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Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics
Author(s) -
Xu Kai,
Chang Keke,
Zhou Xiaobing,
Chen Leilei,
Liu Junwen,
Deng Zixuan,
Huang Feng,
Huang Qing
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17031
Subject(s) - sintering , materials science , silicon carbide , calphad , eutectic system , ceramic , phase diagram , carbide , ternary operation , silicon , phase (matter) , metallurgy , microstructure , chemistry , computer science , organic chemistry , programming language
The Y 3 Si 2 C 2 coating on the silicon carbide (SiC) powders is reported to improve the sintering process, but the relatively high sintering temperature (1600°C) restricts the engineering application. A series of thermodynamic descriptions for the SiC with light rare‐earth elements are desired to develop potential SiC‐RE 3 Si 2 C 2 core‐shell structures as sintering aids with lower temperatures. Coupling the CALPHAD (CALculation of PHAse Diagram) approach and first‐principles calculations, we have investigated the RE‐Si‐C (RE = La, Ce and Pr) systems. In the SiC‐RE 3 Si 2 C 2 core‐shell structures, the RE 3 Si 2 C 2 phases can react with SiC via ternary eutectic reactions at 810°C, 747°C, and 1148°C respectively. The predicted thermal behaviors of the Pr 3 Si 2 C 2 phase were further confirmed by our key experiments. Therefore, our database can be used to predict promising sintering aids and guide the subsequent processes.