Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 4, Pages 2306-2311Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.12.007
Keywords
Abnormal grain growth; Iron-containing SiC fibers; Transmission electron microscopy; Coherent attachment
Categories
Funding
- National Natural Science Foundation of China [50532010, 51302234, 51701170, 51871058]
- project of science and technology plan of Fujian Province [2018J01520]
- talented youth scientist support program of Fujian province
- Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory (China) [6142911040113]
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Iron-rich particles play a crucial role in the rapid grain growth of SiC fibers during sintering by facilitating coherent attachment of grains and using neighboring irregular-shaped nanograins as building blocks. This growth mechanism introduces structural heterogeneities, including the formation of low angle grain boundaries and porosities.
Understanding the role of sintering aids during microstructure evolution is critical to the manufacture of densified SiC fibers. A variety of TEM characterization techniques are combined to investigate grain growth behavior in iron-doped SiC fibers. Ultra-large SiC grains in micron size, as the self-assembly of nano sub-grains into a similar orientation, were consistently discovered at the surface and indicative of abnormal grain growth. The growth front consisted of polycrystalline nanograins wetted by iron-rich particles, where several sub-grains were found to unify their (111) planes with a misorientation angle less than 10 degrees, indicating grain rotation at the growth front. It is proposed that iron-rich particles form a quasi-liquid interfacial phase during sintering, which facilitates coherent attachment of grains and results in fast grain growth using neighboring irregular-shaped nanograins as building blocks. The imperfect ordered coalescence of nanograins introduces structural hetero-geneities, including low angle grain boundaries and porosities.
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