US3628921A - Corrosion resistant binder for tungsten carbide materials and titanium carbide materials - Google Patents

Corrosion resistant binder for tungsten carbide materials and titanium carbide materials Download PDF

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US3628921A
US3628921A US851038A US3628921DA US3628921A US 3628921 A US3628921 A US 3628921A US 851038 A US851038 A US 851038A US 3628921D A US3628921D A US 3628921DA US 3628921 A US3628921 A US 3628921A
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carbide
binder
compositions
carbide materials
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US851038A
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Franklin J Hill
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Bankers Trust Co
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Parker Pen Co
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Assigned to BANKERS TRUST COMPANY reassignment BANKERS TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PARKER PEN (BENELUX) N.V.
Assigned to PARKER PEN (BENELUX) N.V. reassignment PARKER PEN (BENELUX) N.V. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PARKER PEN COMPANY, THE
Assigned to PARKER PEN (BENELUX) N.V. reassignment PARKER PEN (BENELUX) N.V. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANKERS TRUST COMPANY
Assigned to BANKERS TRUST COMPANY reassignment BANKERS TRUST COMPANY RE-RECORD OF INSTRUMENT RECORDED MARCH 5, 1986 AT REEL 4547 FRAMES -0644-0648 TO CORRECT NAME OF ASSIGNOR IN A PREVIOUSLY RECORDED ASSIGNMENT. Assignors: PARKER PEN (BENELUX) B.V.
Assigned to PARKER PEN (BENELUX) B.V. reassignment PARKER PEN (BENELUX) B.V. RE-RECORD OF INSTRUMENT RECORDED MARCH 5, 1986, AT REEL 4562 FRAMES 0893-898 TO CORRECT NAME OF ASSIGNEE IN A PREVIOUSLY RECORDED ASSIGNEE. Assignors: PARKER PEN COMPANY, THE, A DE CORP.
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Assigned to PARKER PEN (BENELUX) B.V. reassignment PARKER PEN (BENELUX) B.V. RE-RECORD OF AN INSTRUMENT RECORDED JAN. 14, 1988, AT REEL 4823, FRAME 983-987 TO CORRECT THE NAME OF THE ASSIGNEE Assignors: BANKERS TRUST COMPANY, A DE. CORP.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K1/00—Nibs; Writing-points
    • B43K1/08—Nibs; Writing-points with ball points; Balls or ball beds
    • B43K1/082—Balls
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder

Definitions

  • Cemented carbide compositions containing a hard metal carbide bonded by a metal alloy binder are well known in the art.
  • the hard metal carbide is typically a tungsten or titanium carbide and the metal alloy binder is typically an iron group metal.
  • the hard metal carbide is normally present in the cemented carbide composition in at least major proportion by weight. Cemented carbide compositions can be used where hard and wear resistant compositions are required such as in cutting tools, turning tools, etc.
  • 3,215,510 to employ compositions of tungsten carbide and about 10 to about 25 percent, but not more than 30 percent, by weight of binder of chromium and nickel wherein the ratio by weight of chromium to the combined weight of nickel and chromium ranges from about 0.015 to about 0.15.
  • This composition is said to give outstanding corrosion resistance particularly to acids and alkalis.
  • An object of the present invention is the provision of novel and improved corrosion resistant cemented carbide compositions.
  • a further object of the present invention is the provision of improved shaped bodies made from said cemented carbide compositions.
  • Novel corrosion resistant cemented carbide compositions and shaped bodies produced therefrom are provided containing tungsten carbide or titanium carbide and a binder alloy containing cobalt and nickel and, by weight, about 18 to 20 percent chromium, 0.1 to 1 percent platinum and to 3 percent iron.
  • the cemented carbide compositions of the present invention are produced by powder metallurgy techniques.
  • Powder metallurgy techniques are, in general, well known in the art and include pressing a mixture of powders of the desired carbide and binder metals and then sintering the pressed mixture of powders to form a cemented composition. More particularly, a powder mixture of tungsten carbide or titanium carbide and the metals cobalt, nickel, chromium, platinum and iron is prepared and screened to obtain proper size particles.
  • the powders may be mixed, for example, in a ball mill wherein the powders are suspended in a suitable liquid such as benzene. The milled powder is then dried, mixed with a suitable binder-lubricant and pressed or compacted.
  • the pressed mixture is preferably presintered and then given a final sinter at conventional temperatures and preferably in vacuo.
  • the final sintering is generally carried out under reduced pressure. It is conventional to form cemented carbide compositions by milling together the carbide and binder alloy metals as elemental powders. It has been found, however, that cobalt and nickel coated carbide powders with chromium, platinum and iron added as elemental powders may be milled together with equally good results.
  • the finally sintered cemented carbide compositions can be shaped by conventional technique as by grinding. Small diameter spherical shapes have been found to have excellent properties for use as writing points which will rotate freely against an inking magazine in a pen. Pens of this nature are conventionally referred to as ballpoint pens. Pen" as used in this context, however, is intended to refer to any instrument which can be used to apply ink or other fluid or viscous material to a receptive surface.
  • cemented carbide compositions of the present invention possess outstanding corrosion resistance properties, particularly to aqueous ink and ferric chloride solutions. Additionally, shaped cemented carbide compositions of the present invention possess crush strengths comparable to conventional cobalt or nickel bound carbides. The above properties, therefore, make the cemented carbide compositions of the present invention particularly advantageous for use as writing points in ballpoint pens as described above.
  • the cemented carbide compositions of the present invention preferably contain about 75 to percent by weight of tungsten carbide or titanium carbide and about 5 to 25 percent or, more preferably, about 3 to 15 percent by weight of binder alloy.
  • the binder alloy compositions according to the present invention usually contain, by weight, about 30 to 60 percent cobalt, 20 to 50 percent nickel, 18 to 20 percent chromium, 0.1 to 1 percent platinum and 0 to 3 percent iron.
  • the preferred binder alloy compositions contain, by weight, about 45 to 55 percent cobalt, 25 to 35 percent nickel, 18 to 20 percent chromium, 0.5 to 1 percent platinum and 0 percent iron.
  • binder alloy compositions were prepared as shown in table 1. Table 1 lists the composition of binder alloys A through E in parts by weight of metal components.
  • a writing ball for a ballpoint pen was prepared by grinding tungsten carbide and titanium carbide compositions cemented with nickel and cobalt binders and by grinding tungsten carbide and titanium carbide compositions cemented with Alloy C binder from table 1 to compare the crush strength and microhardness properties of these compositions when formed into shaped bodies. The results of this test are set forth in table 3.
  • the powders were ball milled for 92 hours under benzene in a steel mill with steel balls.
  • the milled powder was dried, mixed with Carbowax 1,000 (a water-soluble lubricant available from Union Carbide Corp.) as a binder-lubricant and compacted in a steel die at tons/sq. in. pressure.
  • the pieces were then given a final sintering in vacuo at 2,550 F. for 1 hour under l00-200 microns pressure.
  • a flat may be ground on the side of selected presintered pieces prior to final sintering if profilometer measurements or other corrosion tests are contemplated,
  • Titanium carbide, cobalt, nickel, chromium and platinum powders were prepared and screened. The total charge of powders and corresponding particle size were as follows:
  • a cemented carbide composition comprising from about 75 percent to percent by weight of a carbide selected from the group consisting of tungsten carbide and titanium carbide and from about 5 to 25 percent by weight of a binder alloy containing cobalt and nickel and, by weight, about [8 to 20 percent chromium, 0.l to 1 percent platinum and 0 to 3 percent iron.
  • composition of claim 1 wherein the binder alloy contains, by weight, about 30 to 60 percent cobalt and 20 to 50 percent nickel.
  • composition of claim 1 wherein the binder alloy contains, by weight, about 45 to 55 percent cobalt and 25 to 35 percent nickel.
  • composition of claim 1 wherein the binder alloy contains, by weight 0 percent iron.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

Cemented carbide compositions and shaped bodies produced therefrom containing tungsten carbide or titanium carbide and a binder alloy containing cobalt and nickel and, by weight, about 18 to 20 percent chromium, 0.1 to 1 percent platinum and 0 to 3 percent iron.

Description

United States Patent Franklin .1. Hill Janesville, Wis.
Aug. 18, 1969 Dec. 21, 1971 The Parker Pen Company .lanesvllle, Wis.
Inventor Appl. No. Filed Patented Assignee CORROSION RESISTANT BINDER FOR TUNGSTEN CARBIDE MATERIALS AND TITANIUM CARBIDE MATERIALS 4 Clalms, No Drawings US Cl. 29/1821, 29/1828, 75/203, 75/204 Int. Cl C22c 29/00 Field of Search 75/ I 34,
References Cited UNITED STATES PATENTS Kieffer Dawihl et al..
Dawihl et a1 Goetzel et a1.
Smiley et a1.
Balke Wohrman Elbaum Meadows Primary Examiner-Benjamin R. Padgett Assistant Examiner-B. H. Hunt Atlorney Bacon 8 Thomas CORROSION RESISTANT BINDER FOR TUNGSTEN CARBIDE MATERIALS AND TITANIUM CARBIDE MATERIALS BACKGROUND OF THE INVENTION AND DESCRIPTION OF THE PRIOR ART Cemented carbide compositions containing a hard metal carbide bonded by a metal alloy binder are well known in the art. The hard metal carbide is typically a tungsten or titanium carbide and the metal alloy binder is typically an iron group metal. The hard metal carbide is normally present in the cemented carbide composition in at least major proportion by weight. Cemented carbide compositions can be used where hard and wear resistant compositions are required such as in cutting tools, turning tools, etc.
It has been suggested to supplement the normal iron group metal alloy binder with small amounts of chromium. The addition of small amounts of chromium or chromium carbide to a tungsten carbide-cobalt system is said to improve the corrosion resistance of the alloy but with an accompanying reduction in strength and metallurgical soundness. Additionally, the corrosion resistance of a tungsten carbide-nickel system to certain environments is said to be increased by the addition of chromium carbide but with an accompanying reduction in strength. To overcome these disadvantages, it has been suggested in US. Pat. No. 3,215,510 to employ compositions of tungsten carbide and about 10 to about 25 percent, but not more than 30 percent, by weight of binder of chromium and nickel wherein the ratio by weight of chromium to the combined weight of nickel and chromium ranges from about 0.015 to about 0.15. This composition is said to give outstanding corrosion resistance particularly to acids and alkalis.
DESCRIPTION OF THE INVENTION An object of the present invention is the provision of novel and improved corrosion resistant cemented carbide compositions.
A further object of the present invention is the provision of improved shaped bodies made from said cemented carbide compositions.
Further objects and improvements of the present invention will be apparent upon reading the undergoing specification and claims.
Novel corrosion resistant cemented carbide compositions and shaped bodies produced therefrom are provided containing tungsten carbide or titanium carbide and a binder alloy containing cobalt and nickel and, by weight, about 18 to 20 percent chromium, 0.1 to 1 percent platinum and to 3 percent iron.
The cemented carbide compositions of the present invention are produced by powder metallurgy techniques. Powder metallurgy techniques are, in general, well known in the art and include pressing a mixture of powders of the desired carbide and binder metals and then sintering the pressed mixture of powders to form a cemented composition. More particularly, a powder mixture of tungsten carbide or titanium carbide and the metals cobalt, nickel, chromium, platinum and iron is prepared and screened to obtain proper size particles. The powders may be mixed, for example, in a ball mill wherein the powders are suspended in a suitable liquid such as benzene. The milled powder is then dried, mixed with a suitable binder-lubricant and pressed or compacted. The pressed mixture is preferably presintered and then given a final sinter at conventional temperatures and preferably in vacuo. The final sintering is generally carried out under reduced pressure. It is conventional to form cemented carbide compositions by milling together the carbide and binder alloy metals as elemental powders. It has been found, however, that cobalt and nickel coated carbide powders with chromium, platinum and iron added as elemental powders may be milled together with equally good results.
The finally sintered cemented carbide compositions can be shaped by conventional technique as by grinding. Small diameter spherical shapes have been found to have excellent properties for use as writing points which will rotate freely against an inking magazine in a pen. Pens of this nature are conventionally referred to as ballpoint pens. Pen" as used in this context, however, is intended to refer to any instrument which can be used to apply ink or other fluid or viscous material to a receptive surface.
The cemented carbide compositions of the present invention possess outstanding corrosion resistance properties, particularly to aqueous ink and ferric chloride solutions. Additionally, shaped cemented carbide compositions of the present invention possess crush strengths comparable to conventional cobalt or nickel bound carbides. The above properties, therefore, make the cemented carbide compositions of the present invention particularly advantageous for use as writing points in ballpoint pens as described above.
The cemented carbide compositions of the present invention preferably contain about 75 to percent by weight of tungsten carbide or titanium carbide and about 5 to 25 percent or, more preferably, about 3 to 15 percent by weight of binder alloy. The binder alloy compositions according to the present invention usually contain, by weight, about 30 to 60 percent cobalt, 20 to 50 percent nickel, 18 to 20 percent chromium, 0.1 to 1 percent platinum and 0 to 3 percent iron. The preferred binder alloy compositions contain, by weight, about 45 to 55 percent cobalt, 25 to 35 percent nickel, 18 to 20 percent chromium, 0.5 to 1 percent platinum and 0 percent iron.
In order to compare the properties of the novel cemented carbide compositions of the present invention with the properties of prior art cemented carbide compositions, binder alloy compositions were prepared as shown in table 1. Table 1 lists the composition of binder alloys A through E in parts by weight of metal components.
TABLE-1 Binder Alloy Co Ni Cr Pt A 40 40 20 B 40 40 I9 I C 50 30 I9 I D 30 50 I9 I E 60 10 I9 I A comparison of the properties of tungsten carbide-cobalt and tungsten carbide-nickel cemented compositions with cemented compositions formed from tungsten carbide and binder alloys A through E from table 1 is shown in table 2. Corrosion data is given for aqueous ink and aqueous ferric chloride solutions.
A writing ball for a ballpoint pen was prepared by grinding tungsten carbide and titanium carbide compositions cemented with nickel and cobalt binders and by grinding tungsten carbide and titanium carbide compositions cemented with Alloy C binder from table 1 to compare the crush strength and microhardness properties of these compositions when formed into shaped bodies. The results of this test are set forth in table 3.
The following nonlimitative examples illustrate the invention:
EXAMPLE I Cobalt and nickel coated tungsten carbide powders, tungsten carbide powders and elemental chromium and platinum powders were prepared and screened to minus 325 mesh. The total charge of powders was as follows:
The powders were ball milled for 92 hours under benzene in a steel mill with steel balls. The milled powder was dried, mixed with Carbowax 1,000 (a water-soluble lubricant available from Union Carbide Corp.) as a binder-lubricant and compacted in a steel die at tons/sq. in. pressure. Cylindrical pieces of ya-inch dia. Xk inch in length where packed in a graphite-alundum mixture and presintered by heating slowly to 1,850 F. in a dissociated ammonia atmosphere. The pieces were then given a final sintering in vacuo at 2,550 F. for 1 hour under l00-200 microns pressure. A flat may be ground on the side of selected presintered pieces prior to final sintering if profilometer measurements or other corrosion tests are contemplated,
EXAMPLE 2 Titanium carbide, cobalt, nickel, chromium and platinum powders were prepared and screened. The total charge of powders and corresponding particle size were as follows:
40 g. TiC 5 microns 5 g. Co l.5 microns 3 5. Ni 7-l3 microns L9 g. Cr 325 mesh 0.l g. Pt 325 mesh 50.0 g. Total The powders were ball milled for 96 hours under benzene in a steel mill with steel balls. The milled powder was dried, mixed with a resin binder-lubricant and formed into 0.060 inch diameter spheres. The green spheres were packed in a graphite-alundum mixture and presintered by heating slowly to 1850 F. in a dissociated ammonia atmosphere. Final sintering of the spheres was carried out in vacuo at 2650" F. for one-half hour under 500 microns pressure. The spheres had shrunk to approximately 0.047 inch diameter and were then ground into 0.043 inch diameter balls for use as writing points in pens. The material of example I was also processed in like manner into balls for use as writing points in pens.
lclaim:
l. A cemented carbide composition comprising from about 75 percent to percent by weight ofa carbide selected from the group consisting of tungsten carbide and titanium carbide and from about 5 to 25 percent by weight of a binder alloy containing cobalt and nickel and, by weight, about [8 to 20 percent chromium, 0.l to 1 percent platinum and 0 to 3 percent iron.
2. The composition of claim 1 wherein the binder alloy contains, by weight, about 30 to 60 percent cobalt and 20 to 50 percent nickel.
3. The composition of claim 1 wherein the binder alloy contains, by weight, about 45 to 55 percent cobalt and 25 to 35 percent nickel.
4. The composition of claim 1 wherein the binder alloy contains, by weight 0 percent iron.
UNITED STATES PATENT ()FFICE CERTIFICATE OF CORREfiTiQN Patent No, 3, Dated December Inventor Franklin J.
It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 2, line 68 "Attacked, WC 10% Ni Attacked, 20" should be WC+ 10% Ni:
' 0. '75 1. 50 Attacked, 220
Column 3, line 45 "where" should be were Signed and sealed this 28th day of November- 1972.
(SEAL) Attest:
EDWARD M.FLETCI+IER,J'R. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents FORM PO-1050(10-69) USCOMM-DC 5O376-P59 U.S GOVERNMENT PRINTING OFFICE I959 0"366'334 UNETED STATES PATENT GFFICE CERTIFICATE OF QOREGH Patent N 3, Dated December Inventor Franklin J.
It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 2, line 68 v "Attacked, WC +10% Ni Attacked, 20" should be WC+ 10% Ni:
0. 75 1.50 Attacked,?20
Column 3, line 45 "where" should be were Signed and sealed this 28th day of November 1972.
(SEAL) Attest:
EDWARD M.FLETCHER,J'R. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents FORM FO-IOSO (10-69) USCOMM-DC GOING-P69 w u.S. GOVERNMENT PRINTING OFFICE I969 0-455-334

Claims (3)

  1. 2. The composition of claim 1 wherein the binder alloy contains, by weight, about 30 to 60 percent cobalt and 20 to 50 percent nickel.
  2. 3. The composition of claim 1 wherein the binder alloy contains, by weight, about 45 to 55 percent cobalt and 25 to 35 percent nickel.
  3. 4. The composition of claim 1 wherein the binder alloy contains, by weight 0 percent iron.
US851038A 1969-08-18 1969-08-18 Corrosion resistant binder for tungsten carbide materials and titanium carbide materials Expired - Lifetime US3628921A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746456A (en) * 1969-08-18 1973-07-17 Parker Pen Co Ball point pen writing ball composed of a cemented carbide composition
US3900936A (en) * 1972-10-31 1975-08-26 Parker Pen Co Cemented ferrochrome material
US3993446A (en) * 1973-11-09 1976-11-23 Dijet Industrial Co., Ltd. Cemented carbide material
US4182627A (en) * 1977-09-26 1980-01-08 National Research Development Corporation Balls containing tungsten carbide
US4432794A (en) * 1980-07-19 1984-02-21 Kernforschungszentrum Karlsruhe Gmbh Hard alloy comprising one or more hard phases and a binary or multicomponent binder metal alloy
EP0214679A1 (en) * 1985-08-08 1987-03-18 Metallwerk Plansee Gesellschaft M.B.H. Oxidation-resistant hard metal alloy
US4704336A (en) * 1984-03-12 1987-11-03 General Electric Company Solid particle erosion resistant coating utilizing titanium carbide
EP0252722A2 (en) * 1986-07-08 1988-01-13 Oki Electric Industry Company, Limited Wire-dot print head and wire therefor
US5358545A (en) * 1990-09-18 1994-10-25 Carmet Company Corrosion resistant composition for wear products
US6332728B1 (en) * 1998-12-03 2001-12-25 Sakura Color Products Corporation Ball for ball-point pen
WO2002063054A2 (en) * 2001-02-02 2002-08-15 Boart Longyear Gmbh & Co. Kg Soil processing tool comprising a working element made of hard metal
US6835449B2 (en) * 2001-09-12 2004-12-28 Mogas Industries, Inc. Nanostructured titania coated titanium
US20050025657A1 (en) * 2003-07-25 2005-02-03 Sandvik Ab Method of making a fine grained cemented carbide
US20060289088A1 (en) * 2005-06-28 2006-12-28 General Electric Company Titanium treatment to minimize fretting
US20090007542A1 (en) * 2005-06-28 2009-01-08 General Electric Company Titanium treatment to minimize fretting
US20120060372A1 (en) * 1997-09-08 2012-03-15 Trent West Methods of Making Tungsten Carbide-Based Annular Jewelry Rings
US8440314B2 (en) 2009-08-25 2013-05-14 TDY Industries, LLC Coated cutting tools having a platinum group metal concentration gradient and related processes
US8512882B2 (en) 2007-02-19 2013-08-20 TDY Industries, LLC Carbide cutting insert
US11585455B2 (en) 2013-11-26 2023-02-21 Spm Oil & Gas Inc. Valve seats for use in fracturing pumps

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Publication number Priority date Publication date Assignee Title
US2067166A (en) * 1933-03-06 1937-01-12 Ramet Corp Tantalum carbide alloy
US2097140A (en) * 1935-06-27 1937-10-26 Wilson H A Co Composition of metal
US2134305A (en) * 1936-03-27 1938-10-25 American Cutting Alloys Inc Method of manufacturing hard metal alloys
US2162574A (en) * 1937-05-15 1939-06-13 Gen Electric Hard metal alloy
US2253969A (en) * 1939-07-31 1941-08-26 Gen Electric Hard metal alloy for structures operating under pressure and/or sliding motion
US2581252A (en) * 1947-12-31 1952-01-01 Sintercast Corp America Powder metallurgy articles
US2986807A (en) * 1958-09-03 1961-06-06 Union Carbide Corp Metal bonded refractory
US3149411A (en) * 1962-12-21 1964-09-22 Jersey Prod Res Co Composite materials containing cemented carbides
US3515540A (en) * 1964-12-16 1970-06-02 Du Pont Mixed cobalt/tungsten carbide powders

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2067166A (en) * 1933-03-06 1937-01-12 Ramet Corp Tantalum carbide alloy
US2097140A (en) * 1935-06-27 1937-10-26 Wilson H A Co Composition of metal
US2134305A (en) * 1936-03-27 1938-10-25 American Cutting Alloys Inc Method of manufacturing hard metal alloys
US2162574A (en) * 1937-05-15 1939-06-13 Gen Electric Hard metal alloy
US2253969A (en) * 1939-07-31 1941-08-26 Gen Electric Hard metal alloy for structures operating under pressure and/or sliding motion
US2581252A (en) * 1947-12-31 1952-01-01 Sintercast Corp America Powder metallurgy articles
US2986807A (en) * 1958-09-03 1961-06-06 Union Carbide Corp Metal bonded refractory
US3149411A (en) * 1962-12-21 1964-09-22 Jersey Prod Res Co Composite materials containing cemented carbides
US3515540A (en) * 1964-12-16 1970-06-02 Du Pont Mixed cobalt/tungsten carbide powders

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3746456A (en) * 1969-08-18 1973-07-17 Parker Pen Co Ball point pen writing ball composed of a cemented carbide composition
US3900936A (en) * 1972-10-31 1975-08-26 Parker Pen Co Cemented ferrochrome material
US3993446A (en) * 1973-11-09 1976-11-23 Dijet Industrial Co., Ltd. Cemented carbide material
US4182627A (en) * 1977-09-26 1980-01-08 National Research Development Corporation Balls containing tungsten carbide
US4432794A (en) * 1980-07-19 1984-02-21 Kernforschungszentrum Karlsruhe Gmbh Hard alloy comprising one or more hard phases and a binary or multicomponent binder metal alloy
US4704336A (en) * 1984-03-12 1987-11-03 General Electric Company Solid particle erosion resistant coating utilizing titanium carbide
AT385775B (en) * 1985-08-08 1988-05-10 Plansee Metallwerk CORROSION-RESISTANT CARBIDE ALLOY
EP0214679A1 (en) * 1985-08-08 1987-03-18 Metallwerk Plansee Gesellschaft M.B.H. Oxidation-resistant hard metal alloy
EP0252722A2 (en) * 1986-07-08 1988-01-13 Oki Electric Industry Company, Limited Wire-dot print head and wire therefor
EP0252722A3 (en) * 1986-07-08 1989-03-22 Oki Electric Industry Company, Limited Wire-dot print head and wire therefor
US5358545A (en) * 1990-09-18 1994-10-25 Carmet Company Corrosion resistant composition for wear products
US20120060372A1 (en) * 1997-09-08 2012-03-15 Trent West Methods of Making Tungsten Carbide-Based Annular Jewelry Rings
US8584360B2 (en) * 1997-09-08 2013-11-19 Trent West Methods of making tungsten carbide-based annular jewelry rings
US6332728B1 (en) * 1998-12-03 2001-12-25 Sakura Color Products Corporation Ball for ball-point pen
WO2002063054A2 (en) * 2001-02-02 2002-08-15 Boart Longyear Gmbh & Co. Kg Soil processing tool comprising a working element made of hard metal
WO2002063054A3 (en) * 2001-02-02 2002-10-24 Boart Longyear Gmbh & Co Kg Soil processing tool comprising a working element made of hard metal
US6835449B2 (en) * 2001-09-12 2004-12-28 Mogas Industries, Inc. Nanostructured titania coated titanium
US20050025657A1 (en) * 2003-07-25 2005-02-03 Sandvik Ab Method of making a fine grained cemented carbide
US20060029511A1 (en) * 2003-07-25 2006-02-09 Sandvik Ab Method of making a fine grained cemented carbide
US20060289088A1 (en) * 2005-06-28 2006-12-28 General Electric Company Titanium treatment to minimize fretting
US20090007542A1 (en) * 2005-06-28 2009-01-08 General Electric Company Titanium treatment to minimize fretting
US7506440B2 (en) 2005-06-28 2009-03-24 General Electric Company Titanium treatment to minimize fretting
US20090104041A1 (en) * 2005-06-28 2009-04-23 General Electric Company Titanium treatment to minimize fretting
US8512882B2 (en) 2007-02-19 2013-08-20 TDY Industries, LLC Carbide cutting insert
US8440314B2 (en) 2009-08-25 2013-05-14 TDY Industries, LLC Coated cutting tools having a platinum group metal concentration gradient and related processes
US11585455B2 (en) 2013-11-26 2023-02-21 Spm Oil & Gas Inc. Valve seats for use in fracturing pumps

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