The mechanism that dominates in any given conditions depends on the method of drilling and on the strength and abrasiveness of the rock. For rotary-percussive drilling, impact-fatigue wear and abrasion operate simultaneously,though essentially independently.Published data on the relations between the wear of WC-Co alloys in rock drilling and their structure and properties are critically discussed. It appears that the resistance to impact wear is a direct function of the bulk compressive or transverse rupture strength and is related to the WC grain size and the Co mean free path. It is directly proportional to the blow energy in percussion. The resul...
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