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Stress-rupture resistant sintered silicon nitride

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.

Patent Information

NumberUS  5494866
CountryUS
StatusIssued
Date02/27/1996


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