EP0839216B1 - Process for producing a non-stick coating and objects provided with such a coating - Google Patents

Process for producing a non-stick coating and objects provided with such a coating Download PDF

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Publication number
EP0839216B1
EP0839216B1 EP95938434A EP95938434A EP0839216B1 EP 0839216 B1 EP0839216 B1 EP 0839216B1 EP 95938434 A EP95938434 A EP 95938434A EP 95938434 A EP95938434 A EP 95938434A EP 0839216 B1 EP0839216 B1 EP 0839216B1
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Prior art keywords
coating
process according
hard material
layer
metal surface
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German (de)
French (fr)
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EP0839216A1 (en
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Klaus Dorfschmidt
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Fissler GmbH
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Fissler GmbH
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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
    • 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
    • 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

Definitions

  • the invention relates to a method for generating a Non-stick coating on the surface of a proportionate soft metal substrate according to claim 1 and one thereafter manufactured article according to claim 24.
  • DE-AS 15 46 934 describes a method for forming a Polytetrafluoroethylene protective layer on cleaned and anodized aluminum objects known in which after cleaning the metal surface a strong intermediate etching treatment in hydrochloric acid and an anodic oxidation is carried out according to the direct current sulfuric acid method, around both the surface abrasion resistance and the scratch resistance and thus the lifespan of the polytetrafluoroethylene layer to increase.
  • the etching treatment produces in the Undercut hollows, their Walls by anodizing with an anodized layer of hard to be coated.
  • the anodized layer is in turn porous and absorbent and takes the protective layer made of polytetrafluoroethylene good on. With the anodic oxidation the in itself a soft surface of the undercut cavities Hardness, the abrasion and the applied protective layer Scratch resistance there.
  • EP-OS 0 424 072 describes a process for the production of an aluminum cookware with a non-stick layer Known for contact with the food, at which a Aluminum substrate at least in the surface area of the to be applied roughened and then anodized becomes.
  • the non-stick layer is then immediately on the anodized surface applied, to improve the Abrasion resistance and scratch resistance the anodization layer generated by hard anodization and the hard anodization layer with a thickness between 15 and 50 ⁇ m.
  • the non-stick layer can be polytetrafluoroethylene (PTFE).
  • the surface roughness is determined by means of etching or sandblasting generated only to improve liability.
  • EP-OS 0 594 374 describes a method for forming a Surface of a cooking vessel facing a cooking material with a Discloses aluminum substrate in which the aluminum substrate first hard anodized, then preferably a layer of material made of ceramic, aluminum oxide or stainless steel sprayed on and then applied a non-stick layer is, the spray layer in the form of hemispherical Particle is formed, whereby the anchoring effect for the non-stick layer is to be improved.
  • EP-OS 0 365 485 discloses a method for producing a non-stick coating in which an aluminum / titanium oxide layer is sprayed onto a surface of a vessel roughened by sandblasting at a temperature of the vessel of at least 400 ° C. After cooling, a fluoropolymer layer is applied and sintered at over 300 ° C.
  • the "roughness depth" which is not defined in more detail, should be between approximately 100 and 200 ⁇ m.
  • a similar process is known from GB-A-2 277 466, in which the roughness depths R a are 4.5-5.5 ⁇ m and 5.0-8.0 ⁇ m, respectively.
  • the object of the present invention is a method and to propose an object manufactured thereafter which is a high quality of the non-stick layer due to functional separation regarding abrasion resistance and scratch resistance is achieved. This task is carried out with the characteristics of Claim 1 solved.
  • R a , R y , P c and t p are the quantities defined in DIN 4762 and 4768 (for determination using the tactile cut method) for the arithmetic mean roughness (R a ), the ten-point height (R z ) and the maximum profile height (R y ), the peak number (P c ) and the profile load share (t p ) (synonymous with the material share M r ).
  • R a is the arithmetic mean of the absolute values of the profile deviations within a reference distance
  • R z is the mean of the absolute values of the heights of the five highest profile peaks and the absolute values of the depths of the five deepest profile troughs within a reference distance
  • R y is the distance between the line of the profile tips (upper contact line) and the line of the profile valleys (lower contact line) within a reference distance
  • P c is the parameter (used by many manufacturers) for the number of profile features per cm that exceed the set upper cutting level and subsequently fall below the lower one
  • t p that in% of the ratio of the load-bearing length of the profile to the reference distance at a certain cutting level.
  • the brackets behind P c indicate the bandwidth determined by the lower and upper cutting level in ⁇ m.
  • Layers that are both wear-resistant and non-stick are designed so that two different Different layers on top of each other or next to each other Perform functions.
  • This principle of separation of functions will used in an optimal manner according to the invention by on a relatively soft (metallic) substrate with (according to roughness depth and the load-bearing component) of a roughness created in a hard material layer (one or more layers) is applied.
  • a hard material layer On this hard material layer then becomes a non-stick layer (one or multilayer), preferably made of a fluorocarbon resin applied, which is particularly in the wells of Hard material layer.
  • the exposed surface of the Non-stick layer can affect the surface roughness Compensate the hard material layer more or less, d. H. e.g. B. also be flat.
  • the hard material tips take over the function of power transmission, while the majority of the area (90 to 99%) the Non-stick effect takes over.
  • the non-stick coating optimal abrasion resistance properties, Scratch resistance and non-stick effect are given.
  • the relatively small one but not too low a share of the surface so that a least possible damage to the non-stick layer if not too large areas between two tips of the roughened Surface is reached.
  • the metal substrate for example shaped the metal substrate, then to achieve the desired one Roughness blasted, the blasted surface possibly chemically cleaned or pickled, then the hard material layer generated or applied, and then the non-stick layer, for example. made of polytetrafluoroethylene (PTFE) or the like. Non-stick systems applied and finally baked or sintered.
  • PTFE polytetrafluoroethylene
  • the non-stick coating produced with the method according to the invention is not only ideal as an interior pan coating, but also for other household appliances, such as irons, cake and casserole dishes, as well as for machine elements, where there is non-stick effect and wear resistance arrives, as with rollers, injection or casting molds and the like ..

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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)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Cookers (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention relates to a process for producing a non-stick coating on the surface of a relatively soft metal substrate such as a substrate of aluminium or aluminium alloy , magnesium or magnesium alloy and/or copper or copper alloy. The metal surface is roughed and then provided with a single-layer or multi-layer coating of a hard material such as a hard anodisation layer or a thermal sprayed layer and then provided with a single-layer or multi-layer non-stick coating, e.g. of fluorocarbon resin such as polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) or tetrafluoroethylene-ethylene copolymer (ETFE). The purpose of the proposed process is in particular to coat the inside of a pan, the surface roughness of the metal surface and/or hard material layer being defined by the following parameters: Ra is between 8 and 30 microns, and or Rz is between 40 and 180 microns, and or Ry is between 50 and 250 microns, and or Pc (1,3) is between 20 and 45 1/cm, and/or tp [10 %] is between 1 and 3 % and or tp [20 %] is between 1 and 10 %.

Description

Die Erfindung betrifft ein Verfahren zur Erzeugung einer Antihaftbeschichtung auf der Oberfläche eines verhältnismäßig weichen Metallsubstrats nach dem Anspruch 1 sowie einen danach hergestellten Gegenstand nach Anspruch 24.The invention relates to a method for generating a Non-stick coating on the surface of a proportionate soft metal substrate according to claim 1 and one thereafter manufactured article according to claim 24.

Aus der DE-AS 15 46 934 ist ein Verfahren zur Bildung einer Polytetrafluoräthylen-Schutzschicht auf gereinigten und anodisch oxidierten Aluminiumgegenständen bekannt, bei welchem nach der Reinigung der Metalloberfläche eine starke Ätzzwischenbehandlung in Salzsäure und eine anodische Oxidation nach dem Gleichstrom-Schwefelsäure-Verfahren vorgenommen wird, um sowohl die flächige Abriebfestigkeit als auch die Kratzfestigkeit und damit die Lebensdauer der Polytetrafluoräthylenschicht zu erhöhen. Die Ätzbehandlung erzeugt in der Leichtmetalloberfläche hinterschnittene Höhlungen, deren Wandungen durch die Anodisierung mit einer Eloxalschicht von hoher Härte überzogen werden. Die Eloxalschicht ist ihrerseits porös und saugfähig und nimmt die Schutzschicht aus Polytetrafluoräthylen gut auf. Mit der anodischen Oxidation erhält die an sich weiche Oberfläche der hinterschnittenen Höhlungen eine Härte, die der aufgetragenen Schutzschicht ihre Abrieb- und Kratzfestigkeit gibt.DE-AS 15 46 934 describes a method for forming a Polytetrafluoroethylene protective layer on cleaned and anodized aluminum objects known in which after cleaning the metal surface a strong intermediate etching treatment in hydrochloric acid and an anodic oxidation is carried out according to the direct current sulfuric acid method, around both the surface abrasion resistance and the scratch resistance and thus the lifespan of the polytetrafluoroethylene layer to increase. The etching treatment produces in the Undercut hollows, their Walls by anodizing with an anodized layer of hard to be coated. The anodized layer is in turn porous and absorbent and takes the protective layer made of polytetrafluoroethylene good on. With the anodic oxidation the in itself a soft surface of the undercut cavities Hardness, the abrasion and the applied protective layer Scratch resistance there.

Aus der EP-OS 0 424 072 ist ein Verfahren zur Herstellung eines Kochgeschirrs aus Aluminium mit einer Antihaftschicht für die Berührung mit dem Kochgut bekannt, bei welchem ein Aluminiumsubstrat wenigstens im Oberflächenbereich der aufzubringenden Antihaftschicht aufgerauht und dann anodisiert wird. Die Antihaftschicht wird dann unmittelbar auf die anodisierte Oberfläche aufgebracht, wobei zur Verbesserung der Abriebfestigkeit und Kratzfestigkeit die Anodisationsschicht mittels Hartanodisation erzeugt und die Hartanodisationsschicht mit einer Stärke zwischen 15 und 50 um erzeugt wird. Die Antihaftschicht kann Polytetrafluoräthylen (PTFE) sein. Die Oberflächenrauheit wird mittels Ätzen oder Sandstrahlen lediglich zur Haftungsverbesserung erzeugt.EP-OS 0 424 072 describes a process for the production of an aluminum cookware with a non-stick layer Known for contact with the food, at which a Aluminum substrate at least in the surface area of the to be applied roughened and then anodized becomes. The non-stick layer is then immediately on the anodized surface applied, to improve the Abrasion resistance and scratch resistance the anodization layer generated by hard anodization and the hard anodization layer with a thickness between 15 and 50 µm. The non-stick layer can be polytetrafluoroethylene (PTFE). The surface roughness is determined by means of etching or sandblasting generated only to improve liability.

Aus der EP-OS 0 594 374 ist ein Verfahren zum Bilden einer dem Kochgut zugewandten Fläche eines Kochgefäßes mit einem Aluminiumsubstrat offenbart, bei welchem das Aluminiumsubstrat zunächst hartanodisiert, dann eine Materialschicht vorzugsweise aus Keramik, Aluminiumoxid oder rostfreiem Stahl aufgespritzt und anschließend eine Antihaftschicht aufgebracht wird, wobei die Spritzschicht in Form halbkugelförmiger Partikel ausgebildet ist, wodurch der Verankerungseffekt für die Antihaftschicht verbessert werden soll.EP-OS 0 594 374 describes a method for forming a Surface of a cooking vessel facing a cooking material with a Discloses aluminum substrate in which the aluminum substrate first hard anodized, then preferably a layer of material made of ceramic, aluminum oxide or stainless steel sprayed on and then applied a non-stick layer is, the spray layer in the form of hemispherical Particle is formed, whereby the anchoring effect for the non-stick layer is to be improved.

Aus der EP-OS 0 365 485 ist ein Verfahren zur Erzeugung einer Antihaftbeschichtung bekannt, bei welchem auf eine durch Sandstrahlung aufgerauhte Oberfläche eines Gefäßes eine Aluminium/Titanoxidschicht bei einer Temperatur des Gefäßes von mindestens 400° C aufgesprüht wird. Nach dem Erkalten wird eine Fluorpolymerschicht aufgebracht und bei über 300° C gesintert. Die nicht näher definierte "Rauhtiefe" soll zwischen etwa 100 und 200 µm betragen. Ein ähnliches Verfahren ist aus der GB-A-2 277 466 bekannt, bei der die Rauhtiefen Ra 4.5-5.5 µm bzw. 5.0-8.0 µm betragen.EP-OS 0 365 485 discloses a method for producing a non-stick coating in which an aluminum / titanium oxide layer is sprayed onto a surface of a vessel roughened by sandblasting at a temperature of the vessel of at least 400 ° C. After cooling, a fluoropolymer layer is applied and sintered at over 300 ° C. The "roughness depth", which is not defined in more detail, should be between approximately 100 and 200 μm. A similar process is known from GB-A-2 277 466, in which the roughness depths R a are 4.5-5.5 µm and 5.0-8.0 µm, respectively.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren und einen danach hergestellten Gegenstand vorzuschlagen, bei welchem eine hohe Qualität der Antihaftschicht durch Funktionstrennung hinsichtlich Abriebfestigkeit und Kratzfestigkeit erreicht wird. Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst. The object of the present invention is a method and to propose an object manufactured thereafter which is a high quality of the non-stick layer due to functional separation regarding abrasion resistance and scratch resistance is achieved. This task is carried out with the characteristics of Claim 1 solved.

Eine weitere Verbesserung ist in Anspruch 2 vorgeschlagen.A further improvement is proposed in claim 2.

Bei Ra, Ry, Pc und tp handelt es sich um die in DIN 4762 und 4768 (für die Ermittlung im Tastschnittverfahren) definierten Größen für den arithmetischen Mittenrauhwert (Ra), die Zehnpunkthöhe (Rz), die maximale Profilhöhe (Ry), die Spitzenzahl (Pc) und den Profiltraganteil (tp) (gleichbedeutend mit dem Materialanteil Mr). Dabei ist Ra der arithmetische Mittelwert der absoluten Werte der Profilabweichungen innerhalb einer Bezugsstrecke, Rz der Mittelwert der Absolutwerte der Höhen der fünf höchsten Profilkuppen und der Absolutwerte der Tiefen der fünf tiefsten Profiltäler innerhalb einer Bezugsstrecke, Ry der Abstand zwischen der Linie der Profilkuppen (obere Berührungslinie) und der Linie der Profiltäler (untere Berührungslinie) innerhalb einer Bezugsstrecke, Pc die (von vielen Herstellern verwendete) Kenngröße für Anzahl der Profilmerkmale pro cm, die das eingestellte obere Schnittniveau überschreiten und nachfolgend das untere unterschreiten, und tp das in % angegebene Verhältnis der tragenden Länge des Profils zur Bezugsstrecke in einem bestimmten Schnittniveau. Der Klammerausdruck hinter Pc gibt in µm die durch unteres und oberes Schnittniveau bestimmte Bandbreite an.R a , R y , P c and t p are the quantities defined in DIN 4762 and 4768 (for determination using the tactile cut method) for the arithmetic mean roughness (R a ), the ten-point height (R z ) and the maximum profile height (R y ), the peak number (P c ) and the profile load share (t p ) (synonymous with the material share M r ). R a is the arithmetic mean of the absolute values of the profile deviations within a reference distance, R z is the mean of the absolute values of the heights of the five highest profile peaks and the absolute values of the depths of the five deepest profile troughs within a reference distance, R y is the distance between the line of the profile tips (upper contact line) and the line of the profile valleys (lower contact line) within a reference distance, P c is the parameter (used by many manufacturers) for the number of profile features per cm that exceed the set upper cutting level and subsequently fall below the lower one, and t p that in% of the ratio of the load-bearing length of the profile to the reference distance at a certain cutting level. The brackets behind P c indicate the bandwidth determined by the lower and upper cutting level in µm.

Schichten, die sowohl verschleißbeständig als auch antihaftend sind, können derart ausgelegt sein, daß zwei unterschiedliche Schichten übereinander bzw. nebeneinander unterschiedliche Funktionen ausüben. Dieses Prinzip der Funktionstrennung wird erfindungsgemäß in optimaler Weise eingesetzt, indem auf ein relativ weiches (metallisches) Substrat mit (nach Rauhtiefe und Traganteil) gezielt hergestellter Rauheit eine Hartstoffschicht (ein- oder mehrlagig) an- bzw. aufgebracht wird. Auf diese Hartstoffschicht wird dann eine Antihaftschicht (ein- oder mehrlagig) vorzugsweise aus einem Fluorkohlenstoffharz aufgetragen, welches sich insbesondere in die Vertiefungen der Hartstoffschicht legt. Die frei liegende Oberfläche der Antihaftschicht kann dabei die Oberflächenrauhigkeit der Hartstoffschicht mehr oder weniger ausgleichen, d. h. z. B. auch eben sein. Bei Verschleißbeanspruchung der Beschichtung übernehmen die Hartstoffspitzen die Funktion der Kraftübertragung, während der Großteil der Fläche (90 bis 99%) die Antihaftwirkung übernimmt. Durch gezielte Oberflächenrauheit unter Einhaltung der angegebenen Kenngrößen für das Metallsubstrat bzw. die Hartstoffschicht können der Antihaftbeschichtung optimale Eigenschaften hinsichtlich Abriebfestigkeit, Kratzfestigkeit und Antihaftwirkung gegeben werden. Von besonderer Bedeutung ist hierbei offenbar der relativ kleine aber nicht zu geringe Traganteil der Oberfläche, so daß eine geringstmögliche Beschädigung der Antihaftschicht bei nicht zu großen Flächen zwischen zwei Spitzen der aufgerauhten Oberfläche erreicht wird. Durch die nach Anspruch 1 bzw. 2 vorgesehene Kenngrößenverknüpfung in bestimmten Wertebereichen werden zur Funktionstrennung von Verschleißbeständigkeit und Antihaftverhalten eine optimierte Verschleißbeständigkeit der Hartstoffspitzen selbst und damit des Schichtsystems insgesamt sowie durch den definierten Spitzenabstand der Oberfläche die Antihaftschicht bestmöglich geschützt. Spitze Gegenstände, wie Gabeln oder dgl., und Schneidgeräte, wie Messer oder dgl., können so nicht in die Täler der Schichtoberfläche eindringen.Layers that are both wear-resistant and non-stick are designed so that two different Different layers on top of each other or next to each other Perform functions. This principle of separation of functions will used in an optimal manner according to the invention by on a relatively soft (metallic) substrate with (according to roughness depth and the load-bearing component) of a roughness created in a hard material layer (one or more layers) is applied. On this hard material layer then becomes a non-stick layer (one or multilayer), preferably made of a fluorocarbon resin applied, which is particularly in the wells of Hard material layer. The exposed surface of the Non-stick layer can affect the surface roughness Compensate the hard material layer more or less, d. H. e.g. B. also be flat. In the event of wear on the coating the hard material tips take over the function of power transmission, while the majority of the area (90 to 99%) the Non-stick effect takes over. Through targeted surface roughness in compliance with the specified parameters for the metal substrate or the hard material layer can the non-stick coating optimal abrasion resistance properties, Scratch resistance and non-stick effect are given. Of Of particular importance is obviously the relatively small one but not too low a share of the surface, so that a least possible damage to the non-stick layer if not too large areas between two tips of the roughened Surface is reached. By the claim 1 or 2 intended linking of parameters in certain value ranges are used to separate the wear resistance and Non-stick behavior an optimized wear resistance of the Hard material tips themselves and thus the layer system as a whole as well as the defined tip distance of the surface Non-stick layer optimally protected. Pointed objects, like Forks or the like, and cutters such as knives or the like, cannot penetrate into the valleys of the layer surface.

Vorteilhafte Ausgestaltungen des Erfindungsgedankens ergeben sich aus den weiteren Unteransprüchen ebenso wie ein unter Anwendung des erfindungsgemäße Verfahrens hergestellter Gegenstand.Advantageous refinements of the inventive concept result itself from the further subclaims as well as one under Application of the method according to the invention Object.

Für die Herstellung eines Kochgeschirrs wird bspw. zunächst das Metallsubstrat geformt, dann zur Erzielung der gewünschten Rauheit gestrahlt, die gestrahlte Oberfläche eventuell chemisch gereinigt bzw. gebeizt, dann die Hartstoffschicht erzeugt bzw. aufgetragen, und danach die Antihaftschicht bspw. aus Polytetraflouräthylen (PTFE) oder dgl. Antihaftsysteme aufgetragen sowie abschließend eingebrannt bzw. gesintert.For the production of a cookware, for example shaped the metal substrate, then to achieve the desired one Roughness blasted, the blasted surface possibly chemically cleaned or pickled, then the hard material layer generated or applied, and then the non-stick layer, for example. made of polytetrafluoroethylene (PTFE) or the like. Non-stick systems applied and finally baked or sintered.

Die mit dem erfindungsgemäßen Verfahren erzeugte Antihaftbeschichtung eignet sich nicht nur vorzüglich als Pfanneninnenbeschichtung, sondern auch für sonstige Haushaltsgeräte, wie Bügeleisen, Kuchen- und Auflaufformen, sowie für Maschinenelemente, bei denen es auf Antihaftwirkung und Verschleißfestigkeit ankommt, wie bei Walzen, Spritz- oder Gießformen und dgl..The non-stick coating produced with the method according to the invention is not only ideal as an interior pan coating, but also for other household appliances, such as irons, cake and casserole dishes, as well as for machine elements, where there is non-stick effect and wear resistance arrives, as with rollers, injection or casting molds and the like ..

Claims (25)

  1. Process for producing a non-stick coating on the surface of a relatively soft metal substrate, the metal surface of which is roughened as well as provided with a single-layer or a multi-layer coating of a hard material and subsequently with a single-layer or a multi-layer non-stick coating, the surface roughness of the metal surface and/or the hard material layer being defined by the following parameters:
    Ra
    between 8 and 30 µm and
    Pc (1, 3)
    between 20 and 45 1/cm and
    tp [10%]
    between 1 and 3%,
    Ra being the arithmetic average roughness value, Pc the peak count and tp the bearing ratio according to DIN 4762.
  2. Process according to claim 1, the hard material coating being provided by conversion of the metal surface or as a thermal spray coating and the surface roughness of the hard material coating being defined by the following parameters due to roughening of the metal surface:
    Ra
    between 8 and 15 µm (conversion coating) and 10 and 15 µm (thermal spay coating), respectively, and
    Pc (1, 3)
    between 25 and 40 1/cm (conversion coating) and 20 and 45 1/cm (thermal spray coating), respectively, and
    tp [10%]
    between 1 and 2 (conversion coating) and 1 and 3 (thermal spray coating), respectively.
  3. Process according to claim 1 or 2, the ten-point average roughness Rz as a parameter of the surface roughness of the metal surface and/or the hard material coating according to DIN 4762 being between 40 and 180 µm.
  4. Process according to one of claims 1 to 3, the maximum roughness height Ry as a parameter of the surface roughness of the metal surface and/or the hard material coating according to DIN 4762 being between 50 and 250 µm.
  5. Process according to one of claims 1 to 4, the bearing ratio tp [20%] as a parameter of the surface roughness of the metal surface and/or the hard material coating according to DIN 4762 being between 1 and 10%.
  6. Process according to one of claims 1 to 5, the hard material coating being provided by conversion of the metal surface or as a thermal spray coating and the ten-point-height Rz as a parameter of the surface roughness of the metal surface according to DIN 4762 being between 40 and 80 µm (conversion coating) and 40 and 120 µm (thermal spray coating), respectively.
  7. Process according to one of claims 1 to 6, the hard material coating being provided by conversion of the metal surface or as a thermal spray coating and the maximum roughness height Ry as a parameter of the surface roughness of the metal surface according to DIN 4762 being between 50 and 120 µm (conversion coating) and 50 and 150 pm (thermal spray coating), respectively.
  8. Process according to one of claims 1 to 7, the hard material coating being provided by conversion of the metal surface or as a thermal spray coating and the bearing ratio tp [20%] as a parameter of the surface roughness of the metal surface according to DIN 4762 between 1 and 8 (conversion coating) and 1 and 10 (thermal spray coating), respectively.
  9. Process according to one of claims 1 to 8, the metal substrate being a substrate of aluminum, an aluminum alloy, a magnesium alloy and/or a copper alloy.
  10. Process according to one of claims 1 to 9, the hard material coating being provided by hard anodization.
  11. Process according to one of claims 1 to 10, the non-stick layer being of a fluorocarbon resin.
  12. Process according to one of claims 1 to 11, the non-stick coating being of polytetrafluorethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) or tetrafluoroethylene-ethylene copolymer (ETFE).
  13. Process according to one of claims 1 to 112, the production of the surface roughness of the metal surface being effected by blasting with blasting material.
  14. Process according to claim 13, the blasting being effected by injection blasting, pressure blasting or ejection blasting.
  15. Process according to claim 13 or 14, the blasting being effected with anorganic (ceramic) or hard metal blasting material.
  16. Process according to one of claims 13 to 15, the blasting being effected with Al2O3 (corundum, mixed corundum, noble corundum), SiC or CB4.
  17. Process according to one of claims 1 to 16, the blasting of the metal surface by means of blasting material being is effected with a grain size of at least K 30 (50 to 700 µm).
  18. Process according to claim 17, the grain size being between K 24 (595 to 841 µm) and K 20 (841 to 1190 µm).
  19. Process according to one of claims 1 to 18, the hard material coating being provided with a thickness of > 10 µm.
  20. Process according to claim 19, the hard material coating being provided with a thickness of between 30 and 100 µm.
  21. Process according to one of claims 1 to 20, the hard material layer being provided as an anodisation coating, as a thermal spray coating or as another conversion coating.
  22. Process according to claim 21, the hard material coating being provided as a hard anodisation coating and the spray coating by flame spraying, plasma spraying, high speed flame spraying and/or detonation spraying.
  23. Process according to one of claims 1 to 22, the surface to be coated being the inside of a pan.
  24. Object comprising at least one surface region having a non-stick coating provided according to one of claims 1 to 23.
  25. Object according to claim 24, characterized in that it is provided as a household appliance, machine element, injection mould or casting mould.
EP95938434A 1995-11-08 1995-11-08 Process for producing a non-stick coating and objects provided with such a coating Expired - Lifetime EP0839216B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1995/004390 WO1997017478A1 (en) 1995-11-08 1995-11-08 Process for producing a non-stick coating and objects provided with such a coating

Publications (2)

Publication Number Publication Date
EP0839216A1 EP0839216A1 (en) 1998-05-06
EP0839216B1 true EP0839216B1 (en) 2000-03-08

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EP95938434A Expired - Lifetime EP0839216B1 (en) 1995-11-08 1995-11-08 Process for producing a non-stick coating and objects provided with such a coating

Country Status (5)

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EP (1) EP0839216B1 (en)
AT (1) ATE190362T1 (en)
DE (1) DE59507977D1 (en)
DK (1) DK0839216T3 (en)
WO (1) WO1997017478A1 (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO2008090192A1 (en) * 2007-01-24 2008-07-31 Thyssenkrupp Nirosta Gmbh Casting roller for a two-roller casting device, and two-roller casting device
DE10248118B4 (en) * 2002-10-10 2011-07-21 Süddeutsche Aluminium Manufaktur GmbH, 89558 Method for applying a thin-ceramic coating material to a surface to be coated of a motor vehicle attachment and motor vehicle attachment
CN102677119A (en) * 2012-05-29 2012-09-19 哈尔滨工业大学 Preparation method of aluminum alloy non-stick pan coating

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EP1042078A1 (en) * 1997-12-22 2000-10-11 E.I. Du Pont De Nemours And Company Process for sealing coatings
IL150397A0 (en) * 2000-01-14 2002-12-01 Astrazeneca Ab A method for applying a polymer coating to the internal surface of a container
DE10014486C2 (en) * 2000-03-23 2003-06-12 Dieter Kampmeier Process for applying a non-stick layer
DE10239359A1 (en) * 2002-08-24 2004-02-26 Kämpfer, Hans-Peter Hydrocyclone separator for removing oil from an oil-water-sand mixture produced during offshore oil recovery comprises single hydrocyclones provided with layer made from high sliding high wear resistant plastic
FR2897251B1 (en) * 2006-02-14 2013-07-12 Seb Sa ANODIZED CULINARY ARTICLE AND METHOD OF MANUFACTURING SUCH ARTICLE
GB2481562A (en) * 2009-04-15 2011-12-28 Octi Tech Ltd Llc Ceramic article imaging process and materials
JP6234754B2 (en) * 2013-09-18 2017-11-22 株式会社神戸製鋼所 Electrode metal plate and electrode
DE102016221023A1 (en) 2016-10-26 2018-04-26 MTU Aero Engines AG PROCESS FOR COATING THROUGH THERMAL SPRAYING AND PREPARATION OF A SURFACE THEREFOR BY ELECTROCHEMICAL OR CHEMICAL ETCHING OR LASER MATERIAL PROCESSING

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DE3712684A1 (en) * 1987-04-14 1988-10-27 Castolin Sa METHOD FOR PRODUCING A SPRAYED SURFACE WITH DEFINED ROUGHNESS, AND USE THEREOF
JPS63259062A (en) * 1987-04-15 1988-10-26 Eguro Tekkosho:Kk Ceramic coating method by thermal spraying
CH692481A5 (en) * 1988-10-21 2002-07-15 Hort Revetements S A A method of applying a fluoropolymer layer onto a surface of an object and object coated by the process.
TW214570B (en) * 1989-06-30 1993-10-11 Eltech Systems Corp
US5314601A (en) * 1989-06-30 1994-05-24 Eltech Systems Corporation Electrodes of improved service life
TW197475B (en) * 1990-12-26 1993-01-01 Eltech Systems Corp
DE4113211A1 (en) * 1991-04-23 1992-10-29 Winfried Heinzel METHOD FOR COATING HOUSEHOLD AND KITCHEN EQUIPMENT
GB9222275D0 (en) * 1992-10-23 1992-12-09 Meyer Manuf Co Ltd Cookware and a method of forming same
US5411771A (en) * 1993-04-29 1995-05-02 Tsai; Tung-Hung Method for coating metal cookware
DE4323117C1 (en) * 1993-07-10 1995-03-09 Ptg Plasma Oberflaechentech Process for coating household and kitchen equipment and household and kitchen equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10248118B4 (en) * 2002-10-10 2011-07-21 Süddeutsche Aluminium Manufaktur GmbH, 89558 Method for applying a thin-ceramic coating material to a surface to be coated of a motor vehicle attachment and motor vehicle attachment
WO2008090192A1 (en) * 2007-01-24 2008-07-31 Thyssenkrupp Nirosta Gmbh Casting roller for a two-roller casting device, and two-roller casting device
CN102677119A (en) * 2012-05-29 2012-09-19 哈尔滨工业大学 Preparation method of aluminum alloy non-stick pan coating

Also Published As

Publication number Publication date
WO1997017478A1 (en) 1997-05-15
ATE190362T1 (en) 2000-03-15
DE59507977D1 (en) 2000-04-13
DK0839216T3 (en) 2000-08-21
EP0839216A1 (en) 1998-05-06

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