Journal
SCRIPTA MATERIALIA
Volume 216, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114762
Keywords
YBCO ceramics; Microwave heating; Inhomogeneity; Synchrotron radiation computed tomography
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Funding
- National Natural Science Foundation of China [11872196, 11627901]
- Major Program of the Na-tional Science Foundation of China [11890683]
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In this study, the microstructure evolution and heterogeneous heating phenomenon of YBCO ceramics during microwave heating were investigated using in situ observation and computational modeling. The results reveal the non-uniform distribution of the focused electric field caused by the high conductivity and aggregated-particles of YBCO, leading to local melting and thermal runaway inside the particles.
In this letter, in situ investigation on the microstructure evolution of YBa2Cu3O7-x (YBCO) ceramics with a high electrical conductivity on a microscopic scale during microwave heating was carried out by the synchrotron radiation computed tomography technique. The experimental results indicate that the local melting exist inside the particle composed of smaller particles, leading to the heterogeneous heating or thermal runaway, which has not been reported elsewhere. Subsequently, considering the conductivity and morphology of YBCO particles, the novel phenomena has been interpreted by the calculated results from a constructed model, and it reveals that the non-uniform distribution of the focused electric field stems from the high conductivity and aggregated-particles of YBCO. Moreover, the high conductivity in combination with more and smaller aggregated-particles will intensify the non-uniformity of the focused electric field and heterogeneous heating for different microstructures.
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