Stress-rupture resistant sintered silicon nitride

Details Stress-rupture resistant sintered silicon nitride Stress-rupture resistant sintered silicon nitride

1994-06-09

1996-02-27

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 92, 501 98, C04B 35584

Patent

active

054948665

ABSTRACT:
A silicon nitride sintered body has a composition consisting essentially of from 75 to 96 wt % of silicon nitride; yttrium oxide present in an amount ranging from about 2 to 10 wt %; at least one oxide of the Lanthanide (Ln) element, wherein the molar ratio of Ln to Y is smaller than 1; strontium oxide present in an amount wherein the molar ratio of Sr to the sum of Y and Ln is between 0.1 and 0.5; and 0.2 to 5 wt % of silicon carbide. Such a ceramic has high strength, high toughness and long term durability, and is especially suited for industrial applications such as components for gas turbine and automotive engines.

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