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Size-driven phase t...
Size-driven phase transformation and microstructure evolution of ZrO2 nanocrystallites associated with thermal treatments
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- Fu, Le (författare)
- Cent South Univ, Sch Mat Sci & Engn, Changsha, Peoples R China.
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- Li, Bo (författare)
- Cent South Univ, Sch Mat Sci & Engn, Changsha, Peoples R China.
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- Xu, Guofu (författare)
- Cent South Univ, Sch Mat Sci & Engn, Changsha, Peoples R China.
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- Huang, Jiwu (författare)
- Cent South Univ, Sch Mat Sci & Engn, Changsha, Peoples R China.
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- Engqvist, Håkan, 1972- (författare)
- Uppsala universitet,Tillämpad materialvetenskap
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- Xia, Wei, Senior Lecture/Associate Professor (författare)
- Uppsala universitet,Tillämpad materialvetenskap
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Cent South Univ, Sch Mat Sci & Engn, Changsha, Peoples R China Tillämpad materialvetenskap (creator_code:org_t)
- Elsevier, 2021
- 2021
- Engelska.
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Ingår i: Journal of the European Ceramic Society. - : Elsevier. - 0955-2219 .- 1873-619X. ; 41:11, s. 5624-5633
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Thermal stability of nanocrystallites plays an important role in the manufacturing and application of nanocrystalline ceramics/glass-ceramics. This study explores the effects of thermal treatments on the microstructures of two ZrO2-SiO2 nanocrystalline glass-ceramics (NCGCs), an undoped one and a yttria-doped one. The two assintered NCGCs were composed of tetragonal (t) and monoclinic (m) ZrO2 nanocrystallites, and SiO2 component was amorphous. t-ZrO2 and m-ZrO2 nanocrystallites were metastable during thermal treatment. The content of m-ZrO2 in the undoped ZrO2-SiO2 NCGC first increased after thermal treating at 850 degrees C for 5 h, then decreased after thermal treating at and above 950 degrees C. After thermal treating at 1250 degrees C for 5 h, t-ZrO2 nanocrystallites experienced a rapid phase transformation during cooling, resulting the formation of 88.6 vol% m-ZrO2. Sizedriven phase transformation was utilized to explain the metastability of t-ZrO2 and m-ZrO2 nanocrystallites. In contrast, the content of m-ZrO2 in the yttria-doped ZrO2-SiO2 NCGC continuously decreased with the increase of thermal treatment temperature. The addition of yttria improved the phase stability of t-ZrO2 up to at least 1250 degrees C. Crystallite size of both t-ZrO2 and m-ZrO2 nanocrystallites increased with the increase of thermal treatment temperature in the two NCGCs. The presence of residual thermal stress in the as-sintered NCGCs changed the lattice spacing of t-ZrO2 and m-ZrO2 nanocrystallites, and the stress can be released after thermal treatment. Thermal treatment exerts significant influences on the microstructure of ZrO2-SiO2 NCGCs.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Keramteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Ceramics (hsv//eng)
Nyckelord
- Nanocrystalline glass-ceramics
- ZrO2-SiO2
- Thermal treatment
- Size-driven phase transformation
- Crystallite coarsening
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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