US20090308102A1 - Tungsten ring composition - Google Patents

Tungsten ring composition Download PDF

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Publication number
US20090308102A1
US20090308102A1 US12/141,791 US14179108A US2009308102A1 US 20090308102 A1 US20090308102 A1 US 20090308102A1 US 14179108 A US14179108 A US 14179108A US 2009308102 A1 US2009308102 A1 US 2009308102A1
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US
United States
Prior art keywords
powder mixture
article
weight
carbide
jewelry
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/141,791
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English (en)
Inventor
Glenn Miller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stuller Inc
Original Assignee
Glenn Miller
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Filing date
Publication date
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Application filed by Glenn Miller filed Critical Glenn Miller
Priority to CA002668794A priority Critical patent/CA2668794A1/en
Publication of US20090308102A1 publication Critical patent/US20090308102A1/en
Assigned to STULLER, INC. reassignment STULLER, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MILLER, GLENN A.
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the present invention generally relates to the field of jewelry articles and specifically jewelry articles comprising tungsten.
  • a method of forming a jewelry article comprises (a) providing a powder mixture comprising tungsten and one or more of: titanium carbide, chromium carbide, nickel, molybdenum, vanadium carbide and iron, (b) placing the powder mixture in a mold and (c) applying sufficient pressure and temperature to the powder mixture to form a solid jewelry article.
  • a jewelry article comprises less than 50% by weight tungsten and balance titanium carbide, chromium carbide, nickel, molybdenum, vanadium carbide and iron.
  • FIG. 1 is a flow diagram illustrating the steps in the manufacture of a jewelry article, in accordance with one embodiment.
  • FIG. 2-3 are images of jewelry article manufacture equipments, a powder mixture and raw jewelry articles.
  • a method of forming a jewelry article comprises (a) providing a powder mixture comprising tungsten and one or more metallic and/or ceramic component(s), (b) placing the powder mixture in a mold and (c) applying sufficient pressure and temperature to the powder mixture to form a solid jewelry article.
  • the jewelry article formed according to the present embodiments comprises tungsten and one or more metallic and/or ceramic components.
  • the powder mixture comprises tungsten and one or more of: titanium carbide (TiC), chromium carbide (Cr 3 C 2 ), nickel, molybdenum, vanadium carbide (VC) and iron.
  • the powder mixture comprises tungsten, titanium carbide, chromium carbide, nickel, molybdenum, vanadium carbide and iron.
  • the weight percentage range of each component in the mixture may vary depending on the desired physical properties and/or aesthetic appearance of the jewelry article.
  • the weight percent of tungsten in the mixture is less than about 50%.
  • the tungsten weight percent is about 20-50%, and most preferably about 40-50%.
  • the powder mixture may comprise about 15-25%, preferably about 21-22% titanium carbide.
  • the chromium carbide content may be about 15-25%, preferably about 19-21%.
  • the nickel content may be about 15-25%, preferably about 22-23%.
  • molybdenum and vanadium carbide combined amount may be about 5-10%, preferably between 7-8%.
  • the iron content may be about 1-5%, preferably about 2-3%. All percent ranges described herein are by weight and include every individual value within each range.
  • the mixture comprises about 21-22% titanium carbide, about 20% chromium carbide, about 45% tungsten, about 22-23% nickel, about 7-8% molybdenum and vanadium carbide combined, and about 2-3% iron.
  • the powder mixture is prepared by milling a particle mixture of the components for a sufficient period of time to reduce the size of the mixture particles.
  • the powder mixture is prepared by combining components that are already in powder form (fine particles).
  • the mixture in addition to milling, is also subject to one or more steps of sedimentation/separation, drying and sifting.
  • a mixture comprising tungsten and one or more of titanium carbide, chromium carbide, nickel, molybdenum, vanadium carbide and iron is milled, followed by sedimentation/separation, drying and sifting steps to form a powder mixture.
  • a mixture of tungsten and one or more of titanium carbide, chromium carbide, nickel, molybdenum, vanadium carbide and iron is subjected to (a) milling (b) sedimentation/separation, (c) drying, (d) sifting and again (e) drying to form a powder mixture.
  • the powder mixture also comprises at least one rubber material.
  • the rubber assists in binding the powder particles together.
  • the rubber assist in processing and shaping the powder mixture.
  • the amount of rubber added may vary depending on the processing and shaping requirements. Examples of suitable rubbers include, but are not limited to, latex rubbers, butadiene rubbers, styrene butadiene rubbers, thermoplastic elastomers and melt processible rubbers. Of course, a combination of different types of rubbers may also be used.
  • the rubber material comprises styrene-butadiene-styrne (SBS). However, other similar polymeric materials such as styrene-isoprene-styrene may be equally useful.
  • the mixture processing step includes milling
  • the rubber material is preferably added after the milling step.
  • the weight percent of tungsten and other components in the powder mixture may differ from that in the raw jewelry article. For instance, addition of other components, such as SBS rubber, may lower the weight percent of the powder mixture components. Still, in some embodiments, the weight percent of the components in the powder mixture and jewelry article maybe about the same.
  • the particle size range is preferably small enough to allow effective sintering of said powder mixture. If needed, particle size may be reduced by running a particle mixture through a sieve, to obtain smaller particle sizes. For instance in a non-limiting example, a mixture is run through one or more sieves with mish hole diameter(s) less than 0.40 mm to obtain a powder mixture with an average particle size of about 1-2 ⁇ m.
  • the density and hardness of the formed article may vary depending on the type and amount of the components.
  • the formed jewelry article has a density between about 8-9 g/cm 3 and a HRC hardness of about 74.0 or higher.
  • the powder mixture also comprises components which impart color to the jewelry article. For instance an amount of a nitride may be added to change the color of the article.
  • the powder mixture is placed in the cavity of a mold and subjected to elevated pressures to form the raw jewelry article.
  • the mold cavity may be shaped according to any basic jewelry article design. In the preferred embodiments, the mold cavity produces an annular shaped jewelry article.
  • the formed raw jewelry article may comprise one or more facets, grooves, or notches.
  • the powder mixture is sintered (or melted) in the mold at a temperature of about 1440-1450° C.
  • the powder mixture is first heated to about 550° C. before sintering to remove the rubber contents (wax).
  • the raw jewelry article may be then subject to further processing steps, such as attaching precious metals pieces or gems to the article.
  • step 100 a mixture comprising 21.35% TiC, 20% chromium carbide, 45.87% W, 22.68% Ni, 7.54% Mo+VC and 2.18% Fe, is milled in ethanol for 72 hours.
  • step 102 the milled mixture undergoes sedimentation/separation followed by a drying step 104 at 90-100° C., 1 atm for 2.5 hours.
  • step 106 an amount of SBS rubber is then added to the powder mixture in step 108 .
  • This mixture is again sifted resulting in a powder mixture having particles sizes in the range of about 1-2 ⁇ m.
  • the first and second sifting steps are carried out using a mesh with 0.19 mm and 0.38 mm diameter holes, respectively.
  • the powder mixture is then dried in step 112 for about 1-1.5 hours and shaped in consecutive molding 114 and melting (sintering) 116 steps.
  • the melting step is carried out in a vacuum furnace by first heating the raw article (to remove the rubber) at 550° C. for 4-5 hours, then heating at 1440-1450° C. for 8-10 hours, followed by cooling for 10-12 hours.
  • the raw jewelry article is then obtained in step 118 for additional processing, as required.
  • FIGS. 2A-B depict manufacturing equipments connected with the steps shown in FIG. 1 .
  • FIG. 2A shows a milling machine 202 , sedimentation/separation equipment 204 , drying equipment 206 and 212 and adding/sifting apparatus 208 and 210 .
  • FIG. 2B shows a molding unit 216 , a vacuum furnace 218 , a powder mixture 214 as well as raw jewelry articles 220 .
  • the density of the jewelry article formed is about 8.81 g/cm 3 with an HRC hardness of about 74.0.
  • the manufacturing process described shows a 100 kg/day production capacity for powder mixture production. Also, the molding process has the capacity to handle 2500 pieces/mold in one day. Finally, the production of the raw jewelry article is about 5000 pcs/day.

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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)
  • Adornments (AREA)
US12/141,791 2008-06-13 2008-06-18 Tungsten ring composition Abandoned US20090308102A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002668794A CA2668794A1 (en) 2008-06-13 2009-06-12 Tungsten ring composition

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2008101737471A CN101602106A (zh) 2008-06-13 2008-06-13 含钨戒指制品
CN200810173747.1 2008-06-13

Publications (1)

Publication Number Publication Date
US20090308102A1 true US20090308102A1 (en) 2009-12-17

Family

ID=41413508

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/141,791 Abandoned US20090308102A1 (en) 2008-06-13 2008-06-18 Tungsten ring composition

Country Status (3)

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US (1) US20090308102A1 (zh)
CN (1) CN101602106A (zh)
CA (1) CA2668794A1 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050154491A1 (en) * 2002-01-25 2005-07-14 Anderson Gregor J.M. Medicament dispenser
US8927107B2 (en) 2011-06-03 2015-01-06 Frederick Goldman, Inc. Multi-coated metallic products and methods of making the same
US8956510B2 (en) 2011-06-03 2015-02-17 Frederick Goldman, Inc. Coated metallic products and methods for making the same
WO2016186232A1 (ko) * 2015-05-21 2016-11-24 최정남 주얼리용 서멧합금 및 이의 제조방법
US9949539B2 (en) 2010-06-03 2018-04-24 Frederick Goldman, Inc. Method of making multi-coated metallic article

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102825250A (zh) * 2011-06-15 2012-12-19 张乃文 一种碳化钨首饰加工工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101318A (en) * 1976-12-10 1978-07-18 Erwin Rudy Cemented carbide-steel composites for earthmoving and mining applications
US4374900A (en) * 1978-07-04 1983-02-22 Sumitomo Electric Industry, Ltd. Composite diamond compact for a wire drawing die and a process for the production of the same
US4636252A (en) * 1983-05-20 1987-01-13 Mitsubishi Kinzoku Kabushiki Kaisha Method of manufacturing a high toughness cermet for use in cutting tools
US7076972B2 (en) * 1997-09-08 2006-07-18 Trent West Tungsten carbide-based annular jewelry article

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006116425A2 (en) * 2005-04-25 2006-11-02 Smarsh Steven G Ceramic finger ring jewelry and method of making same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101318A (en) * 1976-12-10 1978-07-18 Erwin Rudy Cemented carbide-steel composites for earthmoving and mining applications
US4374900A (en) * 1978-07-04 1983-02-22 Sumitomo Electric Industry, Ltd. Composite diamond compact for a wire drawing die and a process for the production of the same
US4636252A (en) * 1983-05-20 1987-01-13 Mitsubishi Kinzoku Kabushiki Kaisha Method of manufacturing a high toughness cermet for use in cutting tools
US7076972B2 (en) * 1997-09-08 2006-07-18 Trent West Tungsten carbide-based annular jewelry article

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9636471B2 (en) 2002-01-25 2017-05-02 Glaxo Group Limited Medicament dispenser
US8511304B2 (en) * 2002-01-25 2013-08-20 Glaxo Group Limited Medicament dispenser
US20050154491A1 (en) * 2002-01-25 2005-07-14 Anderson Gregor J.M. Medicament dispenser
US11503886B2 (en) 2010-06-03 2022-11-22 Frederick Goldman, Inc. Multi-coated metallic articles
US9949539B2 (en) 2010-06-03 2018-04-24 Frederick Goldman, Inc. Method of making multi-coated metallic article
US9949538B2 (en) 2011-06-03 2018-04-24 Frederick Goldman, Inc. Multi-coated metallic products and methods of making the same
US9629425B2 (en) 2011-06-03 2017-04-25 Frederick Goldman, Inc. Coated metallic products and methods for making the same
US9034488B2 (en) 2011-06-03 2015-05-19 Frederick Goldman, Inc. Coated metallic products and methods for making the same
US8956510B2 (en) 2011-06-03 2015-02-17 Frederick Goldman, Inc. Coated metallic products and methods for making the same
US8932437B2 (en) 2011-06-03 2015-01-13 Frederick Goldman, Inc. Multi-coated metallic products and methods of making the same
US11234500B2 (en) 2011-06-03 2022-02-01 Frederick Goldman, Inc. Multi-coated metallic products and methods of making the same
US8927107B2 (en) 2011-06-03 2015-01-06 Frederick Goldman, Inc. Multi-coated metallic products and methods of making the same
WO2016186232A1 (ko) * 2015-05-21 2016-11-24 최정남 주얼리용 서멧합금 및 이의 제조방법

Also Published As

Publication number Publication date
CN101602106A (zh) 2009-12-16
CA2668794A1 (en) 2009-12-13

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AS Assignment

Owner name: STULLER, INC., LOUISIANA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MILLER, GLENN A.;REEL/FRAME:024892/0387

Effective date: 20100504

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION