EP1742753B1 - Alloyed, non-oxidising metal powder - Google Patents

Alloyed, non-oxidising metal powder Download PDF

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Publication number
EP1742753B1
EP1742753B1 EP99935265A EP99935265A EP1742753B1 EP 1742753 B1 EP1742753 B1 EP 1742753B1 EP 99935265 A EP99935265 A EP 99935265A EP 99935265 A EP99935265 A EP 99935265A EP 1742753 B1 EP1742753 B1 EP 1742753B1
Authority
EP
European Patent Office
Prior art keywords
alloyed
powder
metal powder
atomised
carbide
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.)
Expired - Lifetime
Application number
EP99935265A
Other languages
German (de)
French (fr)
Other versions
EP1742753A1 (en
Inventor
Rutger Larsson
Erik Axmin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rutger Larson Konsult AB
Original Assignee
Rutger Larson Konsult AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rutger Larson Konsult AB filed Critical Rutger Larson Konsult AB
Priority to EP08153706A priority Critical patent/EP2163331A1/en
Publication of EP1742753A1 publication Critical patent/EP1742753A1/en
Application granted granted Critical
Publication of EP1742753B1 publication Critical patent/EP1742753B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid

Definitions

  • the present invention relates to an atomised, non-oxidising, alloyed metal powder based on iron enriched with carbide-bound carbon in the surface layer, and also to the use of the atomised, non-oxidising, alloyed metal powder.
  • metal powders are produced by means of atomising, electrolysis or through chemical or oxide reduction. Powder is used in mixtures for producing alloy compositions that are bound metallurgically upon sintering. Metallic and non-metallic powders can be combined to produce composite material having special properties.
  • the powder metallurgical composition most frequently used is iron powder, which is used in the manufacture of various structured parts. Iron powder is sometimes used alone or, which is more usual, together with various additives in order to improve the mechanical properties of compacted sintered products. Powder additives include carbon, copper, nickel and molybdenum.
  • US, A, 5,522,914 reveals an alloyed metal powder composed of 0.80 to 3.00 per cent by weight carbon, 0.20 to 2.00 per cent by weight manganese, 0.20 to 1.50 per cent by weight silicon, as well as 3.0 to 12.0 per cent by weight chromium, 0.20 to 0.30 per cent by weight sulphur, up to 0.04 per cent by weight phosphorous, 0.25 to 10.0 per cent by weight vanadium, up to 11.0 per cent by weight molybdenum, up to 18.00 per cent by weight mercury, up to 10 per cent by weight cobalt and up to 0.10 per cent by weight nitrogen, besides the iron.
  • the oxygen content in the powder is less than 0.025 per cent by weight.
  • the powder is produced by atomisation in nitrogen gas atmosphere in order to achieve a low oxygen content.
  • hydrocarbon which is partially carbonised during the atomisation process.
  • hydrocarbon is known through Swedish patent application 9601482-4 .
  • the atomised steel powder obtained has acquired enriched carbide-bound carbon in the surface layer, and a low oxygen content.
  • alloyed powder particles can be produced that include oxidation-sensitive alloying substances such as chromium, manganese, silicon.
  • nitrogen gas atmosphere can be avoided since the atmosphere in the atomising equipment is saturated with vaporised or carbonised atomising medium.
  • the present invention thus solves the problems of added oxygen and undesired nitrogen.
  • the atomised, alloyed metal powder according to the invention is non-oxidising as well as preventing oxidation. It has improved powder-metallurgical properties such as strength and toughness.
  • the carbide-bound carbon in the surface layer of the powder particles is enriched.
  • the non-oxidising, alloyed metal powder in accordance with the invention is given in claim 1. It comprises oxidation-sensitive alloying metals such as chromium and manganese, besides iron and carbide-bound carbon. These alloying metals are also capable of carbide-binding carbon.
  • Atomising medium used in the producion of the non-oxidising alloyed metal powder consists of hydrocarbons selected from the group comprising paraffin, diesel oils, or other cyclic or acyclic hydrocarbons that have been partially carbonised during the atomisation. Hydrogen gas is formed during the carbonisation of the hydrocarbons, as well as the carbides that are bound to the metals in the powder particles.
  • the atmosphere in the atomising vessel is saturated with vaporised or carbonised atomising medium consisting of hydrocarbons and hydrogen gas. The atmosphere is thus reducing, thereby protecting the powder particles produced.
  • the invention provides atomised, alloyed, non-oxidising metal powder based on iron with enriched carbide-bound carbon in the surface layer, that has been carbide-bound to the metal in the powder particles by carbonised atomising medium selected from the group comprising paraffin, diesel oils, or other cyclic or acyclic hydrocarbons during the atomising.
  • the size distribution in the powder particles is 45 to 200 ⁇ m.
  • Producing the atomised, alloyed, non-oxidising metal powder, based on iron with enriched carbide-bound carbon in the surface layer enables the manufacture of compacted sintered products such as toothed wheels, ball-bearings and tool steel. These products require high mechanical strength and toughness, and these properties are achieved since the alloying additives increase tempering quality and strength.
  • the products are manufactured by means of conventional powder metallurgical compressing, hot compacting and sintering, hot isostatic pressing and sinter forging.
  • the metal powder produced is non-oxidising and prevents oxidation it can be mixed with other powder produced from oxidation-sensitive metals. This enables the manufacture of composite material having completely new qualities.
  • the present invention thus also relates to the use of the atomised, alloyed, non-oxidising metal powder as claimed in claim 1 for the manufacture of compressed, sintered products, such as toothed wheels, ball-bearings, tool steel, manufactured by means of conventional powder-metallurgical compression, hot compacting and sintering, hot isostatic compacting and sinter forging.
  • alloyed, non-oxidising metal powder according to the invention was produced in accordance with the procedure described in Swedish patent application No. 9601482-4 . Paraffin was used as atomising medium in the experiments.
  • An alloyed metal powder with metal carbides in the surface layer was produced having 8.0 to 10 per cent by weight chromium, 8.0 to 10 per cent by weight manganese, 0.8 to 1.2 per cent by weight carbon and the remainder iron.
  • the powder produced is spherical and has a size distribution of between 45 and 200 ⁇ m.

Abstract

Powder mixture comprising a powder produced from oxidation sensitive metal and an atomised, alloyed, non-oxidising metal powder based on iron enriched with carbide-bound carbon in the surface layer that has been carbide-bound to the metals by carbonized atomized medium selected from the group comprising paraffin, diesel oils, or other cyclic or acyclic hydrocarbons. The powder particles of said non-oxidising metal powder comprise one or more of the alloying substances chromium, manganese or silicon.

Description

  • The present invention relates to an atomised, non-oxidising, alloyed metal powder based on iron enriched with carbide-bound carbon in the surface layer, and also to the use of the atomised, non-oxidising, alloyed metal powder.
  • Most metal powders are produced by means of atomising, electrolysis or through chemical or oxide reduction. Powder is used in mixtures for producing alloy compositions that are bound metallurgically upon sintering. Metallic and non-metallic powders can be combined to produce composite material having special properties.
  • The powder metallurgical composition most frequently used is iron powder, which is used in the manufacture of various structured parts. Iron powder is sometimes used alone or, which is more usual, together with various additives in order to improve the mechanical properties of compacted sintered products. Powder additives include carbon, copper, nickel and molybdenum.
  • US, A, 5,522,914 reveals an alloyed metal powder composed of 0.80 to 3.00 per cent by weight carbon, 0.20 to 2.00 per cent by weight manganese, 0.20 to 1.50 per cent by weight silicon, as well as 3.0 to 12.0 per cent by weight chromium, 0.20 to 0.30 per cent by weight sulphur, up to 0.04 per cent by weight phosphorous, 0.25 to 10.0 per cent by weight vanadium, up to 11.0 per cent by weight molybdenum, up to 18.00 per cent by weight mercury, up to 10 per cent by weight cobalt and up to 0.10 per cent by weight nitrogen, besides the iron. The oxygen content in the powder is less than 0.025 per cent by weight. The powder is produced by atomisation in nitrogen gas atmosphere in order to achieve a low oxygen content.
  • The problem in the production of metal powder is the oxygen content. A high oxygen content is unsuitable when metal powder is to be used for tools or other articles requiring high mechanical strength. In US, A, 5,522,914 the problem has been solved by atomising the powder in nitrogen gas atmosphere. This is expensive and results in undesired nitrogen being included in the alloyed powder produced.
  • The problem of the added nitrogen is solved by using hydrocarbon which is partially carbonised during the atomisation process. Such use of hydrocarbon is known through Swedish patent application 9601482-4 . The atomised steel powder obtained has acquired enriched carbide-bound carbon in the surface layer, and a low oxygen content.
  • It has now surprisingly been found that oxidation can be prevented by enriching the carbide-bound carbon in the surface layer. This means that alloyed powder particles can be produced that include oxidation-sensitive alloying substances such as chromium, manganese, silicon. Furthermore, the use of nitrogen gas atmosphere can be avoided since the atmosphere in the atomising equipment is saturated with vaporised or carbonised atomising medium.
  • The present invention thus solves the problems of added oxygen and undesired nitrogen. The atomised, alloyed metal powder according to the invention is non-oxidising as well as preventing oxidation. It has improved powder-metallurgical properties such as strength and toughness. The carbide-bound carbon in the surface layer of the powder particles is enriched.
    • Detailed description of the invention
  • The non-oxidising, alloyed metal powder in accordance with the invention is given in claim 1. It comprises oxidation-sensitive alloying metals such as chromium and manganese, besides iron and carbide-bound carbon. These alloying metals are also capable of carbide-binding carbon.
  • Atomising medium used in the producion of the non-oxidising alloyed metal powder consists of hydrocarbons selected from the group comprising paraffin, diesel oils, or other cyclic or acyclic hydrocarbons that have been partially carbonised during the atomisation. Hydrogen gas is formed during the carbonisation of the hydrocarbons, as well as the carbides that are bound to the metals in the powder particles. The atmosphere in the atomising vessel is saturated with vaporised or carbonised atomising medium consisting of hydrocarbons and hydrogen gas. The atmosphere is thus reducing, thereby protecting the powder particles produced.
  • The invention provides atomised, alloyed, non-oxidising metal powder based on iron with enriched carbide-bound carbon in the surface layer, that has been carbide-bound to the metal in the powder particles by carbonised atomising medium selected from the group comprising paraffin, diesel oils, or other cyclic or acyclic hydrocarbons during the atomising.
  • The size distribution in the powder particles is 45 to 200 µm.
  • Producing the atomised, alloyed, non-oxidising metal powder, based on iron with enriched carbide-bound carbon in the surface layer enables the manufacture of compacted sintered products such as toothed wheels, ball-bearings and tool steel. These products require high mechanical strength and toughness, and these properties are achieved since the alloying additives increase tempering quality and strength. The products are manufactured by means of conventional powder metallurgical compressing, hot compacting and sintering, hot isostatic pressing and sinter forging.
  • Since the metal powder produced is non-oxidising and prevents oxidation it can be mixed with other powder produced from oxidation-sensitive metals. This enables the manufacture of composite material having completely new qualities.
  • The present invention thus also relates to the use of the atomised, alloyed, non-oxidising metal powder as claimed in claim 1 for the manufacture of compressed, sintered products, such as toothed wheels, ball-bearings, tool steel, manufactured by means of conventional powder-metallurgical compression, hot compacting and sintering, hot isostatic compacting and sinter forging.
  • The present invention will be further illustrated with concrete examples which should not, however, be considered as limiting the scope of protection of the invention otherwise than as defined in the appended claims.
  • In the following example, alloyed, non-oxidising metal powder according to the invention was produced in accordance with the procedure described in Swedish patent application No. 9601482-4 . Paraffin was used as atomising medium in the experiments.
    • Example
  • An alloyed metal powder with metal carbides in the surface layer was produced having 8.0 to 10 per cent by weight chromium, 8.0 to 10 per cent by weight manganese, 0.8 to 1.2 per cent by weight carbon and the remainder iron. The powder produced is spherical and has a size distribution of between 45 and 200 µm.

Claims (3)

  1. An atomised, alloyed, non-oxidising metal powder based on iron enriched with carbide-bound carbon in the surface layer, that has been carbide-bound to the metals by carbonised atomised medium selected from the group comprising paraffin, diesel oils, or other cyclic or acyclic hydrocarbons characterised in that besides iron and the carbide bound carbon, the powder particles comprise 8.0-10% by weight of chromium, 8.0-10% by weight of manganese, 0.8-1.2% by weight of carbon and the remainder iron and in that the oxygen content is less than 200 ppm, and in that the particles are spherical and has a size distribution of between 45 and 200 µm.
  2. Use of the atomised, alloyed, non-oxidising metal powder according to claim 1 for the manufacture of compressed, sintered products such as toothed wheels, ball-bearings, tool steel, manufactured by means of conventional powder-metallurgical compression, hot compacting and sintering, hot isostatic compacting and sinter forgoing.
  3. Use of the atomised, alloyed, non-oxidising metal powder according to claim 1 for the manufacture of compressed, sintered alloyed products such a toothed wheels, ball-bearings, tool steel, together with iron powder.
EP99935265A 1998-08-06 1999-07-19 Alloyed, non-oxidising metal powder Expired - Lifetime EP1742753B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08153706A EP2163331A1 (en) 1998-08-06 1999-07-19 Alloyed, non-oxidising metal powder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9802682A SE521053C2 (en) 1998-08-06 1998-08-06 Use of an alloy non-oxidizing metal powder
PCT/SE1999/001293 WO2000007759A1 (en) 1998-08-06 1999-07-19 Alloyed, non-oxidising metal powder

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP08153706A Division EP2163331A1 (en) 1998-08-06 1999-07-19 Alloyed, non-oxidising metal powder

Publications (2)

Publication Number Publication Date
EP1742753A1 EP1742753A1 (en) 2007-01-17
EP1742753B1 true EP1742753B1 (en) 2008-07-30

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EP08153706A Withdrawn EP2163331A1 (en) 1998-08-06 1999-07-19 Alloyed, non-oxidising metal powder
EP99935265A Expired - Lifetime EP1742753B1 (en) 1998-08-06 1999-07-19 Alloyed, non-oxidising metal powder

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP08153706A Withdrawn EP2163331A1 (en) 1998-08-06 1999-07-19 Alloyed, non-oxidising metal powder

Country Status (7)

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EP (2) EP2163331A1 (en)
AT (1) ATE402773T1 (en)
AU (1) AU5077899A (en)
DE (1) DE69939230D1 (en)
ES (1) ES2310427T3 (en)
SE (1) SE521053C2 (en)
WO (1) WO2000007759A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100852497B1 (en) * 2007-03-12 2008-08-18 한양대학교 산학협력단 Fe based alloy having corrosion resistance and abrasion resistance and preparation method thereof
JP6227871B2 (en) * 2010-02-15 2017-11-08 フェデラル−モーグル・リミテッド・ライアビリティ・カンパニーＦｅｄｅｒａｌ−Ｍｏｇｕｌ Ｌｌｃ Master alloy for producing sintered hardened steel parts and process for producing sintered hardened parts
JP6229277B2 (en) * 2013-03-01 2017-11-15 日立化成株式会社 Sintered alloy and method for producing the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61276949A (en) * 1985-05-29 1986-12-06 Sumitomo Metal Ind Ltd Manufacture of sintered parts

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2220673C3 (en) * 1972-04-27 1979-10-04 Bayerisches Leichtmetallwerk Graf Bluecher Von Wahlstatt Kg, 8000 Muenchen Metallic sintered alloys, in particular sintered steel alloys
US5435827A (en) * 1991-08-07 1995-07-25 Erasteel Kloster Aktiebolag High speed steel manufactured by power metallurgy
US5522914A (en) * 1993-09-27 1996-06-04 Crucible Materials Corporation Sulfur-containing powder-metallurgy tool steel article
SE9402672D0 (en) * 1994-08-10 1994-08-10 Hoeganaes Ab Chromium containing materials having high tensile strength
SE509049C2 (en) * 1996-04-18 1998-11-30 Rutger Larsson Konsult Ab Process and plant for the production of atomized metal powder, metal powder and use of the metal powder
US9302818B2 (en) * 2011-11-22 2016-04-05 Robert Beadles Reusable envelope

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61276949A (en) * 1985-05-29 1986-12-06 Sumitomo Metal Ind Ltd Manufacture of sintered parts

Also Published As

Publication number Publication date
SE9802682D0 (en) 1998-08-06
SE9802682L (en) 2000-02-07
EP2163331A1 (en) 2010-03-17
ES2310427T3 (en) 2009-01-01
WO2000007759A1 (en) 2000-02-17
SE521053C2 (en) 2003-09-23
AU5077899A (en) 2000-02-28
EP1742753A1 (en) 2007-01-17
ATE402773T1 (en) 2008-08-15
DE69939230D1 (en) 2008-09-11

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