Articles Having Improved Resistance to Thermal Cracking

An article selected from an earth boring bit, a cutting insert, a cutting tool, a rotary tool, a rotary tool insert, a drill, a knife, and a slitter, wherein the article comprises:

• a cutting portion comprising cemented carbide including hard particles of carbides of at least one transition metal selected from titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and a binder comprising at least one of cobalt, nickel, and iron, the cutting portion including a cutting surface;
• a body portion supporting the cutting portion;
• and
• a heat sink portion contacting the body portion and comprising a material including at least one of copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, aluminum silicon carbide, beryllium oxide, silicon-silicon carbide, aluminum silicon carbide, copper tungsten alloys, copper molybdenum carbides, carbon, diamond, and graphite and having a thermal conductivity greater than a thermal conductivity of the cemented carbide, wherein the heat sink portion is in thermal communication with and conducts heat away from the working portion.

A rolling mill roll comprising:

• a contact portion comprising cemented carbide including hard particles of carbides of at least one transition metal selected from titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and a binder comprising at least one of cobalt, nickel, and iron, the contact portion further comprising
• a first end and an opposed second end, and
• an annular outer wall extending between the first end and the second end and comprising a contact surface;
• a body portion supporting the contact portion and comprising an annular inner wall defining a bore extending longitudinally through the rolling mill roll, the inner wall comprising a recess therein;
• and
• a heat sink portion in contact with the body portion and comprising a material including at least one of copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, aluminum silicon carbide, beryllium oxide, silicon-silicon carbide, aluminum silicon carbide, copper tungsten alloys, copper molybdenum carbides, carbon, diamond, and graphite, and having a thermal conductivity greater than a thermal conductivity of the cemented carbide, wherein at least a portion of the heat sink portion is disposed within the recess, and further wherein the heat sink portion is in thermal communication with and conducts heat away from the working portion.

A seal ring comprising:

• a contact portion comprising cemented carbide including hard particles of carbides of at least one transition metal selected from titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and a binder comprising at least one of cobalt, nickel, and iron, the contact portion further comprising a first face comprising a contact surface;
• a body portion supporting the contact portion and comprising a second face defining a recess therein, wherein an annular inner wall extends between the first face and the second face and defines a bore extending between and opening on the first face and the second face;
• and
• a heat sink portion comprising a material including at least one of copper, aluminum, silver, gold, silicon carbide, aluminum nitride, boron nitride, aluminum silicon carbide, beryllium oxide, silicon-silicon carbide, aluminum silicon carbide, copper tungsten alloys, copper molybdenum carbides, carbon, diamond, and graphite, and having a thermal conductivity greater than a thermal conductivity of the cemented carbide, wherein at least a portion of the heat sink portion is disposed within the recess, and further wherein the heat sink portion is in thermal communication with and conducts heat away from the working portion.