EP0806258B1 - Neue isolierende Schicht für Metallform und Verfahren zur Herstellung einer solchen Schicht - Google Patents

Neue isolierende Schicht für Metallform und Verfahren zur Herstellung einer solchen Schicht Download PDF

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Publication number
EP0806258B1
EP0806258B1 EP19970401022 EP97401022A EP0806258B1 EP 0806258 B1 EP0806258 B1 EP 0806258B1 EP 19970401022 EP19970401022 EP 19970401022 EP 97401022 A EP97401022 A EP 97401022A EP 0806258 B1 EP0806258 B1 EP 0806258B1
Authority
EP
European Patent Office
Prior art keywords
coating
casting
metakaolin
metal
mould
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19970401022
Other languages
English (en)
French (fr)
Other versions
EP0806258A1 (de
Inventor
Frédéric Vanryssel
Philippe Jasson
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 EP0806258A1 publication Critical patent/EP0806258A1/de
Application granted granted Critical
Publication of EP0806258B1 publication Critical patent/EP0806258B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 invention relates to a new insulating coating for molds. metallic, intended in particular for the casting of ferrous metals.
  • the invention finds its application in the metallurgical industry, more especially in the manufacture of metal parts for industry automobile.
  • Document EP-A-0.014.055 describes a fibrous refractory product free of magnet formed by kneading of a composition comprising aluminosilicate fiber and kaolin-type clay, addition of water, shaping the mixture to form an article, drying the article and then baking the article to a temperature which transforms clay into the amorphous metakaolin phase.
  • a fibrous refractory product free of magnet formed by kneading of a composition comprising aluminosilicate fiber and kaolin-type clay, addition of water, shaping the mixture to form an article, drying the article and then baking the article to a temperature which transforms clay into the amorphous metakaolin phase.
  • Such a product can find application in deflectors, tanks or tubular elements.
  • Document US-A-4,600,437 describes an inorganic material comprising an alkaline salt of the acid silicic and metakaolin and exhibiting, after solidification, good water resistance properties, said material being able to be used as coating on a metal or an organic substance.
  • Document JP-A-7215772 describes a refractory material containing from 0.1 to 20% metakaolin in weight of a composition containing refractory magnesia in the raw state and its applications for coating steel fabrication containers.
  • metal parts for example cast iron
  • a poteyage which, while allowing a easy mold-part separation, is relatively conductive.
  • most typically used is carbon black from combustion incomplete acetylene. It is deposited at each casting operation by a burner set in reducing phase.
  • the metal mold is coated with a insulating coating, based on silica, in the form of a coating with single or multiple layer.
  • the silica products In practice, due to their low thermal conductivity, the silica products have great insulating power and are widely preferably used, especially since their cost is low and their significant availability.
  • This slip consists of a suspension of silica flour in water previously added with products likely to improve the rheological properties, in general of gelling agents, mineral or organic.
  • the metal mold is coated with a refractory layer uniform.
  • a known improvement in the prior art has therefore consisted in: make the coating in several layers, a first layer (or primary coating), applied directly to the mold surface and intended to remain there permanently, and a second layer (or secondary coating), applied to the previous layer and totally or partially renewed at each casting operation.
  • the invention therefore aims to eliminate any use of silica as an insulating coating for a metal mold, and to replace it a non-silicogenic refractory product having an insulating power sufficient.
  • an insulating coating for mold metal intended for the casting of ferrous metals, in particular by casting centrifugal, comprising at least one primary coating applied to the mold surface and intended to remain there permanently and secondary coating, applied to the primary coating and renewed totally or partially at each casting operation, is remarkable in that said secondary coating comprises metakaolin.
  • the secondary coating is often called in the literature maintenance coating.
  • metakaolin we mean in the remainder of this document, the material obtained from natural kaolin, which is previously purified in order to remove any trace of impurities of the quartz or mica type and which is calcined at a temperature between 750 and 950 ° C, so that completely eliminate the water of constitution.
  • the secondary coatings and primary consist essentially of metakaolin.
  • This product has the advantage of being refractory, due to its chemical constitution, to be inert, due to the absence of water from constitution, to be insulating, due to its particle size distribution and to be medically neutral, due to a free silica content of less than 0.5%.
  • the mold, thus coated, was used several times, for the casting of cast iron, in order to obtain metal parts, in particular for automobile industry.
  • the secondary coating after demolding the metal part, remains adherent in majority to said part, while a minority fraction remains adherent to the primary coating. Between each operation of casting, a new layer was applied by spraying reconstitute the secondary coating.
  • the primary coating strongly adhering to the shell, is remained in place permanently, after more than one hundred (100) casting operations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Claims (8)

  1. Verfahren zum Herstellen einer isolierenden Beschichtung für Metallformen zum Gießen eisenhaltiger Metalle, insbesondere anhand des Schleudergusses, wobei auf die Oberfläche der Form zumindest eine Grundbeschichtung aufgebracht wird, die dazu bestimmt ist, ständig auf der Form zu verbleiben, und wobei eine Deckbeschichtung auf der Grundbeschichtung aufgebracht wird, welche Deckbeschichtung bei jedem Gussvorgang komplett oder teilweise erneuert wird, dadurch gekennzeichnet, dass die Deckbeschichtung Metakaolin enthält.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Deckbeschichtung in der Hauptsache aus Metakaolin besteht.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Grundbeschichtung ebenfalls in der Hauptsache aus Metakaolin besteht.
  4. Verfahren zum Herstellen einer isolierenden Beschichtung für Metallformen nach Anspruch 3, dadurch gekennzeichnet, dass:
    a) man ein Metakaolinpulver ausgehend von Kaolin, das man reinigt, herstellt, und das man anschließend zwischen 750 und 950 °C während etwa 1 Stunde kalziniert;
    b) man ein Gemisch aus diesem Metakaolinpulver und Natriumsilikat herstellt, das in etwa die gleiche Granulometrie aufweist, und dass man dieses Gemisch auf die bloße und vorab erhitzte Oberfläche der Metallform zwischen 300 und 400 °C aufsprüht, so dass eine Grundbeschichtung mit einer Stärke entsteht, die im Allgemeinen zwischen 50 und 100 Mikron beträgt;
    c) man eine Suspension von Metakaolin in Wasser mit einer Gewichtskonzentration zwischen 25 und 35 % herstellt, die man dann auf die Grundbeschichtung sprüht, so dass eine Deckbeschichtung mit einer Stärke entsteht, die im Allgemeinen zwischen 50 und 100 Mikron beträgt.
  5. Metallform mit einer isolierenden Beschichtung, die man durch Anwenden eines der Ansprüche 1 bis 4 verwirklicht.
  6. Einsatz einer Metallform nach Anspruch 5 zum Gießen eisenhaltiger Metalle.
  7. Einsatz einer Metallform nach Anspruch 5 zum Herstellen von Metallteilen durch Gießen eisenhaltiger Metalle in diese Form.
  8. Einsatz einer Metallform nach Anspruch 5 zum Herstellen von Metallteilen, die für die Automobilindustrie bestimmt sind, und insbesondere von Teilen aus Guss mit perlitischem Rohgussgefüge.
EP19970401022 1996-05-10 1997-05-07 Neue isolierende Schicht für Metallform und Verfahren zur Herstellung einer solchen Schicht Expired - Lifetime EP0806258B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9605822 1996-05-10
FR9605822A FR2748409B1 (fr) 1996-05-10 1996-05-10 Nouveau revetement isolant pour moule metallique et procede de realisation d'un tel revetement

Publications (2)

Publication Number Publication Date
EP0806258A1 EP0806258A1 (de) 1997-11-12
EP0806258B1 true EP0806258B1 (de) 2003-03-19

Family

ID=9492006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970401022 Expired - Lifetime EP0806258B1 (de) 1996-05-10 1997-05-07 Neue isolierende Schicht für Metallform und Verfahren zur Herstellung einer solchen Schicht

Country Status (4)

Country Link
EP (1) EP0806258B1 (de)
DE (1) DE69719845T2 (de)
ES (1) ES2195095T3 (de)
FR (1) FR2748409B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004060649A1 (de) * 2004-12-16 2006-06-29 Ashland-Südchemie-Kernfest GmbH Hochisolierende und feuerfeste Beschichtungsmassen für Gießformen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4257812A (en) * 1979-01-17 1981-03-24 The Babcock & Wilcox Company Fibrous refractory products
US4600437A (en) * 1984-03-29 1986-07-15 Kabushiki Kaisha Toyota Chuo Kenkyusho Inorganic material, a process for producing same and a solidifying method thereof
JP2548085B2 (ja) * 1994-02-04 1996-10-30 東和耐火工業株式会社 不定形耐火物組成

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004060649A1 (de) * 2004-12-16 2006-06-29 Ashland-Südchemie-Kernfest GmbH Hochisolierende und feuerfeste Beschichtungsmassen für Gießformen

Also Published As

Publication number Publication date
DE69719845D1 (de) 2003-04-24
EP0806258A1 (de) 1997-11-12
FR2748409A1 (fr) 1997-11-14
ES2195095T3 (es) 2003-12-01
FR2748409B1 (fr) 1998-07-10
DE69719845T2 (de) 2003-11-13

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