EP0719594A1 - Procédé pour revêtir un objet, notamment des ustentiles culinaires, et objet ainsi revêtus - Google Patents

Procédé pour revêtir un objet, notamment des ustentiles culinaires, et objet ainsi revêtus Download PDF

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Publication number
EP0719594A1
EP0719594A1 EP95810812A EP95810812A EP0719594A1 EP 0719594 A1 EP0719594 A1 EP 0719594A1 EP 95810812 A EP95810812 A EP 95810812A EP 95810812 A EP95810812 A EP 95810812A EP 0719594 A1 EP0719594 A1 EP 0719594A1
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EP
European Patent Office
Prior art keywords
layer
hard material
webs
coating
web
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Withdrawn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
EP95810812A
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German (de)
English (en)
Inventor
Stefan Hort
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0719594A1 publication Critical patent/EP0719594A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • B05D5/086—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers having an anchoring layer
    • 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
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C4/18—After-treatment

Definitions

  • the invention relates to a coating method according to the preamble of patent claim 1 and to a coated object according to the preamble of patent claim 9.
  • Fluoropolymer in particular P oly t etra f luor e thlyen (PTFE -) - layers are applied to metals, so that these hardly or not wettable, low or no adhesion to most of the existing materials, a low friction coefficient, a good heat resistance without Loss of coating properties, good electrical properties and excellent chemical resistance even to aggressive chemicals and solvents.
  • PTFE - P oly t etra f luor e thlyen
  • An oxynitride is composed of oxides and nitrides of one and the same element or different elements, the ratio not having to be stoichiometric. The same applies to carbonitrides and carbooxynitrides.
  • a method of this type is known from EP-B 0 365 485.
  • the surface to be coated was roughened with a coarse roughness, which was superimposed on a fine one.
  • the object thus roughened was heated to at least 400 ° C. before coating and kept at this temperature during the application of a hard material layer composed of an aluminum oxide-titanium oxide powder mixture.
  • a polyfluoroethylene suspension was then applied to the cooled object, which was then baked as a non-stick layer.
  • From DE-B 36 44 211 is the coating of an iron soleplate with a hard material layer in a thermal Spray method known, which had a relatively rough, wave crests and valleys surface. This rough surface was then smoothed with a particularly lubricious, anti-adhesive and sealing organic binder. The roughness could also be reduced by grinding. A mixture of Al 2 O 3 and TiO 2 was used as the material for the hard material layer.
  • the object of the invention is to provide a simple and therefore inexpensive coating method in which the object base surface carrying the coating is adequately protected against corrosive influences in order to achieve a long coating life while avoiding its detachment from the object base surface.
  • the object is achieved with respect to the coating method by claim 1 and the coated object by claim 6.
  • the entire surface to be coated is no longer sprayed as uniformly as possible, but rather “coating lines” overlapping one another are applied next to and on top of one another in a "scanning method".
  • the procedure is now preferably such that the further web layer to be applied over a layer of webs covers the lateral overlap regions of the layer below.
  • the temperature of the sprayed material and the scanning speed are now coordinated with one another in such a way that adjacent web areas can be melted or melted on, respectively.
  • Adjacent webs should overlap on the sides at a flank height of 30% to 80%.
  • a lateral overlap of the webs with a flank height between 50% and 67% (2/3) has advantageously resulted.
  • a complete overlap is also possible.
  • the corundum powder has fine grains to which coarse grains are mixed.
  • the coarse grains produce a roughness of one hundred to two hundred micrometers on the surface 1 of the object base 3 to be coated. This roughly roughened surface structure is, as indicated in the schematic cross section in FIG. 1 , a finer roughness by the fine Grains of about ten to thirty microns in diameter are superimposed.
  • the whole object is heated in an oven to about 450 ° C, if the material z. B. is an aluminum mold casting alloy with about 10% to 12% silicon. The condition for other materials is discussed below.
  • the hot object 5 to be coated is clamped onto a heatable turntable 7 , over which a plasma spray nozzle 11 , which can be moved linearly and radially to the axis of rotation 9 of the turntable 7, can be moved.
  • the plasma spray nozzle 11 has two gas inlets 13a and 13b for e.g. B. hydrogen and argon, an inlet 14 for the material to be sprayed on thermally, here for example aluminum oxide powder, to which about 3% of titanium oxide is added.
  • the plasma is generated here, for example, by means of an electrical discharge from an electrode 16 to the grounded nozzle walls.
  • the material introduced through inlet 14 has a grain size of approximately ten micrometers.
  • the object is kept at a temperature of 450 ° C.
  • the turntable 7 is now set in rotation and the nozzle 11 is moved from the edge of the object 5 to the center thereof. This results in a spiral overlap line 15 of adjacent "spray tracks" on the surface 1 .
  • the rotational speed and the linear displacement speed of the nozzle 11 are now coordinated with one another in such a way that a lateral overlap 15 of adjacent webs at a flank height h of 50% of the sprayed web height b , here about 15 ⁇ m.
  • the speed of rotation is selected as a function of the thermal data of the material to be sprayed on so that the material newly applied in the adjacent path 19 x, n always follows the material that follows Edge area of the previously applied web 19 x, (n-1) or 19 (x-1), k and 19 (x-1), (k + 1) softens. Softening is understood to mean melting, melting or sintering. Which effect is now sought depends on the material of the webs 19 used and can be adjusted via the material temperature and the relative speed.
  • the meaning of the indices is shown below.
  • the melting zones 15 guarantee a largely tight connection of adjacent webs. However, they can still be recognized in a thin section of the coating.
  • the total layer thickness inevitably increases, since the web height b is mainly determined by the granularity of the material used.
  • a large layer thickness results in excellent insulation of the surface 1 ; however, due to its excessive strength as a result of internal tensions, it is also more prone to local tension cracks. Too few layers result in reduced tightness.
  • the tightness also depends on the degree of lateral overlap 15 of adjacent sheets 19 x, (n-1) and 19 x , n , since a certain amount of heat is required to melt on the adjacent previously applied sheet 19 x, (n-1) , which depends on the amount of heat from the adjacent material.
  • 15 adjacent webs 19 x, (n-1) and 19 x, n should overlap at a flank height h of 30% to 80%.
  • Preferred results for the material used here are 50% to 67% of the web height b .
  • the total layer thickness of the hard material layer applied here is between 50 ⁇ m and 200 ⁇ m, preferably 100 ⁇ m.
  • the article 5 After the application of the hard material layer 17 in the six web layers 19a to 19f , the article 5 is allowed to cool to room temperature in order to apply a suspension of a fluoropolymer, in particular PTFE, as a non-stick coating 21 . This suspension penetrates into the roughness and pores, in particular of the top web layer 19f of the hard material layer 17 . After application of the suspension, the article 5 is heated in an oven in several stages (100 ° C, 250 ° C, 400 ° C) to 400 ° C to 430 ° C and remains at this final temperature for ten to fifteen minutes to the PTFE burn to a layer 21 forming the non-stick coating.
  • a fluoropolymer in particular PTFE
  • the final temperature is above the softening temperature of 360 ° C of the PTFE. Only in this way are the suspension particles sintered into a tough and elastic layer 21 , which conforms to the irregularities of the uppermost layer 19f with a layer thickness of ten to twenty Micrometer hugs. Because of this non-flat surface, a greatly enlarged surface of the PTFE layer 21 has been created, which is extremely resistant to thermal dilatation and does not show the slightest tendency to crack, since it can be pulled apart like an "accordion".
  • a smaller or larger web spacing and thus a smaller or greater lateral coverage of the webs 19 can now be selected in the uppermost web layer 19f of the hard material layer 17 . This also influences the porosity of this web layer.
  • Another hard material can of course also be used for the top web row layer.
  • the width of the lanes depends u. a after the nozzle 11 used and is in the millimeter range. It it to be noted here that the width of the sheets 19 is shown swaged over the height in Fig. 1
  • the generation of the structured surface 1 by the sandblasting method described above can also be achieved in two work steps, in which case first coarse sandblasting is carried out, then fine sandblasting.
  • One of the advantages achieved by the invention is essentially to be seen in the fact that by keeping the surface 1 to be coated at least 400 ° C. during the thermal spraying of the ceramic material for the hard material layer 17 , supported by the fine roughness produced by the fine-grained sandblasting , a very good adhesion of the ceramic layer is achieved and, in addition, the coarse roughness gives the applied layers a ripple, which can compensate for their dilatation due to heating and cooling of the object and thus counteracts cracking of the layers.
  • an aluminum oxide hard material layer with a ductility additive made of titanium dioxide instead of an aluminum oxide hard material layer with a ductility additive made of titanium dioxide, however, other materials mentioned in the introduction can also be used with the coating method according to the invention. Instead of entering the aluminum oxide in the nozzle 11 , it can also be oxidized in the nozzle if there is an excess of oxygen. Also, the chemical compound applied as hard metal can only take place in the nozzle by oxidation, nitiration or carbide formation. Which process is selected depends on the materials used and the heating process.
  • a primer for the PTFE top layer can be used, which also closes the pore openings.
  • the plasma spray method described above as a thermal spray method can u. a. by flame spraying, arc spraying, high speed plasma spraying, high speed spraying, using a laser beam, ...
  • the invention is not limited to the production of kitchen appliances.
  • ironing surfaces of irons, coatings of bearing shells, etc. can be produced. That is, any type of coating in which a layer similar to PTFE (non-stick layer) has to be applied to a hard material layer.
  • PTFE non-stick layer
  • the webs can also be linear Scanning methods are applied.
  • the nozzle or the object or both can be moved accordingly.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
EP95810812A 1994-12-27 1995-12-22 Procédé pour revêtir un objet, notamment des ustentiles culinaires, et objet ainsi revêtus Withdrawn EP0719594A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3941/94 1994-12-27
CH394194 1994-12-27

Publications (1)

Publication Number Publication Date
EP0719594A1 true EP0719594A1 (fr) 1996-07-03

Family

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Family Applications (1)

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EP95810812A Withdrawn EP0719594A1 (fr) 1994-12-27 1995-12-22 Procédé pour revêtir un objet, notamment des ustentiles culinaires, et objet ainsi revêtus

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EP (1) EP0719594A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831290A2 (fr) * 1996-08-17 1998-03-25 Bauermeister Verfahrenstechnik GmbH Refroidisseur à couche mince
WO2001049424A2 (fr) * 1999-12-29 2001-07-12 Volkmar Eigenbrod Procede de realisation d'un revetement anti-adherent, revetement anti-adherent et utilisation d'un revetement anti-adherent
WO2005111256A1 (fr) * 2004-05-06 2005-11-24 National Material L.P. Procédé d'obtention d'un revêtement anticorrosion anti-adhérent
EP2308607A1 (fr) * 2009-10-12 2011-04-13 RHENOTHERM Kunststoffbeschichtungs GmbH Montage de revêtement
EP2319632A1 (fr) * 2009-10-30 2011-05-11 The Boeing Company Procédé et structure de fabrication de revêtement résistant aux contaminants
EP2599890A1 (fr) * 2011-12-01 2013-06-05 Siemens Aktiengesellschaft Couche en céramique protégée contre l'éclatement et système de couche
US10188103B2 (en) 2008-09-15 2019-01-29 The Boeing Company Antimicrobial coating fabrication method and structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331155A2 (fr) * 1988-03-02 1989-09-06 Scholl, Harald Procédé de revêtement d'ustensiles de ménage et un tel ustensile
EP0365485A1 (fr) * 1988-10-21 1990-04-25 Hort-Revetements Sa Procédé pour appliquer une couche antiadhésive sur une surface d'un article
EP0510546A1 (fr) * 1991-04-23 1992-10-28 Winfried Heinzel Procédé pour le revêtement d'utensiles de ménage ou de cuisine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331155A2 (fr) * 1988-03-02 1989-09-06 Scholl, Harald Procédé de revêtement d'ustensiles de ménage et un tel ustensile
EP0365485A1 (fr) * 1988-10-21 1990-04-25 Hort-Revetements Sa Procédé pour appliquer une couche antiadhésive sur une surface d'un article
EP0510546A1 (fr) * 1991-04-23 1992-10-28 Winfried Heinzel Procédé pour le revêtement d'utensiles de ménage ou de cuisine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0831290A2 (fr) * 1996-08-17 1998-03-25 Bauermeister Verfahrenstechnik GmbH Refroidisseur à couche mince
EP0831290A3 (fr) * 1996-08-17 1999-06-23 Bauermeister Verfahrenstechnik GmbH Refroidisseur à couche mince
WO2001049424A2 (fr) * 1999-12-29 2001-07-12 Volkmar Eigenbrod Procede de realisation d'un revetement anti-adherent, revetement anti-adherent et utilisation d'un revetement anti-adherent
WO2001049424A3 (fr) * 1999-12-29 2002-02-14 Volkmar Eigenbrod Procede de realisation d'un revetement anti-adherent, revetement anti-adherent et utilisation d'un revetement anti-adherent
WO2005111256A1 (fr) * 2004-05-06 2005-11-24 National Material L.P. Procédé d'obtention d'un revêtement anticorrosion anti-adhérent
US10188103B2 (en) 2008-09-15 2019-01-29 The Boeing Company Antimicrobial coating fabrication method and structure
US10537915B2 (en) 2008-09-15 2020-01-21 The Boeing Company Contaminant resistant coating fabrication structure and method
EP2308607A1 (fr) * 2009-10-12 2011-04-13 RHENOTHERM Kunststoffbeschichtungs GmbH Montage de revêtement
EP2319632A1 (fr) * 2009-10-30 2011-05-11 The Boeing Company Procédé et structure de fabrication de revêtement résistant aux contaminants
EP2599890A1 (fr) * 2011-12-01 2013-06-05 Siemens Aktiengesellschaft Couche en céramique protégée contre l'éclatement et système de couche

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