EP1581663A2 - Corps moule de metal dur - Google Patents
Corps moule de metal durInfo
- Publication number
- EP1581663A2 EP1581663A2 EP03815057A EP03815057A EP1581663A2 EP 1581663 A2 EP1581663 A2 EP 1581663A2 EP 03815057 A EP03815057 A EP 03815057A EP 03815057 A EP03815057 A EP 03815057A EP 1581663 A2 EP1581663 A2 EP 1581663A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- binder
- tungsten carbide
- body according
- molded body
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 26
- 239000002184 metal Substances 0.000 title claims abstract description 26
- 239000011230 binding agent Substances 0.000 claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 23
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000010941 cobalt Substances 0.000 claims abstract description 12
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 12
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 7
- 150000004767 nitrides Chemical class 0.000 claims description 7
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 claims description 2
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 claims description 2
- 229910003468 tantalcarbide Inorganic materials 0.000 claims description 2
- 229910003470 tongbaite Inorganic materials 0.000 claims description 2
- YPFNIPKMNMDDDB-UHFFFAOYSA-K 2-[2-[bis(carboxylatomethyl)amino]ethyl-(2-hydroxyethyl)amino]acetate;iron(3+) Chemical compound [Fe+3].OCCN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O YPFNIPKMNMDDDB-UHFFFAOYSA-K 0.000 claims 1
- -1 carbides nitrides Chemical class 0.000 claims 1
- 239000000463 material Substances 0.000 description 10
- 150000002739 metals Chemical class 0.000 description 7
- 150000001247 metal acetylides Chemical class 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910001092 metal group alloy Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910003271 Ni-Fe Inorganic materials 0.000 description 2
- 229910009043 WC-Co Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- 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
Definitions
- the invention relates to a hard metal molding and in particular to a screwdriver tip (bit) containing a tungsten carbide hard metal.
- Tungsten carbide moldings and in particular screwdriver tips are currently made from steel alloys. Due to the low wear resistance of this material, there is a high demand for more wear-resistant materials. Hard metals are generally suitable as wear-resistant materials because of their high hardness and high wear resistance.
- tungsten carbide WC
- These alloys exist like the classic tungsten carbide hard metals; however, the cobalt binder is replaced by a complex binder alloy consisting essentially of iron, cobalt and nickel.
- CERMETS sintered hard metal moldings
- Co-Ni-Fe binders consist of about 40 to 90% by weight cobalt and the rest essentially consist of nickel and iron, the contents being nickel and iron at most. 36% by weight with a Ni-Fe ratio of about 1.5: 1 to 1: 1.5.
- Such cemented carbide bodies are used as cutting inserts and indexable inserts, but are less suitable as a material for screwdriver tips because of their very low torque.
- Tungsten carbide-hard metal alloys containing an alloy binder made of iron, cobalt and nickel have already been described for woodworking.
- DE 296 17 040 U1 describes a tungsten carbide hard alloy with a binder system made of iron, cobalt and nickel and a WC grain size ⁇ 1 ⁇ m, the total binder content of the binder system being 3 to 30% by weight and the proportion of iron in the Binder system> than 50 wt .-%.
- the invention is based on the object of providing hard metal moldings, in particular screwdriver tips, from a material which combines the high strength and corrosion resistance of classic hard metal alloys with the toughness and torque resistance of steels in such a way that the future DIN requirements for torque resistance, in particular of Screwdriver tips met.
- the object is achieved according to the invention by shaped hard metal bodies containing, in particular, 55 to 85% by weight of tungsten carbide with a grain size in the range from 0.1 ⁇ m to 6.0 ⁇ m in the sintered state and 15 to 45% by weight. % of a binder, the binder containing at least 50% by weight of iron, 2 to 40% by weight of cobalt and 5 to 40% by weight of nickel.
- a characteristic of the hard metal used in this way is its significantly improved ability compared to classic hard metals.
- the toughness is determined, for example, with the help of the Palmquist measurement: the K ⁇ C values determined therefrom reached values of 20 to 25 MPa-m 1/2 , while values of 15 MPa-m 1 2 are achieved in classic hard metal alloys.
- the tungsten carbide particularly advantageously has a grain size in the range from 0.2 ⁇ m to 6.0 ⁇ m in the sintered state, the shaped body preferably containing 20 to 40% by weight of the binder.
- the high iron content and, in particular, compliance with the upper limit for the cobalt content are necessary in order to counteract an otherwise embrittlement of the hard metal and to maintain the necessary high toughness.
- Carbon contents in WC-Fe alloys should be in a narrow range of +0.03% by weight in order to free and embrittle phases such as eta phases On the other hand to prevent carbon. Both phases lead to a partially extreme deterioration in the toughness properties.
- the possible carbon window is widened by the addition of cobalt and nickel. This makes the properties easier to adjust.
- the grain sizes of the tungsten carbide in the sintered state should preferably be ultrafine to coarse, i.e. H. 0.2 to 6.0 ⁇ m. Grain sizes of 0.6 to 4.0 ⁇ m are preferred. Particularly good values in terms of impact strength (KIc value) are achieved with grain sizes in the range from 1.0 to 4.0 ⁇ m and very particularly with grain sizes that are described as medium or coarse (> 1.3 ⁇ m) ,
- the proportion of tungsten carbide is 60% by weight to 80% by weight, in particular 70 to 75% by weight, and the binder proportion is accordingly 20% by weight to 40% by weight, in particular 25 to 30 wt .-% is. This ensures that maximum toughness combined with great hardness is achieved.
- the binder contains at least 50, preferably 60 to 85, very particularly preferably 70 to 80% by weight of iron, 5 to 15% by weight, preferably 5 to 10% by weight of cobalt and contains 5 to 25, preferably 10 to 20 wt .-% nickel. This is therefore particularly preferred.
- the quantitative characterization of the grain sizes of WC-Co hard metals is usually carried out as an area analysis of an etched cut (equivalent circle diameter). The real image can be reconstructed using image processing, so that the particle surfaces are evaluated using computer programs. For each grain, the computer maps a circular area corresponding to the area of the particle. The diameter of this circle is determined.
- this method evaluates a cut surface through the material, this method, in contrast to chord length measurement, in which a line is laid through the material, comes closer to the true spatial grain size distribution. This parameter should therefore correlate better with the material properties.
- a factor between 1.3 and 1.5 is generally given for converting the mean value from the area analysis into an average value from the linear analysis. However, this is only an approximation and depends on the shape of the grains.
- the hard metal molded body in particular a screwdriver tip, contains at least one carbide, nitride and / or carbonitride of at least one of the elements of groups IVa, Va and Via of the periodic table, which contains chemical elements, with the proviso that the total content of these carbides, nitrides and / or carbonitrides 0.1 to 4, in particular 0.2 to 2 wt .-%, based on the total proportion in the alloy.
- Carbides, nitrides or carbonitrides usually have the function that
- a particular advantage of the present invention is that the proportion of carbides, nitrides and carbonitrides is kept particularly low can, since the grain size hardly increases during the sintering process.
- Optimal wear resistance and hardness are achieved if the total content of the carbides, nitrides and / or carbonitrides is in the specified range, in particular if the content of vanadium carbide is 0.05 to 1% by weight, the content of the alloy in tantalum carbide is 0.2% to 10 wt .-% and the chromium carbide content is 0.2 to 5 wt .-%, each based on the binder.
- the absolute content of carbides, nitrides and carbonitrides is in each case dependent on the respective binder and is therefore given in% by weight, based on the binder.
- the hard metals described above can in principle be used as a material in applications in which a similar optimization of wear resistance, hardness and toughness or torque resistance is required. Such applications are, for example, screwdriver tips.
- screwdriver tips according to the invention consist of the hard metal molded body only in the area of application (head) or, for example, has a hard metal coating on steel is advantageous and most inexpensive.
- an area of application (head) made of hard metal can be soldered onto a carrier.
- a screwdriver tip made of the hard metal for example made of injection molding, is particularly preferred.
- Screwdriver tips (bits) in dimensions PZ2 were made from a complex binder alloy consisting of 80% by weight of the WC and 20% by weight of the binder according to Example 1. These screwdriver tips achieved a torque value of 11.5 - 12 Nm in the torsion test, and thus met the minimum requirements of 11.3 Nm specified in DIN 5261.
- Screwdriver tips (bits) of dimension PZ2 made with a classic WC-Co alloy, containing 85% by weight WC and 15% by weight Co with a grain size of the WC of 2-3 ⁇ m in the sintered state, achieved torque values in the torsion test of 8 Nm. This means that only around 70% of the nominal value according to DIN 5261 of at least 11.3 Nm was achieved.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Glass Compositions (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10300420A DE10300420A1 (de) | 2003-01-09 | 2003-01-09 | Hartmetallformkörper |
| DE10300420 | 2003-01-09 | ||
| PCT/EP2003/014485 WO2004063408A2 (fr) | 2003-01-09 | 2003-12-18 | Corps moule de metal dur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1581663A2 true EP1581663A2 (fr) | 2005-10-05 |
| EP1581663B1 EP1581663B1 (fr) | 2011-02-16 |
Family
ID=32519730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03815057A Expired - Lifetime EP1581663B1 (fr) | 2003-01-09 | 2003-12-18 | Corps moule de metal dur |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1581663B1 (fr) |
| AT (1) | ATE498702T1 (fr) |
| AU (1) | AU2003296673A1 (fr) |
| DE (2) | DE10300420A1 (fr) |
| ES (1) | ES2361165T3 (fr) |
| WO (1) | WO2004063408A2 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1805338B1 (fr) * | 2004-10-29 | 2017-05-03 | SECO TOOLS AB (publ) | Carbure metallique fritté |
| DE102016207028A1 (de) * | 2016-04-26 | 2017-10-26 | H.C. Starck Gmbh | Hartmetall mit zähigkeitssteigerndem Gefüge |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816081A (en) * | 1973-01-26 | 1974-06-11 | Gen Electric | ABRASION RESISTANT CEMENTED TUNGSTEN CARBIDE BONDED WITH Fe-C-Ni-Co |
| RU2096513C1 (ru) * | 1991-04-10 | 1997-11-20 | Сандвик Актиеболаг | Способ получения спеченного изделия из твердого сплава |
| SE513740C2 (sv) * | 1995-12-22 | 2000-10-30 | Sandvik Ab | Slitstark hårmetallkropp främst för användning vid bergborrning och mineralbrytning |
| DE29617040U1 (de) * | 1996-10-01 | 1997-01-23 | United Hardmetal GmbH, 72160 Horb | WC-Hartlegierung |
| DE19907749A1 (de) * | 1999-02-23 | 2000-08-24 | Kennametal Inc | Gesinterter Hartmetallkörper und dessen Verwendung |
-
2003
- 2003-01-09 DE DE10300420A patent/DE10300420A1/de not_active Withdrawn
- 2003-12-18 AT AT03815057T patent/ATE498702T1/de active
- 2003-12-18 WO PCT/EP2003/014485 patent/WO2004063408A2/fr not_active Ceased
- 2003-12-18 EP EP03815057A patent/EP1581663B1/fr not_active Expired - Lifetime
- 2003-12-18 ES ES03815057T patent/ES2361165T3/es not_active Expired - Lifetime
- 2003-12-18 AU AU2003296673A patent/AU2003296673A1/en not_active Abandoned
- 2003-12-18 DE DE50313479T patent/DE50313479D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| LEO JAYA PRAKASH: "Weiterentwicklung von Wolframcarbid Hartmetallen unter Verwendung von Eisen-Basis-Bindelegierungen", 20 December 1979, FAKULTÄT FÜR MASCHINENBAU DER UNIVERSITÄT KARLSRUHE (TH), XP003027697 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50313479D1 (de) | 2011-03-31 |
| WO2004063408A3 (fr) | 2004-11-11 |
| ES2361165T3 (es) | 2011-06-14 |
| DE10300420A1 (de) | 2004-07-22 |
| AU2003296673A1 (en) | 2004-08-10 |
| EP1581663B1 (fr) | 2011-02-16 |
| WO2004063408A2 (fr) | 2004-07-29 |
| ATE498702T1 (de) | 2011-03-15 |
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