WO2002063054A2 - Soil processing tool comprising a working element made of hard metal - Google Patents

Soil processing tool comprising a working element made of hard metal Download PDF

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Publication number
WO2002063054A2
WO2002063054A2 PCT/EP2002/000926 EP0200926W WO02063054A2 WO 2002063054 A2 WO2002063054 A2 WO 2002063054A2 EP 0200926 W EP0200926 W EP 0200926W WO 02063054 A2 WO02063054 A2 WO 02063054A2
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WO
WIPO (PCT)
Prior art keywords
nickel
cobalt
hard metal
chrome
working element
Prior art date
Application number
PCT/EP2002/000926
Other languages
German (de)
French (fr)
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WO2002063054A3 (en
Inventor
Roy Cooper
Original Assignee
Boart Longyear Gmbh & Co. Kg
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Publication date
Application filed by Boart Longyear Gmbh & Co. Kg filed Critical Boart Longyear Gmbh & Co. Kg
Priority to AU2002244685A priority Critical patent/AU2002244685A1/en
Publication of WO2002063054A2 publication Critical patent/WO2002063054A2/en
Publication of WO2002063054A3 publication Critical patent/WO2002063054A3/en

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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
    • 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

  • Earthworking tools typically found in coal mining and road grading processes, have cutting elements made from tungsten carbide bonded with cobalt.
  • the grain size of the tungsten carbide and the cobalt content can be changed in practice according to the usual industrial uses.
  • the content of the cobalt binder is usually between 6 and 15% by weight.
  • the grain size of the sintered tungsten carbide is typically 5 to 25 ⁇ m.
  • a plurality of earthworking tools are mounted on a rotating drum, and the tools are forced to engage the coal, rock, or road surface as the drum rotates. In this way, coal or rock is mined or the road surface is removed.
  • the carbide cutting element in the tool is the most expensive component and improvements in the service life offer the user great cost advantages.
  • an earth or tillage tool with an improved hard metal which has a binder with both cobalt and nickel or only nickel, each with chromium additives, is used with the aim of increasing hardness and wear resistance compared to hard metals with only cobalt as To achieve binders.
  • the hard metal bonded with nickel and chromium or alternatively with cobalt, nickel and chromium thus has increased abrasion resistance, fatigue strength and resistance to transverse fracture.
  • Cobalt / nickel binders and nickel binders have an fcc crystal structure compared to the mixed fcc / hcp structure of cobalt alone. This leads to increased transverse strength and fracture toughness.
  • Cobalt and nickel binders show strain hardening with plastic deformation, which also leads to improved transverse strength and fracture toughness.
  • N25NP - with 9.5% binder made from 6.65% cobalt, 2.85% nickel and 0.1% chromium gave the following properties compared to a carbide grade for scraping from the same tungsten carbide and 9.5% only cobalt as binder the following values:
  • the Co / Ni / Cr grade gives a 19% improvement in transverse crush resistance and a 26% improvement in abrasion resistance.

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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)
  • Earth Drilling (AREA)

Abstract

The invention relates to a soil or ground processing tool comprising an elongate body, wherein a working element made of hard metal is arranged on the front end thereof. Said inventive tool can be improved by the fact that the hard metal contains at least one hard material phase, e.g. WC, and a binding agent made of nickel/chrome or cobalt/nickel/chrome. The optionally added amount of chrome corresponds to 0 0.9 wt. %, preferably between 0.1 0.7 wt. %. The cobalt/nickel/chrome binding agent comprises 4 - 20 wt. % of the entire hard metal and the cobalt/nickel ratio is 90 Co: 10 Ni - 10 Co: 90 Ni, preferably 70 Co: 30 Ni - 50 Co: 50 Ni.

Description

Erdbearbeitungswerkzeuq mit einem Arbeitselement aus Hartmetall Earth working tools with a working element made of hard metal
Erdbearbeitungswerkzeuge, wie sie typischerweise im Kohlebergbau und bei Straßenplanierverfahren Anwendung finden, besitzen Schneidelemente, die aus mit Kobalt gebundenem Wolframkarbid hergestellt sind. Die Korngröße des Wolframkarbids und der Kobaltgehalt können nach den üblichen industriellen Einsätzen in der Praxis verändert werden. Der Gehalt des Kobaltbindemittels liegt üblicherweise zwischen 6 und 15 Gew.-%. Die Korngröße des gesinterten Wolframkarbids beträgt typischerweise 5 bis 25 μm.Earthworking tools, typically found in coal mining and road grading processes, have cutting elements made from tungsten carbide bonded with cobalt. The grain size of the tungsten carbide and the cobalt content can be changed in practice according to the usual industrial uses. The content of the cobalt binder is usually between 6 and 15% by weight. The grain size of the sintered tungsten carbide is typically 5 to 25 μm.
Im Arbeitseinsatz ist eine Mehrzahl von Erdbearbeitungswerkzeugen auf einer Drehtrommel angebracht, und die Werkzeuge werden beim Umlauf der Trommel zwangsweise in Eingriff mit der Kohle, dem Gestein oder der Straßenoberfläche gebracht. Auf diese Weise wird Kohle oder Gestein abgebaut bzw. die Straßenoberfläche abgetragen. Das Hartmetallschneidelement im Werkzeug ist das teuerste Bauteil und Verbesserungen in der Lebensdauer bieten dem Anwender große Kostenvorteile.In use, a plurality of earthworking tools are mounted on a rotating drum, and the tools are forced to engage the coal, rock, or road surface as the drum rotates. In this way, coal or rock is mined or the road surface is removed. The carbide cutting element in the tool is the most expensive component and improvements in the service life offer the user great cost advantages.
Aufgabe der Erfindung ist es daher, ein Erdverarbeitungswerkzeug in dieser Hinsicht zu verbessern. Gemäß der vorliegenden Erfindung wird ein Erd- oder Bodenbearbeitungswerkzeug mit einem verbesserten Hartmetall, das ein Bindemittel mit sowohl Kobald und Nickel oder nur Nickel, jeweils mit Chromzusätzen aufweist, mit dem Ziel verwendet, eine erhöhte Härte und Verschleißfestigkeit im Vergleich zu Hartmetallen mit nur Kobalt als Bindemittel zu erreichen. Bei einer äquivalenten Korngrößenverteilung des Wolframkarbids hat somit das mit Nickel und Chrom oder alternativ mit Kobalt, Nickel und Chrom gebundene Hartmetall eine erhöhte Abriebfestigkeit, Ermüdungsfestigkeit und Querbruchfestigkeit.The object of the invention is therefore to improve an earth processing tool in this regard. According to the present invention, an earth or tillage tool with an improved hard metal, which has a binder with both cobalt and nickel or only nickel, each with chromium additives, is used with the aim of increasing hardness and wear resistance compared to hard metals with only cobalt as To achieve binders. With an equivalent grain size distribution of the tungsten carbide, the hard metal bonded with nickel and chromium or alternatively with cobalt, nickel and chromium thus has increased abrasion resistance, fatigue strength and resistance to transverse fracture.
Die Vorteile eines Hartmetall-Bindemittels, das aus einem Gemisch von Kobalt/Nickel oder Kobalt/Nickel/Chrom besteht, sind im Vergleich mit den üblicherweise verwendeten Kobalt-Bindemitteln die folgenden:The advantages of a hard metal binder consisting of a mixture of cobalt / nickel or cobalt / nickel / chromium are the following in comparison with the cobalt binders commonly used:
1. Kobalt/Nickel-Bindemittel und Nickel-Bindemittel haben eine fcc-Kris- tallstruktur im Vergleich zu der gemischten fcc/hcp-Struktur von Kobalt allein. Dieses führt zu einer erhöhten Querbruchfestigkeit und Bruchzähigkeit.1. Cobalt / nickel binders and nickel binders have an fcc crystal structure compared to the mixed fcc / hcp structure of cobalt alone. This leads to increased transverse strength and fracture toughness.
2. Kobalt- und Nickel-Bindemittel zeigen eine Kaltverfestigung unter plastischer Verformung, auch dies führt zu einer verbesserten Querbruchfestigkeit und Bruchzähigkeit.2. Cobalt and nickel binders show strain hardening with plastic deformation, which also leads to improved transverse strength and fracture toughness.
3. Zusätze von Chrom führen zu einer Mischkristallverfestigung des Bindemittels, die ihrerseits die Querbruchfestigkeit und Bruchzähigkeit verbessert. 4. Die Verwendung von Nickel/Chrom- und Kobalt/Nickel/Chrom-Bindemitteln beeinflußt die Flüssigphasen-Sintereigenschaften des Hartmetalls, was zu einer gewissen Rundung der WC-Körner führt. Es zeigte sich, daß hierdurch das Ausmaß von oberflächennahen Brüchen der Wolframkarbidkörner beim Schneidvorgang verbessert wird, was erheblich zur Verschleißfestigkeit beiträgt.3. Additions of chromium lead to a solid solution hardening of the binder, which in turn improves the transverse strength and fracture toughness. 4. The use of nickel / chrome and cobalt / nickel / chrome binders influences the liquid phase sintering properties of the hard metal, which leads to a certain rounding of the WC grains. It was found that this improves the extent of fractures of the tungsten carbide grains near the surface during the cutting process, which contributes significantly to the wear resistance.
Zum Beispiel ergab eine Hartmetallsorte zum Schrammen - bezeichnet als N25NP - mit 9,5 % Bindemittel aus 6,65 % Kobalt, 2,85 % Nickel und 0,1 % Chrom die folgenden Eigenschaften im Vergleich zu einer Hartmetallsorte zum Schrammen aus dem gleichen Wolframkarbid und 9,5 % nur Kobalt als Bindemittel folgende Werte:For example, a carbide grade for scraping - referred to as N25NP - with 9.5% binder made from 6.65% cobalt, 2.85% nickel and 0.1% chromium gave the following properties compared to a carbide grade for scraping from the same tungsten carbide and 9.5% only cobalt as binder the following values:
Figure imgf000004_0001
Figure imgf000004_0001
Abriebtest gemäß ASTM-Bestimmung B 611-85Abrasion test according to ASTM determination B 611-85
Für die gleiche Härte ergibt, im Vergleich zu der nur mit Kobalt gebundenen Sorte, die Co/Ni/Cr-Sorte eine Verbesserung von 19 % in der Querbruchfestigkeit und eine Verbesserung von 26 % in der Abriebfestigkeit.For the same hardness, compared to the grade bound only with cobalt, the Co / Ni / Cr grade gives a 19% improvement in transverse crush resistance and a 26% improvement in abrasion resistance.
In durchgeführten Schneidversuchen in hartem Sandstein ohne Rotation, um schwere Schneidbedingungen zu simulieren, haben sowohl Nickel/Chrom- als auch die Nickel/Kobalt/Chrom-Sorten, wie durch den Abriebtest im Labor vorausgesagt, eine deutlich erhöhte Verschleißfestigkeit gezeigt.In hard sandstone, non-rotating cutting trials to simulate heavy cutting conditions, both nickel / chrome and The nickel / cobalt / chrome grades, as predicted by the abrasion test in the laboratory, also showed significantly increased wear resistance.
Dies zeigt Fig. 1 , in der B25N die herkömmliche mit 9,5 % Kobalt gebundene Sorte, N25NP die verbesserte Sorte mit 9,5 % Ni/Co/Cr-Bindemittel und N25NCr die verbesserte Sorte mit 9,5 % Ni/Cr-Bindemittel ist.This is shown in FIG. 1, in which B25N the conventional grade bound with 9.5% cobalt, N25NP the improved grade with 9.5% Ni / Co / Cr binder and N25NCr the improved grade with 9.5% Ni / Cr- Is binder.
Fig. 2 zeigt MikroStrukturen einer konventionellen mit Kobalt gebundenen Sorte B25N im Vergleich mit einer Nickel/Chrom-Sorte (N25N) und der Nickel/Kobalt/Chrom-Sorte (N25NP) bei 1000-facher Vergrößerung. Die Rundung der Wof ramkarbidkömer bei den beiden letzteren Sorten ist deutlich erkennbar. 2 shows microstructures of a conventional cobalt-bound grade B25N in comparison with a nickel / chrome grade (N25N) and the nickel / cobalt / chrome grade (N25NP) at a 1000-fold magnification. The rounding of the carbamide grains in the latter two types is clearly visible.

Claims

Patentansprüche claims
1. Erd- oder Bodenbearbeitungswerkzeug mit einem langgestreckten Körper und einem an dessen vorderem Ende angebrachten Arbeitselement aus Hartmetall, dadurch gekennzeichnet, daß das Hartmetall zumindest eine Hartstoffphase, wie WC, und ein Nickel/Chrom- oder Kobalt/Nickel/Chrom-Bindemittel enthält.1. earth or soil working tool with an elongated body and a working element attached to the front end of hard metal, characterized in that the hard metal contains at least one hard material phase, such as WC, and a nickel / chromium or cobalt / nickel / chromium binder.
2. Erd- oder Bodenbearbeitungswerkzeug nach Anspruch 1 , dadurch gekennzeichnet, daß das Hartmetall 4 bis 20 Gew.-% Kobalt/Nickel/Chrom-Bindemittel enthält mit Kobalt/Nickel-Verhältnissen von 90 Co : 10 Ni bis 10 Co : 90 Ni, vorzugsweise im Verhältnis von 70 Co : 30 Ni bis 50 Co : 50 Ni.2. earth or soil cultivation tool according to claim 1, characterized in that the hard metal contains 4 to 20 wt .-% cobalt / nickel / chromium binder with cobalt / nickel ratios of 90 Co: 10 Ni to 10 Co: 90 Ni, preferably in a ratio of 70 Co: 30 Ni to 50 Co: 50 Ni.
3. Erd- oder Bodenbearbeitungswerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet daß der Chromgehalt des Bindemittels 0 bis 0,9 Gew.- %, vorzugsweise 0,1 bis 0,7 Gew.-%, bezogen auf das Gesamtgewicht des Hartmetalls, beträgt. 3. earth or soil cultivation tool according to claim 1 or 2, characterized in that the chromium content of the binder is 0 to 0.9 wt .-%, preferably 0.1 to 0.7 wt .-%, based on the total weight of the hard metal ,
PCT/EP2002/000926 2001-02-02 2002-01-30 Soil processing tool comprising a working element made of hard metal WO2002063054A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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DE2001104736 DE10104736A1 (en) 2001-02-02 2001-02-02 Earth working tool with a hard metal working element
DE10104736.3 2001-02-02

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215510A (en) * 1963-10-02 1965-11-02 Gen Electric Alloy
US3628921A (en) * 1969-08-18 1971-12-21 Parker Pen Co Corrosion resistant binder for tungsten carbide materials and titanium carbide materials
US4684405A (en) * 1985-03-28 1987-08-04 Fried. Krupp Gmbh Sintered tungsten carbide material and manufacturing method
WO1992013112A1 (en) * 1991-01-25 1992-08-06 Sandvik Ab Corrosion resistant cemented carbide
US5305840A (en) * 1992-09-14 1994-04-26 Smith International, Inc. Rock bit with cobalt alloy cemented tungsten carbide inserts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215510A (en) * 1963-10-02 1965-11-02 Gen Electric Alloy
US3628921A (en) * 1969-08-18 1971-12-21 Parker Pen Co Corrosion resistant binder for tungsten carbide materials and titanium carbide materials
US4684405A (en) * 1985-03-28 1987-08-04 Fried. Krupp Gmbh Sintered tungsten carbide material and manufacturing method
WO1992013112A1 (en) * 1991-01-25 1992-08-06 Sandvik Ab Corrosion resistant cemented carbide
US5305840A (en) * 1992-09-14 1994-04-26 Smith International, Inc. Rock bit with cobalt alloy cemented tungsten carbide inserts

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WO2002063054A3 (en) 2002-10-24
DE10104736A1 (en) 2002-08-08
AU2002244685A1 (en) 2002-08-19

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