EP0670190B1 - Foundry mould and process for making it - Google Patents
Foundry mould and process for making it Download PDFInfo
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- EP0670190B1 EP0670190B1 EP95400426A EP95400426A EP0670190B1 EP 0670190 B1 EP0670190 B1 EP 0670190B1 EP 95400426 A EP95400426 A EP 95400426A EP 95400426 A EP95400426 A EP 95400426A EP 0670190 B1 EP0670190 B1 EP 0670190B1
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- European Patent Office
- Prior art keywords
- substrate
- mold
- coating
- keying
- layer
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Definitions
- the present invention relates to a mold for foundry for aluminum alloys, as well as a process for its realization.
- This refractory layer has several functions.
- this refractory lining protects the shell and thus prevents its premature destruction.
- this coating constitutes a interface between the mold and the liquid alloy, which minimizes interactions.
- such a coating ensures certain thermal exchanges and participates in the control of the directed solidification.
- the document EP A 0 212 157 describes a foundry mold for the production of grids of lead, comprising a metal substrate coated with a protective layer, said layer having a ceramic refractory lining, as well as a bonding underlayment to base of a chromium, cobalt or nickel alloy, interposed between the coating ceramic refractory and metal substrate.
- a mold of Foundry for aluminum alloys is subject to strong thermal differences. Before the casting operation it is heated by burners of so as to be kept at a temperature of the order of 350 ° C. Then, the alloy is poured into it at a temperature which is around 680 ° C in the case of alloys aluminum. Mold wall temperatures therefore vary between 350 ° C and 680 ° C each time a part is cast, the rates of casting being able to hit the rhythm of one pour every five minutes. These thermal differences between the substrate and its coating induce differences in expansion which, by their repetition, destroy said coating.
- the invention provides a foundry mold for aluminum alloys comprising a metal substrate coated with a protective layer, said layer having a coating of a refractory material inert with respect to the cast metal, as well a bonding sub-layer interposed between the coating and the substrate, characterized in that the coating is made of a material chosen from the group comprising mullite, yttrium oxide and MgO-Al 2 O 3 mixtures , such as spinel, and in that the bonding layer is made of an alloy of nickel, chromium, aluminum and yttrium.
- the mold 1 shown in this figure includes a substrate 2, as well as a coating 3. Between the substrate 2 and the coating 3 is interposed a layer intermediate 4.
- the substrate 2 is for example made of steel Z38CDV05, this steel being conventionally used for making foundry molds with good resistance to thermal shock.
- the material of the refractory lining 3 is chosen for its insulating, refractory and inert qualities vis-à-vis cast alloys. It thus resists chemical aggressiveness of cast alloys and allows avoid tinning.
- the intermediate layer 4 constitutes, for the refractory lining 3, a bonding sub-layer. It is made of a material which is chosen so that said refractory lining 3 does not deteriorate during molding cycles, by difference in expansion thermal with substrate 2.
- This bonding underlayer 4 is made of an alloy by Ni Cr Al Y (Nickel Chrome Aluminum Yttrium), by example with the following weight percentages: 67% Ni, 22% Cr, 10% W Al, 1% Y and has a coefficient of thermal expansion close to that of substrate 2 and allowing good attachment of the coating 3 refractory.
- the thermal coefficients of expansion of the steel of the substrate 2 and of the various constituents mentioned above for the sub-layer 4 and the coating 3, are the following: (in m / mK) Z38CDV5 between 12.6 and 13.2.10 -6 Mullite 5.10 -6 Al 2 O 3 8.10 -6 MgO 12 to 16.10 -6 Spinel 8.3.10 -6 Y 2 O 3 8.10 -6 Ni Cr Al Y 15.2.10 -6 (in the above composition)
- the thickness of the underlay 4 of Ni Cr Al Y alloy can be included between 0.02 and 0.2 mm, that of the coating 3 between 0.01 and 0.11 mm when in alumina-magnesia and in particular between 0.01 and 0.03 mm when it is spinel.
- Cohesion, roughness, hardness of the layer protective thus produced by the coating 3 and the undercoat 4 are such that we do not observe degradation of the mold surface compared to that observed on a poteyé mold in a traditional way. The best results are obtained with coatings 3 of spinel.
- the corundumization operation is carried out by means of a numerically controlled machine.
- Surface condition obtained for the parts to be coated, in particular their roughness, is very precisely controlled by playing on the distance between the corundumization nozzle and the part to to cover, as well as the angle of incidence according to which the corundum particles are projected onto the part.
- This preparation is preferably carried out just before the deposition of the sublayer 4 hooking and refractory lining 3, so as not to not give the coated part time to oxidize or get polluted.
- the operations of deposition are carried out by thermal spraying by torch plasma.
- the plasma torch is manipulated by a robot and controlled by a programmable controller, which allows repeatability of operations.
- the deposit can also be carried out using an oxy-acetylene torch.
- the material to deposit is placed on the substrate 2 in the form of a bead or powder, said substrate 2 being brought to high temperature (around or above 600 ° C), so as to promote the chemical bonds between the underlay attachment 4 and the substrate 2.
- the deposits of the undercoat 4 for hanging and covering 3 can be produced by the plasma torch on a substrate 2 brought to high temperature (around or above 600 ° C).
- the invention has been described for the foundry of aluminum alloys in gravity shell. She of course applies generally to any molding in shell, and in particular in shell molding under high pressure or under low pressure.
- An advantageous application of the invention is the manufacture of parts for motor vehicles.
Description
La présente invention est relative à un moule de fonderie pour alliages d'aluminium, ainsi qu'à un procédé pour sa réalisation.The present invention relates to a mold for foundry for aluminum alloys, as well as a process for its realization.
Le moulage en coquille (c'est à dire au moyen d'un moule métallique) constitue un procédé éprouvé et au point sur le plan technologique, notamment pour le moulage d'alliages d'aluminium-silicium.Shell molding (i.e. by means of a metal mold) is a proven and technologically, especially for the casting of aluminum-silicon alloys.
Classiquement, pour protéger les parois du moule des interactions entre, d'une part, l'alliage liquide et, d'autre part, l'acier ou la fonte qui constituent le moule, on revêt lesdites parois d'une couche de matériau réfractaire.Conventionally, to protect the walls of the mold interactions between, on the one hand, the liquid alloy and, on the other hand, the steel or cast iron which constitute the mold, coating said walls with a layer of material refractory.
Ce revêtement est habituellement réalisé par « poteyage », c'est-à-dire par dépôt (au pinceau ou en utilisant un pistolet de projection) d'une suspension en solution, le moule ainsi revêtu étant ensuite étuvé aux alentours de 300°C pour évacuer les solvants.This coating is usually carried out by "Poteyage", that is to say by deposition (with a brush or using a spray gun) of a suspension in solution, the mold thus coated then being steamed with around 300 ° C to evacuate the solvents.
Cette couche réfractaire a plusieurs fonctions.This refractory layer has several functions.
Elle permet d'éviter l'étamage, c'est-à-dire le collage de l'alliage liquide sur les parois du moule.It avoids tinning, i.e. bonding of the liquid alloy on the walls of the mold.
Elle assure la lubrification du moule et permet de réduire les défauts de surface de celui-ci (rugosité trop importante, entailles, criques, joints d'assemblage, etc.).It provides lubrication of the mold and allows reduce its surface defects (roughness too large, nicks, cracks, joints assembly, etc.).
En outre, de par sa « friabilité », elle facilite le démoulage : quelques grains à la surface du moule sont arrachés à chaque extraction de pièce coulée, sans pour autant altérer notablement cette surface.In addition, because of its "friability", it facilitates demoulding: a few grains on the surface of the mold are torn off each time a casting is removed, without however significantly alter this surface.
Egalement, ce revêtement réfractaire protège la coquille et évite ainsi sa destruction prématurée.Also, this refractory lining protects the shell and thus prevents its premature destruction.
En particulier, ce revêtement constitue une interface entre le moule et l'alliage liquide, qui minimise les interactions.In particular, this coating constitutes a interface between the mold and the liquid alloy, which minimizes interactions.
Il constitue également une barrière thermique qui abaisse la température maximale atteinte à la surface de la coquille et prolonge ainsi la durée de vie du moule.It also constitutes a thermal barrier which lowers the maximum temperature reached on the surface of the shell and thus prolongs the life of the mold.
En outre, un tel revêtement assure certains échanges thermiques et participe à la maítrise de la solidification dirigée.In addition, such a coating ensures certain thermal exchanges and participates in the control of the directed solidification.
Cependant, la cohésion et la rugosité des revêtements réalisés par poteyage sont telles que ces revêtements se détruisent progressivement lors des cycles de fabrication des pièces de fonderie.However, the cohesion and roughness of coatings made by poteyage are such that these coatings are gradually destroyed during cycles for manufacturing foundry parts.
La technique de poteyage est de ce fait coûteuse. Elle nécessite en particulier l'immobilisation et le démontage réguliers des moules. Le poteyage a donc une incidence non négligeable sur le prix de revient des pièces.The poteyage technique is therefore expensive. In particular, it requires immobilization and regular disassembly of the molds. So poteyage has a significant impact on the cost price of rooms.
Un but de l'invention est donc de proposer un moule de fonderie pour alliages d'aluminium qui présente un revêtement réfractaire permanent, c'est-à-dire dont la durée de vie est augmentée de façon substantielle par rapport à celle des revêtements obtenus par poteyage.An object of the invention is therefore to propose a foundry mold for aluminum alloys which has a refractory coating permanent, i.e. with a longer service life substantially compared to that of coatings obtained by poteyage.
Il a déjà été proposé de remplacer les revêtements classiquement réalisés par poteyage par des couches de protection à base de Y2O3. On pourra avantageusement se référer à cet égard à la demande de brevet EP 252 862.It has already been proposed to replace the coatings conventionally produced by coating with protective layers based on Y 2 O 3 . Advantageously, reference may be made in this respect to patent application EP 252 862.
Ces couches de protection sont déposées directement sur l'acier du moule et s'avèrent d'une tenue dans le temps peu satisfaisante. Elles se détériorent rapidement du fait de la différence importante entre leur coefficient de dilatation thermique et celui du substrat sur lequel elles sont déposées.These protective layers are deposited directly on the mold steel and turn out to be unsatisfactory over time. They deteriorate quickly because of the significant difference between their coefficient of thermal expansion and that of the substrate on which they are deposited.
Le document EP A 0 212 157 décrit un moule de fonderie pour la réalisation de grilles de plomb, comportant un substrat métallique revêtu d'une couche protectrice, ladite couche présentant un revêtement réfractaire céramique, ainsi qu'une sous-couche d'accrochage à base d'un alliage de chrome, de cobalt ou de nickel, interposée entre le revêtement réfractaire céramique et le substrat métallique.The document EP A 0 212 157 describes a foundry mold for the production of grids of lead, comprising a metal substrate coated with a protective layer, said layer having a ceramic refractory lining, as well as a bonding underlayment to base of a chromium, cobalt or nickel alloy, interposed between the coating ceramic refractory and metal substrate.
Lors d'un cycle de moulage un moule de fonderie pour alliages d'aluminium est soumis à de forts écarts thermiques. Avant l'opération de coulée, il est chauffé par des brûleurs de façon à être maintenu à une température de l'ordre de 350°C. Puis, l'alliage y est coulé à une température qui est de l'ordre de 680°C dans le cas des alliages d'aluminium. Les températures des parois du moule varient donc entre 350°C et 680°C à chaque fois qu'une pièce est coulée, les cadences de coulée pouvant atteindre le rythme d'une coulée toutes les cinq minutes. Ces écarts thermiques entre le substrat et son revêtement induisent des différences de dilatation qui, par leur répétition, détruisent ledit revêtement.During a molding cycle a mold of Foundry for aluminum alloys is subject to strong thermal differences. Before the casting operation it is heated by burners of so as to be kept at a temperature of the order of 350 ° C. Then, the alloy is poured into it at a temperature which is around 680 ° C in the case of alloys aluminum. Mold wall temperatures therefore vary between 350 ° C and 680 ° C each time a part is cast, the rates of casting being able to hit the rhythm of one pour every five minutes. These thermal differences between the substrate and its coating induce differences in expansion which, by their repetition, destroy said coating.
Pour résoudre ce problème technique, l'invention propose un moule de fonderie pour alliages d'aluminium comportant un substrat métallique revêtu d'une couche protectrice, ladite couche présentant un revêtement en un matériau réfractaire inerte vis-à-vis du métal coulé, ainsi qu'une sous-couche d'accrochage interposée entre le revêtement et le substrat, caractérisé en ce que le revêtement est en un matériau choisi dans le groupe comprenant la mullite, l'oxyde d'yttrium et les mélanges MgO-Al2O3, tels que la spinelle, et en ce que la couche d'accrochage est en un alliage de nickel, de chrome, d'aluminium et d'yttrium.To solve this technical problem, the invention provides a foundry mold for aluminum alloys comprising a metal substrate coated with a protective layer, said layer having a coating of a refractory material inert with respect to the cast metal, as well a bonding sub-layer interposed between the coating and the substrate, characterized in that the coating is made of a material chosen from the group comprising mullite, yttrium oxide and MgO-Al 2 O 3 mixtures , such as spinel, and in that the bonding layer is made of an alloy of nickel, chromium, aluminum and yttrium.
L'invention propose également un procédé pour sa réalisation.The invention also provides a method for its production.
D'autres caractéristiques et avantages de l'invention ressortiront encore de la description qui suit. Cette description est purement illustrative et non limitative. Elle doit être lue en regard de la figure unique annexée (figure 1) sur laquelle on a représenté schématiquement, en vue en coupe, un détail avec arraché d'un moule conforme à l'invention.Other features and benefits of the invention will become more apparent from the description which follows. This description is purely illustrative and not limiting. It should be read opposite the figure single annexed (figure 1) on which is represented schematically, in sectional view, a detail with cutaway of a mold according to the invention.
Le moule 1 représenté sur cette figure comporte un
substrat 2, ainsi qu'un revêtement 3. Entre le substrat
2 et le revêtement 3 est interposée une couche
intermédiaire 4.The
Le substrat 2 est par exemple réalisé en acier
Z38CDV05, cet acier étant utilisé classiquement pour
réaliser les moules de fonderie et présentant une bonne
résistance aux chocs thermiques. The
Le matériau du revêtement 3 réfractaire est choisi
pour ses qualités isolantes, réfractaires, et inertes
vis-à-vis des alliages coulés. Il résiste ainsi à
l'agressivité chimique des alliages coulés et permet
d'éviter l'étamage.The material of the
Le revêtement 3 est réalisé en un matériau choisi dans le groupe comprenant :
- l'oxyde d'yttrium Y2O3,
- la mullite, de composition 3Al2O3 - 2SiO2 ,
- les mélanges MgO - Al2O3, et parmi ceux-ci plus particulièrement la spinelle de composition Mg Al2O4.
- yttrium oxide Y 2 O 3 ,
- mullite, of composition 3Al 2 O 3 - 2SiO 2 ,
- MgO - Al 2 O 3 mixtures, and among these more particularly the spinel of composition Mg Al 2 O 4 .
La couche 4 intermédiaire constitue, pour le
revêtement 3 réfractaire, une sous-couche d'accrochage.
Elle est en un matériau qui est choisi de façon que
ledit revêtement 3 réfractaire ne se détériore pas lors
des cycles de moulage, par différence de dilatation
thermique avec le substrat 2.The intermediate layer 4 constitutes, for the
Cette sous-couche 4 d'accrochage est en un alliage
de Ni Cr Al Y (Nickel Chrome Aluminium Yttrium), par
exemple avec les pourcentages pondéraux suivants: 67 %
Ni, 22 % Cr, 10 % W Al, 1 % Y et a un coefficient de
dilatation thermique voisin de celui du substrat 2 et
permettant un bon accrochage du revêtement 3
réfractaire.This bonding underlayer 4 is made of an alloy
by Ni Cr Al Y (Nickel Chrome Aluminum Yttrium), by
example with the following weight percentages: 67%
Ni, 22% Cr, 10% W Al, 1% Y and has a coefficient of
thermal expansion close to that of
Les coefficients thermiques de dilatation de
l'acier du substrat 2 et des différents constituants
cités ci-dessus pour la sous-couche 4 et le revêtement
3, sont les suivants : (en m/mK)
A titre d'exemple non limitatif, l'épaisseur de la
sous-couche 4 en alliage Ni Cr Al Y peut être comprise
entre 0,02 et 0,2 mm, celle du revêtement 3 entre 0,01 et
0,11 mm lorsqu'il est en alumine-magnésie et notamment
entre 0,01 et 0,03 mm lorsqu'il est en spinelle.By way of nonlimiting example, the thickness of the
underlay 4 of Ni Cr Al Y alloy can be included
between 0.02 and 0.2 mm, that of the
La cohésion, la rugosité, la dureté de la couche
protectrice ainsi réalisée par le revêtement 3 et la sous-couche
d'accrochage 4 sont telles que l'on n'observe pas
de dégradation de la surface du moule comparée à celle
observée sur un moule poteyé de manière traditionnelle.
Les meilleurs résultats sont obtenus avec des revêtements
3 de spinelle.Cohesion, roughness, hardness of the layer
protective thus produced by the
On notera que la bonne résistance du revêtement 3
vis-à-vis des alliages d'aluminium permet d'envisager
d'utiliser des aciers de moins bonne qualité que l'acier
Z38CDV05 pour réaliser le substrat 2 du moule 1.Note that the good resistance of the
Le procédé selon l'invention pour la réalisation
d'un moule 1 du type de celui qui vient d'être décrit
comprend la succession d'étapes suivantes:
Une préparation très méticuleuse du substrat 2 est
nécessaire pour éliminer de la surface de celui-ci une
éventuelle couche d'oxyde et créer des rugosités
favorisant l'adhérence de la sous-couche 4 d'accrochage.
Cette préparation de la surface à revêtir consiste
avantageusement en un corindonage, c'est-à-dire en une
projection (grenaillage) de corindon (alumine
cristallisée), sur la surface du substrat 2.A very meticulous preparation of
L'opération de corindonage est réalisée au moyen d'une machine à commande numérique. L'état de surface obtenu pour les pièces à revêtir, en particulier leur rugosité, est maítrisé de façon trés précise en jouant sur la distance entre la buse de corindonage et la pièce à revêtir, ainsi que sur l'angle d'incidence suivant lequel les particules de corindon sont projetées sur la pièce.The corundumization operation is carried out by means of a numerically controlled machine. Surface condition obtained for the parts to be coated, in particular their roughness, is very precisely controlled by playing on the distance between the corundumization nozzle and the part to to cover, as well as the angle of incidence according to which the corundum particles are projected onto the part.
La qualité de cette préparation est primordiale
pour le procédé conforme à l'invention, puisqu'elle
conditionne l'accrochage mécanique des dépôts sur le
substrat 2.The quality of this preparation is essential
for the process according to the invention, since it
conditions the mechanical attachment of deposits on the
Cette préparation est préférentiellement réalisée
juste avant les opérations de dépôt de la sous-couche 4
d'accrochage et du revêtement 3 réfractaire, afin de ne
pas donner à la pièce revêtue le temps de s'oxyder ou de
se polluer.This preparation is preferably carried out
just before the deposition of the sublayer 4
hooking and
Selon un mode de mise en oeuvre possible avantageux du procédé de l'invention, les opérations de dépôt sont réalisées par projection thermique par torche plasma.According to a possible mode of implementation advantageous of the process of the invention, the operations of deposition are carried out by thermal spraying by torch plasma.
La torche plasma est manipulée par un robot et pilotée par un automate programmable, ce qui permet la répétitivité des opérations.The plasma torch is manipulated by a robot and controlled by a programmable controller, which allows repeatability of operations.
En variante, le dépôt peut également être réalisé
en utilisant un chalumeau oxy-acétylénique. La matière à
déposer est placée sur le substrat 2 sous forme de cordon
ou de poudre, ledit substrat 2 étant porté à haute
température (de l'ordre de ou supérieure à 600°C), de
façon à favoriser les liaisons chimiques entre la sous-couche
d'accrochage 4 et le substrat 2.As a variant, the deposit can also be carried out
using an oxy-acetylene torch. The material to
deposit is placed on the
Le même soin doit être apporté à la préparation du
substrat 2 par corindonage, les opérations de dépôt étant
également réalisées rapidement après la préparation dudit
substrat 2. The same care must be taken in the preparation of the
Les résultats les plus probants ont été obtenus avec la torche plasma.The most convincing results were obtained with the plasma torch.
En variante encore, les dépôts de la sous-couche
4 d'accrochage et du revêtement 3 peuvent être
réalisés par la torche plasma sur un substrat 2 porté à
haute température (de l'ordre de ou supérieure à 600°C).In another variant, the deposits of the undercoat
4 for hanging and covering 3 can be
produced by the plasma torch on a
L'invention permet :
- des gains substantiels au niveau du coût de fabrication des pièces produites en aluminium coulées en coquille ;
- une dotation moins importante en nombre de moules pour assurer la production d'une pièce donnée du fait de la suppression du poteyage (aujourd'hui : 8 moules en fabrication, pour 2 moules en poteyage), ce qui se traduit par une réduction des investissements pour fabriquer les pièces de fonderie ;
- une diminution de la masse des pièces produites du fait de la réduction possible des dépouilles nécessaires à l'extraction de la pièce du moule, les moules poteyés nécessitant quant à eux des dépouilles importantes de façon à éviter la dégradation rapide du poteyage à chaque démoulage de pièce ;
- l'utilisation de matériaux moins chers que ceux utilisés actuellement pour réaliser des parties de moules du fait de la résistance des dépôts.
- substantial savings in the cost of manufacturing parts produced from cast aluminum;
- a lower endowment in number of molds to ensure the production of a given part due to the elimination of poteyage (today: 8 molds in production, for 2 molds in poteyage), which translates into a reduction in investments to manufacture foundry parts;
- a reduction in the mass of the parts produced due to the possible reduction of the spoils necessary for the extraction of the part from the mold, the poteyé molds requiring large spoils in order to avoid rapid degradation of the poteyage with each release from the mold room ;
- the use of less expensive materials than those currently used to produce parts of molds due to the resistance of the deposits.
L'invention a été décrite pour la fonderie des alliages d'aluminium en coquille par gravité. Elle s'applique bien entendu de façon générale à tout moulage en coquille, et notamment au moulage en coquille sous haute pression ou sous basse pression. The invention has been described for the foundry of aluminum alloys in gravity shell. She of course applies generally to any molding in shell, and in particular in shell molding under high pressure or under low pressure.
Une application avantageuse de l'invention est la fabrication de pièces pour véhicules automobiles.An advantageous application of the invention is the manufacture of parts for motor vehicles.
Claims (11)
- A foundry mold for aluminum alloys, the mold comprising a metal substrate (2) coated in a protective layer (3, 4), said layer presenting a coating (3) of refractory material that is inert to the cast metal, and a keying sublayer (4) interposed between the coating (3) and the substrate (2), said coating (3) being of a material selected from the group comprising: mullite, yttrium oxide, and MgO-Al2O3 mixtures such as spinel, and the mold being characterized in that the keying layer is an alloy of nickel, chromium, aluminum, and yttrium.
- A foundry mode according to claim 1, characterized in that said alloy has the following composition by weight: 67% nickel, 22% chromium, 10% aluminum, and 1% yttrium.
- A method of making a mold (1) according to claim 1 or 2, characterized in that it comprises the following steps:a) preparing the surface of the metal substrate (2);b) depositing the keying sublayer (4); andc) depositing the coating (3).
- A method according to claim 3, characterized in that step a) consists in eliminating any oxide layer from the surface of the substrate (2) and in creating roughnesses that facilitate deposition of the keying sublayer (4).
- A method according to claim 4, characterized in that step a) comprises an operation of shot blasting the surface of the substrate (2) with particles of corundum.
- A method according to any one of claims 3 to 5, characterized in that steps b) and c) are performed sufficiently soon after step a) to ensure that the substrate (2) does not have time to oxidize.
- A method according to any one of claims 3 to 6, characterized in that step b) and/or step c) are performed by means of a plasma torch device.
- A method according to claim 7, characterized in that the torch is mounted on a robot and controlled by a programmable controller so as to obtain repeatable deposits.
- A method according to any one of claims 3 to 8, characterized in that it comprises an additional step d) performed after step a) and before step b), said step consisting in heating the substrate (2) to a temperature that is high enough to enhance chemical bonding between the substrate (2) and the keying underlayer (4).
- A method according to claim 9, characterized in that said temperature is greater than or equal to 600°C.
- A method according to any one of claims 3 to 10, characterized in that step b) and/or step c) are performed by means of a device such as an oxyacetylene torch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9402327A FR2716898B1 (en) | 1994-03-01 | 1994-03-01 | Piece, such as a foundry mold, and its production process. |
| FR9402327 | 1994-03-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0670190A1 EP0670190A1 (en) | 1995-09-06 |
| EP0670190B1 true EP0670190B1 (en) | 2000-05-03 |
Family
ID=9460539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95400426A Expired - Lifetime EP0670190B1 (en) | 1994-03-01 | 1995-02-28 | Foundry mould and process for making it |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0670190B1 (en) |
| DE (1) | DE69516566T2 (en) |
| ES (1) | ES2146294T3 (en) |
| FR (1) | FR2716898B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456061B (en) * | 2007-12-10 | 2010-08-11 | 洛阳双瑞精铸钛业有限公司 | Auxiliary technique capable of increasing graphite mould titanium alloy casting quality |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2736850B1 (en) * | 1995-07-19 | 1997-10-10 | Peugeot | FOUNDRY MOLD AND METHOD OF MAKING SUCH A MOLD |
| FR2850891B1 (en) * | 2003-02-06 | 2006-08-04 | Acierie Et Fonderie De La Haut | METHOD OF PROTECTING TOOLS IN CONTACT WITH FUSION METALS AND GLASSES |
| ITMO20050131A1 (en) * | 2005-05-27 | 2006-11-28 | T W R Sas Di Mario Doda E C | MOLD FOR FORMING CERAMIC ARTICLES. |
| DE102009009559B4 (en) | 2009-02-19 | 2022-02-17 | Ceranovis Gmbh | Process for extending the service life of technical surfaces |
| CN110408880A (en) * | 2019-09-02 | 2019-11-05 | 中国科学院金属研究所 | A kind of atmospheric plasma spraying technology preparation Y+Y2O3/Y2O3The method of composite coating |
| CN117512492B (en) * | 2024-01-04 | 2024-04-16 | 北矿新材科技有限公司 | Micropore dispersion type high-temperature abradable seal coating and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0212157A2 (en) * | 1985-08-20 | 1987-03-04 | VARTA Batterie Aktiengesellschaft | Device for casting lead grids for electric storage plates and method for producing the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63153256A (en) * | 1986-12-17 | 1988-06-25 | Honda Motor Co Ltd | Coating method for copper-mold surface |
| US4900640A (en) * | 1988-04-19 | 1990-02-13 | Inco Limited | Low coefficient of expansion alloys having a thermal barrier |
| JP2695835B2 (en) * | 1988-05-06 | 1998-01-14 | 株式会社日立製作所 | Ceramic coated heat resistant material |
| US5034284A (en) * | 1990-05-10 | 1991-07-23 | United Technologies Corporation | Thermal fatigue resistant coatings |
| JP3066812B2 (en) * | 1991-10-09 | 2000-07-17 | 黒崎播磨株式会社 | Low melting metal casting tool with two or more coatings |
-
1994
- 1994-03-01 FR FR9402327A patent/FR2716898B1/en not_active Expired - Fee Related
-
1995
- 1995-02-28 ES ES95400426T patent/ES2146294T3/en not_active Expired - Lifetime
- 1995-02-28 EP EP95400426A patent/EP0670190B1/en not_active Expired - Lifetime
- 1995-02-28 DE DE1995616566 patent/DE69516566T2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0212157A2 (en) * | 1985-08-20 | 1987-03-04 | VARTA Batterie Aktiengesellschaft | Device for casting lead grids for electric storage plates and method for producing the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456061B (en) * | 2007-12-10 | 2010-08-11 | 洛阳双瑞精铸钛业有限公司 | Auxiliary technique capable of increasing graphite mould titanium alloy casting quality |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2716898B1 (en) | 1996-06-07 |
| EP0670190A1 (en) | 1995-09-06 |
| DE69516566T2 (en) | 2001-02-08 |
| FR2716898A1 (en) | 1995-09-08 |
| DE69516566D1 (en) | 2000-06-08 |
| ES2146294T3 (en) | 2000-08-01 |
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