Rock bit with cobalt alloy cemented tungsten carbide inserts

Details Rock bit with cobalt alloy cemented tungsten carbide inserts Rock bit with cobalt alloy cemented tungsten carbide inserts

1992-09-14

1994-04-26

Bui, Thuy M.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

175375, E21B 1000

Patent

active

053058402

ABSTRACT:
A rock bit employs cemented tungsten carbide inserts for engaging a rock formation for drilling oil wells or the like. The cemented tungsten carbide inserts have as a binder phase a cobalt base alloy including from 10 to 35% by weight nickel, from 3 to 10% by weight chromium, from 1 to 6% by weight of molybdenum, and a balance primarily of cobalt. A particularly preferred composition has 6% by weight chromium, 17% by weight nickel, 4% by weight molybdenum and a balance of cobalt. Wear resistance is enhanced without loss of toughness in the inserts.

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S. Ekemar, et al., "Nickel As a Binder in WC-Based Cemented Carbides", Paper Presented at the 10th Plansee Seminar, Reutte, Jun. 1981, 4 pages.
W. Precht, et al., "Abrasion Resistance of Cermets Containing Co/Ni Binders" Martin Marietta Laboratories, pp. 815-828.
Nishigaki, et al., Binder Phase Strengthening Through v' Precipitation of "WC-Co-Ni-Cr-Al Hard Alloys", HM #), pp. 487-508.
C. H. Vasel, et al., "Binder Deformation in WC-(Co,Ni) Cemented Carbide Composites", Metallurgical Transactions A--vol. 16A, Dec. 1985, pp. 2309-2317.
Luo Zhonglin, "Improved Carbide Cutting Tools for Machining of Difficult Materials", MPR, Dec. 1987, pp. 846-848.
Masumoto, et al., "Corrosion Resistance of Cemented Carbide", Nippon Tungsten Review, vol. 19 (1986) pp. 26-32.

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