DE748036C - Sintered hard material - Google Patents

Sintered hard material

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Publication number
DE748036C
DE748036C DEM149213D DEM0149213D DE748036C DE 748036 C DE748036 C DE 748036C DE M149213 D DEM149213 D DE M149213D DE M0149213 D DEM0149213 D DE M0149213D DE 748036 C DE748036 C DE 748036C
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Germany
Prior art keywords
oxide
iron
hard
mixture
hard material
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Expired
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DEM149213D
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German (de)
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Priority to DEM149213D priority Critical patent/DE748036C/en
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Publication of DE748036C publication Critical patent/DE748036C/en
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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64Burning or sintering processes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Description

Gesinterter Hartstoff Geigenstand der Erfindung ist ein gesinterter Hartstoff, der vorzugsweise seiner Hauptmenge nach aus einem harten Oxyd, wie Aluminiumoxyd, besteht, der Rest dagegen aus einem Bindemittel, .das aus Eisen oder einem ähnlichen Metall und Sauerstoff in :einer Zusammensetzung, die zwischen reinem Eisen und Eisenoxyd der Formel Fee 0s liegt, besteht. Es hat sich gezeigt, daß ein solches Bindemittel sehr feste harte Körper ergibt, anscheinend in der Weise, daß an der Trennunigsstelre zwischen Eisen und Aluminiumoxyd eine Schicht von Eisenoxyd durch Bildung von Mischkristallen mit Aluminiumoxyd eine gute Verbindung herstellt, während andererseits Ü"bergangs:stufen zwischen Eisenoxyd und Eisen sich bilden, die auch zum Metall eine gute Verbindung ergeben, während das Metall selbst dann vermutlich die eigentliche zähe und feste Bindung des Körpers ermöglicht. Mischungen von Aluminiumoxyd und Eisenoxyd ergeben bei der Sinterung jedenfalls nicht- ebenso günstige Resultate, ebensowenig tun 'dies Mischungen von Aluminiumoxyd und Eisenpulver.Sintered hard material violin stand of the invention is a sintered one Hard material, the main amount of which is preferably composed of a hard oxide such as aluminum oxide, consists, the rest, however, from a binding agent. That of iron or something similar Metal and Oxygen in: a composition between pure iron and iron oxide the formula fee 0s exists. It has been shown that such a binder results in very solid hard bodies, apparently in such a way that at the Trennunigsstelre between iron and aluminum oxide a layer of iron oxide through the formation of mixed crystals Establishes a good connection with aluminum oxide, while on the other hand transition: stages between iron oxide and iron, which also form a good bond with the metal result, while the metal itself is believed to be the actual tough and firm Binding of the body allows. Mixtures of aluminum oxide and iron oxide result in any case not equally favorable results in sintering, just as little do this Mixtures of aluminum oxide and iron powder.

Bei der Herstellung solcher Körper kann man verschiedene Wege einschlagen. Man kann aus einer Mischung, von Eisenpulver und Aluminiumoxyd Formkörper pressen und diese dann, vorzugsweise nach einer\7orsinterung in reduzierender Atmosphäre, in oxydierender Atmosphäre brennen. Nach der Vorsinterung kann gegebenenfalls eine endgültige Formgebung in bekannter Weise durch Feilen usw. eingeschaltet werden. Oder man stellt aus einer Mischung von, hartem Oxyd und Eisenoxyd durch Pressen Formkörper her und sintert diese in einer mäßig reduzierenden Atmosphäre, z. B. in Luft oder Stickstoff mit beigemischtem Kohlenoxyd oder Kohlenwasserstoff, vorzugsweise nachdem man vorher in oxydierender Atmosphäre vorgesintert-hat. Oder man sintert das harte Oxyd zusammen mit einer Mischung von Eisenpulver mit Eisenoxyd oder einem anderen Oxyd des Eisens in indifferenter Atmosphäre, oder man mischt das harte Oxyd mit Eisenoxydul oder Eisenoxyduloxyd oder einem Gemisch verschiedener Eisenoxyde und sintert, sei es in indifferenter, sei es in schwach reduzierender Atmosphäre. Eine weitere Möglichkeit besteht darin, daß Aluminiumoxyd nach Beimischung von wenig Eisenoxyd erhitzt wird, um eine Bindung zwischen beiden zu erzielenk,, und dann das erhaltene Pulver mit metäl.ll-; schem Eisen oder einem anderen Metall (Aluminium, Nickel) gemischt und gesintert wird, wobei je nach den Mischungsverhältnissen reduzierende, indifferente oder oxydierende Atmosphäre zweckmäßig sein kann. Allgemein gesprochen braucht das Bindemetall nicht dasselbe Metall zu sein wie in dem die Verbindung mit Alu-m,inilamoyd ,bewiikenden Metalloxyd.There are various ways of making such bodies. You can press moldings from a mixture of iron powder and aluminum oxide and then, preferably after sintering in a reducing atmosphere, burn in an oxidizing atmosphere. After pre-sintering, a final shape can be switched on in a known manner by filing, etc. Or a mixture of hard oxide and iron oxide is produced by pressing Molded bodies and sintered them in a moderately reducing atmosphere, e.g. B. in air or nitrogen with added carbon oxide or hydrocarbon, preferably after pre-sintering in an oxidizing atmosphere. Or you sinter the hard oxide together with a mixture of iron powder with iron oxide or one another oxide of iron in an indifferent atmosphere, or one mixes the hard oxide with iron oxide or iron oxide or a mixture of different Iron oxides and sinters, be it indifferent or weakly reducing The atmosphere. Another possibility is that aluminum oxide after admixture is heated by a little iron oxide in order to achieve a bond between the two. and then the powder obtained with metäl.ll-; iron or other metal (Aluminum, nickel) is mixed and sintered, depending on the mixing ratios reducing, indifferent or oxidizing atmosphere can be appropriate. Generally speaking, the binding metal need not be the same metal as that in which it is Combination with Alu-m, inilamoyd, coating metal oxide.

Als Beispiele seien gegeben: z. Eine Mischung von 8o1/0 Aluminiumoxyd. und 2o0/0 Eisenoxyd wird in mäßig reduzierender Atmosphäre gesintert.Examples are: A mixture of 8o1 / 0 aluminum oxide. and 2o0 / 0 iron oxide is sintered in a moderately reducing atmosphere.

2. Eine Mischung von 85"/, Aluminiumoxyd und i5% Eisenpulvcr wird in reduzierender Atmosphäre vorgesintert, dann in oxydierender Atmosphäre bei hoher Temperatur gebrannt, z. B. bei 1700°.2. A mixture of 85% aluminum oxide and 15% iron powder is made Pre-sintered in a reducing atmosphere, then in an oxidizing atmosphere at a high Burned temperature, e.g. B. at 1700 °.

Claims (6)

PATENTANSPRÜCHE: i. Gesinterter Hartstoff, bestehend aus einem harten Oxyd, wie Aluminiumoxyd, und. einem Bindemittel, dadurch gekennzeichnet, daß das Bind; mittel aus Eisen und Sauerstoff besteht und in seiner Zusammensetzung zwischen metallischem Eisen und Eisenoxyd der Formel Fe203 liegt. PATENT CLAIMS: i. Sintered hard material, consisting of a hard one Oxide, such as aluminum oxide, and. a binder, characterized in that the Bind; agent consists of iron and oxygen and in its composition between metallic iron and iron oxide of the formula Fe203. 2. Verfahren zur Herstellung von Hartstoff nach Anspruch i, dadurch gekennzeichnet, daß ein Gemisch von hartem Oxyd und Eisenpulver zu Formkörpern gepreßt und dann, vorzugsweise nach einer Sinterung in reduzierender Atmosphäre, in oxydierender Atmosphäre gebrannt wird. 2. Method of manufacture of hard material according to claim i, characterized in that a mixture of hard Oxide and iron powder are pressed into shaped bodies and then, preferably after sintering is fired in a reducing atmosphere, in an oxidizing atmosphere. 3. Verfahren zur Herstellung von Hartstoff nach Anspruch i, dadurch gekennzeichnet, daß ein Gemisch von hartem Oxyd und Eisenoxyd, vorzugsweise nach vorherigem Sintern in oxydierender Atmosphäre, in einer mäßig reduzierenden Atmosphäre gebrannt wird. q.. 3. Procedure for the production of hard material according to claim i, characterized in that a mixture of hard oxide and iron oxide, preferably after previous sintering in oxidizing Atmosphere, firing in a moderately reducing atmosphere. q .. Verfahren zur Herstellung von Hartstoff nach Anspruch i, dadurch Bekennzeichnet, daß ein Gemisch von hartem Oxyd:, Eisenpulver und Eisenoxyd oder einem anderen Oxyd des Eisens vorzugs-, weise in indifferenter Atmosphäre gesintert wird. procedure for the production of hard material according to claim i, characterized in that a mixture of hard oxide: iron powder and iron oxide or another oxide of iron preferably, is sintered wisely in an indifferent atmosphere. 5. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß ein Gemisch von hartem Oxyd mit Eisenoxydul oder E.isenoxyduloxyd oder einem Gemisch zweier verschiedener Eisenoxyde gesintert wird. 5. The method according to claim i, characterized in that a mixture of hard oxide with Eisenoxydul or E.isenoxyduloxyd or a mixture of two different iron oxides is sintered. 6. Gesinterter Hartstoff nach den Ansprüchen i bis 5, dadurch gekennzeichnet, daß entweder in den metallischen oder oxydischen Zusätzen das Eisen durch ähnlich wirkende andere Metalle ersetzt ist, z. B. Nickel, Aluminium. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand .der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden: deutsche Patentschriften .... Nr. 639:257, 687 397, 687 398 Fortschr. Mineral. Kristall. Petrogr. 20 (1936), S.245.6. Sintered hard material according to claims i to 5, characterized in that either in the metallic or oxidic additives the iron is replaced by other metals having a similar effect, e.g. B. nickel, aluminum. To distinguish the subject of the application from the state of the art, the following publications have been considered in the granting procedure: German patents .... No. 639: 257, 687 397, 687 398 Fortschr. Mineral. Crystal. Petrogr. 20 (1936), p.245.
DEM149213D 1940-11-24 1940-11-24 Sintered hard material Expired DE748036C (en)

Priority Applications (1)

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DEM149213D DE748036C (en) 1940-11-24 1940-11-24 Sintered hard material

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DEM149213D DE748036C (en) 1940-11-24 1940-11-24 Sintered hard material

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE935178C (en) * 1940-06-30 1955-11-10 Franz Dr Phil Dr Mont H Skaupy Hard body
DE935240C (en) * 1952-03-08 1955-11-17 Eisen & Stahlind Ag Sintered materials
DE937821C (en) * 1952-04-03 1956-01-19 Siemens Ag Extrusion press, in particular cable jacketing press
DE963766C (en) * 1948-10-13 1957-05-09 Onera (Off Nat Aerospatiale) Material from sintered mixtures of aluminum oxide and metals for parts of thermal power machines
DE1118078B (en) * 1958-02-05 1961-11-23 Degussa Hard material body and process for its production

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE639257C (en) * 1934-05-18 1936-12-02 Patra Patent Treuhand Process for the production of cutting tools for glass u. like
DE687398C (en) * 1938-03-19 1940-01-29 Fried Krupp Akt Ges
DE687397C (en) * 1937-06-22 1940-01-29 Fried Krupp Akt Ges

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE639257C (en) * 1934-05-18 1936-12-02 Patra Patent Treuhand Process for the production of cutting tools for glass u. like
DE687397C (en) * 1937-06-22 1940-01-29 Fried Krupp Akt Ges
DE687398C (en) * 1938-03-19 1940-01-29 Fried Krupp Akt Ges

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE935178C (en) * 1940-06-30 1955-11-10 Franz Dr Phil Dr Mont H Skaupy Hard body
DE963766C (en) * 1948-10-13 1957-05-09 Onera (Off Nat Aerospatiale) Material from sintered mixtures of aluminum oxide and metals for parts of thermal power machines
DE935240C (en) * 1952-03-08 1955-11-17 Eisen & Stahlind Ag Sintered materials
DE937821C (en) * 1952-04-03 1956-01-19 Siemens Ag Extrusion press, in particular cable jacketing press
DE1118078B (en) * 1958-02-05 1961-11-23 Degussa Hard material body and process for its production

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