EP0204920B1 - Article with a high hardness and high tenacity for working metals, hard metals, ceramics and glasses - Google Patents
Article with a high hardness and high tenacity for working metals, hard metals, ceramics and glasses Download PDFInfo
- Publication number
- EP0204920B1 EP0204920B1 EP19860105056 EP86105056A EP0204920B1 EP 0204920 B1 EP0204920 B1 EP 0204920B1 EP 19860105056 EP19860105056 EP 19860105056 EP 86105056 A EP86105056 A EP 86105056A EP 0204920 B1 EP0204920 B1 EP 0204920B1
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- Prior art keywords
- metals
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- homogeneously mixed
- powder mixture
- glasses
- Prior art date
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- Expired
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- 229910052751 metal Inorganic materials 0.000 title claims description 22
- 239000002184 metal Substances 0.000 title claims description 22
- 150000002739 metals Chemical class 0.000 title claims description 14
- 239000000919 ceramic Substances 0.000 title claims description 4
- 239000011521 glass Substances 0.000 title claims description 4
- 229910052580 B4C Inorganic materials 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- 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
- C22C32/0047—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 carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
- C22C32/0057—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides based on B4C
-
- 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
-
- 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
- C22C29/062—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 B4C
Definitions
- the invention relates to a method for producing a shaped body with high hardness and high toughness from sintered boron carbide and a binder metal phase for the processing of metals, hard metals, ceramics and glasses.
- Boron carbide is particularly resistant to sandblasting. This opens up certain application possibilities for sintered bodies containing boron carbide. According to DE-C-973 807, these sintered bodies can be obtained by sintering boron carbide powder with a grain size of 0.1-30 ⁇ at temperatures of 1,600 to 2,000 ° C. under pressure.
- B4C particles are sintered with powder of the known binding metals cobalt or nickel, undesirable chemical reactions and the formation of further phases, for example borides, occur. As a result, the different properties of the phases that are already present and those that are forming can already cause cracks and gaps in the molded body during cooling.
- the invention was based on the object of presenting a simple process for the production of moldings based on B 4 C, in which the strength, in particular the toughness, compared to moldings made of pure B 4 C is increased and which are suitable for cutting or grinding tools or for applications , where mechanical wear loads or high surface pressures must be met, such as. B. in nozzles, particularly well suited.
- cutting platelets for machining or other shaped bodies for tools for grinding, honing, rubbing etc. of metals, in particular non-ferrous metals, hard metals, ceramics and glasses can be produced.
- Mo and W belong to the metals with low heat of formation of both metal borides and carbides.
- the lowest melting point of a Mo boride at 1,950 ° C, corresponding to 0.75 T Schm is already in the sintering region of Mo.
- the B 4 C is doped with carbon.
- 0.1 to 2.0% by weight of activated carbon, based on the product weight is homogeneously mixed into the powder mixture from step a) before step b).
- the compact can be heated to the sintering temperature and then introduced into the die. The final compact can be ejected hot from the die and then cooled.
- the sintering temperature is close to the upper range value.
- the hot pressing of Mo and B 4 C powders takes place at temperatures at which both materials are compressed but no molten phase occurs yet.
- the essence of the method according to the invention is the comparatively rapid execution of the hot pressing, in which even a very small proportion of the metal powder in the powder mixture is retained as the metallic phase in the molded product and embeds the B4C particles.
- Molded articles were produced: with 5% by volume Mo (corresponds to 20% by weight) and 95% by volume B 4 C; with 15 vol.% Mo and 85 vol.% B 4 C; and with 35 vol.% Mo (corresponds to 80 wt.%) and 65 vol.% B 4 C.
- the shaped articles produced according to the invention clearly show the separation of the embedded B4C particles (B 4 C dark, Mo light ⁇ from the surrounding Mo area. These differences are also confirmed in the scanning electron microscope and an X-ray scan of the same section. The X-ray fine structure analysis shows the metallic Mo in the compacts. The clear separation of B 4 C-containing areas and Mo-containing intermediate layers with thicknesses down to 3 ⁇ m was proven.
- Compacts were sintered using a semi-isostatic hot press with a compressive force of approx. 80 kN. Shaped articles were produced and tested, the Mo contents contained between 5% by volume and 35% by volume.
- the homogeneously mixed powders of molybdenum (37-140 ⁇ m) and boron carbide (0.1-1 360 ⁇ m) were placed in a graphite matrix. Square and round platelets were produced with punches movable from two sides under pressure of 10 and 30 MPa and at temperatures of 1,850 ° -2,000 ° C.
- the heating rates were between 100 and 200 ° C / min.
- the holding times were between 10 and 20 minutes.
- the cooling rates were in the range of 100-200 ° C / min.
- the moldings thus created were clamped in a tool holder and fastened in the steel holder of a lathe.
- Various steels, including austenites, were machined with the cutting inserts.
- AI 2 0 3 was processed with the same arrangement, it being possible to remove both over a large area and to achieve cuts.
- TaC and TiN surfaces could be removed.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Formkörpers mit hoher Härte und hoher Zähigkeit aus gesintertem Borkarbid und einer Bindemetallphase für die Bearbeitung von Metallen, Hartmetallen, Keramiken und Gläsern.The invention relates to a method for producing a shaped body with high hardness and high toughness from sintered boron carbide and a binder metal phase for the processing of metals, hard metals, ceramics and glasses.
Borkarbid ist gegen Sandstrahlen besonders widerstandsfähig. Dadurch eröffnen sich für borkarbidhaltige Sinterkörper gewisse Anwendungsmöglichkeiten. Diese Sinterkörper können nach der DE-C-973 807 durch Sintern von Borkarbidpulver mit einer Korngröße von 0,1-30 µ bei Temperaturen von 1 600 bis 2 000 °C unter Druck erhalten werden. Bei einem Vergleich der Verschieißwerte von Hartmetallen und Hartstoffen, bestimmt nach der Sandstrahlmethode, ist der Verschleißwert eines Sinterkörpers mit 95 Gew.- % Borkarbid (20 Gew.-% C) und 5 Gew.-% Fe gegenüber den Verschleißwerten von Sinterkörpern aus WC-Co oder TiC-Fe-Cr oder TiC-VC-Fe-Ni der niedrigste (R. K. Kieffer, P. Schwarzkopf "Hartstoffe und Hartmetalle., Springer-Verlag, 1953, Seiten 524 und 525). Borkarbid-Sinterkörper weisen allerdings eine geringe Bruchfestigkeit auf. An anderer Stelle dieser Druckschrift (Seite 327) wird erwähnt, daß Versuche, Borkarbid mit zähen Metallen abzubinden, gescheitert seien.Boron carbide is particularly resistant to sandblasting. This opens up certain application possibilities for sintered bodies containing boron carbide. According to DE-C-973 807, these sintered bodies can be obtained by sintering boron carbide powder with a grain size of 0.1-30 μ at temperatures of 1,600 to 2,000 ° C. under pressure. When the wear values of hard metals and hard materials are compared, determined using the sandblasting method, the wear value of a sintered body with 95% by weight boron carbide (20% by weight C) and 5% by weight Fe compared to the wear values of sintered bodies made of WC Co or TiC-Fe-Cr or TiC-VC-Fe-Ni the lowest (RK Kieffer, P. Schwarzkopf " Hartstoffe und Hartmetalle., Springer-Verlag, 1953, pages 524 and 525). However, boron carbide sintered bodies have a low breaking strength Elsewhere in this document (page 327) it is mentioned that attempts to set boron carbide with tough metals have failed.
Werden B4C-Partikel mit Pulver der bekannten Bindemetalle Cobalt oder Nickel gesintert, so kommt es zu unerwünschten chemischen Reakionen und zur Bildung von weiteren Phasen, beispielsweise von Boriden. Hierdurch können durch die unterschiedlichen Eigenschaften der bereits vorhandenen und der sich bildenden Phasen bereits beim Abkühlen Risse und Lücken im Formkörper entstehen.If B4C particles are sintered with powder of the known binding metals cobalt or nickel, undesirable chemical reactions and the formation of further phases, for example borides, occur. As a result, the different properties of the phases that are already present and those that are forming can already cause cracks and gaps in the molded body during cooling.
Der Erfindung lag die Aufgabe zugrunde, ein einfaches Verfahren zur Herstellung von Formkörpern auf B4C-Basis vorzustellen, bei welchen die Festigkeit, insbesondere die Zähigkeit gegenüber Formkörpern aus reinem B4C erhöht ist und die sich für Schneid- oder Schleifwerkzeuge oder für Anwendungen, bei denen mechanischen Verschleißbelastungen oder hohen Flächenpressungen begegnet werden muß, wie z. B. bei Düsen, besonders gut eignen. Mit dem erfindungsgemä-Ben Verfahren sollen Schneidplättchen für spanabhebende Bearbeitung oder andere Formkörper für Werkzeuge zum Schleifen, Honen, Reiben etc. von Metallen, insbesondere Nichteisenmetallen, von Hartmetallen, von Keramiken und von Gläsern hergestellt werden können.The invention was based on the object of presenting a simple process for the production of moldings based on B 4 C, in which the strength, in particular the toughness, compared to moldings made of pure B 4 C is increased and which are suitable for cutting or grinding tools or for applications , where mechanical wear loads or high surface pressures must be met, such as. B. in nozzles, particularly well suited. With the method according to the invention, cutting platelets for machining or other shaped bodies for tools for grinding, honing, rubbing etc. of metals, in particular non-ferrous metals, hard metals, ceramics and glasses, can be produced.
Die Aufgabe wird erfindungsgemäß durch ein Verfahren gelöst, bei dem ein Formkörper aus gesintertem Borkarbid und einer Bindemetallphase hergestellt wird wobei das B4C. undotiert oder mit Kohlenstoff bis 2,0 Gew.% dotiert, in einem Volumen-Anteil von wenigstens 65 Vol.% im Formkörper enthalten ist und der Bindemetallphasen-Anteil dem Restvolumen des Formkörpers im Bereich von 5-35 Vol.-% entspricht und in der Weise vorgegangen wird, daß
- a) B4C-Partikel von Korngrößen im Bereich von 1 µm bis 1 650 µm mit metallischem Pulver aus Mo und/oder W oder deren Legierungen mit anderen Metallen, deren Schmelzpunkt oberhalb der unteren Sintertemperaturgrenze von 1 000 °C liegt, und deren Legierungspartner keine flüssigen boridischen oder carbidischen Verbindungen im Sinterbereich von 1 800° bis 1 950 °C bilden, in einer Korngröße im Bereich zwischen 35 µm und 100 µm homogen gemischt werden,
- b) das Pulver in eine Graphit-Matrize eingefüllt wird,
- c) das Pulvergemisch auf eine Temperatur im Bereich von 1 800 °C bis 2 000 °C erhitzt, bei einem Druck von 100 N/mm2 bis 300 N/mm2 und einer Preßdauer zwischen 5 und 20 Minuten oder durch Schlagverdichten unter Schutzgas-Atmosphäre endverdichtet wird,
- d) danach mit einer Kühlrate zwischen 100° C/min. und 200° C/min. abgekühlt wird, wobei
- e) die Dauer des Aufheizens und Abkühlens insgesamt die Dauer des Pressens nach Schritt c) nicht übersteigt.
- a) B 4 C particles of grain sizes in the range from 1 μm to 1 650 μm with metallic powder of Mo and / or W or their alloys with other metals, the melting point of which is above the lower sintering temperature limit of 1,000 ° C., and their alloy partner do not form any liquid boride or carbide compounds in the sintering range from 1 800 ° to 1 950 ° C, are homogeneously mixed in a grain size in the range between 35 µm and 100 µm
- b) the powder is filled into a graphite matrix,
- c) the powder mixture is heated to a temperature in the range from 1,800 ° C. to 2,000 ° C., at a pressure of 100 N / mm 2 to 300 N / mm 2 and a pressing time between 5 and 20 minutes or by impact compression under protective gas Atmosphere is finally compressed,
- d) then with a cooling rate between 100 ° C / min. and 200 ° C / min. is cooled, whereby
- e) the total heating and cooling time does not exceed the pressing time after step c).
Die abhängigen Verfahrensansprüche geben vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens an.The dependent method claims indicate advantageous refinements of the method according to the invention.
Mo und W gehören zu den Metallen mit geringen Bildungswärmen sowohl der Metallboride als auch der Karbide. Der niedrigste Schmelzpunkt eines Mo-Borids liegt mit 1 950 °C, entsprechend 0,75 TSchm, bereits im Sinterbereich von Mo. Um ein feinkörniges Sintermaterial zu erhalten, wird das B4C mit Kohlenstoff dotiert. Hierzu wird dem Pulvergemisch aus Schritt a) 0,1 bis 2,0 Gew.-% aktivierter Kohlenstoff, bezogen auf das Produktgewicht, vor Schritt b) homogen zugemischt. Im Falle eines Vorpressens kann der Preßling auf die Sintertemperatur erhitzt und danach in die Matrize eingeführt werden. Der endverdichtete Preßling kann heiß aus der Matrize ausgestoßen und anschließend abgekühlt werden. Die Sintertemperatur liegt bei Kohlenstoffdotierung in der Nähe des oberen Bereichswertes. Das Heißpressen von Mo- und B4C-Pulvern erfolgt bei Temperaturen, bei denen beide Materialien verdichtet werden, aber noch keine schmelzflüssige Phase auftritt. Das Wesentliche des erfindungsgemäßen Verfahrens ist die verhältnismäßig schnelle Ausführung des Heißpressens, bei welcher auch ein noch so geringer Anteil des Metallpulvers im Pulvergemisch als metallische Phase im Formkörper-Produkt erhalten bleibt und die B4C-Partikel einbettet.Mo and W belong to the metals with low heat of formation of both metal borides and carbides. The lowest melting point of a Mo boride at 1,950 ° C, corresponding to 0.75 T Schm , is already in the sintering region of Mo. In order to obtain a fine-grained sintered material, the B 4 C is doped with carbon. For this purpose, 0.1 to 2.0% by weight of activated carbon, based on the product weight, is homogeneously mixed into the powder mixture from step a) before step b). In the case of pre-pressing, the compact can be heated to the sintering temperature and then introduced into the die. The final compact can be ejected hot from the die and then cooled. With carbon doping, the sintering temperature is close to the upper range value. The hot pressing of Mo and B 4 C powders takes place at temperatures at which both materials are compressed but no molten phase occurs yet. The essence of the method according to the invention is the comparatively rapid execution of the hot pressing, in which even a very small proportion of the metal powder in the powder mixture is retained as the metallic phase in the molded product and embeds the B4C particles.
Es wurden Formkörper hergestellt: mit 5 Vol.- % Mo (entspricht 20 Gew -%) und 95 Vol.-% B4C ; mit 15 Vol.-% Mo und 85 Vol.-% B4C ; und mit 35 Vol.-% Mo (entspricht 80 Gew.-%) und 65 Vol.-% B4C.Molded articles were produced: with 5% by volume Mo (corresponds to 20% by weight) and 95% by volume B 4 C; with 15 vol.% Mo and 85 vol.% B 4 C; and with 35 vol.% Mo (corresponds to 80 wt.%) and 65 vol.% B 4 C.
Die erfindungsgemäß hergestellten Formkörper zeigen im Anschliff deutlich die Trennung der eingebetteten B4C-Partikel (B4C dunkel, Mo hell} von dem umgebenden Mo-Bereich. Diese Unterschiede werden auch bei den Aufnahmen im Rasterelektronenmikroskop und einem Röntgenscan des gleichen Ausschnitts bestätigt. Mit der Röntgen-Feinstrukturanalyse läßt sich das metallische Mo in den Preßlingen nachweisen. Die eindeutige Trennung von B4C-haltigen Bereichen und Mo-haltigen Zwischenschichten mit Stärken bis herunter zu 3 µm wurde nachgewiesen.The shaped articles produced according to the invention clearly show the separation of the embedded B4C particles (B 4 C dark, Mo light} from the surrounding Mo area. These differences are also confirmed in the scanning electron microscope and an X-ray scan of the same section. The X-ray fine structure analysis shows the metallic Mo in the compacts. The clear separation of B 4 C-containing areas and Mo-containing intermediate layers with thicknesses down to 3 µm was proven.
Im folgenden wird ein Durchführungsbeispiel der Erfindung beschrieben.An exemplary embodiment of the invention is described below.
Mittels einer semiisostatischen Heißpresse mit einer Druckkraft von ca. 80 kN wurden Preßlinge gesintert. Es wurden Formkörper hergestellt und getestet, die Mo-Anteile enthielten zwischen 5 Vol.-% und 35 Vol.-%. Dazu wurden die homogen gemischten Pulver aus Molybdän (37-140 µm) und Borkarbid (0,1-1 360 µm) in eine Graphit-Matrize eingefüllt. Mit von zwei Seiten beweglichen Stempeln wurden unter Druck von 10 und 30 MPa und bei Temperaturen von 1 850°-2 000 °C viereckige und runde Plättchen hergestellt.Compacts were sintered using a semi-isostatic hot press with a compressive force of approx. 80 kN. Shaped articles were produced and tested, the Mo contents contained between 5% by volume and 35% by volume. For this purpose, the homogeneously mixed powders of molybdenum (37-140 µm) and boron carbide (0.1-1 360 µm) were placed in a graphite matrix. Square and round platelets were produced with punches movable from two sides under pressure of 10 and 30 MPa and at temperatures of 1,850 ° -2,000 ° C.
Die Aufheizgeschwindigkeiten betrugen zwischen 100 und 200° C/min. Die Haltezeiten lagen zwischen 10 und 20 min. Die Abkühlgeschwindigkeiten lagen im Bereich von 100-200° C/min.The heating rates were between 100 and 200 ° C / min. The holding times were between 10 and 20 minutes. The cooling rates were in the range of 100-200 ° C / min.
Das Preßverfahren ließ jedoch noch wesentlich höhere Abkühlgeschwindigkeiten zu.The pressing process, however, allowed much higher cooling rates.
Die so entstandenen Formkörper wurden in einen Werkzeugaufnehmer eingespannt und in Stahlhalter einer Drehbank befestigt. Mit den Schneidplatten wurden verschiedene Stähle, auch Austenite, spanabhebend bearbeitet.The moldings thus created were clamped in a tool holder and fastened in the steel holder of a lathe. Various steels, including austenites, were machined with the cutting inserts.
Im optischen Vergleich mit einer mit TiN beschichteten Hartstoffschneidwendeplatte war die Verschleißfestigkeit der Formkörper mit 10 bzw. 15 Vol.-% Mo viel besser.In optical comparison with a hard material cutting insert coated with TiN, the wear resistance of the moldings with 10 or 15% by volume Mo was much better.
Mit derselben Anordnung wurde AI203 bearbeitet, wobei sowohl großflächig abgetragen werden konnte, als auch Schnitte erzielt wurden. Außerdem ließen sich TaC- und TiN-Oberflächen abtragen.AI 2 0 3 was processed with the same arrangement, it being possible to remove both over a large area and to achieve cuts. In addition, TaC and TiN surfaces could be removed.
Claims (3)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3519710 | 1985-06-01 | ||
| DE19853519710 DE3519710A1 (en) | 1985-06-01 | 1985-06-01 | MOLDED BODY WITH HIGH HARDNESS AND HIGH TOUGHNESS FOR THE PROCESSING OF METALS, HARD METALS, CERAMICS AND GLASSES |
| EP86102025A EP0204067A1 (en) | 1985-06-01 | 1986-02-18 | Article with a high hardness and high tenacity for working metals, hard metals, ceramics and glasses |
| EP86102025 | 1986-02-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0204920A1 EP0204920A1 (en) | 1986-12-17 |
| EP0204920B1 true EP0204920B1 (en) | 1989-02-22 |
Family
ID=25832775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19860105056 Expired EP0204920B1 (en) | 1985-06-01 | 1986-04-12 | Article with a high hardness and high tenacity for working metals, hard metals, ceramics and glasses |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0204920B1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH226062A (en) * | 1940-09-07 | 1943-03-15 | P Hoffmann Fred | Tool for drilling, turning and the like. |
| DE973807C (en) * | 1942-04-19 | 1960-06-09 | Beteiligungs & Patentverw Gmbh | Process for the production of hard and wear-resistant utensils |
| FR1015543A (en) * | 1948-02-27 | 1952-10-14 | Plansee Metallwerk | Boron carbide sintered alloy |
| DE2451774A1 (en) * | 1973-11-02 | 1975-05-07 | Borax Cons Ltd | MOLDED BODY WITH IMPROVED WEAR RESISTANCE |
| US4400213A (en) * | 1981-02-03 | 1983-08-23 | Haskell Sheinberg | Novel hard compositions and methods of preparation |
| GB2143847B (en) * | 1983-07-26 | 1986-09-24 | Us Energy | Hard material |
-
1986
- 1986-04-12 EP EP19860105056 patent/EP0204920B1/en not_active Expired
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| Publication number | Publication date |
|---|---|
| EP0204920A1 (en) | 1986-12-17 |
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