Microstructure of silicon nitride ceramics sintered with rare-earth oxides
Journal Article
·
· Acta Metallurgica et Materialia
- Lawrence Berkeley Lab., CA (United States). National Center for Electron Microscopy
- Univ. of California, Berkeley, CA (United States). Dept. of Materials Science
Microstructures of Si{sub 3}N{sub 4} with crystallized grain boundaries of rare-earth silicates were investigated. {beta}-Si{sub 3}N{sub 4} grains in samples sintered with Yb{sub 2}O{sub 3} were more elongated than those sintered with Dy{sub 2}O{sub 3}. Amorphous thin layers between crystallized grain boundaries of silicate and Si{sub 3}N{sub 4} grains were recognized for both specimens sintered with Dy{sub 2}O{sub 3} and with Yb{sub 2}O{sub 3}. In the sample sintered with Dy{sub 2}O{sub 3}, very clean grain boundaries between Si{sub 3}N{sub 4} grains which did not contain the heavy elements were frequently recognized, while samples with Yb{sub 2}O{sub 3} had an amorphous grain boundary phase containing Yb. Unusual structures with distorted lattice images in regions rich in Si and O were discovered in crystalline Dy-silicate phases.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 31712
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 3 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Design, microstructure, and high-temperature behavior of silicon nitride sintered with rate-earth oxides
Silicon nitride joining using rare-earth reaction sintering
Silicon nitride containing rare earth silicate intergranular phases
Technical Report
·
Thu Aug 01 00:00:00 EDT 1991
·
OSTI ID:5206386
Silicon nitride joining using rare-earth reaction sintering
Journal Article
·
Fri Feb 14 23:00:00 EST 1997
· Scripta Materialia
·
OSTI ID:438629
Silicon nitride containing rare earth silicate intergranular phases
Conference
·
Wed Dec 30 23:00:00 EST 1992
·
OSTI ID:10125876