US3925570A - Method of coating metallic material onto a metallic substrate - Google Patents

Method of coating metallic material onto a metallic substrate Download PDF

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Publication number
US3925570A
US3925570A US290384A US29038472A US3925570A US 3925570 A US3925570 A US 3925570A US 290384 A US290384 A US 290384A US 29038472 A US29038472 A US 29038472A US 3925570 A US3925570 A US 3925570A
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United States
Prior art keywords
fluidized bed
coated
workpiece
coating
regions
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
US290384A
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English (en)
Inventor
Friedhelm Reinke
Edgar Stengel
Friedhelm Emde
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.)
SMS Elotherm GmbH
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AEG Elotherm GmbH
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Filing date
Publication date
Application filed by AEG Elotherm GmbH filed Critical AEG Elotherm GmbH
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Publication of US3925570A publication Critical patent/US3925570A/en
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    • 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
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer

Definitions

  • the invention relates to the application of a coating of metallic material to prescribed surface areas, particularly of a metal workpiece.
  • workpieces are needed in which portions of the workpiece surface, for instance an as yet unfinished metal part selected be cause of its mechanical strength, are coated with a different metallic material to provide, for instance, special hardness or resistance to wear.
  • metallic materials may be metals, alloys or intermetallic compounds. It is frequently important that the two materials form an intimate bond at their contacting surfaces.
  • a metallic coating to a metallic base material of different kind of metal is by spraying.
  • the coating material is sprayed in the form of fine droplets by means of a gas or plasma flame.
  • the bond between the coating material and the base material is often rather poor.
  • it is difficult to produce coatings of uniform thickness This is particularly true when surfaces of complex geometry are to be coated.
  • the method proposed by the present invention which consists in immersing at least the surface regions of the workpiece that are to be coated in a fluidized bed in which the material that is to be applied is maintained in powder form in a fluidized state by an ascending current of gas, and in inductively heating in the fluidized bed a surface layer of the workpiece in the regions that are to be coated.
  • the fluidizing gas may be an inert gas and particularly a noble gas, such as Argon.
  • a surface layer of regions to which the powder has been applied in the fluidized bed is again inductively heated outside the fluidized bed.
  • the renewed inductive heating outside the fluidized bed may be carried out in the fluidizing gas used for maintaining the fluidized bed.
  • the workpiece surfaces that are to be coated inside the fluidized bed are traversed past an inductive energy transducer.
  • the surface regions that are to be coated may with advantage again traverse an inductive energy transducer outside the fluidized bed.
  • an inductive transducer which has effected the application of the powder inside the fluidized bed may be withdrawable from the fluidized bed at the same time as the workpiece to subject the surface regions that are to be coated to reheating.
  • yet another modification of the proposed method comprises repeating the sequence of treating steps at least once for the purpose of producing coatings of greater thickness.
  • apparatus preferably includes a tank having with a perforated bottom for receiving the coating material in powder form, means for generating an ascending current of fluidizing gas in the tank, holding means for holding the workpiece in a position in which it is at least partly immersed in the fluidized bed and an inductor located in heating position in relation to the surfaces of the workpiece that are to be coated in the fluidized bed.
  • the holding means for holding the workpiece in a process involving progressively feeding the workpiece may with advantage be adapted to traverse the workpiece past the induct or in the fluidized bed.
  • the holding means may rotate the workpiece about its symmetry axis.
  • the holding means may be attached to a vertically movable slide and an inductor coil may be attached to the slide by its feeding conductors, means being provided for slidably moving the slide from a lower position in which the inductor coil and the region of the workpiece surface that is to be coated are below the surface level of the fluidized bed into an upper position in which both are outside the level of the fluidized bed.
  • the inductor coil may embrace the tank containing the fluidized bed and may thus always remain outside the fluidized bed.
  • FIGS. 1 and 2 are two schematic elevations of apparatus for applying a coating to peripheral surface regions of an axially symmetrical workpiece.
  • FIG. 3 shows a further embodiment of the invention.
  • the workpiece is a circular knife 1 which is to receive a coating on both sides of its cutting edge 2.
  • Circular knife 1 is rotably mounted in a convention chucking device generally indicated by 3 and adapted to be rotated about a horizontal axis in the direction indicated by an arrow 4.
  • Part of the circumference of the circular knife dips into a tank 5 which is provided with a perforated bottom 6.
  • the tank contains a fluidized solids bed 7 in which the coating material that is to be applied to the edge 2 of the blade is kept in suspension in an ascending current of a fluidizing gas which enters through the perforated bottom 6.
  • a suitable fluidizing gas may be Argon.
  • an inductor Located inside fluidized bed 7 is an inductor provided with a heating conductor loop 8 fed with a high frequency current.
  • the conductor loop embraces a portion of the cutting edge 2 of the circular knife 1.
  • a second inductor comprising a similar heating conductor loop 9 is located outside the fluidized bed in a corresponding position in relation to the cutting edge 2 of the circular knife.
  • the chucking device 3 rotates circular knife 1 in the direction indicated by arrow 4 so that the cutting edge of knife 1 passes between heating conductors 8 and 9.
  • cutting edge 2 of circular knife 1 can be inductively heated to a temperature which is slightly above the melting temperature of the coating material.
  • the powder suspended in bed 7 cakes to the inductively heated part of circular knife 1 and then fuses to this region progressively from the surface of the base material to the outside.
  • the regions of circular knife I to which the powdered coating material has been applied in this fluidized bed are now moved out of bed 7 by the rotation of circular knife I in the direction of arrow 4 and passed through heating conductor 9 which is likewise fed with the high frequency current and these regions are thus reheated and thereby homogenized.
  • conductors 9 are arranged so that the gas exiting from tank 5 surrounds conductor 9 as it inductively reheats cutting edge 2.
  • the thickness of the coating can be varied by adjusting the speed of rotation of the circular knife. Further the above steps can be repeated as many times as desired to coat the workpiece to any desired thickness while still obtaining an excellent bond between the two metals.
  • FIG. 3 the end portion 11 of a bolt-shaped workpiece which is to be coated dips into a cylindrical tank 12 in which the powder of coating material is maintained in a fluidized state 13 in the same fashion as in FIGS. 1 and 2.
  • a collet 14 the workpiece is attached to a slide 15 which is vertically movable in a machine column indicated at 16.
  • Slide 15 also carries feeder conductors 17 of a multiple coil inductor 18.
  • inductor l8 embraces cylindrical tank 12 containing the fluidized bed and extends the length of the surface region 1] on the workpiece 10 that is to be coated.
  • a method of applying a coating of metallic material to specified metal regions on a base material of a different metal comprising the steps of:
  • step of inductively heating outside said bed includes the step of moving at least the surface regions that are to be coated through an inductive energy transducer outside the fluidized bed.
  • step of inductively heating includes the step of moving at least the region of the workpiece that is to be coated through an inductive energy transducer inside the fluidized bed.
  • a method according to claim 1 including the steps of withdrawing an inductive energy transducer which has caused the powder to be deposited on the surfaces in the fluidized bed from the fluidized bed together with the workpiece and thereafter reheating the surfaces that are to be coated with that transducer outside said bed.
  • a method according to claim 1 including repeating the above steps until a desired thickness of coating is produced

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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)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
US290384A 1971-09-30 1972-09-19 Method of coating metallic material onto a metallic substrate Expired - Lifetime US3925570A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712148779 DE2148779A1 (de) 1971-09-30 1971-09-30 Verfahren und vorrichtung zum aufbringen eines ueberzuges aus metallischem werkstoff

Publications (1)

Publication Number Publication Date
US3925570A true US3925570A (en) 1975-12-09

Family

ID=5821020

Family Applications (1)

Application Number Title Priority Date Filing Date
US290384A Expired - Lifetime US3925570A (en) 1971-09-30 1972-09-19 Method of coating metallic material onto a metallic substrate

Country Status (6)

Country Link
US (1) US3925570A (de)
JP (1) JPS4848332A (de)
DE (1) DE2148779A1 (de)
FR (1) FR2154730A1 (de)
GB (1) GB1377107A (de)
IT (1) IT966093B (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4124729A (en) * 1975-09-12 1978-11-07 Kishimoto Sangyo Co., Ltd. Method of multiple powder coating employing geneva gears
US4170494A (en) * 1976-06-07 1979-10-09 Kobe Steel, Ltd. Surface treatment for metal according to fluidized bed system
US4806388A (en) * 1986-07-17 1989-02-21 Toyota Jidosha Kabushiki Kaisha Method and apparatus for coating metal part with synthetic resin
US4806387A (en) * 1986-08-05 1989-02-21 Toyota Jidosha Kabushiki Kaisha Method for coating metal part with synthetic resin
US4911949A (en) * 1986-08-27 1990-03-27 Toyota Jidosha Kabushiki Kaisha Method for coating metal part with synthetic resin including post coating step for heating coated part to eleminate voids
US5047381A (en) * 1988-11-21 1991-09-10 General Electric Company Laminated substrate for catalytic combustor reactor bed
US20070116894A1 (en) * 2003-02-10 2007-05-24 Toshio Narita Method of forming high temperature corrosion resistant film
US20090311545A1 (en) * 2008-06-13 2009-12-17 Caterpillar Inc. Method of coating and induction heating a component

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5373428A (en) * 1976-12-13 1978-06-29 Showa Aluminium Co Ltd Method of coating different metal onto surface of metal
JPS60181278A (ja) * 1984-02-27 1985-09-14 Res Dev Corp Of Japan 超微粒子塗膜の形成法
JPS6110896U (ja) * 1984-06-25 1986-01-22 積水化成品工業株式会社 装飾体
US4624860A (en) * 1985-10-15 1986-11-25 Imperial Clevite Inc. Method of applying a coating to a metal substrate using brazing material and flux
CN108907437A (zh) * 2018-06-20 2018-11-30 重庆川仪调节阀有限公司 一种电磁感应加热和重熔球体喷焊系统及方法

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2844489A (en) * 1957-12-20 1958-07-22 Knapsack Ag Fluidized bed coating process
US3020210A (en) * 1955-02-24 1962-02-06 Exxon Research Engineering Co Heat hardening fluid coke compactions
US3031769A (en) * 1958-09-26 1962-05-01 Wilson John Fluid beds
US3032816A (en) * 1957-11-07 1962-05-08 Polymer Corp Coating process and apparatus
US3053704A (en) * 1953-11-27 1962-09-11 Exxon Research Engineering Co Heat treating metals
US3060304A (en) * 1959-07-22 1962-10-23 To A Kako Kabushiki Kaisha Electric direct heating method of heating metallic pieces
US3118773A (en) * 1960-10-14 1964-01-21 Turbo Dynamics Corp Method of preserving foods by heating in a fluidized bed
US3145127A (en) * 1961-06-28 1964-08-18 Gen Electric Method of insulating electrical components, such as small electric motors
US3183113A (en) * 1962-02-20 1965-05-11 Knapsack Ag Fluidized bed coating process and apparatus
US3282249A (en) * 1957-08-06 1966-11-01 Polymer Corp Apparatus for coating filamentary metal article
US3383233A (en) * 1965-12-22 1968-05-14 Park Ohio Industries Inc Method and apparatus for inductively heating a workpiece formed from a highly oxidizable metal
US3419409A (en) * 1967-04-03 1968-12-31 Polymer Corp Process for coating
US3666253A (en) * 1969-12-26 1972-05-30 Yuri Yoshio Fluidized bed furnace

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053704A (en) * 1953-11-27 1962-09-11 Exxon Research Engineering Co Heat treating metals
US3020210A (en) * 1955-02-24 1962-02-06 Exxon Research Engineering Co Heat hardening fluid coke compactions
US3282249A (en) * 1957-08-06 1966-11-01 Polymer Corp Apparatus for coating filamentary metal article
US3032816A (en) * 1957-11-07 1962-05-08 Polymer Corp Coating process and apparatus
US2844489A (en) * 1957-12-20 1958-07-22 Knapsack Ag Fluidized bed coating process
US3031769A (en) * 1958-09-26 1962-05-01 Wilson John Fluid beds
US3060304A (en) * 1959-07-22 1962-10-23 To A Kako Kabushiki Kaisha Electric direct heating method of heating metallic pieces
US3118773A (en) * 1960-10-14 1964-01-21 Turbo Dynamics Corp Method of preserving foods by heating in a fluidized bed
US3145127A (en) * 1961-06-28 1964-08-18 Gen Electric Method of insulating electrical components, such as small electric motors
US3183113A (en) * 1962-02-20 1965-05-11 Knapsack Ag Fluidized bed coating process and apparatus
US3383233A (en) * 1965-12-22 1968-05-14 Park Ohio Industries Inc Method and apparatus for inductively heating a workpiece formed from a highly oxidizable metal
US3419409A (en) * 1967-04-03 1968-12-31 Polymer Corp Process for coating
US3666253A (en) * 1969-12-26 1972-05-30 Yuri Yoshio Fluidized bed furnace

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4124729A (en) * 1975-09-12 1978-11-07 Kishimoto Sangyo Co., Ltd. Method of multiple powder coating employing geneva gears
US4170494A (en) * 1976-06-07 1979-10-09 Kobe Steel, Ltd. Surface treatment for metal according to fluidized bed system
US4806388A (en) * 1986-07-17 1989-02-21 Toyota Jidosha Kabushiki Kaisha Method and apparatus for coating metal part with synthetic resin
US4806387A (en) * 1986-08-05 1989-02-21 Toyota Jidosha Kabushiki Kaisha Method for coating metal part with synthetic resin
US4911949A (en) * 1986-08-27 1990-03-27 Toyota Jidosha Kabushiki Kaisha Method for coating metal part with synthetic resin including post coating step for heating coated part to eleminate voids
US5047381A (en) * 1988-11-21 1991-09-10 General Electric Company Laminated substrate for catalytic combustor reactor bed
US20070116894A1 (en) * 2003-02-10 2007-05-24 Toshio Narita Method of forming high temperature corrosion resistant film
US7378134B2 (en) * 2003-02-10 2008-05-27 Japan Science And Technology Agency Method of forming high temperature corrosion resistant film
US20090311545A1 (en) * 2008-06-13 2009-12-17 Caterpillar Inc. Method of coating and induction heating a component
US8137761B2 (en) 2008-06-13 2012-03-20 Caterpillar Inc. Method of coating and induction heating a component

Also Published As

Publication number Publication date
DE2148779A1 (de) 1973-04-05
IT966093B (it) 1974-02-11
GB1377107A (en) 1974-12-11
JPS4848332A (de) 1973-07-09
FR2154730A1 (de) 1973-05-11

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