ATE134222T1 - METHOD FOR HARDENING WORKPIECES IN A PULSE PLASMA DISCHARGE - Google Patents

METHOD FOR HARDENING WORKPIECES IN A PULSE PLASMA DISCHARGE

Info

Publication number
ATE134222T1
ATE134222T1 AT92121129T AT92121129T ATE134222T1 AT E134222 T1 ATE134222 T1 AT E134222T1 AT 92121129 T AT92121129 T AT 92121129T AT 92121129 T AT92121129 T AT 92121129T AT E134222 T1 ATE134222 T1 AT E134222T1
Authority
AT
Austria
Prior art keywords
plasma discharge
duration
carbon
carburisation
vacuo
Prior art date
Application number
AT92121129T
Other languages
German (de)
Inventor
Albrecht Dr Melber
Frank Dipl-Ing Schnatbaum
Rie Prof Dr-Ing Kyong-Tschong
Original Assignee
Leybold Durferrit 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 Leybold Durferrit Gmbh filed Critical Leybold Durferrit Gmbh
Application granted granted Critical
Publication of ATE134222T1 publication Critical patent/ATE134222T1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
    • C23C8/38—Treatment of ferrous surfaces

Abstract

Workpieces made of steel are hardened by carburising the surface and subsequent quenching. Carburisation is carried out by means of a plasma discharge in vacuo in the presence of gaseous hydrocarbons at voltages between 200 and 2000 volts, preferably between 300 and 1000 volts, and preferably with the admixture of argon. The plasma is generated by electrodes operated in vacuo, of which the cathode serves as the workpiece holder and is operated in a pulsed manner. So as to achieve, in the process, a uniform hardness distribution even for irregularly shaped workpieces and to reduce the carbon mass flow, a) carburisation is carried out at an overall pressure between 14 and 30 mbar (1400 to 3000 Pa), b) a pulse duration of between 110 and 10,000 mu s (microseconds) is chosen, c) an internal duration of between 30 and 10,000 mu s is chosen and d) the mean power supplied to the plasma discharge is decreased, after completion of the start-up phase, by reducing the pulse duration and/or extending the interval duration, either continuously or in a stepwise manner, in such a way that the carbon content at said surface, without interruption of the pulsed operation, does not exceed at any time the saturation limit of the material for carbon in the austenitic domain. o
AT92121129T 1992-01-20 1992-12-11 METHOD FOR HARDENING WORKPIECES IN A PULSE PLASMA DISCHARGE ATE134222T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4201325 1992-01-20
DE4238993A DE4238993C1 (en) 1992-01-20 1992-11-19

Publications (1)

Publication Number Publication Date
ATE134222T1 true ATE134222T1 (en) 1996-02-15

Family

ID=25911085

Family Applications (1)

Application Number Title Priority Date Filing Date
AT92121129T ATE134222T1 (en) 1992-01-20 1992-12-11 METHOD FOR HARDENING WORKPIECES IN A PULSE PLASMA DISCHARGE

Country Status (5)

Country Link
EP (1) EP0552460B1 (en)
JP (1) JPH0657404A (en)
AT (1) ATE134222T1 (en)
DE (2) DE4238993C1 (en)
ES (1) ES2083663T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05128675A (en) * 1991-11-05 1993-05-25 Sony Corp Automatic cassette changer
US5868878A (en) * 1993-08-27 1999-02-09 Hughes Electronics Corporation Heat treatment by plasma electron heating and solid/gas jet cooling
WO1995029274A1 (en) * 1994-04-26 1995-11-02 Igenwert Gmbh Process for incorporating material into the surface of a solid body and altering it, in particular the surface of a material
DE4427902C1 (en) * 1994-08-06 1995-03-30 Leybold Durferrit Gmbh Method for carburising components made from carburisable materials by means of a plasma discharge operated in a pulsed fashion
DE102004053935B4 (en) * 2004-11-09 2015-04-09 Schaeffler Technologies AG & Co. KG Process for the heat treatment of a component made of a thermosetting heat-resistant steel and a component made of a thermosetting, heat-resistant steel
DE102006040814A1 (en) * 2006-08-31 2008-03-06 Schaeffler Kg Method for producing a highly hardenable rolling bearing component

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE601847C (en) * 1933-04-01 1934-08-25 Siemens Schuckertwerke Akt Ges Method for introducing a substance into a metal
NL91406C (en) * 1950-08-03
FR2501727A1 (en) * 1981-03-13 1982-09-17 Vide Traitement PROCESS FOR THE THERMOCHEMICAL TREATMENT OF METALS BY ION BOMBING
GB8625912D0 (en) * 1986-10-29 1986-12-03 Electricity Council Thermochemical treatment
DE3714283C1 (en) * 1987-04-29 1988-11-24 Ipsen Ind Internat Gmbh Process for gas carburizing steel
US4853046A (en) * 1987-09-04 1989-08-01 Surface Combustion, Inc. Ion carburizing

Also Published As

Publication number Publication date
ES2083663T3 (en) 1996-04-16
JPH0657404A (en) 1994-03-01
DE4238993C1 (en) 1993-07-01
DE59205356D1 (en) 1996-03-28
EP0552460B1 (en) 1996-02-14
EP0552460A1 (en) 1993-07-28

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Legal Events

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EEIH Change in the person of patent owner
EEIH Change in the person of patent owner
REN Ceased due to non-payment of the annual fee