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河北工业大学
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In situ synthesis and properties of self-reinforced $$\hbox {Si}_{3} \hbox {N}_{4}\textendash \hbox {SiO}_{2}\textendash \hbox {Al}_{2} \hbox {O}_{3}\textendash \hbox {Y}_{2}\hbox {O}_{3} \ (\hbox {La}_{2}\hbox {O}_{3}$$ ) glass-ceramic composites

Title: In situ synthesis and properties of self-reinforced $$\hbox {Si}_{3} \hbox {N}_{4}\textendash \hbox {SiO}_{2}\textendash \hbox {Al}_{2} \hbox {O}_{3}\textendash \hbox {Y}_{2}\hbox {O}_{3} \ (\hbox {La}_{2}\hbox {O}_{3}$$ ) glass-ceramic composites
Authors: Luo, Zhiwei1 loaswell@163.com
Lu, Anxian1
Han, Lei1
Song, Jun1
Source: Bulletin of Materials Science. Aug2017, Vol. 40 Issue 4, p683-690. 8p.
Document Type: Article
Subject Terms: GLASS-ceramics synthesis
COMPOSITE materials synthesis
PHASE transformations (Physics)
MECHANICAL behavior of materials
MELTING points
Author-Supplied Keywords: Crystallization ; glass-ceramics ; phase transformations ; silicon nitride
Abstract: In-situ-grown $$\upbeta \!\hbox {-Si}_{3}\hbox {N}_{4}$$ -reinforced $$\hbox {SiO}_{2}\textendash \hbox {Al}_{2}\hbox {O}_{3}\textendash \hbox {Y}_{2}\hbox {O}_{3}$$ $$(\hbox {La}_{2}\hbox {O}_{3})$$ self-reinforced glass-ceramic composites were obtained without any $$\upbeta \!\hbox {-Si}_{3}\hbox {N}_{4}$$ seed crystal. These composites with different compositions were prepared in a nitrogen atmosphere for comparison of phase transformation and mechanical properties. The results showed that $$\hbox {SiO}_{2}\textendash \hbox {Al}_{2}\hbox {O}_{3}\textendash \hbox {Y}_{2}\hbox {O}_{3}$$ $$(\hbox {La}_{2}\hbox {O}_{3})$$ glass can effectively promote $$\upalpha $$ - to $$\upbeta \!\hbox {-Si}_{3}\hbox {N}_{4}$$ phase transformation. The crystallized $$\hbox {Y}_{2}\hbox {Si}_{2}\hbox {O}_{7}\textendash \hbox {La}_{4.67}\hbox {Si}_{3}\hbox {O}_{13}$$ phases with a high melting point significantly benefited the high-temperature mechanical properties of the composites. The $$\hbox {Si}_{3}\hbox {N}_{4}\textendash \hbox {SiO}_{2}\textendash \hbox {Al}_{2} \hbox {O}_{3}\textendash \hbox {Y}_{2}\hbox {O}_{3}$$ $$(\hbox {La}_{2}\hbox {O}_{3})$$ glass-ceramic composites exhibit excellent mechanical properties compared with unreinforced glass-ceramic matrix, which is undoubtedly attributed to the elongated $$\upbeta \!\hbox {-Si}_{3}\hbox {N}_{4}$$ grains. These glass-ceramic $$\hbox {Si}_{3}\hbox {N}_{4}$$ composites with excellent comprehensive properties might be a promising material for high-temperature applications. [ABSTRACT FROM AUTHOR]
(Copyright applies to all Abstracts.)
Author Affiliations: 1School of Materials Science and Engineering, Central South University , Changsha 410083 PR China
ISSN: 0250-4707 (Sherpa/RoMEO, JCR)
PageCount: 683-691
volume: 40
issue: 4
issn: 02504707
pubdate: 2017
DOI: https://doi.org/10.1007/s12034-017-1426-9
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