EP0521071B1 - Pulvriger zusatz zur verbesserung der bearbeitbarkeit und eisen- oder stahlpulver, die diesen pulvrigen zusatz enthalten - Google Patents

Pulvriger zusatz zur verbesserung der bearbeitbarkeit und eisen- oder stahlpulver, die diesen pulvrigen zusatz enthalten Download PDF

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Publication number
EP0521071B1
EP0521071B1 EP91906838A EP91906838A EP0521071B1 EP 0521071 B1 EP0521071 B1 EP 0521071B1 EP 91906838 A EP91906838 A EP 91906838A EP 91906838 A EP91906838 A EP 91906838A EP 0521071 B1 EP0521071 B1 EP 0521071B1
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EP
European Patent Office
Prior art keywords
powder
mns
compound
supplementary
steel
Prior art date
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Expired - Lifetime
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EP91906838A
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English (en)
French (fr)
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EP0521071A1 (de
Inventor
Per Engdahl
Mats Persson
Dragan Spasic
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Hoganas AB
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Hoganas AB
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Classifications

    • 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
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0221—Using a mixture of prealloyed powders or a master alloy comprising S or a sulfur compound

Definitions

  • the present invention relates to a machinability improving and/or wear-resistance improving supplementary powder for an iron- or steel-based powder for use in powder-metallurgical production of blanks.
  • the invention also relates to an iron- or steel-based powder containing such supplementary powder.
  • Powder-metallurgical production of blanks is frequently effected in the following process steps.
  • a basic powder usually an iron or steel powder
  • alloying elements such as nickel, copper, molybdenum and carbon
  • the powder mixture is compacted in a pressing die.
  • the raw blanks obtained in the compacting step are sintered so as to obtain their final properties in respect of strength etc.
  • the initial admixture of alloying elements gives powder metallurgy a unique opportunity of also adding other substances which, for example, improve the machinability of the material.
  • An example of this is shown in SE-C-8406054-0 or EP-A-0183 666 which describes how the machinability of a sintered steel can be improved by admixture of MnS in a steel powder.
  • the object of the present invention therefore is to provide a supplementary powder for an iron- or steel-based powder for use in powder-metallurgical production of blanks, said supplementary powder being adapted to improve the machinability and/or the wear-resistance of the blank produced.
  • this object can be achieved by a supplementary powder which consists of MnS and at least one compound selected from Te or a Te-compound, Se or an Se-compound.
  • This supplementary powder produces a substantially improved cuttability increasing effect as compared with a supplementary powder consisting of MnS only.
  • the inventive supplementary powder gives the blanks produced a superior machinability and also improves the wear-resistance of the blanks, without affecting other important properties of the material, such as dimensional changes of the blanks during sintering and their mechanical properties.
  • machinability is meant all existing working methods, such as drilling, turning, milling, grinding etc.
  • the improved machinability obtained by the supplementary powder according to the invention is unexpected, since in powder metallurgy any deformation of inclusions occurs isostatically during the compacting operation, and therefore the length/width ratio is the same after compacting.
  • the supplementary powder according to the present invention has an essentially greater machinability enhancing effect than a supplementary powder of MnS only must therefore be found in some other effect than the modified shape of the inclusions.
  • the supplementary powder according to the invention improves the lubricating effect in machining. This can also be a reason why the supplementary powder according to the invention has proved to be most efficient means of improving the wear-resistance of powder-metallurgically produced elements.
  • the supplementary powder according to the invention can be produced in different ways. Firstly, Te, a Te-compound, Se and/or and Se-compound can be alloyed with MnS by fusion of Mn, S, Te, a Te-compound, Se or and Se-compound, whereupon grinding is performed to the desired particle size. Secondly, an intimate mixture of particles of MnS and Te, a Te-compound, Se and/or an Se-compound can be performed by e.g. agglomeration or mechanical alloying, whereby all or substantially all particles in the powder will contain MnS and Te and/or Se. Thirdly, the supplementary powder according to the invention can be produced by mixing separate particles of MnS and Te, Te-compound, Se and/or and Se-compound.
  • the weight ratio between MnS and Te should suitably be in the range of 10-2000, preferably 50-1000.
  • the weight ratio between MnS and Se should suitably be in the range of 10-1000, preferably 10-500.
  • the weight ratio between MnS and Te should suitably be in the range of 20-4000, preferably 100-2000, and the weight ratio between MnS and Se in the range of 20-2000, preferably 20-1000.
  • an iron or steel powder for powder-metallurgical production of blanks having improved machinability and/or wear-resistance.
  • This powder is characterised according to the invention in that it contains a supplementary powder consisting of MnS and at least one compound selected from Te or a Te-compound, Se or an Se-compound.
  • the amount of MnS in the iron or steel powder should, according to the invention, suitably be in the range of 0.2-3% by weight and the weight ratio between MnS and Te in the range of 10-2000, preferably 50-1000.
  • the amount of MnS in the iron or steel powder should suitably be in the range of 0.2-3% by weight, and the weight ratio between MnS and Se in the range of 10-1000, preferably 10-500.
  • the amount of MnS in the iron or steel powder should suitably be in the range of 0.2-3% by weight, and the weight ratio between MnS and Te in the range of 20-4000, preferably 100-2000, and the weight ratio between MnS and Se in the range of 20-2000, preferably 20-1000.
  • Additives according to the invention consisting of a mixture of MnS and Se-particles, were prepared, the weight ratios between MnS and Te being as follows.
  • the particle size of the MnS and Te powders was less than 56 »m.
  • the additives containing MnS and Te have a superior machinability enhancing effect as compared with an additive containing MnS only.
  • the additive according to the invention appears to have the desired machinability improving effect even at very small amounts of Te in relation to MnS.
  • Te in relation to MnS
  • the weight ratio between MnS and Te is in the range of 200-1000, the other properties are affected but to a very small extent.
  • the weigth ratio between MnS and Te should thus be in the range of 10-2000, preferably 50-1000.
  • Additives according to the invention consisting of a mixture of MnS and Se-particles, were prepared, the weight ratios between MnS and Se being as follows.
  • the particle size of the MnS and Se powders was less than 56 »m.
  • additives were mixed with a commercially available, partially prealloyed steel powder containing 4% Ni, 1.5% Cu, 0.5% Mo and 0.5% C, in amounts of 0.5%.
  • the additive according to the invention consisting of MnS combined with Se does not appear to have the desired machinability improving effect until at a slightly lower quota between MnS and Se.
  • the weight ratio between MnS and Se should thus be in the range of 10-1000, preferably 10-500.
  • An additive consisting of a mixture of the additives C and J according to Examples 1 and 2, was added to the same, partially prealloyed powder as in Example 1 in the following ratio: 0.25% by weight of C and 0.25% by weight of J.
  • This Example shows the surprising synergistic effect obtained by adding a combination of MnS and Te and/or Se.
  • the additives consisted of MnS, Te or Se particles having a particle size of less than 56 »m. These additives were mixed with a commercially available, partially pre-alloyed steel powder containing 4% Ni, 1.5% Cu, 0.5% Mo and 0.5% C, in amounts corresponding to the individial total amounts of MnS and, respectively, Te and Se in the additives A, C and J. Additive Contents Added amount A MnS 0.5% M Te 0.0015% N Se 0.015% O - -
  • the additives A and C were added to four different powder-metallurgical materials.
  • Powder mixtures were prepared from a commercially available, partially prealloyed steel powder containing 4% Ni, 1.5% Mo and 0.5% C and different amounts of the additive C according to the invention.
  • This Example illustrates the improvement of the machinability, which is obtained when the amount of the additive C is increased in a powder-metallurgical material.
  • the additives A and C according to Example 1 were mixed with a pure iron powder in an amount of 1% by weight. To this iron powder, also the following ingredients/additives were added: 2% Cu, 20% addition of hard phase in the form of a commercially available high-speed steel powder M2. Samples were produced for testing the wear-resistance according to the Ogushi-method. Material Additive Amount (%) Wear index (mm3/kg,m) 5 A 1 7.28x10 ⁇ 10 6 C 1 2.53x10 ⁇ 10
  • the worn-off volume per force and distance is reduced to one third when the additive according to the invention is used instead of MnS only. It can be read from this Example that the additive C according to the invention has a very high effect on the wear-resistance of a powder-metallurgically produced material.
  • Te and/or Se-compounds instead of elementary Te and/or Se, the liability of the supplementary powder to dust and/or its poisonousness can be reduced.
  • Copper compounds containing Te and/or Se are an example of such useful compounds.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Claims (5)

  1. Pulvriger Zusatz zur Verbesserung der Bearbeitbarkeit und/oder des Verschleißwiderstandes für ein Eisen- oder Stahl-Pulver zur Verwendung in der pulvermetallurgischen Produktion von Preßlingen, dadurch gekennzeichnet, daß er aus MnS und wenigstens einer weiteren Verbindung besteht, die ausgewählt ist aus Te, einer Te-Verbindung, Se oder einer Se-Verbindung, wobei das Gewichtsverhältnis zwischen MnS und Te im Bereich 10-2000, vorzugsweise 50-1000, und das Gewichtsverhältnis zwischen MnS und Se im Bereich 10-1000, vorzugsweise 10-500, liegt.
  2. Pulvriger Zusatz nach Anspruch 1, dadurch gekennzeichnet, daß die Pulverteilchen aus einer chemischen Verbindung von MnS und Te oder einer Te-Verbindung und/oder Se oder einer Se-Verbindung bestehen.
  3. Pulvriger Zusatz nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß hauptsächlich alle Pulverteilchen aus einer innigen Mischung aus MnS und Te oder einer Te-Verbindung und/oder Se oder einer Se-Verbindung bestehen.
  4. Pulvriger Zusatz nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß er aus einer Mischung aus separaten Teilchen aus MnS und Te oder einer Te-Verbindung und/oder Se oder einer Se-Verbindung besteht.
  5. Eisen- oder Stahl-Pulver zur pulvermetallurgischen Herstellung von Preßlingen mit verbesserter Bearbeitbarkeit und/oder verbessertem Verschleißwiderstand, dadurch gekennzeichnet, daß es einen pulvrigen Zusatz aus MnS und wenigstens einer weiteren Verbindung enthält, die ausgewählt ist aus Te, einer Te-Verbindung, Se oder einer Se-Verbindung, wobei die Menge des MnS im Bereich zwischen 0,2 und 3 Gew.-% und das Gewichtsverhältnis zwischen MnS und Te im Bereich 10-2000, vorzugsweise 50-1000, und das Gewichtsverhältnis zwischen MnS und Se im Bereich 10-1000, vorzugsweise 10-500, liegt.
EP91906838A 1990-03-20 1991-03-18 Pulvriger zusatz zur verbesserung der bearbeitbarkeit und eisen- oder stahlpulver, die diesen pulvrigen zusatz enthalten Expired - Lifetime EP0521071B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9000979A SE468120B (sv) 1990-03-20 1990-03-20 Tillsatspulver foer foerbaettring av maskinbearbetbarhet och/ eller noetningsresistans, samt jaern- eller staalpulver innehaallande saadant tillsatspulver
SE9000979 1990-03-20
PCT/SE1991/000201 WO1991014526A1 (en) 1990-03-20 1991-03-18 Machinability improving supplementary powder and iron or steel powder containing such supplementary powder

Publications (2)

Publication Number Publication Date
EP0521071A1 EP0521071A1 (de) 1993-01-07
EP0521071B1 true EP0521071B1 (de) 1995-05-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91906838A Expired - Lifetime EP0521071B1 (de) 1990-03-20 1991-03-18 Pulvriger zusatz zur verbesserung der bearbeitbarkeit und eisen- oder stahlpulver, die diesen pulvrigen zusatz enthalten

Country Status (6)

Country Link
EP (1) EP0521071B1 (de)
JP (1) JPH05507118A (de)
AT (1) ATE122592T1 (de)
DE (1) DE69109863T2 (de)
SE (1) SE468120B (de)
WO (1) WO1991014526A1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE445715B (sv) * 1984-11-30 1986-07-14 Hoeganaes Ab Mangansulfidhaltig jernpulverblandning
AU3802489A (en) * 1988-07-13 1990-05-03 Kawasaki Steel Corporation Alloy steel powders for injection molding use, their compounds and a method for making sintered parts from the same

Also Published As

Publication number Publication date
SE9000979L (sv) 1991-09-21
ATE122592T1 (de) 1995-06-15
SE9000979D0 (sv) 1990-03-20
EP0521071A1 (de) 1993-01-07
DE69109863D1 (de) 1995-06-22
WO1991014526A1 (en) 1991-10-03
SE468120B (sv) 1992-11-09
JPH05507118A (ja) 1993-10-14
DE69109863T2 (de) 1995-09-21

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