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alpha ' phase stability in Nd-Li-sialon systems
Seeber, A. J. and Cheng, Y. B. (2003) alpha ' phase stability in Nd-Li-sialon systems. Journal of The European Ceramic Society, 23 7: 1083-1092.
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| Author(s) |
Seeber, A. J.
Cheng, Y. B.
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| Title |
alpha ' phase stability in Nd-Li-sialon systems
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| Journal name |
Journal of The European Ceramic Society
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| Publication date |
2003
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| Volume number |
23
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| Issue number |
7
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| ISSN |
0955-2219
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| Start page |
1083
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| End page |
1092
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| Total pages |
10
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| Place of publication |
Barking, Essex, England
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| Publisher |
Elsevier Science Publishers
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| Language |
eng
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| Subject |
04 Earth Sciences
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| Abstract |
The formability and stability of the alpha-sialon (alpha') phase was investigated in multi-cation Nd-Li-sialon systems. Four samples were prepared, ranging from a pure Nd-sialon to a pure Li-sialon, with two intermediate samples being prepared with either lithium or neodymium replacing the other alpha'-stabilising additive by 20 eq.%, as to maintain an equivalent design composition in all samples. After sintering, all samples were subsequently heat treated up to 192 h at 1450 and 1300 degreesC. While significant quantities of the beta'-sialon (beta' phase were found in most samples, the high-lithium Li-Nd-sialon sample was found to be almost pure a' phase after sintering. Furthermore, the long-term stability of the a' phase on heat treatment was also found to be superior in both multi-cation samples than in either of the single-alpha'-stabilising-cation samples. This is thought to be related to improved retention of the lithium in the multi-cation systems, as much of the lithium was found to volatilise during sintering in the neodymium-free sample. (C) 2002 Elsevier Science Ltd. All rights reserved.
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| Keyword(s) |
Materials Science, Ceramics
Microstructure-final
Sialons
X-ray Methods
Thermal-stability
Mechanical-properties
Heat-treatment
Beta-sialon
Reaction Densification
Formation Behavior
Ceramics
Transformation
Alpha'-sialon
Calcium
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