C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/583 (2006.01) B22D 11/06 (2006.01) C04B 35/58 (2006.01) C04B 35/581 (2006.01)
Patent
CA 2351604
The present invention provides a composite pressure-sintered material comprising a continuous phase of hexagonal boron nitride and, dispersed therein, a second material comprising (a) at least one metal nitride selected from the group consisting of silicon, aluminium and titanium nitrides and (b) at least one stable metal oxide; wherein the amount of metal oxide is such that the second material does not contain more than 35% by weight of oxygen. It has been observed that this material possesses a low thermal expansion coefficient and therefore reveals good thermal shock resistance. Another characteristic of this material is its low wettability by molten steel which is thus responsible for excellent chemical resistance to liquid metal. Finally, this material is exceptionally mechanical wear resistant.
L'invention porte sur un matériau composite fritté sous pression comportant une phase continue de nitrure hexagonal de bore dans laquelle est dispersé un deuxième matériau consistant en (a) un nitrure métallique, de silicium, d'aluminium ou de titane, et (b) au moins un oxyde métallique stable ne comportant pas plus de 35 % en poids d'oxygène. Il s'est avéré que le susdit matériau présente un faible coefficient de dilatation thermique et de ce fait une bonne résistance aux chocs thermiques, et se caractérise en outre par sa faible mouillabilité par l'acier fondu qui lui confère une excellente résistance au métal liquide, et par sa résistance exceptionnelle à l'usure mécanique.
Guillo Philippe
Hoggard Dale B.
Robic
Vesuvius Crucible Company
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