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Influences of rare‐earth oxide additives on the formation and properties of porous Si 2 N 2 O ceramic
Here we prepared porous silicon oxynitride (Si 2 N 2 O) ceramics by reaction sintering of SiO 2 and Si 3 N 4 using five different rare‐earth oxides ( RE 2 O 3 , RE = Lu, Yb, Y, Sm, and La) as sintering aids. The influences of RE 2 O 3 on the formation, densification, microstructure, and mechanical...
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| Published in: | Journal of the American Ceramic Society 2019-01, Vol.102 (1), p.136-143 |
|---|---|
| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Here we prepared porous silicon oxynitride (Si
2
N
2
O) ceramics by reaction sintering of SiO
2
and Si
3
N
4
using five different rare‐earth oxides (
RE
2
O
3
,
RE
= Lu, Yb, Y, Sm, and La) as sintering aids. The influences of
RE
2
O
3
on the formation, densification, microstructure, and mechanical properties of Si
2
N
2
O ceramics have been investigated in detail. The results have indicated that with the increase in
RE
ionic radius, the formation temperature of Si
2
N
2
O decreases, and the densification process could be promoted by
RE
2
O
3
with larger
RE
3+
ionic radius. In addition, microstructures and mechanical properties are highly dependent on the
RE
2
O
3
additives. With the increase in
RE
3+
ionic radius, Si
2
N
2
O changes from platelike crystals to elongated crystals. The samples doped with La
2
O
3
and Sm
2
O
3
with elongated crystals exhibit higher flexural strength and higher Vickers hardness. |
|---|---|
| ISSN: | 0002-7820 1551-2916 |
| DOI: | 10.1111/jace.15886 |