EP0670190A1 - Giessform und Verfahren zu seiner Herstellung - Google Patents

Giessform und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0670190A1
EP0670190A1 EP95400426A EP95400426A EP0670190A1 EP 0670190 A1 EP0670190 A1 EP 0670190A1 EP 95400426 A EP95400426 A EP 95400426A EP 95400426 A EP95400426 A EP 95400426A EP 0670190 A1 EP0670190 A1 EP 0670190A1
Authority
EP
European Patent Office
Prior art keywords
substrate
layer
coating
mold
carried out
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.)
Granted
Application number
EP95400426A
Other languages
English (en)
French (fr)
Other versions
EP0670190B1 (de
Inventor
Eric Lenoir
Philippe Azemar
José Kopniaeff
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0670190A1 publication Critical patent/EP0670190A1/de
Application granted granted Critical
Publication of EP0670190B1 publication Critical patent/EP0670190B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • 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 foundry mold, as well as to a process for its production.
  • Shell molding (ie using a metal mold) is a proven and technologically advanced process, especially for the molding of aluminum-silicon alloys.
  • This coating is usually carried out by “poteyage”, that is to say by depositing (with a brush or using a spray gun) a suspension in solution, the mold thus coated is then steamed at around 300 ° C. to remove the solvents.
  • This refractory layer has several functions.
  • this refractory coating protects the shell and thus prevents its premature destruction.
  • this coating constitutes an interface between the mold and the liquid alloy, which minimizes the interactions.
  • such a coating ensures certain heat exchanges and participates in the control of directed solidification.
  • the poteyage technique is therefore expensive. It requires in particular the regular immobilization and disassembly of the molds.
  • the coating therefore has a significant impact on the cost price of the parts.
  • An object of the invention is therefore to propose a foundry mold which has a permanent refractory coating, that is to say one whose lifetime is increased substantially compared to that of the coatings obtained by coating.
  • a foundry mold is subjected to large thermal differences. Before the casting operation, it is heated by burners so as to be maintained at a temperature of the order of 350 ° C. Then, the alloy is poured into it at a temperature which is of the order of 680 ° C. in the case of the alloys aluminum.
  • the temperatures of the mold walls therefore vary between 350 ° C. and 680 ° C. each time a part is cast, the rates of casting being able to reach the rate of a casting every five minutes.
  • the invention provides a foundry mold 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 as a sub- bonding 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-Al2O3 mixtures, such as spinel, and that the bonding layer is made of an alloy of nickel, chromium, aluminum and yttrium.
  • the invention also proposes a method for its realization.
  • FIG. 1 In which a detail has been shown schematically, in section view, cut away from a mold according to the invention.
  • the mold 1 shown in this figure comprises a substrate 2, as well as a coating 3. Between the substrate 2 and the coating 3 is interposed an intermediate layer 4.
  • the substrate 2 is for example made of Z38CDVO5 steel, this steel being conventionally used for making foundry molds and having good resistance to thermal shock.
  • the material of the refractory lining 3 is chosen for its insulating, refractory and inert qualities with respect to cast alloys. It thus resists the chemical aggressiveness of cast alloys and avoids tinning.
  • the intermediate layer 4 constitutes, for the refractory lining 3, a bonding sublayer. It is made of a material which is chosen so that said refractory coating 3 does not deteriorate during the molding cycles, by difference in thermal expansion with the substrate 2.
  • a material having a coefficient of thermal expansion close to that of the substrate 2 and allowing good adhesion of the refractory lining 3 is chosen for the attachment sub-layer 4.
  • This bonding sublayer 4 is in a preferred embodiment made of an alloy of Ni Cr Al Y (Nickel Chrome Aluminum Yttrium), for example with the following weight percentages: 67% Ni, 22% Cr, 10% Al, 1% Y.
  • the thickness of the sublayer 4 of Ni Cr Al Y alloy can be between 0.02 and 0.2 mm, that of the coating 3 between 0.01 and 0.11 mm when 'it is in alumina-magnesia and in particular between 0.01 and 0.03 mm when it is in spinel.
  • the cohesion, roughness, hardness of the protective layer thus produced by the coating 3 and the bonding underlayer 4 are such that no degradation of the mold surface is observed compared to that observed on a poteyé mold in the traditional way.
  • the best results are obtained with 3 spinel coatings.
  • the good resistance of the coating 3 with respect to the aluminum alloys makes it possible to envisage using lower quality steels than the steel Z38CDV05 to produce the substrate 2 of the mold 1.
  • This preparation of the surface to be coated advantageously consists of a corundum, that is to say a projection (shot peening) of corundum (alumina crystallized), on the surface of the substrate 2.
  • the corundumization operation is carried out by means of a numerically controlled machine.
  • the surface condition obtained for the parts to be coated, in particular their roughness, is controlled very precisely by varying the distance between the corundumization nozzle and the part to be coated, 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 operations for depositing the bonding underlayer 4 and the refractory lining 3, so as not to give the coated part time to oxidize or to become polluted.
  • the deposition operations are carried out by thermal spraying with a plasma torch.
  • the plasma torch is manipulated by a robot and controlled by a programmable automaton, which allows repeatability of operations.
  • the deposition can also be carried out using an oxy-acetylene torch.
  • the material to be deposited is placed on the substrate 2 in the form of a bead or powder, said substrate 2 being brought to high temperature (of the order of or higher than 600 ° C.), so as to promote the chemical bonds between the sub -latching layer 4 and the substrate 2.
  • the deposits of the bonding sub-layer 4 and of the coating 3 can be produced by the plasma torch on a substrate 2 brought to high temperature (of the order of or greater than 600 ° C.).
  • the invention has been described for the foundry of aluminum alloys in gravity shells. It is of course generally applicable to any shell molding, without restriction as regards the cast alloy, and in particular to high pressure or low pressure shell molding.
  • An advantageous application of the invention is the manufacture of parts for motor vehicles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP95400426A 1994-03-01 1995-02-28 Giessform und Verfahren zu ihrer Herstellung Expired - Lifetime EP0670190B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9402327A FR2716898B1 (fr) 1994-03-01 1994-03-01 Pièce, telle qu'un moule de fonderie, et son procédé de réalisation.
FR9402327 1994-03-01

Publications (2)

Publication Number Publication Date
EP0670190A1 true EP0670190A1 (de) 1995-09-06
EP0670190B1 EP0670190B1 (de) 2000-05-03

Family

ID=9460539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400426A Expired - Lifetime EP0670190B1 (de) 1994-03-01 1995-02-28 Giessform und Verfahren zu ihrer Herstellung

Country Status (4)

Country Link
EP (1) EP0670190B1 (de)
DE (1) DE69516566T2 (de)
ES (1) ES2146294T3 (de)
FR (1) FR2716898B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754514A1 (de) * 1995-07-19 1997-01-22 Automobiles Peugeot Giessform und Verfahren zur deren Herstellung
FR2850891A1 (fr) * 2003-02-06 2004-08-13 Acierie Et Fonderie De La Haut Mode de protection des outils en contact avec les metaux et verres en fusion
EP1726421A2 (de) * 2005-05-27 2006-11-29 T.W.R. Sas Di Mario Doda & C. Formenmatrize zur Herstellung von Keramikgegenständen
CN117512492A (zh) * 2024-01-04 2024-02-06 北矿新材科技有限公司 微孔弥散型高温可磨耗封严涂层及其制备方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101456061B (zh) * 2007-12-10 2010-08-11 洛阳双瑞精铸钛业有限公司 一种提高石墨型钛合金铸件质量的辅助工艺
DE102009009559B4 (de) 2009-02-19 2022-02-17 Ceranovis Gmbh Verfahren zum Verlängern der Standzeit von technischen Oberflächen
CN110408880A (zh) * 2019-09-02 2019-11-05 中国科学院金属研究所 一种大气等离子喷涂技术制备y+y2o3/y2o3复合涂层的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63153256A (ja) * 1986-12-17 1988-06-25 Honda Motor Co Ltd 銅金型表面のコ−テイング方法
EP0338520A1 (de) * 1988-04-19 1989-10-25 Inco Limited Legierungen mit geringerem Ausdehnungskoeffizienten, beschichtet mit einer wärmedämmenden Schicht
EP0340791A2 (de) * 1988-05-06 1989-11-08 Hitachi, Ltd. Mit Keramik beschichteter hitzebeständiger Legierungsbestandteil
US5034284A (en) * 1990-05-10 1991-07-23 United Technologies Corporation Thermal fatigue resistant coatings
EP0536754A1 (de) * 1991-10-09 1993-04-14 Krosaki Corporation Vorrichtung mit mindestens zwei Schutzschichten zum Giessen von niedrigschmelzenden Metallen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212157B1 (de) * 1985-08-20 1990-02-07 VARTA Batterie Aktiengesellschaft Vorrichtung zum Giessen von Bleigittern für elektrische Akkumulatorenplatten und Verfahren zu ihrer Herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63153256A (ja) * 1986-12-17 1988-06-25 Honda Motor Co Ltd 銅金型表面のコ−テイング方法
EP0338520A1 (de) * 1988-04-19 1989-10-25 Inco Limited Legierungen mit geringerem Ausdehnungskoeffizienten, beschichtet mit einer wärmedämmenden Schicht
EP0340791A2 (de) * 1988-05-06 1989-11-08 Hitachi, Ltd. Mit Keramik beschichteter hitzebeständiger Legierungsbestandteil
US5034284A (en) * 1990-05-10 1991-07-23 United Technologies Corporation Thermal fatigue resistant coatings
EP0536754A1 (de) * 1991-10-09 1993-04-14 Krosaki Corporation Vorrichtung mit mindestens zwei Schutzschichten zum Giessen von niedrigschmelzenden Metallen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; AN 88-216977 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754514A1 (de) * 1995-07-19 1997-01-22 Automobiles Peugeot Giessform und Verfahren zur deren Herstellung
FR2736850A1 (fr) * 1995-07-19 1997-01-24 Peugeot Moule de fonderie et procede de realisation d'un tel moule
FR2850891A1 (fr) * 2003-02-06 2004-08-13 Acierie Et Fonderie De La Haut Mode de protection des outils en contact avec les metaux et verres en fusion
EP1726421A2 (de) * 2005-05-27 2006-11-29 T.W.R. Sas Di Mario Doda & C. Formenmatrize zur Herstellung von Keramikgegenständen
EP1726421A3 (de) * 2005-05-27 2008-11-05 T.W.R. Sas Di Mario Doda & C. Formenmatrize zur Herstellung von Keramikgegenständen
CN117512492A (zh) * 2024-01-04 2024-02-06 北矿新材科技有限公司 微孔弥散型高温可磨耗封严涂层及其制备方法
CN117512492B (zh) * 2024-01-04 2024-04-16 北矿新材科技有限公司 微孔弥散型高温可磨耗封严涂层及其制备方法

Also Published As

Publication number Publication date
ES2146294T3 (es) 2000-08-01
EP0670190B1 (de) 2000-05-03
DE69516566T2 (de) 2001-02-08
DE69516566D1 (de) 2000-06-08
FR2716898A1 (fr) 1995-09-08
FR2716898B1 (fr) 1996-06-07

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