WO2005023729A1 - Tungsten carbide cutting tool material - Google Patents
Tungsten carbide cutting tool material Download PDFInfo
- Publication number
- WO2005023729A1 WO2005023729A1 PCT/EP2003/009936 EP0309936W WO2005023729A1 WO 2005023729 A1 WO2005023729 A1 WO 2005023729A1 EP 0309936 W EP0309936 W EP 0309936W WO 2005023729 A1 WO2005023729 A1 WO 2005023729A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting tool
- tool material
- tungsten carbide
- sintering
- cutting
- Prior art date
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Definitions
- This invention relates to the field of manufacturing and application of polycrystalline tungsten carbide materials suitable for cutting and wear applications.
- Cemented tungsten carbide has become an import material for cutting applications.
- the cobalt binder phase typically used enables sinterability below 1550 °C and provides good toughness. However, it degrades strength, hardness, chemical stability and temperature resistance compared to pure tungsten carbide.
- diamond or cubic boron nitride have become viable alternatives. Consequently, various attempts have been made to improve relevant properties by reducing the binder content in polycrystalline WC. Ideally, the binder is completely omitted while
- a further approach is to allow for cobalt on an impurity level by milling binderless tungsten 40 carbide with cemented tungsten carbide balls.
- the latter produce a well distributed contamination of cobalt in the powder. While the cobalt contamination improves the sinterability of the WC powder, grain growth also can become a problem thus reducing the materials fracture toughness. This happens in particular when fine grained or nanosized powders are sintered. Consequently, strength and hardness are below the desirable optimum.
- all procedures described to make a "binderless" tungsten carbide contain Co at least on a contamination level which is more than 0.1 % by weight.
- HEP 50 - pressing
- the disclosed material is an essentially binder free (Co ⁇ 0.1%, preferably Co ⁇ 0.01% by " weight), very pure tungsten carbide (> 99.9% non-oxide purity) with high relative densities (>98.0%) and very fine grain sizes.
- the disclosed tungsten carbide has essentially the following features:
- a powder processing step when admixing toughening agents comprising of extended ball milling with binder-free WC balls in an organic solvent and a drying step to obtain a granulated powder suitable for dry pressing, or a pressure filtration step utilizing the as- 100 milled (and screened) slurry to produce a solid green compact.
- the sintered compact a) has a porosity of equal to or less than 2 %, preferably less than 1%.
- 105 " b) has a mean particle size of equal to or less than 1 ⁇ m, but preferably of 0.05 to 0.3 ⁇ m. has a Nickers hardness of HVio equal to or better than 23 GPa
- the finer grain structure in line with higher toughness, hardness and strength, reduces in particular abrasive wear at the contact point between work piece and cutting tool during cutting, but also crater wear caused during machining titanium alloys or other materials which 130 ⁇ generate a hot erosive chip during cutting, especially in case of high speed machining.
- the exceptional performance of the binderless tungsten carbide disclosed has the further advantage that a surface coating is often not needed, though, when coating with CND diamond, the hardness of the cutting edge can be increased while the WC is a better substrate material than commonly used WC-Co tool materials. Binderless WC shows excellent high temperature 135 - strength and by using protective atmosphere during machining higher operation temperatures can be tolerated utilizing the fact that many work piece materials soften at temperatures above 800 °C.
- a further advantage of the disclosed material is the broad spectrum of work materials that can 140 be machined, ranging from metals to plastics, metal-matrix composites, some ceramics and rocks and wood products.
- tungsten carbide powder whose composition is stoichiometric. Stoichiometric powders show less grain growth during sintering than non- stoichiometric powders.
- the microstructure - and therefore the toughness - of the WC can be improved by 165 introducing minor quantities of vanadium carbide, chromium carbide, silicon carbide whisker or single-walled carbon nanotubes into the WC powder batch.
- Additions should be less than 5 vol% - with an optimum between 0.1 and 2 vol% for NC or Cr 2 O 3 - and 5-15% for SiC- whiskers.
- Carbon Nanotubes should be added on a 1- 5 vol% level.
- VC and Cr 2 O 3 act primarily as grain growth inhibitors, thus refining the WC mean grain size.
- Their particle size 170 _ should be below 0.5 ⁇ m, ideally below 0.1 ⁇ m.
- SiC platelets, whiskers or fibers are added in order to further increase the fracture toughness, therefore a particle diameter larger than the mean WC particle size is tolerable but a high aspect ratio desirable.
- Carbon nanotubes with a diameters around 0.001 ⁇ m and a lengths of 1-5 ⁇ m appear to have a combined effect of grain size refinement and fracture toughness increase. It is essential to use purified, metal-free single- 175 walled nanotubes with a low contamination of secondary carbon phases.
- the die set was placed into an experimental hot-press modified in such a way that heating was 190 performed by running an AC current through the water-cooled rams and through the die set. Temperature was feedback controlled by a calibrated pyrometer measuring the center portion of the die surface.
- the die-set was pre-loaded with 70 MPa uniaxial pressure and twice flushed with argon gas (99.99%) and evacuated down to a final gas pressure of 10 "2 Pa before heat was switched on.
- a number of evaluation experiments were carried out to find a suitable heating 195 profile. The following profile was subsequently used for making the cutting tool material:
- Density was measured by the Archimedes method and found to be 98. 9% rel. density
- Rectangular tool inserts were prepared from the sintered WC according to ISO specifications.
- Commercial reference samples of WC-Co and CB were according to CSDPR2525F12, and 215 CRDCR2225F10, respectively.
- the lathe was capable to maintain a constant cutting speed by continuously adjusting the rotational speed as the diameter of the work piece changed.
- Tool holders T-MAX (manufactured by Sandvik Coromant, Sweden). 230 The time required to produce a flank wear (N B ) of 0.4 mm was chosen as the wear criterion and measured by a microscope with 1 ⁇ m optical resolution, mounted on the lathe.
- WC-Co BK8 (manufactured by Kirovogradskij Plant of Hard Alloys, Ukraine, containing 8% Co, WC particle size 1-2 ⁇ m). 2)Al 2 O 3 cutting tool HC1 (manufactured by Nippon Technical Ceramics, Japan) 3) cBN based cutting tool Geksanit-P (manufactued by Poltavskij Diamond Plant, Ukraine, comparable to Amborite). 250 Tool orientations/geometries:
- Disclosed WC tool and WC-Co reference tool cutting edge angle: 45 °, face cutting edge angle: 45°, tool rake angle: 6°, tool cutting edge inclination angle: 0°. 255 Alumina and Geksanit-P tool, as above, but tool rake angle: -6°.
- the table below shows cutting parameter and the time in minutes required to reach 0.4 mm wear on turning of XI 2M steel and interrupted cutting of 18XGT steel.
- the WC-Co tool showed a tendency of build-up during rough turning.
- the character of wear for the disclosed binderless WC is typically abrasive and appears to be more resistant to 280 adhesive wear than WC-Co.
- For interrupted cutting the disclosed binderless WC tool is still substantially superior to WC-Co, and almost equal with the cBN reference tool.
- the table below shows cutting parameters and the time in minutes required to reach 0.4 mm wear for other metals/alloys.
- Cutting speed /m/min 100 300 500 300 300 150 Feed rate mm rev 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Depth of cut 2 2 2 2 2 2 2 2
- the disclosed WC outperformed WC-Co and Alumina under all conditions applied (in terms of wear resistance) thus exhibiting a large versatility in use with respect to work piece materials and cutting conditions.
- WC-Co (BK8) disclosed WC
- the disclosed WC is significantly more effective in obtaining a good surface finish than the WC-Co tool.
- Example 1 A tungsten carbide tool manufactured and prepared as described in Example 1 was tested against a Valenite VC730 PCBN cutting tool.
- the latter is made from a PCBN material 345 containing approximately 50 vol% of ultrahard cBN grains (which is less than in Geksanit-P or Amborite).
- Testing equipment, tool geometry and cutting angles were the same as in Example 1. Tests were carried out on heat treated steel and grey cast iron, with results shown in the table below.
- Feed rate 0.1 mm/rev
- depth of cut 0.5 mm. Shown is the time to reach a wear of 0.4 mm.
- Coolant used as in Example 1. work material cutting speed wear time / disci. WC wear time/ NC730 m/min min min
- tungsten carbide powder 60 g was milled with 90 g cobalt-free tungsten carbide balls (average diameter: 4 mm) in n-hexane for ca. 170 hrs on a roller bar mill. 3 ml of the slurry- was filled into a die set for pressure filtration and consolidated for ca. 20 min into a solid tablet 375 of 20 mm under a constant pressure of 5 MPa. The tablet was dried at ambient conditions for 3 hrs and then for another 2 hrs at 400 °C in a vacuum furnace (10 "3 Pa).
- a laboratory-type microwave furnace operating at 2.45 GHz (single mode) was available with a programmable, continuous wave power output up to 1100 W.
- the furnace was 380 equipped with a tunable microwave cavity containing a specimen compartment suitable for operation under controlled atmosphere and reduced pressures.
- the specimen was placed in a porous zirconia crucible (ca. 80-85% porosity) which was covered with a zirconia lid.
- the zirconia lid contained a 4 mm hole for monitoring the temperature by a 2-color pyrometer through an optical port.
- the specimen compartment was evacuated to a pressure of ca. 10 "3 Pa. 25
- Example 400 The wear behavior and cutting performance improved noticeably compared to similar conditions in Example 1. This is attributed to the somewhat finer grain size. The micro structure showed less coarsening, which is attributed to the wet powder processing and the more pronounced in-situ heating of the specimen.
- An ultrafme grained fraction of WC with a particle size of approximately 80 nm was produced from the powder used in Example 1 by dispersing and separating large particles from fines by sedimentation. The re-concentrated dispersion of nano-particles was pressure filtrated to 410 produce a green compact for sintering.
- test specimens For comparison, another set of specimens (referred to as “reference specimens”) was processed into green compacts as detailed in Example 3.
- micro structure refinement shows a tremendous improvement of mechanical properties and wear resistance over micron and submicron particle sizes.
- wear behavior 450 of the disclosed WC becomes comparable with superabrasives.
- Example 5 Grain size refinement by using grain growth inhibitors
- Example 3 Using the powder processing procedure for producing a green compact as described in 455 Example 3, 2 vol % of a nanosized Cr 2 C 3 (mean grain size 80nm as determined by X-ray techniques and scanning electron microscopy) was added as a grain growth inhibitor and sintered as under the conditions described in Example 3 (for maximum temperature see table below). A second specimen was produced in the same way but containing nanosized NC (60 nm mean particle size, as determined by X-ray techniques and scanning electron microscopy). 460 A third specimen was produced with a volume fraction of 5% opened, purified and dispersed, single-walled carbon nano-tubes (average length: 2 ⁇ m)
- Example 1 Hardness and toughness measurements, grain size and micro structure evaluation, and wear tests (on X12M steel) were carried out as stated in Example 1.
- Example 1 was tested under the conditions given in Example 2, using Steel 40XHRC50 as the work material.
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- General Physics & Mathematics (AREA)
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Abstract
Description
Claims
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AU2003267058A AU2003267058A1 (en) | 2003-09-08 | 2003-09-08 | Tungsten carbide cutting tool material |
PCT/EP2003/009936 WO2005023729A1 (en) | 2003-09-08 | 2003-09-08 | Tungsten carbide cutting tool material |
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PCT/EP2003/009936 WO2005023729A1 (en) | 2003-09-08 | 2003-09-08 | Tungsten carbide cutting tool material |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100451145C (en) * | 2007-05-21 | 2009-01-14 | 陈兆盈 | Vacuum high temperature treatment method for reducing oxygen content of electric dissolving regeneration WC |
CN101823882A (en) * | 2010-03-30 | 2010-09-08 | 河南新大新材料股份有限公司 | Silicon carbide/tungsten carbide composite material and preparation method thereof |
US20120125694A1 (en) * | 2010-11-24 | 2012-05-24 | Kennametal Inc. | Matrix Powder System and Composite Materials and Articles Made Therefrom |
CN104726757A (en) * | 2013-12-20 | 2015-06-24 | 北京有色金属研究总院 | Preparation method of binding phase-free ultrafine hard alloy |
CN105821275A (en) * | 2015-01-04 | 2016-08-03 | 山东科技大学 | Induction heating synthetic method of tungsten carbide alloy block |
CN109732088A (en) * | 2019-03-12 | 2019-05-10 | 徐菡 | A kind of novel composite ceramic that thermal shock resistance is high and its processing technology |
TWI671276B (en) * | 2014-03-26 | 2019-09-11 | 日商Jx日鑛日石金屬股份有限公司 | Sputter target composed of tungsten carbide or titanium carbide, and a method of manufacturing the same |
CN111842920A (en) * | 2020-08-04 | 2020-10-30 | 厦门理工学院 | Nanoscale high-performance hard alloy inhibitor and preparation method thereof |
CN111943702A (en) * | 2020-07-28 | 2020-11-17 | 华南理工大学 | In-situ synthesized beta-SIALON whisker toughened tungsten carbide composite material and preparation method and application thereof |
CN113173789A (en) * | 2021-03-30 | 2021-07-27 | 四川科力特硬质合金股份有限公司 | Non-binding phase corrosion-resistant hard alloy and production process and application thereof |
CN114277298A (en) * | 2020-09-27 | 2022-04-05 | 四川大学 | Graphene/nano Al adding method2O3WC-Co hard alloy of particles and preparation method |
CN115261697A (en) * | 2022-08-09 | 2022-11-01 | 成都广大精微新材料有限公司 | High-performance wedge-shaped cleaver for wire bonding and manufacturing method thereof |
-
2003
- 2003-09-08 AU AU2003267058A patent/AU2003267058A1/en not_active Abandoned
- 2003-09-08 WO PCT/EP2003/009936 patent/WO2005023729A1/en active Application Filing
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ARENAS F ET AL: "INFLUENCE OF POWDER GRANULOMETRY ON THE SINTERING OF BINDERLESS TUNGSTEN CARBIDE", KEY ENGINEERING MATERIALS, AEDERMANNSDORF, CH, vol. 206-213, no. 1, 13 September 2001 (2001-09-13), pages 179 - 182, XP001157158 * |
MORIGUCHI H ET AL: "ULTRAFINE GRAINED CEMENTED CARBIDES SINTERED BY PULSE CURRENT PROCESS", POWDER METALLURGY, METALS SOCIETY. LONDON, GB, vol. 43, no. 1, 2000, pages 17 - 19, XP000932915, ISSN: 0032-5899 * |
OMORI MAMORU: "Sintering, consolidation, reaction and crystal growth by the spark plasma system (SPS)", MATER SCI ENG A STRUCT MATER PROP MICROSTRUCT PROCESS; MATERIALS SCIENCE AND ENGINEERING A: STRUCTURAL MATERIALS: PROPERTIES, MICROSTRUCTURE AND PROCESSING 2000 ELSEVIER SEQUOIA SA, LAUSANNE, SWITZERLAND, vol. 287, no. 2, 2000, pages 183 - 188, XP002272682 * |
Cited By (16)
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CN100451145C (en) * | 2007-05-21 | 2009-01-14 | 陈兆盈 | Vacuum high temperature treatment method for reducing oxygen content of electric dissolving regeneration WC |
CN101823882A (en) * | 2010-03-30 | 2010-09-08 | 河南新大新材料股份有限公司 | Silicon carbide/tungsten carbide composite material and preparation method thereof |
CN101823882B (en) * | 2010-03-30 | 2011-06-15 | 河南新大新材料股份有限公司 | Silicon carbide/tungsten carbide composite material and preparation method thereof |
US20120125694A1 (en) * | 2010-11-24 | 2012-05-24 | Kennametal Inc. | Matrix Powder System and Composite Materials and Articles Made Therefrom |
US9056799B2 (en) * | 2010-11-24 | 2015-06-16 | Kennametal Inc. | Matrix powder system and composite materials and articles made therefrom |
CN104726757A (en) * | 2013-12-20 | 2015-06-24 | 北京有色金属研究总院 | Preparation method of binding phase-free ultrafine hard alloy |
TWI671276B (en) * | 2014-03-26 | 2019-09-11 | 日商Jx日鑛日石金屬股份有限公司 | Sputter target composed of tungsten carbide or titanium carbide, and a method of manufacturing the same |
CN105821275A (en) * | 2015-01-04 | 2016-08-03 | 山东科技大学 | Induction heating synthetic method of tungsten carbide alloy block |
CN109732088A (en) * | 2019-03-12 | 2019-05-10 | 徐菡 | A kind of novel composite ceramic that thermal shock resistance is high and its processing technology |
CN111943702A (en) * | 2020-07-28 | 2020-11-17 | 华南理工大学 | In-situ synthesized beta-SIALON whisker toughened tungsten carbide composite material and preparation method and application thereof |
CN111943702B (en) * | 2020-07-28 | 2022-02-15 | 华南理工大学 | In-situ synthesized beta-SIALON whisker toughened tungsten carbide composite material and preparation method and application thereof |
CN111842920A (en) * | 2020-08-04 | 2020-10-30 | 厦门理工学院 | Nanoscale high-performance hard alloy inhibitor and preparation method thereof |
CN114277298A (en) * | 2020-09-27 | 2022-04-05 | 四川大学 | Graphene/nano Al adding method2O3WC-Co hard alloy of particles and preparation method |
CN113173789A (en) * | 2021-03-30 | 2021-07-27 | 四川科力特硬质合金股份有限公司 | Non-binding phase corrosion-resistant hard alloy and production process and application thereof |
CN113173789B (en) * | 2021-03-30 | 2023-04-18 | 四川科力特硬质合金股份有限公司 | Non-binding phase corrosion-resistant hard alloy and production process and application thereof |
CN115261697A (en) * | 2022-08-09 | 2022-11-01 | 成都广大精微新材料有限公司 | High-performance wedge-shaped cleaver for wire bonding and manufacturing method thereof |
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