High-strength, high-toughness silicon nitride sinter

Details High-strength, high-toughness silicon nitride sinter High-strength, high-toughness silicon nitride sinter

1996-12-06

1998-01-06

Gruop, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 972, C04B 35587

Patent

active

057054495

ABSTRACT:
A method for the production of a high-strength high-toughness silicon nitride sinter includes the steps of mixing a silicon nitride powder with a sintering additive, adding to the resultant mixture as seed particles 0.1 to 10% by volume, based on the amount of the mixture, of elongated single crystal .beta.-silicon nitride particles having a larger minor diameter than the average particle diameter of the silicon nitride powder and having an aspect ratio of at least 2, forming the resultant mixture so as to orient the elongated single crystal .beta.-silicon nitride particles as seed particles in a specific direction, and heating the green body to density it and simultaneously induce epitaxial growth of single crystal .beta.-silicon nitride particles, and a high-strength, high-toughness silicon nitride sinter obtained by the method.

REFERENCES:
patent: 4994219 (1991-02-01), Yeh
patent: 5171723 (1992-12-01), Moriguchi et al.
patent: 5401450 (1995-03-01), Mitomo et al.
patent: 5545597 (1996-08-01), Yeckley

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