EP0374585B1 - Verfahren zur Herstellung einer Oberflächenschicht aus Molybdän durch thermisches Spritzen - Google Patents

Verfahren zur Herstellung einer Oberflächenschicht aus Molybdän durch thermisches Spritzen Download PDF

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Publication number
EP0374585B1
EP0374585B1 EP89122474A EP89122474A EP0374585B1 EP 0374585 B1 EP0374585 B1 EP 0374585B1 EP 89122474 A EP89122474 A EP 89122474A EP 89122474 A EP89122474 A EP 89122474A EP 0374585 B1 EP0374585 B1 EP 0374585B1
Authority
EP
European Patent Office
Prior art keywords
molybdenum
spraying
spray
flame
coating
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
EP89122474A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0374585A1 (de
Inventor
Heinrich Prof.-Dr. Kreye
Peter Dipl.-Ing. Heinrich
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Priority to AT89122474T priority Critical patent/ATE96849T1/de
Publication of EP0374585A1 publication Critical patent/EP0374585A1/de
Application granted granted Critical
Publication of EP0374585B1 publication Critical patent/EP0374585B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements

Definitions

  • the invention relates to a method for producing a surface layer from molybdenum by thermal spraying.
  • Molybdenum is known as an extremely wear-resistant material, and it is therefore the goal of many metal products to provide them with a high-quality molybdenum surface layer. Thermal spraying methods are also used for this purpose. The difficulties with the thermal spraying of molybdenum layers are due in particular to the fact that molybdenum has a very high melting point (2610 ° C.).
  • the high melting temperature of the molybdenum results in the need for a certain minimum residence time of the spray particles in the melting zone, i.e. must be present in the plasma jet. As a consequence, the conveying speed of the molybdenum powder particles is limited. This leads to restrictions in the process design and quality restrictions in the layer to be applied. In addition, due to the lack of oxygen in the melting zone, there is no quality-enhancing oxidation of the spray particles during the melting process. This also leads to a deterioration in the coating quality.
  • the material molybdenum used in the present invention it is also known that it can be produced in oxidized or partially oxidized form, these states having a lower melting point than the pure form (up to below 1000 ° C.) (see, for example, subject of the invention U.S. Patent 4,146,388).
  • the object of the present invention is now to provide a thermal spraying process for producing molybdenum layers which overcomes the disadvantages of the known processes and in particular allows greater flexibility in the process parameters compared to the known processes, which consequently leads to better molybdenum layer quality .
  • the autogenous spray process can oxidize the spray material, which leads to greater hardness of the spray layer produced. A reducing effect can also be set.
  • the pre-oxidized spray material often proves to be an advantage.
  • the powdery nature of the spray material allows different grain sizes to be used.
  • a process design that leads to particularly high quality results is that the process pressures are chosen such that melt particle speeds greater than 250 m / sec., Preferably more than 300 m / sec., Result.
  • the drawing shows a cross section through a flame spray burner head without showing the fuel gas supply and spray material supply in detail.
  • the burner head has a centrally arranged combustion chamber 21, into the feed channels 22 for the combustion gas mixture, for. B. consisting of fuel gas and oxygen, with a somewhat conical orientation, so that the incoming, burning gas jets intersect in the combustion chamber 21 and form a flame 24.
  • the carrier gas jet is guided into this flame through a central channel 23.
  • the carrier gas jet contains the pre-oxidized molybdenum spray material.
  • the spray material is melted in the flame 24 generated by the fuel gas and oxygen and the entire mixture of combustion gases, carrier gas and melted spray material is passed on through a main channel 25 adjoining the combustion chamber 21 and finally leaves the burner head in the form of a spray jet 27.
  • An outer casing 28 of the burner head and the main duct wall and the duct 29 formed in the combustion chamber wall cools the burner head.
  • This burner head is now operated according to the invention as follows: Powdery, completely pre-oxidized molybdenum is introduced into the combustion chamber 21 in a nitrogen stream through the central channel 23.
  • the pressure of the nitrogen carrier gas is approximately 5 bar.
  • the combustion chamber is supplied with hydrogen and oxygen in a somewhat sub-stoichiometric composition via the supply channels 22. This takes place at a pressure of approximately 4.5 bar.
  • These process parameters produce a high spray particle speed, generally more than 300 m / sec. And, on the other hand, a sufficient melting of the spray material is achieved (grain size of the spray material is approximately 50 to 100 micrometers).
  • the pre-oxidized, powdery molybdenum is at the same time partially reduced and melted when passing through the flame 24 and in this form strikes the workpiece surface to be coated.
  • the result is a surface layer with particularly high hardness and adhesive tensile strength with low porosity.
  • the flame spraying process according to the invention can also be carried out with other fuel gases, such as propane, propylene, acetylene, etc.
  • the autogenous thermal spraying process according to the invention in contrast to plasma spraying, implies the advantages of an autogenous flame, while at the same time achieving a high degree of flexibility in the process parameters.
  • the advantages of using higher process pressures in high-speed flame spraying, such as advantageously oxidized spray particles at high speed, should be emphasized.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Chemically Coating (AREA)
EP89122474A 1988-12-15 1989-12-06 Verfahren zur Herstellung einer Oberflächenschicht aus Molybdän durch thermisches Spritzen Expired - Lifetime EP0374585B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89122474T ATE96849T1 (de) 1988-12-15 1989-12-06 Verfahren zur herstellung einer oberflaechenschicht aus molybdaen durch thermisches spritzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3842263 1988-12-15
DE3842263A DE3842263C1 (enrdf_load_stackoverflow) 1988-12-15 1988-12-15

Publications (2)

Publication Number Publication Date
EP0374585A1 EP0374585A1 (de) 1990-06-27
EP0374585B1 true EP0374585B1 (de) 1993-11-03

Family

ID=6369249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122474A Expired - Lifetime EP0374585B1 (de) 1988-12-15 1989-12-06 Verfahren zur Herstellung einer Oberflächenschicht aus Molybdän durch thermisches Spritzen

Country Status (5)

Country Link
EP (1) EP0374585B1 (enrdf_load_stackoverflow)
AT (1) ATE96849T1 (enrdf_load_stackoverflow)
AU (1) AU617563B2 (enrdf_load_stackoverflow)
DE (2) DE3842263C1 (enrdf_load_stackoverflow)
ES (1) ES2047646T3 (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2861900A (en) * 1955-05-02 1958-11-25 Union Carbide Corp Jet plating of high melting point materials
DE2852534A1 (de) * 1977-12-08 1979-07-05 Gte Sylvania Inc Molybdaen-plasma-spritzpulver, methode zu seiner herstellung und daraus hergestellter ueberzug

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407057A (en) * 1965-10-23 1968-10-22 American Metal Climax Inc Molybdenum powder for use in spray coating
IT1003359B (it) * 1973-03-15 1976-06-10 Goetzewerke Lega rispettivamente miscela di polvere per la produzione di stra ti resistenti all usura mediante saldatura di riporto
US3973948A (en) * 1973-11-12 1976-08-10 Gte Sylvania Incorporated Free flowing powder and process for producing it
DE2841552C2 (de) * 1978-09-23 1982-12-23 Goetze Ag, 5093 Burscheid Spritzpulver für die Herstellung verschleißfester Beschichtungen auf den Laufflächen gleitender Reibung ausgesetzter Maschinenteile
US4416421A (en) * 1980-10-09 1983-11-22 Browning Engineering Corporation Highly concentrated supersonic liquified material flame spray method and apparatus
DE3785775T2 (de) * 1986-02-12 1993-08-12 Gte Prod Corp Verfahren zur ueberwachung des sauerstoffgehaltes in einem agglomerierten molybdaenpulver.
US4684400A (en) * 1986-02-20 1987-08-04 Gte Products Corporation Method for controlling the oxygen content in agglomerated molybdenum powders

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2861900A (en) * 1955-05-02 1958-11-25 Union Carbide Corp Jet plating of high melting point materials
DE2852534A1 (de) * 1977-12-08 1979-07-05 Gte Sylvania Inc Molybdaen-plasma-spritzpulver, methode zu seiner herstellung und daraus hergestellter ueberzug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Beschluss DEUTSCHES PATENTAMT v. 17.02.92 (P 384263.8-45) *

Also Published As

Publication number Publication date
DE3842263C1 (enrdf_load_stackoverflow) 1990-06-13
ATE96849T1 (de) 1993-11-15
DE58906109D1 (de) 1993-12-09
ES2047646T3 (es) 1994-03-01
EP0374585A1 (de) 1990-06-27
AU617563B2 (en) 1991-11-28
AU4618589A (en) 1990-06-21

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