Structural silicon nitride materials containing rare earth oxides

Patent · Tue Jan 01 00:00:00 EST 1980

OSTI ID:863719

Andersson, Clarence A ^[1]

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1. Pittsburgh, PA

A ceramic composition suitable for use as a high-temperature structural material, particularly for use in apparatus exposed to oxidizing atmospheres at temperatures of 400 to 1600.degree. C., is found within the triangular area ABCA of the Si.sub.3 N.sub.4 --SiO.sub.2 --M.sub.2 O.sub.3 ternary diagram depicted in FIG. 1. M is selected from the group of Yb, Dy, Er, Sc, and alloys having Yb, Y, Er, or Dy as one component and Sc, Al, Cr, Ti, (Mg +Zr) or (Ni+Zr) as a second component, said alloy having an effective ionic radius less than 0.89 A.

• DOE Contract Number: E(40-1)-5210
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4234343
• OSTI ID: 863719
• Country of Publication: United States
• Language: English

Related Subjects

structural
silicon
nitride
materials
containing
rare
earth
oxides
ceramic
composition
suitable
high-temperature
material
particularly
apparatus
exposed
oxidizing
atmospheres
temperatures
400
1600
degree
found
triangular
abca
-sio
-m
ternary
diagram
depicted
fig
selected
alloys
component
mg
zr
alloy
effective
ionic
radius
89
composition suitable
earth oxides
structural material
materials containing
earth oxide
ceramic composition
silicon nitride
rare earth
oxidizing atmosphere
temperature structural
containing rare
oxidizing atmospheres
ionic radius
nitride material
/501/