SE531330C2 - Ways to make a cemented carbide powder with low shrinkage shrinkage - Google Patents

Ways to make a cemented carbide powder with low shrinkage shrinkage

Info

Publication number
SE531330C2
SE531330C2 SE0702172A SE0702172A SE531330C2 SE 531330 C2 SE531330 C2 SE 531330C2 SE 0702172 A SE0702172 A SE 0702172A SE 0702172 A SE0702172 A SE 0702172A SE 531330 C2 SE531330 C2 SE 531330C2
Authority
SE
Sweden
Prior art keywords
weight
bodies
shrinkage
grinding
powder
Prior art date
Application number
SE0702172A
Other languages
Swedish (sv)
Other versions
SE0702172L (en
Inventor
Jan Qvick
Original Assignee
Seco Tools Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seco Tools Ab filed Critical Seco Tools Ab
Priority to SE0702172A priority Critical patent/SE531330C2/en
Priority to US12/680,264 priority patent/US20100260641A1/en
Priority to PCT/SE2008/051069 priority patent/WO2009041901A1/en
Priority to EP08833090A priority patent/EP2205382A1/en
Publication of SE0702172L publication Critical patent/SE0702172L/en
Publication of SE531330C2 publication Critical patent/SE531330C2/en

Links

Classifications

    • B22F1/0059—
    • B22F1/0081—
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • 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
    • C22C29/08—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 based on tungsten carbide
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
    • 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

Landscapes

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

Description

20 25 30 35 5131 330 2 Våtmalningen utförs i en roterande kulkvam med ett relationstal mellan vikten av malkroppar och pulver av 2-5. Malkropparna är utformade antingen som sfärer eller cylindrar med halvsfäriska ändytor. De sfariska kropparna har en diameter av 10 till 15 mm, företrädesvis 11 till 14 mm. De cy- lindriska kropparna har en diameter och höjd av 10 till 15 mm, företrädesvis l l till 14 mm. Samman- sättningen av kropparna är WC med 6 till 10 vikt-% Co, företrädesvis 7 till 9 vikt-% Co. För att nå den önskade kornstorleken av det malda pulvret kan det vara nödvändigt att förlänga maltidenjämfört med malning enligt känd teknik. ' Exempel 1 Ett hårdmetallpulver med sammansättningen WC - 9 vikt-% Co, 0.5 vikt-% (Ta, Nb)C (90/10) och 2.0 vikt-% PEG 3400 bereddes enligt uppfinningen. FSSS-värdet för WC var 5.4 um. Den totala satsvikten var 450 kg och vikten av malkroppama var 1340 kg. Malningen utfördes i 93.2 liter vätska bestående av en blandning av etanol och 20 vikt-% vatten. Malkropparna var cylindriska med diameter och höjd 12 mm och en sammansättning av WC med 8.5 vikt-% Co. Maltiden var 32 timmar. Pulver- satsen spraytorkades och pressades till kroppar med ungefärlig storlek l5x15x7 mm vid normaltrycket 123 MPa. Kroppama sintrades vid l430°C enligt standardsintringsbetingelser. De noggranna dimensio- nema av kroppama bestämdes före och efier sintring. The wet grinding is performed in a rotating ball mill with a ratio between the weight of grinding bodies and powder of 2-5. The grinding bodies are designed either as spheres or cylinders with hemispherical end surfaces. The spherical bodies have a diameter of 10 to 15 mm, preferably 11 to 14 mm. The cylindrical bodies have a diameter and height of 10 to 15 mm, preferably 11 to 14 mm. The composition of the bodies is WC with 6 to 10% by weight of Co, preferably 7 to 9% by weight of Co. In order to reach the desired grain size of the ground powder, it may be necessary to extend the grinding time compared to grinding according to known techniques. Example 1 A cemented carbide powder having the composition WC - 9% by weight Co, 0.5% by weight (Ta, Nb) C (90/10) and 2.0% by weight PEG 3400 was prepared according to the invention. The FSSS value for WC was 5.4 μm. The total batch weight was 450 kg and the weight of the grinding bodies was 1340 kg. The grinding was carried out in 93.2 liters of liquid consisting of a mixture of ethanol and 20% by weight of water. The grinding bodies were cylindrical with a diameter and height of 12 mm and a composition of WC with 8.5% by weight of Co. The meal time was 32 hours. The powder batch was spray dried and pressed into bodies of approximate size l5x15x7 mm at the normal pressure of 123 MPa. The bodies were sintered at 1430 ° C according to standard sintering conditions. The exact dimensions of the bodies were determined before and after sintering.

Den linjära krympningen av kroppama var 17.0 % och koerciviteten var 9.3 kA/m. Metallogra- fisk undersökning visade en porositet av AOOBOOCOO.The linear shrinkage of the bodies was 17.0% and the coercivity was 9.3 kA / m. Metallographic examination showed a porosity of AOOBOOCOO.

Exempel 2 Exempel 1 upprepades med undantag för maltiden, som var 16 timmar.Example 2 Example 1 was repeated except for the meal time, which was 16 hours.

Den linjära krympningen av kroppama var 16.9 % och koerciviteten var 8.4 kA/m. Metallogra- fisk undersökning visade en porositet av AOOBOOCOO.The linear shrinkage of the bodies was 16.9% and the coercivity was 8.4 kA / m. Metallographic survey showed a porosity of AOOBOOCOO.

Exempel 3 ~ Känd teknik Exempel l upprepades med undantag av att storleken på malkroppama var 8 mm.Example 3 ~ Prior Art Example 1 was repeated except that the size of the grinding bodies was 8 mm.

Den linjära krympningen av kroppama var 18.1 % och koerciviteten var 9.9 kA/m. Metallogra- fisk undersökning visade en porositet av AOOBOOCOO.The linear shrinkage of the bodies was 18.1% and the coercivity was 9.9 kA / m. Metallographic survey showed a porosity of AOOBOOCOO.

Exempel 4 - Känd teknik Exempel 2 upprepades med undantag av att storleken på malkroppama var 8 mm.Example 4 - Prior art Example 2 was repeated except that the size of the grinding bodies was 8 mm.

Den lineära krympningen av kroppama var 17.8 % och koerciviteten var 9.1 kA/m. Metallogra- fisk undersökning visade en porositet av AOOBOOCOO.The linear shrinkage of the bodies was 17.8% and the coercivity was 9.1 kA / m. Metallographic examination showed a porosity of AOOBOOCOO.

Sålunda visar Exempel 1-4 att malning med stora malkroppar medför ett pulver med en låg sínt- ringskrympning vilket innebär att presstrycket blir lågt vid en given krympning. Dessutom, visar ex- emplen att en längre maltid behövs för att erhålla samma koercivitet för den sintrade kroppen. Men pressning vid ett lågt tryck att föredra framför en kort maltid.Thus, Examples 1-4 show that grinding with large grinding bodies results in a powder with a low sintering shrinkage, which means that the pressing pressure becomes low at a given shrinkage. In addition, the examples show that a longer meal is needed to obtain the same coercivity for the sintered body. But pressing at a low pressure is preferable to a short meal.

Claims (2)

10 531 330 Krav10 531 330 Requirements 1. Hårdmetallpulver med låg sintringskrympning för skär fór metallbearbetning omfattande WC och 4 - 15 vikt-% Co och upp till 20 vikt-% av kubisk-karbidbildande element från gruppema 4b och Sb i det periodiska systemet med WC-kom med en medelkomstorlek inom området 3 ~ 9 um k ä n n e t e c k n at av att pulvret har en sintringskrympning av 16.5 till 17.5 %, helst inom 16.7 till 17.3 % vid ett presstryck av 123 MPa.Carbide powder with low sintering shrinkage for inserts for metalworking comprising WC and 4 - 15% by weight Co and up to 20% by weight of cubic carbide-forming elements from groups 4b and Sb in the periodic table WC-grain system with an average size 3 ~ 9 μm is characterized in that the powder has a sintering shrinkage of 16.5 to 17.5%, preferably within 16.7 to 17.3% at a compression pressure of 123 MPa. 2. Ett sätt att tillverka hårdmetallpulver med låg sintringskrympning för skär för metallbearbet- ning omfattande WC och 4 - 15 vikt-% Co och upp till 20 vikt-% av kubisk-karbidbildande element från gruppema 4b och 5b i det periodiska systemet med hjälp av pulvermetallurgisk teknik våtmalning, pressning och sintring k ä n n e t e c k n a t av våtmalning i en roterande kulkvam med ett relationstal mellan vikten av malkroppar och pulver av 2-5, varvid malkropparna är utformade antingen som sfärer eller cylindrar med halvsfäriska ändytor varvid de sfäriska kroppama har en diameter av 10 till 15 mm och de cylindriska kropparna har en diameter och höjd av 10 till 15 mm och med en sammansättning av malkroppama av WC med 6 till 10 vikt-% Co.A method of making cemented carbide powder with low sintering shrinkage for metalworking inserts comprising WC and 4 - 15% by weight Co and up to 20% by weight of cubic carbide-forming elements from groups 4b and 5b of the Periodic Table using powder metallurgical technique wet grinding, pressing and sintering characterized by wet grinding in a rotating ball mill with a ratio between the weight of grinding bodies and powders of 2-5, the grinding bodies being designed either as spheres or cylinders with hemispherical end surfaces, the spherical bodies having a diameter of 10 to 15 mm and the cylindrical bodies have a diameter and height of 10 to 15 mm and with a composition of the grinding bodies of WC with 6 to 10% by weight Co.
SE0702172A 2007-09-28 2007-09-28 Ways to make a cemented carbide powder with low shrinkage shrinkage SE531330C2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE0702172A SE531330C2 (en) 2007-09-28 2007-09-28 Ways to make a cemented carbide powder with low shrinkage shrinkage
US12/680,264 US20100260641A1 (en) 2007-09-28 2008-09-24 Method of making a cemented carbide powder with low sintering shrinkage and the powder obtained
PCT/SE2008/051069 WO2009041901A1 (en) 2007-09-28 2008-09-24 Method of making a cemented carbide powder with low sintering shrinkage and the powder obtained
EP08833090A EP2205382A1 (en) 2007-09-28 2008-09-24 Method of making a cemented carbide powder with low sintering shrinkage and the powder obtained

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0702172A SE531330C2 (en) 2007-09-28 2007-09-28 Ways to make a cemented carbide powder with low shrinkage shrinkage

Publications (2)

Publication Number Publication Date
SE0702172L SE0702172L (en) 2009-02-24
SE531330C2 true SE531330C2 (en) 2009-02-24

Family

ID=40383482

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0702172A SE531330C2 (en) 2007-09-28 2007-09-28 Ways to make a cemented carbide powder with low shrinkage shrinkage

Country Status (4)

Country Link
US (1) US20100260641A1 (en)
EP (1) EP2205382A1 (en)
SE (1) SE531330C2 (en)
WO (1) WO2009041901A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2246113A1 (en) * 2009-04-29 2010-11-03 Sandvik Intellectual Property AB Process for milling cermet or cemented carbide powder mixtures
CN102389969B (en) * 2011-12-05 2013-10-09 北京工商大学 Powder metallurgical material for cold stamping mold and mold forming method using same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6516429A (en) * 1964-12-16 1966-06-17
US3531280A (en) * 1969-06-23 1970-09-29 Du Pont Heterogeneity by mixing diverse powders prior to consolidation
US4070184A (en) * 1976-09-24 1978-01-24 Gte Sylvania Incorporated Process for producing refractory carbide grade powder
US5045277A (en) * 1990-09-10 1991-09-03 Gte Products Corporation Method of producing metal carbide grade powders and controlling the shrinkage of articles made therefrom
SE509616C2 (en) * 1996-07-19 1999-02-15 Sandvik Ab Cemented carbide inserts with narrow grain size distribution of WC
SE518810C2 (en) * 1996-07-19 2002-11-26 Sandvik Ab Cemented carbide body with improved high temperature and thermomechanical properties
US6245288B1 (en) * 1999-03-26 2001-06-12 Omg Americas, Inc. Method of preparing pressable powders of a transition metal carbide, iron group metal of mixtures thereof
SE519603C2 (en) * 1999-05-04 2003-03-18 Sandvik Ab Ways to make cemented carbide of powder WC and Co alloy with grain growth inhibitors

Also Published As

Publication number Publication date
US20100260641A1 (en) 2010-10-14
SE0702172L (en) 2009-02-24
EP2205382A1 (en) 2010-07-14
WO2009041901A1 (en) 2009-04-02

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