Method of producing abrasive compacts

Claim 1

A method of bonding a diamond or cubic boron nitride abrasive compact to a second such compact or to a cemented carbide support including the steps of depositing a layer of a transition metal on the first compact in unbonded condition, depositing a layer of a braze alloy on the transition layer in unbonded condition, the braze alloy having a melting point in the range 650° C. to 750° C. and being capable of alloying with the transition metal, then, with the two layers unbonded to each other and the first compact, placing the second compact or carbide support on the braze layer; and heating the thus-formed unbonded assembly at a temperature between 650° C. and 750° C. for a period of 2 to 180 minutes with the first and second compacts clamped together at a pressure of between 72.5 and 1450 lbs/sq. inch to produce an alloy bonding layer bonding the first compact to the second compact or carbide support.

Claim 2

A method of bonding a diamond or cubic boron nitride abrasive compact to a second such compact or to a cemented carbide support including the steps of depositing a layer of a transition metal on the first compact in unbonded condition, depositing a layer of a braze alloy on the transition layer in unbonded condition, the braze alloy having a melting point in the range 650° C. to 750° C. and being capable of alloying with the transition metal, then, with the two layers unbonded to each other and the first compact, placing the second compact or carbide support on the braze layer; and heating the thus-formed unbonded assembly at a temperature between 650° C. and 750° C. for a period of 2 to 180 minutes with the first and second compacts clamped together at a pressure of between 72.5 and 1450 lbs/sq. inch to produce an alloy bonding layer bonding the first compact to the second compact or carbide support.

Claim 15

A method of bonding a diamond compact to a cemented carbide support including the steps of depositing a powdered transition metal layer of thickness 10 to 100 microns on the first compact in unbonded condition, depositing a layer of thickness 0.05 to 0.5 mm of a braze alloy on the transition layer in unbonded condition, the braze alloy consisting predominantly of one or more of the metals gold, silver and copper, having a melting point in the range 650° C. to 750° C. and being capable of alloying with the transition metal, then, with the to layers unbonded to each other and the first compact, placing the carbide support on the braze layer; and heating the thus-formed unbonded assembly to a temperature of 650° C. to 750° C. and maintaining the elevated temperature, once reached, for a period of 2 to 180 minutes with the first and second compacts clamped together at a pressure of between 72.5 and 1450 lbs/sq. inch to produce an alloy bonding layer bonding the first compact to the carbide support.

Claim 16

A method of bonding a diamond compact to a cemented carbide support including the steps of depositing a powdered transition metal layer of thickness 10 to 100 microns on the first compact in unbonded condition, depositing a layer of thickness 0.05 to 0.5 mm of a braze alloy on the transition layer in unbonded condition, the braze alloy consisting predominantly of one or more of the metals gold, silver and copper, having a melting point in the range 650° C. to 750° C. and being capable of alloying with the transition metal, then, with the to layers unbonded to each other and the first compact, placing the carbide support on the braze layer; and heating the thus-formed unbonded assembly to a temperature of 650° C. to 750° C. and maintaining the elevated temperature, once reached, for a period of 2 to 180 minutes with the first and second compacts clamped together at a pressure of between 72.5 and 1450 lbs/sq. inch to produce an alloy bonding layer bonding the first compact to the carbide support.