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Title: Silicon nitride ceramic having high fatigue life and high toughness

A sintered silicon nitride ceramic comprising between about 0.6 mol % and about 3.2 mol % rare earth as rare earth oxide, and between about 85 w/o and about 95 w/o beta silicon nitride grains, wherein at least about 20% of the beta silicon nitride grains have a thickness of greater than about 1 micron.
Inventors:
 [1]
  1. (Oakham, MA)
Issue Date:
OSTI Identifier:
870557
Assignee:
Saint-Gobain/Norton Industrial Ceramics Corp. (Worcester, MA) ORNL
Patent Number(s):
US 5545597
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
silicon; nitride; ceramic; fatigue; life; toughness; sintered; comprising; mol; rare; earth; oxide; 85; 95; beta; grains; 20; thickness; micron; ceramic comprising; earth oxide; silicon nitride; rare earth; beta silicon; nitride ceramic; sintered silicon; fatigue life; nitride grain; /501/