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Ordered coalescence...
Ordered coalescence of nano crystallites contributing to the rapid anisotropic grain growth in silicon nitride ceramics
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- Hu, Jianfeng (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Shen, Zhijian (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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(creator_code:org_t)
- Elsevier BV, 2013
- 2013
- English.
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In: Scripta Materialia. - : Elsevier BV. - 1359-6462 .- 1872-8456. ; 69:3, s. 270-273
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Microstructural characterization is performed on two dense Si3N4 ceramic samples consolidated by spark plasma sintering (SPS): one fabricated using alpha-Si3N4 and the other using beta-Si3N4 as the starting powder. A novel mechanism is revealed where ordered coalescence of nano beta-crystallites accelerate the rapid beta-Si3N4 anisotropic grain growth. The rapid alpha- to beta-Si3N4 phase transformation via a high supersaturation of dissolved Si3N4 in the melt favors this mechanism. The high heating rate by SPS is essential for achieving such supersaturation.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Keyword
- Abnormal grain growth
- Phase transformations
- Interface defects
- Spark plasma sintering
- HREM
- Inorganic Chemistry
- oorganisk kemi
Publication and Content Type
- ref (subject category)
- art (subject category)
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