发明授权
US07810587B2 Drill bits comprising dual-phase tungsten carbide material 有权
钻头包括双相碳化钨材料

Drill bits comprising dual-phase tungsten carbide material
摘要:
The invention relates to a drill bit containing tungsten carbide powder having powder particles which have a core of cast tungsten carbide and a shell of tungsten monocarbide.
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