Functionally graded cemented tungsten carbide

Details Functionally graded cemented tungsten carbide Functionally graded cemented tungsten carbide

2007-05-24

2009-08-04

Wyszomierski, George (Department: 1793)

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

C419S038000

Reexamination Certificate

active

07569179

ABSTRACT:
The present invention is a method for producing functionally graded materials that contain a hard phase that is embedded in a metal matrix phase. The material have a continuous gradient of a matrix metal phase. An example of these types of materials include functionally graded cemented tungsten carbide (the hard phase) that has a continuous gradient of cobalt (the matrix metal) from one reference position, for example, one surface of a part, to another reference position, for example, the opposite surface of the part or within the part. The functionally graded materials are sintered via a liquid phase sintering (LPS) technique. In order to achieve the desired continuous gradient of the matrix metal, an initial gradient of one of the chemical elements of the hard phase is designed and built into the part prior to liquid phase sintering. The exact gradient of the composition material elements that will be required depends on factors such as the desired final matrix metal gradient, the dimension of the part to be made, and the sintering time and temperature.

REFERENCES:
patent: 3660050 (1972-05-01), Iler et al.
patent: 4610931 (1986-09-01), Nemeth et al.
patent: 4743515 (1988-05-01), Fischer et al.
patent: 5279901 (1994-01-01), Akerman et al.
patent: 5413869 (1995-05-01), Hartzell et al.
patent: 5453241 (1995-09-01), Akerman et al.
patent: 5541006 (1996-07-01), Conley
patent: 5549980 (1996-08-01), Ostlund et al.
patent: 5856626 (1999-01-01), Fischer et al.
patent: 5880382 (1999-03-01), Fang et al.
patent: 6063502 (2000-05-01), Sue et al.
patent: 6214079 (2001-04-01), Kear et al.
patent: 6638474 (2003-10-01), Liu et al.
patent: 6869460 (2005-03-01), Bennett et al.
patent: 6896460 (2005-05-01), Enomoto et al.
patent: 7157148 (2007-01-01), Takai et al.
American Society for Testing and Materials (“Standard Test Method for Apparent Porosity in Cemented Carbides”, Annual Book of ASTM Standards, 1996).
Miyamoto et al. (“Functionally Graded Materials: Design, Processing and Applications”, Book, Kluwer Academic Publishers, 1999).
Put et al. (“Functionally Graded WC-Co Materials Produced by Electrophoretic Deposition”, Scripta Materialia 45 (2001) 1139-1145).
Eso et al., University of Utah Department of Metallurgical Engineering; A New Method for Making Functionally Graded WC-Co Composites via Liquid Phase Sintering; paper presented at PM Tec2 conference in Chicago, Illinois, Jun. 2004.
Eso, Oladapo O., University of Utah Department of Metallurgical Engineering; Sintering Studies of Functionally Graded WC-Co Composites; handout distributed at PM Tec2 conference in Chicago, Illinois, Jun. 2004.
Eso et al., University of Utah Department of Metallurgical Engineering; Liquid Phase Sintering of Functionally Graded WC-Co Composites; to appear in Int. J. of Refractory Metals and Hard Materials, 2005.
Office Action issued for U.S. Appl. No. 11/152,716 on Apr. 19, 2007.
Office Action issued for U.S. Appl. No. 11/152,716 on Sep. 13, 2007.
Interview Summary issued for U.S. Appl. No. 11/152,716 on Oct. 23, 2007.
Office Action issued for U.S. Appl. No. 11/152,716 on Dec. 6, 2007.
Office Action issued for U.S. Appl. No. 11/152,716 on Feb. 12, 2008.
Office Action issued for U.S. Appl. No. 11/152,716 on July 9, 2008.
Office Action issued for U.S. Appl. No. 11/152,716 on Dec. 8, 2008.
Interview Summary issued for U.S. Appl. No. 11/152,716 on Feb. 18, 2009.

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