EP0007664A1 - Procédé de revêtement et de soudure d'articles à l'aide d'alliages de métaux durs - Google Patents

Procédé de revêtement et de soudure d'articles à l'aide d'alliages de métaux durs Download PDF

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Publication number
EP0007664A1
EP0007664A1 EP79200384A EP79200384A EP0007664A1 EP 0007664 A1 EP0007664 A1 EP 0007664A1 EP 79200384 A EP79200384 A EP 79200384A EP 79200384 A EP79200384 A EP 79200384A EP 0007664 A1 EP0007664 A1 EP 0007664A1
Authority
EP
European Patent Office
Prior art keywords
powder
coating material
hard
granular
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.)
Withdrawn
Application number
EP79200384A
Other languages
German (de)
English (en)
Inventor
Gerhard Ing. Grad. Kruske
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.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
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 Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of EP0007664A1 publication Critical patent/EP0007664A1/fr
Withdrawn legal-status Critical Current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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
    • C23C24/085—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder

Definitions

  • the invention relates to a method for coating and soldering workpieces with hard metal alloys, mixtures of hard metal alloys with hard materials or soft or hard soldering in molds, by applying these alloys or mixtures in powder or granular form, optionally with the addition of binders, such as plastics, on the workpieces to be coated in the respective desired layer thickness, adjustment of this layer thickness if necessary by means of spacers and subsequent heat treatment of the whole.
  • the invention has for its object to avoid these and other disadvantages of the prior art and to propose a method which allows a high hard material or carbide concentration to be effected on the upper part of the armor layer which is first exposed to wear.
  • the use value and the service life of the armor should be increased and the coating material used should be fully used.
  • the process should be economical and enable flawless coatings in a short time.
  • This object is achieved in that the powder or granular coating material in the form brings, the workpiece to be coated and heated if necessary under pressure.
  • self-flowing hard metal alloys based on Ni or Cu, mixed with B, Si and / or P, are preferably used as powder or granular coating material.
  • Mixtures of hard metal alloys with hard materials can also be used to the same extent as powder or granular coating material.
  • Hard materials within the scope of the invention are e.g. B. carbides such as WC, borides and nitrides. Minerals such as quartz, corundum and diamond are also suitable as hard materials. Hard materials coated with metals can also be used, as well as mixtures of different hard materials.
  • soft or hard solders based on Cu, Ag, Cd and / or Pb are used as powder or granular coating material.
  • One embodiment of the invention is that after the powder or granular coating material has been introduced, a layer of a material which reduces the tension is introduced.
  • a powder or granular coating material having a lower hardness than the powder or granular coating material first introduced into the mold can be used.
  • the whole can be heated in an oven. It can also be done inductively or used for this a salt bath. Furthermore, the heating can be carried out under an inert atmosphere.
  • the workpiece can also be coated under pressure.
  • solder dissimilar materials for example hard metals
  • This option is important when different stresses on the workpiece require the use of materials with different chemical and physical properties.
  • the cover immediately develops its wear-resistant properties and does not need to be worn down to a certain degree. This significantly increases the durability of the applied layers.
  • the proposed procedure is very versatile.
  • the weight of the coating material of the so-called carrier presses into the melt during the coating process and solidifies it. Due to the weight of the carrier or an additional load, liquid metal is also pressed into narrow gaps or drawn in by capillary action.
  • This process which corresponds to a soldering process, not only makes it possible to coat surfaces lying horizontally, but also surfaces standing vertically and shaped in various other ways. Furthermore, all sides can flow around the liquid alloy Coating of workpieces can be effected. Another advantage is that the powder does not have any run-on problems.
  • the liquid alloy does not flow off or only incompletely on the walls of the mold.
  • the result is that not only is valuable coating material lost, but the mold also has to be cleaned or freed of adhering powder after each coating operation, which is time-consuming.
  • the surface of the armor layer is homogeneous and smooth.
  • a hard metal alloy powder 3 made of CrNiBSi with a fraction of 30 to 100 ⁇ m is loosely poured into the mold 1.
  • the loose powder is pre-compacted by vibration and leveled in the process.
  • the cleaned, dust and dirt-free valve seat ring is placed as workpiece 2 to be coated.
  • Mold 1 and workpiece 2 are heated together in a vacuum oven for 1 1/2 hours at a temperature of 1050 C in a vacuum of 10 -2 to 10 -4 Torr. It is then cooled in the oven and the coated workpiece is removed from the mold.
  • valve cones are coated, as is often the case in the fittings industry.
  • Form 1 made of porcelain with a dimensionally accurate and particularly smooth inner surface the coating material 3, a Co-Cr-WB hard alloy with approx. Workpiece 2 is placed on a powder surface 3 and fixed by a guide 8, so that vertical immersion into the melt ensures is guaranteed.
  • this guide takes over the function of the spacer in that it only allows immersion to a pre-calculated depth.
  • the powder is melted by inductive heating in an inert atmosphere.
  • a tightly tolerated coating is achieved, so that only a very fine machining is required to achieve the tightest tolerances and the highest surface smoothness.
  • the highly wear-resistant hard alloy in powder form 3 consisting of a mixture with 50% by weight Ni-Cr-BrSi with approx. 60 HRc and tungsten carbides, is introduced and leveled in form 1.
  • a stress-relieving Ni-Cr-B-Si alloy with 30 - 35 HRc 5 is also added as the second alloy.
  • the carrier 2 is placed on this depot, which has been provided on the inside with a spacer 4 consisting of Ni-Cr-B-Si bare rods and a sand cast core.
  • the fusion bonding was carried out in accordance with Example 1.
  • the clamping forces are transmitted to the tough support by using a steel support 2 made of, for example, St 37.
  • a steel support 2 made of, for example, St 37.
  • a double or triple fill of alloys is used different chemical composition and hardness. This relieves high stresses that act on the brittle wear layer in the event of heavy impact, impact or pressure loads.
  • a carrier is placed as a workpiece 2 to be coated from St 37 together with a tube 7 made of austenitic material 1.4571 onto the powder depot 3, consisting of a Ni-Cr-B-Si alloy with 60 HRc.
  • the tube 7 is pressed down to the bottom of the mold. In order to prevent the powder from accumulating on the inside of the tube, it is suctioned off before it is inserted into the furnace.
  • the system is now heated in a vacuum oven above the melting point of the powder.
  • the carrier 2 sinks to the stop attached to the tube 7.
  • the soldering gap between the carrier 2 and the tube 7 is filled with the coating material 3 and a firm connection is produced.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Powder Metallurgy (AREA)
EP79200384A 1978-08-02 1979-07-10 Procédé de revêtement et de soudure d'articles à l'aide d'alliages de métaux durs Withdrawn EP0007664A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2833840 1978-08-02
DE19782833840 DE2833840A1 (de) 1978-08-02 1978-08-02 Verfahren zum beschichten und loeten von werkstuecken mit hartmetall-legierungen

Publications (1)

Publication Number Publication Date
EP0007664A1 true EP0007664A1 (fr) 1980-02-06

Family

ID=6046012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200384A Withdrawn EP0007664A1 (fr) 1978-08-02 1979-07-10 Procédé de revêtement et de soudure d'articles à l'aide d'alliages de métaux durs

Country Status (2)

Country Link
EP (1) EP0007664A1 (fr)
DE (1) DE2833840A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145108A1 (fr) * 1983-10-17 1985-06-19 Crucible Materials Corporation Procédé pour recouvrir un article allié et montage pour ce procédé
EP0108877B1 (fr) * 1982-09-16 1988-08-03 Rabewerk Heinrich Clausing Procédé d'application de revêtements résistant à l'usure sur des surfaces de travail d'outils
EP0257980A3 (en) * 1986-08-21 1989-06-14 Toshiba Kikai Kabushiki Kaisha A method of forming a wear-resistant layer
DE19825538A1 (de) * 1998-06-08 1999-12-09 Verschleis Technik Dr Ing Hans Winkelförmiges Kanten-Verschleißschutzteil, Verwendung desselben und Verfahren zu dessen Herstellung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4606883A (en) * 1983-10-21 1986-08-19 J. Wizemann Gmbh & Co. Method of manufacturing a metallic composite article
DE3434529C2 (de) * 1983-10-21 1988-12-22 J. Wizemann Gmbh U. Co, 7000 Stuttgart Verfahren zur Herstellung eines metallischen Verbundgegenstands

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR38878E (fr) * 1930-07-03 1931-08-08 Thomson Houston Comp Francaise Perfectionnements apportés aux compositions métalliques dures et à leurs procédés de fabrication
FR1464249A (fr) * 1964-12-18 1966-12-30 Siemens Ag Procédé et dispositif de production de couches métalliques de revêtement sur des corps solides
GB1198616A (en) * 1966-10-21 1970-07-15 Johnson Matthey Co Ltd A Method of Forming Sintered Composite Bodies.
DE2050276A1 (de) * 1970-10-13 1972-04-20 Sp Pk I Techno Herstellungsverfahren für verschleißfeste Oberflächen eines stählernen zu einer Gleitpaarung gehörigen Werkstückes
FR2294001A1 (fr) * 1974-12-10 1976-07-09 Bluecher Wahlstatt Leichtmet Procede d'estampage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR38878E (fr) * 1930-07-03 1931-08-08 Thomson Houston Comp Francaise Perfectionnements apportés aux compositions métalliques dures et à leurs procédés de fabrication
FR1464249A (fr) * 1964-12-18 1966-12-30 Siemens Ag Procédé et dispositif de production de couches métalliques de revêtement sur des corps solides
GB1198616A (en) * 1966-10-21 1970-07-15 Johnson Matthey Co Ltd A Method of Forming Sintered Composite Bodies.
DE2050276A1 (de) * 1970-10-13 1972-04-20 Sp Pk I Techno Herstellungsverfahren für verschleißfeste Oberflächen eines stählernen zu einer Gleitpaarung gehörigen Werkstückes
FR2294001A1 (fr) * 1974-12-10 1976-07-09 Bluecher Wahlstatt Leichtmet Procede d'estampage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108877B1 (fr) * 1982-09-16 1988-08-03 Rabewerk Heinrich Clausing Procédé d'application de revêtements résistant à l'usure sur des surfaces de travail d'outils
EP0145108A1 (fr) * 1983-10-17 1985-06-19 Crucible Materials Corporation Procédé pour recouvrir un article allié et montage pour ce procédé
EP0257980A3 (en) * 1986-08-21 1989-06-14 Toshiba Kikai Kabushiki Kaisha A method of forming a wear-resistant layer
DE19825538A1 (de) * 1998-06-08 1999-12-09 Verschleis Technik Dr Ing Hans Winkelförmiges Kanten-Verschleißschutzteil, Verwendung desselben und Verfahren zu dessen Herstellung
DE19825538C2 (de) * 1998-06-08 2000-05-25 Verschleis Technik Dr Ing Hans Winkelförmiges Kanten-Verschleißschutzteil, Verwendung desselben und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
DE2833840A1 (de) 1980-02-21

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Inventor name: KRUSKE, GERHARD, ING. GRAD.