Method for producing a high-strength, high-toughness silicon nit

Details Method for producing a high-strength, high-toughness silicon nit Method for producing a high-strength, high-toughness silicon nit

1995-09-18

1997-10-07

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

264 56, C04B 35587

Patent

active

056747934

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.

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Eiji Tani et al., Gas-Pressure Sintering of Si.sub.3 N.sub.4 with Concurrent Addition of Al.sub.2 O.sub.3 and 5 WT% Rare Earth Oxide: High Fracture Toughness Si.sub.3 N.sub.4 with Fiber-Like Structure; Ceramic Bulletin in vol. 65, No. 9 pp. 1311-15 (1986) no month.
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