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US 8,617,289 B2Granted
Hardfacing compositions for earth boring tools
AssigneeSmith International, Inc.
InventorsAlan W. Lockstedt, Gregory T. Lockwood
Life of this patent
Estimating the term…
Abstract
A hardfacing composition essentially consisting of from about 50 to 75 percent by weight of a carbide phase having a particle size distribution of ±20% or less of a median particle size; and from about 25 to 50 percent by weight of binder phase is disclosed. Drill bits having such hardfacing compositions disposed thereon are also disclosed.
Claims24
A hardfacing composition consisting essentially of:
- from about 50 to 75 percent by weight of a carbide phase having a plurality of carbide particles with a particle size distribution of ±20% or less of a median particle size;
- wherein the plurality of carbide particles are of the same chemical composition or of the same shape;
- and
- from about 25 to 50 percent by weight of binder phase.
1 more element
A hardfacing composition consisting essentially of:
- from about 50 to 75 percent by weight of a carbide phase, wherein 90% of the carbide phase have a plurality of carbide particles with a particle size within 20% or less of a median particle size of the carbide phase;
- wherein the plurality of carbide particles are of the same chemical composition or of the same shape;
- and
- from about 25 to 50 percent by weight of binder phase.
1 more element
A roller cone drill bit, comprising:
- a bit body;
- and
- at least one roller cone rotatably mounted to the bit body, the at least one roller cone comprising at least one cutting element, the at least one cutting element having a hardfacing composition on at least an exterior surface, the hardfacing composition consisting essentially of:
- a plurality of carbide particles having a particle size distribution of ±20% or less of a median particle size;
- wherein the plurality of carbide particles are of the same chemical composition or of the same shape;
- and
- a binder phase.
4 more elements
A roller cone drill bit, comprising:
- a bit body;
- and
- at least one roller cone rotatably mounted to the bit body, the at least one roller cone comprising at least one cutting element, the at least one cutting element having a hardfacing on at least an exterior surface, the hardfacing comprising a plurality of carbide particles separated by a binder phase, wherein the plurality of carbide particles have a mean free path of at least 40 microns, and wherein the plurality of carbide particles are of the same chemical composition or of the same shape.
A drill bit, comprising:
- a bit body having at least one blade thereon;
- at least one cutter pocket disposed on the at least one blade;
- at least one cutter disposed in the at least one cutter pocket;
- and
- a hardfacing disposed on at least an exterior surface of the bit body, the hardfacing composition consisting essentially of:
- a plurality of carbide particles having a particle size distribution of ±20% or less of a median particle size, wherein the plurality of carbide particles are of the same chemical composition or of the same shape;
- and
- a binder phase.
5 more elements
A drill bit, comprising:
- a bit body having at least one blade thereon;
- at least one cutter pocket disposed on the at least one blade;
- at least one cutter disposed in the at least one cutter pocket;
- and
- a hardfacing disposed on at least an exterior surface of the bit body, the hardfacing comprising a plurality of carbide particles separated by a binder phase, wherein the plurality of carbide particles have a mean free path of at least 40 microns, and wherein the plurality of carbide particles are of the same chemical composition or of the same shape.
2 more elements
Dependencies are inferred from the claim text.