Cemented carbide body for rock drilling mineral cutting and highway engineering
AssigneeSandvik AB
InventorsStefan S. O. Ederyd, E. K. Staffen Soderberg, Udo K. R. Fischer
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Abstract
The invention relates to a coated cemented carbide body for rock drilling having a substrate containing at least one metal carbide and a binder metal and an at least partly covering coating comprising at least one diamond- or cBN-layer applied by CVD- or PVD-technique. The cemented carbide body has a core of cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.
Claims17
A method of coating a cemented carbide body for rock drilling having a substrate containing at least one metal carbide and a binder metal, the body including a core containing eta-phase and a surface zone free of eta-phase, the method comprising:
- heat treating the substrate such that the cemented carbide body includes a zone of compressive stresses;
- and
- depositing a coating comprising at least one diamond- or cBN-layer on the zone of compressive stresses by CVD- or PVD- methods.
Dependencies are inferred from the claim text.