The role of copper in diamond tool matrix


Among metal-bonded diamond tools, copper and copper-based pre-alloys are the most widely used. Used for diamond saw blades, geological drill bits for metal mines, metal bond grinding wheels, grinding blocks, grinding wheels, thick (thin) wall engineering drill bits, oil drill bits, floor grinding discs, etc. The main behaviors reflected in the carcass are as follows:

The reason why red copper and copper-based pre-alloys are widely used is that copper-based binders (copper-iron pre-alloy, copper-tin alloy, brass, etc.) have satisfactory comprehensive properties, low sintering temperature, good formability and Sinterability and compatibility with other metal elements are excellent.

Although Cu hardly wets diamond, the alloying of certain elements with copper can greatly improve the wettability of diamond. For example, one of Cu and carbide forming elements Cr, Ti, W, V, Fe, etc. is made into Cu alloy, which can greatly reduce the wetting angle of copper alloy to diamond.

① Cupronickel alloy has higher strength than bronze and brass.

② Bronze alloy has the lowest wetting angle to diamond (graphite) and is most used in diamond tools.

③ The strength of brass is between the two.

Cu forms various solid solutions with Ni, Co, Mn, Sn, Zn, etc. to strengthen the base metal.

The wetting of copper to framework materials such as W, WC, and TiC is much better than that of diamond.

In copper-based alloys, the addition of Ni can be infinitely miscible with Cu, which can strengthen the matrix alloy, inhibit the loss of low melting point metals, and increase toughness and wear resistance.

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