Corrosion resistant cemented carbide

Details Corrosion resistant cemented carbide Corrosion resistant cemented carbide

2000-05-15

2003-02-25

Jenkins, Daniel J. (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

C419S018000

Reexamination Certificate

active

06524364

ABSTRACT:

The present invention relates to corrosion resistant cemented carbide. By using a carefully controlled manufacturing process a cemented carbide with corrosion resistant binder phase and coarse carbide grains has been obtained.
Cemented carbide for corrosion resistance demanding applications such as seal rings, bearings, bushings, hot rolls, etc. generally has a binder phase consisting of Co, Ni, Cr and Mo where the Cr and/or Mo addition acts as corrosion inhibiting additions. An example of such a cemented carbide is disclosed in EP 28 620. A disadvantage with the Cr and/or Mo additions is that they, particularly Cr, also act as grain growth inhibitors which means that it is not possible to make corrosion resistant cemented carbide with a coarse grain size. The above mentioned EP 28620 discloses a WC grain size <2 &mgr;m.


REFERENCES:
patent: 3677772 (1972-07-01), Rymas
patent: 4359335 (1982-11-01), Garner
patent: 4497660 (1985-02-01), Lindholm
patent: 4956012 (1990-09-01), Jacobs et al.
patent: 5041261 (1991-08-01), Buljan et al.
patent: 5151247 (1992-09-01), Haglund et al.
patent: 5310605 (1994-05-01), Baldoni, II et al.
patent: 5593474 (1997-01-01), Keshavan et al.
patent: 5681783 (1997-10-01), Nilson et al.
patent: 5773735 (1998-06-01), Dubensky et al.
patent: 5830256 (1998-11-01), Northrop et al.
patent: 6086650 (2000-07-01), Carpenter
patent: 6241799 (2001-06-01), Galli
ASM Handbook, vol. 7, Powder Metallurgy, pp. 799-800, 1984.*
Derwent Information Services, File 351, Derwent WPI, Dlalog accession No. 008910673, WPI accession No. 92-037942/199205, (Sumitomo Electric Ind Co), “Cemented Carbide for use in mfg. rolling rolls—based on tungsten carbide, contg. cobalt, nickel and chromium”, & JP,A,3285039, 19911216, 199205 B.

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