Method of bonding by use of a phosphorus containing coating
OwnerPeter N. Tomlinson, Klaus Tank +1inventors
InventorsPeter N. Tomlinson, Klaus Tank, Karl Schrittwieser
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Abstract
A method of bonding a cemented carbide surface to a metal surface is provided. The method involves applying an alloy layer to one or both of the surfaces, the alloy comprising a major amount of nickel or copper and a minor amount of phosphorus, heat treating the alloy layer below its liquidus temperature to cause it to diffusion bond to the surface top to which it is applied and bonding the surfaces together by means of a solder or braze alloy which preferably has a liquidus of no more than 750.degree. C. The method has particular application to bonding cutting inserts to drill bits and cutting tools for mining machines.
Claims11
A method of bonding a cemented carbide surface to a metal surface, including the steps of applying an alloy layer to one or both of the surfaces, the alloy comprising a major amount of nickel or copper and a minor amount of phosphorus, heat treating each said alloy layer at a temperature of from 500.degree. to 1200.degree. C. for a time of from 5 to 300 minutes, said temperature being below the liquidus of said alloy but sufficiently high that said heat treatment results in the alloy's diffusing substantially into the surface to which it is applied thereby to cause diffusion bonding between the surface and the alloy, and bonding the surfaces together by means of a solder or braze alloy.
Dependencies are inferred from the claim text.