Silicon nitride based ceramics and method

Details Silicon nitride based ceramics and method Silicon nitride based ceramics and method

1985-09-27

1986-07-29

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

264 65, C04B 3558

Patent

active

046031162

ABSTRACT:
A method of preparing fully dense silicon nitride based ceramic articles comprises the steps of blending a metal oxide component and silicon nitride, wherein a portion of the silicon nitride comprises acicular crystals; comminuting the powder mixture to reduce the aspect ratio of the acicular crystals to an average of less than about 3; pressing the comminuted powder to form a compact; and pressureless sintering the compact to a fully dense ceramic body. Powder mixtures and powder compacts for forming fully dense silicon nitride based ceramic bodies are also disclosed.

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