Composite cermet articles and method of making

Details Composite cermet articles and method of making Composite cermet articles and method of making

1995-12-21

1998-07-07

Turner, Archene

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

51295, 51307, 51309, 428328, 428336, 428472, 428698, C22C 2908

Patent

active

057765936

ABSTRACT:
Methods for making, methods for using and articles comprising cermets, preferably cemented carbides and more preferably tungsten carbide, having at least two regions exhibiting at least one property that differs are discussed. Preferably, the cermets further exhibit uniform or controlled wear to impart a self-sharpening character to an article. The multiple-region cermets are particularly useful in wear applications. The cermets are manufactured by juxtaposing and densifying at least two powder blends having different properties (e.g., differential carbide grain size or differential carbide chemistry or differential binder content or differential binder chemistry or any combination of the preceding). Preferably, a first region of the cermet comprises a first ceramic component having a relatively coarse grain size and a prescribed binder content and a second region, juxtaposing or adjoining the first region, comprises a second ceramic component, preferably carbide(s), having a grain size less than the grain size of the first region, a second binder content greater than the binder content of the first region or both. These articles have an extended useful life relative to the useful life of monolithic cermets in such applications as, for example, wear. The multiple region cermets of the present invention may be used with articles comprising tools for materials manipulation or removal including, for example, mining, construction, agricultural, and metal removal applications.

REFERENCES:
patent: 4484644 (1984-11-01), Cook et al.
patent: 5484191 (1996-01-01), Sollami
patent: 5543235 (1996-08-01), Mirchandani et al.
patent: 5593474 (1997-01-01), Keshavan et al.
Viswanadham, R.K., "Stability of Microstructural Discontinuities in Cemented Carbides," International Journal of Powder Metallurgy, Oct. 1987, USA, vol. 23, No. 4, ISSN 0361-3488, pp. 229-235.
Richter, V., "Fabrication and Properties of Gradient Hard Metals," 3rd International Symposium on Structural and Functional Gradient Materials, Proceedings of FGM '94, Lausanne, Switzerland, 10-12 Oct. 1994, 1995, Lausanne, Switzerland, Presses Polytech. Univ., Romandes, Switzerland, whole document.

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