Tungsten Carbide – Polycrystalline Diamond Buttons (1/2)

Tungsten carbide buttons have higher hardness and excellent impact ductility, which can be widely used in DTH drills for some rock drilling or impact rotary drilling operations. Based on the impact energy supplied by mud pumps, DTH drill uses buttons on the surface of the bit for rock drilling, which drilling depth up to 1000 meters or more, can be achieved in deep drilling and crushing complex formation, so it has strict mechanical properties to tungsten carbide buttons, especially impact resistance. But in some hard abrasive rock drilling, tungsten carbide buttons will be wore easily and leading to failure. Therefore, the process of tungsten carbide button with coatings has come into being.

Tungsten carbide – polycrystalline diamond buttons is a kind of new process, it uses tungsten carbide as substrate and coated with polycrystalline diamond. Tungsten carbide play a supportive role for the polycrystalline diamond, carbide and polycrystalline diamond has a higher hardness and wear resistance, but its impact resistance is lower, which has also become the focus of research related to researchers. In order to improve the impact toughness of tungsten carbide – polycrystalline diamond buttons, foreign researchers have proposed a functionally graded structure composite buttons, carbide diamond layer that is applied between the cemented carbide substrate and the polycrystalline diamond layer the buffer layer can effectively reduce internal stress between the polycrystalline diamond layer and the cemented carbide substrate; Or using polycrystalline silicon or silicon alloy diamond thermal expansion coefficient is closer to penetrate into the pores of pickled diamond, the experiments show that polycrystalline diamond toughness and fracture resistance capacity has been more significant improvement.

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