EP0366900A1 - Gesinterte, metallgebundene Carbide - Google Patents

Gesinterte, metallgebundene Carbide Download PDF

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Publication number
EP0366900A1
EP0366900A1 EP89116290A EP89116290A EP0366900A1 EP 0366900 A1 EP0366900 A1 EP 0366900A1 EP 89116290 A EP89116290 A EP 89116290A EP 89116290 A EP89116290 A EP 89116290A EP 0366900 A1 EP0366900 A1 EP 0366900A1
Authority
EP
European Patent Office
Prior art keywords
carbide
phase
mixed oxide
powder
carburization
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.)
Withdrawn
Application number
EP89116290A
Other languages
German (de)
English (en)
French (fr)
Inventor
Reinhard Dr. Dipl.-Chem. Marquardt
Rainer Dr. Dipl.-Phys. Schmidberger
Wolfgang Siebke
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.)
Dornier GmbH
Original Assignee
Dornier GmbH
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 Dornier GmbH filed Critical Dornier GmbH
Publication of EP0366900A1 publication Critical patent/EP0366900A1/de
Withdrawn legal-status Critical Current

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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
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • 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
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
    • B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
    • 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
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%

Definitions

  • the invention relates to carbide materials as the starting material for highly wear-resistant tools, for example high-speed steels, and machine parts.
  • the material according to the invention has the advantage of very good mechanical properties because of the small carbide grains with a narrow size range and because of its high density.
  • the second step, the reduction / carburization of the mixed oxides, is carried out with carburizing gases or gas mixtures or carbon. They are particularly good for this Rotary tube ovens or fluidized bed reactors that prevent caking. This step can also be carried out in a bed.
  • the third step (pressing and sintering) is carried out using methods known per se, although considerably larger temperature intervals are permitted during sintering than with the powders known hitherto.
  • the carbide size in the powder agglomerates is determined both by the manufacturing process of the mixed oxide powders and by grain growth during carburizing.
  • the crystallite size of the mixed oxide powder increases with increasing temperature in the RSV. This crystallite size significantly influences the carbide grain size after carburization.
  • the carburization itself takes place at such low temperatures that there is no grain growth.
  • Carburizing gases, gas mixtures or carbon are used as reducing and carburizing agents. CH4 / H2 mixtures with a carbon activity ⁇ 1 are suitable. Carbon acts both as a direct reducing / carburizing agent and indirectly through the formation of CO with the mixed oxide.
  • the reaction is carried out in a time-controlled manner leads, that is, the carbon content is adjusted over the carburizing time.
  • the relationship between carburizing time and carbon content must be determined empirically for the respective carburizing type.
  • a solution with a metal concentration of 150 g / l is prepared from stoichiometrically equivalent amounts of chromium nitrate, cobalt nitrate, iron nitrate, vanadyl sulfate, ammonium metatungstate and ammonium heptamolybdate with the addition of water.
  • the solution thus prepared is sprayed into a hot reactor at 10 l / h (reaction temperature 800 ° C.).
  • the aerosol evaporates extremely quickly, the salts decompose, producing very fine-crystalline, homogeneous mixed oxide particles (FIG. 1). Gases and particles are separated in a separator, the powder is subjected to a reduction / carburization.
  • the reduction / carburization takes place, for example, in one Fluid bed system, in which caking of the powder during the implementation can be excluded.
  • the reaction is carried out at 950 ° C, the reaction gas is a mixture of 99% H2 and 1% CH4.
  • FIG. 4 shows the structure of a sintered part in a magnification of 2500 times.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP89116290A 1988-09-05 1989-09-04 Gesinterte, metallgebundene Carbide Withdrawn EP0366900A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3830112 1988-09-05
DE19883830112 DE3830112A1 (de) 1988-09-05 1988-09-05 Verfahren zur herstellung gesinterter, metallgebundener carbide fuer schnellarbeitsstaehle

Publications (1)

Publication Number Publication Date
EP0366900A1 true EP0366900A1 (de) 1990-05-09

Family

ID=6362309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116290A Withdrawn EP0366900A1 (de) 1988-09-05 1989-09-04 Gesinterte, metallgebundene Carbide

Country Status (2)

Country Link
EP (1) EP0366900A1 (enrdf_load_stackoverflow)
DE (1) DE3830112A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5835842A (en) * 1993-05-20 1998-11-10 Toshiba Kikai Kabushiki Kaisha Alloy having excellent corrosion resistance and abrasion resistance, method for producing the same and material for use in production of the same
CN113260473A (zh) * 2019-01-18 2021-08-13 Vbn组件有限公司 3d打印的高碳含量钢及其制备方法
US11123801B2 (en) * 2015-05-13 2021-09-21 Kennametal Inc. Cutting tool made by additive manufacturing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256106A1 (enrdf_load_stackoverflow) * 1973-12-28 1975-07-25 Union Carbide Corp
US3901689A (en) * 1973-08-15 1975-08-26 Union Carbide Corp Method for producing chromium-chromium carbide powder
US4032302A (en) * 1974-12-23 1977-06-28 Hitachi Metals, Ltd. Carbide enriched high speed tool steel
EP0076326A1 (en) * 1981-04-08 1983-04-13 The Furukawa Electric Co., Ltd. Sintered, high-v, high-speed steel and process for its production
US4487627A (en) * 1982-11-01 1984-12-11 Fuji Photo Film Co., Ltd. Method for preparing ferromagnetic metal particles
EP0234099A2 (en) * 1986-02-25 1987-09-02 Crucible Materials Corporation Powder metallurgy high speed tool steel article and method of manufacture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901689A (en) * 1973-08-15 1975-08-26 Union Carbide Corp Method for producing chromium-chromium carbide powder
FR2256106A1 (enrdf_load_stackoverflow) * 1973-12-28 1975-07-25 Union Carbide Corp
US4032302A (en) * 1974-12-23 1977-06-28 Hitachi Metals, Ltd. Carbide enriched high speed tool steel
EP0076326A1 (en) * 1981-04-08 1983-04-13 The Furukawa Electric Co., Ltd. Sintered, high-v, high-speed steel and process for its production
US4487627A (en) * 1982-11-01 1984-12-11 Fuji Photo Film Co., Ltd. Method for preparing ferromagnetic metal particles
EP0234099A2 (en) * 1986-02-25 1987-09-02 Crucible Materials Corporation Powder metallurgy high speed tool steel article and method of manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5835842A (en) * 1993-05-20 1998-11-10 Toshiba Kikai Kabushiki Kaisha Alloy having excellent corrosion resistance and abrasion resistance, method for producing the same and material for use in production of the same
US11123801B2 (en) * 2015-05-13 2021-09-21 Kennametal Inc. Cutting tool made by additive manufacturing
CN113260473A (zh) * 2019-01-18 2021-08-13 Vbn组件有限公司 3d打印的高碳含量钢及其制备方法
CN113260473B (zh) * 2019-01-18 2023-09-19 Vbn组件有限公司 3d打印的高碳含量钢及其制备方法

Also Published As

Publication number Publication date
DE3830112C2 (enrdf_load_stackoverflow) 1990-06-07
DE3830112A1 (de) 1990-03-15

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