Stock material or miscellaneous articles – Composite – Of metal
Patent
1997-07-31
2000-05-16
Jones, Deborah
Stock material or miscellaneous articles
Composite
Of metal
428698, 428408, 175425, 175426, 175434, B22F 300, C22C 109
Patent
active
060635029
ABSTRACT:
In one embodiment, composite constructions of the invention are in the form of a plurality of coated fibers bundled together to produce a fibrous composite construction in the form of a rod. Each fiber has a core formed from a hard phase material, that is surrounded by a shell formed from a binder phase material. In another embodiment of the invention, monolithic sheets of the hard phase material and the binder phase material are stacked and arranged to produce a swirled composite in the form of a rod. In still another embodiment of the invention, sheets formed from coated fibers are arranged to produce a swirled composite. Inserts for use in such drilling applications as roller cone rock bits and percussion hammer bits, and shear cutters for use in such drilling applications as drag bits, that are manufactured using conventional methods from these composite constructions exhibit increased fracture toughness due to the continuous binder phase around the hard phase of the composites. These binder phases increase the overall fracture toughness of the composite by blunting or deflecting the tip of a propagating crack.
REFERENCES:
patent: 4772524 (1988-09-01), Cobienz
patent: 5419878 (1995-05-01), Honnorat
patent: 5492186 (1996-02-01), Overstreet et al.
patent: 5645781 (1997-07-01), Popovic' et al.
Technological Advances, Flaw Tolerant, Fracture Resistant, Non-Brittle Materials PRoduced via Conventional Powder Processing, 1995 Matrice Technology Ltd., pp. 131-134.
Advance Ceramics Research, Research & Development Summaries, Aug. 18, 1996.
Fang Zhigang
Rai Ghanshyam
Sue J. Albert
Jones Deborah
Savage Jason
Smith International Inc.
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