# US 8,783,384 B2 · Fiber-containing diamond-impregnated cutting tools and methods of forming and using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,384 B2 - Document ID: US8783384B2 - Status: Granted - Kind: B2 - Application number: 13/477,989 - Filed: 2012-05-22 - Published: 2012-09-13 - Granted: 2014-07-22 - Earliest claimed: 2006-11-30 - Assignees: Longyear TM, Inc. - Applicants: Kristian S. Drivdahl; Michael D. Rupp - Inventors: Kristian S. Drivdahl; Michael D. Rupp - Web page: https://patentgrep.com/patent/US8783384B2 ## CPC - E21B 10/5735: {Interface between the substrate and the cutting element} - B22F 7/08: with one or more parts not made from powder {(B22F7/062 takes precedence)} - B24D 3/06: metallic {or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements} - B32B 15/011: {all layers being formed of iron alloys or steels} - B32B 15/013: {one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium} - C22C 26/00: Alloys containing diamond {or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes} - E21B 10/48: the bit being of core type - B22F 2005/001: {Cutting tools, earth boring or grinding tool other than table ware} - Y10T 408/81: Tool having crystalline cutting edge - Y10T 408/89: Tool or Tool with support - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C22C: ALLOYS (treatment of alloys C21D, C22F) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Fibers for diamond-impregnated cutting tools and their associated methods for manufacture and use are described. A matrix is formed that contains fibers made from carbon, glass, ceramic, polymer, and the like. The matrix is then sintered to form a cutting portion of a drill bit. The type and concentration of the fibers can be modified to control the tensile strength and the erosion rate of the matrix to optimize the cutting performance of the tools. Additionally, the fibers may be added to the cutting section to weaken the structure and allow higher modulus binders to be used for the cutting tools at a lower cost, allowing the amount of fibers to be tailored to retain the diamonds in the cutting portion for the desired amount. As the cutting portion erodes, the fibers may also increase the lubricity at the face of the cutting portion. ## Claims ### Claim 1 A cutting tool comprising a cutting section, the cutting section comprising: a matrix of hard particulate material; a binder infiltrated within the matrix of hard particulate material; a plurality of cutting media dispersed within the matrix of hard particulate material; and a plurality of fibers dispersed within the matrix of hard particulate material, wherein the plurality of fibers are about 10 to about 25,000 microns long and have a diameter of between about 1 micron and about 500 microns. ### Claim 2 (depends on 1) The cutting tool of claim 1, wherein the hard particulate material of the matrix comprises one or more of tungsten carbide, tungsten, iron, cobalt, or molybdenum. ### Claim 3 (depends on 1) The cutting tool of claim 1, wherein the binder comprises one or more of copper, zinc, silver, molybdenum, nickel, cobalt, or alloys thereof. ### Claim 4 (depends on 1) The cutting tool of claim 1, wherein the cutting media are disposed homogeneously within the cutting tool. ### Claim 5 (depends on 1) The cutting tool of claim 1, wherein the plurality of cutting media comprises diamond crystals. ### Claim 6 (depends on 1) The cutting tool of claim 1, wherein the plurality of fibers is selected from the group consisting of: carbon fibers, metal fibers, glass fibers, polymeric fibers, ceramic fibers and coated fibers. ### Claim 7 (depends on 6) The cutting tool of claim 6, wherein the metal fibers comprise tungsten fibers, tungsten carbide fibers, iron fibers, molybdenum fibers, cobalt fibers, or combinations thereof. ### Claim 8 (depends on 1) The cutting tool of claim 1, wherein the plurality of fibers are at least partially coated with metal, glass, ceramic, or combinations thereof. ### Claim 9 (depends on 8) The cutting tool of claim 8, wherein the plurality of fibers are coated to a desired thickness. ### Claim 10 (depends on 1) The cutting tool of claim 1, wherein the cutting tool comprises a drill bit. ### Claim 11 (depends on 10) The cutting tool of claim 10, wherein the cutting tool comprises a core sampling drill bit. ### Claim 12 (depends on 1) The cutting tool of claim 1, wherein the hard particulate material of the matrix comprises tungsten carbide. ### Claim 13 (depends on 1) The cutting tool of claim 1, wherein the binder comprises copper alloy. ### Claim 14 (depends on 1) The cutting tool of claim 1, wherein the plurality of fibers comprise iron alloy fibers. ### Claim 15 (depends on 1) The cutting tool of claim 1, wherein the hard particulate material of the matrix comprises tungsten carbide, wherein the binder comprises copper alloy, and wherein the plurality of fibers comprise iron fibers.