EP0806258A1 - 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

Info

Publication number
EP0806258A1
EP0806258A1 EP97401022A EP97401022A EP0806258A1 EP 0806258 A1 EP0806258 A1 EP 0806258A1 EP 97401022 A EP97401022 A EP 97401022A EP 97401022 A EP97401022 A EP 97401022A EP 0806258 A1 EP0806258 A1 EP 0806258A1
Authority
EP
European Patent Office
Prior art keywords
coating
metal mold
casting
insulating coating
metakaolin
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
EP97401022A
Other languages
English (en)
French (fr)
Other versions
EP0806258B1 (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 a metal mold, intended in particular for the casting of ferrous metals.
  • the invention finds its application in the metallurgical industry, more particularly in the manufacture of metal parts intended for the automobile industry.
  • metal parts for example cast iron
  • several casting techniques are used, including static casting and centrifugal casting.
  • the metal mold is coated with an insulating coating, based on silica, in the form of a coating with a single or multiple layer.
  • silica products have a high insulating power and are widely used preferably, especially since their cost is low and their availability is high.
  • This slip consists of a suspension of silica flour in water previously added with products capable of improving the rheological properties, in general gelling agents, mineral or organic.
  • the metal mold is coated with a uniform refractory layer.
  • a known improvement in the prior art has therefore consisted in making the coating in several layers, a first layer (or primary coating), applied directly to the surface of the mold and intended to remain there permanently, and a second layer (or secondary coating), applied to the previous layer and renewed totally or partially at each casting operation.
  • the invention therefore aims to eliminate any use of silica products as an insulating coating for metal molds, and to replace it with a non-silogenic refractory product having sufficient insulating power.
  • an insulating coating for a metal mold intended for the casting of ferrous metals, in particular by centrifugal casting, comprising at least one primary coating applied to the surface of the mold and intended to remain there permanently and a 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 is meant in the remainder of this specification, 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 as to completely eliminate the water of constitution.
  • the secondary and primary coatings consist essentially of metakaolin.
  • This product has the advantage of being refractory, due to its chemical constitution, to being inert, due to the absence of water of constitution, to being insulating, due to its particle size distribution and to being medically neutral, due to a free silica content of less than 0.5%.
  • a suspension of metakoalin powder in water was also produced, with a concentration by weight of between 25 and 35%.
  • a small addition of sodium bentonite can be added, with a concentration by weight of between 0.1 and 1%.
  • the mold, thus coated has been used several times for the casting of cast iron, in order to obtain metal parts, in particular for the automobile industry.
  • the secondary coating after demolding of the metal part, remains adherent in majority to said part, while a minority fraction remains adherent to the primary coating. Between each casting operation, a new layer was applied by spraying to reconstitute the secondary coating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
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
FR9605822A FR2748409B1 (fr) 1996-05-10 1996-05-10 Nouveau revetement isolant pour moule metallique et procede de realisation d'un tel revetement
FR9605822 1996-05-10

Publications (2)

Publication Number Publication Date
EP0806258A1 true EP0806258A1 (de) 1997-11-12
EP0806258B1 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
WO2006063696A1 (de) * 2004-12-16 2006-06-22 Ashland-Südchemie- Kernfest Gmbh Hochisolierende und feuerfeste beschichtungsmassen für giessformen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014055A1 (de) * 1979-01-17 1980-08-06 The Babcock & Wilcox Company Feuerfeste Faserprodukte
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
JPH07215772A (ja) * 1994-02-04 1995-08-15 Towa Taika Kogyo Kk 不定形耐火物組成

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014055A1 (de) * 1979-01-17 1980-08-06 The Babcock & Wilcox Company Feuerfeste Faserprodukte
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
JPH07215772A (ja) * 1994-02-04 1995-08-15 Towa Taika Kogyo Kk 不定形耐火物組成

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9541, Derwent World Patents Index; Class L02, AN 95-317354, XP002024346 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006063696A1 (de) * 2004-12-16 2006-06-22 Ashland-Südchemie- Kernfest Gmbh Hochisolierende und feuerfeste beschichtungsmassen für giessformen
CN100493790C (zh) * 2004-12-16 2009-06-03 阿什兰德-南方化学-中坚有限公司 浆料组合物、包含该浆料组合物的浇铸模及其用途
AU2005315901B2 (en) * 2004-12-16 2011-06-02 Ashland-Suedchemie-Kernfest Gmbh Highly insulating and fireproof coating material for casting moulds
US8088208B2 (en) 2004-12-16 2012-01-03 Ashland-Sudchemie-Kernfest Gmbh Highly insulating and fireproof coating materials for casting moulds
KR101285020B1 (ko) * 2004-12-16 2013-07-10 아쉴란트-쉬트헤미-케른페스트 게엠베하 사이징 조성물, 캐스팅 몰드, 캐스팅 몰드의 생산 방법, 및 캐스팅 몰드의 용도

Also Published As

Publication number Publication date
FR2748409B1 (fr) 1998-07-10
DE69719845T2 (de) 2003-11-13
FR2748409A1 (fr) 1997-11-14
DE69719845D1 (de) 2003-04-24
ES2195095T3 (es) 2003-12-01
EP0806258B1 (de) 2003-03-19

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