Articles having improved resistance to thermal cracking

A seal ring comprising:

• a working portion comprising cemented carbide including a binder and hard particles of carbides of at least one transition metal selected from titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten;
• a body portion supporting the working portion and including an inner portion including a recess;
• and
• a heat sink portion comprising a heat sink material 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 from the working portion and at least a portion of the heat sink portion is in the recess;
• wherein the working portion includes a contact portion comprising a first face comprising a contact surface;
• and
• a body portion supporting the contact portion and comprising a second face defining a recess therein, wherein an annular outer wall extends between the first face and the second face, and an annular inner wall extends between the first face and the second face and defines a bore extending between an opening on the first face and the second face.

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, wherein the body portion includes an interior portion including a recess;
• 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 alloy, copper molybdenum carbide, 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 cutting portion and at least a portion of the heat sink portion is in the recess wherein the cutting portion is an outer portion and the heat sink portion is a central core 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 longitudinal 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 alloy, copper molybdenum carbide, 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 longitudinal recess, and further wherein the heat sink portion is in thermal communication with and conducts heat away from the contact 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 an 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 alloy, copper molybdenum carbide, 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 contact portion.

A method of making an article, comprising:

• providing a working portion comprising cemented carbide, the cemented carbide comprising 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;
• providing a body portion supporting the working portion and including an interior portion including a recess;
• and
• providing a heat sink portion and disposing at least a portion of the heat sink portion in the recess, wherein the heat sink portion is in thermal communication with the working portion and comprising a heat sink material having a thermal conductivity greater than a thermal conductivity of the cemented carbide wherein the working portion is an outer portion and the heat sink portion is a central core portion.

A method of making an article, comprising:

• providing a working portion comprising cemented carbide, the cemented carbide comprising 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;
• providing a body portion supporting the working portion and including an inner portion including a recess;
• and
• providing a heat sink portion and disposing at least a portion of the heat sink portion in the recess, wherein the heat sink portion is in thermal communication with the working portion and comprising a heat sink material having a thermal conductivity greater than a thermal conductivity of the cemented carbide;
• wherein providing a working portion and providing a body portion comprises partially filling a void of a mold with a cemented carbide powder;
• and
• wherein providing a heat sink portion comprises disposing the heat sink material in the void, wherein the heat sink material is a solid and has a melting point greater than the sintering temperature of the cemented carbide powder;
• and
• wherein the cemented carbide powder and the heat sink material are heated at a sintering temperature of the cemented carbide powder and the sintering temperature is less than a melting temperature of the heat sink material.