Silicon nitride ceramic and cutting tool made thereof

Details Silicon nitride ceramic and cutting tool made thereof Silicon nitride ceramic and cutting tool made thereof

C - Chemistry, Metallurgy

04

B

C04B 35/596 (2006.01) B23C 5/20 (2006.01) C04B 35/593 (2006.01)

Patent

CA 2149658

Provided is a silicon nitride based ceramic which is particularly useful for use as a cutting tool (10) in the high spend chip forming machining of metallic materials. The ceramic is preferably composed of at least 85 volume percent (v/o) beta silicon nitride phase and less than about 5 v/o intergranular phase. The ceramic has greater than 0.2 weight percent (w/o) magnesia, greater than 0.2 w/o yttria, where the sum of magnesia and yttria is less than 5 w/o. The ceramic has less than 0.2 v/o porosity. The tool (10) has a race face (30) joined to flank faces (50) by cutting edges (70).

L'invention se rapporte à une céramique à base de nitrure de silicium que l'on peut notamment utiliser comme outil coupant (10) dans le façonnage par enlèvement de copeaux à grande vitesse de matériaux métalliques. La céramique se compose de préférence d'au moins 85 pour cent en volume (v/o) d'une phase de nitrure de silicium bêta et de moins d'environ 5 pour cent en volume (v/o) de phase intergranulaire. La céramique possède plus de 0,2 pour cent en poids (w/o) de magnésie, plus de 0,2 pour cent en poids (w/o) d'yttria, la somme de la magnésie et de l'yttria étant inférieure à 5 w/o. La céramique possède moins de 0,2 v/o de porosité. L'outil (10) possède une face d'inclinaison (30) réunie aux faces de dépouille (50) par les bords coupants (70).

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