Firmly adhering silicon nitride-containing release layer

Details Firmly adhering silicon nitride-containing release layer Firmly adhering silicon nitride-containing release layer

C - Chemistry, Metallurgy

04

B

C04B 35/587 (2006.01) B22D 41/02 (2006.01) C03C 17/22 (2006.01) C04B 41/50 (2006.01) C04B 41/87 (2006.01) C23C 20/08 (2006.01) C30B 11/00 (2006.01) C30B 15/10 (2006.01)

Patent

CA 2702380

The invention relates to a slip for producing a durable, firmly adhering barrier layer on a substrate, comprising a suspension of solid particles, wherein the solid particles comprise 67-95% by weight of silicon nitride and 5-33% by weight of an SiO2-based high--temperature binder and the SiO2-based high-temperature binder is derived from Si02 precursors and has been pretreated by heat treatment in a temperature range of 300-1300°C. The invention further provides shaped bodies comprising a substrate having a durable, firmly adhering barrier layer and also processes for producing them. The shaped bodies of the invention are suitable for use in the field of corrosive nonferrous metal melts.

L'invention concerne un enduit pour la fabrication d'une couche de séparation fortement adhésive et durable sur un substrat, cet enduit comprenant une suspension de particules solides. Selon l'invention, les particules solides comprennent 67 à 95 % en poids de nitrure de silicium et 5 à 33 % en poids d'un liant haute température à base de SiO2, ledit liant haute température à base de SiO2 étant dérivé de précurseurs à base de SiO2 et étant prétraité par traitement thermique dans une plage de températures de 300 à 1 300 °C. L'invention concerne également des corps moulés à partir d'un substrat muni d'une couche de séparation fortement adhésive et durable, ainsi que leurs procédés de fabrication. Les corps moulés selon l'invention s'utilisent dans le domaine des métaux fondus non ferreux corrosifs.

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