WO2001055481A1 - Alimentation electrique pour traitement de surface par decharge et procede de traitement de surface par decharge - Google Patents

Alimentation electrique pour traitement de surface par decharge et procede de traitement de surface par decharge Download PDF

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Publication number
WO2001055481A1
WO2001055481A1 PCT/JP2000/000303 JP0000303W WO0155481A1 WO 2001055481 A1 WO2001055481 A1 WO 2001055481A1 JP 0000303 W JP0000303 W JP 0000303W WO 0155481 A1 WO0155481 A1 WO 0155481A1
Authority
WO
WIPO (PCT)
Prior art keywords
surface treatment
discharge
pulse width
workpiece
discharge surface
Prior art date
Application number
PCT/JP2000/000303
Other languages
English (en)
Japanese (ja)
Inventor
Akihiro Goto
Toshio Moro
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to CN00805400.2A priority Critical patent/CN1210128C/zh
Priority to PCT/JP2000/000303 priority patent/WO2001055481A1/fr
Priority to DE10084316T priority patent/DE10084316B4/de
Priority to CH01772/01A priority patent/CH695567A5/de
Priority to TW089101612A priority patent/TW483948B/zh
Publication of WO2001055481A1 publication Critical patent/WO2001055481A1/fr

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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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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

Definitions

  • a discharge is generated between an electrode for discharge surface treatment and a workpiece, and a hard coating made of the electrode material or a substance in which the electrode material reacts with the discharge energy by the energy of the discharge.
  • TECHNICAL FIELD The present invention relates to a power supply device for electric discharge surface treatment and an electric discharge surface treatment method used for electric discharge surface treatment for forming a hard coating made of the following. Background art
  • techniques for forming a hard coating on the surface of a workpiece to impart corrosion resistance and wear resistance include, for example, a discharge surface disclosed in Japanese Patent Application Laid-Open No. 5-148615.
  • a processing method In this technology, primary processing (deposition processing) is performed using a green compact electrode, which is a discharge surface treatment electrode formed by mixing WC (tandustane carbide) powder and Co (cobalt) powder and compression molding.
  • This is a method for treating the discharge surface of a metal material, which consists of two steps: performing a secondary process (remelting process) by replacing the electrode with a relatively low electrode consumption such as a copper electrode.
  • This method can form a hard coating with strong adhesion to steel, but cannot form a hard coating with strong adhesion to sintered materials such as cemented carbide. Have difficulty.
  • the green compact electrode is an electrode for electrical-discharge surface treatment with a mixture of other metals or ceramics hydride such as T i H 2, when a discharge is generated between the metal material as a workpiece, the hardness It is important that hard coatings having various properties such as abrasion resistance can be quickly formed.
  • FIG. 4 is a block diagram showing an example of an apparatus used for such a discharge surface treatment.
  • 1 is a green compact electrode which is an electrode for discharge surface treatment formed by compression molding of TiH2 powder
  • 2 is a workpiece
  • 3 is a heating tank
  • 4 is a working fluid
  • 5 is a green compact.
  • Such a conventional discharge surface treatment power supply device is basically based on a rectangular discharge current pulse, and as shown in FIG. 5, by changing the discharge current peak value I p and the pulse width T, Hard coating formed on workpiece Is to adjust the film thickness or the like.
  • FIG. 6 is an explanatory diagram of the adhesion of the electrode material to the workpiece
  • FIG. 7 is a diagram showing changes in the current density and the diameter of the discharge arc column with the passage of time from the start of discharge.
  • 1 is an electrode for electrical discharge surface treatment
  • 2 is a workpiece
  • 10 is a discharge arc column
  • 11 is an electrode component that is rapidly heated, vaporized, exploded and released
  • 12 is a workpiece 2 This is the electrode component attached.
  • the diameter of the discharge arc column 10 is small and the current density is extremely high, as shown in (a) of FIG. 6 and FIG.
  • the electrode for electric discharge surface treatment is different from the normal electrode for electric discharge machining that performs removal machining, in which the heat conduction and the mechanical strength are deliberately reduced to improve the productivity of the surface treatment work ;
  • the portion near the discharge arc column 10 of the discharge surface treatment electrode 1 is rapidly heated, and a part of the discharge surface treatment electrode 1 is vaporized and exploded. It will be scattered around (in the machining fluid).
  • the rapidly heated, vaporized, exploded, and released electrode component 11 is rapidly cooled by the heating solution, and does not become a hard coating of the workpiece 2.
  • the current density is appropriate, as shown in FIG. 6 (b), since the diameter of the discharge arc column 10 is widened, a wide area of the discharge surface treatment electrode 1 is heated and covered. The amount of the electrode component 12 attached to the workpiece 2 increases.
  • the ratio of the electrode material adhering to the workpiece is small. Therefore, the ratio of the electrode material adhering to the workpiece is about 10% to 50% by weight, and there is a problem that the surface treatment cost is increased due to the large waste of the electrode material.
  • the electrode material is released by the heat of the discharge, and a part of the material is melted and adhered to the surface of the workpiece as a hard film.
  • the discharge energy has a function of releasing the electrode material and a function of melting the released material and the workpiece.
  • Fig. 8 is a photograph of the surface of the workpiece when the discharge surface treatment was performed by a single discharge current pulse on the steel material as the workpiece.
  • Fig. 8 (a) shows the amount of release of the electrode material. If too much, FIG. 8 (b) shows the case where the amount of the released electrode material is too small. If the release amount of the electrode material is too large ((a) in Fig.
  • the electrode material released by the discharger energy will not melt sufficiently, and a dense hard film cannot be formed on the workpiece. . If the amount of electrode material released is too small (FIG. 8 (b)), the workpiece is excessively melted, and the workpiece is removed more than the hard coating adheres.
  • the rectangular discharge current pulse waveform shows that in one discharge, the discharge of the electrode material and the discharge of the electrode material and the workpiece by one rectangular discharge current pulse. It is difficult to secure an appropriate supply amount of electrode material because of simultaneous melting of the electrodes, and it is difficult to remove the workpiece due to insufficient supply of electrode material and to melt the hard coating due to excessive supply of electrode material. There is a problem that occurs. Disclosure of the invention
  • the present invention has been made in order to solve the above-described problems, and can reduce surface treatment costs and form a dense hard film on a workpiece.
  • An object is to obtain a power supply device and a discharge surface treatment method.
  • the power supply device for electric discharge surface treatment is used for electric discharge surface treatment in which a discharge is generated between an electrode for electric discharge surface treatment and a workpiece and energy is used to form a hard coating on the surface of the workpiece.
  • the discharge current pulse is set to a first pulse width T 1 (first peak value I p 1), second pulse width T 2 (second peak value I p 2), ..., n-th pulse width Tn (peak value of ⁇ ⁇ ⁇ ⁇ ) ( ⁇ is an integer of 2 or more ),
  • the first pulse width ⁇ 1 and the first peak value I ⁇ 1 are set so as to be a current density between the electrodes within a predetermined range for suppressing emission of the electrode material.
  • the k-th pulse width T k and the k-th peak value I pk (2 ⁇ k ⁇ n, where k is an integer) are set in advance according to the desired processing conditions when the supply amount of the hard coating material due to the release of the electrode material is set. Control means for
  • the discharge surface treatment method according to the present invention is directed to a discharge surface treatment method for generating a discharge between a discharge surface treatment electrode and a workpiece, and forming a hard coating on the surface of the workpiece by energy thereof.
  • Discharge current pulse for generating a discharge between a discharge surface treatment electrode and a workpiece, and forming a hard coating on the surface of the workpiece by energy thereof.
  • first pulse width T 1 (first peak value I pi), second pulse width T 2 (second peak value I p 2), nth pulse width Tn (nth peak value I pn) (n is an integer of 2 or more), and the first pulse width T 1 and the first peak value I p 1 are defined as the distance between the electrodes within a predetermined range for suppressing the release of the electrode material.
  • the current density is set so that the k-th pulse width T k and the k-th peak value I pk (2 ⁇ k ⁇ n, k is an integer) are set so that the supply amount of the hard coating material by the release of the electrode material is A hard coating is formed on the surface of the workpiece by setting the value to a value set in advance in accordance with an intended processing condition.
  • the present invention is configured as described above, and has the following effects.
  • the power supply device for discharge surface treatment and the discharge surface treatment method according to the present invention can efficiently make the electrode material adhere to the workpiece surface, the surface treatment cost can be reduced.
  • FIG. 1 is a diagram showing a configuration of a power supply device for surface treatment for discharge according to an embodiment of the present invention, a voltage between electrodes, and a discharge current.
  • FIG. 2 is an explanatory diagram showing a state of forming a hard film on a workpiece by discharge surface treatment using the power supply device for discharge surface treatment according to the embodiment of the present invention.
  • FIG. 3 shows the electrode wear lengths when the discharge surface treatment was performed using the conventional power supply device for discharge surface treatment and when the discharge surface treatment was performed using the power supply device for discharge surface treatment according to the present invention. It is a figure which shows comparison of a height.
  • FIG. 4 is a configuration diagram showing an example of an apparatus used for discharge surface treatment.
  • FIG. 5 is a diagram showing a gap voltage and a discharge current pulse in a conventional power supply device for surface treatment for discharge.
  • FIG. 6 is an explanatory diagram of the adhesion of the electrode material to the workpiece.
  • FIG. 7 is a diagram showing changes in current density and diameter of a discharge arc column with the passage of time from the start of discharge.
  • FIG. 8 is a photograph of the surface of the workpiece when the discharge surface treatment was performed on the steel material by one discharge current pulse.
  • FIG. 1 shows a power supply device for electric discharge surface treatment according to an embodiment of the present invention.
  • FIG. 1 (a) is a configuration diagram
  • FIG. (B) shows the gap voltage and discharge current
  • (c) in FIG. 1 shows another example of the discharge current.
  • 1 is an electrode for electric discharge surface treatment
  • 2 is a workpiece
  • 3 is a machining tank
  • 4 is a machining fluid
  • 13 is a switching element group
  • 14 is an on / off of the switching element group 13.
  • Control means to control 15 is power supply, 16 is resistor group, T 1 is the first pulse width, T 2 is the second pulse width, Tr is the dwell time, I pl is the first peak value, and I p 2 is the second peak value.
  • the switching element group 13, the control means 14, the power supply 15, and the resistor group 16 correspond to a discharge surface treatment power supply device that determines a discharge current pulse waveform and the like in the discharge surface treatment.
  • the discharge surface treatment electrode 1 and the workpiece 2 are opposed to each other in the machining fluid 4, and a predetermined gap is maintained by a driving device (not shown).
  • the peak value of the discharge current is a function of the power supply voltage of the power supply 15 and the resistance value of the resistor group 16 connected in series with the on switching element of the switching element group 13.
  • the discharge surface treatment electrode 1 and the workpiece 2 are connected to each other. After a predetermined time has elapsed, discharge occurs (first peak value I p 1).
  • the switching element that has been turned on is turned off by the control means 14, and a resistor having a small resistance value in the resistor group 16 is turned off.
  • the discharge current is increased by turning on the switching elements of the switching element group 13 connected in series (second peak value Ip2).
  • the control means 14 turns off all the switching elements of the switching element group 13.
  • the switching elements of the switching element group 13 are selectively turned on again by the control means 14.
  • the discharge surface treatment is performed by repeating the above operations. As described above, the control of the peak value of the discharge current can be performed by the control means 14 selectively turning on and off the switching elements of the switching element group 13.
  • the discharge current pulse may be stepwise as shown in FIG. 1 (b),
  • the shape may be a slope as shown in (c) of FIG.
  • the discharge current and the slope can be increased by a method such as introducing an inductance in series with the power supply circuit of the power supply device for discharge surface treatment.
  • FIG. 2 is an explanatory view showing a state in which a hard film is formed on a workpiece by discharge surface treatment using a power supply device for discharge surface treatment according to an embodiment of the present invention.
  • 2 is a workpiece
  • 10 is a discharge arc column
  • 17 is a hard coating formed on the workpiece 2 by the method according to the present invention.
  • (A) in FIG. 2 corresponds to the first part of the first pulse width T1 in (b) or (c) in FIG. 1
  • (b) in FIG. 2 corresponds to ( b) or (c) corresponds to the last part of the first pulse width T1
  • (c) in FIG. 2 corresponds to the second pulse width T2 in (b) or (c) in FIG. It corresponds to the part.
  • the first pulse width T 1 and the first peak value I p 1 are set so as to have a current density within a predetermined range for suppressing the release of the electrode material.
  • (A) in FIG. 2) In the section of the first pulse width T1, the diameter of the discharge arc column 10 is made sufficiently large ((b) in FIG. 2).
  • the supply amount of the hard coating material due to the discharge of the electrode material is previously determined at the second pulse width T2 according to the intended processing conditions.
  • the switching means 13 and the like are controlled by the control means 14 so that the set value is obtained, and the discharge current is increased to a predetermined second peak value Ip2.
  • the hard film 17 is formed efficiently (FIG. 2 (c)).
  • the first pulse width T1 and the first peak value Ip1, which are the current density between the electrodes within a predetermined range that suppresses the release of the electrode material, and the supply amount of the hard coating material to the workpiece are determined.
  • the set values of the second pulse width T2 and the second peak value Ip2, which are the desired amount, are determined in advance by experiments, and the required processing speed, surface properties of the hard coating, electrode consumption, etc. It can be set according to the processing conditions. Wear.
  • the pulse width of the discharge current and the parameters of the peak value of T 2 are changed
  • work Data such as the surface properties of the hard coating formed on the object and the productivity of the surface treatment work are collected in advance by experiments, and using these data, the expected processing speed, the surface properties of the hard coating, and electrode consumption
  • FIG. 3 shows the electrode wear lengths when the discharge surface treatment was performed using the conventional power supply device for discharge surface treatment and when the discharge surface treatment was performed using the power supply device for discharge surface treatment according to the present invention.
  • the comparison was made under the condition that the thickness of the hard coating formed on the workpiece was the same.
  • the discharge current pulse from the conventional discharge surface treatment power supply device is a rectangular wave having a peak value IP of 8 A and a pulse width T of 8 s.
  • the discharge current pulse from the discharge surface treatment power supply device according to the present invention is as follows.
  • the first pulse width T1 is 8 s
  • the first peak value Ip1 is 2 A
  • the second pulse width T2 is 8 s
  • the second peak value Ip2 is 8 A.
  • the electrode wear length is about 500 m for the conventional discharge current pulse and about 200 m for the discharge current pulse according to the present invention. It can be seen that electrode wear can be greatly reduced.
  • the electrode material can be efficiently attached to the surface of the workpiece, thereby reducing the surface treatment cost. Can be. Also, electrode materials Since a proper supply amount of the material can be secured, a dense hard film can be formed on the workpiece.
  • the peak value of the discharge current may be three steps or more in two steps. Further, in each section of the pulse width, the current value of the discharge current pulse is not constant or slope-shaped, and may be a predetermined time function.
  • the power supply device for discharge surface treatment and the discharge surface treatment method according to the present invention are suitable for use in a surface treatment-related industry in which a hard film is formed on the surface of a workpiece.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Selon cette invention, on détermine une première largeur T1 d'impulsion et une première valeur Ipl de crête de sorte que la densité de courant ente une électrode (1) et une pièce (2) soit comprise dans une plage prédéfinie et que le dégagement du matériau de l'électrode soit contrôlé. Durant la première largeur T1 d'impulsion, une fois que le diamètre de la colonne (10) d'arc de décharge a atteint une valeur suffisante, le courant de décharge augmente d'une seconde valeur Ip2 de crête de façon à obtenir une quantité prédéterminée de matériau de revêtement dur lors du dégagement du matériau de l'électrode en fonction de conditions de traitement prédéfinies durant une seconde largeur T2 d'impulsion. On génère ensuite une décharge entre les électrodes de façon à former efficacement un revêtement dur (17) sur la pièce (2). Selon ce procédé, on parvient à réduire le coût du traitement de surface et à former sur une pièce (2) un revêtement (17) dur et dense.
PCT/JP2000/000303 2000-01-24 2000-01-24 Alimentation electrique pour traitement de surface par decharge et procede de traitement de surface par decharge WO2001055481A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN00805400.2A CN1210128C (zh) 2000-01-24 2000-01-24 放电表面处理用电源装置和放电表面处理方法
PCT/JP2000/000303 WO2001055481A1 (fr) 2000-01-24 2000-01-24 Alimentation electrique pour traitement de surface par decharge et procede de traitement de surface par decharge
DE10084316T DE10084316B4 (de) 2000-01-24 2000-01-24 Verfahren der Elektroentladungsoberflächenbehandlung
CH01772/01A CH695567A5 (de) 2000-01-24 2000-01-24 Elektrisches Netzgerät zur elektrischen Oberflächenentladungsbearbeitung (Funkenerosionsbwarbeitung) und ein Verfahren zur elektrischen Oberflächenentladungsbearbeitung.
TW089101612A TW483948B (en) 2000-01-24 2000-01-31 Power supply device for discharge surface treating and a surface treating method with electric discharge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2000/000303 WO2001055481A1 (fr) 2000-01-24 2000-01-24 Alimentation electrique pour traitement de surface par decharge et procede de traitement de surface par decharge

Publications (1)

Publication Number Publication Date
WO2001055481A1 true WO2001055481A1 (fr) 2001-08-02

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PCT/JP2000/000303 WO2001055481A1 (fr) 2000-01-24 2000-01-24 Alimentation electrique pour traitement de surface par decharge et procede de traitement de surface par decharge

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CN (1) CN1210128C (fr)
CH (1) CH695567A5 (fr)
DE (1) DE10084316B4 (fr)
TW (1) TW483948B (fr)
WO (1) WO2001055481A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004108990A1 (fr) * 2003-06-05 2004-12-16 Mitsubishi Denki Kabushiki Kaisha Electrode de traitement de surface de decharge, methode de production et methode d'evaluation pour une electrode de traitement de surface de decharge, dispositif de traitement de surface de decharge et methode de traitement de surface de decharge
WO2005068845A1 (fr) * 2004-01-14 2005-07-28 Ishikawajima-Harima Heavy Industries Co., Ltd. Compresseur, ailette de rotor fabriquee en titane, procede de fabrication de moteur a reaction et d'ailette de rotor en titane
JP2005213554A (ja) * 2004-01-29 2005-08-11 Mitsubishi Electric Corp 放電表面処理方法および放電表面処理装置。
JP2011102562A (ja) * 2009-11-11 2011-05-26 Mitsubishi Electric Corp 機械部品の補修方法
US9359682B2 (en) 2009-07-28 2016-06-07 Mitsubishi Electric Corporation Erosion resistant machine component, method for forming surface layer of machine component, and method for manufacturing steam turbine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0770761A (ja) * 1993-08-31 1995-03-14 Res Dev Corp Of Japan アルミニウム及びその合金の液中放電による表面処理方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0770761A (ja) * 1993-08-31 1995-03-14 Res Dev Corp Of Japan アルミニウム及びその合金の液中放電による表面処理方法

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004108990A1 (fr) * 2003-06-05 2004-12-16 Mitsubishi Denki Kabushiki Kaisha Electrode de traitement de surface de decharge, methode de production et methode d'evaluation pour une electrode de traitement de surface de decharge, dispositif de traitement de surface de decharge et methode de traitement de surface de decharge
JPWO2004108990A1 (ja) * 2003-06-05 2006-07-20 三菱電機株式会社 放電表面処理用電極、放電表面処理用電極の製造方法と評価方法、放電表面処理装置および放電表面処理方法
JP4563318B2 (ja) * 2003-06-05 2010-10-13 三菱電機株式会社 放電表面処理用電極、放電表面処理装置および放電表面処理方法
US7910176B2 (en) 2003-06-05 2011-03-22 Mitsubishi Denki Kabushiki Kaisha Electrode for discharge surface treatment, manufacturing method and evaluation method for electrode for discharge surface treatment, discharge surface treatment apparatus, and discharge surface treatment method
WO2005068845A1 (fr) * 2004-01-14 2005-07-28 Ishikawajima-Harima Heavy Industries Co., Ltd. Compresseur, ailette de rotor fabriquee en titane, procede de fabrication de moteur a reaction et d'ailette de rotor en titane
US7824159B2 (en) 2004-01-14 2010-11-02 Ishikawajima-Harima Heavy Industries Co., Ltd. Compressor, titanium-made rotor blade, jet engine and titanium-made rotor blade producing method
JP2005213554A (ja) * 2004-01-29 2005-08-11 Mitsubishi Electric Corp 放電表面処理方法および放電表面処理装置。
US9359682B2 (en) 2009-07-28 2016-06-07 Mitsubishi Electric Corporation Erosion resistant machine component, method for forming surface layer of machine component, and method for manufacturing steam turbine
JP2011102562A (ja) * 2009-11-11 2011-05-26 Mitsubishi Electric Corp 機械部品の補修方法

Also Published As

Publication number Publication date
TW483948B (en) 2002-04-21
CN1344333A (zh) 2002-04-10
DE10084316T1 (de) 2002-04-11
CH695567A5 (de) 2006-06-30
DE10084316B4 (de) 2005-12-22
CN1210128C (zh) 2005-07-13

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