Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable bit
Patent
1995-12-21
1998-09-15
Bagnell, David J.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable bit
175428, E21B 1052, E21C 35183
Patent
active
058069348
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 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.
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Conley Edward V.
Massa Ted R.
Van Kirk John S.
Antolin Stanislav
Bagnell David J.
Kennametal Inc.
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