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

Patent ·
OSTI ID:870557

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
DOE Contract Number:
AC05-84OR21400
Assignee:
Saint-Gobain/Norton Industrial Ceramics Corp. (Worcester, MA)
Patent Number(s):
US 5545597
OSTI ID:
870557
Country of Publication:
United States
Language:
English