Hardfacing composition for earth-boring bits
AssigneeBaker Hughes Incorporated
InventorsKevin W. Schader, Ronald L. Jones, James L. Overstreet, Danny E. Scott, Mou-Chih Lu, Alan J. Massey
Life of this patent
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Abstract
A hardfacing composition comprises at least 60% by weight of hard metal granules including a quantity of sintered carbide pellets and a quantity of cast carbide pellets. The cast and sintered carbides are selected from the group of carbides consisting of chromium, molybdenum, niobium, tantalum, titanium, tungsten, and vanadium carbides and alloys and mixtures thereof. The balance of the hardfacing composition is matrix metal with traces of flux or deoxidizer, and alloying elements. All percentages given are pre-application ratios.
Claims18
An improved, wear-resistant hardfacing composition comprising the following materials in pre-application ratios:
- at least 60% by weight of the composition being granules including a quantity of sintered carbide pellets and a quantity of cast carbide pellets, the cast and sintered carbides being selected from one of the group of carbides consisting of chromium, molybdenum, niobium, tantalum, titanium, tungsten, and vanadium carbides and alloys and mixtures thereof;
- the balance of the hardfacing composition being matrix metal.
An improved earth-boring bit hardfacing composition comprising, in pre-application ratios:
- about 41-49% by weight spherical sintered carbide pellets;
- about 8-12.8% by weight spherical cast carbide pellets;
- about 8-12.8% by weight crushed sintered carbide particles;
- and
- a balance of the composition matrix metal.
An improved earth-boring bit hardfacing composition comprising, in pre-application ratios:
- about 41-49% by weight spherical sintered tungsten carbide pellets;
- about 8-12.8% by weight spherical cast tungsten carbide pellets;
- about 8-12.8% by weight crushed sintered tungsten carbide particles;
- and
- a balance of the composition matrix metal in the form of a tube containing the cast and sintered carbide particles and pellets.
Dependencies are inferred from the claim text.